From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: Max Filippov <jcmvbkbc@gmail.com>,
alex.bennee@linaro.org, laurent@vivier.eu
Subject: [PATCH v2 36/36] linux-user/xtensa: Implement setup_sigtramp
Date: Tue, 6 Jul 2021 16:49:32 -0700 [thread overview]
Message-ID: <20210706234932.356913-37-richard.henderson@linaro.org> (raw)
In-Reply-To: <20210706234932.356913-1-richard.henderson@linaro.org>
Create and record the rt signal trampoline.
Use it when the guest does not use SA_RESTORER.
Reviewed-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
linux-user/xtensa/target_signal.h | 2 ++
linux-user/xtensa/signal.c | 50 ++++++++++++++++++-------------
2 files changed, 32 insertions(+), 20 deletions(-)
diff --git a/linux-user/xtensa/target_signal.h b/linux-user/xtensa/target_signal.h
index c60bf656f6..1c7ee73154 100644
--- a/linux-user/xtensa/target_signal.h
+++ b/linux-user/xtensa/target_signal.h
@@ -20,4 +20,6 @@ typedef struct target_sigaltstack {
#include "../generic/signal.h"
+#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 1
+
#endif
diff --git a/linux-user/xtensa/signal.c b/linux-user/xtensa/signal.c
index 72771e1294..fd57481bf5 100644
--- a/linux-user/xtensa/signal.c
+++ b/linux-user/xtensa/signal.c
@@ -163,26 +163,7 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
if (ka->sa_flags & TARGET_SA_RESTORER) {
ra = ka->sa_restorer;
} else {
- ra = frame_addr + offsetof(struct target_rt_sigframe, retcode);
-#ifdef TARGET_WORDS_BIGENDIAN
- /* Generate instruction: MOVI a2, __NR_rt_sigreturn */
- __put_user(0x22, &frame->retcode[0]);
- __put_user(0x0a, &frame->retcode[1]);
- __put_user(TARGET_NR_rt_sigreturn, &frame->retcode[2]);
- /* Generate instruction: SYSCALL */
- __put_user(0x00, &frame->retcode[3]);
- __put_user(0x05, &frame->retcode[4]);
- __put_user(0x00, &frame->retcode[5]);
-#else
- /* Generate instruction: MOVI a2, __NR_rt_sigreturn */
- __put_user(0x22, &frame->retcode[0]);
- __put_user(0xa0, &frame->retcode[1]);
- __put_user(TARGET_NR_rt_sigreturn, &frame->retcode[2]);
- /* Generate instruction: SYSCALL */
- __put_user(0x00, &frame->retcode[3]);
- __put_user(0x50, &frame->retcode[4]);
- __put_user(0x00, &frame->retcode[5]);
-#endif
+ ra = default_rt_sigreturn;
}
memset(env->regs, 0, sizeof(env->regs));
env->pc = ka->_sa_handler;
@@ -263,3 +244,32 @@ badframe:
force_sig(TARGET_SIGSEGV);
return -TARGET_QEMU_ESIGRETURN;
}
+
+void setup_sigtramp(abi_ulong sigtramp_page)
+{
+ uint8_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 6, 0);
+ assert(tramp != NULL);
+
+#ifdef TARGET_WORDS_BIGENDIAN
+ /* Generate instruction: MOVI a2, __NR_rt_sigreturn */
+ __put_user(0x22, &tramp[0]);
+ __put_user(0x0a, &tramp[1]);
+ __put_user(TARGET_NR_rt_sigreturn, &tramp[2]);
+ /* Generate instruction: SYSCALL */
+ __put_user(0x00, &tramp[3]);
+ __put_user(0x05, &tramp[4]);
+ __put_user(0x00, &tramp[5]);
+#else
+ /* Generate instruction: MOVI a2, __NR_rt_sigreturn */
+ __put_user(0x22, &tramp[0]);
+ __put_user(0xa0, &tramp[1]);
+ __put_user(TARGET_NR_rt_sigreturn, &tramp[2]);
+ /* Generate instruction: SYSCALL */
+ __put_user(0x00, &tramp[3]);
+ __put_user(0x50, &tramp[4]);
+ __put_user(0x00, &tramp[5]);
+#endif
+
+ default_rt_sigreturn = sigtramp_page;
+ unlock_user(tramp, sigtramp_page, 6);
+}
--
2.25.1
next prev parent reply other threads:[~2021-07-07 0:15 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-06 23:48 [PATCH v2 00/36] linux-user: Signal trampolines and vdsos Richard Henderson
2021-07-06 23:48 ` [PATCH v2 01/36] linux-user: Add infrastructure for a signal trampoline page Richard Henderson
2021-07-06 23:48 ` [PATCH v2 02/36] linux-user: Fix style problems in linuxload.c Richard Henderson
