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linux-user/sh4: Clean env->flags on signal boundaries 

If a signal is delivered during the execution of a delay slot,
or a gUSA region, clear those bits from the environment so that
the signal handler does not start in that same state.

Cleaning the bits on signal return is paranoid good sense.

Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Message-Id: <20170718200255.31647-10-rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
master
Richard Henderson 2017-07-18 10:02:34 -10:00 committed by Aurelien Jarno
parent b0e4f0edf5
commit b0e9c51a00
1 changed files with 3 additions and 0 deletions
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3
linux-user/signal.c
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@ -3549,6 +3549,7 @@ static void restore_sigcontext(CPUSH4State *regs, struct target_sigcontext *sc)
__get_user(regs->fpul, &sc->sc_fpul);
regs->tra = -1; /* disable syscall checks */
regs->flags &= ~(DELAY_SLOT_MASK | GUSA_MASK);
}
static void setup_frame(int sig, struct target_sigaction *ka,
@ -3592,6 +3593,7 @@ static void setup_frame(int sig, struct target_sigaction *ka,
regs->gregs[5] = 0;
regs->gregs[6] = frame_addr += offsetof(typeof(*frame), sc);
regs->pc = (unsigned long) ka->_sa_handler;
regs->flags &= ~(DELAY_SLOT_MASK | GUSA_MASK);
unlock_user_struct(frame, frame_addr, 1);
return;
@ -3654,6 +3656,7 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka,
regs->gregs[5] = frame_addr + offsetof(typeof(*frame), info);
regs->gregs[6] = frame_addr + offsetof(typeof(*frame), uc);
regs->pc = (unsigned long) ka->_sa_handler;
regs->flags &= ~(DELAY_SLOT_MASK | GUSA_MASK);
unlock_user_struct(frame, frame_addr, 1);
return;