[linux.git] / arch / c6x / kernel / signal.c

/*
 *  Port on Texas Instruments TMS320C6x architecture
 *
 *  Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
 *  Author: Aurelien Jacquiot ([email protected])
 *
 *  Updated for 2.6.34: Mark Salter <[email protected]>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/uaccess.h>
#include <linux/syscalls.h>
#include <linux/tracehook.h>

#include <asm/ucontext.h>
#include <asm/cacheflush.h>


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

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

#define RETCODE_SIZE (9 << 2)	/* 9 instructions = 36 bytes */

struct rt_sigframe {
	struct siginfo __user *pinfo;
	void __user *puc;
	struct siginfo info;
	struct ucontext uc;
	unsigned long retcode[RETCODE_SIZE >> 2];
};

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

	/* The access_ok check was done by caller, so use __get_user here */
#define COPY(x)  (err |= __get_user(regs->x, &sc->sc_##x))

	COPY(sp); COPY(a4); COPY(b4); COPY(a6); COPY(b6); COPY(a8); COPY(b8);
	COPY(a0); COPY(a1); COPY(a2); COPY(a3); COPY(a5); COPY(a7); COPY(a9);
	COPY(b0); COPY(b1); COPY(b2); COPY(b3); COPY(b5); COPY(b7); COPY(b9);

	COPY(a16); COPY(a17); COPY(a18); COPY(a19);
	COPY(a20); COPY(a21); COPY(a22); COPY(a23);
	COPY(a24); COPY(a25); COPY(a26); COPY(a27);
	COPY(a28); COPY(a29); COPY(a30); COPY(a31);
	COPY(b16); COPY(b17); COPY(b18); COPY(b19);
	COPY(b20); COPY(b21); COPY(b22); COPY(b23);
	COPY(b24); COPY(b25); COPY(b26); COPY(b27);
	COPY(b28); COPY(b29); COPY(b30); COPY(b31);

	COPY(csr); COPY(pc);

#undef COPY

	return err;
}

asmlinkage int do_rt_sigreturn(struct pt_regs *regs)
{
	struct rt_sigframe __user *frame;
	sigset_t set;

	/*
	 * Since we stacked the signal on a dword boundary,
	 * 'sp' should be dword aligned here.  If it's
	 * not, then the user is trying to mess with us.
	 */
	if (regs->sp & 7)
		goto badframe;

	frame = (struct rt_sigframe __user *) ((unsigned long) regs->sp + 8);

	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))
		goto badframe;

	return regs->a4;

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

static int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
			    unsigned long mask)
{
	int err = 0;

	err |= __put_user(mask, &sc->sc_mask);

	/* The access_ok check was done by caller, so use __put_user here */
#define COPY(x) (err |= __put_user(regs->x, &sc->sc_##x))

	COPY(sp); COPY(a4); COPY(b4); COPY(a6); COPY(b6); COPY(a8); COPY(b8);
	COPY(a0); COPY(a1); COPY(a2); COPY(a3); COPY(a5); COPY(a7); COPY(a9);
	COPY(b0); COPY(b1); COPY(b2); COPY(b3); COPY(b5); COPY(b7); COPY(b9);

	COPY(a16); COPY(a17); COPY(a18); COPY(a19);
	COPY(a20); COPY(a21); COPY(a22); COPY(a23);
	COPY(a24); COPY(a25); COPY(a26); COPY(a27);
	COPY(a28); COPY(a29); COPY(a30); COPY(a31);
	COPY(b16); COPY(b17); COPY(b18); COPY(b19);
	COPY(b20); COPY(b21); COPY(b22); COPY(b23);
	COPY(b24); COPY(b25); COPY(b26); COPY(b27);
	COPY(b28); COPY(b29); COPY(b30); COPY(b31);

	COPY(csr); COPY(pc);

#undef COPY

	return err;
}

static inline void __user *get_sigframe(struct k_sigaction *ka,
					struct pt_regs *regs,
					unsigned long framesize)
{
	unsigned long sp = regs->sp;

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

	/*
	 * No matter what happens, 'sp' must be dword
	 * aligned. Otherwise, nasty things will happen
	 */
	return (void __user *)((sp - framesize) & ~7);
}

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

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

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

	err |= __put_user(&frame->info, &frame->pinfo);
	err |= __put_user(&frame->uc, &frame->puc);
	err |= copy_siginfo_to_user(&frame->info, info);

	/* Clear all the bits of the ucontext we don't use.  */
	err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));

	err |= setup_sigcontext(&frame->uc.uc_mcontext,	regs, set->sig[0]);
	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));

