[net-next-2.6.git] / arch / tile / kernel / signal.c

/*
 * Copyright (C) 1991, 1992  Linus Torvalds
 * Copyright 2010 Tilera Corporation. All Rights Reserved.
 *
 *   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, version 2.
 *
 *   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, GOOD TITLE or
 *   NON INFRINGEMENT.  See the GNU General Public License for
 *   more details.
 */

#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/errno.h>
#include <linux/wait.h>
#include <linux/unistd.h>
#include <linux/stddef.h>
#include <linux/personality.h>
#include <linux/suspend.h>
#include <linux/ptrace.h>
#include <linux/elf.h>
#include <linux/compat.h>
#include <linux/syscalls.h>
#include <linux/uaccess.h>
#include <asm/processor.h>
#include <asm/ucontext.h>
#include <asm/sigframe.h>
#include <arch/interrupts.h>

#define DEBUG_SIG 0

#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))


/* Caller before callee in this file; other callee is in assembler */
void do_signal(struct pt_regs *regs);

long _sys_sigaltstack(const stack_t __user *uss,
                      stack_t __user *uoss, struct pt_regs *regs)
{
	return do_sigaltstack(uss, uoss, regs->sp);
}


/*
 * Do a signal return; undo the signal stack.
 */

int restore_sigcontext(struct pt_regs *regs,
		       struct sigcontext __user *sc, long *pr0)
{
	int err = 0;
	int i;

	/* Always make any pending restarted system calls return -EINTR */
	current_thread_info()->restart_block.fn = do_no_restart_syscall;

	for (i = 0; i < sizeof(struct pt_regs)/sizeof(long); ++i)
		err |= __get_user(((long *)regs)[i],
				  &((long *)(&sc->regs))[i]);

	regs->faultnum = INT_SWINT_1_SIGRETURN;

	err |= __get_user(*pr0, &sc->regs.regs[0]);
	return err;
}

int _sys_rt_sigreturn(struct pt_regs *regs)
{
	struct rt_sigframe __user *frame =
		(struct rt_sigframe __user *)(regs->sp);
	sigset_t set;
	long r0;

	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
		goto badframe;
	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
		goto badframe;

	sigdelsetmask(&set, ~_BLOCKABLE);
	spin_lock_irq(&current->sighand->siglock);
	current->blocked = set;
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0))
		goto badframe;

	if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT)
		goto badframe;

	return r0;

badframe:
	force_sig(SIGSEGV, current);
	return 0;
}

/*
 * Set up a signal frame.
 */

int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs)
{
	int i, err = 0;

	for (i = 0; i < sizeof(struct pt_regs)/sizeof(long); ++i)
		err |= __put_user(((long *)regs)[i],
				  &((long *)(&sc->regs))[i]);

	return err;
}

/*
 * Determine which stack to use..
 */
static inline void __user *get_sigframe(struct k_sigaction *ka,
					struct pt_regs *regs,
					size_t frame_size)
{
	unsigned long sp;

	/* Default to using normal stack */
	sp = regs->sp;

	/*
	 * If we are on the alternate signal stack and would overflow
	 * it, don't.  Return an always-bogus address instead so we
	 * will die with SIGSEGV.
	 */
	if (on_sig_stack(sp) && !likely(on_sig_stack(sp - frame_size)))
		return (void __user *) -1L;

	/* This is the X/Open sanctioned signal stack switching.  */
	if (ka->sa.sa_flags & SA_ONSTACK) {
		if (sas_ss_flags(sp) == 0)
			sp = current->sas_ss_sp + current->sas_ss_size;
	}

	sp -= frame_size;
	/*
	 * Align the stack pointer according to the TILE ABI,
	 * i.e. so that on function entry (sp & 15) == 0.
	 */
	sp &= -16UL;
	return (void __user *) sp;
}

static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
			   sigset_t *set, struct pt_regs *regs)
{
	unsigned long restorer;
	struct rt_sigframe __user *frame;
	int err = 0;
	int usig;

	frame = get_sigframe(ka, regs, sizeof(*frame));

	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
		goto give_sigsegv;

	usig = current_thread_info()->exec_domain
		&& current_thread_info()->exec_domain->signal_invmap
		&& sig < 32
		? current_thread_info()->exec_domain->signal_invmap[sig]
		: sig;

