diff options
| author | Richard Henderson <richard.henderson@linaro.org> | 2021-09-29 09:05:51 -0400 |
|---|---|---|
| committer | Laurent Vivier <laurent@vivier.eu> | 2021-10-01 12:03:48 +0200 |
| commit | 55e83c200594b5c3ab412dec2646898571b08b40 (patch) | |
| tree | 6035e3a2b437099e7b0ddb7ea6ae3b2a8f6eb5bf /linux-user | |
| parent | 3f7685eaf90b36d0dc39d4719840e736c019a05c (diff) | |
linux-user/xtensa: Implement setup_sigtramp
Create and record the rt signal trampoline.
Use it when the guest does not use SA_RESTORER.
Reviewed-by: Max Filippov <jcmvbkbc@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210929130553.121567-25-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Diffstat (limited to 'linux-user')
| -rw-r--r-- | linux-user/xtensa/signal.c | 56 | ||||
| -rw-r--r-- | linux-user/xtensa/target_signal.h | 2 |
2 files changed, 38 insertions, 20 deletions
diff --git a/linux-user/xtensa/signal.c b/linux-user/xtensa/signal.c index 7a3bfb92ca..81572a5fc7 100644 --- a/linux-user/xtensa/signal.c +++ b/linux-user/xtensa/signal.c @@ -128,6 +128,29 @@ static int setup_sigcontext(struct target_rt_sigframe *frame, return 1; } +static void install_sigtramp(uint8_t *tramp) +{ +#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 +} + void setup_rt_frame(int sig, struct target_sigaction *ka, target_siginfo_t *info, target_sigset_t *set, CPUXtensaState *env) @@ -164,26 +187,9 @@ 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 + /* Not used, but retain for ABI compatibility. */ + install_sigtramp(frame->retcode); + ra = default_rt_sigreturn; } memset(env->regs, 0, sizeof(env->regs)); env->pc = ka->_sa_handler; @@ -264,3 +270,13 @@ 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); + + default_rt_sigreturn = sigtramp_page; + install_sigtramp(tramp); + unlock_user(tramp, sigtramp_page, 6); +} 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 |