	/* Set up to return from userspace */
	retcode = (unsigned long __user *) &frame->retcode;

	/* The access_ok check was done above, so use __put_user here */
#define COPY(x) (err |= __put_user(x, retcode++))

	COPY(0x0000002AUL | (__NR_rt_sigreturn << 7));
				/* MVK __NR_rt_sigreturn,B0 */
	COPY(0x10000000UL);	/* SWE */
	COPY(0x00006000UL);	/* NOP 4 */
	COPY(0x00006000UL);	/* NOP 4 */
	COPY(0x00006000UL);	/* NOP 4 */
	COPY(0x00006000UL);	/* NOP 4 */
	COPY(0x00006000UL);	/* NOP 4 */
	COPY(0x00006000UL);	/* NOP 4 */
	COPY(0x00006000UL);	/* NOP 4 */

#undef COPY

	if (err)
		goto segv_and_exit;

	flush_icache_range((unsigned long) &frame->retcode,
			   (unsigned long) &frame->retcode + RETCODE_SIZE);

	retcode = (unsigned long __user *) &frame->retcode;

	/* Change user context to branch to signal handler */
	regs->sp = (unsigned long) frame - 8;
	regs->b3 = (unsigned long) retcode;
	regs->pc = (unsigned long) ka->sa.sa_handler;

	/* Give the signal number to the handler */
	regs->a4 = signr;

	/*
	 * For realtime signals we must also set the second and third
	 * arguments for the signal handler.
	 *   -- Peter Maydell <[email protected]> 2000-12-06
	 */
	regs->b4 = (unsigned long)&frame->info;
	regs->a6 = (unsigned long)&frame->uc;

	return 0;

segv_and_exit:
	force_sigsegv(signr, current);
	return -EFAULT;
}

static inline void
handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
{
	switch (regs->a4) {
	case -ERESTARTNOHAND:
		if (!has_handler)
			goto do_restart;
		regs->a4 = -EINTR;
		break;

	case -ERESTARTSYS:
		if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
			regs->a4 = -EINTR;
			break;
		}
	/* fallthrough */
	case -ERESTARTNOINTR:
do_restart:
		regs->a4 = regs->orig_a4;
		regs->pc -= 4;
		break;
	}
}

/*
 * 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 syscall)
{
	int ret;

	/* Are we from a system call? */
	if (syscall) {
		/* If so, check system call restarting.. */
		switch (regs->a4) {
		case -ERESTART_RESTARTBLOCK:
		case -ERESTARTNOHAND:
			regs->a4 = -EINTR;
			break;

		case -ERESTARTSYS:
			if (!(ka->sa.sa_flags & SA_RESTART)) {
				regs->a4 = -EINTR;
				break;
			}

			/* fallthrough */
		case -ERESTARTNOINTR:
			regs->a4 = regs->orig_a4;
			regs->pc -= 4;
		}
	}

	/* Set up the stack frame */
	ret = setup_rt_frame(sig, ka, info, oldset, regs);
	if (ret == 0) {
		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;
}

/*
 * handle a potential signal
 */
static void do_signal(struct pt_regs *regs, int syscall)
{
	struct k_sigaction ka;
	siginfo_t info;
	sigset_t *oldset;
	int signr;

	/* we want the common case to go fast, which is why we may in certain
	 * cases get here from kernel mode */
	if (!user_mode(regs))
		return;

	if (test_thread_flag(TIF_RESTORE_SIGMASK))
		oldset = &current->saved_sigmask;
	else
		oldset = &current->blocked;

	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
	if (signr > 0) {
		if (handle_signal(signr, &info, &ka, oldset,
				  regs, syscall) == 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 TIF_RESTORE_SIGMASK flag */
			if (test_thread_flag(TIF_RESTORE_SIGMASK))
				clear_thread_flag(TIF_RESTORE_SIGMASK);

			tracehook_signal_handler(signr, &info, &ka, regs, 0);
		}

		return;
	}

	/* did we come from a system call? */
	if (syscall) {
		/* restart the system call - no handlers present */
		switch (regs->a4) {
		case -ERESTARTNOHAND:
		case -ERESTARTSYS:
		case -ERESTARTNOINTR:
			regs->a4 = regs->orig_a4;
			regs->pc -= 4;
			break;

		case -ERESTART_RESTARTBLOCK:
			regs->a4 = regs->orig_a4;
			regs->b0 = __NR_restart_syscall;
			regs->pc -= 4;
			break;
		}
	}

	/* if there's no signal to deliver, we just put the saved sigmask
	 * back */
	if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
		clear_thread_flag(TIF_RESTORE_SIGMASK);
		sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
	}
}

