/*
* Setup invocation of signal handler
*/
static int handle_signal(int sig, siginfo_t *info, struct k_sigaction *ka,
sigset_t *oldset, struct pt_regs *regs)
{
int rc;
/*
* If we're handling a signal that aborted a system call,
* set up the error return value before adding the signal
* frame to the stack.
*/
if (regs->syscall_nr >= 0) {
switch (regs->r00) {
case -ERESTART_RESTARTBLOCK:
case -ERESTARTNOHAND:
regs->r00 = -EINTR;
break;
case -ERESTARTSYS:
if (!(ka->sa.sa_flags & SA_RESTART)) {
regs->r00 = -EINTR;
break;
}
/* Fall through */
case -ERESTARTNOINTR:
regs->r06 = regs->syscall_nr;
pt_set_elr(regs, pt_elr(regs) - 4);
regs->r00 = regs->restart_r0;
break;
default:
break;
}
}
/*
* Set up the stack frame; not doing the SA_SIGINFO thing. We
* only set up the rt_frame flavor.
*/
rc = setup_rt_frame(sig, ka, info, oldset, regs);
/* If there was an error on setup, no signal was delivered. */
if (rc)
return rc;
block_sigmask(ka, sig);
return 0;
}
/*
* OK, we're invoking a handler
*/
static int
handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *oldset, struct pt_regs *regs, unsigned int save_r0)
{
int ret;
/* Set up the stack frame */
if (ka->sa.sa_flags & SA_SIGINFO)
ret = setup_rt_frame(sig, ka, info, oldset, regs);
else
ret = setup_frame(sig, ka, oldset, regs);
if (ret == 0)
block_sigmask(ka, sig);
return ret;
}
static int handle_signal(unsigned long sig, siginfo_t *info,
struct k_sigaction *ka, sigset_t *oldset,
struct pt_regs *regs)
{
int ret;
/* Are we from a system call? */
if (regs->faultnum == INT_SWINT_1) {
/* If so, check system call restarting.. */
switch (regs->regs[0]) {
case -ERESTART_RESTARTBLOCK:
case -ERESTARTNOHAND:
regs->regs[0] = -EINTR;
break;
case -ERESTARTSYS:
if (!(ka->sa.sa_flags & SA_RESTART)) {
regs->regs[0] = -EINTR;
break;
}
/* fallthrough */
case -ERESTARTNOINTR:
/* Reload caller-saves to restore r0..r5 and r10. */
regs->flags |= PT_FLAGS_CALLER_SAVES;
regs->regs[0] = regs->orig_r0;
regs->pc -= 8;
}
}
/* Set up the stack frame */
#ifdef CONFIG_COMPAT
if (is_compat_task())
ret = compat_setup_rt_frame(sig, ka, info, oldset, regs);
else
#endif
ret = setup_rt_frame(sig, ka, info, oldset, regs);
if (ret == 0) {
/* This code is only called from system calls or from
* the work_pending path in the return-to-user code, and
* either way we can re-enable interrupts unconditionally.
*/
block_sigmask(ka, sig);
}
return ret;
}
/*
* OK, we're invoking a handler
*/
static int
handle_signal(unsigned long sig, struct k_sigaction *ka,
siginfo_t *info, sigset_t *oldset,
struct pt_regs * regs)
{
struct thread_info *thread = current_thread_info();
struct task_struct *tsk = current;
int usig = sig;
int ret;
/*
* translate the signal
*/
if (usig < 32 && thread->exec_domain && thread->exec_domain->signal_invmap)
usig = thread->exec_domain->signal_invmap[usig];
/*
* Set up the stack frame
*/
if (ka->sa.sa_flags & SA_SIGINFO)
ret = setup_rt_frame(usig, ka, info, oldset, regs);
else
ret = setup_frame(usig, ka, oldset, regs);
/*
* Check that the resulting registers are actually sane.
*/
ret |= !valid_user_regs(regs);
if (ret != 0) {
#ifdef CONFIG_SHLOG_SYSTEM
rlog_app_start( current, 0, 0, sig, 0, regs );
#endif /* CONFIG_SHLOG_SYSTEM */
force_sigsegv(sig, tsk);
return ret;
}
/*
* Block the signal if we were successful.
