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linux-user: Forget about synchronous signal once it is delivered

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Commit 655ed67c2a248cf which switched synchronous signals to
benig recorded in ts->sync_signal rather than in a queue
with every other signal had a bug: we failed to clear
the flag indicating that a synchronous signal was pending
when we delivered it. This meant that we would take the signal
again and again every time the guest made a syscall.
(This is a bug introduced in my refactoring of Timothy Baldwin's
original code.)

Fix this by passing in the struct emulated_sigtable* to
handle_pending_signal(), so that we clear the pending flag
in the ts->sync_signal struct when handling a synchronous signal.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Peter Maydell 2016-07-06 15:09:29 +01:00 committed by Riku Voipio
parent f2c2fb50be
commit 31efaef1d9
1 changed files with 4 additions and 4 deletions
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8
linux-user/signal.c
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@ -5826,7 +5826,8 @@ long do_rt_sigreturn(CPUArchState *env)
#endif
static void handle_pending_signal(CPUArchState *cpu_env, int sig)
static void handle_pending_signal(CPUArchState *cpu_env, int sig,
struct emulated_sigtable *k)
{
CPUState *cpu = ENV_GET_CPU(cpu_env);
abi_ulong handler;
@ -5834,7 +5835,6 @@ static void handle_pending_signal(CPUArchState *cpu_env, int sig)
target_sigset_t target_old_set;
struct target_sigaction *sa;
TaskState *ts = cpu->opaque;
struct emulated_sigtable *k = &ts->sigtab[sig - 1];
trace_user_handle_signal(cpu_env, sig);
/* dequeue signal */
@ -5937,7 +5937,7 @@ void process_pending_signals(CPUArchState *cpu_env)
sigact_table[sig - 1]._sa_handler = TARGET_SIG_DFL;
}
handle_pending_signal(cpu_env, sig);
handle_pending_signal(cpu_env, sig, &ts->sync_signal);
}
for (sig = 1; sig <= TARGET_NSIG; sig++) {
@ -5947,7 +5947,7 @@ void process_pending_signals(CPUArchState *cpu_env)
if (ts->sigtab[sig - 1].pending &&
(!sigismember(blocked_set,
target_to_host_signal_table[sig]))) {
handle_pending_signal(cpu_env, sig);
handle_pending_signal(cpu_env, sig, &ts->sigtab[sig - 1]);
/* Restart scan from the beginning */
sig = 1;
}