* [PATCH 00/43] semihosting cleanup
@ 2022-04-30 13:28 Richard Henderson
2022-04-30 13:28 ` [PATCH 01/43] semihosting: Move exec/softmmu-semi.h to semihosting/softmmu-uaccess.h Richard Henderson
` (43 more replies)
0 siblings, 44 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:28 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
I had whipped up an rx-elf cross toolchain to test something
recently, and since I had built it, thought it would be easy
to use libgloss to run the multiarch hello and memory tests.
But we haven't implemented libgloss-style semihosting for rx.
I had forgotten how much boilerplate there is currently for
implementing semihosting for an architecture. And we have 3
implementations that really could share much more code.
So: split out semihosting syscalls to individual functions,
and allow them to be wired up with a minimum of fuss. Fix a
few bugs and to-do items on the way.
Still to do:
* Merge semihosting console.c into GuestFD.
The ARM semihosting spec has separate syscalls for console output,
and expects the read/write syscalls to only apply to files.
But the other semihosting implementations assume stdin/stdout,
and we should be able to wire those up via the same mechanism.
* Errno. The ARM spec punts this entirely. But we aren't even
self-consistant, some paths returning host <errno.h> values,
and anything going through gdbstub using the gdb remote
file-io errno values. The arm and nios2 specs explicitly
call for the gdb values, which we are not doing.
* tests/tcg/m68k semihosting implementation.
* target/rx semihosting implementation.
r~
Richard Henderson (43):
semihosting: Move exec/softmmu-semi.h to semihosting/softmmu-uaccess.h
semihosting: Return failure from softmmu-uaccess.h functions
semihosting: Improve condition for config.c and console.c
semihosting: Move softmmu-uaccess functions out of line
semihosting: Add target_strlen for softmmu-uaccess.h
semihosting: Simplify softmmu_lock_user_string
semihosting: Split out guestfd.c
semihosting: Generalize GuestFDFeatureFile
semihosting: Return void from do_common_semihosting
semihosting: Adjust error checking in common_semi_cb
semihosting: Move common-semi.h to include/semihosting/
include/exec: Move gdb open flags to gdbstub.h
include/exec: Move gdb_stat and gdb_timeval to gdbstub.h
semihosting: Use struct gdb_stat in common_semi_flen_cb
semihosting: Split is_64bit_semihosting per target
semihosting: Split common_semi_flen_buf per target
semihosting: Split out common_semi_has_synccache
semihosting: Use env more often in do_common_semihosting
semihosting: Move GET_ARG/SET_ARG earlier in the file
semihosting: Split out semihost_sys_open
semihosting: Split out semihost_sys_close
semihosting: Split out semihost_sys_read
semihosting: Split out semihost_sys_write
semihosting: Bound length for semihost_sys_{read,write}
semihosting: Split out semihost_sys_lseek
semihosting: Split out semihost_sys_isatty
semihosting: Split out semihost_sys_flen
semihosting: Split out semihost_sys_remove
semihosting: Split out semihost_sys_rename
semihosting: Split out semihost_sys_system
semihosting: Create semihost_sys_{stat,fstat}
semihosting: Create semihost_sys_gettimeofday
gdbstub: Widen gdb_syscall_complete_cb return value
target/m68k: Eliminate m68k_semi_is_fseek
target/m68k: Make semihosting system only
target/m68k: Use guestfd.h to implement syscalls.
target/m68k: Do semihosting call as a normal helper
target/m68k: Enable semihosting for non-coldfire
target/m68k: Remove EXCP_HALT_INSN
target/nios2: Eliminate nios2_semi_is_lseek
target/nios2: Move nios2-semi.c to nios2_softmmu_ss
target/nios2: Use guestfd.h to implement syscalls.
target/nios2: Do semihosting call as a normal helper
configs/targets/aarch64-linux-user.mak | 1 +
configs/targets/aarch64_be-linux-user.mak | 1 +
configs/targets/arm-linux-user.mak | 1 +
configs/targets/armeb-linux-user.mak | 1 +
configs/targets/riscv32-linux-user.mak | 1 +
configs/targets/riscv64-linux-user.mak | 1 +
include/exec/gdbstub.h | 43 +-
include/exec/softmmu-semi.h | 101 --
.../semihosting}/common-semi.h | 2 +-
include/semihosting/guestfd.h | 95 ++
include/semihosting/softmmu-uaccess.h | 59 ++
target/arm/common-semi-target.h | 62 ++
target/m68k/cpu.h | 3 -
target/m68k/helper.h | 1 +
target/nios2/cpu.h | 3 -
target/nios2/helper.h | 1 +
target/riscv/common-semi-target.h | 50 +
gdbstub.c | 7 +-
linux-user/aarch64/cpu_loop.c | 2 +-
linux-user/arm/cpu_loop.c | 2 +-
linux-user/m68k/cpu_loop.c | 5 -
linux-user/riscv/cpu_loop.c | 2 +-
semihosting/arm-compat-semi.c | 955 ++++--------------
semihosting/console.c | 7 +-
semihosting/guestfd.c | 935 +++++++++++++++++
semihosting/uaccess.c | 71 ++
target/arm/helper.c | 4 +-
target/arm/m_helper.c | 2 +-
target/m68k/m68k-semi.c | 374 +------
target/m68k/op_helper.c | 15 -
target/m68k/translate.c | 38 +-
target/mips/tcg/sysemu/mips-semi.c | 2 +-
target/nios2/helper.c | 7 -
target/nios2/nios2-semi.c | 357 +------
target/nios2/translate.c | 2 +-
target/riscv/cpu_helper.c | 2 +-
semihosting/meson.build | 5 +
target/m68k/meson.build | 6 +-
target/nios2/meson.build | 4 +-
39 files changed, 1686 insertions(+), 1544 deletions(-)
delete mode 100644 include/exec/softmmu-semi.h
rename {semihosting => include/semihosting}/common-semi.h (96%)
create mode 100644 include/semihosting/guestfd.h
create mode 100644 include/semihosting/softmmu-uaccess.h
create mode 100644 target/arm/common-semi-target.h
create mode 100644 target/riscv/common-semi-target.h
create mode 100644 semihosting/guestfd.c
create mode 100644 semihosting/uaccess.c
--
2.34.1
^ permalink raw reply [flat|nested] 45+ messages in thread
* [PATCH 01/43] semihosting: Move exec/softmmu-semi.h to semihosting/softmmu-uaccess.h
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
@ 2022-04-30 13:28 ` Richard Henderson
2022-04-30 13:28 ` [PATCH 02/43] semihosting: Return failure from softmmu-uaccess.h functions Richard Henderson
` (42 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:28 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
We have a subdirectory for semihosting; move this file out of exec.
Rename to emphasize the contents are a replacement for the functions
in linux-user/bsd-user uaccess.c.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
.../{exec/softmmu-semi.h => semihosting/softmmu-uaccess.h} | 6 +++---
semihosting/arm-compat-semi.c | 2 +-
target/m68k/m68k-semi.c | 2 +-
target/mips/tcg/sysemu/mips-semi.c | 2 +-
target/nios2/nios2-semi.c | 2 +-
5 files changed, 7 insertions(+), 7 deletions(-)
rename include/{exec/softmmu-semi.h => semihosting/softmmu-uaccess.h} (95%)
diff --git a/include/exec/softmmu-semi.h b/include/semihosting/softmmu-uaccess.h
similarity index 95%
rename from include/exec/softmmu-semi.h
rename to include/semihosting/softmmu-uaccess.h
index fbcae88f4b..e69e3c8548 100644
--- a/include/exec/softmmu-semi.h
+++ b/include/semihosting/softmmu-uaccess.h
@@ -7,8 +7,8 @@
* This code is licensed under the GPL
*/
-#ifndef SOFTMMU_SEMI_H
-#define SOFTMMU_SEMI_H
+#ifndef SEMIHOSTING_SOFTMMU_UACCESS_H
+#define SEMIHOSTING_SOFTMMU_UACCESS_H
#include "cpu.h"
@@ -98,4 +98,4 @@ static void softmmu_unlock_user(CPUArchState *env, void *p, target_ulong addr,
}
#define unlock_user(s, args, len) softmmu_unlock_user(env, s, args, len)
-#endif
+#endif /* SEMIHOSTING_SOFTMMU_UACCESS_H */
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index 7a51fd0737..dbef280b87 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -370,7 +370,7 @@ static GuestFD *get_guestfd(int guestfd)
#ifndef CONFIG_USER_ONLY
static target_ulong syscall_err;
-#include "exec/softmmu-semi.h"
+#include "semihosting/softmmu-uaccess.h"
#endif
static inline uint32_t set_swi_errno(CPUState *cs, uint32_t code)
diff --git a/target/m68k/m68k-semi.c b/target/m68k/m68k-semi.c
index 37343d47e2..a31db38fc3 100644
--- a/target/m68k/m68k-semi.c
+++ b/target/m68k/m68k-semi.c
@@ -25,7 +25,7 @@
#include "qemu.h"
#define SEMIHOSTING_HEAP_SIZE (128 * 1024 * 1024)
#else
-#include "exec/softmmu-semi.h"
+#include "semihosting/softmmu-uaccess.h"
#include "hw/boards.h"
#endif
#include "qemu/log.h"
diff --git a/target/mips/tcg/sysemu/mips-semi.c b/target/mips/tcg/sysemu/mips-semi.c
index b4a383ae90..6d6296e709 100644
--- a/target/mips/tcg/sysemu/mips-semi.c
+++ b/target/mips/tcg/sysemu/mips-semi.c
@@ -21,7 +21,7 @@
#include "cpu.h"
#include "qemu/log.h"
#include "exec/helper-proto.h"
-#include "exec/softmmu-semi.h"
+#include "semihosting/softmmu-uaccess.h"
#include "semihosting/semihost.h"
#include "semihosting/console.h"
diff --git a/target/nios2/nios2-semi.c b/target/nios2/nios2-semi.c
index ec88474a73..373e6b9436 100644
--- a/target/nios2/nios2-semi.c
+++ b/target/nios2/nios2-semi.c
@@ -28,7 +28,7 @@
#if defined(CONFIG_USER_ONLY)
#include "qemu.h"
#else
-#include "exec/softmmu-semi.h"
+#include "semihosting/softmmu-uaccess.h"
#endif
#include "qemu/log.h"
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 02/43] semihosting: Return failure from softmmu-uaccess.h functions
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
2022-04-30 13:28 ` [PATCH 01/43] semihosting: Move exec/softmmu-semi.h to semihosting/softmmu-uaccess.h Richard Henderson
@ 2022-04-30 13:28 ` Richard Henderson
2022-04-30 13:28 ` [PATCH 03/43] semihosting: Improve condition for config.c and console.c Richard Henderson
` (41 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:28 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
We were reporting unconditional success for these functions;
pass on any failure from cpu_memory_rw_debug.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
include/semihosting/softmmu-uaccess.h | 91 ++++++++++++---------------
1 file changed, 39 insertions(+), 52 deletions(-)
diff --git a/include/semihosting/softmmu-uaccess.h b/include/semihosting/softmmu-uaccess.h
index e69e3c8548..5246a91570 100644
--- a/include/semihosting/softmmu-uaccess.h
+++ b/include/semihosting/softmmu-uaccess.h
@@ -12,82 +12,69 @@
#include "cpu.h"
-static inline uint64_t softmmu_tget64(CPUArchState *env, target_ulong addr)
-{
- uint64_t val;
+#define get_user_u64(val, addr) \
+ ({ uint64_t val_ = 0; \
+ int ret_ = cpu_memory_rw_debug(env_cpu(env), (addr), \
+ &val_, sizeof(val_), 0); \
+ (val) = tswap64(val_); ret_; })
- cpu_memory_rw_debug(env_cpu(env), addr, (uint8_t *)&val, 8, 0);
- return tswap64(val);
-}
+#define get_user_u32(val, addr) \
+ ({ uint32_t val_ = 0; \
+ int ret_ = cpu_memory_rw_debug(env_cpu(env), (addr), \
+ &val_, sizeof(val_), 0); \
+ (val) = tswap32(val_); ret_; })
-static inline uint32_t softmmu_tget32(CPUArchState *env, target_ulong addr)
-{
- uint32_t val;
+#define get_user_u8(val, addr) \
+ ({ uint8_t val_ = 0; \
+ int ret_ = cpu_memory_rw_debug(env_cpu(env), (addr), \
+ &val_, sizeof(val_), 0); \
+ (val) = val_; ret_; })
- cpu_memory_rw_debug(env_cpu(env), addr, (uint8_t *)&val, 4, 0);
- return tswap32(val);
-}
-
-static inline uint32_t softmmu_tget8(CPUArchState *env, target_ulong addr)
-{
- uint8_t val;
-
- cpu_memory_rw_debug(env_cpu(env), addr, &val, 1, 0);
- return val;
-}
-
-#define get_user_u64(arg, p) ({ arg = softmmu_tget64(env, p); 0; })
-#define get_user_u32(arg, p) ({ arg = softmmu_tget32(env, p) ; 0; })
-#define get_user_u8(arg, p) ({ arg = softmmu_tget8(env, p) ; 0; })
#define get_user_ual(arg, p) get_user_u32(arg, p)
-static inline void softmmu_tput64(CPUArchState *env,
- target_ulong addr, uint64_t val)
-{
- val = tswap64(val);
- cpu_memory_rw_debug(env_cpu(env), addr, (uint8_t *)&val, 8, 1);
-}
+#define put_user_u64(val, addr) \
+ ({ uint64_t val_ = tswap64(val); \
+ cpu_memory_rw_debug(env_cpu(env), (addr), &val_, sizeof(val_), 1); })
+
+#define put_user_u32(val, addr) \
+ ({ uint32_t val_ = tswap32(val); \
+ cpu_memory_rw_debug(env_cpu(env), (addr), &val_, sizeof(val_), 1); })
-static inline void softmmu_tput32(CPUArchState *env,
- target_ulong addr, uint32_t val)
-{
- val = tswap32(val);
- cpu_memory_rw_debug(env_cpu(env), addr, (uint8_t *)&val, 4, 1);
-}
-#define put_user_u64(arg, p) ({ softmmu_tput64(env, p, arg) ; 0; })
-#define put_user_u32(arg, p) ({ softmmu_tput32(env, p, arg) ; 0; })
#define put_user_ual(arg, p) put_user_u32(arg, p)
-static void *softmmu_lock_user(CPUArchState *env,
- target_ulong addr, target_ulong len, int copy)
+static void *softmmu_lock_user(CPUArchState *env, target_ulong addr,
+ target_ulong len, bool copy)
{
- uint8_t *p;
- /* TODO: Make this something that isn't fixed size. */
- p = malloc(len);
+ void *p = malloc(len);
if (p && copy) {
- cpu_memory_rw_debug(env_cpu(env), addr, p, len, 0);
+ if (cpu_memory_rw_debug(env_cpu(env), addr, p, len, 0)) {
+ free(p);
+ p = NULL;
+ }
}
return p;
}
#define lock_user(type, p, len, copy) softmmu_lock_user(env, p, len, copy)
+
static char *softmmu_lock_user_string(CPUArchState *env, target_ulong addr)
{
- char *p;
- char *s;
- uint8_t c;
/* TODO: Make this something that isn't fixed size. */
- s = p = malloc(1024);
+ char *s = malloc(1024);
+ size_t len = 0;
+
if (!s) {
return NULL;
}
do {
- cpu_memory_rw_debug(env_cpu(env), addr, &c, 1, 0);
- addr++;
- *(p++) = c;
- } while (c);
+ if (cpu_memory_rw_debug(env_cpu(env), addr++, s + len, 1, 0)) {
+ free(s);
+ return NULL;
+ }
+ } while (s[len++]);
return s;
}
#define lock_user_string(p) softmmu_lock_user_string(env, p)
+
static void softmmu_unlock_user(CPUArchState *env, void *p, target_ulong addr,
target_ulong len)
{
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 03/43] semihosting: Improve condition for config.c and console.c
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
2022-04-30 13:28 ` [PATCH 01/43] semihosting: Move exec/softmmu-semi.h to semihosting/softmmu-uaccess.h Richard Henderson
2022-04-30 13:28 ` [PATCH 02/43] semihosting: Return failure from softmmu-uaccess.h functions Richard Henderson
@ 2022-04-30 13:28 ` Richard Henderson
2022-04-30 13:28 ` [PATCH 04/43] semihosting: Move softmmu-uaccess functions out of line Richard Henderson
` (40 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:28 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
While CONFIG_SEMIHOSTING is currently only set for softmmu,
this will not continue to be true.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
semihosting/meson.build | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/semihosting/meson.build b/semihosting/meson.build
index ea8090abe3..4344e43fb9 100644
--- a/semihosting/meson.build
+++ b/semihosting/meson.build
@@ -1,4 +1,4 @@
-specific_ss.add(when: 'CONFIG_SEMIHOSTING', if_true: files(
+specific_ss.add(when: ['CONFIG_SEMIHOSTING', 'CONFIG_SOFTMMU'], if_true: files(
'config.c',
'console.c',
))
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 04/43] semihosting: Move softmmu-uaccess functions out of line
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (2 preceding siblings ...)
2022-04-30 13:28 ` [PATCH 03/43] semihosting: Improve condition for config.c and console.c Richard Henderson
@ 2022-04-30 13:28 ` Richard Henderson
2022-04-30 13:28 ` [PATCH 05/43] semihosting: Add target_strlen for softmmu-uaccess.h Richard Henderson
` (39 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:28 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
Rather that static (and not even inline) functions within a
header, move the functions to semihosting/uaccess.c.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
include/semihosting/softmmu-uaccess.h | 42 +++-------------------
semihosting/uaccess.c | 51 +++++++++++++++++++++++++++
semihosting/meson.build | 1 +
3 files changed, 57 insertions(+), 37 deletions(-)
create mode 100644 semihosting/uaccess.c
diff --git a/include/semihosting/softmmu-uaccess.h b/include/semihosting/softmmu-uaccess.h
index 5246a91570..03300376d3 100644
--- a/include/semihosting/softmmu-uaccess.h
+++ b/include/semihosting/softmmu-uaccess.h
@@ -42,47 +42,15 @@
#define put_user_ual(arg, p) put_user_u32(arg, p)
-static void *softmmu_lock_user(CPUArchState *env, target_ulong addr,
- target_ulong len, bool copy)
-{
- void *p = malloc(len);
- if (p && copy) {
- if (cpu_memory_rw_debug(env_cpu(env), addr, p, len, 0)) {
- free(p);
- p = NULL;
- }
- }
- return p;
-}
+void *softmmu_lock_user(CPUArchState *env, target_ulong addr,
+ target_ulong len, bool copy);
#define lock_user(type, p, len, copy) softmmu_lock_user(env, p, len, copy)
-static char *softmmu_lock_user_string(CPUArchState *env, target_ulong addr)
-{
- /* TODO: Make this something that isn't fixed size. */
- char *s = malloc(1024);
- size_t len = 0;
-
- if (!s) {
- return NULL;
- }
- do {
- if (cpu_memory_rw_debug(env_cpu(env), addr++, s + len, 1, 0)) {
- free(s);
- return NULL;
- }
- } while (s[len++]);
- return s;
-}
+char *softmmu_lock_user_string(CPUArchState *env, target_ulong addr);
#define lock_user_string(p) softmmu_lock_user_string(env, p)
-static void softmmu_unlock_user(CPUArchState *env, void *p, target_ulong addr,
- target_ulong len)
-{
- if (len) {
- cpu_memory_rw_debug(env_cpu(env), addr, p, len, 1);
- }
- free(p);
-}
+void softmmu_unlock_user(CPUArchState *env, void *p,
+ target_ulong addr, target_ulong len);
#define unlock_user(s, args, len) softmmu_unlock_user(env, s, args, len)
#endif /* SEMIHOSTING_SOFTMMU_UACCESS_H */
diff --git a/semihosting/uaccess.c b/semihosting/uaccess.c
new file mode 100644
index 0000000000..0d3b32b75d
--- /dev/null
+++ b/semihosting/uaccess.c
@@ -0,0 +1,51 @@
+/*
+ * Helper routines to provide target memory access for semihosting
+ * syscalls in system emulation mode.
+ *
+ * Copyright (c) 2007 CodeSourcery.
+ *
+ * This code is licensed under the GPL
+ */
+
+#include "qemu/osdep.h"
+#include "semihosting/softmmu-uaccess.h"
+
+void *softmmu_lock_user(CPUArchState *env, target_ulong addr,
+ target_ulong len, bool copy)
+{
+ void *p = malloc(len);
+ if (p && copy) {
+ if (cpu_memory_rw_debug(env_cpu(env), addr, p, len, 0)) {
+ free(p);
+ p = NULL;
+ }
+ }
+ return p;
+}
+
+char *softmmu_lock_user_string(CPUArchState *env, target_ulong addr)
+{
+ /* TODO: Make this something that isn't fixed size. */
+ char *s = malloc(1024);
+ size_t len = 0;
+
+ if (!s) {
+ return NULL;
+ }
+ do {
+ if (cpu_memory_rw_debug(env_cpu(env), addr++, s + len, 1, 0)) {
+ free(s);
+ return NULL;
+ }
+ } while (s[len++]);
+ return s;
+}
+
+void softmmu_unlock_user(CPUArchState *env, void *p,
+ target_ulong addr, target_ulong len)
+{
+ if (len) {
+ cpu_memory_rw_debug(env_cpu(env), addr, p, len, 1);
+ }
+ free(p);
+}
diff --git a/semihosting/meson.build b/semihosting/meson.build
index 4344e43fb9..10b3b99921 100644
--- a/semihosting/meson.build
+++ b/semihosting/meson.build
@@ -1,6 +1,7 @@
specific_ss.add(when: ['CONFIG_SEMIHOSTING', 'CONFIG_SOFTMMU'], if_true: files(
'config.c',
'console.c',
+ 'uaccess.c',
))
specific_ss.add(when: ['CONFIG_ARM_COMPATIBLE_SEMIHOSTING'],
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 05/43] semihosting: Add target_strlen for softmmu-uaccess.h
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (3 preceding siblings ...)
2022-04-30 13:28 ` [PATCH 04/43] semihosting: Move softmmu-uaccess functions out of line Richard Henderson
@ 2022-04-30 13:28 ` Richard Henderson
2022-04-30 13:28 ` [PATCH 06/43] semihosting: Simplify softmmu_lock_user_string Richard Henderson
` (38 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:28 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
Mirror the user-only function of the same name.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
include/semihosting/softmmu-uaccess.h | 3 +++
semihosting/uaccess.c | 29 +++++++++++++++++++++++++++
2 files changed, 32 insertions(+)
diff --git a/include/semihosting/softmmu-uaccess.h b/include/semihosting/softmmu-uaccess.h
index 03300376d3..4f08dfc098 100644
--- a/include/semihosting/softmmu-uaccess.h
+++ b/include/semihosting/softmmu-uaccess.h
@@ -53,4 +53,7 @@ void softmmu_unlock_user(CPUArchState *env, void *p,
target_ulong addr, target_ulong len);
#define unlock_user(s, args, len) softmmu_unlock_user(env, s, args, len)
+ssize_t softmmu_strlen_user(CPUArchState *env, target_ulong addr);
+#define target_strlen(p) softmmu_strlen_user(env, p)
+
#endif /* SEMIHOSTING_SOFTMMU_UACCESS_H */
diff --git a/semihosting/uaccess.c b/semihosting/uaccess.c
index 0d3b32b75d..3cd809122c 100644
--- a/semihosting/uaccess.c
+++ b/semihosting/uaccess.c
@@ -23,6 +23,35 @@ void *softmmu_lock_user(CPUArchState *env, target_ulong addr,
return p;
}
+ssize_t softmmu_strlen_user(CPUArchState *env, target_ulong addr)
+{
+ char buf[256];
+ size_t len = 0;
+
+ while (1) {
+ size_t chunk;
+ char *p;
+
+ chunk = -(addr | TARGET_PAGE_MASK);
+ chunk = MIN(chunk, sizeof(buf));
+
+ if (cpu_memory_rw_debug(env_cpu(env), addr, buf, chunk, 0)) {
+ return -1;
+ }
+ p = memchr(buf, 0, chunk);
+ if (p) {
+ len += p - buf;
+ return len <= INT32_MAX ? (ssize_t)len : -1;
+ }
+
+ len += chunk;
+ addr += chunk;
+ if (len > INT32_MAX) {
+ return -1;
+ }
+ }
+}
+
char *softmmu_lock_user_string(CPUArchState *env, target_ulong addr)
{
/* TODO: Make this something that isn't fixed size. */
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 06/43] semihosting: Simplify softmmu_lock_user_string
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (4 preceding siblings ...)
2022-04-30 13:28 ` [PATCH 05/43] semihosting: Add target_strlen for softmmu-uaccess.h Richard Henderson
@ 2022-04-30 13:28 ` Richard Henderson
2022-04-30 13:28 ` [PATCH 07/43] semihosting: Split out guestfd.c Richard Henderson
` (37 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:28 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
We are not currently bounding the search to the 1024 bytes
that we allocated, possibly overrunning the buffer.
Use softmmu_strlen_user to find the length and allocate the
correct size from the beginning.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
semihosting/uaccess.c | 15 +++------------
1 file changed, 3 insertions(+), 12 deletions(-)
diff --git a/semihosting/uaccess.c b/semihosting/uaccess.c
index 3cd809122c..f5fc94c401 100644
--- a/semihosting/uaccess.c
+++ b/semihosting/uaccess.c
@@ -54,20 +54,11 @@ ssize_t softmmu_strlen_user(CPUArchState *env, target_ulong addr)
char *softmmu_lock_user_string(CPUArchState *env, target_ulong addr)
{
- /* TODO: Make this something that isn't fixed size. */
- char *s = malloc(1024);
- size_t len = 0;
-
- if (!s) {
+ ssize_t len = softmmu_strlen_user(env, addr);
+ if (len < 0) {
return NULL;
}
- do {
- if (cpu_memory_rw_debug(env_cpu(env), addr++, s + len, 1, 0)) {
- free(s);
- return NULL;
- }
- } while (s[len++]);
- return s;
+ return softmmu_lock_user(env, addr, len + 1, true);
}
void softmmu_unlock_user(CPUArchState *env, void *p,
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 07/43] semihosting: Split out guestfd.c
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (5 preceding siblings ...)
2022-04-30 13:28 ` [PATCH 06/43] semihosting: Simplify softmmu_lock_user_string Richard Henderson
@ 2022-04-30 13:28 ` Richard Henderson
2022-04-30 13:28 ` [PATCH 08/43] semihosting: Generalize GuestFDFeatureFile Richard Henderson
` (36 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:28 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
In arm-compat-semi.c, we have more advanced treatment of
guest file descriptors than we do in other implementations.
Split out GuestFD and related functions to a new file so
that they can be shared.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
configs/targets/aarch64-linux-user.mak | 1 +
configs/targets/aarch64_be-linux-user.mak | 1 +
configs/targets/arm-linux-user.mak | 1 +
configs/targets/armeb-linux-user.mak | 1 +
configs/targets/riscv32-linux-user.mak | 1 +
configs/targets/riscv64-linux-user.mak | 1 +
include/semihosting/guestfd.h | 40 +++++++
semihosting/arm-compat-semi.c | 125 +---------------------
semihosting/guestfd.c | 116 ++++++++++++++++++++
semihosting/meson.build | 4 +
10 files changed, 168 insertions(+), 123 deletions(-)
create mode 100644 include/semihosting/guestfd.h
create mode 100644 semihosting/guestfd.c
diff --git a/configs/targets/aarch64-linux-user.mak b/configs/targets/aarch64-linux-user.mak
index d0c603c54e..db552f1839 100644
--- a/configs/targets/aarch64-linux-user.mak
+++ b/configs/targets/aarch64-linux-user.mak
@@ -2,4 +2,5 @@ TARGET_ARCH=aarch64
TARGET_BASE_ARCH=arm
TARGET_XML_FILES= gdb-xml/aarch64-core.xml gdb-xml/aarch64-fpu.xml
TARGET_HAS_BFLT=y
+CONFIG_SEMIHOSTING=y
CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/configs/targets/aarch64_be-linux-user.mak b/configs/targets/aarch64_be-linux-user.mak
index 7794424745..dc78044fb1 100644
--- a/configs/targets/aarch64_be-linux-user.mak
+++ b/configs/targets/aarch64_be-linux-user.mak
@@ -3,4 +3,5 @@ TARGET_BASE_ARCH=arm
TARGET_BIG_ENDIAN=y
TARGET_XML_FILES= gdb-xml/aarch64-core.xml gdb-xml/aarch64-fpu.xml
TARGET_HAS_BFLT=y
+CONFIG_SEMIHOSTING=y
CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/configs/targets/arm-linux-user.mak b/configs/targets/arm-linux-user.mak
index 3e10d6b15d..7f5d65794c 100644
--- a/configs/targets/arm-linux-user.mak
+++ b/configs/targets/arm-linux-user.mak
@@ -3,4 +3,5 @@ TARGET_SYSTBL_ABI=common,oabi
TARGET_SYSTBL=syscall.tbl
TARGET_XML_FILES= gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-vfp-sysregs.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml gdb-xml/arm-m-profile-mve.xml
TARGET_HAS_BFLT=y
+CONFIG_SEMIHOSTING=y
CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/configs/targets/armeb-linux-user.mak b/configs/targets/armeb-linux-user.mak
index a249cc2e29..943d0d87bf 100644
--- a/configs/targets/armeb-linux-user.mak
+++ b/configs/targets/armeb-linux-user.mak
@@ -4,4 +4,5 @@ TARGET_SYSTBL=syscall.tbl
TARGET_BIG_ENDIAN=y
TARGET_XML_FILES= gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-vfp-sysregs.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml gdb-xml/arm-m-profile-mve.xml
TARGET_HAS_BFLT=y
+CONFIG_SEMIHOSTING=y
CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/configs/targets/riscv32-linux-user.mak b/configs/targets/riscv32-linux-user.mak
index bd2f1fd497..9761618e67 100644
--- a/configs/targets/riscv32-linux-user.mak
+++ b/configs/targets/riscv32-linux-user.mak
@@ -2,4 +2,5 @@ TARGET_ARCH=riscv32
TARGET_BASE_ARCH=riscv
TARGET_ABI_DIR=riscv
TARGET_XML_FILES= gdb-xml/riscv-32bit-cpu.xml gdb-xml/riscv-32bit-fpu.xml gdb-xml/riscv-64bit-fpu.xml gdb-xml/riscv-32bit-virtual.xml
+CONFIG_SEMIHOSTING=y
CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/configs/targets/riscv64-linux-user.mak b/configs/targets/riscv64-linux-user.mak
index 4aca7662ce..cfd1fd382f 100644
--- a/configs/targets/riscv64-linux-user.mak
+++ b/configs/targets/riscv64-linux-user.mak
@@ -2,4 +2,5 @@ TARGET_ARCH=riscv64
TARGET_BASE_ARCH=riscv
TARGET_ABI_DIR=riscv
TARGET_XML_FILES= gdb-xml/riscv-64bit-cpu.xml gdb-xml/riscv-32bit-fpu.xml gdb-xml/riscv-64bit-fpu.xml gdb-xml/riscv-64bit-virtual.xml
+CONFIG_SEMIHOSTING=y
CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y
diff --git a/include/semihosting/guestfd.h b/include/semihosting/guestfd.h
new file mode 100644
index 0000000000..5d6e744305
--- /dev/null
+++ b/include/semihosting/guestfd.h
@@ -0,0 +1,40 @@
+/*
+ * Hosted file support for semihosting syscalls.
+ *
+ * Copyright (c) 2005, 2007 CodeSourcery.
+ * Copyright (c) 2019 Linaro
+ * Copyright © 2020 by Keith Packard <keithp@keithp.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef SEMIHOSTING_GUESTFD_H
+#define SEMIHOSTING_GUESTFD_H
+
+typedef enum GuestFDType {
+ GuestFDUnused = 0,
+ GuestFDHost = 1,
+ GuestFDGDB = 2,
+ GuestFDFeatureFile = 3,
+} GuestFDType;
+
+/*
+ * Guest file descriptors are integer indexes into an array of
+ * these structures (we will dynamically resize as necessary).
+ */
+typedef struct GuestFD {
+ GuestFDType type;
+ union {
+ int hostfd;
+ unsigned featurefile_offset;
+ };
+} GuestFD;
+
+int alloc_guestfd(void);
+void dealloc_guestfd(int guestfd);
+GuestFD *get_guestfd(int guestfd);
+
+void associate_guestfd(int guestfd, int hostfd);
+void init_featurefile_guestfd(int guestfd);
+
+#endif /* SEMIHOSTING_GUESTFD_H */
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index dbef280b87..c092138031 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -32,12 +32,13 @@
*/
#include "qemu/osdep.h"
-
#include "semihosting/semihost.h"
#include "semihosting/console.h"
#include "semihosting/common-semi.h"
+#include "semihosting/guestfd.h"
#include "qemu/timer.h"
#include "exec/gdbstub.h"
+
#ifdef CONFIG_USER_ONLY
#include "qemu.h"
@@ -123,27 +124,6 @@ static int open_modeflags[12] = {
O_RDWR | O_CREAT | O_APPEND | O_BINARY
};
-typedef enum GuestFDType {
- GuestFDUnused = 0,
- GuestFDHost = 1,
- GuestFDGDB = 2,
- GuestFDFeatureFile = 3,
-} GuestFDType;
-
-/*
- * Guest file descriptors are integer indexes into an array of
- * these structures (we will dynamically resize as necessary).