	/* Always write at least the signal number for the stack backtracer. */
	if (ka->sa.sa_flags & SA_SIGINFO) {
		/* At sigreturn time, restore the callee-save registers too. */
		err |= copy_siginfo_to_user(&frame->info, info);
		regs->flags |= PT_FLAGS_RESTORE_REGS;
	} else {
		err |= __put_user(info->si_signo, &frame->info.si_signo);
	}

	/* Create the ucontext.  */
	err |= __clear_user(&frame->save_area, sizeof(frame->save_area));
	err |= __put_user(0, &frame->uc.uc_flags);
	err |= __put_user(0, &frame->uc.uc_link);
	err |= __put_user((void *)(current->sas_ss_sp),
			  &frame->uc.uc_stack.ss_sp);
	err |= __put_user(sas_ss_flags(regs->sp),
			  &frame->uc.uc_stack.ss_flags);
	err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
	err |= setup_sigcontext(&frame->uc.uc_mcontext, regs);
	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
	if (err)
		goto give_sigsegv;

	restorer = VDSO_BASE;
	if (ka->sa.sa_flags & SA_RESTORER)
		restorer = (unsigned long) ka->sa.sa_restorer;

	/*
	 * Set up registers for signal handler.
	 * Registers that we don't modify keep the value they had from
	 * user-space at the time we took the signal.
	 */
	regs->pc = (unsigned long) ka->sa.sa_handler;
	regs->ex1 = PL_ICS_EX1(USER_PL, 1); /* set crit sec in handler */
	regs->sp = (unsigned long) frame;
	regs->lr = restorer;
	regs->regs[0] = (unsigned long) usig;

	if (ka->sa.sa_flags & SA_SIGINFO) {
		/* Need extra arguments, so mark to restore caller-saves. */
		regs->regs[1] = (unsigned long) &frame->info;
		regs->regs[2] = (unsigned long) &frame->uc;
		regs->flags |= PT_FLAGS_CALLER_SAVES;
	}

	/*
	 * Notify any tracer that was single-stepping it.
	 * The tracer may want to single-step inside the
	 * handler too.
	 */
	if (test_thread_flag(TIF_SINGLESTEP))
		ptrace_notify(SIGTRAP);

	return 0;

give_sigsegv:
	force_sigsegv(sig, current);
	return -EFAULT;
}

/*
 * OK, we're invoking a handler
 */

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.
		 */
		spin_lock_irq(&current->sighand->siglock);
		sigorsets(&current->blocked,
			  &current->blocked, &ka->sa.sa_mask);
		if (!(ka->sa.sa_flags & SA_NODEFER))
			sigaddset(&current->blocked, sig);
		recalc_sigpending();
		spin_unlock_irq(&current->sighand->siglock);
	}

	return ret;
}

/*
 * 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.
 */
void do_signal(struct pt_regs *regs)
{
	siginfo_t info;
	int signr;
	struct k_sigaction ka;
	sigset_t *oldset;

	/*
	 * i386 will check if we're coming from kernel mode and bail out
	 * here.  In my experience this just turns weird crashes into
	 * weird spin-hangs.  But if we find a case where this seems
	 * helpful, we can reinstate the check on "!user_mode(regs)".
	 */

	if (current_thread_info()->status & TS_RESTORE_SIGMASK)
		oldset = &current->saved_sigmask;
	else
		oldset = &current->blocked;

	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
	if (signr > 0) {
		/* Whee! Actually deliver the signal.  */
		if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
			/*
			 * A signal was successfully delivered; the saved
			 * sigmask will have been stored in the signal frame,
			 * and will be restored by sigreturn, so we can simply
			 * clear the TS_RESTORE_SIGMASK flag.
			 */
			current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
		}

		return;
	}

	/* Did we come from a system call? */
	if (regs->faultnum == INT_SWINT_1) {
		/* Restart the system call - no handlers present */
		switch (regs->regs[0]) {
		case -ERESTARTNOHAND:
		case -ERESTARTSYS:
		case -ERESTARTNOINTR:
			regs->flags |= PT_FLAGS_CALLER_SAVES;
			regs->regs[0] = regs->orig_r0;
			regs->pc -= 8;
			break;

		case -ERESTART_RESTARTBLOCK:
			regs->flags |= PT_FLAGS_CALLER_SAVES;
			regs->regs[TREG_SYSCALL_NR] = __NR_restart_syscall;
			regs->pc -= 8;
			break;
		}
	}

