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linux-user/cris: Implement setup_sigtramp

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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>
This commit is contained in:
Richard Henderson 2021-09-29 09:05:34 -04:00 committed by Laurent Vivier
parent dd55f1c8b2
commit e281c2bafe
2 changed files with 23 additions and 8 deletions
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29
linux-user/cris/signal.c
View file

@ -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);
}

2
linux-user/cris/target_signal.h
View file

@ -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 */