- */
-typedef struct GuestFD {
- GuestFDType type;
- union {
- int hostfd;
- target_ulong featurefile_offset;
- };
-} GuestFD;
-
-static GArray *guestfd_array;
-
#ifndef CONFIG_USER_ONLY
/**
@@ -268,98 +248,6 @@ common_semi_sys_exit_extended(CPUState *cs, int nr)
#endif
-/*
- * Allocate a new guest file descriptor and return it; if we
- * couldn't allocate a new fd then return -1.
- * This is a fairly simplistic implementation because we don't
- * expect that most semihosting guest programs will make very
- * heavy use of opening and closing fds.
- */
-static int alloc_guestfd(void)
-{
- guint i;
-
- if (!guestfd_array) {
- /* New entries zero-initialized, i.e. type GuestFDUnused */
- guestfd_array = g_array_new(FALSE, TRUE, sizeof(GuestFD));
- }
-
- /* SYS_OPEN should return nonzero handle on success. Start guestfd from 1 */
- for (i = 1; i < guestfd_array->len; i++) {
- GuestFD *gf = &g_array_index(guestfd_array, GuestFD, i);
-
- if (gf->type == GuestFDUnused) {
- return i;
- }
- }
-
- /* All elements already in use: expand the array */
- g_array_set_size(guestfd_array, i + 1);
- return i;
-}
-
-/*
- * Look up the guestfd in the data structure; return NULL
- * for out of bounds, but don't check whether the slot is unused.
- * This is used internally by the other guestfd functions.
- */
-static GuestFD *do_get_guestfd(int guestfd)
-{
- if (!guestfd_array) {
- return NULL;
- }
-
- if (guestfd <= 0 || guestfd >= guestfd_array->len) {
- return NULL;
- }
-
- return &g_array_index(guestfd_array, GuestFD, guestfd);
-}
-
-/*
- * Associate the specified guest fd (which must have been
- * allocated via alloc_fd() and not previously used) with
- * the specified host/gdb fd.
- */
-static void associate_guestfd(int guestfd, int hostfd)
-{
- GuestFD *gf = do_get_guestfd(guestfd);
-
- assert(gf);
- gf->type = use_gdb_syscalls() ? GuestFDGDB : GuestFDHost;
- gf->hostfd = hostfd;
-}
-
-/*
- * Deallocate the specified guest file descriptor. This doesn't
- * close the host fd, it merely undoes the work of alloc_fd().
- */
-static void dealloc_guestfd(int guestfd)
-{
- GuestFD *gf = do_get_guestfd(guestfd);
-
- assert(gf);
- gf->type = GuestFDUnused;
-}
-
-/*
- * Given a guest file descriptor, get the associated struct.
- * If the fd is not valid, return NULL. This is the function
- * used by the various semihosting calls to validate a handle
- * from the guest.
- * Note: calling alloc_guestfd() or dealloc_guestfd() will
- * invalidate any GuestFD* obtained by calling this function.
- */
-static GuestFD *get_guestfd(int guestfd)
-{
- GuestFD *gf = do_get_guestfd(guestfd);
-
- if (!gf || gf->type == GuestFDUnused) {
- return NULL;
- }
- return gf;
-}
-
/*
* The semihosting API has no concept of its errno being thread-safe,
* as the API design predates SMP CPUs and was intended as a simple
@@ -665,15 +553,6 @@ static const uint8_t featurefile_data[] = {
SH_EXT_EXIT_EXTENDED | SH_EXT_STDOUT_STDERR, /* Feature byte 0 */
};
-static void init_featurefile_guestfd(int guestfd)
-{
- GuestFD *gf = do_get_guestfd(guestfd);
-
- assert(gf);
- gf->type = GuestFDFeatureFile;
- gf->featurefile_offset = 0;
-}
-
static uint32_t featurefile_closefn(CPUState *cs, GuestFD *gf)
{
/* Nothing to do */
diff --git a/semihosting/guestfd.c b/semihosting/guestfd.c
new file mode 100644
index 0000000000..e77265db0f
--- /dev/null
+++ b/semihosting/guestfd.c
@@ -0,0 +1,116 @@
+/*
+ * Hosted file support for semihosting syscalls.
+ *
+ * Copyright (c) 2005, 2007 CodeSourcery.
+ * Copyright (c) 2019 Linaro
+ * Copyright © 2020 by Keith Packard <keithp@keithp.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "exec/gdbstub.h"
+#include "semihosting/guestfd.h"
+
+static GArray *guestfd_array;
+
+/*
+ * Allocate a new guest file descriptor and return it; if we
+ * couldn't allocate a new fd then return -1.
+ * This is a fairly simplistic implementation because we don't
+ * expect that most semihosting guest programs will make very
+ * heavy use of opening and closing fds.
+ */
+int alloc_guestfd(void)
+{
+ guint i;
+
+ if (!guestfd_array) {
+ /* New entries zero-initialized, i.e. type GuestFDUnused */
+ guestfd_array = g_array_new(FALSE, TRUE, sizeof(GuestFD));
+ }
+
+ /* SYS_OPEN should return nonzero handle on success. Start guestfd from 1 */
+ for (i = 1; i < guestfd_array->len; i++) {
+ GuestFD *gf = &g_array_index(guestfd_array, GuestFD, i);
+
+ if (gf->type == GuestFDUnused) {
+ return i;
+ }
+ }
+
+ /* All elements already in use: expand the array */
+ g_array_set_size(guestfd_array, i + 1);
+ return i;
+}
+
+/*
+ * Look up the guestfd in the data structure; return NULL
+ * for out of bounds, but don't check whether the slot is unused.
+ * This is used internally by the other guestfd functions.
+ */
+static GuestFD *do_get_guestfd(int guestfd)
+{
+ if (!guestfd_array) {
+ return NULL;
+ }
+
+ if (guestfd <= 0 || guestfd >= guestfd_array->len) {
+ return NULL;
+ }
+
+ return &g_array_index(guestfd_array, GuestFD, guestfd);
+}
+
+/*
+ * Given a guest file descriptor, get the associated struct.
+ * If the fd is not valid, return NULL. This is the function
+ * used by the various semihosting calls to validate a handle
+ * from the guest.
+ * Note: calling alloc_guestfd() or dealloc_guestfd() will
+ * invalidate any GuestFD* obtained by calling this function.
+ */
+GuestFD *get_guestfd(int guestfd)
+{
+ GuestFD *gf = do_get_guestfd(guestfd);
+
+ if (!gf || gf->type == GuestFDUnused) {
+ return NULL;
+ }
+ return gf;
+}
+
+/*
+ * Associate the specified guest fd (which must have been
+ * allocated via alloc_fd() and not previously used) with
+ * the specified host/gdb fd.
+ */
+void associate_guestfd(int guestfd, int hostfd)
+{
+ GuestFD *gf = do_get_guestfd(guestfd);
+
+ assert(gf);
+ gf->type = use_gdb_syscalls() ? GuestFDGDB : GuestFDHost;
+ gf->hostfd = hostfd;
+}
+
+void init_featurefile_guestfd(int guestfd)
+{
+ GuestFD *gf = do_get_guestfd(guestfd);
+
+ assert(gf);
+ gf->type = GuestFDFeatureFile;
+ gf->featurefile_offset = 0;
+}
+
+/*
+ * Deallocate the specified guest file descriptor. This doesn't
+ * close the host fd, it merely undoes the work of alloc_fd().
+ */
+void dealloc_guestfd(int guestfd)
+{
+ GuestFD *gf = do_get_guestfd(guestfd);
+
+ assert(gf);
+ gf->type = GuestFDUnused;
+}
diff --git a/semihosting/meson.build b/semihosting/meson.build
index 10b3b99921..d2c1c37bfd 100644
--- a/semihosting/meson.build
+++ b/semihosting/meson.build
@@ -1,3 +1,7 @@
+specific_ss.add(when: 'CONFIG_SEMIHOSTING', if_true: files(
+ 'guestfd.c',
+))
+
specific_ss.add(when: ['CONFIG_SEMIHOSTING', 'CONFIG_SOFTMMU'], if_true: files(
'config.c',
'console.c',
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 08/43] semihosting: Generalize GuestFDFeatureFile
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (6 preceding siblings ...)
2022-04-30 13:28 ` [PATCH 07/43] semihosting: Split out guestfd.c Richard Henderson
@ 2022-04-30 13:28 ` Richard Henderson
2022-04-30 13:28 ` [PATCH 09/43] semihosting: Return void from do_common_semihosting Richard Henderson
` (35 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:28 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
Rather than hard-coding the buffer from which we deliver data,
pass it in on initialization. This decouples the feature from
ARM semihosting.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
include/semihosting/guestfd.h | 10 ++++++---
semihosting/arm-compat-semi.c | 39 ++++++++++++++++++-----------------
semihosting/guestfd.c | 8 ++++---
3 files changed, 32 insertions(+), 25 deletions(-)
diff --git a/include/semihosting/guestfd.h b/include/semihosting/guestfd.h
index 5d6e744305..5aa2722cb2 100644
--- a/include/semihosting/guestfd.h
+++ b/include/semihosting/guestfd.h
@@ -15,7 +15,7 @@ typedef enum GuestFDType {
GuestFDUnused = 0,
GuestFDHost = 1,
GuestFDGDB = 2,
- GuestFDFeatureFile = 3,
+ GuestFDStatic = 3,
} GuestFDType;
/*
@@ -26,7 +26,11 @@ typedef struct GuestFD {
GuestFDType type;
union {
int hostfd;
- unsigned featurefile_offset;
+ struct {
+ const uint8_t *data;
+ size_t len;
+ size_t off;
+ } staticfile;
};
} GuestFD;
@@ -35,6 +39,6 @@ void dealloc_guestfd(int guestfd);
GuestFD *get_guestfd(int guestfd);
void associate_guestfd(int guestfd, int hostfd);
-void init_featurefile_guestfd(int guestfd);
+void staticfile_guestfd(int guestfd, const uint8_t *data, size_t len);
#endif /* SEMIHOSTING_GUESTFD_H */
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index c092138031..c6bfd4d1ba 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -553,13 +553,13 @@ static const uint8_t featurefile_data[] = {
SH_EXT_EXIT_EXTENDED | SH_EXT_STDOUT_STDERR, /* Feature byte 0 */
};
-static uint32_t featurefile_closefn(CPUState *cs, GuestFD *gf)
+static uint32_t staticfile_closefn(CPUState *cs, GuestFD *gf)
{
/* Nothing to do */
return 0;
}
-static uint32_t featurefile_writefn(CPUState *cs, GuestFD *gf,
+static uint32_t staticfile_writefn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
/* This fd can never be open for writing */
@@ -568,7 +568,7 @@ static uint32_t featurefile_writefn(CPUState *cs, GuestFD *gf,
return set_swi_errno(cs, -1);
}
-static uint32_t featurefile_readfn(CPUState *cs, GuestFD *gf,
+static uint32_t staticfile_readfn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
CPUArchState *env = cs->env_ptr;
@@ -582,11 +582,11 @@ static uint32_t featurefile_readfn(CPUState *cs, GuestFD *gf,
}
for (i = 0; i < len; i++) {
- if (gf->featurefile_offset >= sizeof(featurefile_data)) {
+ if (gf->staticfile.off >= gf->staticfile.len) {
break;
}
- s[i] = featurefile_data[gf->featurefile_offset];
- gf->featurefile_offset++;
+ s[i] = gf->staticfile.data[gf->staticfile.off];
+ gf->staticfile.off++;
}
unlock_user(s, buf, len);
@@ -595,21 +595,21 @@ static uint32_t featurefile_readfn(CPUState *cs, GuestFD *gf,
return len - i;
}
-static uint32_t featurefile_isattyfn(CPUState *cs, GuestFD *gf)
+static uint32_t staticfile_isattyfn(CPUState *cs, GuestFD *gf)
{
return 0;
}
-static uint32_t featurefile_seekfn(CPUState *cs, GuestFD *gf,
+static uint32_t staticfile_seekfn(CPUState *cs, GuestFD *gf,
target_ulong offset)
{
- gf->featurefile_offset = offset;
+ gf->staticfile.off = offset;
return 0;
}
-static uint32_t featurefile_flenfn(CPUState *cs, GuestFD *gf)
+static uint32_t staticfile_flenfn(CPUState *cs, GuestFD *gf)
{
- return sizeof(featurefile_data);
+ return gf->staticfile.len;
}
typedef struct GuestFDFunctions {
@@ -638,13 +638,13 @@ static const GuestFDFunctions guestfd_fns[] = {
.seekfn = gdb_seekfn,
.flenfn = gdb_flenfn,
},
- [GuestFDFeatureFile] = {
- .closefn = featurefile_closefn,
- .writefn = featurefile_writefn,
- .readfn = featurefile_readfn,
- .isattyfn = featurefile_isattyfn,
- .seekfn = featurefile_seekfn,
- .flenfn = featurefile_flenfn,
+ [GuestFDStatic] = {
+ .closefn = staticfile_closefn,
+ .writefn = staticfile_writefn,
+ .readfn = staticfile_readfn,
+ .isattyfn = staticfile_isattyfn,
+ .seekfn = staticfile_seekfn,
+ .flenfn = staticfile_flenfn,
},
};
@@ -765,7 +765,8 @@ target_ulong do_common_semihosting(CPUState *cs)
errno = EACCES;
return set_swi_errno(cs, -1);
}
- init_featurefile_guestfd(guestfd);
+ staticfile_guestfd(guestfd, featurefile_data,
+ sizeof(featurefile_data));
return guestfd;
}
diff --git a/semihosting/guestfd.c b/semihosting/guestfd.c
index e77265db0f..b6405f5663 100644
--- a/semihosting/guestfd.c
+++ b/semihosting/guestfd.c
@@ -94,13 +94,15 @@ void associate_guestfd(int guestfd, int hostfd)
gf->hostfd = hostfd;
}
-void init_featurefile_guestfd(int guestfd)
+void staticfile_guestfd(int guestfd, const uint8_t *data, size_t len)
{
GuestFD *gf = do_get_guestfd(guestfd);
assert(gf);
- gf->type = GuestFDFeatureFile;
- gf->featurefile_offset = 0;
+ gf->type = GuestFDStatic;
+ gf->staticfile.data = data;
+ gf->staticfile.len = len;
+ gf->staticfile.off = 0;
}
/*
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 09/43] semihosting: Return void from do_common_semihosting
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (7 preceding siblings ...)
2022-04-30 13:28 ` [PATCH 08/43] semihosting: Generalize GuestFDFeatureFile Richard Henderson
@ 2022-04-30 13:28 ` Richard Henderson
2022-04-30 13:28 ` [PATCH 10/43] semihosting: Adjust error checking in common_semi_cb Richard Henderson
` (34 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:28 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
Perform the cleanup in the FIXME comment in common_semi_gdb_syscall.
Do not modify guest registers until the syscall is complete,
which in the gdbstub case is asynchronous.
In the synchronous non-gdbstub case, use common_semi_set_ret
to set the result. Merge set_swi_errno into common_semi_cb.
Rely on the latter for combined return value / errno setting.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
semihosting/common-semi.h | 2 +-
linux-user/aarch64/cpu_loop.c | 2 +-
linux-user/arm/cpu_loop.c | 2 +-
linux-user/riscv/cpu_loop.c | 2 +-
semihosting/arm-compat-semi.c | 571 ++++++++++++++++------------------
target/arm/helper.c | 4 +-
target/arm/m_helper.c | 2 +-
target/riscv/cpu_helper.c | 2 +-
8 files changed, 278 insertions(+), 309 deletions(-)
diff --git a/semihosting/common-semi.h b/semihosting/common-semi.h
index 0bfab1c669..0a91db7c41 100644
--- a/semihosting/common-semi.h
+++ b/semihosting/common-semi.h
@@ -34,6 +34,6 @@
#ifndef COMMON_SEMI_H
#define COMMON_SEMI_H
-target_ulong do_common_semihosting(CPUState *cs);
+void do_common_semihosting(CPUState *cs);
#endif /* COMMON_SEMI_H */
diff --git a/linux-user/aarch64/cpu_loop.c b/linux-user/aarch64/cpu_loop.c
index 3b273f6299..f7ef36cd9f 100644
--- a/linux-user/aarch64/cpu_loop.c
+++ b/linux-user/aarch64/cpu_loop.c
@@ -154,7 +154,7 @@ void cpu_loop(CPUARMState *env)
force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc);
break;
case EXCP_SEMIHOST:
- env->xregs[0] = do_common_semihosting(cs);
+ do_common_semihosting(cs);
env->pc += 4;
break;
case EXCP_YIELD:
diff --git a/linux-user/arm/cpu_loop.c b/linux-user/arm/cpu_loop.c
index d950409d5b..c0790f3246 100644
--- a/linux-user/arm/cpu_loop.c
+++ b/linux-user/arm/cpu_loop.c
@@ -449,7 +449,7 @@ void cpu_loop(CPUARMState *env)
}
break;
case EXCP_SEMIHOST:
- env->regs[0] = do_common_semihosting(cs);
+ do_common_semihosting(cs);
env->regs[15] += env->thumb ? 2 : 4;
break;
case EXCP_INTERRUPT:
diff --git a/linux-user/riscv/cpu_loop.c b/linux-user/riscv/cpu_loop.c
index 29084c1421..bffca7db12 100644
--- a/linux-user/riscv/cpu_loop.c
+++ b/linux-user/riscv/cpu_loop.c
@@ -81,7 +81,7 @@ void cpu_loop(CPURISCVState *env)
force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc);
break;
case RISCV_EXCP_SEMIHOST:
- env->gpr[xA0] = do_common_semihosting(cs);
+ do_common_semihosting(cs);
env->pc += 4;
break;
default:
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index c6bfd4d1ba..7030dfd587 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -261,20 +261,6 @@ static target_ulong syscall_err;
#include "semihosting/softmmu-uaccess.h"
#endif
-static inline uint32_t set_swi_errno(CPUState *cs, uint32_t code)
-{
- if (code == (uint32_t)-1) {
-#ifdef CONFIG_USER_ONLY
- TaskState *ts = cs->opaque;
-
- ts->swi_errno = errno;
-#else
- syscall_err = errno;
-#endif
- }
- return code;
-}
-
static inline uint32_t get_swi_errno(CPUState *cs)
{
#ifdef CONFIG_USER_ONLY
@@ -290,28 +276,29 @@ static target_ulong common_semi_syscall_len;
static void common_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
{
- target_ulong reg0 = common_semi_arg(cs, 0);
-
if (ret == (target_ulong)-1) {
- errno = err;
- set_swi_errno(cs, -1);
- reg0 = ret;
+#ifdef CONFIG_USER_ONLY
+ TaskState *ts = cs->opaque;
+ ts->swi_errno = err;
+#else
+ syscall_err = err;
+#endif
} else {
/* Fixup syscalls that use nonstardard return conventions. */
+ target_ulong reg0 = common_semi_arg(cs, 0);
switch (reg0) {
case TARGET_SYS_WRITE:
case TARGET_SYS_READ:
- reg0 = common_semi_syscall_len - ret;
+ ret = common_semi_syscall_len - ret;
break;
case TARGET_SYS_SEEK:
- reg0 = 0;
+ ret = 0;
break;
default:
- reg0 = ret;
break;
}
}
- common_semi_set_ret(cs, reg0);
+ common_semi_set_ret(cs, ret);
}
static target_ulong common_semi_flen_buf(CPUState *cs)
@@ -351,9 +338,8 @@ common_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
cpu_memory_rw_debug(cs, common_semi_flen_buf(cs) + 32,
(uint8_t *)&size, 4, 0);
size = be32_to_cpu(size);
+ common_semi_cb(cs, -1, err);
common_semi_set_ret(cs, size);
- errno = err;
- set_swi_errno(cs, -1);
}
static int common_semi_open_guestfd;
@@ -362,64 +348,32 @@ static void
common_semi_open_cb(CPUState *cs, target_ulong ret, target_ulong err)
{
if (ret == (target_ulong)-1) {
- errno = err;
- set_swi_errno(cs, -1);
dealloc_guestfd(common_semi_open_guestfd);
} else {
associate_guestfd(common_semi_open_guestfd, ret);
ret = common_semi_open_guestfd;
}
- common_semi_set_ret(cs, ret);
-}
-
-static target_ulong
-common_semi_gdb_syscall(CPUState *cs, gdb_syscall_complete_cb cb,
- const char *fmt, ...)
-{
- va_list va;
-
- va_start(va, fmt);
- gdb_do_syscallv(cb, fmt, va);
- va_end(va);
-
- /*
- * FIXME: in softmmu mode, the gdbstub will schedule our callback
- * to occur, but will not actually call it to complete the syscall
- * until after this function has returned and we are back in the
- * CPU main loop. Therefore callers to this function must not
- * do anything with its return value, because it is not necessarily
- * the result of the syscall, but could just be the old value of X0.
- * The only thing safe to do with this is that the callers of
- * do_common_semihosting() will write it straight back into X0.
- * (In linux-user mode, the callback will have happened before
- * gdb_do_syscallv() returns.)
- *
- * We should tidy this up so neither this function nor
- * do_common_semihosting() return a value, so the mistake of
- * doing something with the return value is not possible to make.
- */
-
- return common_semi_arg(cs, 0);
+ common_semi_cb(cs, ret, err);
}
/*
* Types for functions implementing various semihosting calls
* for specific types of guest file descriptor. These must all
- * do the work and return the required return value for the guest,
- * setting the guest errno if appropriate.
+ * do the work and return the required return value to the guest
+ * via common_semi_cb.
*/
-typedef uint32_t sys_closefn(CPUState *cs, GuestFD *gf);
-typedef uint32_t sys_writefn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len);
-typedef uint32_t sys_readfn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len);
-typedef uint32_t sys_isattyfn(CPUState *cs, GuestFD *gf);
-typedef uint32_t sys_seekfn(CPUState *cs, GuestFD *gf,
- target_ulong offset);
-typedef uint32_t sys_flenfn(CPUState *cs, GuestFD *gf);
+typedef void sys_closefn(CPUState *cs, GuestFD *gf);
+typedef void sys_writefn(CPUState *cs, GuestFD *gf,
+ target_ulong buf, uint32_t len);
+typedef void sys_readfn(CPUState *cs, GuestFD *gf,
+ target_ulong buf, uint32_t len);
+typedef void sys_isattyfn(CPUState *cs, GuestFD *gf);
+typedef void sys_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset);
+typedef void sys_flenfn(CPUState *cs, GuestFD *gf);
-static uint32_t host_closefn(CPUState *cs, GuestFD *gf)
+static void host_closefn(CPUState *cs, GuestFD *gf)
{
+ int ret;
/*
* Only close the underlying host fd if it's one we opened on behalf
* of the guest in SYS_OPEN.
@@ -427,113 +381,106 @@ static uint32_t host_closefn(CPUState *cs, GuestFD *gf)
if (gf->hostfd == STDIN_FILENO ||
gf->hostfd == STDOUT_FILENO ||
gf->hostfd == STDERR_FILENO) {
- return 0;
+ ret = 0;
+ } else {
+ ret = close(gf->hostfd);
}
- return set_swi_errno(cs, close(gf->hostfd));
+ common_semi_cb(cs, ret, ret ? errno : 0);
}
-static uint32_t host_writefn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
+static void host_writefn(CPUState *cs, GuestFD *gf,
+ target_ulong buf, uint32_t len)
{
CPUArchState *env = cs->env_ptr;
- uint32_t ret;
+ uint32_t ret = 0;
char *s = lock_user(VERIFY_READ, buf, len, 1);
(void) env; /* Used in arm softmmu lock_user implicitly */
- if (!s) {
- /* Return bytes not written on error */
- return len;
+ if (s) {
+ ret = write(gf->hostfd, s, len);
+ unlock_user(s, buf, 0);
+ if (ret == (uint32_t)-1) {
+ ret = 0;
+ }
}
- ret = set_swi_errno(cs, write(gf->hostfd, s, len));
- unlock_user(s, buf, 0);
- if (ret == (uint32_t)-1) {
- ret = 0;
- }
- /* Return bytes not written */
- return len - ret;
+ /* Return bytes not written, on error as well. */
+ common_semi_cb(cs, len - ret, 0);
}
-static uint32_t host_readfn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
+static void host_readfn(CPUState *cs, GuestFD *gf,
+ target_ulong buf, uint32_t len)
{
CPUArchState *env = cs->env_ptr;
- uint32_t ret;
+ uint32_t ret = 0;
char *s = lock_user(VERIFY_WRITE, buf, len, 0);
(void) env; /* Used in arm softmmu lock_user implicitly */
- if (!s) {
- /* return bytes not read */
- return len;
+ if (s) {
+ do {
+ ret = read(gf->hostfd, s, len);
+ } while (ret == -1 && errno == EINTR);
+ unlock_user(s, buf, len);
+ if (ret == (uint32_t)-1) {
+ ret = 0;
+ }
}
- do {
- ret = set_swi_errno(cs, read(gf->hostfd, s, len));
- } while (ret == -1 && errno == EINTR);
- unlock_user(s, buf, len);
- if (ret == (uint32_t)-1) {
- ret = 0;
- }
- /* Return bytes not read */
- return len - ret;
+ /* Return bytes not read, on error as well. */
+ common_semi_cb(cs, len - ret, 0);
}
-static uint32_t host_isattyfn(CPUState *cs, GuestFD *gf)
+static void host_isattyfn(CPUState *cs, GuestFD *gf)
{
- return isatty(gf->hostfd);
+ common_semi_cb(cs, isatty(gf->hostfd), 0);
}
-static uint32_t host_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
+static void host_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
{
- uint32_t ret = set_swi_errno(cs, lseek(gf->hostfd, offset, SEEK_SET));
- if (ret == (uint32_t)-1) {
- return -1;
- }
- return 0;
+ off_t ret = lseek(gf->hostfd, offset, SEEK_SET);
+ common_semi_cb(cs, ret, ret == -1 ? errno : 0);
}
-static uint32_t host_flenfn(CPUState *cs, GuestFD *gf)
+static void host_flenfn(CPUState *cs, GuestFD *gf)
{
struct stat buf;
- uint32_t ret = set_swi_errno(cs, fstat(gf->hostfd, &buf));
- if (ret == (uint32_t)-1) {
- return -1;
+
+ if (fstat(gf->hostfd, &buf)) {
+ common_semi_cb(cs, -1, errno);
+ } else {
+ common_semi_cb(cs, buf.st_size, 0);
}
- return buf.st_size;
}
-static uint32_t gdb_closefn(CPUState *cs, GuestFD *gf)
+static void gdb_closefn(CPUState *cs, GuestFD *gf)
{
- return common_semi_gdb_syscall(cs, common_semi_cb, "close,%x", gf->hostfd);
+ gdb_do_syscall(common_semi_cb, "close,%x", gf->hostfd);
}
-static uint32_t gdb_writefn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
+static void gdb_writefn(CPUState *cs, GuestFD *gf,
+ target_ulong buf, uint32_t len)
{
common_semi_syscall_len = len;
- return common_semi_gdb_syscall(cs, common_semi_cb, "write,%x,%x,%x",
- gf->hostfd, buf, len);
+ gdb_do_syscall(common_semi_cb, "write,%x,%x,%x", gf->hostfd, buf, len);
}
-static uint32_t gdb_readfn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
+static void gdb_readfn(CPUState *cs, GuestFD *gf,
+ target_ulong buf, uint32_t len)
{
common_semi_syscall_len = len;
- return common_semi_gdb_syscall(cs, common_semi_cb, "read,%x,%x,%x",
- gf->hostfd, buf, len);
+ gdb_do_syscall(common_semi_cb, "read,%x,%x,%x", gf->hostfd, buf, len);
}
-static uint32_t gdb_isattyfn(CPUState *cs, GuestFD *gf)
+static void gdb_isattyfn(CPUState *cs, GuestFD *gf)
{
- return common_semi_gdb_syscall(cs, common_semi_cb, "isatty,%x", gf->hostfd);
+ gdb_do_syscall(common_semi_cb, "isatty,%x", gf->hostfd);
}
-static uint32_t gdb_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
+static void gdb_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
{
- return common_semi_gdb_syscall(cs, common_semi_cb, "lseek,%x,%x,0",
- gf->hostfd, offset);
+ gdb_do_syscall(common_semi_cb, "lseek,%x,%x,0", gf->hostfd, offset);
}
-static uint32_t gdb_flenfn(CPUState *cs, GuestFD *gf)
+static void gdb_flenfn(CPUState *cs, GuestFD *gf)
{
- return common_semi_gdb_syscall(cs, common_semi_flen_cb, "fstat,%x,%x",
- gf->hostfd, common_semi_flen_buf(cs));
+ gdb_do_syscall(common_semi_flen_cb, "fstat,%x,%x",
+ gf->hostfd, common_semi_flen_buf(cs));
}
#define SHFB_MAGIC_0 0x53
@@ -553,63 +500,57 @@ static const uint8_t featurefile_data[] = {
SH_EXT_EXIT_EXTENDED | SH_EXT_STDOUT_STDERR, /* Feature byte 0 */
};
-static uint32_t staticfile_closefn(CPUState *cs, GuestFD *gf)
+static void staticfile_closefn(CPUState *cs, GuestFD *gf)
{
/* Nothing to do */
- return 0;
+ common_semi_cb(cs, 0, 0);
}
-static uint32_t staticfile_writefn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
+static void staticfile_writefn(CPUState *cs, GuestFD *gf,
+ target_ulong buf, uint32_t len)
{
/* This fd can never be open for writing */
-
- errno = EBADF;
- return set_swi_errno(cs, -1);
+ common_semi_cb(cs, -1, EBADF);
}
-static uint32_t staticfile_readfn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
+static void staticfile_readfn(CPUState *cs, GuestFD *gf,
+ target_ulong buf, uint32_t len)
{
CPUArchState *env = cs->env_ptr;
- uint32_t i;
+ uint32_t i = 0;
char *s;
(void) env; /* Used in arm softmmu lock_user implicitly */
s = lock_user(VERIFY_WRITE, buf, len, 0);
- if (!s) {
- return len;
- }
-
- for (i = 0; i < len; i++) {
- if (gf->staticfile.off >= gf->staticfile.len) {
- break;
+ if (s) {
+ for (i = 0; i < len; i++) {
+ if (gf->staticfile.off >= gf->staticfile.len) {
+ break;
+ }
+ s[i] = gf->staticfile.data[gf->staticfile.off];
+ gf->staticfile.off++;
}
- s[i] = gf->staticfile.data[gf->staticfile.off];
- gf->staticfile.off++;
+ unlock_user(s, buf, len);
}
- unlock_user(s, buf, len);
-
/* Return number of bytes not read */
- return len - i;
+ common_semi_cb(cs, len - i, 0);
}
-static uint32_t staticfile_isattyfn(CPUState *cs, GuestFD *gf)
+static void staticfile_isattyfn(CPUState *cs, GuestFD *gf)
{
- return 0;
+ common_semi_cb(cs, 0, 0);
}
-static uint32_t staticfile_seekfn(CPUState *cs, GuestFD *gf,
- target_ulong offset)
+static void staticfile_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
{
gf->staticfile.off = offset;
- return 0;
+ common_semi_cb(cs, 0, 0);
}
-static uint32_t staticfile_flenfn(CPUState *cs, GuestFD *gf)
+static void staticfile_flenfn(CPUState *cs, GuestFD *gf)
{
- return gf->staticfile.len;
+ common_semi_cb(cs, gf->staticfile.len, 0);
}
typedef struct GuestFDFunctions {
@@ -668,13 +609,13 @@ static inline bool is_64bit_semihosting(CPUArchState *env)
#define GET_ARG(n) do { \
if (is_64bit_semihosting(env)) { \
if (get_user_u64(arg ## n, args + (n) * 8)) { \
- errno = EFAULT; \
- return set_swi_errno(cs, -1); \
+ common_semi_cb(cs, -1, EFAULT); \
+ return; \
} \
} else { \
if (get_user_u32(arg ## n, args + (n) * 4)) { \
- errno = EFAULT; \
- return set_swi_errno(cs, -1); \
+ common_semi_cb(cs, -1, EFAULT); \
+ return; \
} \
} \
} while (0)
@@ -694,7 +635,7 @@ static inline bool is_64bit_semihosting(CPUArchState *env)
* leave the register unchanged. We use 0xdeadbeef as the return value
* when there isn't a defined return value for the call.
