/*
* OK, we're invoking a handler
*/
static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
{
sigset_t *oldset = sigmask_to_save();
int ret;
/*
* Set up the stack frame
*/
if (ksig->ka.sa.sa_flags & SA_SIGINFO)
ret = setup_rt_frame(ksig, oldset, regs);
else
ret = setup_frame(ksig, oldset, regs);
/*
* Check that the resulting registers are actually sane.
*/
ret |= !valid_user_regs(regs);
signal_setup_done(ret, ksig, 0);
}
/*
* handle the actual delivery of a signal to userspace
*/
static int handle_signal(int sig,
siginfo_t *info, struct k_sigaction *ka,
struct pt_regs *regs)
{
sigset_t *oldset = sigmask_to_save();
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)
return ret;
signal_delivered(sig, info, ka, regs,
test_thread_flag(TIF_SINGLESTEP));
return 0;
}
static void handle_signal(unsigned long sig, siginfo_t *info,
struct k_sigaction *ka, struct pt_regs *regs)
{
sigset_t *oldset = sigmask_to_save();
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;
signal_delivered(sig, info, ka, regs, 0);
}
/*
* OK, we're invoking a handler
*/
static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
{
struct thread_info *thread = current_thread_info();
struct task_struct *tsk = current;
sigset_t *oldset = sigmask_to_save();
int usig = ksig->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 (is_compat_task()) {
if (ksig->ka.sa.sa_flags & SA_SIGINFO)
ret = compat_setup_rt_frame(usig, ksig, oldset, regs);
else
ret = compat_setup_frame(usig, ksig, oldset, regs);
} else {
ret = setup_rt_frame(usig, ksig, oldset, regs);
}
/*
* Check that the resulting registers are actually sane.
*/
ret |= !valid_user_regs(®s->user_regs);
/*
* Fast forward the stepping logic so we step into the signal
* handler.
*/
if (!ret)
user_fastforward_single_step(tsk);
signal_setup_done(ret, ksig, 0);
}
static long
handle_signal (unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
struct sigscratch *scr)
{
if (!setup_frame(sig, ka, info, sigmask_to_save(), scr))
return 0;
spin_lock_irq(¤t->sighand->siglock);
sigorsets(¤t->blocked, ¤t->blocked, &ka->sa.sa_mask);
if (!(ka->sa.sa_flags & SA_NODEFER))
sigaddset(¤t->blocked, sig);
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
/*
* Let tracing know that we've done the handler setup.
*/
tracehook_signal_handler(sig, info, ka, &scr->pt,
test_thread_flag(TIF_SINGLESTEP));
return 1;
}
/*
* OK, we're invoking a handler
*/
static void handle_signal(unsigned long sig, struct k_sigaction *ka,
siginfo_t *info, struct pt_regs *regs)
{
struct task_struct *tsk = current;
sigset_t *oldset = sigmask_to_save();
int usig = sig;
int ret;
/*
* Set up the stack frame
*/
if (is_compat_task()) {
if (ka->sa.sa_flags & SA_SIGINFO)
ret = compat_setup_rt_frame(usig, ka, info, oldset,
regs);
else
ret = compat_setup_frame(usig, ka, oldset, regs);
} else {
ret = setup_rt_frame(usig, ka, info, oldset, regs);
}
/*
* Check that the resulting registers are actually sane.
*/
ret |= !valid_user_regs(®s->user_regs);
if (ret != 0) {
force_sigsegv(sig, tsk);
return;
}
/*
* Fast forward the stepping logic so we step into the signal
* handler.
*/
user_fastforward_single_step(tsk);
signal_delivered(sig, info, ka, regs, 0);
}
static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
{
sigset_t *oldset = sigmask_to_save();
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 (!(ksig->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(ksig, oldset, regs);
else
#endif
ret = setup_rt_frame(ksig, oldset, regs);
signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
}
/*
* handle the actual delivery of a signal to userspace
*/
static int handle_signal(struct ksignal *ksig, struct pt_regs *regs)
{
sigset_t *oldset = sigmask_to_save();
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 (!(ksig->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 (ksig->ka.sa.sa_flags & SA_SIGINFO)
ret = setup_rt_frame(ksig, oldset, regs);
else
ret = setup_frame(ksig, oldset, regs);
signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
return 0;
}
/*
* OK, we're invoking a handler
*/
static void handle_signal(struct ksignal *ksig)
{
sigset_t *oldset = sigmask_to_save();
int ret;
/* Are we from a system call? */
if (__frame->syscallno != -1) {
/* If so, check system call restarting.. */
switch (__frame->gr8) {
case -ERESTART_RESTARTBLOCK:
case -ERESTARTNOHAND:
__frame->gr8 = -EINTR;
break;
case -ERESTARTSYS:
if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
__frame->gr8 = -EINTR;
break;
}
/* fallthrough */
case -ERESTARTNOINTR:
__frame->gr8 = __frame->orig_gr8;
__frame->pc -= 4;
}
__frame->syscallno = -1;
}
/* Set up the stack frame */
if (ksig->ka.sa.sa_flags & SA_SIGINFO)
ret = setup_rt_frame(ksig, oldset);
else
ret = setup_frame(ksig, oldset);
signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
} /* end handle_signal() */
static inline void
handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
struct pt_regs *regs, int syscall)
{
int ret;
/*
* Set up the stack frame
*/
ret = setup_rt_frame(sig, ka, info, sigmask_to_save(), regs);
/*
* Check that the resulting registers are sane
*/
ret |= !valid_user_regs(regs);
/*
* Block the signal if we were successful.