	/* If there's no signal to deliver, just put the saved sigmask back. */
	if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
		current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
		sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
	}
}
Commit	Line	Data
867e359b CM	1	/*
	2	* Copyright (C) 1991, 1992 Linus Torvalds
	3	* Copyright 2010 Tilera Corporation. All Rights Reserved.
	4	*
	5	* This program is free software; you can redistribute it and/or
	6	* modify it under the terms of the GNU General Public License
	7	* as published by the Free Software Foundation, version 2.
	8	*
	9	* This program is distributed in the hope that it will be useful, but
	10	* WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
	12	* NON INFRINGEMENT. See the GNU General Public License for
	13	* more details.
	14	*/
	15
	16	#include <linux/sched.h>
	17	#include <linux/mm.h>
	18	#include <linux/smp.h>
	19	#include <linux/smp_lock.h>
	20	#include <linux/kernel.h>
	21	#include <linux/signal.h>
	22	#include <linux/errno.h>
	23	#include <linux/wait.h>
	24	#include <linux/unistd.h>
	25	#include <linux/stddef.h>
	26	#include <linux/personality.h>
	27	#include <linux/suspend.h>
	28	#include <linux/ptrace.h>
	29	#include <linux/elf.h>
	30	#include <linux/compat.h>
	31	#include <linux/syscalls.h>
	32	#include <linux/uaccess.h>
	33	#include <asm/processor.h>
	34	#include <asm/ucontext.h>
	35	#include <asm/sigframe.h>
	36	#include <arch/interrupts.h>
	37
	38	#define DEBUG_SIG 0
	39
	40	#define _BLOCKABLE (~(sigmask(SIGKILL) \| sigmask(SIGSTOP)))
	41
	42
	43	/* Caller before callee in this file; other callee is in assembler */
	44	void do_signal(struct pt_regs *regs);
	45
139ef32b CM	46	long _sys_sigaltstack(const stack_t __user *uss,
139ef32b CM	47	stack_t __user uoss, struct pt_regs regs)
867e359b CM	48	{
	49	return do_sigaltstack(uss, uoss, regs->sp);
	50	}
	51
	52
	53	/*
	54	* Do a signal return; undo the signal stack.
	55	*/
	56
	57	int restore_sigcontext(struct pt_regs *regs,
	58	struct sigcontext __user sc, long pr0)
	59	{
	60	int err = 0;
	61	int i;
	62
	63	/* Always make any pending restarted system calls return -EINTR */
	64	current_thread_info()->restart_block.fn = do_no_restart_syscall;
	65
	66	for (i = 0; i < sizeof(struct pt_regs)/sizeof(long); ++i)
	67	err \|= __get_user(((long *)regs)[i],
	68	&((long *)(&sc->regs))[i]);
	69
	70	regs->faultnum = INT_SWINT_1_SIGRETURN;
	71
	72	err \|= __get_user(*pr0, &sc->regs.regs[0]);
	73	return err;
	74	}
	75
	76	int _sys_rt_sigreturn(struct pt_regs *regs)
	77	{
	78	struct rt_sigframe __user *frame =
	79	(struct rt_sigframe __user *)(regs->sp);
	80	sigset_t set;
	81	long r0;
	82
	83	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	84	goto badframe;
	85	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
	86	goto badframe;
	87
	88	sigdelsetmask(&set, ~_BLOCKABLE);
	89	spin_lock_irq(&current->sighand->siglock);
	90	current->blocked = set;
	91	recalc_sigpending();
	92	spin_unlock_irq(&current->sighand->siglock);
	93
	94	if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0))
	95	goto badframe;
	96
	97	if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT)
	98	goto badframe;
	99
	100	return r0;
	101
	102	badframe:
	103	force_sig(SIGSEGV, current);
	104	return 0;
	105	}
	106
	107	/*
	108	* Set up a signal frame.
	109	*/
	110
	111	int setup_sigcontext(struct sigcontext __user sc, struct pt_regs regs)
112	{
113	int i, err = 0;
114
115	for (i = 0; i < sizeof(struct pt_regs)/sizeof(long); ++i)
116	err \|= __put_user(((long *)regs)[i],
117	&((long *)(&sc->regs))[i]);
118