*/
-target_ulong do_common_semihosting(CPUState *cs)
+void do_common_semihosting(CPUState *cs)
{
CPUArchState *env = cs->env_ptr;
target_ulong args;
@@ -714,32 +655,23 @@ target_ulong do_common_semihosting(CPUState *cs)
switch (nr) {
case TARGET_SYS_OPEN:
{
- int guestfd;
+ int ret, err = 0;
+ int hostfd;
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
s = lock_user_string(arg0);
if (!s) {
- errno = EFAULT;
- return set_swi_errno(cs, -1);
+ goto do_fault;
}
if (arg1 >= 12) {
unlock_user(s, arg0, 0);
- errno = EINVAL;
- return set_swi_errno(cs, -1);
- }
-
- guestfd = alloc_guestfd();
- if (guestfd < 0) {
- unlock_user(s, arg0, 0);
- errno = EMFILE;
- return set_swi_errno(cs, -1);
+ common_semi_cb(cs, -1, EINVAL);
+ break;
}
if (strcmp(s, ":tt") == 0) {
- int result_fileno;
-
/*
* We implement SH_EXT_STDOUT_STDERR, so:
* open for read == stdin
@@ -747,63 +679,67 @@ target_ulong do_common_semihosting(CPUState *cs)
* open for append == stderr
*/
if (arg1 < 4) {
- result_fileno = STDIN_FILENO;
+ hostfd = STDIN_FILENO;
} else if (arg1 < 8) {
- result_fileno = STDOUT_FILENO;
+ hostfd = STDOUT_FILENO;
} else {
- result_fileno = STDERR_FILENO;
+ hostfd = STDERR_FILENO;
}
- associate_guestfd(guestfd, result_fileno);
- unlock_user(s, arg0, 0);
- return guestfd;
- }
- if (strcmp(s, ":semihosting-features") == 0) {
- unlock_user(s, arg0, 0);
+ ret = alloc_guestfd();
+ associate_guestfd(ret, hostfd);
+ } else if (strcmp(s, ":semihosting-features") == 0) {
/* We must fail opens for modes other than 0 ('r') or 1 ('rb') */
if (arg1 != 0 && arg1 != 1) {
- dealloc_guestfd(guestfd);
- errno = EACCES;
- return set_swi_errno(cs, -1);
- }
- staticfile_guestfd(guestfd, featurefile_data,
- sizeof(featurefile_data));
- return guestfd;
- }
-
- if (use_gdb_syscalls()) {
- common_semi_open_guestfd = guestfd;
- ret = common_semi_gdb_syscall(cs, common_semi_open_cb,
- "open,%s,%x,1a4", arg0, (int)arg2 + 1,
- gdb_open_modeflags[arg1]);
- } else {
- ret = set_swi_errno(cs, open(s, open_modeflags[arg1], 0644));
- if (ret == (uint32_t)-1) {
- dealloc_guestfd(guestfd);
+ ret = -1;
+ err = EACCES;
} else {
- associate_guestfd(guestfd, ret);
- ret = guestfd;
+ ret = alloc_guestfd();
+ staticfile_guestfd(ret, featurefile_data,
+ sizeof(featurefile_data));
+ }
+ } else if (use_gdb_syscalls()) {
+ unlock_user(s, arg0, 0);
+ common_semi_open_guestfd = alloc_guestfd();
+ gdb_do_syscall(common_semi_open_cb,
+ "open,%s,%x,1a4", arg0, (int)arg2 + 1,
+ gdb_open_modeflags[arg1]);
+ break;
+ } else {
+ hostfd = open(s, open_modeflags[arg1], 0644);
+ if (hostfd < 0) {
+ ret = -1;
+ err = errno;
+ } else {
+ ret = alloc_guestfd();
+ associate_guestfd(ret, hostfd);
}
}
unlock_user(s, arg0, 0);
- return ret;
+ common_semi_cb(cs, ret, err);
+ break;
}
+
case TARGET_SYS_CLOSE:
GET_ARG(0);
gf = get_guestfd(arg0);
if (!gf) {
- errno = EBADF;
- return set_swi_errno(cs, -1);
+ goto do_badf;
}
-
- ret = guestfd_fns[gf->type].closefn(cs, gf);
+ guestfd_fns[gf->type].closefn(cs, gf);
dealloc_guestfd(arg0);
- return ret;
+ break;
+
case TARGET_SYS_WRITEC:
qemu_semihosting_console_outc(cs->env_ptr, args);
- return 0xdeadbeef;
+ common_semi_set_ret(cs, 0xdeadbeef);
+ break;
+
case TARGET_SYS_WRITE0:
- return qemu_semihosting_console_outs(cs->env_ptr, args);
+ ret = qemu_semihosting_console_outs(cs->env_ptr, args);
+ common_semi_set_ret(cs, ret);
+ break;
+
case TARGET_SYS_WRITE:
GET_ARG(0);
GET_ARG(1);
@@ -812,11 +748,11 @@ target_ulong do_common_semihosting(CPUState *cs)
gf = get_guestfd(arg0);
if (!gf) {
- errno = EBADF;
- return set_swi_errno(cs, -1);
+ goto do_badf;
}
+ guestfd_fns[gf->type].writefn(cs, gf, arg1, len);
+ break;
- return guestfd_fns[gf->type].writefn(cs, gf, arg1, len);
case TARGET_SYS_READ:
GET_ARG(0);
GET_ARG(1);
@@ -825,129 +761,150 @@ target_ulong do_common_semihosting(CPUState *cs)
gf = get_guestfd(arg0);
if (!gf) {
- errno = EBADF;
- return set_swi_errno(cs, -1);
+ goto do_badf;
}
+ guestfd_fns[gf->type].readfn(cs, gf, arg1, len);
+ break;
- return guestfd_fns[gf->type].readfn(cs, gf, arg1, len);
case TARGET_SYS_READC:
- return qemu_semihosting_console_inc(cs->env_ptr);
+ ret = qemu_semihosting_console_inc(cs->env_ptr);
+ common_semi_set_ret(cs, ret);
+ break;
+
case TARGET_SYS_ISERROR:
GET_ARG(0);
- return (target_long) arg0 < 0 ? 1 : 0;
+ common_semi_set_ret(cs, (target_long)arg0 < 0);
+ break;
+
case TARGET_SYS_ISTTY:
GET_ARG(0);
gf = get_guestfd(arg0);
if (!gf) {
- errno = EBADF;
- return set_swi_errno(cs, -1);
+ goto do_badf;
}
+ guestfd_fns[gf->type].isattyfn(cs, gf);
+ break;
- return guestfd_fns[gf->type].isattyfn(cs, gf);
case TARGET_SYS_SEEK:
GET_ARG(0);
GET_ARG(1);
gf = get_guestfd(arg0);
if (!gf) {
- errno = EBADF;
- return set_swi_errno(cs, -1);
+ goto do_badf;
}
+ guestfd_fns[gf->type].seekfn(cs, gf, arg1);
+ break;
- return guestfd_fns[gf->type].seekfn(cs, gf, arg1);
case TARGET_SYS_FLEN:
GET_ARG(0);
gf = get_guestfd(arg0);
if (!gf) {
- errno = EBADF;
- return set_swi_errno(cs, -1);
+ goto do_badf;
}
+ guestfd_fns[gf->type].flenfn(cs, gf);
+ break;
- return guestfd_fns[gf->type].flenfn(cs, gf);
case TARGET_SYS_TMPNAM:
+ {
+ int len;
+ char *p;
+
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
- if (asprintf(&s, "/tmp/qemu-%x%02x", getpid(),
- (int) (arg1 & 0xff)) < 0) {
- return -1;
- }
- ul_ret = (target_ulong) -1;
-
+ len = asprintf(&s, "/tmp/qemu-%x%02x", getpid(), (int)arg1 & 0xff);
/* Make sure there's enough space in the buffer */
- if (strlen(s) < arg2) {
- char *output = lock_user(VERIFY_WRITE, arg0, arg2, 0);
- strcpy(output, s);
- unlock_user(output, arg0, arg2);
- ul_ret = 0;
+ if (len < 0 || len >= arg2) {
+ common_semi_set_ret(cs, -1);
+ break;
}
+ p = lock_user(VERIFY_WRITE, arg0, len, 0);
+ if (!p) {
+ goto do_fault;
+ }
+ memcpy(p, s, len + 1);
+ unlock_user(p, arg0, len);
free(s);
- return ul_ret;
+ common_semi_set_ret(cs, 0);
+ break;
+ }
+
case TARGET_SYS_REMOVE:
GET_ARG(0);
GET_ARG(1);
if (use_gdb_syscalls()) {
- ret = common_semi_gdb_syscall(cs, common_semi_cb, "unlink,%s",
- arg0, (int)arg1 + 1);
- } else {
- s = lock_user_string(arg0);
- if (!s) {
- errno = EFAULT;
- return set_swi_errno(cs, -1);
- }
- ret = set_swi_errno(cs, remove(s));
- unlock_user(s, arg0, 0);
+ gdb_do_syscall(common_semi_cb, "unlink,%s",
+ arg0, (int)arg1 + 1);
+ break;
}
- return ret;
+ s = lock_user_string(arg0);
+ if (!s) {
+ goto do_fault;
+ }
+ ret = remove(s);
+ unlock_user(s, arg0, 0);
+ common_semi_cb(cs, ret, ret ? errno : 0);
+ break;
+
case TARGET_SYS_RENAME:
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
GET_ARG(3);
if (use_gdb_syscalls()) {
- return common_semi_gdb_syscall(cs, common_semi_cb, "rename,%s,%s",
- arg0, (int)arg1 + 1, arg2,
- (int)arg3 + 1);
+ gdb_do_syscall(common_semi_cb, "rename,%s,%s",
+ arg0, (int)arg1 + 1, arg2, (int)arg3 + 1);
} else {
char *s2;
+
s = lock_user_string(arg0);
- s2 = lock_user_string(arg2);
- if (!s || !s2) {
- errno = EFAULT;
- ret = set_swi_errno(cs, -1);
- } else {
- ret = set_swi_errno(cs, rename(s, s2));
+ if (!s) {
+ goto do_fault;
}
- if (s2)
- unlock_user(s2, arg2, 0);
- if (s)
+ s2 = lock_user_string(arg2);
+ if (!s2) {
unlock_user(s, arg0, 0);
- return ret;
+ goto do_fault;
+ }
+ ret = rename(s, s2);
+ unlock_user(s2, arg2, 0);
+ unlock_user(s, arg0, 0);
+ common_semi_cb(cs, ret, ret ? errno : 0);
}
+ break;
+
case TARGET_SYS_CLOCK:
- return clock() / (CLOCKS_PER_SEC / 100);
+ common_semi_set_ret(cs, clock() / (CLOCKS_PER_SEC / 100));
+ break;
+
case TARGET_SYS_TIME:
- return set_swi_errno(cs, time(NULL));
+ ul_ret = time(NULL);
+ common_semi_cb(cs, ul_ret, ul_ret == -1 ? errno : 0);
+ break;
+
case TARGET_SYS_SYSTEM:
GET_ARG(0);
GET_ARG(1);
if (use_gdb_syscalls()) {
- return common_semi_gdb_syscall(cs, common_semi_cb, "system,%s",
- arg0, (int)arg1 + 1);
- } else {
- s = lock_user_string(arg0);
- if (!s) {
- errno = EFAULT;
- return set_swi_errno(cs, -1);
- }
- ret = set_swi_errno(cs, system(s));
- unlock_user(s, arg0, 0);
- return ret;
+ gdb_do_syscall(common_semi_cb, "system,%s", arg0, (int)arg1 + 1);
+ break;
}
+ s = lock_user_string(arg0);
+ if (!s) {
+ goto do_fault;
+ }
+ ret = system(s);
+ unlock_user(s, arg0, 0);
+ common_semi_cb(cs, ret, ret == -1 ? errno : 0);
+ break;
+
case TARGET_SYS_ERRNO:
- return get_swi_errno(cs);
+ common_semi_set_ret(cs, get_swi_errno(cs));
+ break;
+
case TARGET_SYS_GET_CMDLINE:
{
/* Build a command-line from the original argv.
@@ -998,22 +955,20 @@ target_ulong do_common_semihosting(CPUState *cs)
if (output_size > input_size) {
/* Not enough space to store command-line arguments. */
- errno = E2BIG;
- return set_swi_errno(cs, -1);
+ common_semi_cb(cs, -1, E2BIG);
+ break;
}
/* Adjust the command-line length. */
if (SET_ARG(1, output_size - 1)) {
/* Couldn't write back to argument block */
- errno = EFAULT;
- return set_swi_errno(cs, -1);
+ goto do_fault;
}
/* Lock the buffer on the ARM side. */
output_buffer = lock_user(VERIFY_WRITE, arg0, output_size, 0);
if (!output_buffer) {
- errno = EFAULT;
- return set_swi_errno(cs, -1);
+ goto do_fault;
}
/* Copy the command-line arguments. */
@@ -1028,9 +983,8 @@ target_ulong do_common_semihosting(CPUState *cs)
if (copy_from_user(output_buffer, ts->info->arg_start,
output_size)) {
- errno = EFAULT;
- status = set_swi_errno(cs, -1);
- goto out;
+ unlock_user(output_buffer, arg0, 0);
+ goto do_fault;
}
/* Separate arguments by white spaces. */
@@ -1043,9 +997,10 @@ target_ulong do_common_semihosting(CPUState *cs)
#endif
/* Unlock the buffer on the ARM side. */
unlock_user(output_buffer, arg0, output_size);
-
- return status;
+ common_semi_cb(cs, status, 0);
}
+ break;
+
case TARGET_SYS_HEAPINFO:
{
target_ulong retvals[4];
@@ -1102,12 +1057,13 @@ target_ulong do_common_semihosting(CPUState *cs)
if (fail) {
/* Couldn't write back to argument block */
- errno = EFAULT;
- return set_swi_errno(cs, -1);
+ goto do_fault;
}
}
- return 0;
+ common_semi_set_ret(cs, 0);
}
+ break;
+
case TARGET_SYS_EXIT:
case TARGET_SYS_EXIT_EXTENDED:
if (common_semi_sys_exit_extended(cs, nr)) {
@@ -1137,6 +1093,7 @@ target_ulong do_common_semihosting(CPUState *cs)
}
gdb_exit(ret);
exit(ret);
+
case TARGET_SYS_ELAPSED:
elapsed = get_clock() - clock_start;
if (sizeof(target_ulong) == 8) {
@@ -1145,10 +1102,14 @@ target_ulong do_common_semihosting(CPUState *cs)
SET_ARG(0, (uint32_t) elapsed);
SET_ARG(1, (uint32_t) (elapsed >> 32));
}
- return 0;
+ common_semi_set_ret(cs, 0);
+ break;
+
case TARGET_SYS_TICKFREQ:
/* qemu always uses nsec */
- return 1000000000;
+ common_semi_set_ret(cs, 1000000000);
+ break;
+
case TARGET_SYS_SYNCCACHE:
/*
* Clean the D-cache and invalidate the I-cache for the specified
@@ -1157,16 +1118,24 @@ target_ulong do_common_semihosting(CPUState *cs)
*/
#ifdef TARGET_ARM
if (is_a64(cs->env_ptr)) {
- return 0;
+ common_semi_set_ret(cs, 0);
+ break;
}
#endif
#ifdef TARGET_RISCV
- return 0;
+ common_semi_set_ret(cs, 0);
#endif
/* fall through -- invalid for A32/T32 */
default:
fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
cpu_dump_state(cs, stderr, 0);
abort();
+
+ do_badf:
+ common_semi_cb(cs, -1, EBADF);
+ break;
+ do_fault:
+ common_semi_cb(cs, -1, EFAULT);
+ break;
}
}
diff --git a/target/arm/helper.c b/target/arm/helper.c
index 63397bbac1..748bb843e5 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -10195,13 +10195,13 @@ static void handle_semihosting(CPUState *cs)
qemu_log_mask(CPU_LOG_INT,
"...handling as semihosting call 0x%" PRIx64 "\n",
env->xregs[0]);
- env->xregs[0] = do_common_semihosting(cs);
+ do_common_semihosting(cs);
env->pc += 4;
} else {
qemu_log_mask(CPU_LOG_INT,
"...handling as semihosting call 0x%x\n",
env->regs[0]);
- env->regs[0] = do_common_semihosting(cs);
+ do_common_semihosting(cs);
env->regs[15] += env->thumb ? 2 : 4;
}
}
diff --git a/target/arm/m_helper.c b/target/arm/m_helper.c
index a740c3e160..308610f6b4 100644
--- a/target/arm/m_helper.c
+++ b/target/arm/m_helper.c
@@ -2373,7 +2373,7 @@ void arm_v7m_cpu_do_interrupt(CPUState *cs)
"...handling as semihosting call 0x%x\n",
env->regs[0]);
#ifdef CONFIG_TCG
- env->regs[0] = do_common_semihosting(cs);
+ do_common_semihosting(cs);
#else
g_assert_not_reached();
#endif
diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index e1aa4f2097..55105cb0cc 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -1345,7 +1345,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
if (cause == RISCV_EXCP_SEMIHOST) {
if (env->priv >= PRV_S) {
- env->gpr[xA0] = do_common_semihosting(cs);
+ do_common_semihosting(cs);
env->pc += 4;
return;
}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 10/43] semihosting: Adjust error checking in common_semi_cb
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (8 preceding siblings ...)
2022-04-30 13:28 ` [PATCH 09/43] semihosting: Return void from do_common_semihosting Richard Henderson
@ 2022-04-30 13:28 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 11/43] semihosting: Move common-semi.h to include/semihosting/ Richard Henderson
` (33 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:28 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
The err parameter is non-zero if and only if an error occured.
Use this instead of ret == -1 for determining if we need to
update the saved errno.
This fixes the errno setting of SYS_ISTTY, which returns 0 on
error, not -1.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
semihosting/arm-compat-semi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index 7030dfd587..18664b1c47 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -276,7 +276,7 @@ static target_ulong common_semi_syscall_len;
static void common_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
{
- if (ret == (target_ulong)-1) {
+ if (err) {
#ifdef CONFIG_USER_ONLY
TaskState *ts = cs->opaque;
ts->swi_errno = err;
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 11/43] semihosting: Move common-semi.h to include/semihosting/
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (9 preceding siblings ...)
2022-04-30 13:28 ` [PATCH 10/43] semihosting: Adjust error checking in common_semi_cb Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 12/43] include/exec: Move gdb open flags to gdbstub.h Richard Henderson
` (32 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
This header is not private to the top-level semihosting directory,
so place it in the public include directory.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
{semihosting => include/semihosting}/common-semi.h | 0
1 file changed, 0 insertions(+), 0 deletions(-)
rename {semihosting => include/semihosting}/common-semi.h (100%)
diff --git a/semihosting/common-semi.h b/include/semihosting/common-semi.h
similarity index 100%
rename from semihosting/common-semi.h
rename to include/semihosting/common-semi.h
--
2.34.1
^ permalink raw reply [flat|nested] 45+ messages in thread
* [PATCH 12/43] include/exec: Move gdb open flags to gdbstub.h
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (10 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 11/43] semihosting: Move common-semi.h to include/semihosting/ Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 13/43] include/exec: Move gdb_stat and gdb_timeval " Richard Henderson
` (31 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
There were 3 copies of these flags. Place them in the
file with gdb_do_syscall, with which they belong.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
include/exec/gdbstub.h | 10 ++++++++++
semihosting/arm-compat-semi.c | 8 --------
target/m68k/m68k-semi.c | 8 --------
target/nios2/nios2-semi.c | 8 --------
4 files changed, 10 insertions(+), 24 deletions(-)
diff --git a/include/exec/gdbstub.h b/include/exec/gdbstub.h
index c35d7334b4..2aaba9c723 100644
--- a/include/exec/gdbstub.h
+++ b/include/exec/gdbstub.h
@@ -10,6 +10,16 @@
#define GDB_WATCHPOINT_READ 3
#define GDB_WATCHPOINT_ACCESS 4
+/* For gdb file i/o remote protocol open flags. */
+#define GDB_O_BINARY 0
+#define GDB_O_RDONLY 0
+#define GDB_O_WRONLY 1
+#define GDB_O_RDWR 2
+#define GDB_O_APPEND 8
+#define GDB_O_CREAT 0x200
+#define GDB_O_TRUNC 0x400
+#define GDB_O_EXCL 0x800
+
#ifdef NEED_CPU_H
#include "cpu.h"
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index 18664b1c47..a1fc4ea039 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -86,14 +86,6 @@
#define O_BINARY 0
#endif
-#define GDB_O_RDONLY 0x000
-#define GDB_O_WRONLY 0x001
-#define GDB_O_RDWR 0x002
-#define GDB_O_APPEND 0x008
-#define GDB_O_CREAT 0x200
-#define GDB_O_TRUNC 0x400
-#define GDB_O_BINARY 0
-
static int gdb_open_modeflags[12] = {
GDB_O_RDONLY,
GDB_O_RDONLY | GDB_O_BINARY,
diff --git a/target/m68k/m68k-semi.c b/target/m68k/m68k-semi.c
index a31db38fc3..475a6b13b7 100644
--- a/target/m68k/m68k-semi.c
+++ b/target/m68k/m68k-semi.c
@@ -69,14 +69,6 @@ struct gdb_timeval {
uint64_t tv_usec; /* microsecond */
} QEMU_PACKED;
-#define GDB_O_RDONLY 0x0
-#define GDB_O_WRONLY 0x1
-#define GDB_O_RDWR 0x2
-#define GDB_O_APPEND 0x8
-#define GDB_O_CREAT 0x200
-#define GDB_O_TRUNC 0x400
-#define GDB_O_EXCL 0x800
-
static int translate_openflags(int flags)
{
int hf;
diff --git a/target/nios2/nios2-semi.c b/target/nios2/nios2-semi.c
index 373e6b9436..0eec1f9a1c 100644
--- a/target/nios2/nios2-semi.c
+++ b/target/nios2/nios2-semi.c
@@ -71,14 +71,6 @@ struct gdb_timeval {
uint64_t tv_usec; /* microsecond */
} QEMU_PACKED;
-#define GDB_O_RDONLY 0x0
-#define GDB_O_WRONLY 0x1
-#define GDB_O_RDWR 0x2
-#define GDB_O_APPEND 0x8
-#define GDB_O_CREAT 0x200
-#define GDB_O_TRUNC 0x400
-#define GDB_O_EXCL 0x800
-
static int translate_openflags(int flags)
{
int hf;
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 13/43] include/exec: Move gdb_stat and gdb_timeval to gdbstub.h
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (11 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 12/43] include/exec: Move gdb open flags to gdbstub.h Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 14/43] semihosting: Use struct gdb_stat in common_semi_flen_cb Richard Henderson
` (30 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
We have two copies of these structures, and require them
in semihosting/ going forward.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
include/exec/gdbstub.h | 25 +++++++++++++++++++++++++
target/m68k/m68k-semi.c | 30 +++---------------------------
target/nios2/nios2-semi.c | 30 +++---------------------------
3 files changed, 31 insertions(+), 54 deletions(-)
diff --git a/include/exec/gdbstub.h b/include/exec/gdbstub.h
index 2aaba9c723..33a262a5a3 100644
--- a/include/exec/gdbstub.h
+++ b/include/exec/gdbstub.h
@@ -20,6 +20,31 @@
#define GDB_O_TRUNC 0x400
#define GDB_O_EXCL 0x800
+/* For gdb file i/o stat/fstat. */
+typedef uint32_t gdb_mode_t;
+typedef uint32_t gdb_time_t;
+
+struct gdb_stat {
+ uint32_t gdb_st_dev; /* device */
+ uint32_t gdb_st_ino; /* inode */
+ gdb_mode_t gdb_st_mode; /* protection */
+ uint32_t gdb_st_nlink; /* number of hard links */
+ uint32_t gdb_st_uid; /* user ID of owner */
+ uint32_t gdb_st_gid; /* group ID of owner */
+ uint32_t gdb_st_rdev; /* device type (if inode device) */
+ uint64_t gdb_st_size; /* total size, in bytes */
+ uint64_t gdb_st_blksize; /* blocksize for filesystem I/O */
+ uint64_t gdb_st_blocks; /* number of blocks allocated */
+ gdb_time_t gdb_st_atime; /* time of last access */
+ gdb_time_t gdb_st_mtime; /* time of last modification */
+ gdb_time_t gdb_st_ctime; /* time of last change */
+} QEMU_PACKED;
+
+struct gdb_timeval {
+ gdb_time_t tv_sec; /* second */
+ uint64_t tv_usec; /* microsecond */
+} QEMU_PACKED;
+
#ifdef NEED_CPU_H
#include "cpu.h"
diff --git a/target/m68k/m68k-semi.c b/target/m68k/m68k-semi.c
index 475a6b13b7..da0186f3ef 100644
--- a/target/m68k/m68k-semi.c
+++ b/target/m68k/m68k-semi.c
@@ -45,30 +45,6 @@
#define HOSTED_ISATTY 12
#define HOSTED_SYSTEM 13
-typedef uint32_t gdb_mode_t;
-typedef uint32_t gdb_time_t;
-
-struct m68k_gdb_stat {
- uint32_t gdb_st_dev; /* device */
- uint32_t gdb_st_ino; /* inode */
- gdb_mode_t gdb_st_mode; /* protection */
- uint32_t gdb_st_nlink; /* number of hard links */
- uint32_t gdb_st_uid; /* user ID of owner */
- uint32_t gdb_st_gid; /* group ID of owner */
- uint32_t gdb_st_rdev; /* device type (if inode device) */
- uint64_t gdb_st_size; /* total size, in bytes */
- uint64_t gdb_st_blksize; /* blocksize for filesystem I/O */
- uint64_t gdb_st_blocks; /* number of blocks allocated */
- gdb_time_t gdb_st_atime; /* time of last access */
- gdb_time_t gdb_st_mtime; /* time of last modification */
- gdb_time_t gdb_st_ctime; /* time of last change */
-} QEMU_PACKED;
-
-struct gdb_timeval {
- gdb_time_t tv_sec; /* second */
- uint64_t tv_usec; /* microsecond */
-} QEMU_PACKED;
-
static int translate_openflags(int flags)
{
int hf;
@@ -90,9 +66,9 @@ static int translate_openflags(int flags)
static void translate_stat(CPUM68KState *env, target_ulong addr, struct stat *s)
{
- struct m68k_gdb_stat *p;
+ struct gdb_stat *p;
- if (!(p = lock_user(VERIFY_WRITE, addr, sizeof(struct m68k_gdb_stat), 0)))
+ if (!(p = lock_user(VERIFY_WRITE, addr, sizeof(struct gdb_stat), 0)))
/* FIXME - should this return an error code? */
return;
p->gdb_st_dev = cpu_to_be32(s->st_dev);
@@ -114,7 +90,7 @@ static void translate_stat(CPUM68KState *env, target_ulong addr, struct stat *s)
p->gdb_st_atime = cpu_to_be32(s->st_atime);
p->gdb_st_mtime = cpu_to_be32(s->st_mtime);
p->gdb_st_ctime = cpu_to_be32(s->st_ctime);
- unlock_user(p, addr, sizeof(struct m68k_gdb_stat));
+ unlock_user(p, addr, sizeof(struct gdb_stat));
}
static void m68k_semi_return_u32(CPUM68KState *env, uint32_t ret, uint32_t err)
diff --git a/target/nios2/nios2-semi.c b/target/nios2/nios2-semi.c
index 0eec1f9a1c..3e504a6c5f 100644
--- a/target/nios2/nios2-semi.c
+++ b/target/nios2/nios2-semi.c
@@ -47,30 +47,6 @@
#define HOSTED_ISATTY 12
#define HOSTED_SYSTEM 13
-typedef uint32_t gdb_mode_t;
-typedef uint32_t gdb_time_t;
-
-struct nios2_gdb_stat {
- uint32_t gdb_st_dev; /* device */
- uint32_t gdb_st_ino; /* inode */
- gdb_mode_t gdb_st_mode; /* protection */
- uint32_t gdb_st_nlink; /* number of hard links */
- uint32_t gdb_st_uid; /* user ID of owner */
- uint32_t gdb_st_gid; /* group ID of owner */
- uint32_t gdb_st_rdev; /* device type (if inode device) */
- uint64_t gdb_st_size; /* total size, in bytes */
- uint64_t gdb_st_blksize; /* blocksize for filesystem I/O */
- uint64_t gdb_st_blocks; /* number of blocks allocated */
- gdb_time_t gdb_st_atime; /* time of last access */
- gdb_time_t gdb_st_mtime; /* time of last modification */
- gdb_time_t gdb_st_ctime; /* time of last change */
-} QEMU_PACKED;
-
-struct gdb_timeval {
- gdb_time_t tv_sec; /* second */
- uint64_t tv_usec; /* microsecond */
-} QEMU_PACKED;
-
static int translate_openflags(int flags)
{
int hf;
@@ -102,9 +78,9 @@ static int translate_openflags(int flags)
static bool translate_stat(CPUNios2State *env, target_ulong addr,
struct stat *s)
{
- struct nios2_gdb_stat *p;
+ struct gdb_stat *p;
- p = lock_user(VERIFY_WRITE, addr, sizeof(struct nios2_gdb_stat), 0);
+ p = lock_user(VERIFY_WRITE, addr, sizeof(struct gdb_stat), 0);
if (!p) {
return false;
@@ -128,7 +104,7 @@ static bool translate_stat(CPUNios2State *env, target_ulong addr,
p->gdb_st_atime = cpu_to_be32(s->st_atime);
p->gdb_st_mtime = cpu_to_be32(s->st_mtime);
p->gdb_st_ctime = cpu_to_be32(s->st_ctime);
- unlock_user(p, addr, sizeof(struct nios2_gdb_stat));
+ unlock_user(p, addr, sizeof(struct gdb_stat));
return true;
}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 14/43] semihosting: Use struct gdb_stat in common_semi_flen_cb
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (12 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 13/43] include/exec: Move gdb_stat and gdb_timeval " Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 15/43] semihosting: Split is_64bit_semihosting per target Richard Henderson
` (29 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
Use offsetof instead of an integer constant.
Load the entire 64-bit size while we're at it.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
semihosting/arm-compat-semi.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index a1fc4ea039..a6c6e5baf6 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -324,12 +324,12 @@ static target_ulong common_semi_flen_buf(CPUState *cs)
static void
common_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
{
- /* The size is always stored in big-endian order, extract
- the value. We assume the size always fit in 32 bits. */
- uint32_t size;
- cpu_memory_rw_debug(cs, common_semi_flen_buf(cs) + 32,
- (uint8_t *)&size, 4, 0);
- size = be32_to_cpu(size);
+ /* The size is always stored in big-endian order, extract the value. */
+ uint64_t size;
+ cpu_memory_rw_debug(cs, common_semi_flen_buf(cs) +
+ offsetof(struct gdb_stat, gdb_st_size),
+ &size, 8, 0);
+ size = be64_to_cpu(size);
common_semi_cb(cs, -1, err);
common_semi_set_ret(cs, size);
}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 15/43] semihosting: Split is_64bit_semihosting per target
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (13 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 14/43] semihosting: Use struct gdb_stat in common_semi_flen_cb Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 16/43] semihosting: Split common_semi_flen_buf " Richard Henderson
` (28 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
We already have some larger ifdef blocks for ARM and RISCV;
split the function into multiple implementations per arch.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
semihosting/arm-compat-semi.c | 19 ++++++++-----------
1 file changed, 8 insertions(+), 11 deletions(-)
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index a6c6e5baf6..7fc60e223a 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -213,6 +213,10 @@ common_semi_sys_exit_extended(CPUState *cs, int nr)
return (nr == TARGET_SYS_EXIT_EXTENDED || is_a64(cs->env_ptr));
}
+static inline bool is_64bit_semihosting(CPUArchState *env)
+{
+ return is_a64(env);
+}
#endif /* TARGET_ARM */
#ifdef TARGET_RISCV
@@ -238,6 +242,10 @@ common_semi_sys_exit_extended(CPUState *cs, int nr)
return (nr == TARGET_SYS_EXIT_EXTENDED || sizeof(target_ulong) == 8);
}
+static inline bool is_64bit_semihosting(CPUArchState *env)
+{
+ return riscv_cpu_mxl(env) != MXL_RV32;
+}
#endif
/*
@@ -586,17 +594,6 @@ static const GuestFDFunctions guestfd_fns[] = {
* call if the memory read fails. Eventually we could use a generic
* CPUState helper function here.
*/
-static inline bool is_64bit_semihosting(CPUArchState *env)
-{
-#if defined(TARGET_ARM)
- return is_a64(env);
-#elif defined(TARGET_RISCV)
- return riscv_cpu_mxl(env) != MXL_RV32;
-#else
-#error un-handled architecture
-#endif
-}
-
#define GET_ARG(n) do { \
if (is_64bit_semihosting(env)) { \
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 16/43] semihosting: Split common_semi_flen_buf per target
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (14 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 15/43] semihosting: Split is_64bit_semihosting per target Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 17/43] semihosting: Split out common_semi_has_synccache Richard Henderson
` (27 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
We already have some larger ifdef blocks for ARM and RISCV;
split out common_semi_stack_bottom per target.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
semihosting/arm-compat-semi.c | 44 +++++++++++++++++------------------
1 file changed, 21 insertions(+), 23 deletions(-)
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index 7fc60e223a..b2816e9f66 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -217,6 +217,13 @@ static inline bool is_64bit_semihosting(CPUArchState *env)
{
return is_a64(env);
}
+
+static inline target_ulong common_semi_stack_bottom(CPUState *cs)
+{
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
+ return is_a64(env) ? env->xregs[31] : env->regs[13];
+}
#endif /* TARGET_ARM */
#ifdef TARGET_RISCV
@@ -246,6 +253,13 @@ static inline bool is_64bit_semihosting(CPUArchState *env)
{
return riscv_cpu_mxl(env) != MXL_RV32;
}
+
+static inline target_ulong common_semi_stack_bottom(CPUState *cs)
+{
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+ return env->gpr[xSP];
+}
#endif
/*
@@ -301,31 +315,15 @@ static void common_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
common_semi_set_ret(cs, ret);
}
+/*
+ * Return an address in target memory of 64 bytes where the remote
+ * gdb should write its stat struct. (The format of this structure
+ * is defined by GDB's remote protocol and is not target-specific.)
