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linux-user: Introduce host_signal_mask

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Do not directly access the uc_sigmask member.
This is preparation for a sparc64 fix.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2022-02-08 09:30:42 +03:00
parent 620d0b49a4
commit c8c89a6a30
12 changed files with 63 additions and 10 deletions
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18
linux-user/signal.c
View file

@ -820,6 +820,7 @@ static void host_signal_handler(int host_sig, siginfo_t *info, void *puc)
int guest_sig;
uintptr_t pc = 0;
bool sync_sig = false;
void *sigmask = host_signal_mask(uc);
/*
* Non-spoofed SIGSEGV and SIGBUS are synchronous, and need special
@ -849,8 +850,7 @@ static void host_signal_handler(int host_sig, siginfo_t *info, void *puc)
if (info->si_code == SEGV_ACCERR && h2g_valid(host_addr)) {
/* If this was a write to a TB protected page, restart. */
if (is_write &&
handle_sigsegv_accerr_write(cpu, &uc->uc_sigmask,
pc, guest_addr)) {
handle_sigsegv_accerr_write(cpu, sigmask, pc, guest_addr)) {
return;
}
@ -865,10 +865,10 @@ static void host_signal_handler(int host_sig, siginfo_t *info, void *puc)
}
}
sigprocmask(SIG_SETMASK, &uc->uc_sigmask, NULL);
sigprocmask(SIG_SETMASK, sigmask, NULL);
cpu_loop_exit_sigsegv(cpu, guest_addr, access_type, maperr, pc);
} else {
sigprocmask(SIG_SETMASK, &uc->uc_sigmask, NULL);
sigprocmask(SIG_SETMASK, sigmask, NULL);
if (info->si_code == BUS_ADRALN) {
cpu_loop_exit_sigbus(cpu, guest_addr, access_type, pc);
}
@ -909,17 +909,15 @@ static void host_signal_handler(int host_sig, siginfo_t *info, void *puc)
* now and it getting out to the main loop. Signals will be
* unblocked again in process_pending_signals().
*
* WARNING: we cannot use sigfillset() here because the uc_sigmask
* WARNING: we cannot use sigfillset() here because the sigmask
* field is a kernel sigset_t, which is much smaller than the
* libc sigset_t which sigfillset() operates on. Using sigfillset()
* would write 0xff bytes off the end of the structure and trash
* data on the struct.
* We can't use sizeof(uc->uc_sigmask) either, because the libc
* headers define the struct field with the wrong (too large) type.
*/
memset(&uc->uc_sigmask, 0xff, SIGSET_T_SIZE);
sigdelset(&uc->uc_sigmask, SIGSEGV);
sigdelset(&uc->uc_sigmask, SIGBUS);
memset(sigmask, 0xff, SIGSET_T_SIZE);
sigdelset(sigmask, SIGSEGV);
sigdelset(sigmask, SIGBUS);
/* interrupt the virtual CPU as soon as possible */
cpu_exit(thread_cpu);