119	return err;
120	}
121
122	/*
123	* Determine which stack to use..
124	*/
125	static inline void __user get_sigframe(struct k_sigaction ka,
126	struct pt_regs *regs,
127	size_t frame_size)
128	{
129	unsigned long sp;
130
131	/* Default to using normal stack */
132	sp = regs->sp;
133
134	/*
135	* If we are on the alternate signal stack and would overflow
136	* it, don't. Return an always-bogus address instead so we
137	* will die with SIGSEGV.
138	*/
139	if (on_sig_stack(sp) && !likely(on_sig_stack(sp - frame_size)))
140	return (void __user *) -1L;
141
142	/* This is the X/Open sanctioned signal stack switching. */
143	if (ka->sa.sa_flags & SA_ONSTACK) {
144	if (sas_ss_flags(sp) == 0)
145	sp = current->sas_ss_sp + current->sas_ss_size;
146	}
147
148	sp -= frame_size;
149	/*
150	* Align the stack pointer according to the TILE ABI,
151	* i.e. so that on function entry (sp & 15) == 0.
152	*/
153	sp &= -16UL;
154	return (void __user *) sp;
155	}
156
157	static int setup_rt_frame(int sig, struct k_sigaction ka, siginfo_t info,
158	sigset_t set, struct pt_regs regs)
159	{
160	unsigned long restorer;
161	struct rt_sigframe __user *frame;
162	int err = 0;
163	int usig;
164
165	frame = get_sigframe(ka, regs, sizeof(*frame));
166
167	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
168	goto give_sigsegv;
169
170	usig = current_thread_info()->exec_domain
171	&& current_thread_info()->exec_domain->signal_invmap
172	&& sig < 32
173	? current_thread_info()->exec_domain->signal_invmap[sig]
174	: sig;
175
176	/* Always write at least the signal number for the stack backtracer. */
177	if (ka->sa.sa_flags & SA_SIGINFO) {
178	/* At sigreturn time, restore the callee-save registers too. */
179	err \|= copy_siginfo_to_user(&frame->info, info);
180	regs->flags \|= PT_FLAGS_RESTORE_REGS;
181	} else {
182	err \|= __put_user(info->si_signo, &frame->info.si_signo);
183	}
184
185	/* Create the ucontext. */
186	err \|= __clear_user(&frame->save_area, sizeof(frame->save_area));
187	err \|= __put_user(0, &frame->uc.uc_flags);
188	err \|= __put_user(0, &frame->uc.uc_link);
189	err \|= __put_user((void *)(current->sas_ss_sp),
190	&frame->uc.uc_stack.ss_sp);
191	err \|= __put_user(sas_ss_flags(regs->sp),
192	&frame->uc.uc_stack.ss_flags);
193	err \|= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
194	err \|= setup_sigcontext(&frame->uc.uc_mcontext, regs);
195	err \|= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
196	if (err)
197	goto give_sigsegv;
198
199	restorer = VDSO_BASE;
200	if (ka->sa.sa_flags & SA_RESTORER)
201	restorer = (unsigned long) ka->sa.sa_restorer;
202
203	/*
204	* Set up registers for signal handler.
205	* Registers that we don't modify keep the value they had from
206	* user-space at the time we took the signal.
207	*/
208	regs->pc = (unsigned long) ka->sa.sa_handler;
209	regs->ex1 = PL_ICS_EX1(USER_PL, 1); /* set crit sec in handler */
210	regs->sp = (unsigned long) frame;
211	regs->lr = restorer;
212	regs->regs[0] = (unsigned long) usig;
213
214	if (ka->sa.sa_flags & SA_SIGINFO) {
215	/* Need extra arguments, so mark to restore caller-saves. */
216	regs->regs[1] = (unsigned long) &frame->info;
217	regs->regs[2] = (unsigned long) &frame->uc;
218	regs->flags \|= PT_FLAGS_CALLER_SAVES;
219	}
220
221	/*
222	* Notify any tracer that was single-stepping it.
223	* The tracer may want to single-step inside the
224	* handler too.
225	*/
226	if (test_thread_flag(TIF_SINGLESTEP))
227	ptrace_notify(SIGTRAP);
228
229	return 0;
230
231	give_sigsegv:
232	force_sigsegv(sig, current);
233	return -EFAULT;
234	}
235
236	/*