+ * We put this on the guest's stack just below SP.
+ */
static target_ulong common_semi_flen_buf(CPUState *cs)
{
- target_ulong sp;
-#ifdef TARGET_ARM
- /* Return an address in target memory of 64 bytes where the remote
- * gdb should write its stat struct. (The format of this structure
- * is defined by GDB's remote protocol and is not target-specific.)
- * We put this on the guest's stack just below SP.
- */
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
-
- if (is_a64(env)) {
- sp = env->xregs[31];
- } else {
- sp = env->regs[13];
- }
-#endif
-#ifdef TARGET_RISCV
- RISCVCPU *cpu = RISCV_CPU(cs);
- CPURISCVState *env = &cpu->env;
-
- sp = env->gpr[xSP];
-#endif
-
+ target_ulong sp = common_semi_stack_bottom(cs);
return sp - 64;
}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 17/43] semihosting: Split out common_semi_has_synccache
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (15 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 16/43] semihosting: Split common_semi_flen_buf " Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 18/43] semihosting: Use env more often in do_common_semihosting Richard Henderson
` (26 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
We already have some larger ifdef blocks for ARM and RISCV;
split out a boolean test for SYS_SYNCCACHE.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
semihosting/arm-compat-semi.c | 20 +++++++++++++-------
1 file changed, 13 insertions(+), 7 deletions(-)
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index b2816e9f66..6149be404f 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -224,6 +224,12 @@ static inline target_ulong common_semi_stack_bottom(CPUState *cs)
CPUARMState *env = &cpu->env;
return is_a64(env) ? env->xregs[31] : env->regs[13];
}
+
+static inline bool common_semi_has_synccache(CPUArchState *env)
+{
+ /* Invalid for A32/T32. */
+ return !is_a64(env);
+}
#endif /* TARGET_ARM */
#ifdef TARGET_RISCV
@@ -260,6 +266,11 @@ static inline target_ulong common_semi_stack_bottom(CPUState *cs)
CPURISCVState *env = &cpu->env;
return env->gpr[xSP];
}
+
+static inline bool common_semi_has_synccache(CPUArchState *env)
+{
+ return true;
+}
#endif
/*
@@ -1103,16 +1114,11 @@ void do_common_semihosting(CPUState *cs)
* virtual address range. This is a nop for us since we don't
* implement caches. This is only present on A64.
*/
-#ifdef TARGET_ARM
- if (is_a64(cs->env_ptr)) {
+ if (common_semi_has_synccache(env)) {
common_semi_set_ret(cs, 0);
break;
}
-#endif
-#ifdef TARGET_RISCV
- common_semi_set_ret(cs, 0);
-#endif
- /* fall through -- invalid for A32/T32 */
+ /* fall through */
default:
fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
cpu_dump_state(cs, stderr, 0);
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 18/43] semihosting: Use env more often in do_common_semihosting
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (16 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 17/43] semihosting: Split out common_semi_has_synccache Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 19/43] semihosting: Move GET_ARG/SET_ARG earlier in the file Richard Henderson
` (25 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
We've already loaded cs->env_ptr into a local variable; use it.
Since env is unconditionally used, we don't need a dummy use.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/arm/common-semi-target.h | 62 ++++++++++++++++++
target/riscv/common-semi-target.h | 50 +++++++++++++++
semihosting/arm-compat-semi.c | 101 ++----------------------------
3 files changed, 116 insertions(+), 97 deletions(-)
create mode 100644 target/arm/common-semi-target.h
create mode 100644 target/riscv/common-semi-target.h
diff --git a/target/arm/common-semi-target.h b/target/arm/common-semi-target.h
new file mode 100644
index 0000000000..c20e1cca76
--- /dev/null
+++ b/target/arm/common-semi-target.h
@@ -0,0 +1,62 @@
+/*
+ * Target-specific parts of semihosting/arm-compat-semi.c.
+ *
+ * Copyright (c) 2005, 2007 CodeSourcery.
+ * Copyright (c) 2019, 2022 Linaro
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef TARGET_ARM_COMMON_SEMI_TARGET_H
+#define TARGET_ARM_COMMON_SEMI_TARGET_H
+
+#ifndef CONFIG_USER_ONLY
+#include "hw/arm/boot.h"
+#endif
+
+static inline target_ulong common_semi_arg(CPUState *cs, int argno)
+{
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
+ if (is_a64(env)) {
+ return env->xregs[argno];
+ } else {
+ return env->regs[argno];
+ }
+}
+
+static inline void common_semi_set_ret(CPUState *cs, target_ulong ret)
+{
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
+ if (is_a64(env)) {
+ env->xregs[0] = ret;
+ } else {
+ env->regs[0] = ret;
+ }
+}
+
+static inline bool common_semi_sys_exit_extended(CPUState *cs, int nr)
+{
+ return (nr == TARGET_SYS_EXIT_EXTENDED || is_a64(cs->env_ptr));
+}
+
+static inline bool is_64bit_semihosting(CPUArchState *env)
+{
+ return is_a64(env);
+}
+
+static inline target_ulong common_semi_stack_bottom(CPUState *cs)
+{
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
+ return is_a64(env) ? env->xregs[31] : env->regs[13];
+}
+
+static inline bool common_semi_has_synccache(CPUArchState *env)
+{
+ /* Invalid for A32/T32 */
+ return !is_a64(env);
+}
+
+#endif
diff --git a/target/riscv/common-semi-target.h b/target/riscv/common-semi-target.h
new file mode 100644
index 0000000000..7c8a59e0cc
--- /dev/null
+++ b/target/riscv/common-semi-target.h
@@ -0,0 +1,50 @@
+/*
+ * Target-specific parts of semihosting/arm-compat-semi.c.
+ *
+ * Copyright (c) 2005, 2007 CodeSourcery.
+ * Copyright (c) 2019, 2022 Linaro
+ * Copyright © 2020 by Keith Packard <keithp@keithp.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef TARGET_RISCV_COMMON_SEMI_TARGET_H
+#define TARGET_RISCV_COMMON_SEMI_TARGET_H
+
+static inline target_ulong common_semi_arg(CPUState *cs, int argno)
+{
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+ return env->gpr[xA0 + argno];
+}
+
+static inline void common_semi_set_ret(CPUState *cs, target_ulong ret)
+{
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+ env->gpr[xA0] = ret;
+}
+
+static inline bool common_semi_sys_exit_extended(CPUState *cs, int nr)
+{
+ return (nr == TARGET_SYS_EXIT_EXTENDED || sizeof(target_ulong) == 8);
+}
+
+static inline bool is_64bit_semihosting(CPUArchState *env)
+{
+ return riscv_cpu_mxl(env) != MXL_RV32;
+}
+
+static inline target_ulong common_semi_stack_bottom(CPUState *cs)
+{
+ RISCVCPU *cpu = RISCV_CPU(cs);
+ CPURISCVState *env = &cpu->env;
+ return env->gpr[xSP];
+}
+
+static inline bool common_semi_has_synccache(CPUArchState *env)
+{
+ return true;
+}
+
+#endif
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index 6149be404f..3a740482f9 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -46,9 +46,6 @@
#else
#include "qemu/cutils.h"
#include "hw/loader.h"
-#ifdef TARGET_ARM
-#include "hw/arm/boot.h"
-#endif
#include "hw/boards.h"
#endif
@@ -182,96 +179,7 @@ static LayoutInfo common_semi_find_bases(CPUState *cs)
#endif
-#ifdef TARGET_ARM
-static inline target_ulong
-common_semi_arg(CPUState *cs, int argno)
-{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
- if (is_a64(env)) {
- return env->xregs[argno];
- } else {
- return env->regs[argno];
- }
-}
-
-static inline void
-common_semi_set_ret(CPUState *cs, target_ulong ret)
-{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
- if (is_a64(env)) {
- env->xregs[0] = ret;
- } else {
- env->regs[0] = ret;
- }
-}
-
-static inline bool
-common_semi_sys_exit_extended(CPUState *cs, int nr)
-{
- return (nr == TARGET_SYS_EXIT_EXTENDED || is_a64(cs->env_ptr));
-}
-
-static inline bool is_64bit_semihosting(CPUArchState *env)
-{
- return is_a64(env);
-}
-
-static inline target_ulong common_semi_stack_bottom(CPUState *cs)
-{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
- return is_a64(env) ? env->xregs[31] : env->regs[13];
-}
-
-static inline bool common_semi_has_synccache(CPUArchState *env)
-{
- /* Invalid for A32/T32. */
- return !is_a64(env);
-}
-#endif /* TARGET_ARM */
-
-#ifdef TARGET_RISCV
-static inline target_ulong
-common_semi_arg(CPUState *cs, int argno)
-{
- RISCVCPU *cpu = RISCV_CPU(cs);
- CPURISCVState *env = &cpu->env;
- return env->gpr[xA0 + argno];
-}
-
-static inline void
-common_semi_set_ret(CPUState *cs, target_ulong ret)
-{
- RISCVCPU *cpu = RISCV_CPU(cs);
- CPURISCVState *env = &cpu->env;
- env->gpr[xA0] = ret;
-}
-
-static inline bool
-common_semi_sys_exit_extended(CPUState *cs, int nr)
-{
- return (nr == TARGET_SYS_EXIT_EXTENDED || sizeof(target_ulong) == 8);
-}
-
-static inline bool is_64bit_semihosting(CPUArchState *env)
-{
- return riscv_cpu_mxl(env) != MXL_RV32;
-}
-
-static inline target_ulong common_semi_stack_bottom(CPUState *cs)
-{
- RISCVCPU *cpu = RISCV_CPU(cs);
- CPURISCVState *env = &cpu->env;
- return env->gpr[xSP];
-}
-
-static inline bool common_semi_has_synccache(CPUArchState *env)
-{
- return true;
-}
-#endif
+#include "common-semi-target.h"
/*
* The semihosting API has no concept of its errno being thread-safe,
@@ -646,7 +554,6 @@ void do_common_semihosting(CPUState *cs)
GuestFD *gf;
int64_t elapsed;
- (void) env; /* Used implicitly by arm lock_user macro */
nr = common_semi_arg(cs, 0) & 0xffffffffU;
args = common_semi_arg(cs, 1);
@@ -729,12 +636,12 @@ void do_common_semihosting(CPUState *cs)
break;
case TARGET_SYS_WRITEC:
- qemu_semihosting_console_outc(cs->env_ptr, args);
+ qemu_semihosting_console_outc(env, args);
common_semi_set_ret(cs, 0xdeadbeef);
break;
case TARGET_SYS_WRITE0:
- ret = qemu_semihosting_console_outs(cs->env_ptr, args);
+ ret = qemu_semihosting_console_outs(env, args);
common_semi_set_ret(cs, ret);
break;
@@ -765,7 +672,7 @@ void do_common_semihosting(CPUState *cs)
break;
case TARGET_SYS_READC:
- ret = qemu_semihosting_console_inc(cs->env_ptr);
+ ret = qemu_semihosting_console_inc(env);
common_semi_set_ret(cs, ret);
break;
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 19/43] semihosting: Move GET_ARG/SET_ARG earlier in the file
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (17 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 18/43] semihosting: Use env more often in do_common_semihosting Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 20/43] semihosting: Split out semihost_sys_open Richard Henderson
` (24 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
Moving this to be useful for another function
besides do_common_semihosting.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
semihosting/arm-compat-semi.c | 52 +++++++++++++++++------------------
1 file changed, 26 insertions(+), 26 deletions(-)
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index 3a740482f9..49f976cbc5 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -181,6 +181,32 @@ static LayoutInfo common_semi_find_bases(CPUState *cs)
#include "common-semi-target.h"
+/*
+ * Read the input value from the argument block; fail the semihosting
+ * call if the memory read fails. Eventually we could use a generic
+ * CPUState helper function here.
+ */
+
+#define GET_ARG(n) do { \
+ if (is_64bit_semihosting(env)) { \
+ if (get_user_u64(arg ## n, args + (n) * 8)) { \
+ common_semi_cb(cs, -1, EFAULT); \
+ return; \
+ } \
+ } else { \
+ if (get_user_u32(arg ## n, args + (n) * 4)) { \
+ common_semi_cb(cs, -1, EFAULT); \
+ return; \
+ } \
+ } \
+} while (0)
+
+#define SET_ARG(n, val) \
+ (is_64bit_semihosting(env) ? \
+ put_user_u64(val, args + (n) * 8) : \
+ put_user_u32(val, args + (n) * 4))
+
+
/*
* The semihosting API has no concept of its errno being thread-safe,
* as the API design predates SMP CPUs and was intended as a simple
@@ -506,32 +532,6 @@ static const GuestFDFunctions guestfd_fns[] = {
},
};
-/*
- * Read the input value from the argument block; fail the semihosting
- * call if the memory read fails. Eventually we could use a generic
- * CPUState helper function here.
- */
-
-#define GET_ARG(n) do { \
- if (is_64bit_semihosting(env)) { \
- if (get_user_u64(arg ## n, args + (n) * 8)) { \
- common_semi_cb(cs, -1, EFAULT); \
- return; \
- } \
- } else { \
- if (get_user_u32(arg ## n, args + (n) * 4)) { \
- common_semi_cb(cs, -1, EFAULT); \
- return; \
- } \
- } \
-} while (0)
-
-#define SET_ARG(n, val) \
- (is_64bit_semihosting(env) ? \
- put_user_u64(val, args + (n) * 8) : \
- put_user_u32(val, args + (n) * 4))
-
-
/*
* Do a semihosting call.
*
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 20/43] semihosting: Split out semihost_sys_open
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (18 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 19/43] semihosting: Move GET_ARG/SET_ARG earlier in the file Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 21/43] semihosting: Split out semihost_sys_close Richard Henderson
` (23 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
Split out the non-ARM specific portions of SYS_OPEN to a
reusable function. This handles gdb and host file i/o.
Add helpers to validate the length of the filename string.
Prepare for usage by other semihosting by allowing the
filename length parameter to be 0, and calling strlen.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
include/semihosting/guestfd.h | 13 ++++
semihosting/arm-compat-semi.c | 49 +-----------
semihosting/guestfd.c | 135 ++++++++++++++++++++++++++++++++++
3 files changed, 152 insertions(+), 45 deletions(-)
diff --git a/include/semihosting/guestfd.h b/include/semihosting/guestfd.h
index 5aa2722cb2..275b91b73a 100644
--- a/include/semihosting/guestfd.h
+++ b/include/semihosting/guestfd.h
@@ -41,4 +41,17 @@ GuestFD *get_guestfd(int guestfd);
void associate_guestfd(int guestfd, int hostfd);
void staticfile_guestfd(int guestfd, const uint8_t *data, size_t len);
+/*
+ * Syscall implementations for semi-hosting. Argument loading from
+ * the guest is performed by the caller; results are returned via
+ * the 'complete' callback. String operands are in address/len pairs.
+ * The len argument may be 0 (when the semihosting abi does not
+ * already provide the length), or non-zero (where it should include
+ * the terminating zero).
+ */
+
+void semihost_sys_open(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong fname, target_ulong fname_len,
+ int gdb_flags, int mode);
+
#endif /* SEMIHOSTING_GUESTFD_H */
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index 49f976cbc5..e2decd54e4 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -35,9 +35,9 @@
#include "semihosting/semihost.h"
#include "semihosting/console.h"
#include "semihosting/common-semi.h"
-#include "semihosting/guestfd.h"
#include "qemu/timer.h"
#include "exec/gdbstub.h"
+#include "semihosting/guestfd.h"
#ifdef CONFIG_USER_ONLY
#include "qemu.h"
@@ -98,21 +98,6 @@ static int gdb_open_modeflags[12] = {
GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND | GDB_O_BINARY
};
-static int open_modeflags[12] = {
- O_RDONLY,
- O_RDONLY | O_BINARY,
- O_RDWR,
- O_RDWR | O_BINARY,
- O_WRONLY | O_CREAT | O_TRUNC,
- O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
- O_RDWR | O_CREAT | O_TRUNC,
- O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
- O_WRONLY | O_CREAT | O_APPEND,
- O_WRONLY | O_CREAT | O_APPEND | O_BINARY,
- O_RDWR | O_CREAT | O_APPEND,
- O_RDWR | O_CREAT | O_APPEND | O_BINARY
-};
-
#ifndef CONFIG_USER_ONLY
/**
@@ -285,20 +270,6 @@ common_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
common_semi_set_ret(cs, size);
}
-static int common_semi_open_guestfd;
-
-static void
-common_semi_open_cb(CPUState *cs, target_ulong ret, target_ulong err)
-{
- if (ret == (target_ulong)-1) {
- dealloc_guestfd(common_semi_open_guestfd);
- } else {
- associate_guestfd(common_semi_open_guestfd, ret);
- ret = common_semi_open_guestfd;
- }
- common_semi_cb(cs, ret, err);
-}
-
/*
* Types for functions implementing various semihosting calls
* for specific types of guest file descriptor. These must all
@@ -602,22 +573,10 @@ void do_common_semihosting(CPUState *cs)
staticfile_guestfd(ret, featurefile_data,
sizeof(featurefile_data));
}
- } else if (use_gdb_syscalls()) {
- unlock_user(s, arg0, 0);
- common_semi_open_guestfd = alloc_guestfd();
- gdb_do_syscall(common_semi_open_cb,
- "open,%s,%x,1a4", arg0, (int)arg2 + 1,
- gdb_open_modeflags[arg1]);
- break;
} else {
- hostfd = open(s, open_modeflags[arg1], 0644);
- if (hostfd < 0) {
- ret = -1;
- err = errno;
- } else {
- ret = alloc_guestfd();
- associate_guestfd(ret, hostfd);
- }
+ semihost_sys_open(cs, common_semi_cb, arg0, arg2 + 1,
+ gdb_open_modeflags[arg1], 0644);
+ break;
}
unlock_user(s, arg0, 0);
common_semi_cb(cs, ret, err);
diff --git a/semihosting/guestfd.c b/semihosting/guestfd.c
index b6405f5663..1393279333 100644
--- a/semihosting/guestfd.c
+++ b/semihosting/guestfd.c
@@ -11,6 +11,11 @@
#include "qemu/osdep.h"
#include "exec/gdbstub.h"
#include "semihosting/guestfd.h"
+#ifdef CONFIG_USER_ONLY
+#include "qemu.h"
+#else
+#include "semihosting/softmmu-uaccess.h"
+#endif
static GArray *guestfd_array;
@@ -116,3 +121,133 @@ void dealloc_guestfd(int guestfd)
assert(gf);
gf->type = GuestFDUnused;
}
+
+/*
+ * Validate or compute the length of the string (including terminator).
+ */
+static int validate_strlen(CPUState *cs, target_ulong str, target_ulong tlen)
+{
+ CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
+ char c;
+
+ if (tlen == 0) {
+ ssize_t slen = target_strlen(str);
+
+ if (slen < 0) {
+ return -EFAULT;
+ }
+ if (slen >= INT32_MAX) {
+ return -ENAMETOOLONG;
+ }
+ return slen + 1;
+ }
+ if (tlen > INT32_MAX) {
+ return -ENAMETOOLONG;
+ }
+ if (get_user_u8(c, str + tlen - 1)) {
+ return -EFAULT;
+ }
+ if (c != 0) {
+ return -EINVAL;
+ }
+ return tlen;
+}
+
+static int validate_lock_user_string(char **pstr, CPUState *cs,
+ target_ulong tstr, target_ulong tlen)
+{
+ int ret = validate_strlen(cs, tstr, tlen);
+ CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
+ char *str = NULL;
+
+ if (ret > 0) {
+ str = lock_user(VERIFY_READ, tstr, ret, true);
+ ret = str ? 0 : -EFAULT;
+ }
+ *pstr = str;
+ return ret;
+}
+
+/*
+ * File-related semihosting syscall implementations.
+ */
+
+static gdb_syscall_complete_cb gdb_open_complete;
+
+static void gdb_open_cb(CPUState *cs, target_ulong ret, target_ulong err)
+{
+ if (!err) {
+ int guestfd = alloc_guestfd();
+ associate_guestfd(guestfd, ret);
+ ret = guestfd;
+ }
+ gdb_open_complete(cs, ret, err);
+}
+
+static void gdb_open(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong fname, target_ulong fname_len,
+ int gdb_flags, int mode)
+{
+ int len = validate_strlen(cs, fname, fname_len);
+ if (len < 0) {
+ complete(cs, -1, -len);
+ return;
+ }
+
+ gdb_open_complete = complete;
+ gdb_do_syscall(gdb_open_cb, "open,%s,%x,%x",
+ fname, len, (target_ulong)gdb_flags, (target_ulong)mode);
+}
+
+static void host_open(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong fname, target_ulong fname_len,
+ int gdb_flags, int mode)
+{
+ CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
+ char *p;
+ int ret, host_flags;
+
+ ret = validate_lock_user_string(&p, cs, fname, fname_len);
+ if (ret < 0) {
+ complete(cs, -1, -ret);
+ return;
+ }
+
+ if (gdb_flags & GDB_O_WRONLY) {
+ host_flags = O_WRONLY;
+ } else if (gdb_flags & GDB_O_RDWR) {
+ host_flags = O_RDWR;
+ } else {
+ host_flags = O_RDONLY;
+ }
+ if (gdb_flags & GDB_O_CREAT) {
+ host_flags |= O_CREAT;
+ }
+ if (gdb_flags & GDB_O_TRUNC) {
+ host_flags |= O_TRUNC;
+ }
+ if (gdb_flags & GDB_O_EXCL) {
+ host_flags |= O_EXCL;
+ }
+
+ ret = open(p, host_flags, mode);
+ if (ret < 0) {
+ complete(cs, -1, errno);
+ } else {
+ int guestfd = alloc_guestfd();
+ associate_guestfd(guestfd, ret);
+ complete(cs, guestfd, 0);
+ }
+ unlock_user(p, fname, 0);
+}
+
+void semihost_sys_open(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong fname, target_ulong fname_len,
+ int gdb_flags, int mode)
+{
+ if (use_gdb_syscalls()) {
+ gdb_open(cs, complete, fname, fname_len, gdb_flags, mode);
+ } else {
+ host_open(cs, complete, fname, fname_len, gdb_flags, mode);
+ }
+}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 21/43] semihosting: Split out semihost_sys_close
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (19 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 20/43] semihosting: Split out semihost_sys_open Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 22/43] semihosting: Split out semihost_sys_read Richard Henderson
` (22 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
Split out the non-ARM specific portions of SYS_CLOSE to a
reusable function. This handles all GuestFD.
Note that gdb_do_syscall %x reads target_ulong, not int.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
include/semihosting/guestfd.h | 2 ++
semihosting/arm-compat-semi.c | 41 +-------------------------
semihosting/guestfd.c | 54 ++++++++++++++++++++++++++++++++++-
3 files changed, 56 insertions(+), 41 deletions(-)
diff --git a/include/semihosting/guestfd.h b/include/semihosting/guestfd.h
index 275b91b73a..c38b1d3657 100644
--- a/include/semihosting/guestfd.h
+++ b/include/semihosting/guestfd.h
@@ -54,4 +54,6 @@ void semihost_sys_open(CPUState *cs, gdb_syscall_complete_cb complete,
target_ulong fname, target_ulong fname_len,
int gdb_flags, int mode);
+void semihost_sys_close(CPUState *cs, gdb_syscall_complete_cb complete, int fd);
+
#endif /* SEMIHOSTING_GUESTFD_H */
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index e2decd54e4..f20e84c4f0 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -276,7 +276,6 @@ common_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
* do the work and return the required return value to the guest
* via common_semi_cb.
*/
-typedef void sys_closefn(CPUState *cs, GuestFD *gf);
typedef void sys_writefn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len);
typedef void sys_readfn(CPUState *cs, GuestFD *gf,
@@ -285,23 +284,6 @@ typedef void sys_isattyfn(CPUState *cs, GuestFD *gf);
typedef void sys_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset);
typedef void sys_flenfn(CPUState *cs, GuestFD *gf);
-static void host_closefn(CPUState *cs, GuestFD *gf)
-{
- int ret;
- /*
- * Only close the underlying host fd if it's one we opened on behalf
- * of the guest in SYS_OPEN.
- */
- if (gf->hostfd == STDIN_FILENO ||
- gf->hostfd == STDOUT_FILENO ||
- gf->hostfd == STDERR_FILENO) {
- ret = 0;
- } else {
- ret = close(gf->hostfd);
- }
- common_semi_cb(cs, ret, ret ? errno : 0);
-}
-
static void host_writefn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
@@ -362,11 +344,6 @@ static void host_flenfn(CPUState *cs, GuestFD *gf)
}
}
-static void gdb_closefn(CPUState *cs, GuestFD *gf)
-{
- gdb_do_syscall(common_semi_cb, "close,%x", gf->hostfd);
-}
-
static void gdb_writefn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
@@ -414,12 +391,6 @@ static const uint8_t featurefile_data[] = {
SH_EXT_EXIT_EXTENDED | SH_EXT_STDOUT_STDERR, /* Feature byte 0 */
};
-static void staticfile_closefn(CPUState *cs, GuestFD *gf)
-{
- /* Nothing to do */
- common_semi_cb(cs, 0, 0);
-}
-
static void staticfile_writefn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len)
{
@@ -468,7 +439,6 @@ static void staticfile_flenfn(CPUState *cs, GuestFD *gf)
}
typedef struct GuestFDFunctions {
- sys_closefn *closefn;
sys_writefn *writefn;
sys_readfn *readfn;
sys_isattyfn *isattyfn;
@@ -478,7 +448,6 @@ typedef struct GuestFDFunctions {
static const GuestFDFunctions guestfd_fns[] = {
[GuestFDHost] = {
- .closefn = host_closefn,
.writefn = host_writefn,
.readfn = host_readfn,
.isattyfn = host_isattyfn,
@@ -486,7 +455,6 @@ static const GuestFDFunctions guestfd_fns[] = {
.flenfn = host_flenfn,
},
[GuestFDGDB] = {
- .closefn = gdb_closefn,
.writefn = gdb_writefn,
.readfn = gdb_readfn,
.isattyfn = gdb_isattyfn,
@@ -494,7 +462,6 @@ static const GuestFDFunctions guestfd_fns[] = {
.flenfn = gdb_flenfn,
},
[GuestFDStatic] = {
- .closefn = staticfile_closefn,
.writefn = staticfile_writefn,
.readfn = staticfile_readfn,
.isattyfn = staticfile_isattyfn,
@@ -585,13 +552,7 @@ void do_common_semihosting(CPUState *cs)
case TARGET_SYS_CLOSE:
GET_ARG(0);
-
- gf = get_guestfd(arg0);
- if (!gf) {
- goto do_badf;
- }
- guestfd_fns[gf->type].closefn(cs, gf);
- dealloc_guestfd(arg0);
+ semihost_sys_close(cs, common_semi_cb, arg0);
break;
case TARGET_SYS_WRITEC:
diff --git a/semihosting/guestfd.c b/semihosting/guestfd.c
index 1393279333..c26b1c677e 100644
--- a/semihosting/guestfd.c
+++ b/semihosting/guestfd.c
@@ -49,6 +49,11 @@ int alloc_guestfd(void)
return i;
}
+static void do_dealloc_guestfd(GuestFD *gf)
+{
+ gf->type = GuestFDUnused;
+}
+
/*
* Look up the guestfd in the data structure; return NULL
* for out of bounds, but don't check whether the slot is unused.
@@ -119,7 +124,7 @@ void dealloc_guestfd(int guestfd)
GuestFD *gf = do_get_guestfd(guestfd);
assert(gf);
- gf->type = GuestFDUnused;
+ do_dealloc_guestfd(gf);
}
/*
@@ -251,3 +256,50 @@ void semihost_sys_open(CPUState *cs, gdb_syscall_complete_cb complete,
host_open(cs, complete, fname, fname_len, gdb_flags, mode);
}
}
+
+static void gdb_close(CPUState *cs, gdb_syscall_complete_cb complete,
+ GuestFD *gf)
+{
+ gdb_do_syscall(complete, "close,%x", (target_ulong)gf->hostfd);
+}
+
+static void host_close(CPUState *cs, gdb_syscall_complete_cb complete,
+ GuestFD *gf)
+{
+ /*
+ * Only close the underlying host fd if it's one we opened on behalf
+ * of the guest in SYS_OPEN.
+ */
+ if (gf->hostfd != STDIN_FILENO &&
+ gf->hostfd != STDOUT_FILENO &&
+ gf->hostfd != STDERR_FILENO &&
+ close(gf->hostfd) < 0) {
+ complete(cs, -1, errno);
+ } else {
+ complete(cs, 0, 0);
+ }
+}
+
+void semihost_sys_close(CPUState *cs, gdb_syscall_complete_cb complete, int fd)
+{
+ GuestFD *gf = get_guestfd(fd);
+
+ if (!gf) {
+ complete(cs, -1, EBADF);
+ return;
+ }
+ switch (gf->type) {
+ case GuestFDGDB:
+ gdb_close(cs, complete, gf);
+ break;
+ case GuestFDHost:
+ host_close(cs, complete, gf);
+ break;
+ case GuestFDStatic:
+ complete(cs, 0, 0);
+ break;
+ default:
+ g_assert_not_reached();
+ }
+ do_dealloc_guestfd(gf);
+}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 22/43] semihosting: Split out semihost_sys_read
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (20 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 21/43] semihosting: Split out semihost_sys_close Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 23/43] semihosting: Split out semihost_sys_write Richard Henderson
` (21 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
Split out the non-ARM specific portions of SYS_READ to a
reusable function. This handles all GuestFD. Isolate the
curious ARM-specific return value processing to a new
callback, common_semi_rw_cb.
Note that gdb_do_syscall %x reads target_ulong, not int.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
include/semihosting/guestfd.h | 3 ++
semihosting/arm-compat-semi.c | 84 ++++++++---------------------------
semihosting/guestfd.c | 75 +++++++++++++++++++++++++++++++
3 files changed, 97 insertions(+), 65 deletions(-)
diff --git a/include/semihosting/guestfd.h b/include/semihosting/guestfd.h
index c38b1d3657..568d55fd32 100644
--- a/include/semihosting/guestfd.h
+++ b/include/semihosting/guestfd.h
@@ -56,4 +56,7 @@ void semihost_sys_open(CPUState *cs, gdb_syscall_complete_cb complete,
void semihost_sys_close(CPUState *cs, gdb_syscall_complete_cb complete, int fd);
+void semihost_sys_read(CPUState *cs, gdb_syscall_complete_cb complete,
+ int fd, target_ulong buf, target_ulong len);
+
#endif /* SEMIHOSTING_GUESTFD_H */
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index f20e84c4f0..2c6c2dd0d0 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -232,7 +232,6 @@ static void common_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
target_ulong reg0 = common_semi_arg(cs, 0);
switch (reg0) {
case TARGET_SYS_WRITE:
- case TARGET_SYS_READ:
ret = common_semi_syscall_len - ret;
break;
case TARGET_SYS_SEEK:
@@ -245,6 +244,24 @@ static void common_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
common_semi_set_ret(cs, ret);
}
+/*
+ * SYS_READ and SYS_WRITE always return the number of bytes not read/written.
+ * There is no error condition, other than returning the original length.
