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linux-user/signal.c: Generate opcode data for restorer in setup_rt_frame 

Original implementation uses do_rt_sigreturn directly in host space,
when a guest program is in unwind procedure in guest space, it will get
an incorrect restore address, then causes unwind failure.

Also cleanup the original incorrect indentation.

Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Chen Gang 2016-03-29 21:53:49 +08:00 committed by Riku Voipio
parent 167e4cdc29
commit f1d9d1071c
1 changed files with 10 additions and 2 deletions
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10
linux-user/signal.c
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@ -5599,8 +5599,13 @@ struct target_rt_sigframe {
unsigned char save_area[16]; /* caller save area */
struct target_siginfo info;
struct target_ucontext uc;
abi_ulong retcode[2];
};
#define INSN_MOVELI_R10_139 0x00045fe551483000ULL /* { moveli r10, 139 } */
#define INSN_SWINT1 0x286b180051485000ULL /* { swint1 } */
static void setup_sigcontext(struct target_sigcontext *sc,
CPUArchState *env, int signo)
{
@ -5676,9 +5681,12 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka,
__put_user(target_sigaltstack_used.ss_size, &frame->uc.tuc_stack.ss_size);
setup_sigcontext(&frame->uc.tuc_mcontext, env, info->si_signo);
restorer = (unsigned long) do_rt_sigreturn;
if (ka->sa_flags & TARGET_SA_RESTORER) {
restorer = (unsigned long) ka->sa_restorer;
} else {
__put_user(INSN_MOVELI_R10_139, &frame->retcode[0]);
__put_user(INSN_SWINT1, &frame->retcode[1]);
restorer = frame_addr + offsetof(struct target_rt_sigframe, retcode);
}
env->pc = (unsigned long) ka->_sa_handler;
env->regs[TILEGX_R_SP] = (unsigned long) frame;