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/*
* Emulation of BSD signals
*
* Copyright (c) 2003 - 2008 Fabrice Bellard
* Copyright (c) 2013 Stacey Son
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu.h"
#include "signal-common.h"
#include "hw/core/tcg-cpu-ops.h"
#include "host-signal.h"
/*
* Stubbed out routines until we merge signal support from bsd-user
* fork.
*/
static struct target_sigaction sigact_table[TARGET_NSIG];
static void host_signal_handler(int host_sig, siginfo_t *info, void *puc);
/*
* The BSD ABIs use the same singal numbers across all the CPU architectures, so
* (unlike Linux) these functions are just the identity mapping. This might not
* be true for XyzBSD running on AbcBSD, which doesn't currently work.
*/
int host_to_target_signal(int sig)
{
return sig;
}
int target_to_host_signal(int sig)
{
return sig;
}
/*
* Queue a signal so that it will be send to the virtual CPU as soon as
* possible.
*/
void queue_signal(CPUArchState *env, int sig, int si_type,
target_siginfo_t *info)
{
qemu_log_mask(LOG_UNIMP, "No signal queueing, dropping signal %d\n", sig);
}
static int fatal_signal(int sig)
{
switch (sig) {
case TARGET_SIGCHLD:
case TARGET_SIGURG:
case TARGET_SIGWINCH:
case TARGET_SIGINFO:
/* Ignored by default. */
return 0;
case TARGET_SIGCONT:
case TARGET_SIGSTOP:
case TARGET_SIGTSTP:
case TARGET_SIGTTIN:
case TARGET_SIGTTOU:
/* Job control signals. */
return 0;
default:
return 1;
}
}
/*
* Force a synchronously taken QEMU_SI_FAULT signal. For QEMU the
* 'force' part is handled in process_pending_signals().
*/
void force_sig_fault(int sig, int code, abi_ulong addr)
{
CPUState *cpu = thread_cpu;
CPUArchState *env = cpu->env_ptr;
target_siginfo_t info = {};
info.si_signo = sig;
info.si_errno = 0;
info.si_code = code;
info.si_addr = addr;
queue_signal(env, sig, QEMU_SI_FAULT, &info);
}
static void host_signal_handler(int host_sig, siginfo_t *info, void *puc)
{
}
void signal_init(void)
{
TaskState *ts = (TaskState *)thread_cpu->opaque;
struct sigaction act;
struct sigaction oact;
int i;
int host_sig;
/* Set the signal mask from the host mask. */
sigprocmask(0, 0, &ts->signal_mask);
sigfillset(&act.sa_mask);
act.sa_sigaction = host_signal_handler;
act.sa_flags = SA_SIGINFO;
for (i = 1; i <= TARGET_NSIG; i++) {
#ifdef CONFIG_GPROF
if (i == TARGET_SIGPROF) {
continue;
}
#endif
host_sig = target_to_host_signal(i);
sigaction(host_sig, NULL, &oact);
if (oact.sa_sigaction == (void *)SIG_IGN) {
sigact_table[i - 1]._sa_handler = TARGET_SIG_IGN;
} else if (oact.sa_sigaction == (void *)SIG_DFL) {
sigact_table[i - 1]._sa_handler = TARGET_SIG_DFL;
}
/*
* If there's already a handler installed then something has
* gone horribly wrong, so don't even try to handle that case.
* Install some handlers for our own use. We need at least
* SIGSEGV and SIGBUS, to detect exceptions. We can not just
* trap all signals because it affects syscall interrupt
* behavior. But do trap all default-fatal signals.
*/
if (fatal_signal(i)) {
sigaction(host_sig, &act, NULL);
}
}
}
void process_pending_signals(CPUArchState *cpu_env)
{
}
void cpu_loop_exit_sigsegv(CPUState *cpu, target_ulong addr,
MMUAccessType access_type, bool maperr, uintptr_t ra)
{
const struct TCGCPUOps *tcg_ops = CPU_GET_CLASS(cpu)->tcg_ops;
if (tcg_ops->record_sigsegv) {
tcg_ops->record_sigsegv(cpu, addr, access_type, maperr, ra);
}
force_sig_fault(TARGET_SIGSEGV,
maperr ? TARGET_SEGV_MAPERR : TARGET_SEGV_ACCERR,
addr);
cpu->exception_index = EXCP_INTERRUPT;
cpu_loop_exit_restore(cpu, ra);
}
void cpu_loop_exit_sigbus(CPUState *cpu, target_ulong addr,
MMUAccessType access_type, uintptr_t ra)
{
const struct TCGCPUOps *tcg_ops = CPU_GET_CLASS(cpu)->tcg_ops;
if (tcg_ops->record_sigbus) {
tcg_ops->record_sigbus(cpu, addr, access_type, ra);
}
force_sig_fault(TARGET_SIGBUS, TARGET_BUS_ADRALN, addr);
cpu->exception_index = EXCP_INTERRUPT;
cpu_loop_exit_restore(cpu, ra);
}
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