+ */
+static void common_semi_rw_cb(CPUState *cs, target_ulong ret, target_ulong err)
+{
+ /* Recover the original length from the third argument. */
+ CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
+ target_ulong args = common_semi_arg(cs, 1);
+ target_ulong arg2;
+ GET_ARG(2);
+
+ if (err) {
+ ret = 0; /* error: no bytes transmitted */
+ }
+ common_semi_set_ret(cs, arg2 - ret);
+}
+
/*
* Return an address in target memory of 64 bytes where the remote
* gdb should write its stat struct. (The format of this structure
@@ -278,8 +295,6 @@ common_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
*/
typedef void sys_writefn(CPUState *cs, GuestFD *gf,
target_ulong buf, uint32_t len);
-typedef void sys_readfn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len);
typedef void sys_isattyfn(CPUState *cs, GuestFD *gf);
typedef void sys_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset);
typedef void sys_flenfn(CPUState *cs, GuestFD *gf);
@@ -302,26 +317,6 @@ static void host_writefn(CPUState *cs, GuestFD *gf,
common_semi_cb(cs, len - ret, 0);
}
-static void host_readfn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
-{
- CPUArchState *env = cs->env_ptr;
- uint32_t ret = 0;
- char *s = lock_user(VERIFY_WRITE, buf, len, 0);
- (void) env; /* Used in arm softmmu lock_user implicitly */
- if (s) {
- do {
- ret = read(gf->hostfd, s, len);
- } while (ret == -1 && errno == EINTR);
- unlock_user(s, buf, len);
- if (ret == (uint32_t)-1) {
- ret = 0;
- }
- }
- /* Return bytes not read, on error as well. */
- common_semi_cb(cs, len - ret, 0);
-}
-
static void host_isattyfn(CPUState *cs, GuestFD *gf)
{
common_semi_cb(cs, isatty(gf->hostfd), 0);
@@ -351,13 +346,6 @@ static void gdb_writefn(CPUState *cs, GuestFD *gf,
gdb_do_syscall(common_semi_cb, "write,%x,%x,%x", gf->hostfd, buf, len);
}
-static void gdb_readfn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
-{
- common_semi_syscall_len = len;
- gdb_do_syscall(common_semi_cb, "read,%x,%x,%x", gf->hostfd, buf, len);
-}
-
static void gdb_isattyfn(CPUState *cs, GuestFD *gf)
{
gdb_do_syscall(common_semi_cb, "isatty,%x", gf->hostfd);
@@ -398,30 +386,6 @@ static void staticfile_writefn(CPUState *cs, GuestFD *gf,
common_semi_cb(cs, -1, EBADF);
}
-static void staticfile_readfn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
-{
- CPUArchState *env = cs->env_ptr;
- uint32_t i = 0;
- char *s;
-
- (void) env; /* Used in arm softmmu lock_user implicitly */
- s = lock_user(VERIFY_WRITE, buf, len, 0);
- if (s) {
- for (i = 0; i < len; i++) {
- if (gf->staticfile.off >= gf->staticfile.len) {
- break;
- }
- s[i] = gf->staticfile.data[gf->staticfile.off];
- gf->staticfile.off++;
- }
- unlock_user(s, buf, len);
- }
-
- /* Return number of bytes not read */
- common_semi_cb(cs, len - i, 0);
-}
-
static void staticfile_isattyfn(CPUState *cs, GuestFD *gf)
{
common_semi_cb(cs, 0, 0);
@@ -440,7 +404,6 @@ static void staticfile_flenfn(CPUState *cs, GuestFD *gf)
typedef struct GuestFDFunctions {
sys_writefn *writefn;
- sys_readfn *readfn;
sys_isattyfn *isattyfn;
sys_seekfn *seekfn;
sys_flenfn *flenfn;
@@ -449,21 +412,18 @@ typedef struct GuestFDFunctions {
static const GuestFDFunctions guestfd_fns[] = {
[GuestFDHost] = {
.writefn = host_writefn,
- .readfn = host_readfn,
.isattyfn = host_isattyfn,
.seekfn = host_seekfn,
.flenfn = host_flenfn,
},
[GuestFDGDB] = {
.writefn = gdb_writefn,
- .readfn = gdb_readfn,
.isattyfn = gdb_isattyfn,
.seekfn = gdb_seekfn,
.flenfn = gdb_flenfn,
},
[GuestFDStatic] = {
.writefn = staticfile_writefn,
- .readfn = staticfile_readfn,
.isattyfn = staticfile_isattyfn,
.seekfn = staticfile_seekfn,
.flenfn = staticfile_flenfn,
@@ -582,13 +542,7 @@ void do_common_semihosting(CPUState *cs)
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
- len = arg2;
-
- gf = get_guestfd(arg0);
- if (!gf) {
- goto do_badf;
- }
- guestfd_fns[gf->type].readfn(cs, gf, arg1, len);
+ semihost_sys_read(cs, common_semi_rw_cb, arg0, arg1, arg2);
break;
case TARGET_SYS_READC:
diff --git a/semihosting/guestfd.c b/semihosting/guestfd.c
index c26b1c677e..057e384d65 100644
--- a/semihosting/guestfd.c
+++ b/semihosting/guestfd.c
@@ -303,3 +303,78 @@ void semihost_sys_close(CPUState *cs, gdb_syscall_complete_cb complete, int fd)
}
do_dealloc_guestfd(gf);
}
+
+static void gdb_read(CPUState *cs, gdb_syscall_complete_cb complete,
+ GuestFD *gf, target_ulong buf, target_ulong len)
+{
+ gdb_do_syscall(complete, "read,%x,%x,%x",
+ (target_ulong)gf->hostfd, buf, len);
+}
+
+static void host_read(CPUState *cs, gdb_syscall_complete_cb complete,
+ GuestFD *gf, target_ulong buf, target_ulong len)
+{
+ CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
+ void *ptr = lock_user(VERIFY_WRITE, buf, len, 0);
+ ssize_t ret;
+
+ if (!ptr) {
+ complete(cs, -1, EFAULT);
+ return;
+ }
+ do {
+ ret = read(gf->hostfd, ptr, len);
+ } while (ret == -1 && errno == EINTR);
+ if (ret == -1) {
+ complete(cs, -1, errno);
+ unlock_user(ptr, buf, 0);
+ } else {
+ complete(cs, ret, 0);
+ unlock_user(ptr, buf, ret);
+ }
+}
+
+static void staticfile_read(CPUState *cs, gdb_syscall_complete_cb complete,
+ GuestFD *gf, target_ulong buf, target_ulong len)
+{
+ CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
+ target_ulong rest = gf->staticfile.len - gf->staticfile.off;
+ void *ptr;
+
+ if (len > rest) {
+ len = rest;
+ }
+ ptr = lock_user(VERIFY_WRITE, buf, len, 0);
+ if (!ptr) {
+ complete(cs, -1, EFAULT);
+ return;
+ }
+ memcpy(ptr, gf->staticfile.data + gf->staticfile.off, len);
+ gf->staticfile.off += len;
+ complete(cs, len, 0);
+ unlock_user(ptr, buf, len);
+}
+
+void semihost_sys_read(CPUState *cs, gdb_syscall_complete_cb complete,
+ int fd, target_ulong buf, target_ulong len)
+{
+ GuestFD *gf = get_guestfd(fd);
+
+ if (!gf) {
+ complete(cs, -1, EBADF);
+ return;
+ }
+ switch (gf->type) {
+ case GuestFDGDB:
+ gdb_read(cs, complete, gf, buf, len);
+ break;
+ case GuestFDHost:
+ host_read(cs, complete, gf, buf, len);
+ break;
+ case GuestFDStatic:
+ staticfile_read(cs, complete, gf, buf, len);
+ break;
+ default:
+ g_assert_not_reached();
+ }
+}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 23/43] semihosting: Split out semihost_sys_write
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (21 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 22/43] semihosting: Split out semihost_sys_read Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 24/43] semihosting: Bound length for semihost_sys_{read, write} Richard Henderson
` (20 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
Split out the non-ARM specific portions of SYS_WRITE to a
reusable function. This handles all GuestFD. This removes
the last use of common_semi_syscall_len.
Note that gdb_do_syscall %x reads target_ulong, not int.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
include/semihosting/guestfd.h | 3 ++
semihosting/arm-compat-semi.c | 52 +----------------------------------
semihosting/guestfd.c | 48 ++++++++++++++++++++++++++++++++
3 files changed, 52 insertions(+), 51 deletions(-)
diff --git a/include/semihosting/guestfd.h b/include/semihosting/guestfd.h
index 568d55fd32..5780ea2f13 100644
--- a/include/semihosting/guestfd.h
+++ b/include/semihosting/guestfd.h
@@ -59,4 +59,7 @@ void semihost_sys_close(CPUState *cs, gdb_syscall_complete_cb complete, int fd);
void semihost_sys_read(CPUState *cs, gdb_syscall_complete_cb complete,
int fd, target_ulong buf, target_ulong len);
+void semihost_sys_write(CPUState *cs, gdb_syscall_complete_cb complete,
+ int fd, target_ulong buf, target_ulong len);
+
#endif /* SEMIHOSTING_GUESTFD_H */
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index 2c6c2dd0d0..6568d205eb 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -216,8 +216,6 @@ static inline uint32_t get_swi_errno(CPUState *cs)
#endif
}
-static target_ulong common_semi_syscall_len;
-
static void common_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
{
if (err) {
@@ -231,9 +229,6 @@ static void common_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
/* Fixup syscalls that use nonstardard return conventions. */
target_ulong reg0 = common_semi_arg(cs, 0);
switch (reg0) {
- case TARGET_SYS_WRITE:
- ret = common_semi_syscall_len - ret;
- break;
case TARGET_SYS_SEEK:
ret = 0;
break;
@@ -293,30 +288,10 @@ common_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
* do the work and return the required return value to the guest
* via common_semi_cb.
*/
-typedef void sys_writefn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len);
typedef void sys_isattyfn(CPUState *cs, GuestFD *gf);
typedef void sys_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset);
typedef void sys_flenfn(CPUState *cs, GuestFD *gf);
-static void host_writefn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
-{
- CPUArchState *env = cs->env_ptr;
- uint32_t ret = 0;
- char *s = lock_user(VERIFY_READ, buf, len, 1);
- (void) env; /* Used in arm softmmu lock_user implicitly */
- if (s) {
- ret = write(gf->hostfd, s, len);
- unlock_user(s, buf, 0);
- if (ret == (uint32_t)-1) {
- ret = 0;
- }
- }
- /* Return bytes not written, on error as well. */
- common_semi_cb(cs, len - ret, 0);
-}
-
static void host_isattyfn(CPUState *cs, GuestFD *gf)
{
common_semi_cb(cs, isatty(gf->hostfd), 0);
@@ -339,13 +314,6 @@ static void host_flenfn(CPUState *cs, GuestFD *gf)
}
}
-static void gdb_writefn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
-{
- common_semi_syscall_len = len;
- gdb_do_syscall(common_semi_cb, "write,%x,%x,%x", gf->hostfd, buf, len);
-}
-
static void gdb_isattyfn(CPUState *cs, GuestFD *gf)
{
gdb_do_syscall(common_semi_cb, "isatty,%x", gf->hostfd);
@@ -379,13 +347,6 @@ static const uint8_t featurefile_data[] = {
SH_EXT_EXIT_EXTENDED | SH_EXT_STDOUT_STDERR, /* Feature byte 0 */
};
-static void staticfile_writefn(CPUState *cs, GuestFD *gf,
- target_ulong buf, uint32_t len)
-{
- /* This fd can never be open for writing */
- common_semi_cb(cs, -1, EBADF);
-}
-
static void staticfile_isattyfn(CPUState *cs, GuestFD *gf)
{
common_semi_cb(cs, 0, 0);
@@ -403,7 +364,6 @@ static void staticfile_flenfn(CPUState *cs, GuestFD *gf)
}
typedef struct GuestFDFunctions {
- sys_writefn *writefn;
sys_isattyfn *isattyfn;
sys_seekfn *seekfn;
sys_flenfn *flenfn;
@@ -411,19 +371,16 @@ typedef struct GuestFDFunctions {
static const GuestFDFunctions guestfd_fns[] = {
[GuestFDHost] = {
- .writefn = host_writefn,
.isattyfn = host_isattyfn,
.seekfn = host_seekfn,
.flenfn = host_flenfn,
},
[GuestFDGDB] = {
- .writefn = gdb_writefn,
.isattyfn = gdb_isattyfn,
.seekfn = gdb_seekfn,
.flenfn = gdb_flenfn,
},
[GuestFDStatic] = {
- .writefn = staticfile_writefn,
.isattyfn = staticfile_isattyfn,
.seekfn = staticfile_seekfn,
.flenfn = staticfile_flenfn,
@@ -448,7 +405,6 @@ void do_common_semihosting(CPUState *cs)
char * s;
int nr;
uint32_t ret;
- uint32_t len;
GuestFD *gf;
int64_t elapsed;
@@ -529,13 +485,7 @@ void do_common_semihosting(CPUState *cs)
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
- len = arg2;
-
- gf = get_guestfd(arg0);
- if (!gf) {
- goto do_badf;
- }
- guestfd_fns[gf->type].writefn(cs, gf, arg1, len);
+ semihost_sys_write(cs, common_semi_rw_cb, arg0, arg1, arg2);
break;
case TARGET_SYS_READ:
diff --git a/semihosting/guestfd.c b/semihosting/guestfd.c
index 057e384d65..42efd2c558 100644
--- a/semihosting/guestfd.c
+++ b/semihosting/guestfd.c
@@ -378,3 +378,51 @@ void semihost_sys_read(CPUState *cs, gdb_syscall_complete_cb complete,
g_assert_not_reached();
}
}
+
+static void gdb_write(CPUState *cs, gdb_syscall_complete_cb complete,
+ GuestFD *gf, target_ulong buf, target_ulong len)
+{
+ gdb_do_syscall(complete, "write,%x,%x,%x",
+ (target_ulong)gf->hostfd, buf, len);
+}
+
+static void host_write(CPUState *cs, gdb_syscall_complete_cb complete,
+ GuestFD *gf, target_ulong buf, target_ulong len)
+{
+ CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
+ void *ptr = lock_user(VERIFY_READ, buf, len, 1);
+ ssize_t ret;
+
+ if (!ptr) {
+ complete(cs, -1, EFAULT);
+ return;
+ }
+ ret = write(gf->hostfd, ptr, len);
+ complete(cs, ret, ret == -1 ? errno : 0);
+ unlock_user(ptr, buf, 0);
+}
+
+void semihost_sys_write(CPUState *cs, gdb_syscall_complete_cb complete,
+ int fd, target_ulong buf, target_ulong len)
+{
+ GuestFD *gf = get_guestfd(fd);
+
+ if (!gf) {
+ goto ebadf;
+ }
+ switch (gf->type) {
+ case GuestFDGDB:
+ gdb_write(cs, complete, gf, buf, len);
+ break;
+ case GuestFDHost:
+ host_write(cs, complete, gf, buf, len);
+ break;
+ case GuestFDStatic:
+ ebadf:
+ /* Static files are never open for writing: EBADF. */
+ complete(cs, -1, EBADF);
+ break;
+ default:
+ g_assert_not_reached();
+ }
+}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 24/43] semihosting: Bound length for semihost_sys_{read, write}
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (22 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 23/43] semihosting: Split out semihost_sys_write Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 25/43] semihosting: Split out semihost_sys_lseek Richard Henderson
` (19 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
Fixes a minor bug in which a 64-bit guest on a 32-bit host could
truncate the length. This would only ever cause a problem if
there were no bits set in the low 32, so that it truncates to 0.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
semihosting/guestfd.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/semihosting/guestfd.c b/semihosting/guestfd.c
index 42efd2c558..356b87453c 100644
--- a/semihosting/guestfd.c
+++ b/semihosting/guestfd.c
@@ -364,6 +364,14 @@ void semihost_sys_read(CPUState *cs, gdb_syscall_complete_cb complete,
complete(cs, -1, EBADF);
return;
}
+ /*
+ * Bound length for 64-bit guests on 32-bit hosts, not overlowing ssize_t.
+ * Note the Linux kernel does this with MAX_RW_COUNT, so it's not a bad
+ * idea to do this unconditionally.
+ */
+ if (len > INT32_MAX) {
+ len = INT32_MAX;
+ }
switch (gf->type) {
case GuestFDGDB:
gdb_read(cs, complete, gf, buf, len);
@@ -410,6 +418,14 @@ void semihost_sys_write(CPUState *cs, gdb_syscall_complete_cb complete,
if (!gf) {
goto ebadf;
}
+ /*
+ * Bound length for 64-bit guests on 32-bit hosts, not overlowing ssize_t.
+ * Note the Linux kernel does this with MAX_RW_COUNT, so it's not a bad
+ * idea to do this unconditionally.
+ */
+ if (len > INT32_MAX) {
+ len = INT32_MAX;
+ }
switch (gf->type) {
case GuestFDGDB:
gdb_write(cs, complete, gf, buf, len);
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 25/43] semihosting: Split out semihost_sys_lseek
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (23 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 24/43] semihosting: Bound length for semihost_sys_{read, write} Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 26/43] semihosting: Split out semihost_sys_isatty Richard Henderson
` (18 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
Split out the non-ARM specific portions of SYS_SEEK to a
reusable function. This handles all GuestFD. Isolate the
curious ARM-specific return value processing to a new
callback, common_semi_seek_cb.
Expand the internal type of the offset to int64_t, and
provide the whence argument, which will be required by m68k
and nios2 semihosting.
Note that gdb_do_syscall %x reads target_ulong, not int.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
include/exec/gdbstub.h | 5 +++
include/semihosting/guestfd.h | 3 ++
semihosting/arm-compat-semi.c | 51 ++++++----------------
semihosting/guestfd.c | 81 +++++++++++++++++++++++++++++++++++
4 files changed, 102 insertions(+), 38 deletions(-)
diff --git a/include/exec/gdbstub.h b/include/exec/gdbstub.h
index 33a262a5a3..a7d3bfd5d4 100644
--- a/include/exec/gdbstub.h
+++ b/include/exec/gdbstub.h
@@ -20,6 +20,11 @@
#define GDB_O_TRUNC 0x400
#define GDB_O_EXCL 0x800
+/* For gdb file i/o remote protocol lseek whence. */
+#define GDB_SEEK_SET 0
+#define GDB_SEEK_CUR 1
+#define GDB_SEEK_END 2
+
/* For gdb file i/o stat/fstat. */
typedef uint32_t gdb_mode_t;
typedef uint32_t gdb_time_t;
diff --git a/include/semihosting/guestfd.h b/include/semihosting/guestfd.h
index 5780ea2f13..9c6967ac53 100644
--- a/include/semihosting/guestfd.h
+++ b/include/semihosting/guestfd.h
@@ -62,4 +62,7 @@ void semihost_sys_read(CPUState *cs, gdb_syscall_complete_cb complete,
void semihost_sys_write(CPUState *cs, gdb_syscall_complete_cb complete,
int fd, target_ulong buf, target_ulong len);
+void semihost_sys_lseek(CPUState *cs, gdb_syscall_complete_cb complete,
+ int fd, int64_t off, int gdb_whence);
+
#endif /* SEMIHOSTING_GUESTFD_H */
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index 6568d205eb..0cab721a50 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -225,16 +225,6 @@ static void common_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
#else
syscall_err = err;
#endif
- } else {
- /* Fixup syscalls that use nonstardard return conventions. */
- target_ulong reg0 = common_semi_arg(cs, 0);
- switch (reg0) {
- case TARGET_SYS_SEEK:
- ret = 0;
- break;
- default:
- break;
- }
}
common_semi_set_ret(cs, ret);
}
@@ -257,6 +247,18 @@ static void common_semi_rw_cb(CPUState *cs, target_ulong ret, target_ulong err)
common_semi_set_ret(cs, arg2 - ret);
}
+/*
+ * SYS_SEEK returns 0 on success, not the resulting offset.
+ */
+static void common_semi_seek_cb(CPUState *cs, target_ulong ret,
+ target_ulong err)
+{
+ if (!err) {
+ ret = 0;
+ }
+ common_semi_cb(cs, ret, err);
+}
+
/*
* Return an address in target memory of 64 bytes where the remote
* gdb should write its stat struct. (The format of this structure
@@ -289,7 +291,6 @@ common_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
* via common_semi_cb.
*/
typedef void sys_isattyfn(CPUState *cs, GuestFD *gf);
-typedef void sys_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset);
typedef void sys_flenfn(CPUState *cs, GuestFD *gf);
static void host_isattyfn(CPUState *cs, GuestFD *gf)
@@ -297,12 +298,6 @@ static void host_isattyfn(CPUState *cs, GuestFD *gf)
common_semi_cb(cs, isatty(gf->hostfd), 0);
}
-static void host_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
-{
- off_t ret = lseek(gf->hostfd, offset, SEEK_SET);
- common_semi_cb(cs, ret, ret == -1 ? errno : 0);
-}
-
static void host_flenfn(CPUState *cs, GuestFD *gf)
{
struct stat buf;
@@ -319,11 +314,6 @@ static void gdb_isattyfn(CPUState *cs, GuestFD *gf)
gdb_do_syscall(common_semi_cb, "isatty,%x", gf->hostfd);
}
-static void gdb_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
-{
- gdb_do_syscall(common_semi_cb, "lseek,%x,%x,0", gf->hostfd, offset);
-}
-
static void gdb_flenfn(CPUState *cs, GuestFD *gf)
{
gdb_do_syscall(common_semi_flen_cb, "fstat,%x,%x",
@@ -352,12 +342,6 @@ static void staticfile_isattyfn(CPUState *cs, GuestFD *gf)
common_semi_cb(cs, 0, 0);
}
-static void staticfile_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
-{
- gf->staticfile.off = offset;
- common_semi_cb(cs, 0, 0);
-}
-
static void staticfile_flenfn(CPUState *cs, GuestFD *gf)
{
common_semi_cb(cs, gf->staticfile.len, 0);
@@ -365,24 +349,20 @@ static void staticfile_flenfn(CPUState *cs, GuestFD *gf)
typedef struct GuestFDFunctions {
sys_isattyfn *isattyfn;
- sys_seekfn *seekfn;
sys_flenfn *flenfn;
} GuestFDFunctions;
static const GuestFDFunctions guestfd_fns[] = {
[GuestFDHost] = {
.isattyfn = host_isattyfn,
- .seekfn = host_seekfn,
.flenfn = host_flenfn,
},
[GuestFDGDB] = {
.isattyfn = gdb_isattyfn,
- .seekfn = gdb_seekfn,
.flenfn = gdb_flenfn,
},
[GuestFDStatic] = {
.isattyfn = staticfile_isattyfn,
- .seekfn = staticfile_seekfn,
.flenfn = staticfile_flenfn,
},
};
@@ -518,12 +498,7 @@ void do_common_semihosting(CPUState *cs)
case TARGET_SYS_SEEK:
GET_ARG(0);
GET_ARG(1);
-
- gf = get_guestfd(arg0);
- if (!gf) {
- goto do_badf;
- }
- guestfd_fns[gf->type].seekfn(cs, gf, arg1);
+ semihost_sys_lseek(cs, common_semi_seek_cb, arg0, arg1, GDB_SEEK_SET);
break;
case TARGET_SYS_FLEN:
diff --git a/semihosting/guestfd.c b/semihosting/guestfd.c
index 356b87453c..e33d226534 100644
--- a/semihosting/guestfd.c
+++ b/semihosting/guestfd.c
@@ -442,3 +442,84 @@ void semihost_sys_write(CPUState *cs, gdb_syscall_complete_cb complete,
g_assert_not_reached();
}
}
+
+static void gdb_lseek(CPUState *cs, gdb_syscall_complete_cb complete,
+ GuestFD *gf, int64_t off, int gdb_whence)
+{
+ gdb_do_syscall(complete, "lseek,%x,%lx,%x",
+ (target_ulong)gf->hostfd, off, (target_ulong)gdb_whence);
+}
+
+static void host_lseek(CPUState *cs, gdb_syscall_complete_cb complete,
+ GuestFD *gf, int64_t off, int whence)
+{
+ /* So far, all hosts use the same values. */
+ QEMU_BUILD_BUG_ON(GDB_SEEK_SET != SEEK_SET);
+ QEMU_BUILD_BUG_ON(GDB_SEEK_CUR != SEEK_CUR);
+ QEMU_BUILD_BUG_ON(GDB_SEEK_END != SEEK_END);
+
+ off_t ret = off;
+ int err = 0;
+
+ if (ret == off) {
+ ret = lseek(gf->hostfd, ret, whence);
+ if (ret == -1) {
+ err = errno;
+ }
+ } else {
+ ret = -1;
+ err = EOVERFLOW;
+ }
+ complete(cs, ret, err);
+}
+
+static void staticfile_lseek(CPUState *cs, gdb_syscall_complete_cb complete,
+ GuestFD *gf, int64_t off, int gdb_whence)
+{
+ int64_t ret;
+
+ switch (gdb_whence) {
+ case GDB_SEEK_SET:
+ ret = off;
+ break;
+ case GDB_SEEK_CUR:
+ ret = gf->staticfile.off + off;
+ break;
+ case GDB_SEEK_END:
+ ret = gf->staticfile.len - off;
+ break;
+ default:
+ ret = -1;
+ break;
+ }
+ if (ret >= 0 && ret <= gf->staticfile.len) {
+ gf->staticfile.off = ret;
+ complete(cs, ret, 0);
+ } else {
+ complete(cs, -1, EINVAL);
+ }
+}
+
+void semihost_sys_lseek(CPUState *cs, gdb_syscall_complete_cb complete,
+ int fd, int64_t off, int gdb_whence)
+{
+ GuestFD *gf = get_guestfd(fd);
+
+ if (!gf) {
+ complete(cs, -1, EBADF);
+ return;
+ }
+ switch (gf->type) {
+ case GuestFDGDB:
+ gdb_lseek(cs, complete, gf, off, gdb_whence);
+ return;
+ case GuestFDHost:
+ host_lseek(cs, complete, gf, off, gdb_whence);
+ break;
+ case GuestFDStatic:
+ staticfile_lseek(cs, complete, gf, off, gdb_whence);
+ break;
+ default:
+ g_assert_not_reached();
+ }
+}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 26/43] semihosting: Split out semihost_sys_isatty
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (24 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 25/43] semihosting: Split out semihost_sys_lseek Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 27/43] semihosting: Split out semihost_sys_flen Richard Henderson
` (17 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
Split out the non-ARM specific portions of SYS_ISTTY to a
reusable function. This handles all GuestFD.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
include/semihosting/guestfd.h | 3 +++
semihosting/arm-compat-semi.c | 27 +-----------------------
semihosting/guestfd.c | 39 +++++++++++++++++++++++++++++++++++
3 files changed, 43 insertions(+), 26 deletions(-)
diff --git a/include/semihosting/guestfd.h b/include/semihosting/guestfd.h
index 9c6967ac53..d3dd081e81 100644
--- a/include/semihosting/guestfd.h
+++ b/include/semihosting/guestfd.h
@@ -65,4 +65,7 @@ void semihost_sys_write(CPUState *cs, gdb_syscall_complete_cb complete,
void semihost_sys_lseek(CPUState *cs, gdb_syscall_complete_cb complete,
int fd, int64_t off, int gdb_whence);
+void semihost_sys_isatty(CPUState *cs, gdb_syscall_complete_cb complete,
+ int fd);
+
#endif /* SEMIHOSTING_GUESTFD_H */
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index 0cab721a50..3844d0e376 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -290,14 +290,8 @@ common_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
* do the work and return the required return value to the guest
* via common_semi_cb.
*/
-typedef void sys_isattyfn(CPUState *cs, GuestFD *gf);
typedef void sys_flenfn(CPUState *cs, GuestFD *gf);
-static void host_isattyfn(CPUState *cs, GuestFD *gf)
-{
- common_semi_cb(cs, isatty(gf->hostfd), 0);
-}
-
static void host_flenfn(CPUState *cs, GuestFD *gf)
{
struct stat buf;
@@ -309,11 +303,6 @@ static void host_flenfn(CPUState *cs, GuestFD *gf)
}
}
-static void gdb_isattyfn(CPUState *cs, GuestFD *gf)
-{
- gdb_do_syscall(common_semi_cb, "isatty,%x", gf->hostfd);
-}
-
static void gdb_flenfn(CPUState *cs, GuestFD *gf)
{
gdb_do_syscall(common_semi_flen_cb, "fstat,%x,%x",
@@ -337,32 +326,23 @@ static const uint8_t featurefile_data[] = {
SH_EXT_EXIT_EXTENDED | SH_EXT_STDOUT_STDERR, /* Feature byte 0 */
};
-static void staticfile_isattyfn(CPUState *cs, GuestFD *gf)
-{
- common_semi_cb(cs, 0, 0);
-}
-
static void staticfile_flenfn(CPUState *cs, GuestFD *gf)
{
common_semi_cb(cs, gf->staticfile.len, 0);
}
typedef struct GuestFDFunctions {
- sys_isattyfn *isattyfn;
sys_flenfn *flenfn;
} GuestFDFunctions;
static const GuestFDFunctions guestfd_fns[] = {
[GuestFDHost] = {
- .isattyfn = host_isattyfn,
.flenfn = host_flenfn,
},
[GuestFDGDB] = {
- .isattyfn = gdb_isattyfn,
.flenfn = gdb_flenfn,
},
[GuestFDStatic] = {
- .isattyfn = staticfile_isattyfn,
.flenfn = staticfile_flenfn,
},
};
@@ -487,12 +467,7 @@ void do_common_semihosting(CPUState *cs)
case TARGET_SYS_ISTTY:
GET_ARG(0);
-
- gf = get_guestfd(arg0);
- if (!gf) {
- goto do_badf;
- }
- guestfd_fns[gf->type].isattyfn(cs, gf);
+ semihost_sys_isatty(cs, common_semi_cb, arg0);
break;
case TARGET_SYS_SEEK:
diff --git a/semihosting/guestfd.c b/semihosting/guestfd.c
index e33d226534..6ed4a9162d 100644
--- a/semihosting/guestfd.c
+++ b/semihosting/guestfd.c
@@ -523,3 +523,42 @@ void semihost_sys_lseek(CPUState *cs, gdb_syscall_complete_cb complete,
g_assert_not_reached();
}
}
+
+static void gdb_isatty(CPUState *cs, gdb_syscall_complete_cb complete,
+ GuestFD *gf)
+{
+ gdb_do_syscall(complete, "isatty,%x", (target_ulong)gf->hostfd);
+}
+
+static void host_isatty(CPUState *cs, gdb_syscall_complete_cb complete,
+ GuestFD *gf)
+{
+ if (isatty(gf->hostfd)) {
+ complete(cs, 1, 0);
+ } else {
+ complete(cs, 0, errno);
+ }
+}
+
+void semihost_sys_isatty(CPUState *cs, gdb_syscall_complete_cb complete, int fd)
+{
+ GuestFD *gf = get_guestfd(fd);
+
+ if (!gf) {
+ complete(cs, 0, EBADF);
+ return;
+ }
+ switch (gf->type) {
+ case GuestFDGDB:
+ gdb_isatty(cs, complete, gf);
+ break;
+ case GuestFDHost:
+ host_isatty(cs, complete, gf);
+ break;
+ case GuestFDStatic:
+ complete(cs, 0, ENOTTY);
+ break;
+ default:
+ g_assert_not_reached();
+ }
+}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 27/43] semihosting: Split out semihost_sys_flen
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (25 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 26/43] semihosting: Split out semihost_sys_isatty Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 28/43] semihosting: Split out semihost_sys_remove Richard Henderson
` (16 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
The ARM-specific SYS_FLEN isn't really something that can be
reused by other semihosting apis, but moving the implementation
to guestfd.c means that we can keep the GuestFD stuff together.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
include/semihosting/guestfd.h | 4 ++
semihosting/arm-compat-semi.c | 83 ++++++++---------------------------
semihosting/guestfd.c | 55 +++++++++++++++++++++++
3 files changed, 78 insertions(+), 64 deletions(-)
diff --git a/include/semihosting/guestfd.h b/include/semihosting/guestfd.h
index d3dd081e81..d362b7ccf0 100644
--- a/include/semihosting/guestfd.h
+++ b/include/semihosting/guestfd.h
@@ -68,4 +68,8 @@ void semihost_sys_lseek(CPUState *cs, gdb_syscall_complete_cb complete,
void semihost_sys_isatty(CPUState *cs, gdb_syscall_complete_cb complete,
int fd);
+void semihost_sys_flen(CPUState *cs, gdb_syscall_complete_cb fstat_cb,
+ gdb_syscall_complete_cb flen_cb,
+ int fd, target_ulong fstat_addr);
+
#endif /* SEMIHOSTING_GUESTFD_H */
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index 3844d0e376..f9938ac879 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -272,41 +272,25 @@ static target_ulong common_semi_flen_buf(CPUState *cs)
}
static void
-common_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
+common_semi_flen_fstat_cb(CPUState *cs, target_ulong ret, target_ulong err)
{
- /* The size is always stored in big-endian order, extract the value. */
- uint64_t size;
- cpu_memory_rw_debug(cs, common_semi_flen_buf(cs) +
- offsetof(struct gdb_stat, gdb_st_size),
- &size, 8, 0);
- size = be64_to_cpu(size);
- common_semi_cb(cs, -1, err);
- common_semi_set_ret(cs, size);
-}
-
-/*
- * Types for functions implementing various semihosting calls
- * for specific types of guest file descriptor. These must all
- * do the work and return the required return value to the guest
- * via common_semi_cb.