2021-07-07 19:22 ` Laurent Vivier
2021-07-06 23:48 ` [PATCH v2 03/36] linux-user: Introduce imgsrc_read, imgsrc_read_alloc Richard Henderson
2021-07-06 23:49 ` [PATCH v2 04/36] linux-user: Tidy loader_exec Richard Henderson
2021-07-07 8:21 ` Philippe Mathieu-Daudé
2021-07-06 23:49 ` [PATCH v2 05/36] linux-user: Do not clobber bprm_buf swapping ehdr Richard Henderson
2021-07-06 23:49 ` [PATCH v2 06/36] linux-user: Use ImageSource in load_elf_image Richard Henderson
2021-07-06 23:49 ` [PATCH v2 07/36] linux-user: Use ImageSource in load_symbols Richard Henderson
2021-07-06 23:49 ` [PATCH v2 08/36] linux-user: Replace bprm->fd with bprm->src.fd Richard Henderson
2021-07-06 23:49 ` [PATCH v2 09/36] linux-user: Introduce imgsrc_mmap Richard Henderson
2021-07-06 23:49 ` [PATCH v2 10/36] linux-user: Load vdso image if available Richard Henderson
2021-07-06 23:49 ` [PATCH v2 11/36] linux-user: Add gen-vdso tool Richard Henderson
2021-07-06 23:49 ` [PATCH v2 12/36] linux-user/aarch64: Add vdso and use it for rt_sigreturn Richard Henderson
2021-07-06 23:49 ` [PATCH v2 13/36] linux-user/arm: Drop v1 signal frames Richard Henderson
2021-07-07 8:19 ` Philippe Mathieu-Daudé
2021-07-07 17:35 ` Peter Maydell
2021-07-06 23:49 ` [PATCH v2 14/36] linux-user/arm: Drop "_v2" from symbols in signal.c Richard Henderson
2021-07-07 8:19 ` Philippe Mathieu-Daudé
2021-07-06 23:49 ` [PATCH v2 15/36] target/arm: Add isar_feature_aa32_a32 Richard Henderson
2021-07-06 23:49 ` [PATCH v2 16/36] linux-user/arm: Add vdso and use it for rt_sigreturn Richard Henderson
2021-07-06 23:49 ` [PATCH v2 17/36] linux-user/alpha: Implement setup_sigtramp Richard Henderson
2021-07-06 23:49 ` [PATCH v2 18/36] linux-user/cris: " Richard Henderson
2021-07-06 23:49 ` [PATCH v2 19/36] linux-user/hexagon: " Richard Henderson
2021-07-12 23:08 ` Taylor Simpson
2021-07-06 23:49 ` [PATCH v2 20/36] linux-user/hppa: Add vdso and use it for rt_sigreturn Richard Henderson
2021-07-06 23:49 ` [PATCH v2 21/36] linux-user/x86_64: Raise SIGSEGV if SA_RESTORER not set Richard Henderson
2021-07-06 23:49 ` [PATCH v2 22/36] linux-user/i386: Add vdso and use it for sigreturn Richard Henderson
2021-07-07 20:28 ` Richard Henderson
2021-07-06 23:49 ` [PATCH v2 23/36] linux-user/x86_64: Add vdso Richard Henderson
2021-07-06 23:49 ` [PATCH v2 24/36] linux-user/m68k: Implement setup_sigtramp Richard Henderson
2021-07-06 23:49 ` [PATCH v2 25/36] linux-user/microblaze: " Richard Henderson
2021-07-06 23:49 ` [PATCH v2 26/36] linux-user/mips: Tidy install_sigtramp Richard Henderson
2021-07-06 23:49 ` [PATCH v2 27/36] linux-user/mips: Implement setup_sigtramp Richard Henderson
2021-07-06 23:49 ` [PATCH v2 28/36] linux-user/nios2: Document non-use of setup_sigtramp Richard Henderson
2021-07-06 23:49 ` [PATCH v2 29/36] linux-user/openrisc: Implement setup_sigtramp Richard Henderson
2021-07-06 23:49 ` [PATCH v2 30/36] target/ppc: Simplify encode_trampoline Richard Henderson
2021-07-06 23:49 ` [PATCH v2 31/36] linux-user/ppc: Implement setup_sigtramp Richard Henderson
2021-07-06 23:49 ` [PATCH v2 32/36] linux-user/riscv: Add vdso and use it for sigreturn Richard Henderson
2021-07-06 23:49 ` [PATCH v2 33/36] linux-user/s390x: Implement setup_sigtramp Richard Henderson
2021-07-06 23:49 ` [PATCH v2 34/36] linux-user/sh4: " Richard Henderson
2021-07-06 23:49 ` [PATCH v2 35/36] linux-user/sparc: " Richard Henderson
2021-07-06 23:49 ` Richard Henderson [this message]
2021-07-08 10:55 ` [PATCH v2 00/36] linux-user: Signal trampolines and vdsos Philippe Mathieu-Daudé
2021-09-01 9:36 ` Peter Maydell
2021-09-03 13:39 ` Alex Bennée
2021-09-03 15:39 ` Richard Henderson
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