*/
block_sigmask(ka, sig);
return 0;
}
/*
* OK, we're invoking a handler
*/
static int
handle_signal(int sig, siginfo_t *info, struct k_sigaction *ka,
sigset_t *oldset, struct pt_regs *regs)
{
int ret;
/* are we from a system call? to see pt_regs->orig_p0 */
if (regs->orig_p0 >= 0)
/* If so, check system call restarting.. */
handle_restart(regs, ka, 1);
/* set up the stack frame */
ret = setup_rt_frame(sig, ka, info, oldset, regs);
if (ret == 0)
block_sigmask(ka, sig);
return ret;
}
static inline int
handle_signal(unsigned long signr, struct k_sigaction *ka,
siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
{
int err;
if (ka->sa.sa_flags & SA_SIGINFO)
err = setup_rt_frame(ka, regs, signr, oldset, info);
else
err = setup_frame(ka, regs, signr, oldset);
if (err)
return err;
block_sigmask(ka, signr);
tracehook_signal_handler(signr, info, ka, regs, 0);
return 0;
}
static int handle_signal(unsigned long sig, siginfo_t *info,
struct k_sigaction *ka, sigset_t *oldset,
struct pt_regs *regs)
{
int ret;
if (regs->faultnum == INT_SWINT_1) {
switch (regs->regs[0]) {
case -ERESTART_RESTARTBLOCK:
case -ERESTARTNOHAND:
regs->regs[0] = -EINTR;
break;
case -ERESTARTSYS:
if (!(ka->sa.sa_flags & SA_RESTART)) {
regs->regs[0] = -EINTR;
break;
}
case -ERESTARTNOINTR:
regs->flags |= PT_FLAGS_CALLER_SAVES;
regs->regs[0] = regs->orig_r0;
regs->pc -= 8;
}
}
#ifdef CONFIG_COMPAT
if (is_compat_task())
ret = compat_setup_rt_frame(sig, ka, info, oldset, regs);
else
#endif
ret = setup_rt_frame(sig, ka, info, oldset, regs);
if (ret == 0) {
block_sigmask(ka, sig);
}
return ret;
}
static int handle_signal(unsigned long sig, siginfo_t *info,
struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs)
{
int ret;
struct mips_abi *abi = current->thread.abi;
void *vdso = current->mm->context.vdso;
if (regs->regs[0]) {
switch(regs->regs[2]) {
case ERESTART_RESTARTBLOCK:
case ERESTARTNOHAND:
regs->regs[2] = EINTR;
break;
case ERESTARTSYS:
if (!(ka->sa.sa_flags & SA_RESTART)) {
regs->regs[2] = EINTR;
break;
}
/* fallthrough */
case ERESTARTNOINTR:
regs->regs[7] = regs->regs[26];
regs->regs[2] = regs->regs[0];
regs->cp0_epc -= 4;
}
regs->regs[0] = 0; /* Don't deal with this again. */
}
if (sig_uses_siginfo(ka))
ret = abi->setup_rt_frame(vdso + abi->rt_signal_return_offset,
ka, regs, sig, oldset, info);
else
ret = abi->setup_frame(vdso + abi->signal_return_offset,
ka, regs, sig, oldset);
if (ret)
return ret;
block_sigmask(ka, sig);
return ret;
}
/*
* handle the actual delivery of a signal to userspace
*/
static int handle_signal(int sig,
siginfo_t *info, struct k_sigaction *ka,
sigset_t *oldset, struct pt_regs *regs)
{
int ret;
/* Are we from a system call? */
if (regs->orig_d0 >= 0) {
/* If so, check system call restarting.. */
switch (regs->d0) {
case -ERESTART_RESTARTBLOCK:
case -ERESTARTNOHAND:
regs->d0 = -EINTR;
break;
case -ERESTARTSYS:
if (!(ka->sa.sa_flags & SA_RESTART)) {
regs->d0 = -EINTR;
break;
}
/* fallthrough */
case -ERESTARTNOINTR:
regs->d0 = regs->orig_d0;
stepback(regs);
}
}
/* Set up the stack frame */
if (ka->sa.sa_flags & SA_SIGINFO)
ret = setup_rt_frame(sig, ka, info, oldset, regs);
else
ret = setup_frame(sig, ka, oldset, regs);
if (ret == 0)
block_sigmask(ka, sig);
return ret;
}
static int handle_signal(int sig, siginfo_t *info, struct k_sigaction *ka,
sigset_t *oldset, struct pt_regs *regs)
{
int rc;
if (regs->syscall_nr >= 0) {
switch (regs->r00) {
case -ERESTART_RESTARTBLOCK:
case -ERESTARTNOHAND:
regs->r00 = -EINTR;
break;
case -ERESTARTSYS:
if (!(ka->sa.sa_flags & SA_RESTART)) {
regs->r00 = -EINTR;
break;
}
case -ERESTARTNOINTR:
regs->r06 = regs->syscall_nr;
pt_set_elr(regs, pt_elr(regs) - 4);
regs->r00 = regs->restart_r0;
break;
default:
break;
}
}
rc = setup_rt_frame(sig, ka, info, oldset, regs);
if (rc)
return rc;
block_sigmask(ka, sig);
return 0;
}
/*
* OK, we're invoking a handler
*/
static int handle_signal(unsigned long sig, struct k_sigaction *ka,
siginfo_t *info, sigset_t *oldset,
struct pt_regs *regs, int syscall)
{
struct thread_info *thread = current_thread_info();
struct task_struct *tsk = current;
sigset_t blocked;
int usig = sig;
int ret;
/*
* If we were from a system call, check for system call restarting...