/*
 * notification of userspace execution resumption
 * - triggered by current->work.notify_resume
 */
asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags,
				 int syscall)
{
	/* deal with pending signal delivery */
	if (thread_info_flags & ((1 << TIF_SIGPENDING) |
				 (1 << TIF_RESTORE_SIGMASK)))
		do_signal(regs, syscall);

	if (thread_info_flags & (1 << TIF_NOTIFY_RESUME)) {
		clear_thread_flag(TIF_NOTIFY_RESUME);
		tracehook_notify_resume(regs);
		if (current->replacement_session_keyring)
			key_replace_session_keyring();
	}
}
Commit	Line	Data
03a34755 AJ	1	/*
	2	* Port on Texas Instruments TMS320C6x architecture
	3	*
	4	* Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
	5	* Author: Aurelien Jacquiot ([email protected])
	6	*
	7	* Updated for 2.6.34: Mark Salter <[email protected]>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*/
	13
	14	#include <linux/kernel.h>
	15	#include <linux/uaccess.h>
	16	#include <linux/syscalls.h>
	17	#include <linux/tracehook.h>
	18
	19	#include <asm/ucontext.h>
	20	#include <asm/cacheflush.h>
	21
	22
	23	#define _BLOCKABLE (~(sigmask(SIGKILL) \| sigmask(SIGSTOP)))
	24
	25	/*
	26	* Do a signal return, undo the signal stack.
	27	*/
	28
	29	#define RETCODE_SIZE (9 << 2) /* 9 instructions = 36 bytes */
	30
	31	struct rt_sigframe {
	32	struct siginfo __user *pinfo;
	33	void __user *puc;
	34	struct siginfo info;
	35	struct ucontext uc;
	36	unsigned long retcode[RETCODE_SIZE >> 2];
	37	};
	38
	39	static int restore_sigcontext(struct pt_regs *regs,
	40	struct sigcontext __user *sc)
	41	{
	42	int err = 0;
	43
	44	/* The access_ok check was done by caller, so use __get_user here */
	45	#define COPY(x) (err \|= __get_user(regs->x, &sc->sc_##x))
	46
	47	COPY(sp); COPY(a4); COPY(b4); COPY(a6); COPY(b6); COPY(a8); COPY(b8);
	48	COPY(a0); COPY(a1); COPY(a2); COPY(a3); COPY(a5); COPY(a7); COPY(a9);
	49	COPY(b0); COPY(b1); COPY(b2); COPY(b3); COPY(b5); COPY(b7); COPY(b9);
	50
	51	COPY(a16); COPY(a17); COPY(a18); COPY(a19);
	52	COPY(a20); COPY(a21); COPY(a22); COPY(a23);
	53	COPY(a24); COPY(a25); COPY(a26); COPY(a27);
	54	COPY(a28); COPY(a29); COPY(a30); COPY(a31);
	55	COPY(b16); COPY(b17); COPY(b18); COPY(b19);
	56	COPY(b20); COPY(b21); COPY(b22); COPY(b23);
	57	COPY(b24); COPY(b25); COPY(b26); COPY(b27);
	58	COPY(b28); COPY(b29); COPY(b30); COPY(b31);
	59
	60	COPY(csr); COPY(pc);
	61
	62	#undef COPY
	63
	64	return err;
65	}
66
67	asmlinkage int do_rt_sigreturn(struct pt_regs *regs)
68	{
69	struct rt_sigframe __user *frame;
70	sigset_t set;
71
72	/*
73	* Since we stacked the signal on a dword boundary,
74	* 'sp' should be dword aligned here. If it's
75	* not, then the user is trying to mess with us.
76	*/
77	if (regs->sp & 7)
78	goto badframe;
79
80	frame = (struct rt_sigframe __user *) ((unsigned long) regs->sp + 8);
81
82	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
83	goto badframe;
84	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
85	goto badframe;
86
87	sigdelsetmask(&set, ~_BLOCKABLE);
88	spin_lock_irq(&current->sighand->siglock);
89	current->blocked = set;
90	recalc_sigpending();
91	spin_unlock_irq(&current->sighand->siglock);
92
93	if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
94	goto badframe;
95
96	return regs->a4;
97
98	badframe:
99	force_sig(SIGSEGV, current);
100	return 0;
101	}
102
103	static int setup_sigcontext(struct sigcontext __user sc, struct pt_regs regs,
104	unsigned long mask)
105	{
106	int err = 0;
107
108	err \|= __put_user(mask, &sc->sc_mask);
109
110	/* The access_ok check was done by caller, so use __put_user here */
111	#define COPY(x) (err \|= __put_user(regs->x, &sc->sc_##x))
112
113	COPY(sp); COPY(a4); COPY(b4); COPY(a6); COPY(b6); COPY(a8); COPY(b8);