- */
-typedef void sys_flenfn(CPUState *cs, GuestFD *gf);
-
-static void host_flenfn(CPUState *cs, GuestFD *gf)
-{
- struct stat buf;
-
- if (fstat(gf->hostfd, &buf)) {
- common_semi_cb(cs, -1, errno);
- } else {
- common_semi_cb(cs, buf.st_size, 0);
+ if (!err) {
+ /* The size is always stored in big-endian order, extract the value. */
+ CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
+ uint64_t size;
+ if (get_user_u64(size, common_semi_flen_buf(cs) +
+ offsetof(struct gdb_stat, gdb_st_size))) {
+ ret = -1, err = EFAULT;
+ } else {
+ /* Undo the tswap from get_user_u64, then swap from BE. */
+ size = be64_to_cpu(tswap64(size));
+ ret = size;
+ if (ret != size) {
+ ret = -1, err = EOVERFLOW;
+ }
+ }
}
-}
-
-static void gdb_flenfn(CPUState *cs, GuestFD *gf)
-{
- gdb_do_syscall(common_semi_flen_cb, "fstat,%x,%x",
- gf->hostfd, common_semi_flen_buf(cs));
+ common_semi_cb(cs, ret, err);
}
#define SHFB_MAGIC_0 0x53
@@ -326,27 +310,6 @@ static const uint8_t featurefile_data[] = {
SH_EXT_EXIT_EXTENDED | SH_EXT_STDOUT_STDERR, /* Feature byte 0 */
};
-static void staticfile_flenfn(CPUState *cs, GuestFD *gf)
-{
- common_semi_cb(cs, gf->staticfile.len, 0);
-}
-
-typedef struct GuestFDFunctions {
- sys_flenfn *flenfn;
-} GuestFDFunctions;
-
-static const GuestFDFunctions guestfd_fns[] = {
- [GuestFDHost] = {
- .flenfn = host_flenfn,
- },
- [GuestFDGDB] = {
- .flenfn = gdb_flenfn,
- },
- [GuestFDStatic] = {
- .flenfn = staticfile_flenfn,
- },
-};
-
/*
* Do a semihosting call.
*
@@ -365,7 +328,6 @@ void do_common_semihosting(CPUState *cs)
char * s;
int nr;
uint32_t ret;
- GuestFD *gf;
int64_t elapsed;
nr = common_semi_arg(cs, 0) & 0xffffffffU;
@@ -478,12 +440,8 @@ void do_common_semihosting(CPUState *cs)
case TARGET_SYS_FLEN:
GET_ARG(0);
-
- gf = get_guestfd(arg0);
- if (!gf) {
- goto do_badf;
- }
- guestfd_fns[gf->type].flenfn(cs, gf);
+ semihost_sys_flen(cs, common_semi_flen_fstat_cb, common_semi_cb,
+ arg0, common_semi_flen_buf(cs));
break;
case TARGET_SYS_TMPNAM:
@@ -805,9 +763,6 @@ void do_common_semihosting(CPUState *cs)
cpu_dump_state(cs, stderr, 0);
abort();
- do_badf:
- common_semi_cb(cs, -1, EBADF);
- break;
do_fault:
common_semi_cb(cs, -1, EFAULT);
break;
diff --git a/semihosting/guestfd.c b/semihosting/guestfd.c
index 6ed4a9162d..3a2100585d 100644
--- a/semihosting/guestfd.c
+++ b/semihosting/guestfd.c
@@ -562,3 +562,58 @@ void semihost_sys_isatty(CPUState *cs, gdb_syscall_complete_cb complete, int fd)
g_assert_not_reached();
}
}
+
+static void gdb_fstat(CPUState *cs, gdb_syscall_complete_cb complete,
+ GuestFD *gf, target_ulong addr)
+{
+ gdb_do_syscall(complete, "fstat,%x,%x", (target_ulong)gf->hostfd, addr);
+}
+
+static void host_flen(CPUState *cs, gdb_syscall_complete_cb complete,
+ GuestFD *gf)
+{
+ struct stat buf;
+ target_ulong ret;
+
+ if (fstat(gf->hostfd, &buf) < 0) {
+ complete(cs, -1, errno);
+ } else {
+ ret = buf.st_size;
+ if (ret != buf.st_size) {
+ complete(cs, -1, EOVERFLOW);
+ } else {
+ complete(cs, ret, 0);
+ }
+ }
+}
+
+static void staticfile_flen(CPUState *cs, gdb_syscall_complete_cb complete,
+ GuestFD *gf)
+{
+ complete(cs, gf->staticfile.len, 0);
+}
+
+void semihost_sys_flen(CPUState *cs, gdb_syscall_complete_cb fstat_cb,
+ gdb_syscall_complete_cb flen_cb, int fd,
+ target_ulong fstat_addr)
+{
+ GuestFD *gf = get_guestfd(fd);
+
+ if (!gf) {
+ flen_cb(cs, -1, EBADF);
+ return;
+ }
+ switch (gf->type) {
+ case GuestFDGDB:
+ gdb_fstat(cs, fstat_cb, gf, fstat_addr);
+ break;
+ case GuestFDHost:
+ host_flen(cs, flen_cb, gf);
+ break;
+ case GuestFDStatic:
+ staticfile_flen(cs, flen_cb, gf);
+ break;
+ default:
+ g_assert_not_reached();
+ }
+}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 28/43] semihosting: Split out semihost_sys_remove
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (26 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 27/43] semihosting: Split out semihost_sys_flen Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 29/43] semihosting: Split out semihost_sys_rename Richard Henderson
` (15 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
Split out the non-ARM specific portions of SYS_REMOVE to a
reusable function. This doesn't use GuestFD, but it does
reuse validate_strlen() from semihost_sys_open.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
include/semihosting/guestfd.h | 3 +++
semihosting/arm-compat-semi.c | 13 +-----------
semihosting/guestfd.c | 40 +++++++++++++++++++++++++++++++++++
3 files changed, 44 insertions(+), 12 deletions(-)
diff --git a/include/semihosting/guestfd.h b/include/semihosting/guestfd.h
index d362b7ccf0..c31a48598a 100644
--- a/include/semihosting/guestfd.h
+++ b/include/semihosting/guestfd.h
@@ -72,4 +72,7 @@ void semihost_sys_flen(CPUState *cs, gdb_syscall_complete_cb fstat_cb,
gdb_syscall_complete_cb flen_cb,
int fd, target_ulong fstat_addr);
+void semihost_sys_remove(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong fname, target_ulong fname_len);
+
#endif /* SEMIHOSTING_GUESTFD_H */
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index f9938ac879..d460754ea0 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -472,18 +472,7 @@ void do_common_semihosting(CPUState *cs)
case TARGET_SYS_REMOVE:
GET_ARG(0);
GET_ARG(1);
- if (use_gdb_syscalls()) {
- gdb_do_syscall(common_semi_cb, "unlink,%s",
- arg0, (int)arg1 + 1);
- break;
- }
- s = lock_user_string(arg0);
- if (!s) {
- goto do_fault;
- }
- ret = remove(s);
- unlock_user(s, arg0, 0);
- common_semi_cb(cs, ret, ret ? errno : 0);
+ semihost_sys_remove(cs, common_semi_cb, arg0, arg1 + 1);
break;
case TARGET_SYS_RENAME:
diff --git a/semihosting/guestfd.c b/semihosting/guestfd.c
index 3a2100585d..17d43e83d3 100644
--- a/semihosting/guestfd.c
+++ b/semihosting/guestfd.c
@@ -617,3 +617,43 @@ void semihost_sys_flen(CPUState *cs, gdb_syscall_complete_cb fstat_cb,
g_assert_not_reached();
}
}
+
+static void gdb_remove(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong fname, target_ulong fname_len)
+{
+ int len = validate_strlen(cs, fname, fname_len);
+ if (len < 0) {
+ complete(cs, -1, -len);
+ return;
+ }
+
+ gdb_do_syscall(complete, "unlink,%s", fname, len);
+}
+
+static void host_remove(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong fname, target_ulong fname_len)
+{
+ CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
+ char *p;
+ int ret;
+
+ ret = validate_lock_user_string(&p, cs, fname, fname_len);
+ if (ret < 0) {
+ complete(cs, -1, -ret);
+ return;
+ }
+
+ ret = remove(p);
+ complete(cs, ret, ret ? errno : 0);
+ unlock_user(p, fname, 0);
+}
+
+void semihost_sys_remove(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong fname, target_ulong fname_len)
+{
+ if (use_gdb_syscalls()) {
+ gdb_remove(cs, complete, fname, fname_len);
+ } else {
+ host_remove(cs, complete, fname, fname_len);
+ }
+}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 29/43] semihosting: Split out semihost_sys_rename
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (27 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 28/43] semihosting: Split out semihost_sys_remove Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 30/43] semihosting: Split out semihost_sys_system Richard Henderson
` (14 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
Split out the non-ARM specific portions of SYS_RENAME to a
reusable function. This doesn't use GuestFD, but it does
reuse validate_strlen() from semihost_sys_open.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
include/semihosting/guestfd.h | 4 +++
semihosting/arm-compat-semi.c | 21 +------------
semihosting/guestfd.c | 57 +++++++++++++++++++++++++++++++++++
3 files changed, 62 insertions(+), 20 deletions(-)
diff --git a/include/semihosting/guestfd.h b/include/semihosting/guestfd.h
index c31a48598a..2bdf02429b 100644
--- a/include/semihosting/guestfd.h
+++ b/include/semihosting/guestfd.h
@@ -75,4 +75,8 @@ void semihost_sys_flen(CPUState *cs, gdb_syscall_complete_cb fstat_cb,
void semihost_sys_remove(CPUState *cs, gdb_syscall_complete_cb complete,
target_ulong fname, target_ulong fname_len);
+void semihost_sys_rename(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong oname, target_ulong oname_len,
+ target_ulong nname, target_ulong nname_len);
+
#endif /* SEMIHOSTING_GUESTFD_H */
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index d460754ea0..143c8689f5 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -480,26 +480,7 @@ void do_common_semihosting(CPUState *cs)
GET_ARG(1);
GET_ARG(2);
GET_ARG(3);
- if (use_gdb_syscalls()) {
- gdb_do_syscall(common_semi_cb, "rename,%s,%s",
- arg0, (int)arg1 + 1, arg2, (int)arg3 + 1);
- } else {
- char *s2;
-
- s = lock_user_string(arg0);
- if (!s) {
- goto do_fault;
- }
- s2 = lock_user_string(arg2);
- if (!s2) {
- unlock_user(s, arg0, 0);
- goto do_fault;
- }
- ret = rename(s, s2);
- unlock_user(s2, arg2, 0);
- unlock_user(s, arg0, 0);
- common_semi_cb(cs, ret, ret ? errno : 0);
- }
+ semihost_sys_rename(cs, common_semi_cb, arg0, arg1 + 1, arg2, arg3 + 1);
break;
case TARGET_SYS_CLOCK:
diff --git a/semihosting/guestfd.c b/semihosting/guestfd.c
index 17d43e83d3..03e516535a 100644
--- a/semihosting/guestfd.c
+++ b/semihosting/guestfd.c
@@ -657,3 +657,60 @@ void semihost_sys_remove(CPUState *cs, gdb_syscall_complete_cb complete,
host_remove(cs, complete, fname, fname_len);
}
}
+
+static void gdb_rename(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong oname, target_ulong oname_len,
+ target_ulong nname, target_ulong nname_len)
+{
+ int olen, nlen;
+
+ olen = validate_strlen(cs, oname, oname_len);
+ if (olen < 0) {
+ complete(cs, -1, -olen);
+ return;
+ }
+ nlen = validate_strlen(cs, nname, nname_len);
+ if (nlen < 0) {
+ complete(cs, -1, -nlen);
+ return;
+ }
+
+ gdb_do_syscall(complete, "rename,%s,%s", oname, olen, nname, nlen);
+}
+
+static void host_rename(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong oname, target_ulong oname_len,
+ target_ulong nname, target_ulong nname_len)
+{
+ CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
+ char *ostr, *nstr;
+ int ret;
+
+ ret = validate_lock_user_string(&ostr, cs, oname, oname_len);
+ if (ret < 0) {
+ complete(cs, -1, -ret);
+ return;
+ }
+ ret = validate_lock_user_string(&nstr, cs, nname, nname_len);
+ if (ret < 0) {
+ unlock_user(ostr, oname, 0);
+ complete(cs, -1, -ret);
+ return;
+ }
+
+ ret = rename(ostr, nstr);
+ complete(cs, ret, ret ? errno : 0);
+ unlock_user(ostr, oname, 0);
+ unlock_user(nstr, nname, 0);
+}
+
+void semihost_sys_rename(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong oname, target_ulong oname_len,
+ target_ulong nname, target_ulong nname_len)
+{
+ if (use_gdb_syscalls()) {
+ gdb_rename(cs, complete, oname, oname_len, nname, nname_len);
+ } else {
+ host_rename(cs, complete, oname, oname_len, nname, nname_len);
+ }
+}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 30/43] semihosting: Split out semihost_sys_system
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (28 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 29/43] semihosting: Split out semihost_sys_rename Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 31/43] semihosting: Create semihost_sys_{stat,fstat} Richard Henderson
` (13 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
Split out the non-ARM specific portions of SYS_SYSTEM to a
reusable function. This doesn't use GuestFD, but it does
reuse validate_strlen() from semihost_sys_open.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
include/semihosting/guestfd.h | 3 +++
semihosting/arm-compat-semi.c | 12 +----------
semihosting/guestfd.c | 40 +++++++++++++++++++++++++++++++++++
3 files changed, 44 insertions(+), 11 deletions(-)
diff --git a/include/semihosting/guestfd.h b/include/semihosting/guestfd.h
index 2bdf02429b..a6d34e8141 100644
--- a/include/semihosting/guestfd.h
+++ b/include/semihosting/guestfd.h
@@ -79,4 +79,7 @@ void semihost_sys_rename(CPUState *cs, gdb_syscall_complete_cb complete,
target_ulong oname, target_ulong oname_len,
target_ulong nname, target_ulong nname_len);
+void semihost_sys_system(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong cmd, target_ulong cmd_len);
+
#endif /* SEMIHOSTING_GUESTFD_H */
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index 143c8689f5..61e8dede8d 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -495,17 +495,7 @@ void do_common_semihosting(CPUState *cs)
case TARGET_SYS_SYSTEM:
GET_ARG(0);
GET_ARG(1);
- if (use_gdb_syscalls()) {
- gdb_do_syscall(common_semi_cb, "system,%s", arg0, (int)arg1 + 1);
- break;
- }
- s = lock_user_string(arg0);
- if (!s) {
- goto do_fault;
- }
- ret = system(s);
- unlock_user(s, arg0, 0);
- common_semi_cb(cs, ret, ret == -1 ? errno : 0);
+ semihost_sys_system(cs, common_semi_cb, arg0, arg1 + 1);
break;
case TARGET_SYS_ERRNO:
diff --git a/semihosting/guestfd.c b/semihosting/guestfd.c
index 03e516535a..9176ddd301 100644
--- a/semihosting/guestfd.c
+++ b/semihosting/guestfd.c
@@ -714,3 +714,43 @@ void semihost_sys_rename(CPUState *cs, gdb_syscall_complete_cb complete,
host_rename(cs, complete, oname, oname_len, nname, nname_len);
}
}
+
+static void gdb_system(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong cmd, target_ulong cmd_len)
+{
+ int len = validate_strlen(cs, cmd, cmd_len);
+ if (len < 0) {
+ complete(cs, -1, -len);
+ return;
+ }
+
+ gdb_do_syscall(complete, "system,%s", cmd, len);
+}
+
+static void host_system(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong cmd, target_ulong cmd_len)
+{
+ CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
+ char *p;
+ int ret;
+
+ ret = validate_lock_user_string(&p, cs, cmd, cmd_len);
+ if (ret < 0) {
+ complete(cs, -1, -ret);
+ return;
+ }
+
+ ret = system(p);
+ complete(cs, ret, ret == -1 ? errno : 0);
+ unlock_user(p, cmd, 0);
+}
+
+void semihost_sys_system(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong cmd, target_ulong cmd_len)
+{
+ if (use_gdb_syscalls()) {
+ gdb_system(cs, complete, cmd, cmd_len);
+ } else {
+ host_system(cs, complete, cmd, cmd_len);
+ }
+}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 31/43] semihosting: Create semihost_sys_{stat,fstat}
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (29 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 30/43] semihosting: Split out semihost_sys_system Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 32/43] semihosting: Create semihost_sys_gettimeofday Richard Henderson
` (12 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
These syscalls will be used by m68k and nios2 semihosting.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
include/semihosting/guestfd.h | 7 ++
semihosting/guestfd.c | 137 ++++++++++++++++++++++++++++++++++
2 files changed, 144 insertions(+)
diff --git a/include/semihosting/guestfd.h b/include/semihosting/guestfd.h
index a6d34e8141..315cac1c44 100644
--- a/include/semihosting/guestfd.h
+++ b/include/semihosting/guestfd.h
@@ -82,4 +82,11 @@ void semihost_sys_rename(CPUState *cs, gdb_syscall_complete_cb complete,
void semihost_sys_system(CPUState *cs, gdb_syscall_complete_cb complete,
target_ulong cmd, target_ulong cmd_len);
+void semihost_sys_fstat(CPUState *cs, gdb_syscall_complete_cb complete,
+ int fd, target_ulong addr);
+
+void semihost_sys_stat(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong fname, target_ulong fname_len,
+ target_ulong addr);
+
#endif /* SEMIHOSTING_GUESTFD_H */
diff --git a/semihosting/guestfd.c b/semihosting/guestfd.c
index 9176ddd301..c182d5b7e6 100644
--- a/semihosting/guestfd.c
+++ b/semihosting/guestfd.c
@@ -563,12 +563,95 @@ void semihost_sys_isatty(CPUState *cs, gdb_syscall_complete_cb complete, int fd)
}
}
+/*
+ * TODO: Note that gdb always stores the stat structure big-endian.
+ * So far, that's ok, as the only two targets using this are also
+ * big-endian. Until we do something with gdb, also produce the
+ * same big-endian result from the host.
+ */
+static int copy_stat_to_user(CPUState *cs, target_ulong addr,
+ const struct stat *s)
+{
+ CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
+ struct gdb_stat *p;
+
+ if (s->st_dev != (uint32_t)s->st_dev ||
+ s->st_ino != (uint32_t)s->st_ino) {
+ return -EOVERFLOW;
+ }
+
+ p = lock_user(VERIFY_WRITE, addr, sizeof(struct gdb_stat), 0);
+ if (!p) {
+ return -EFAULT;
+ }
+
+ p->gdb_st_dev = cpu_to_be32(s->st_dev);
+ p->gdb_st_ino = cpu_to_be32(s->st_ino);
+ p->gdb_st_mode = cpu_to_be32(s->st_mode);
+ p->gdb_st_nlink = cpu_to_be32(s->st_nlink);
+ p->gdb_st_uid = cpu_to_be32(s->st_uid);
+ p->gdb_st_gid = cpu_to_be32(s->st_gid);
+ p->gdb_st_rdev = cpu_to_be32(s->st_rdev);
+ p->gdb_st_size = cpu_to_be64(s->st_size);
+#ifdef _WIN32
+ /* Windows stat is missing some fields. */
+ p->gdb_st_blksize = 0;
+ p->gdb_st_blocks = 0;
+#else
+ p->gdb_st_blksize = cpu_to_be64(s->st_blksize);
+ p->gdb_st_blocks = cpu_to_be64(s->st_blocks);
+#endif
+ p->gdb_st_atime = cpu_to_be32(s->st_atime);
+ p->gdb_st_mtime = cpu_to_be32(s->st_mtime);
+ p->gdb_st_ctime = cpu_to_be32(s->st_ctime);
+
+ unlock_user(p, addr, sizeof(struct gdb_stat));
+ return 0;
+}
+
static void gdb_fstat(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf, target_ulong addr)
{
gdb_do_syscall(complete, "fstat,%x,%x", (target_ulong)gf->hostfd, addr);
}
+static void host_fstat(CPUState *cs, gdb_syscall_complete_cb complete,
+ GuestFD *gf, target_ulong addr)
+{
+ struct stat buf;
+ int ret;
+
+ ret = fstat(gf->hostfd, &buf);
+ if (ret) {
+ complete(cs, -1, errno);
+ return;
+ }
+ ret = copy_stat_to_user(cs, addr, &buf);
+ complete(cs, ret ? -1 : 0, ret ? -ret : 0);
+}
+
+void semihost_sys_fstat(CPUState *cs, gdb_syscall_complete_cb complete,
+ int fd, target_ulong addr)
+{
+ GuestFD *gf = get_guestfd(fd);
+
+ if (!gf) {
+ complete(cs, -1, EBADF);
+ return;
+ }
+ switch (gf->type) {
+ case GuestFDGDB:
+ gdb_fstat(cs, complete, gf, addr);
+ break;
+ case GuestFDHost:
+ host_fstat(cs, complete, gf, addr);
+ break;
+ case GuestFDStatic:
+ default:
+ g_assert_not_reached();
+ }
+}
+
static void host_flen(CPUState *cs, gdb_syscall_complete_cb complete,
GuestFD *gf)
{
@@ -754,3 +837,57 @@ void semihost_sys_system(CPUState *cs, gdb_syscall_complete_cb complete,
host_system(cs, complete, cmd, cmd_len);
}
}
+
+static void gdb_stat(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong fname, target_ulong fname_len,
+ target_ulong addr)
+{
+ int len = validate_strlen(cs, fname, fname_len);
+ if (len < 0) {
+ complete(cs, -1, -len);
+ return;
+ }
+
+ gdb_do_syscall(complete, "stat,%s,%x", fname, len, addr);
+}
+
+static void host_stat(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong fname, target_ulong fname_len,
+ target_ulong addr)
+{
+ CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
+ struct stat buf;
+ char *name;
+ int ret, err;
+
+ ret = validate_lock_user_string(&name, cs, fname, fname_len);
+ if (ret < 0) {
+ complete(cs, -1, -ret);
+ return;
+ }
+
+ ret = stat(name, &buf);
+ if (ret) {
+ err = errno;
+ } else {
+ ret = copy_stat_to_user(cs, addr, &buf);
+ err = 0;
+ if (ret < 0) {
+ err = -ret;
+ ret = -1;
+ }
+ }
+ complete(cs, ret, err);
+ unlock_user(name, fname, 0);
+}
+
+void semihost_sys_stat(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong fname, target_ulong fname_len,
+ target_ulong addr)
+{
+ if (use_gdb_syscalls()) {
+ gdb_stat(cs, complete, fname, fname_len, addr);
+ } else {
+ host_stat(cs, complete, fname, fname_len, addr);
+ }
+}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 32/43] semihosting: Create semihost_sys_gettimeofday
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (30 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 31/43] semihosting: Create semihost_sys_{stat,fstat} Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 33/43] gdbstub: Widen gdb_syscall_complete_cb return value Richard Henderson
` (11 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
This syscall will be used by m68k and nios2 semihosting.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
include/semihosting/guestfd.h | 3 +++
semihosting/guestfd.c | 42 +++++++++++++++++++++++++++++++++++
2 files changed, 45 insertions(+)
diff --git a/include/semihosting/guestfd.h b/include/semihosting/guestfd.h
index 315cac1c44..5b0ed1b472 100644
--- a/include/semihosting/guestfd.h
+++ b/include/semihosting/guestfd.h
@@ -89,4 +89,7 @@ void semihost_sys_stat(CPUState *cs, gdb_syscall_complete_cb complete,
target_ulong fname, target_ulong fname_len,
target_ulong addr);
+void semihost_sys_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong tv_addr, target_ulong tz_addr);
+
#endif /* SEMIHOSTING_GUESTFD_H */
diff --git a/semihosting/guestfd.c b/semihosting/guestfd.c
index c182d5b7e6..cb9eab9587 100644
--- a/semihosting/guestfd.c
+++ b/semihosting/guestfd.c
@@ -891,3 +891,45 @@ void semihost_sys_stat(CPUState *cs, gdb_syscall_complete_cb complete,
host_stat(cs, complete, fname, fname_len, addr);
}
}
+
+static void gdb_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong tv_addr, target_ulong tz_addr)
+{
+ gdb_do_syscall(complete, "gettimeofday,%s,%x", tv_addr, tz_addr);
+}
+
+static void host_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong tv_addr, target_ulong tz_addr)
+{
+ CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
+ struct gdb_timeval *p;
+ int64_t rt;
+
+ /* GDB fails on non-null TZ, so be consistent. */
+ if (tz_addr != 0) {
+ complete(cs, -1, EINVAL);
+ return;
+ }
+
+ p = lock_user(VERIFY_WRITE, tv_addr, sizeof(struct gdb_timeval), 0);
+ if (!p) {
+ complete(cs, -1, EFAULT);
+ return;
+ }
+
+ /* TODO: Like stat, gdb always produces big-endian results; match it. */
+ rt = g_get_real_time();
+ p->tv_sec = cpu_to_be32(rt / G_USEC_PER_SEC);
+ p->tv_usec = cpu_to_be64(rt % G_USEC_PER_SEC);
+ unlock_user(p, tv_addr, sizeof(struct gdb_timeval));
+}
+
+void semihost_sys_gettimeofday(CPUState *cs, gdb_syscall_complete_cb complete,
+ target_ulong tv_addr, target_ulong tz_addr)
+{
+ if (use_gdb_syscalls()) {
+ gdb_gettimeofday(cs, complete, tv_addr, tz_addr);
+ } else {
+ host_gettimeofday(cs, complete, tv_addr, tz_addr);
+ }
+}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 33/43] gdbstub: Widen gdb_syscall_complete_cb return value
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (31 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 32/43] semihosting: Create semihost_sys_gettimeofday Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 34/43] target/m68k: Eliminate m68k_semi_is_fseek Richard Henderson
` (10 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
Always pass a uint64_t. This resolves a FIXME in the
m68k and nios2 semihosting that we've lost data.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
include/exec/gdbstub.h | 3 +--
gdbstub.c | 7 ++++---
semihosting/arm-compat-semi.c | 9 ++++-----
semihosting/console.c | 7 +++----
semihosting/guestfd.c | 2 +-
target/m68k/m68k-semi.c | 10 +++-------
target/nios2/nios2-semi.c | 8 +++-----
7 files changed, 19 insertions(+), 27 deletions(-)
diff --git a/include/exec/gdbstub.h b/include/exec/gdbstub.h
index a7d3bfd5d4..22b386ff65 100644
--- a/include/exec/gdbstub.h
+++ b/include/exec/gdbstub.h
@@ -53,8 +53,7 @@ struct gdb_timeval {
#ifdef NEED_CPU_H
#include "cpu.h"
-typedef void (*gdb_syscall_complete_cb)(CPUState *cpu,
- target_ulong ret, target_ulong err);
+typedef void (*gdb_syscall_complete_cb)(CPUState *cpu, uint64_t ret, int err);
/**
* gdb_do_syscall:
diff --git a/gdbstub.c b/gdbstub.c
index a3ff8702ce..5286253f8a 100644
--- a/gdbstub.c
+++ b/gdbstub.c
@@ -1870,11 +1870,12 @@ static void handle_read_all_regs(GArray *params, void *user_ctx)
static void handle_file_io(GArray *params, void *user_ctx)
{
if (params->len >= 1 && gdbserver_state.current_syscall_cb) {
- target_ulong ret, err;
+ uint64_t ret;
+ int err;
- ret = (target_ulong)get_param(params, 0)->val_ull;
+ ret = get_param(params, 0)->val_ull;
if (params->len >= 2) {
- err = (target_ulong)get_param(params, 1)->val_ull;
+ err = get_param(params, 1)->val_ull;
} else {
err = 0;
}
diff --git a/semihosting/arm-compat-semi.c b/semihosting/arm-compat-semi.c
index 61e8dede8d..ad0df6eabf 100644
--- a/semihosting/arm-compat-semi.c
+++ b/semihosting/arm-compat-semi.c
@@ -216,7 +216,7 @@ static inline uint32_t get_swi_errno(CPUState *cs)
#endif
}
-static void common_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
+static void common_semi_cb(CPUState *cs, uint64_t ret, int err)
{
if (err) {
#ifdef CONFIG_USER_ONLY
@@ -233,7 +233,7 @@ static void common_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
* SYS_READ and SYS_WRITE always return the number of bytes not read/written.
* There is no error condition, other than returning the original length.
*/
-static void common_semi_rw_cb(CPUState *cs, target_ulong ret, target_ulong err)
+static void common_semi_rw_cb(CPUState *cs, uint64_t ret, int err)
{
/* Recover the original length from the third argument. */
CPUArchState *env G_GNUC_UNUSED = cs->env_ptr;
@@ -250,8 +250,7 @@ static void common_semi_rw_cb(CPUState *cs, target_ulong ret, target_ulong err)
/*
* SYS_SEEK returns 0 on success, not the resulting offset.
*/
-static void common_semi_seek_cb(CPUState *cs, target_ulong ret,
- target_ulong err)
+static void common_semi_seek_cb(CPUState *cs, uint64_t ret, int err)
{
if (!err) {
ret = 0;
@@ -272,7 +271,7 @@ static target_ulong common_semi_flen_buf(CPUState *cs)
}
static void
-common_semi_flen_fstat_cb(CPUState *cs, target_ulong ret, target_ulong err)
+common_semi_flen_fstat_cb(CPUState *cs, uint64_t ret, int err)
{
if (!err) {
/* The size is always stored in big-endian order, extract the value. */
diff --git a/semihosting/console.c b/semihosting/console.c
index ef6958d844..3dd0ac60e2 100644
--- a/semihosting/console.c
+++ b/semihosting/console.c
@@ -64,11 +64,10 @@ static GString *copy_user_string(CPUArchState *env, target_ulong addr)
return s;
}
-static void semihosting_cb(CPUState *cs, target_ulong ret, target_ulong err)
+static void semihosting_cb(CPUState *cs, uint64_t ret, int err)
{
- if (ret == (target_ulong) -1) {
- qemu_log("%s: gdb console output failed ("TARGET_FMT_ld")",
- __func__, err);
+ if (err) {
+ qemu_log("%s: gdb console output failed (%d)", __func__, err);
}
}
diff --git a/semihosting/guestfd.c b/semihosting/guestfd.c
index cb9eab9587..341113f939 100644
--- a/semihosting/guestfd.c
+++ b/semihosting/guestfd.c
@@ -179,7 +179,7 @@ static int validate_lock_user_string(char **pstr, CPUState *cs,
static gdb_syscall_complete_cb gdb_open_complete;
-static void gdb_open_cb(CPUState *cs, target_ulong ret, target_ulong err)
+static void gdb_open_cb(CPUState *cs, uint64_t ret, int err)
{
if (!err) {
int guestfd = alloc_guestfd();
diff --git a/target/m68k/m68k-semi.c b/target/m68k/m68k-semi.c
index da0186f3ef..94deebf09e 100644
--- a/target/m68k/m68k-semi.c
+++ b/target/m68k/m68k-semi.c
@@ -93,7 +93,7 @@ static void translate_stat(CPUM68KState *env, target_ulong addr, struct stat *s)
unlock_user(p, addr, sizeof(struct gdb_stat));
}
-static void m68k_semi_return_u32(CPUM68KState *env, uint32_t ret, uint32_t err)
+static void m68k_semi_return_u32(CPUM68KState *env, uint32_t ret, int err)
{
target_ulong args = env->dregs[1];
if (put_user_u32(ret, args) ||
@@ -108,7 +108,7 @@ static void m68k_semi_return_u32(CPUM68KState *env, uint32_t ret, uint32_t err)
}
}
-static void m68k_semi_return_u64(CPUM68KState *env, uint64_t ret, uint32_t err)
+static void m68k_semi_return_u64(CPUM68KState *env, uint64_t ret, int err)
{
target_ulong args = env->dregs[1];
if (put_user_u32(ret >> 32, args) ||
@@ -122,16 +122,12 @@ static void m68k_semi_return_u64(CPUM68KState *env, uint64_t ret, uint32_t err)
static int m68k_semi_is_fseek;
-static void m68k_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
+static void m68k_semi_cb(CPUState *cs, uint64_t ret, int err)
{
M68kCPU *cpu = M68K_CPU(cs);
CPUM68KState *env = &cpu->env;
if (m68k_semi_is_fseek) {
- /*
- * FIXME: We've already lost the high bits of the fseek
- * return value.
- */
m68k_semi_return_u64(env, ret, err);
m68k_semi_is_fseek = 0;
} else {
diff --git a/target/nios2/nios2-semi.c b/target/nios2/nios2-semi.c
index 3e504a6c5f..4d02789d26 100644
--- a/target/nios2/nios2-semi.c
+++ b/target/nios2/nios2-semi.c
@@ -108,8 +108,7 @@ static bool translate_stat(CPUNios2State *env, target_ulong addr,
return true;
}
-static void nios2_semi_return_u32(CPUNios2State *env, uint32_t ret,
- uint32_t err)
+static void nios2_semi_return_u32(CPUNios2State *env, uint32_t ret, int err)
{
target_ulong args = env->regs[R_ARG1];
if (put_user_u32(ret, args) ||
@@ -124,8 +123,7 @@ static void nios2_semi_return_u32(CPUNios2State *env, uint32_t ret,
}
}
-static void nios2_semi_return_u64(CPUNios2State *env, uint64_t ret,
- uint32_t err)
+static void nios2_semi_return_u64(CPUNios2State *env, uint64_t ret, int err)
{
target_ulong args = env->regs[R_ARG1];
if (put_user_u32(ret >> 32, args) ||
@@ -139,7 +137,7 @@ static void nios2_semi_return_u64(CPUNios2State *env, uint64_t ret,
static int nios2_semi_is_lseek;
-static void nios2_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
+static void nios2_semi_cb(CPUState *cs, uint64_t ret, int err)
{
Nios2CPU *cpu = NIOS2_CPU(cs);
CPUNios2State *env = &cpu->env;
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 34/43] target/m68k: Eliminate m68k_semi_is_fseek
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (32 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 33/43] gdbstub: Widen gdb_syscall_complete_cb return value Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 35/43] target/m68k: Make semihosting system only Richard Henderson
` (9 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
Reorg m68k_semi_return_* to gdb_syscall_complete_cb.