*/
if (syscall) {
switch (regs->UCreg_00) {
case -ERESTART_RESTARTBLOCK:
case -ERESTARTNOHAND:
regs->UCreg_00 = -EINTR;
break;
case -ERESTARTSYS:
if (!(ka->sa.sa_flags & SA_RESTART)) {
regs->UCreg_00 = -EINTR;
break;
}
/* fallthrough */
case -ERESTARTNOINTR:
setup_syscall_restart(regs);
}
}
/*
* translate the signal
*/
if (usig < 32 && thread->exec_domain
&& thread->exec_domain->signal_invmap)
usig = thread->exec_domain->signal_invmap[usig];
/*
* Set up the stack frame
*/
if (ka->sa.sa_flags & SA_SIGINFO)
ret = setup_rt_frame(usig, ka, info, oldset, regs);
else
ret = setup_frame(usig, ka, oldset, regs);
/*
* Check that the resulting registers are actually sane.
*/
ret |= !valid_user_regs(regs);
if (ret != 0) {
force_sigsegv(sig, tsk);
return ret;
}
/*
* Block the signal if we were successful.
*/
block_sigmask(ka, sig);
return 0;
}
static int do_signal(struct pt_regs *regs)
{
sigset_t *oldset;
siginfo_t info;
int signr;
struct k_sigaction ka;
int ret;
int is32 = is_32bit_task();
if (current_thread_info()->local_flags & _TLF_RESTORE_SIGMASK)
oldset = ¤t->saved_sigmask;
else
oldset = ¤t->blocked;
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
/* Is there any syscall restart business here ? */
check_syscall_restart(regs, &ka, signr > 0);
if (signr <= 0) {
struct thread_info *ti = current_thread_info();
/* No signal to deliver -- put the saved sigmask back */
if (ti->local_flags & _TLF_RESTORE_SIGMASK) {
ti->local_flags &= ~_TLF_RESTORE_SIGMASK;
sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
}
regs->trap = 0;
return 0; /* no signals delivered */
}
#ifndef CONFIG_PPC_ADV_DEBUG_REGS
/*
* Reenable the DABR before delivering the signal to
* user space. The DABR will have been cleared if it
* triggered inside the kernel.
*/
if (current->thread.dabr)
set_dabr(current->thread.dabr);
#endif
/* Re-enable the breakpoints for the signal stack */
thread_change_pc(current, regs);
if (is32) {
if (ka.sa.sa_flags & SA_SIGINFO)
ret = handle_rt_signal32(signr, &ka, &info, oldset,
regs);
else
ret = handle_signal32(signr, &ka, &info, oldset,
regs);
} else {
ret = handle_rt_signal64(signr, &ka, &info, oldset, regs);
}
regs->trap = 0;
if (ret) {
block_sigmask(&ka, signr);
/*
* A signal was successfully delivered; the saved sigmask is in
* its frame, and we can clear the TLF_RESTORE_SIGMASK flag.
*/
current_thread_info()->local_flags &= ~_TLF_RESTORE_SIGMASK;
/*
* Let tracing know that we've done the handler setup.
*/
tracehook_signal_handler(signr, &info, &ka, regs,
test_thread_flag(TIF_SINGLESTEP));
}
return ret;
}