114	COPY(a0); COPY(a1); COPY(a2); COPY(a3); COPY(a5); COPY(a7); COPY(a9);
115	COPY(b0); COPY(b1); COPY(b2); COPY(b3); COPY(b5); COPY(b7); COPY(b9);
116
117	COPY(a16); COPY(a17); COPY(a18); COPY(a19);
118	COPY(a20); COPY(a21); COPY(a22); COPY(a23);
119	COPY(a24); COPY(a25); COPY(a26); COPY(a27);
120	COPY(a28); COPY(a29); COPY(a30); COPY(a31);
121	COPY(b16); COPY(b17); COPY(b18); COPY(b19);
122	COPY(b20); COPY(b21); COPY(b22); COPY(b23);
123	COPY(b24); COPY(b25); COPY(b26); COPY(b27);
124	COPY(b28); COPY(b29); COPY(b30); COPY(b31);
125
126	COPY(csr); COPY(pc);
127
128	#undef COPY
129
130	return err;
131	}
132
133	static inline void __user get_sigframe(struct k_sigaction ka,
134	struct pt_regs *regs,
135	unsigned long framesize)
136	{
137	unsigned long sp = regs->sp;
138
139	/*
140	* This is the X/Open sanctioned signal stack switching.
141	*/
142	if ((ka->sa.sa_flags & SA_ONSTACK) && sas_ss_flags(sp) == 0)
143	sp = current->sas_ss_sp + current->sas_ss_size;
144
145	/*
146	* No matter what happens, 'sp' must be dword
147	* aligned. Otherwise, nasty things will happen
148	*/
149	return (void __user *)((sp - framesize) & ~7);
150	}
151
152	static int setup_rt_frame(int signr, struct k_sigaction ka, siginfo_t info,
153	sigset_t set, struct pt_regs regs)
154	{
155	struct rt_sigframe __user *frame;
156	unsigned long __user *retcode;
157	int err = 0;
158
159	frame = get_sigframe(ka, regs, sizeof(*frame));
160
161	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
162	goto segv_and_exit;
163
164	err \|= __put_user(&frame->info, &frame->pinfo);
165	err \|= __put_user(&frame->uc, &frame->puc);
166	err \|= copy_siginfo_to_user(&frame->info, info);
167
168	/* Clear all the bits of the ucontext we don't use. */
169	err \|= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));
170
171	err \|= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
172	err \|= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
173
174	/* Set up to return from userspace */
175	retcode = (unsigned long __user *) &frame->retcode;
176
177	/* The access_ok check was done above, so use __put_user here */
178	#define COPY(x) (err \|= __put_user(x, retcode++))
179
180	COPY(0x0000002AUL \| (__NR_rt_sigreturn << 7));
181	/* MVK __NR_rt_sigreturn,B0 */
182	COPY(0x10000000UL); /* SWE */
183	COPY(0x00006000UL); /* NOP 4 */
184	COPY(0x00006000UL); /* NOP 4 */
185	COPY(0x00006000UL); /* NOP 4 */
186	COPY(0x00006000UL); /* NOP 4 */
187	COPY(0x00006000UL); /* NOP 4 */
188	COPY(0x00006000UL); /* NOP 4 */
189	COPY(0x00006000UL); /* NOP 4 */
190
191	#undef COPY
192
193	if (err)
194	goto segv_and_exit;
195
196	flush_icache_range((unsigned long) &frame->retcode,
197	(unsigned long) &frame->retcode + RETCODE_SIZE);
198
199	retcode = (unsigned long __user *) &frame->retcode;
200
201	/* Change user context to branch to signal handler */
202	regs->sp = (unsigned long) frame - 8;
203	regs->b3 = (unsigned long) retcode;
204	regs->pc = (unsigned long) ka->sa.sa_handler;
205
206	/* Give the signal number to the handler */
207	regs->a4 = signr;
208
209	/*
210	* For realtime signals we must also set the second and third
211	* arguments for the signal handler.
212	* -- Peter Maydell <[email protected]> 2000-12-06
213	*/
214	regs->b4 = (unsigned long)&frame->info;
215	regs->a6 = (unsigned long)&frame->uc;
216
217	return 0;
218
219	segv_and_exit:
220	force_sigsegv(signr, current);
221	return -EFAULT;
222	}
223
224	static inline void
225	handle_restart(struct pt_regs regs, struct k_sigaction ka, int has_handler)
226	{
227	switch (regs->a4) {
228	case -ERESTARTNOHAND:
229	if (!has_handler)
230	goto do_restart;
231	regs->a4 = -EINTR;
232	break;
233
