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linux-user: Support for restarting system calls for SH4 targets 

Update the SH4 main loop and sigreturn code:
 * on TARGET_ERESTARTSYS, wind guest PC backwards to repeat syscall insn
 * set all guest CPU state within signal.c code on sigreturn
 * handle TARGET_QEMU_ESIGRETURN in the main loop as the indication
   that the main loop should not touch any guest CPU state

Signed-off-by: Timothy Edward Baldwin <T.E.Baldwin99@members.leeds.ac.uk>
Message-id: 1441497448-32489-12-git-send-email-T.E.Baldwin99@members.leeds.ac.uk
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
[PMM: tweak commit message; drop TARGET_USE_ERESTARTSYS define]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Timothy E Baldwin 2016-05-12 18:47:35 +01:00 committed by Riku Voipio
parent c0bea68f9e
commit ba41249678
3 changed files with 12 additions and 11 deletions
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6
linux-user/main.c
View File

@ -2826,7 +2826,11 @@ void cpu_loop(CPUSH4State *env)
env->gregs[0],
env->gregs[1],
0, 0);
env->gregs[0] = ret;
if (ret == -TARGET_ERESTARTSYS) {
env->pc -= 2;
} else if (ret != -TARGET_QEMU_ESIGRETURN) {
env->gregs[0] = ret;
}
break;
case EXCP_INTERRUPT:
/* just indicate that signals should be handled asap */

1
linux-user/sh4/target_signal.h
View File

@ -26,4 +26,5 @@ static inline abi_ulong get_sp_from_cpustate(CPUSH4State *state)
return state->gregs[15];
}
#endif /* TARGET_SIGNAL_H */

16
linux-user/signal.c
View File

@ -3202,13 +3202,12 @@ static void setup_sigcontext(struct target_sigcontext *sc,
__put_user(mask, &sc->oldmask);
}
static void restore_sigcontext(CPUSH4State *regs, struct target_sigcontext *sc,
target_ulong *r0_p)
static void restore_sigcontext(CPUSH4State *regs, struct target_sigcontext *sc)
{
int i;
#define COPY(x) __get_user(regs->x, &sc->sc_##x)
COPY(gregs[1]);
COPY(gregs[0]); COPY(gregs[1]);
COPY(gregs[2]); COPY(gregs[3]);
COPY(gregs[4]); COPY(gregs[5]);
COPY(gregs[6]); COPY(gregs[7]);
@ -3228,7 +3227,6 @@ static void restore_sigcontext(CPUSH4State *regs, struct target_sigcontext *sc,
__get_user(regs->fpul, &sc->sc_fpul);
regs->tra = -1; /* disable syscall checks */
__get_user(*r0_p, &sc->sc_gregs[0]);
}
static void setup_frame(int sig, struct target_sigaction *ka,
@ -3345,7 +3343,6 @@ long do_sigreturn(CPUSH4State *regs)
abi_ulong frame_addr;
sigset_t blocked;
target_sigset_t target_set;
target_ulong r0;
int i;
int err = 0;
@ -3366,10 +3363,10 @@ long do_sigreturn(CPUSH4State *regs)
target_to_host_sigset_internal(&blocked, &target_set);
do_sigprocmask(SIG_SETMASK, &blocked, NULL);
restore_sigcontext(regs, &frame->sc, &r0);
restore_sigcontext(regs, &frame->sc);
unlock_user_struct(frame, frame_addr, 0);
return r0;
return -TARGET_QEMU_ESIGRETURN;
badframe:
unlock_user_struct(frame, frame_addr, 0);
@ -3382,7 +3379,6 @@ long do_rt_sigreturn(CPUSH4State *regs)
struct target_rt_sigframe *frame;
abi_ulong frame_addr;
sigset_t blocked;
target_ulong r0;
frame_addr = regs->gregs[15];
trace_user_do_rt_sigreturn(regs, frame_addr);
@ -3393,7 +3389,7 @@ long do_rt_sigreturn(CPUSH4State *regs)
target_to_host_sigset(&blocked, &frame->uc.tuc_sigmask);
do_sigprocmask(SIG_SETMASK, &blocked, NULL);
restore_sigcontext(regs, &frame->uc.tuc_mcontext, &r0);
restore_sigcontext(regs, &frame->uc.tuc_mcontext);
if (do_sigaltstack(frame_addr +
offsetof(struct target_rt_sigframe, uc.tuc_stack),
@ -3402,7 +3398,7 @@ long do_rt_sigreturn(CPUSH4State *regs)
}
unlock_user_struct(frame, frame_addr, 0);
return r0;
return -TARGET_QEMU_ESIGRETURN;
badframe:
unlock_user_struct(frame, frame_addr, 0);