*/
if (ret != 0)
force_sigsegv(sig, current);
else
signal_delivered(sig, info, ka, regs, 0);
}
/* Note that 'init' is a special process: it doesn't get signals it doesn't
* want to handle. Thus you cannot kill init even with a SIGKILL even by
* mistake.
*/
static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
{
struct k_sigaction ka;
int restart_syscall;
sigset_t *oldset = sigmask_to_save();
siginfo_t info;
int signr;
/* It's a lot of work and synchronization to add a new ptrace
* register for GDB to save and restore in order to get
* orig_i0 correct for syscall restarts when debugging.
*
* Although it should be the case that most of the global
* registers are volatile across a system call, glibc already
* depends upon that fact that we preserve them. So we can't
* just use any global register to save away the orig_i0 value.
*
* In particular %g2, %g3, %g4, and %g5 are all assumed to be
* preserved across a system call trap by various pieces of
* code in glibc.
*
* %g7 is used as the "thread register". %g6 is not used in
* any fixed manner. %g6 is used as a scratch register and
* a compiler temporary, but it's value is never used across
* a system call. Therefore %g6 is usable for orig_i0 storage.
*/
if (pt_regs_is_syscall(regs) &&
(regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
regs->u_regs[UREG_G6] = orig_i0;
#ifdef CONFIG_COMPAT
if (test_thread_flag(TIF_32BIT)) {
extern void do_signal32(sigset_t *, struct pt_regs *);
do_signal32(oldset, regs);
return;
}
#endif
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
restart_syscall = 0;
if (pt_regs_is_syscall(regs) &&
(regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
restart_syscall = 1;
orig_i0 = regs->u_regs[UREG_G6];
}
if (signr > 0) {
if (restart_syscall)
syscall_restart(orig_i0, regs, &ka.sa);
handle_signal(signr, &ka, &info, oldset, regs);
return;
}
if (restart_syscall &&
(regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
regs->u_regs[UREG_I0] == ERESTARTSYS ||
regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
/* replay the system call when we are done */
regs->u_regs[UREG_I0] = orig_i0;
regs->tpc -= 4;
regs->tnpc -= 4;
pt_regs_clear_syscall(regs);
}
if (restart_syscall &&
regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
regs->u_regs[UREG_G1] = __NR_restart_syscall;
regs->tpc -= 4;
regs->tnpc -= 4;
pt_regs_clear_syscall(regs);
}
/* If there's no signal to deliver, we just put the saved sigmask
* back
*/
restore_saved_sigmask();
}
static inline int
setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs)
{
struct rt_signal_frame __user *sf;
int wsaved, err, sf_size;
void __user *tail;
/* 1. Make sure everything is clean */
synchronize_user_stack();
save_and_clear_fpu();
wsaved = get_thread_wsaved();
sf_size = sizeof(struct rt_signal_frame);
if (current_thread_info()->fpsaved[0] & FPRS_FEF)
sf_size += sizeof(__siginfo_fpu_t);
if (wsaved)
sf_size += sizeof(__siginfo_rwin_t);
sf = (struct rt_signal_frame __user *)
get_sigframe(ksig, regs, sf_size);
if (invalid_frame_pointer (sf)) {
do_exit(SIGILL); /* won't return, actually */
return -EINVAL;
}
tail = (sf + 1);
/* 2. Save the current process state */
err = copy_to_user(&sf->regs, regs, sizeof (*regs));
if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
__siginfo_fpu_t __user *fpu_save = tail;
tail += sizeof(__siginfo_fpu_t);
err |= save_fpu_state(regs, fpu_save);
err |= __put_user((u64)fpu_save, &sf->fpu_save);
} else {
err |= __put_user(0, &sf->fpu_save);
}
if (wsaved) {
__siginfo_rwin_t __user *rwin_save = tail;
tail += sizeof(__siginfo_rwin_t);
err |= save_rwin_state(wsaved, rwin_save);
err |= __put_user((u64)rwin_save, &sf->rwin_save);
set_thread_wsaved(0);
} else {
err |= __put_user(0, &sf->rwin_save);
}
/* Setup sigaltstack */
err |= __save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
err |= copy_to_user(&sf->mask, sigmask_to_save(), sizeof(sigset_t));
if (!wsaved) {
err |= copy_in_user((u64 __user *)sf,
(u64 __user *)(regs->u_regs[UREG_FP] +
STACK_BIAS),
sizeof(struct reg_window));
} else {
struct reg_window *rp;
rp = ¤t_thread_info()->reg_window[wsaved - 1];
err |= copy_to_user(sf, rp, sizeof(struct reg_window));
}
if (ksig->ka.sa.sa_flags & SA_SIGINFO)
err |= copy_siginfo_to_user(&sf->info, &ksig->info);
else {
err |= __put_user(ksig->sig, &sf->info.si_signo);
err |= __put_user(SI_NOINFO, &sf->info.si_code);
}
if (err)
return err;
/* 3. signal handler back-trampoline and parameters */
regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
regs->u_regs[UREG_I0] = ksig->sig;
regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
/* The sigcontext is passed in this way because of how it
* is defined in GLIBC's /usr/include/bits/sigcontext.h
* for sparc64. It includes the 128 bytes of siginfo_t.
*/
regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
/* 5. signal handler */
regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
regs->tnpc = (regs->tpc + 4);
if (test_thread_flag(TIF_32BIT)) {
regs->tpc &= 0xffffffff;
regs->tnpc &= 0xffffffff;
}
/* 4. return to kernel instructions */
regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
return 0;
}
