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linux-user/microblaze: Implement setup_sigtramp

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Create and record the rt signal 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: <20210929130553.121567-14-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Richard Henderson 2021-09-29 09:05:40 -04:00 committed by Laurent Vivier
parent 5125aced7c
commit 8004316d81
2 changed files with 19 additions and 7 deletions
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24
linux-user/microblaze/signal.c
View File

@ -161,17 +161,11 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
/* Kernel does not use SA_RESTORER. */
/* addi r12, r0, __NR_sigreturn */
__put_user(0x31800000U | TARGET_NR_rt_sigreturn, frame->tramp + 0);
/* brki r14, 0x8 */
__put_user(0xb9cc0008U, frame->tramp + 1);
/*
* Return from sighandler will jump to the tramp.
* Negative 8 offset because return is rtsd r15, 8
*/
env->regs[15] =
frame_addr + offsetof(struct target_rt_sigframe, tramp) - 8;
env->regs[15] = default_rt_sigreturn - 8;
/* Set up registers for signal handler */
env->regs[1] = frame_addr;
@ -220,3 +214,19 @@ long do_rt_sigreturn(CPUMBState *env)
force_sig(TARGET_SIGSEGV);
return -TARGET_QEMU_ESIGRETURN;
}
void setup_sigtramp(abi_ulong sigtramp_page)
{
uint32_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 8, 0);
assert(tramp != NULL);
/*
* addi r12, r0, __NR_rt_sigreturn
* brki r14, 0x8
*/
__put_user(0x31800000U | TARGET_NR_rt_sigreturn, tramp);
__put_user(0xb9cc0008U, tramp + 1);
default_rt_sigreturn = sigtramp_page;
unlock_user(tramp, sigtramp_page, 8);
}

2
linux-user/microblaze/target_signal.h
View File

@ -21,4 +21,6 @@ typedef struct target_sigaltstack {
#include "../generic/signal.h"
#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 1
#endif /* MICROBLAZE_TARGET_SIGNAL_H */