* [Qemu-devel] [patch] Arm semihosting support.
@ 2005-04-17 20:47 Paul Brook
0 siblings, 0 replies; only message in thread
From: Paul Brook @ 2005-04-17 20:47 UTC (permalink / raw)
To: qemu-devel
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The attached patch adds support for ARM "Angel" semihosting syscalls.
This is a simple syscall layer which provides basic OS services to embedded
applications. It is implemented by several free and proprietary toolchains/
debugging tools, including newlib and the GDB simulator. It's what you get if
you configure for "arm-elf".
Paul
[-- Attachment #2: patch.qemu_angel --]
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Index: Makefile.target
===================================================================
RCS file: /cvsroot/qemu/qemu/Makefile.target,v
retrieving revision 1.64
diff -u -p -r1.64 Makefile.target
--- Makefile.target 17 Apr 2005 19:16:13 -0000 1.64
+++ Makefile.target 17 Apr 2005 20:41:12 -0000
@@ -233,7 +233,7 @@ endif
ifeq ($(TARGET_ARCH), arm)
OBJS+=nwfpe/fpa11.o nwfpe/fpa11_cpdo.o \
nwfpe/fpa11_cpdt.o nwfpe/fpa11_cprt.o nwfpe/fpopcode.o nwfpe/single_cpdo.o \
- nwfpe/double_cpdo.o nwfpe/extended_cpdo.o
+ nwfpe/double_cpdo.o nwfpe/extended_cpdo.o arm-semi.o
endif
SRCS:= $(OBJS:.o=.c)
OBJS+= libqemu.a
Index: linux-user/arm-semi.c
===================================================================
RCS file: linux-user/arm-semi.c
diff -N linux-user/arm-semi.c
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ linux-user/arm-semi.c 17 Apr 2005 20:41:13 -0000
@@ -0,0 +1,194 @@
+/*
+ * Arm "Angel" semihosting syscalls
+ *
+ * Copyright (c) 2005 CodeSourcery, LLC. Written by Paul Brook.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+
+#include "qemu.h"
+
+#define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024)
+
+#define SYS_OPEN 0x01
+#define SYS_CLOSE 0x02
+#define SYS_WRITEC 0x03
+#define SYS_WRITE0 0x04
+#define SYS_WRITE 0x05
+#define SYS_READ 0x06
+#define SYS_READC 0x07
+#define SYS_ISTTY 0x09
+#define SYS_SEEK 0x0a
+#define SYS_FLEN 0x0c
+#define SYS_TMPNAM 0x0d
+#define SYS_REMOVE 0x0e
+#define SYS_RENAME 0x0f
+#define SYS_CLOCK 0x10
+#define SYS_TIME 0x11
+#define SYS_SYSTEM 0x12
+#define SYS_ERRNO 0x13
+#define SYS_GET_CMDLINE 0x15
+#define SYS_HEAPINFO 0x16
+#define SYS_EXIT 0x18
+
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
+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
+};
+
+static inline uint32_t set_swi_errno(TaskState *ts, uint32_t code)
+{
+ if (code == (uint32_t)-1)
+ ts->swi_errno = errno;
+ return code;
+}
+
+#define ARG(x) tswap32(args[x])
+uint32_t do_arm_semihosting(CPUState *env)
+{
+ uint32_t *args;
+ char * s;
+ int nr;
+ uint32_t ret;
+ TaskState *ts = env->opaque;
+
+ nr = env->regs[0];
+ args = (uint32_t *)env->regs[1];
+ switch (nr) {
+ case SYS_OPEN:
+ s = (char *)ARG(0);
+ if (ARG(1) >= 12)
+ return (uint32_t)-1;
+ if (strcmp(s, ":tt") == 0) {
+ if (ARG(1) < 4)
+ return STDIN_FILENO;
+ else
+ return STDOUT_FILENO;
+ }
+ return set_swi_errno(ts, open(s, open_modeflags[ARG(1)]));
+ case SYS_CLOSE:
+ return set_swi_errno(ts, close(ARG(0)));
+ case SYS_WRITEC:
+ /* Write to debug console. stderr is near enough. */
+ return write(STDERR_FILENO, args, 1);
+ case SYS_WRITE0:
+ s = (char *)args;
+ return write(STDERR_FILENO, s, strlen(s));
+ case SYS_WRITE:
+ ret = set_swi_errno(ts, write(ARG(0), (void *)ARG(1), ARG(2)));
+ if (ret == (uint32_t)-1)
+ return -1;
+ return ARG(2) - ret;
+ case SYS_READ:
+ ret = set_swi_errno(ts, read(ARG(0), (void *)ARG(1), ARG(2)));
+ if (ret == (uint32_t)-1)
+ return -1;
+ return ARG(2) - ret;
+ case SYS_READC:
+ /* XXX: Read from debug cosole. Not implemented. */
+ return 0;
+ case SYS_ISTTY:
+ return isatty(ARG(0));
+ case SYS_SEEK:
+ return set_swi_errno(ts, lseek(ARG(0), ARG(1), SEEK_SET));
+ case SYS_FLEN:
+ {
+ struct stat buf;
+ ret = set_swi_errno(ts, fstat(ARG(0), &buf));
+ if (ret == (uint32_t)-1)
+ return -1;
+ return buf.st_size;
+ }
+ case SYS_TMPNAM:
+ /* XXX: Not implemented. */
+ return -1;
+ case SYS_REMOVE:
+ return set_swi_errno(ts, remove((char *)ARG(0)));
+ case SYS_RENAME:
+ return set_swi_errno(ts, rename((char *)ARG(0), (char *)ARG(2)));
+ case SYS_CLOCK:
+ return clock() / (CLOCKS_PER_SEC / 100);
+ case SYS_TIME:
+ return set_swi_errno(ts, time(NULL));
+ case SYS_SYSTEM:
+ return set_swi_errno(ts, system((char *)ARG(0)));
+ case SYS_ERRNO:
+ return ts->swi_errno;
+ case SYS_GET_CMDLINE:
+ /* XXX: Not implemented. */
+ s = (char *)ARG(0);
+ *s = 0;
+ args[1] = tswap32(0);
+ return -1;
+ case SYS_HEAPINFO:
+ {
+ uint32_t *ptr;
+ uint32_t limit;
+
+ /* Some C llibraries assume the heap immediately follows .bss, so
+ allocate it using sbrk. */
+ if (!ts->heap_limit) {
+ long ret;
+
+ ts->heap_base = do_brk(NULL);
+ limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE;
+ /* Try a big heap, and reduce the size if that fails. */
+ for (;;) {
+ ret = do_brk((char *)limit);
+ if (ret != -1)
+ break;
+ limit = (ts->heap_base >> 1) + (limit >> 1);
+ }
+ ts->heap_limit = limit;
+ }
+
+ ptr = (uint32_t *)tswap32(ARG(0));
+ ptr[0] = tswap32(ts->heap_base);
+ ptr[1] = tswap32(ts->heap_limit);
+ ptr[2] = tswap32(ts->stack_base);
+ ptr[3] = tswap32(0); /* Stack limit. */
+ return 0;
+ }
+ case SYS_EXIT:
+ exit(0);
+ default:
+ fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
+ cpu_dump_state(env, stderr, fprintf, 0);
+ abort();
+ }
+}
+
Index: linux-user/main.c
===================================================================
RCS file: /cvsroot/qemu/qemu/linux-user/main.c,v
retrieving revision 1.63
diff -u -p -r1.63 main.c
--- linux-user/main.c 17 Apr 2005 19:16:13 -0000 1.63
+++ linux-user/main.c 17 Apr 2005 20:41:13 -0000
@@ -363,6 +363,9 @@ void cpu_loop(CPUARMState *env)
n = insn & 0xffffff;
if (n == ARM_NR_cacheflush) {
arm_cache_flush(env->regs[0], env->regs[1]);
+ } else if (n == ARM_NR_semihosting
+ || n == ARM_NR_thumb_semihosting) {
+ env->regs[0] = do_arm_semihosting (env);
} else if (n >= ARM_SYSCALL_BASE) {
/* linux syscall */
n -= ARM_SYSCALL_BASE;
@@ -1207,6 +1210,10 @@ int main(int argc, char **argv)
env->regs[i] = regs->uregs[i];
}
env->cpsr = regs->uregs[16];
+ ts->stack_base = info->start_stack;
+ ts->heap_base = info->brk;
+ /* This will be filled in on the first SYS_HEAPINFO call. */
+ ts->heap_limit = 0;
}
#elif defined(TARGET_SPARC)
{
Index: linux-user/qemu.h
===================================================================
RCS file: /cvsroot/qemu/qemu/linux-user/qemu.h,v
retrieving revision 1.23
diff -u -p -r1.23 qemu.h
--- linux-user/qemu.h 17 Apr 2005 19:16:13 -0000 1.23
+++ linux-user/qemu.h 17 Apr 2005 20:41:13 -0000
@@ -62,6 +62,11 @@ typedef struct TaskState {
#ifdef TARGET_ARM
/* FPA state */
FPA11 fpa;
+ /* Extra fields for semihosted binaries. */
+ uint32_t stack_base;
+ uint32_t heap_base;
+ uint32_t heap_limit;
+ int swi_errno;
#endif
#ifdef TARGET_I386
struct target_vm86plus_struct *target_v86;
@@ -80,6 +85,7 @@ int elf_exec(const char * filename, char
struct target_pt_regs * regs, struct image_info *infop);
void target_set_brk(char *new_brk);
+long do_brk(char *new_brk);
void syscall_init(void);
long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3,
long arg4, long arg5, long arg6);
Index: linux-user/syscall.c
===================================================================
RCS file: /cvsroot/qemu/qemu/linux-user/syscall.c,v
retrieving revision 1.58
diff -u -p -r1.58 syscall.c
--- linux-user/syscall.c 1 Mar 2005 22:32:06 -0000 1.58
+++ linux-user/syscall.c 17 Apr 2005 20:41:14 -0000
@@ -264,7 +264,7 @@ void target_set_brk(char *new_brk)
target_original_brk = new_brk;
}
-static long do_brk(char *new_brk)
+long do_brk(char *new_brk)
{
char *brk_page;
long mapped_addr;
Index: linux-user/arm/syscall.h
===================================================================
RCS file: /cvsroot/qemu/qemu/linux-user/arm/syscall.h,v
retrieving revision 1.4
diff -u -p -r1.4 syscall.h
--- linux-user/arm/syscall.h 31 Jan 2005 20:45:13 -0000 1.4
+++ linux-user/arm/syscall.h 17 Apr 2005 20:41:14 -0000
@@ -29,8 +29,13 @@ struct target_pt_regs {
#define ARM_NR_cacheflush (ARM_SYSCALL_BASE + 0xf0000 + 2)
+#define ARM_NR_semihosting 0x123456
+#define ARM_NR_thumb_semihosting 0xAB
+
#if defined(TARGET_WORDS_BIGENDIAN)
#define UNAME_MACHINE "armv5teb"
#else
#define UNAME_MACHINE "armv5tel"
#endif
+
+uint32_t do_arm_semihosting(CPUState *);
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2005-04-17 20:47 [Qemu-devel] [patch] Arm semihosting support Paul Brook
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