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linux-user/mips: Implement setup_sigtramp

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Create and record the two signal trampolines.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210929130553.121567-16-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Richard Henderson 2021-09-29 09:05:42 -04:00 committed by Laurent Vivier
parent 4f7a0a4c86
commit 317a33b6eb
3 changed files with 27 additions and 10 deletions
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34
linux-user/mips/signal.c
View File

@ -209,8 +209,6 @@ void setup_frame(int sig, struct target_sigaction * ka,
goto give_sigsegv;
}
install_sigtramp(frame->sf_code, TARGET_NR_sigreturn);
setup_sigcontext(regs, &frame->sf_sc);
for(i = 0; i < TARGET_NSIG_WORDS; i++) {
@ -231,7 +229,7 @@ void setup_frame(int sig, struct target_sigaction * ka,
regs->active_tc.gpr[ 5] = 0;
regs->active_tc.gpr[ 6] = frame_addr + offsetof(struct sigframe, sf_sc);
regs->active_tc.gpr[29] = frame_addr;
regs->active_tc.gpr[31] = frame_addr + offsetof(struct sigframe, sf_code);
regs->active_tc.gpr[31] = default_sigreturn;
/* The original kernel code sets CP0_EPC to the handler
* since it returns to userland using eret
* we cannot do this here, and we must set PC directly */
@ -305,8 +303,6 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
goto give_sigsegv;
}
install_sigtramp(frame->rs_code, TARGET_NR_rt_sigreturn);
tswap_siginfo(&frame->rs_info, info);
__put_user(0, &frame->rs_uc.tuc_flags);
@ -335,11 +331,13 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
env->active_tc.gpr[ 6] = frame_addr
+ offsetof(struct target_rt_sigframe, rs_uc);
env->active_tc.gpr[29] = frame_addr;
env->active_tc.gpr[31] = frame_addr
+ offsetof(struct target_rt_sigframe, rs_code);
/* The original kernel code sets CP0_EPC to the handler
* since it returns to userland using eret
* we cannot do this here, and we must set PC directly */
env->active_tc.gpr[31] = default_rt_sigreturn;
/*
* The original kernel code sets CP0_EPC to the handler
* since it returns to userland using eret
* we cannot do this here, and we must set PC directly
*/
env->active_tc.PC = env->active_tc.gpr[25] = ka->_sa_handler;
mips_set_hflags_isa_mode_from_pc(env);
unlock_user_struct(frame, frame_addr, 1);
@ -379,3 +377,19 @@ badframe:
force_sig(TARGET_SIGSEGV);
return -TARGET_QEMU_ESIGRETURN;
}
void setup_sigtramp(abi_ulong sigtramp_page)
{
uint32_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 2 * 8, 0);
assert(tramp != NULL);
#ifdef TARGET_ARCH_HAS_SETUP_FRAME
default_sigreturn = sigtramp_page;
install_sigtramp(tramp, TARGET_NR_sigreturn);
#endif
default_rt_sigreturn = sigtramp_page + 8;
install_sigtramp(tramp + 2, TARGET_NR_rt_sigreturn);
unlock_user(tramp, sigtramp_page, 2 * 8);
}

1
linux-user/mips/target_signal.h
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@ -73,6 +73,7 @@ typedef struct target_sigaltstack {
/* compare linux/arch/mips/kernel/signal.c:setup_frame() */
#define TARGET_ARCH_HAS_SETUP_FRAME
#endif
#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 1
/* bit-flags */
#define TARGET_SS_AUTODISARM (1U << 31) /* disable sas during sighandling */

2
linux-user/mips64/target_signal.h
View File

@ -76,4 +76,6 @@ typedef struct target_sigaltstack {
/* compare linux/arch/mips/kernel/signal.c:setup_frame() */
#define TARGET_ARCH_HAS_SETUP_FRAME
#endif
#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 1
#endif /* MIPS64_TARGET_SIGNAL_H */