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| author | Richard Henderson <richard.henderson@linaro.org> | 2021-09-29 09:05:34 -0400 |
|---|---|---|
| committer | Laurent Vivier <laurent@vivier.eu> | 2021-10-01 12:03:48 +0200 |
| commit | e281c2bafe22135c47caf7e1fa9db19647e49c3d (patch) | |
| tree | 2f9e06c3a666e5c5df79cf14d8a9c185421fe887 /linux-user | |
| parent | dd55f1c8b217e14293f42d8531371b7c626c61dd (diff) | |
| download | qemu-e281c2bafe22135c47caf7e1fa9db19647e49c3d.zip qemu-e281c2bafe22135c47caf7e1fa9db19647e49c3d.tar.gz qemu-e281c2bafe22135c47caf7e1fa9db19647e49c3d.tar.bz2 | |
linux-user/cris: Implement setup_sigtramp
Split out setup_sigreturn so that we can continue to
initialize the words on the stack, as documented.
However, use the off-stack trampoline.
Cc: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210929130553.121567-8-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Diffstat (limited to 'linux-user')
| -rw-r--r-- | linux-user/cris/signal.c | 29 | ||||
| -rw-r--r-- | linux-user/cris/target_signal.h | 2 |
2 files changed, 23 insertions, 8 deletions
diff --git a/linux-user/cris/signal.c b/linux-user/cris/signal.c index 2c39bdf..7f6aca9 100644 --- a/linux-user/cris/signal.c +++ b/linux-user/cris/signal.c @@ -97,6 +97,14 @@ static abi_ulong get_sigframe(CPUCRISState *env, int framesize) return sp - framesize; } +static void setup_sigreturn(uint16_t *retcode) +{ + /* This is movu.w __NR_sigreturn, r9; break 13; */ + __put_user(0x9c5f, retcode + 0); + __put_user(TARGET_NR_sigreturn, retcode + 1); + __put_user(0xe93d, retcode + 2); +} + void setup_frame(int sig, struct target_sigaction *ka, target_sigset_t *set, CPUCRISState *env) { @@ -112,14 +120,8 @@ void setup_frame(int sig, struct target_sigaction *ka, /* * The CRIS signal return trampoline. A real linux/CRIS kernel doesn't * use this trampoline anymore but it sets it up for GDB. - * In QEMU, using the trampoline simplifies things a bit so we use it. - * - * This is movu.w __NR_sigreturn, r9; break 13; */ - __put_user(0x9c5f, frame->retcode+0); - __put_user(TARGET_NR_sigreturn, - frame->retcode + 1); - __put_user(0xe93d, frame->retcode + 2); + setup_sigreturn(frame->retcode); /* Save the mask. */ __put_user(set->sig[0], &frame->sc.oldmask); @@ -135,7 +137,7 @@ void setup_frame(int sig, struct target_sigaction *ka, env->regs[10] = sig; env->pc = (unsigned long) ka->_sa_handler; /* Link SRP so the guest returns through the trampoline. */ - env->pregs[PR_SRP] = frame_addr + offsetof(typeof(*frame), retcode); + env->pregs[PR_SRP] = default_sigreturn; unlock_user_struct(frame, frame_addr, 1); return; @@ -187,3 +189,14 @@ long do_rt_sigreturn(CPUCRISState *env) qemu_log_mask(LOG_UNIMP, "do_rt_sigreturn: not implemented\n"); return -TARGET_ENOSYS; } + +void setup_sigtramp(abi_ulong sigtramp_page) +{ + uint16_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 6, 0); + assert(tramp != NULL); + + default_sigreturn = sigtramp_page; + setup_sigreturn(tramp); + + unlock_user(tramp, sigtramp_page, 6); +} diff --git a/linux-user/cris/target_signal.h b/linux-user/cris/target_signal.h index 495a142..83a5155 100644 --- a/linux-user/cris/target_signal.h +++ b/linux-user/cris/target_signal.h @@ -22,4 +22,6 @@ typedef struct target_sigaltstack { #include "../generic/signal.h" #define TARGET_ARCH_HAS_SETUP_FRAME +#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 1 + #endif /* CRIS_TARGET_SIGNAL_H */ |