234	case -ERESTARTSYS:
235	if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
236	regs->a4 = -EINTR;
237	break;
238	}
239	/* fallthrough */
240	case -ERESTARTNOINTR:
241	do_restart:
242	regs->a4 = regs->orig_a4;
243	regs->pc -= 4;
244	break;
245	}
246	}
247
248	/*
249	* handle the actual delivery of a signal to userspace
250	*/
251	static int handle_signal(int sig,
252	siginfo_t info, struct k_sigaction ka,
253	sigset_t oldset, struct pt_regs regs,
254	int syscall)
255	{
256	int ret;
257
258	/* Are we from a system call? */
259	if (syscall) {
260	/* If so, check system call restarting.. */
261	switch (regs->a4) {
262	case -ERESTART_RESTARTBLOCK:
263	case -ERESTARTNOHAND:
264	regs->a4 = -EINTR;
265	break;
266
267	case -ERESTARTSYS:
268	if (!(ka->sa.sa_flags & SA_RESTART)) {
269	regs->a4 = -EINTR;
270	break;
271	}
272
273	/* fallthrough */
274	case -ERESTARTNOINTR:
275	regs->a4 = regs->orig_a4;
276	regs->pc -= 4;
277	}
278	}
279
280	/* Set up the stack frame */
281	ret = setup_rt_frame(sig, ka, info, oldset, regs);
282	if (ret == 0) {
283	spin_lock_irq(&current->sighand->siglock);
284	sigorsets(&current->blocked, &current->blocked,
285	&ka->sa.sa_mask);
286	if (!(ka->sa.sa_flags & SA_NODEFER))
287	sigaddset(&current->blocked, sig);
288	recalc_sigpending();
289	spin_unlock_irq(&current->sighand->siglock);
290	}
291
292	return ret;
293	}
294
295	/*
296	* handle a potential signal
297	*/
298	static void do_signal(struct pt_regs *regs, int syscall)
299	{
300	struct k_sigaction ka;
301	siginfo_t info;
302	sigset_t *oldset;
303	int signr;
304
305	/* we want the common case to go fast, which is why we may in certain
306	* cases get here from kernel mode */
307	if (!user_mode(regs))
308	return;
309
310	if (test_thread_flag(TIF_RESTORE_SIGMASK))
311	oldset = &current->saved_sigmask;
312	else
313	oldset = &current->blocked;
314
315	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
316	if (signr > 0) {
317	if (handle_signal(signr, &info, &ka, oldset,
318	regs, syscall) == 0) {
319	/* a signal was successfully delivered; the saved
320	* sigmask will have been stored in the signal frame,
321	* and will be restored by sigreturn, so we can simply
322	* clear the TIF_RESTORE_SIGMASK flag */
323	if (test_thread_flag(TIF_RESTORE_SIGMASK))
324	clear_thread_flag(TIF_RESTORE_SIGMASK);
325
326	tracehook_signal_handler(signr, &info, &ka, regs, 0);
327	}
328
329	return;
330	}
331
332	/* did we come from a system call? */
333	if (syscall) {
334	/* restart the system call - no handlers present */
335	switch (regs->a4) {
336	case -ERESTARTNOHAND:
337	case -ERESTARTSYS:
338	case -ERESTARTNOINTR:
339	regs->a4 = regs->orig_a4;
340	regs->pc -= 4;
341	break;
342
343	case -ERESTART_RESTARTBLOCK:
344	regs->a4 = regs->orig_a4;
345	regs->b0 = __NR_restart_syscall;
346	regs->pc -= 4;
347	break;
348	}
349	}
350
351	/* if there's no signal to deliver, we just put the saved sigmask
352	* back */
353	if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
354	clear_thread_flag(TIF_RESTORE_SIGMASK);
355	sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
356	}
357	}
358
359	/*
360	* notification of userspace execution resumption
361	* - triggered by current->work.notify_resume
362	*/
363	asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags,
364	int syscall)
365	{
366	/* deal with pending signal delivery */
367	if (thread_info_flags & ((1 << TIF_SIGPENDING) \|
368	(1 << TIF_RESTORE_SIGMASK)))
369	do_signal(regs, syscall);
370
371	if (thread_info_flags & (1 << TIF_NOTIFY_RESUME)) {
372	clear_thread_flag(TIF_NOTIFY_RESUME);
373	tracehook_notify_resume(regs);
374	if (current->replacement_session_keyring)
375	key_replace_session_keyring();
376	}
377	}