Use the 32-bit version normally, and the 64-bit version
for HOSTED_LSEEK.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/m68k/m68k-semi.c | 55 +++++++++++++++++------------------------
1 file changed, 23 insertions(+), 32 deletions(-)
diff --git a/target/m68k/m68k-semi.c b/target/m68k/m68k-semi.c
index 94deebf09e..5b4c51957e 100644
--- a/target/m68k/m68k-semi.c
+++ b/target/m68k/m68k-semi.c
@@ -93,8 +93,11 @@ static void translate_stat(CPUM68KState *env, target_ulong addr, struct stat *s)
unlock_user(p, addr, sizeof(struct gdb_stat));
}
-static void m68k_semi_return_u32(CPUM68KState *env, uint32_t ret, int err)
+static void m68k_semi_u32_cb(CPUState *cs, uint64_t ret, int err)
{
+ M68kCPU *cpu = M68K_CPU(cs);
+ CPUM68KState *env = &cpu->env;
+
target_ulong args = env->dregs[1];
if (put_user_u32(ret, args) ||
put_user_u32(err, args + 4)) {
@@ -108,8 +111,11 @@ static void m68k_semi_return_u32(CPUM68KState *env, uint32_t ret, int err)
}
}
-static void m68k_semi_return_u64(CPUM68KState *env, uint64_t ret, int err)
+static void m68k_semi_u64_cb(CPUState *cs, uint64_t ret, int err)
{
+ M68kCPU *cpu = M68K_CPU(cs);
+ CPUM68KState *env = &cpu->env;
+
target_ulong args = env->dregs[1];
if (put_user_u32(ret >> 32, args) ||
put_user_u32(ret, args + 4) ||
@@ -120,21 +126,6 @@ static void m68k_semi_return_u64(CPUM68KState *env, uint64_t ret, int err)
}
}
-static int m68k_semi_is_fseek;
-
-static void m68k_semi_cb(CPUState *cs, uint64_t ret, int err)
-{
- M68kCPU *cpu = M68K_CPU(cs);
- CPUM68KState *env = &cpu->env;
-
- if (m68k_semi_is_fseek) {
- m68k_semi_return_u64(env, ret, err);
- m68k_semi_is_fseek = 0;
- } else {
- m68k_semi_return_u32(env, ret, err);
- }
-}
-
/*
* Read the input value from the argument block; fail the semihosting
* call if the memory read fails.
@@ -149,6 +140,7 @@ static void m68k_semi_cb(CPUState *cs, uint64_t ret, int err)
void do_m68k_semihosting(CPUM68KState *env, int nr)
{
+ CPUState *cs = env_cpu(env);
uint32_t args;
target_ulong arg0, arg1, arg2, arg3;
void *p;
@@ -167,7 +159,7 @@ void do_m68k_semihosting(CPUM68KState *env, int nr)
GET_ARG(2);
GET_ARG(3);
if (use_gdb_syscalls()) {
- gdb_do_syscall(m68k_semi_cb, "open,%s,%x,%x", arg0, (int)arg1,
+ gdb_do_syscall(m68k_semi_u32_cb, "open,%s,%x,%x", arg0, (int)arg1,
arg2, arg3);
return;
} else {
@@ -188,7 +180,7 @@ void do_m68k_semihosting(CPUM68KState *env, int nr)
int fd = arg0;
if (fd > 2) {
if (use_gdb_syscalls()) {
- gdb_do_syscall(m68k_semi_cb, "close,%x", arg0);
+ gdb_do_syscall(m68k_semi_u32_cb, "close,%x", arg0);
return;
} else {
result = close(fd);
@@ -204,7 +196,7 @@ void do_m68k_semihosting(CPUM68KState *env, int nr)
GET_ARG(2);
len = arg2;
if (use_gdb_syscalls()) {
- gdb_do_syscall(m68k_semi_cb, "read,%x,%x,%x",
+ gdb_do_syscall(m68k_semi_u32_cb, "read,%x,%x,%x",
arg0, arg1, len);
return;
} else {
@@ -224,7 +216,7 @@ void do_m68k_semihosting(CPUM68KState *env, int nr)
GET_ARG(2);
len = arg2;
if (use_gdb_syscalls()) {
- gdb_do_syscall(m68k_semi_cb, "write,%x,%x,%x",
+ gdb_do_syscall(m68k_semi_u32_cb, "write,%x,%x,%x",
arg0, arg1, len);
return;
} else {
@@ -247,12 +239,11 @@ void do_m68k_semihosting(CPUM68KState *env, int nr)
GET_ARG(3);
off = (uint32_t)arg2 | ((uint64_t)arg1 << 32);
if (use_gdb_syscalls()) {
- m68k_semi_is_fseek = 1;
- gdb_do_syscall(m68k_semi_cb, "fseek,%x,%lx,%x",
+ gdb_do_syscall(m68k_semi_u64_cb, "fseek,%x,%lx,%x",
arg0, off, arg3);
} else {
off = lseek(arg0, off, arg3);
- m68k_semi_return_u64(env, off, errno);
+ m68k_semi_u64_cb(cs, off, errno);
}
return;
}
@@ -262,7 +253,7 @@ void do_m68k_semihosting(CPUM68KState *env, int nr)
GET_ARG(2);
GET_ARG(3);
if (use_gdb_syscalls()) {
- gdb_do_syscall(m68k_semi_cb, "rename,%s,%s",
+ gdb_do_syscall(m68k_semi_u32_cb, "rename,%s,%s",
arg0, (int)arg1, arg2, (int)arg3);
return;
} else {
@@ -282,7 +273,7 @@ void do_m68k_semihosting(CPUM68KState *env, int nr)
GET_ARG(0);
GET_ARG(1);
if (use_gdb_syscalls()) {
- gdb_do_syscall(m68k_semi_cb, "unlink,%s",
+ gdb_do_syscall(m68k_semi_u32_cb, "unlink,%s",
arg0, (int)arg1);
return;
} else {
@@ -301,7 +292,7 @@ void do_m68k_semihosting(CPUM68KState *env, int nr)
GET_ARG(1);
GET_ARG(2);
if (use_gdb_syscalls()) {
- gdb_do_syscall(m68k_semi_cb, "stat,%s,%x",
+ gdb_do_syscall(m68k_semi_u32_cb, "stat,%s,%x",
arg0, (int)arg1, arg2);
return;
} else {
@@ -323,7 +314,7 @@ void do_m68k_semihosting(CPUM68KState *env, int nr)
GET_ARG(0);
GET_ARG(1);
if (use_gdb_syscalls()) {
- gdb_do_syscall(m68k_semi_cb, "fstat,%x,%x",
+ gdb_do_syscall(m68k_semi_u32_cb, "fstat,%x,%x",
arg0, arg1);
return;
} else {
@@ -338,7 +329,7 @@ void do_m68k_semihosting(CPUM68KState *env, int nr)
GET_ARG(0);
GET_ARG(1);
if (use_gdb_syscalls()) {
- gdb_do_syscall(m68k_semi_cb, "gettimeofday,%x,%x",
+ gdb_do_syscall(m68k_semi_u32_cb, "gettimeofday,%x,%x",
arg0, arg1);
return;
} else {
@@ -359,7 +350,7 @@ void do_m68k_semihosting(CPUM68KState *env, int nr)
case HOSTED_ISATTY:
GET_ARG(0);
if (use_gdb_syscalls()) {
- gdb_do_syscall(m68k_semi_cb, "isatty,%x", arg0);
+ gdb_do_syscall(m68k_semi_u32_cb, "isatty,%x", arg0);
return;
} else {
result = isatty(arg0);
@@ -369,7 +360,7 @@ void do_m68k_semihosting(CPUM68KState *env, int nr)
GET_ARG(0);
GET_ARG(1);
if (use_gdb_syscalls()) {
- gdb_do_syscall(m68k_semi_cb, "system,%s",
+ gdb_do_syscall(m68k_semi_u32_cb, "system,%s",
arg0, (int)arg1);
return;
} else {
@@ -427,5 +418,5 @@ void do_m68k_semihosting(CPUM68KState *env, int nr)
result = 0;
}
failed:
- m68k_semi_return_u32(env, result, errno);
+ m68k_semi_u32_cb(cs, result, errno);
}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 35/43] target/m68k: Make semihosting system only
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (33 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 34/43] target/m68k: Eliminate m68k_semi_is_fseek Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 36/43] target/m68k: Use guestfd.h to implement syscalls Richard Henderson
` (8 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
While we had a call to do_m68k_semihosting in linux-user, it
wasn't actually reachable. We don't include DISAS_INSN(halt)
as an instruction unless system mode.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
linux-user/m68k/cpu_loop.c | 5 -----
target/m68k/m68k-semi.c | 37 +------------------------------------
target/m68k/meson.build | 6 ++++--
3 files changed, 5 insertions(+), 43 deletions(-)
diff --git a/linux-user/m68k/cpu_loop.c b/linux-user/m68k/cpu_loop.c
index d1bf8548b7..fa6aa112cb 100644
--- a/linux-user/m68k/cpu_loop.c
+++ b/linux-user/m68k/cpu_loop.c
@@ -36,11 +36,6 @@ void cpu_loop(CPUM68KState *env)
process_queued_cpu_work(cs);
switch(trapnr) {
- case EXCP_HALT_INSN:
- /* Semihosing syscall. */
- env->pc += 4;
- do_m68k_semihosting(env, env->dregs[0]);
- break;
case EXCP_ILLEGAL:
case EXCP_LINEA:
case EXCP_LINEF:
diff --git a/target/m68k/m68k-semi.c b/target/m68k/m68k-semi.c
index 5b4c51957e..4b5621a101 100644
--- a/target/m68k/m68k-semi.c
+++ b/target/m68k/m68k-semi.c
@@ -21,13 +21,9 @@
#include "cpu.h"
#include "exec/gdbstub.h"
-#if defined(CONFIG_USER_ONLY)
-#include "qemu.h"
-#define SEMIHOSTING_HEAP_SIZE (128 * 1024 * 1024)
-#else
+#include "semihosting/guestfd.h"
#include "semihosting/softmmu-uaccess.h"
#include "hw/boards.h"
-#endif
#include "qemu/log.h"
#define HOSTED_EXIT 0
@@ -375,43 +371,12 @@ void do_m68k_semihosting(CPUM68KState *env, int nr)
}
break;
case HOSTED_INIT_SIM:
-#if defined(CONFIG_USER_ONLY)
- {
- CPUState *cs = env_cpu(env);
- TaskState *ts = cs->opaque;
- /* Allocate the heap using sbrk. */
- if (!ts->heap_limit) {
- abi_ulong ret;
- uint32_t size;
- uint32_t base;
-
- base = do_brk(0);
- size = SEMIHOSTING_HEAP_SIZE;
- /* Try a big heap, and reduce the size if that fails. */
- for (;;) {
- ret = do_brk(base + size);
- if (ret >= (base + size)) {
- break;
- }
- size >>= 1;
- }
- ts->heap_limit = base + size;
- }
- /*
- * This call may happen before we have writable memory, so return
- * values directly in registers.
- */
- env->dregs[1] = ts->heap_limit;
- env->aregs[7] = ts->stack_base;
- }
-#else
/*
* FIXME: This is wrong for boards where RAM does not start at
* address zero.
*/
env->dregs[1] = current_machine->ram_size;
env->aregs[7] = current_machine->ram_size;
-#endif
return;
default:
cpu_abort(env_cpu(env), "Unsupported semihosting syscall %d\n", nr);
diff --git a/target/m68k/meson.build b/target/m68k/meson.build
index 05cd9fbd1e..27d2d7ba87 100644
--- a/target/m68k/meson.build
+++ b/target/m68k/meson.build
@@ -4,14 +4,16 @@ m68k_ss.add(files(
'fpu_helper.c',
'gdbstub.c',
'helper.c',
- 'm68k-semi.c',
'op_helper.c',
'softfloat.c',
'translate.c',
))
m68k_softmmu_ss = ss.source_set()
-m68k_softmmu_ss.add(files('monitor.c'))
+m68k_softmmu_ss.add(files(
+ 'm68k-semi.c',
+ 'monitor.c'
+))
target_arch += {'m68k': m68k_ss}
target_softmmu_arch += {'m68k': m68k_softmmu_ss}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 36/43] target/m68k: Use guestfd.h to implement syscalls.
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (34 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 35/43] target/m68k: Make semihosting system only Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 37/43] target/m68k: Do semihosting call as a normal helper Richard Henderson
` (7 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
This separates guest file descriptors from host file descriptors,
and utilizes shared infrastructure for integration with gdbstub.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/m68k/m68k-semi.c | 268 ++++++----------------------------------
1 file changed, 38 insertions(+), 230 deletions(-)
diff --git a/target/m68k/m68k-semi.c b/target/m68k/m68k-semi.c
index 4b5621a101..71f9d42e6c 100644
--- a/target/m68k/m68k-semi.c
+++ b/target/m68k/m68k-semi.c
@@ -41,54 +41,6 @@
#define HOSTED_ISATTY 12
#define HOSTED_SYSTEM 13
-static int translate_openflags(int flags)
-{
- int hf;
-
- if (flags & GDB_O_WRONLY)
- hf = O_WRONLY;
- else if (flags & GDB_O_RDWR)
- hf = O_RDWR;
- else
- hf = O_RDONLY;
-
- if (flags & GDB_O_APPEND) hf |= O_APPEND;
- if (flags & GDB_O_CREAT) hf |= O_CREAT;
- if (flags & GDB_O_TRUNC) hf |= O_TRUNC;
- if (flags & GDB_O_EXCL) hf |= O_EXCL;
-
- return hf;
-}
-
-static void translate_stat(CPUM68KState *env, target_ulong addr, struct stat *s)
-{
- struct gdb_stat *p;
-
- if (!(p = lock_user(VERIFY_WRITE, addr, sizeof(struct gdb_stat), 0)))
- /* FIXME - should this return an error code? */
- return;
- p->gdb_st_dev = cpu_to_be32(s->st_dev);
- p->gdb_st_ino = cpu_to_be32(s->st_ino);
- p->gdb_st_mode = cpu_to_be32(s->st_mode);
- p->gdb_st_nlink = cpu_to_be32(s->st_nlink);
- p->gdb_st_uid = cpu_to_be32(s->st_uid);
- p->gdb_st_gid = cpu_to_be32(s->st_gid);
- p->gdb_st_rdev = cpu_to_be32(s->st_rdev);
- p->gdb_st_size = cpu_to_be64(s->st_size);
-#ifdef _WIN32
- /* Windows stat is missing some fields. */
- p->gdb_st_blksize = 0;
- p->gdb_st_blocks = 0;
-#else
- p->gdb_st_blksize = cpu_to_be64(s->st_blksize);
- p->gdb_st_blocks = cpu_to_be64(s->st_blocks);
-#endif
- p->gdb_st_atime = cpu_to_be32(s->st_atime);
- p->gdb_st_mtime = cpu_to_be32(s->st_mtime);
- p->gdb_st_ctime = cpu_to_be32(s->st_ctime);
- unlock_user(p, addr, sizeof(struct gdb_stat));
-}
-
static void m68k_semi_u32_cb(CPUState *cs, uint64_t ret, int err)
{
M68kCPU *cpu = M68K_CPU(cs);
@@ -128,8 +80,6 @@ static void m68k_semi_u64_cb(CPUState *cs, uint64_t ret, int err)
*/
#define GET_ARG(n) do { \
if (get_user_ual(arg ## n, args + (n) * 4)) { \
- result = -1; \
- errno = EFAULT; \
goto failed; \
} \
} while (0)
@@ -139,237 +89,93 @@ void do_m68k_semihosting(CPUM68KState *env, int nr)
CPUState *cs = env_cpu(env);
uint32_t args;
target_ulong arg0, arg1, arg2, arg3;
- void *p;
- void *q;
- uint32_t len;
- uint32_t result;
args = env->dregs[1];
switch (nr) {
case HOSTED_EXIT:
gdb_exit(env->dregs[0]);
exit(env->dregs[0]);
+
case HOSTED_OPEN:
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
GET_ARG(3);
- if (use_gdb_syscalls()) {
- gdb_do_syscall(m68k_semi_u32_cb, "open,%s,%x,%x", arg0, (int)arg1,
- arg2, arg3);
- return;
- } else {
- p = lock_user_string(arg0);
- if (!p) {
- /* FIXME - check error code? */
- result = -1;
- } else {
- result = open(p, translate_openflags(arg2), arg3);
- unlock_user(p, arg0, 0);
- }
- }
+ semihost_sys_open(cs, m68k_semi_u32_cb, arg0, arg1, arg2, arg3);
break;
+
case HOSTED_CLOSE:
- {
- /* Ignore attempts to close stdin/out/err. */
- GET_ARG(0);
- int fd = arg0;
- if (fd > 2) {
- if (use_gdb_syscalls()) {
- gdb_do_syscall(m68k_semi_u32_cb, "close,%x", arg0);
- return;
- } else {
- result = close(fd);
- }
- } else {
- result = 0;
- }
- break;
- }
+ GET_ARG(0);
+ semihost_sys_close(cs, m68k_semi_u32_cb, arg0);
+ break;
+
case HOSTED_READ:
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
- len = arg2;
- if (use_gdb_syscalls()) {
- gdb_do_syscall(m68k_semi_u32_cb, "read,%x,%x,%x",
- arg0, arg1, len);
- return;
- } else {
- p = lock_user(VERIFY_WRITE, arg1, len, 0);
- if (!p) {
- /* FIXME - check error code? */
- result = -1;
- } else {
- result = read(arg0, p, len);
- unlock_user(p, arg1, len);
- }
- }
+ semihost_sys_read(cs, m68k_semi_u32_cb, arg0, arg1, arg2);
break;
+
case HOSTED_WRITE:
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
- len = arg2;
- if (use_gdb_syscalls()) {
- gdb_do_syscall(m68k_semi_u32_cb, "write,%x,%x,%x",
- arg0, arg1, len);
- return;
- } else {
- p = lock_user(VERIFY_READ, arg1, len, 1);
- if (!p) {
- /* FIXME - check error code? */
- result = -1;
- } else {
- result = write(arg0, p, len);
- unlock_user(p, arg0, 0);
- }
- }
+ semihost_sys_write(cs, m68k_semi_u32_cb, arg0, arg1, arg2);
break;
+
case HOSTED_LSEEK:
- {
- uint64_t off;
- GET_ARG(0);
- GET_ARG(1);
- GET_ARG(2);
- GET_ARG(3);
- off = (uint32_t)arg2 | ((uint64_t)arg1 << 32);
- if (use_gdb_syscalls()) {
- gdb_do_syscall(m68k_semi_u64_cb, "fseek,%x,%lx,%x",
- arg0, off, arg3);
- } else {
- off = lseek(arg0, off, arg3);
- m68k_semi_u64_cb(cs, off, errno);
- }
- return;
- }
+ GET_ARG(0);
+ GET_ARG(1);
+ GET_ARG(2);
+ GET_ARG(3);
+ semihost_sys_lseek(cs, m68k_semi_u64_cb, arg0,
+ deposit64(arg2, arg1, 32, 32), arg3);
+ break;
+
case HOSTED_RENAME:
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
GET_ARG(3);
- if (use_gdb_syscalls()) {
- gdb_do_syscall(m68k_semi_u32_cb, "rename,%s,%s",
- arg0, (int)arg1, arg2, (int)arg3);
- return;
- } else {
- p = lock_user_string(arg0);
- q = lock_user_string(arg2);
- if (!p || !q) {
- /* FIXME - check error code? */
- result = -1;
- } else {
- result = rename(p, q);
- }
- unlock_user(p, arg0, 0);
- unlock_user(q, arg2, 0);
- }
+ semihost_sys_rename(cs, m68k_semi_u32_cb, arg0, arg1, arg2, arg3);
break;
+
case HOSTED_UNLINK:
GET_ARG(0);
GET_ARG(1);
- if (use_gdb_syscalls()) {
- gdb_do_syscall(m68k_semi_u32_cb, "unlink,%s",
- arg0, (int)arg1);
- return;
- } else {
- p = lock_user_string(arg0);
- if (!p) {
- /* FIXME - check error code? */
- result = -1;
- } else {
- result = unlink(p);
- unlock_user(p, arg0, 0);
- }
- }
+ semihost_sys_remove(cs, m68k_semi_u32_cb, arg0, arg1);
break;
+
case HOSTED_STAT:
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
- if (use_gdb_syscalls()) {
- gdb_do_syscall(m68k_semi_u32_cb, "stat,%s,%x",
- arg0, (int)arg1, arg2);
- return;
- } else {
- struct stat s;
- p = lock_user_string(arg0);
- if (!p) {
- /* FIXME - check error code? */
- result = -1;
- } else {
- result = stat(p, &s);
- unlock_user(p, arg0, 0);
- }
- if (result == 0) {
- translate_stat(env, arg2, &s);
- }
- }
+ semihost_sys_stat(cs, m68k_semi_u32_cb, arg0, arg1, arg2);
break;
+
case HOSTED_FSTAT:
GET_ARG(0);
GET_ARG(1);
- if (use_gdb_syscalls()) {
- gdb_do_syscall(m68k_semi_u32_cb, "fstat,%x,%x",
- arg0, arg1);
- return;
- } else {
- struct stat s;
- result = fstat(arg0, &s);
- if (result == 0) {
- translate_stat(env, arg1, &s);
- }
- }
+ semihost_sys_fstat(cs, m68k_semi_u32_cb, arg0, arg1);
break;
+
case HOSTED_GETTIMEOFDAY:
GET_ARG(0);
GET_ARG(1);
- if (use_gdb_syscalls()) {
- gdb_do_syscall(m68k_semi_u32_cb, "gettimeofday,%x,%x",
- arg0, arg1);
- return;
- } else {
- struct gdb_timeval *p;
- int64_t rt = g_get_real_time();
- p = lock_user(VERIFY_WRITE, arg0, sizeof(struct gdb_timeval), 0);
- if (!p) {
- /* FIXME - check error code? */
- result = -1;
- } else {
- result = 0;
- p->tv_sec = cpu_to_be32(rt / G_USEC_PER_SEC);
- p->tv_usec = cpu_to_be64(rt % G_USEC_PER_SEC);
- unlock_user(p, arg0, sizeof(struct gdb_timeval));
- }
- }
+ semihost_sys_gettimeofday(cs, m68k_semi_u32_cb, arg0, arg1);
break;
+
case HOSTED_ISATTY:
GET_ARG(0);
- if (use_gdb_syscalls()) {
- gdb_do_syscall(m68k_semi_u32_cb, "isatty,%x", arg0);
- return;
- } else {
- result = isatty(arg0);
- }
+ semihost_sys_isatty(cs, m68k_semi_u32_cb, arg0);
break;
+
case HOSTED_SYSTEM:
GET_ARG(0);
GET_ARG(1);
- if (use_gdb_syscalls()) {
- gdb_do_syscall(m68k_semi_u32_cb, "system,%s",
- arg0, (int)arg1);
- return;
- } else {
- p = lock_user_string(arg0);
- if (!p) {
- /* FIXME - check error code? */
- result = -1;
- } else {
- result = system(p);
- unlock_user(p, arg0, 0);
- }
- }
+ semihost_sys_system(cs, m68k_semi_u32_cb, arg0, arg1);
break;
+
case HOSTED_INIT_SIM:
/*
* FIXME: This is wrong for boards where RAM does not start at
@@ -378,10 +184,12 @@ void do_m68k_semihosting(CPUM68KState *env, int nr)
env->dregs[1] = current_machine->ram_size;
env->aregs[7] = current_machine->ram_size;
return;
+
default:
cpu_abort(env_cpu(env), "Unsupported semihosting syscall %d\n", nr);
- result = 0;
+
+ failed:
+ m68k_semi_u32_cb(cs, -1, EFAULT);
+ break;
}
-failed:
- m68k_semi_u32_cb(cs, result, errno);
}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 37/43] target/m68k: Do semihosting call as a normal helper
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (35 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 36/43] target/m68k: Use guestfd.h to implement syscalls Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 38/43] target/m68k: Enable semihosting for non-coldfire Richard Henderson
` (6 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
There's no need to raise an exception; just call the
helper function directly. The test for the required
surrounding insns is easier as well.
Move the load of nr inside the helper.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/m68k/cpu.h | 2 --
target/m68k/helper.h | 1 +
target/m68k/m68k-semi.c | 6 ++++--
target/m68k/op_helper.c | 10 ----------
target/m68k/translate.c | 26 +++++++++++++++++++++++++-
5 files changed, 30 insertions(+), 15 deletions(-)
diff --git a/target/m68k/cpu.h b/target/m68k/cpu.h
index 9b3bf7a448..60f88e6bc9 100644
--- a/target/m68k/cpu.h
+++ b/target/m68k/cpu.h
@@ -456,8 +456,6 @@ typedef enum {
void m68k_set_irq_level(M68kCPU *cpu, int level, uint8_t vector);
void m68k_switch_sp(CPUM68KState *env);
-void do_m68k_semihosting(CPUM68KState *env, int nr);
-
/*
* The 68000 family is defined in six main CPU classes, the 680[012346]0.
* Generally each successive CPU adds enhanced data/stack/instructions.
diff --git a/target/m68k/helper.h b/target/m68k/helper.h
index 0a6b4146f6..0e27c27810 100644
--- a/target/m68k/helper.h
+++ b/target/m68k/helper.h
@@ -128,4 +128,5 @@ DEF_HELPER_4(chk2, void, env, s32, s32, s32)
DEF_HELPER_3(ptest, void, env, i32, i32)
DEF_HELPER_3(pflush, void, env, i32, i32)
DEF_HELPER_FLAGS_1(reset, TCG_CALL_NO_RWG, void, env)
+DEF_HELPER_1(semihosting, void, env)
#endif
diff --git a/target/m68k/m68k-semi.c b/target/m68k/m68k-semi.c
index 71f9d42e6c..1a36c1158d 100644
--- a/target/m68k/m68k-semi.c
+++ b/target/m68k/m68k-semi.c
@@ -25,6 +25,7 @@
#include "semihosting/softmmu-uaccess.h"
#include "hw/boards.h"
#include "qemu/log.h"
+#include "exec/helper-proto.h"
#define HOSTED_EXIT 0
#define HOSTED_INIT_SIM 1
@@ -84,12 +85,13 @@ static void m68k_semi_u64_cb(CPUState *cs, uint64_t ret, int err)
} \
} while (0)
-void do_m68k_semihosting(CPUM68KState *env, int nr)
+void HELPER(semihosting)(CPUM68KState *env)
{
CPUState *cs = env_cpu(env);
- uint32_t args;
+ uint32_t args, nr;
target_ulong arg0, arg1, arg2, arg3;
+ nr = env->dregs[0];
args = env->dregs[1];
switch (nr) {
case HOSTED_EXIT:
diff --git a/target/m68k/op_helper.c b/target/m68k/op_helper.c
index 8decc61240..a345245612 100644
--- a/target/m68k/op_helper.c
+++ b/target/m68k/op_helper.c
@@ -22,7 +22,6 @@
#include "exec/helper-proto.h"
#include "exec/exec-all.h"
#include "exec/cpu_ldst.h"
-#include "semihosting/semihost.h"
#if !defined(CONFIG_USER_ONLY)
@@ -203,15 +202,6 @@ static void cf_interrupt_all(CPUM68KState *env, int is_hw)
cf_rte(env);
return;
case EXCP_HALT_INSN:
- if (semihosting_enabled()
- && (env->sr & SR_S) != 0
- && (env->pc & 3) == 0
- && cpu_lduw_code(env, env->pc - 4) == 0x4e71
- && cpu_ldl_code(env, env->pc) == 0x4e7bf000) {
- env->pc += 4;
- do_m68k_semihosting(env, env->dregs[0]);
- return;
- }
cs->halted = 1;
cs->exception_index = EXCP_HLT;
cpu_loop_exit(cs);
diff --git a/target/m68k/translate.c b/target/m68k/translate.c
index 4026572ed8..b7adc8f53d 100644
--- a/target/m68k/translate.c
+++ b/target/m68k/translate.c
@@ -33,6 +33,9 @@
#include "exec/log.h"
#include "fpu/softfloat.h"
+#ifndef CONFIG_USER_ONLY
+#include "semihosting/semihost.h"
+#endif
//#define DEBUG_DISPATCH 1
@@ -313,6 +316,25 @@ static inline void gen_addr_fault(DisasContext *s)
gen_exception(s, s->base.pc_next, EXCP_ADDRESS);
}
+#ifndef CONFIG_USER_ONLY
+static bool maybe_semihosting(DisasContext *s)
+{
+ /*
+ * The semihosting insn (halt or bkpt) is preceeded by an aligned NOP
+ * and followed by an invalid sentinel insn (movec %sp,0).
+ */
+ if (semihosting_enabled()
+ && (s->pc & 3) == 2
+ && cpu_lduw_code(s->env, s->pc - 2) == 0x4e71
+ && cpu_ldl_code(s->env, s->pc + 4) == 0x4e7bf000) {
+ gen_helper_semihosting(cpu_env);
+ s->pc += 4;
+ return true;
+ }
+ return false;
+}
+#endif
+
/*
* Generate a load from the specified address. Narrow values are
* sign extended to full register width.
@@ -4702,7 +4724,9 @@ DISAS_INSN(halt)
gen_exception(s, s->base.pc_next, EXCP_PRIVILEGE);
return;
}
-
+ if (maybe_semihosting(s)) {
+ return;
+ }
gen_exception(s, s->pc, EXCP_HALT_INSN);
}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 38/43] target/m68k: Enable semihosting for non-coldfire
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (36 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 37/43] target/m68k: Do semihosting call as a normal helper Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 39/43] target/m68k: Remove EXCP_HALT_INSN Richard Henderson
` (5 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
The libgloss m68k-semi.txt spec says that bkpt #0 may be
used when the halt insn is not available. While halt is
available for 68060, continue to support bkpt #0 for all
m68k processors.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/m68k/translate.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/target/m68k/translate.c b/target/m68k/translate.c
index b7adc8f53d..51c546f26f 100644
--- a/target/m68k/translate.c
+++ b/target/m68k/translate.c
@@ -2775,6 +2775,15 @@ DISAS_INSN(swap)
DISAS_INSN(bkpt)
{
+#ifndef CONFIG_USER_ONLY
+ /* The non-ColdFire semihosting insn is bkpt #0. */
+ if (!m68k_feature(s->env, M68K_FEATURE_CF_ISA_A)
+ && !IS_USER(s)
+ && (insn & 7) == 0
+ && maybe_semihosting(s)) {
+ return;
+ }
+#endif
gen_exception(s, s->base.pc_next, EXCP_DEBUG);
}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 39/43] target/m68k: Remove EXCP_HALT_INSN
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (37 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 38/43] target/m68k: Enable semihosting for non-coldfire Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 40/43] target/nios2: Eliminate nios2_semi_is_lseek Richard Henderson
` (4 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
Now that semihosting is not attached to EXCP_HALT_INSN,
we can use EXCP_HLT.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/m68k/cpu.h | 1 -
target/m68k/op_helper.c | 5 -----
target/m68k/translate.c | 3 ++-
3 files changed, 2 insertions(+), 7 deletions(-)
diff --git a/target/m68k/cpu.h b/target/m68k/cpu.h
index 60f88e6bc9..f10554318b 100644
--- a/target/m68k/cpu.h
+++ b/target/m68k/cpu.h
@@ -66,7 +66,6 @@
#define EXCP_MMU_ACCESS 58 /* MMU Access Level Violation Error */
#define EXCP_RTE 0x100
-#define EXCP_HALT_INSN 0x101
#define M68K_DTTR0 0
#define M68K_DTTR1 1
diff --git a/target/m68k/op_helper.c b/target/m68k/op_helper.c
index a345245612..6218ac791b 100644
--- a/target/m68k/op_helper.c
+++ b/target/m68k/op_helper.c
@@ -201,11 +201,6 @@ static void cf_interrupt_all(CPUM68KState *env, int is_hw)
/* Return from an exception. */
cf_rte(env);
return;
- case EXCP_HALT_INSN:
- cs->halted = 1;
- cs->exception_index = EXCP_HLT;
- cpu_loop_exit(cs);
- return;
}
if (cs->exception_index >= EXCP_TRAP0
&& cs->exception_index <= EXCP_TRAP15) {
diff --git a/target/m68k/translate.c b/target/m68k/translate.c
index 51c546f26f..354a127e1a 100644
--- a/target/m68k/translate.c
+++ b/target/m68k/translate.c
@@ -4736,7 +4736,8 @@ DISAS_INSN(halt)
if (maybe_semihosting(s)) {
return;
}
- gen_exception(s, s->pc, EXCP_HALT_INSN);
+ tcg_gen_movi_i32(cpu_halted, 1);
+ gen_exception(s, s->pc, EXCP_HLT);
}
DISAS_INSN(stop)
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 40/43] target/nios2: Eliminate nios2_semi_is_lseek
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (38 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 39/43] target/m68k: Remove EXCP_HALT_INSN Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 41/43] target/nios2: Move nios2-semi.c to nios2_softmmu_ss Richard Henderson
` (3 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
Reorg nios2_semi_return_* to gdb_syscall_complete_cb.