237	* OK, we're invoking a handler
238	*/
239
240	static int handle_signal(unsigned long sig, siginfo_t *info,
241	struct k_sigaction ka, sigset_t oldset,
242	struct pt_regs *regs)
243	{
244	int ret;
245
246
247	/* Are we from a system call? */
248	if (regs->faultnum == INT_SWINT_1) {
249	/* If so, check system call restarting.. */
250	switch (regs->regs[0]) {
251	case -ERESTART_RESTARTBLOCK:
252	case -ERESTARTNOHAND:
253	regs->regs[0] = -EINTR;
254	break;
255
256	case -ERESTARTSYS:
257	if (!(ka->sa.sa_flags & SA_RESTART)) {
258	regs->regs[0] = -EINTR;
259	break;
260	}
261	/* fallthrough */
262	case -ERESTARTNOINTR:
263	/* Reload caller-saves to restore r0..r5 and r10. */
264	regs->flags \|= PT_FLAGS_CALLER_SAVES;
265	regs->regs[0] = regs->orig_r0;
266	regs->pc -= 8;
267	}
268	}
269
270	/* Set up the stack frame */
271	#ifdef CONFIG_COMPAT
272	if (is_compat_task())
273	ret = compat_setup_rt_frame(sig, ka, info, oldset, regs);
274	else
275	#endif
276	ret = setup_rt_frame(sig, ka, info, oldset, regs);
277	if (ret == 0) {
278	/* This code is only called from system calls or from
279	* the work_pending path in the return-to-user code, and
280	* either way we can re-enable interrupts unconditionally.
281	*/
282	spin_lock_irq(&current->sighand->siglock);
283	sigorsets(&current->blocked,
284	&current->blocked, &ka->sa.sa_mask);
285	if (!(ka->sa.sa_flags & SA_NODEFER))
286	sigaddset(&current->blocked, sig);
287	recalc_sigpending();
288	spin_unlock_irq(&current->sighand->siglock);
289	}
290
291	return ret;
292	}
293
294	/*
295	* Note that 'init' is a special process: it doesn't get signals it doesn't
296	* want to handle. Thus you cannot kill init even with a SIGKILL even by
297	* mistake.
298	*/
299	void do_signal(struct pt_regs *regs)
300	{
301	siginfo_t info;
302	int signr;
303	struct k_sigaction ka;
304	sigset_t *oldset;
305
306	/*
307	* i386 will check if we're coming from kernel mode and bail out
308	* here. In my experience this just turns weird crashes into
309	* weird spin-hangs. But if we find a case where this seems
310	* helpful, we can reinstate the check on "!user_mode(regs)".
311	*/
312
313	if (current_thread_info()->status & TS_RESTORE_SIGMASK)
314	oldset = &current->saved_sigmask;
315	else
316	oldset = &current->blocked;
317
318	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
319	if (signr > 0) {
320	/* Whee! Actually deliver the signal. */
321	if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
322	/*
323	* A signal was successfully delivered; the saved
324	* sigmask will have been stored in the signal frame,
325	* and will be restored by sigreturn, so we can simply
326	* clear the TS_RESTORE_SIGMASK flag.
327	*/
328	current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
329	}
330
331	return;
332	}
333
334	/* Did we come from a system call? */
335	if (regs->faultnum == INT_SWINT_1) {
336	/* Restart the system call - no handlers present */
337	switch (regs->regs[0]) {
338	case -ERESTARTNOHAND:
339	case -ERESTARTSYS:
340	case -ERESTARTNOINTR:
341	regs->flags \|= PT_FLAGS_CALLER_SAVES;
342	regs->regs[0] = regs->orig_r0;
343	regs->pc -= 8;
344	break;
345
346	case -ERESTART_RESTARTBLOCK:
347	regs->flags \|= PT_FLAGS_CALLER_SAVES;
348	regs->regs[TREG_SYSCALL_NR] = __NR_restart_syscall;
349	regs->pc -= 8;
350	break;
351	}
352	}
353
354	/* If there's no signal to deliver, just put the saved sigmask back. */
355	if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
356	current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
357	sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
358	}
359	}