Use the 32-bit version normally, and the 64-bit version
for HOSTED_LSEEK.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/nios2/nios2-semi.c | 59 +++++++++++++++------------------------
1 file changed, 23 insertions(+), 36 deletions(-)
diff --git a/target/nios2/nios2-semi.c b/target/nios2/nios2-semi.c
index 4d02789d26..bdf8849689 100644
--- a/target/nios2/nios2-semi.c
+++ b/target/nios2/nios2-semi.c
@@ -108,9 +108,12 @@ static bool translate_stat(CPUNios2State *env, target_ulong addr,
return true;
}
-static void nios2_semi_return_u32(CPUNios2State *env, uint32_t ret, int err)
+static void nios2_semi_u32_cb(CPUState *cs, uint64_t ret, int err)
{
+ Nios2CPU *cpu = NIOS2_CPU(cs);
+ CPUNios2State *env = &cpu->env;
target_ulong args = env->regs[R_ARG1];
+
if (put_user_u32(ret, args) ||
put_user_u32(err, args + 4)) {
/*
@@ -123,9 +126,12 @@ static void nios2_semi_return_u32(CPUNios2State *env, uint32_t ret, int err)
}
}
-static void nios2_semi_return_u64(CPUNios2State *env, uint64_t ret, int err)
+static void nios2_semi_u64_cb(CPUState *cs, uint64_t ret, int err)
{
+ Nios2CPU *cpu = NIOS2_CPU(cs);
+ CPUNios2State *env = &cpu->env;
target_ulong args = env->regs[R_ARG1];
+
if (put_user_u32(ret >> 32, args) ||
put_user_u32(ret, args + 4) ||
put_user_u32(err, args + 8)) {
@@ -135,25 +141,6 @@ static void nios2_semi_return_u64(CPUNios2State *env, uint64_t ret, int err)
}
}
-static int nios2_semi_is_lseek;
-
-static void nios2_semi_cb(CPUState *cs, uint64_t ret, int err)
-{
- Nios2CPU *cpu = NIOS2_CPU(cs);
- CPUNios2State *env = &cpu->env;
-
- if (nios2_semi_is_lseek) {
- /*
- * FIXME: We've already lost the high bits of the lseek
- * return value.
- */
- nios2_semi_return_u64(env, ret, err);
- nios2_semi_is_lseek = 0;
- } else {
- nios2_semi_return_u32(env, ret, err);
- }
-}
-
/*
* Read the input value from the argument block; fail the semihosting
* call if the memory read fails.
@@ -168,6 +155,7 @@ static void nios2_semi_cb(CPUState *cs, uint64_t ret, int err)
void do_nios2_semihosting(CPUNios2State *env)
{
+ CPUState *cs = env_cpu(env);
int nr;
uint32_t args;
target_ulong arg0, arg1, arg2, arg3;
@@ -188,7 +176,7 @@ void do_nios2_semihosting(CPUNios2State *env)
GET_ARG(2);
GET_ARG(3);
if (use_gdb_syscalls()) {
- gdb_do_syscall(nios2_semi_cb, "open,%s,%x,%x", arg0, (int)arg1,
+ gdb_do_syscall(nios2_semi_u32_cb, "open,%s,%x,%x", arg0, (int)arg1,
arg2, arg3);
return;
} else {
@@ -209,7 +197,7 @@ void do_nios2_semihosting(CPUNios2State *env)
int fd = arg0;
if (fd > 2) {
if (use_gdb_syscalls()) {
- gdb_do_syscall(nios2_semi_cb, "close,%x", arg0);
+ gdb_do_syscall(nios2_semi_u32_cb, "close,%x", arg0);
return;
} else {
result = close(fd);
@@ -225,7 +213,7 @@ void do_nios2_semihosting(CPUNios2State *env)
GET_ARG(2);
len = arg2;
if (use_gdb_syscalls()) {
- gdb_do_syscall(nios2_semi_cb, "read,%x,%x,%x",
+ gdb_do_syscall(nios2_semi_u32_cb, "read,%x,%x,%x",
arg0, arg1, len);
return;
} else {
@@ -245,7 +233,7 @@ void do_nios2_semihosting(CPUNios2State *env)
GET_ARG(2);
len = arg2;
if (use_gdb_syscalls()) {
- gdb_do_syscall(nios2_semi_cb, "write,%x,%x,%x",
+ gdb_do_syscall(nios2_semi_u32_cb, "write,%x,%x,%x",
arg0, arg1, len);
return;
} else {
@@ -268,12 +256,11 @@ void do_nios2_semihosting(CPUNios2State *env)
GET_ARG(3);
off = (uint32_t)arg2 | ((uint64_t)arg1 << 32);
if (use_gdb_syscalls()) {
- nios2_semi_is_lseek = 1;
- gdb_do_syscall(nios2_semi_cb, "lseek,%x,%lx,%x",
+ gdb_do_syscall(nios2_semi_u64_cb, "lseek,%x,%lx,%x",
arg0, off, arg3);
} else {
off = lseek(arg0, off, arg3);
- nios2_semi_return_u64(env, off, errno);
+ nios2_semi_u64_cb(cs, off, errno);
}
return;
}
@@ -283,7 +270,7 @@ void do_nios2_semihosting(CPUNios2State *env)
GET_ARG(2);
GET_ARG(3);
if (use_gdb_syscalls()) {
- gdb_do_syscall(nios2_semi_cb, "rename,%s,%s",
+ gdb_do_syscall(nios2_semi_u32_cb, "rename,%s,%s",
arg0, (int)arg1, arg2, (int)arg3);
return;
} else {
@@ -303,7 +290,7 @@ void do_nios2_semihosting(CPUNios2State *env)
GET_ARG(0);
GET_ARG(1);
if (use_gdb_syscalls()) {
- gdb_do_syscall(nios2_semi_cb, "unlink,%s",
+ gdb_do_syscall(nios2_semi_u32_cb, "unlink,%s",
arg0, (int)arg1);
return;
} else {
@@ -322,7 +309,7 @@ void do_nios2_semihosting(CPUNios2State *env)
GET_ARG(1);
GET_ARG(2);
if (use_gdb_syscalls()) {
- gdb_do_syscall(nios2_semi_cb, "stat,%s,%x",
+ gdb_do_syscall(nios2_semi_u32_cb, "stat,%s,%x",
arg0, (int)arg1, arg2);
return;
} else {
@@ -345,7 +332,7 @@ void do_nios2_semihosting(CPUNios2State *env)
GET_ARG(0);
GET_ARG(1);
if (use_gdb_syscalls()) {
- gdb_do_syscall(nios2_semi_cb, "fstat,%x,%x",
+ gdb_do_syscall(nios2_semi_u32_cb, "fstat,%x,%x",
arg0, arg1);
return;
} else {
@@ -361,7 +348,7 @@ void do_nios2_semihosting(CPUNios2State *env)
/* Only the tv parameter is used. tz is assumed NULL. */
GET_ARG(0);
if (use_gdb_syscalls()) {
- gdb_do_syscall(nios2_semi_cb, "gettimeofday,%x,%x",
+ gdb_do_syscall(nios2_semi_u32_cb, "gettimeofday,%x,%x",
arg0, 0);
return;
} else {
@@ -382,7 +369,7 @@ void do_nios2_semihosting(CPUNios2State *env)
case HOSTED_ISATTY:
GET_ARG(0);
if (use_gdb_syscalls()) {
- gdb_do_syscall(nios2_semi_cb, "isatty,%x", arg0);
+ gdb_do_syscall(nios2_semi_u32_cb, "isatty,%x", arg0);
return;
} else {
result = isatty(arg0);
@@ -392,7 +379,7 @@ void do_nios2_semihosting(CPUNios2State *env)
GET_ARG(0);
GET_ARG(1);
if (use_gdb_syscalls()) {
- gdb_do_syscall(nios2_semi_cb, "system,%s",
+ gdb_do_syscall(nios2_semi_u32_cb, "system,%s",
arg0, (int)arg1);
return;
} else {
@@ -412,5 +399,5 @@ void do_nios2_semihosting(CPUNios2State *env)
result = 0;
}
failed:
- nios2_semi_return_u32(env, result, errno);
+ nios2_semi_u32_cb(cs, result, errno);
}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 41/43] target/nios2: Move nios2-semi.c to nios2_softmmu_ss
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (39 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 40/43] target/nios2: Eliminate nios2_semi_is_lseek Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 42/43] target/nios2: Use guestfd.h to implement syscalls Richard Henderson
` (2 subsequent siblings)
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
Semihosting is not enabled for nios2-linux-user.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/nios2/meson.build | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/target/nios2/meson.build b/target/nios2/meson.build
index 2bd60ba306..c6e2243cc3 100644
--- a/target/nios2/meson.build
+++ b/target/nios2/meson.build
@@ -1,7 +1,6 @@
nios2_ss = ss.source_set()
nios2_ss.add(files(
'cpu.c',
- 'nios2-semi.c',
'op_helper.c',
'translate.c',
))
@@ -10,7 +9,8 @@ nios2_softmmu_ss = ss.source_set()
nios2_softmmu_ss.add(files(
'helper.c',
'monitor.c',
- 'mmu.c'
+ 'mmu.c',
+ 'nios2-semi.c',
))
target_arch += {'nios2': nios2_ss}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 42/43] target/nios2: Use guestfd.h to implement syscalls.
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (40 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 41/43] target/nios2: Move nios2-semi.c to nios2_softmmu_ss Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-04-30 13:29 ` [PATCH 43/43] target/nios2: Do semihosting call as a normal helper Richard Henderson
2022-05-01 7:02 ` [PATCH 00/43] semihosting cleanup Richard Henderson
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
This separates guest file descriptors from host file descriptors,
and utilizes shared infrastructure for integration with gdbstub.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/nios2/nios2-semi.c | 287 ++++++--------------------------------
1 file changed, 41 insertions(+), 246 deletions(-)
diff --git a/target/nios2/nios2-semi.c b/target/nios2/nios2-semi.c
index bdf8849689..3dad72d1f6 100644
--- a/target/nios2/nios2-semi.c
+++ b/target/nios2/nios2-semi.c
@@ -25,6 +25,7 @@
#include "cpu.h"
#include "exec/gdbstub.h"
+#include "semihosting/guestfd.h"
#if defined(CONFIG_USER_ONLY)
#include "qemu.h"
#else
@@ -47,67 +48,6 @@
#define HOSTED_ISATTY 12
#define HOSTED_SYSTEM 13
-static int translate_openflags(int flags)
-{
- int hf;
-
- if (flags & GDB_O_WRONLY) {
- hf = O_WRONLY;
- } else if (flags & GDB_O_RDWR) {
- hf = O_RDWR;
- } else {
- hf = O_RDONLY;
- }
-
- if (flags & GDB_O_APPEND) {
- hf |= O_APPEND;
- }
- if (flags & GDB_O_CREAT) {
- hf |= O_CREAT;
- }
- if (flags & GDB_O_TRUNC) {
- hf |= O_TRUNC;
- }
- if (flags & GDB_O_EXCL) {
- hf |= O_EXCL;
- }
-
- return hf;
-}
-
-static bool translate_stat(CPUNios2State *env, target_ulong addr,
- struct stat *s)
-{
- struct gdb_stat *p;
-
- p = lock_user(VERIFY_WRITE, addr, sizeof(struct gdb_stat), 0);
-
- if (!p) {
- return false;
- }
- p->gdb_st_dev = cpu_to_be32(s->st_dev);
- p->gdb_st_ino = cpu_to_be32(s->st_ino);
- p->gdb_st_mode = cpu_to_be32(s->st_mode);
- p->gdb_st_nlink = cpu_to_be32(s->st_nlink);
- p->gdb_st_uid = cpu_to_be32(s->st_uid);
- p->gdb_st_gid = cpu_to_be32(s->st_gid);
- p->gdb_st_rdev = cpu_to_be32(s->st_rdev);
- p->gdb_st_size = cpu_to_be64(s->st_size);
-#ifdef _WIN32
- /* Windows stat is missing some fields. */
- p->gdb_st_blksize = 0;
- p->gdb_st_blocks = 0;
-#else
- p->gdb_st_blksize = cpu_to_be64(s->st_blksize);
- p->gdb_st_blocks = cpu_to_be64(s->st_blocks);
-#endif
- p->gdb_st_atime = cpu_to_be32(s->st_atime);
- p->gdb_st_mtime = cpu_to_be32(s->st_mtime);
- p->gdb_st_ctime = cpu_to_be32(s->st_ctime);
- unlock_user(p, addr, sizeof(struct gdb_stat));
- return true;
-}
-
static void nios2_semi_u32_cb(CPUState *cs, uint64_t ret, int err)
{
Nios2CPU *cpu = NIOS2_CPU(cs);
@@ -147,8 +87,6 @@ static void nios2_semi_u64_cb(CPUState *cs, uint64_t ret, int err)
*/
#define GET_ARG(n) do { \
if (get_user_ual(arg ## n, args + (n) * 4)) { \
- result = -1; \
- errno = EFAULT; \
goto failed; \
} \
} while (0)
@@ -159,10 +97,6 @@ void do_nios2_semihosting(CPUNios2State *env)
int nr;
uint32_t args;
target_ulong arg0, arg1, arg2, arg3;
- void *p;
- void *q;
- uint32_t len;
- uint32_t result;
nr = env->regs[R_ARG0];
args = env->regs[R_ARG1];
@@ -170,234 +104,95 @@ void do_nios2_semihosting(CPUNios2State *env)
case HOSTED_EXIT:
gdb_exit(env->regs[R_ARG0]);
exit(env->regs[R_ARG0]);
+
case HOSTED_OPEN:
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
GET_ARG(3);
- if (use_gdb_syscalls()) {
- gdb_do_syscall(nios2_semi_u32_cb, "open,%s,%x,%x", arg0, (int)arg1,
- arg2, arg3);
- return;
- } else {
- p = lock_user_string(arg0);
- if (!p) {
- result = -1;
- errno = EFAULT;
- } else {
- result = open(p, translate_openflags(arg2), arg3);
- unlock_user(p, arg0, 0);
- }
- }
+ semihost_sys_open(cs, nios2_semi_u32_cb, arg0, arg1, arg2, arg3);
break;
+
case HOSTED_CLOSE:
- {
- /* Ignore attempts to close stdin/out/err. */
- GET_ARG(0);
- int fd = arg0;
- if (fd > 2) {
- if (use_gdb_syscalls()) {
- gdb_do_syscall(nios2_semi_u32_cb, "close,%x", arg0);
- return;
- } else {
- result = close(fd);
- }
- } else {
- result = 0;
- }
- break;
- }
+ GET_ARG(0);
+ semihost_sys_close(cs, nios2_semi_u32_cb, arg0);
+ break;
+
case HOSTED_READ:
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
- len = arg2;
- if (use_gdb_syscalls()) {
- gdb_do_syscall(nios2_semi_u32_cb, "read,%x,%x,%x",
- arg0, arg1, len);
- return;
- } else {
- p = lock_user(VERIFY_WRITE, arg1, len, 0);
- if (!p) {
- result = -1;
- errno = EFAULT;
- } else {
- result = read(arg0, p, len);
- unlock_user(p, arg1, len);
- }
- }
+ semihost_sys_read(cs, nios2_semi_u32_cb, arg0, arg1, arg2);
break;
+
case HOSTED_WRITE:
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
- len = arg2;
- if (use_gdb_syscalls()) {
- gdb_do_syscall(nios2_semi_u32_cb, "write,%x,%x,%x",
- arg0, arg1, len);
- return;
- } else {
- p = lock_user(VERIFY_READ, arg1, len, 1);
- if (!p) {
- result = -1;
- errno = EFAULT;
- } else {
- result = write(arg0, p, len);
- unlock_user(p, arg0, 0);
- }
- }
+ semihost_sys_write(cs, nios2_semi_u32_cb, arg0, arg1, arg2);
break;
+
case HOSTED_LSEEK:
- {
- uint64_t off;
- GET_ARG(0);
- GET_ARG(1);
- GET_ARG(2);
- GET_ARG(3);
- off = (uint32_t)arg2 | ((uint64_t)arg1 << 32);
- if (use_gdb_syscalls()) {
- gdb_do_syscall(nios2_semi_u64_cb, "lseek,%x,%lx,%x",
- arg0, off, arg3);
- } else {
- off = lseek(arg0, off, arg3);
- nios2_semi_u64_cb(cs, off, errno);
- }
- return;
- }
+ GET_ARG(0);
+ GET_ARG(1);
+ GET_ARG(2);
+ GET_ARG(3);
+ semihost_sys_lseek(cs, nios2_semi_u64_cb, arg0,
+ deposit64(arg2, arg1, 32, 32), arg3);
+ break;
+
case HOSTED_RENAME:
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
GET_ARG(3);
- if (use_gdb_syscalls()) {
- gdb_do_syscall(nios2_semi_u32_cb, "rename,%s,%s",
- arg0, (int)arg1, arg2, (int)arg3);
- return;
- } else {
- p = lock_user_string(arg0);
- q = lock_user_string(arg2);
- if (!p || !q) {
- result = -1;
- errno = EFAULT;
- } else {
- result = rename(p, q);
- }
- unlock_user(p, arg0, 0);
- unlock_user(q, arg2, 0);
- }
+ semihost_sys_rename(cs, nios2_semi_u32_cb, arg0, arg1, arg2, arg3);
break;
+
case HOSTED_UNLINK:
GET_ARG(0);
GET_ARG(1);
- if (use_gdb_syscalls()) {
- gdb_do_syscall(nios2_semi_u32_cb, "unlink,%s",
- arg0, (int)arg1);
- return;
- } else {
- p = lock_user_string(arg0);
- if (!p) {
- result = -1;
- errno = EFAULT;
- } else {
- result = unlink(p);
- unlock_user(p, arg0, 0);
- }
- }
+ semihost_sys_remove(cs, nios2_semi_u32_cb, arg0, arg1);
break;
+
case HOSTED_STAT:
GET_ARG(0);
GET_ARG(1);
GET_ARG(2);
- if (use_gdb_syscalls()) {
- gdb_do_syscall(nios2_semi_u32_cb, "stat,%s,%x",
- arg0, (int)arg1, arg2);
- return;
- } else {
- struct stat s;
- p = lock_user_string(arg0);
- if (!p) {
- result = -1;
- errno = EFAULT;
- } else {
- result = stat(p, &s);
- unlock_user(p, arg0, 0);
- }
- if (result == 0 && !translate_stat(env, arg2, &s)) {
- result = -1;
- errno = EFAULT;
- }
- }
+ semihost_sys_stat(cs, nios2_semi_u32_cb, arg0, arg1, arg2);
break;
+
case HOSTED_FSTAT:
GET_ARG(0);
GET_ARG(1);
- if (use_gdb_syscalls()) {
- gdb_do_syscall(nios2_semi_u32_cb, "fstat,%x,%x",
- arg0, arg1);
- return;
- } else {
- struct stat s;
- result = fstat(arg0, &s);
- if (result == 0 && !translate_stat(env, arg1, &s)) {
- result = -1;
- errno = EFAULT;
- }
- }
+ semihost_sys_fstat(cs, nios2_semi_u32_cb, arg0, arg1);
break;
+
case HOSTED_GETTIMEOFDAY:
- /* Only the tv parameter is used. tz is assumed NULL. */
GET_ARG(0);
- if (use_gdb_syscalls()) {
- gdb_do_syscall(nios2_semi_u32_cb, "gettimeofday,%x,%x",
- arg0, 0);
- return;
- } else {
- struct gdb_timeval *p;
- int64_t rt = g_get_real_time();
- p = lock_user(VERIFY_WRITE, arg0, sizeof(struct gdb_timeval), 0);
- if (!p) {
- result = -1;
- errno = EFAULT;
- } else {
- result = 0;
- p->tv_sec = cpu_to_be32(rt / G_USEC_PER_SEC);
- p->tv_usec = cpu_to_be64(rt % G_USEC_PER_SEC);
- unlock_user(p, arg0, sizeof(struct gdb_timeval));
- }
- }
+ GET_ARG(1);
+ semihost_sys_gettimeofday(cs, nios2_semi_u32_cb, arg0, arg1);
break;
+
case HOSTED_ISATTY:
GET_ARG(0);
- if (use_gdb_syscalls()) {
- gdb_do_syscall(nios2_semi_u32_cb, "isatty,%x", arg0);
- return;
- } else {
- result = isatty(arg0);
- }
+ semihost_sys_isatty(cs, nios2_semi_u32_cb, arg0);
break;
+
case HOSTED_SYSTEM:
GET_ARG(0);
GET_ARG(1);
- if (use_gdb_syscalls()) {
- gdb_do_syscall(nios2_semi_u32_cb, "system,%s",
- arg0, (int)arg1);
- return;
- } else {
- p = lock_user_string(arg0);
- if (!p) {
- result = -1;
- errno = EFAULT;
- } else {
- result = system(p);
- unlock_user(p, arg0, 0);
- }
- }
+ semihost_sys_system(cs, nios2_semi_u32_cb, arg0, arg1);
break;
+
default:
qemu_log_mask(LOG_GUEST_ERROR, "nios2-semihosting: unsupported "
"semihosting syscall %d\n", nr);
- result = 0;
+ nios2_semi_u32_cb(cs, -1, ENOSYS);
+ break;
+
+ failed:
+ nios2_semi_u32_cb(cs, -1, EFAULT);
+ break;
}
-failed:
- nios2_semi_u32_cb(cs, result, errno);
}
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH 43/43] target/nios2: Do semihosting call as a normal helper
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (41 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 42/43] target/nios2: Use guestfd.h to implement syscalls Richard Henderson
@ 2022-04-30 13:29 ` Richard Henderson
2022-05-01 7:02 ` [PATCH 00/43] semihosting cleanup Richard Henderson
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-04-30 13:29 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
There's no need to raise an exception; just call
the helper function directly.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/nios2/cpu.h | 3 ---
target/nios2/helper.h | 1 +
target/nios2/helper.c | 7 -------
target/nios2/nios2-semi.c | 3 ++-
target/nios2/translate.c | 2 +-
5 files changed, 4 insertions(+), 12 deletions(-)
diff --git a/target/nios2/cpu.h b/target/nios2/cpu.h
index f85581ee56..75a111a25e 100644
--- a/target/nios2/cpu.h
+++ b/target/nios2/cpu.h
@@ -164,7 +164,6 @@ FIELD(CR_TLBMISC, EE, 24, 1)
/* Exceptions */
#define EXCP_BREAK 0x1000
-#define EXCP_SEMIHOST 0x1001
#define EXCP_RESET 0
#define EXCP_PRESET 1
#define EXCP_IRQ 2
@@ -269,8 +268,6 @@ G_NORETURN void nios2_cpu_do_unaligned_access(CPUState *cpu, vaddr addr,
G_NORETURN void nios2_cpu_loop_exit_advance(CPUNios2State *env,
uintptr_t retaddr);
-void do_nios2_semihosting(CPUNios2State *env);
-
#define CPU_RESOLVING_TYPE TYPE_NIOS2_CPU
#define cpu_gen_code cpu_nios2_gen_code
diff --git a/target/nios2/helper.h b/target/nios2/helper.h
index 1648d76ade..51ec2b35a0 100644
--- a/target/nios2/helper.h
+++ b/target/nios2/helper.h
@@ -29,4 +29,5 @@ DEF_HELPER_3(wrprs, void, env, i32, i32)
DEF_HELPER_2(mmu_write_tlbacc, void, env, i32)
DEF_HELPER_2(mmu_write_tlbmisc, void, env, i32)
DEF_HELPER_2(mmu_write_pteaddr, void, env, i32)
+DEF_HELPER_1(semihosting, void, env)
#endif
diff --git a/target/nios2/helper.c b/target/nios2/helper.c
index bb3b09e5a7..491cbd486f 100644
--- a/target/nios2/helper.c
+++ b/target/nios2/helper.c
@@ -173,9 +173,6 @@ void nios2_cpu_do_interrupt(CPUState *cs)
case EXCP_BREAK:
name = "BREAK insn";
break;
- case EXCP_SEMIHOST:
- name = "SEMIHOST insn";
- break;
}
if (name) {
qemu_log("%s at pc=0x%08x\n", name, env->pc);
@@ -250,10 +247,6 @@ void nios2_cpu_do_interrupt(CPUState *cs)
do_exception(cpu, cpu->exception_addr, 0, true);
break;
- case EXCP_SEMIHOST:
- do_nios2_semihosting(env);
- break;
-
default:
cpu_abort(cs, "unhandled exception type=%d\n", cs->exception_index);
}
diff --git a/target/nios2/nios2-semi.c b/target/nios2/nios2-semi.c
index 3dad72d1f6..9648030d37 100644
--- a/target/nios2/nios2-semi.c
+++ b/target/nios2/nios2-semi.c
@@ -32,6 +32,7 @@
#include "semihosting/softmmu-uaccess.h"
#endif
#include "qemu/log.h"
+#include "exec/helper-proto.h"
#define HOSTED_EXIT 0
#define HOSTED_INIT_SIM 1
@@ -91,7 +92,7 @@ static void nios2_semi_u64_cb(CPUState *cs, uint64_t ret, int err)
} \
} while (0)
-void do_nios2_semihosting(CPUNios2State *env)
+void HELPER(semihosting)(CPUNios2State *env)
{
CPUState *cs = env_cpu(env);
int nr;
diff --git a/target/nios2/translate.c b/target/nios2/translate.c
index 3a037a68cc..f245fd7d0a 100644
--- a/target/nios2/translate.c
+++ b/target/nios2/translate.c
@@ -819,7 +819,7 @@ static void gen_break(DisasContext *dc, uint32_t code, uint32_t flags)
/* The semihosting instruction is "break 1". */
R_TYPE(instr, code);
if (semihosting_enabled() && instr.imm5 == 1) {
- t_gen_helper_raise_exception(dc, EXCP_SEMIHOST);
+ gen_helper_semihosting(cpu_env);
return;
}
#endif
--
2.34.1
^ permalink raw reply related [flat|nested] 45+ messages in thread
* Re: [PATCH 00/43] semihosting cleanup
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
` (42 preceding siblings ...)
2022-04-30 13:29 ` [PATCH 43/43] target/nios2: Do semihosting call as a normal helper Richard Henderson
@ 2022-05-01 7:02 ` Richard Henderson
43 siblings, 0 replies; 45+ messages in thread
From: Richard Henderson @ 2022-05-01 7:02 UTC (permalink / raw)
To: qemu-devel; +Cc: crwulff, alex.bennee, f4bug, laurent
On 4/30/22 06:28, Richard Henderson wrote:
> target/m68k: Do semihosting call as a normal helper
> target/nios2: Do semihosting call as a normal helper
There's a reason not to do this: locking of the iothread mutex, and being back in the main
loop, where the vm will be stopped while we may wait for a reply from gdb.
r~
^ permalink raw reply [flat|nested] 45+ messages in thread
end of thread, other threads:[~2022-05-01 7:23 UTC | newest]
Thread overview: 45+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2022-04-30 13:28 [PATCH 00/43] semihosting cleanup Richard Henderson
2022-04-30 13:28 ` [PATCH 01/43] semihosting: Move exec/softmmu-semi.h to semihosting/softmmu-uaccess.h Richard Henderson
2022-04-30 13:28 ` [PATCH 02/43] semihosting: Return failure from softmmu-uaccess.h functions Richard Henderson
2022-04-30 13:28 ` [PATCH 03/43] semihosting: Improve condition for config.c and console.c Richard Henderson
2022-04-30 13:28 ` [PATCH 04/43] semihosting: Move softmmu-uaccess functions out of line Richard Henderson
2022-04-30 13:28 ` [PATCH 05/43] semihosting: Add target_strlen for softmmu-uaccess.h Richard Henderson
2022-04-30 13:28 ` [PATCH 06/43] semihosting: Simplify softmmu_lock_user_string Richard Henderson
2022-04-30 13:28 ` [PATCH 07/43] semihosting: Split out guestfd.c Richard Henderson
2022-04-30 13:28 ` [PATCH 08/43] semihosting: Generalize GuestFDFeatureFile Richard Henderson
2022-04-30 13:28 ` [PATCH 09/43] semihosting: Return void from do_common_semihosting Richard Henderson
2022-04-30 13:28 ` [PATCH 10/43] semihosting: Adjust error checking in common_semi_cb Richard Henderson
2022-04-30 13:29 ` [PATCH 11/43] semihosting: Move common-semi.h to include/semihosting/ Richard Henderson
2022-04-30 13:29 ` [PATCH 12/43] include/exec: Move gdb open flags to gdbstub.h Richard Henderson
2022-04-30 13:29 ` [PATCH 13/43] include/exec: Move gdb_stat and gdb_timeval " Richard Henderson
2022-04-30 13:29 ` [PATCH 14/43] semihosting: Use struct gdb_stat in common_semi_flen_cb Richard Henderson
2022-04-30 13:29 ` [PATCH 15/43] semihosting: Split is_64bit_semihosting per target Richard Henderson
2022-04-30 13:29 ` [PATCH 16/43] semihosting: Split common_semi_flen_buf " Richard Henderson
2022-04-30 13:29 ` [PATCH 17/43] semihosting: Split out common_semi_has_synccache Richard Henderson
2022-04-30 13:29 ` [PATCH 18/43] semihosting: Use env more often in do_common_semihosting Richard Henderson
2022-04-30 13:29 ` [PATCH 19/43] semihosting: Move GET_ARG/SET_ARG earlier in the file Richard Henderson
2022-04-30 13:29 ` [PATCH 20/43] semihosting: Split out semihost_sys_open Richard Henderson
2022-04-30 13:29 ` [PATCH 21/43] semihosting: Split out semihost_sys_close Richard Henderson
2022-04-30 13:29 ` [PATCH 22/43] semihosting: Split out semihost_sys_read Richard Henderson
2022-04-30 13:29 ` [PATCH 23/43] semihosting: Split out semihost_sys_write Richard Henderson
2022-04-30 13:29 ` [PATCH 24/43] semihosting: Bound length for semihost_sys_{read, write} Richard Henderson
2022-04-30 13:29 ` [PATCH 25/43] semihosting: Split out semihost_sys_lseek Richard Henderson
2022-04-30 13:29 ` [PATCH 26/43] semihosting: Split out semihost_sys_isatty Richard Henderson
2022-04-30 13:29 ` [PATCH 27/43] semihosting: Split out semihost_sys_flen Richard Henderson
2022-04-30 13:29 ` [PATCH 28/43] semihosting: Split out semihost_sys_remove Richard Henderson
2022-04-30 13:29 ` [PATCH 29/43] semihosting: Split out semihost_sys_rename Richard Henderson
2022-04-30 13:29 ` [PATCH 30/43] semihosting: Split out semihost_sys_system Richard Henderson
2022-04-30 13:29 ` [PATCH 31/43] semihosting: Create semihost_sys_{stat,fstat} Richard Henderson
2022-04-30 13:29 ` [PATCH 32/43] semihosting: Create semihost_sys_gettimeofday Richard Henderson
2022-04-30 13:29 ` [PATCH 33/43] gdbstub: Widen gdb_syscall_complete_cb return value Richard Henderson
2022-04-30 13:29 ` [PATCH 34/43] target/m68k: Eliminate m68k_semi_is_fseek Richard Henderson
2022-04-30 13:29 ` [PATCH 35/43] target/m68k: Make semihosting system only Richard Henderson
2022-04-30 13:29 ` [PATCH 36/43] target/m68k: Use guestfd.h to implement syscalls Richard Henderson
2022-04-30 13:29 ` [PATCH 37/43] target/m68k: Do semihosting call as a normal helper Richard Henderson
2022-04-30 13:29 ` [PATCH 38/43] target/m68k: Enable semihosting for non-coldfire Richard Henderson
2022-04-30 13:29 ` [PATCH 39/43] target/m68k: Remove EXCP_HALT_INSN Richard Henderson
2022-04-30 13:29 ` [PATCH 40/43] target/nios2: Eliminate nios2_semi_is_lseek Richard Henderson
2022-04-30 13:29 ` [PATCH 41/43] target/nios2: Move nios2-semi.c to nios2_softmmu_ss Richard Henderson
2022-04-30 13:29 ` [PATCH 42/43] target/nios2: Use guestfd.h to implement syscalls Richard Henderson
2022-04-30 13:29 ` [PATCH 43/43] target/nios2: Do semihosting call as a normal helper Richard Henderson
2022-05-01 7:02 ` [PATCH 00/43] semihosting cleanup Richard Henderson
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).