[deliverable/linux.git] / arch / microblaze / kernel / signal.c

/*
 * Signal handling
 *
 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
 * Copyright (C) 2008-2009 PetaLogix
 * Copyright (C) 2003,2004 John Williams <jwilliams@itee.uq.edu.au>
 * Copyright (C) 2001 NEC Corporation
 * Copyright (C) 2001 Miles Bader <miles@gnu.org>
 * Copyright (C) 1999,2000 Niibe Yutaka & Kaz Kojima
 * Copyright (C) 1991,1992 Linus Torvalds
 *
 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
 *
 * This file was was derived from the sh version, arch/sh/kernel/signal.c
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License. See the file COPYING in the main directory of this
 * archive for more details.
 */

#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/errno.h>
#include <linux/wait.h>
#include <linux/ptrace.h>
#include <linux/unistd.h>
#include <linux/stddef.h>
#include <linux/personality.h>
#include <linux/percpu.h>
#include <linux/linkage.h>
#include <linux/tracehook.h>
#include <asm/entry.h>
#include <asm/ucontext.h>
#include <linux/uaccess.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <linux/syscalls.h>
#include <asm/cacheflush.h>
#include <asm/syscalls.h>

/*
 * Do a signal return; undo the signal stack.
 */
struct sigframe {
	struct sigcontext sc;
	unsigned long extramask[_NSIG_WORDS-1];
	unsigned long tramp[2];	/* signal trampoline */
};

struct rt_sigframe {
	struct siginfo info;
	struct ucontext uc;
	unsigned long tramp[2];	/* signal trampoline */
};

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

#define COPY(x)		{err |= __get_user(regs->x, &sc->regs.x); }
	COPY(r0);
	COPY(r1);
	COPY(r2);	COPY(r3);	COPY(r4);	COPY(r5);
	COPY(r6);	COPY(r7);	COPY(r8);	COPY(r9);
	COPY(r10);	COPY(r11);	COPY(r12);	COPY(r13);
	COPY(r14);	COPY(r15);	COPY(r16);	COPY(r17);
	COPY(r18);	COPY(r19);	COPY(r20);	COPY(r21);
	COPY(r22);	COPY(r23);	COPY(r24);	COPY(r25);
	COPY(r26);	COPY(r27);	COPY(r28);	COPY(r29);
	COPY(r30);	COPY(r31);
	COPY(pc);	COPY(ear);	COPY(esr);	COPY(fsr);
#undef COPY

	*rval_p = regs->r3;

	return err;
}

asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
{
	struct rt_sigframe __user *frame =
		(struct rt_sigframe __user *)(regs->r1);

	sigset_t set;
	int rval;

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

	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
		goto badframe;

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

	set_current_blocked(&set);

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

	if (restore_altstack(&frame->uc.uc_stack))
		goto badframe;

	return rval;

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

/*
 * Set up a signal frame.
 */

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

#define COPY(x)		{err |= __put_user(regs->x, &sc->regs.x); }
	COPY(r0);
	COPY(r1);
	COPY(r2);	COPY(r3);	COPY(r4);	COPY(r5);
	COPY(r6);	COPY(r7);	COPY(r8);	COPY(r9);
	COPY(r10);	COPY(r11);	COPY(r12);	COPY(r13);
	COPY(r14);	COPY(r15);	COPY(r16);	COPY(r17);
	COPY(r18);	COPY(r19);	COPY(r20);	COPY(r21);
	COPY(r22);	COPY(r23);	COPY(r24);	COPY(r25);
	COPY(r26);	COPY(r27);	COPY(r28);	COPY(r29);
	COPY(r30);	COPY(r31);
	COPY(pc);	COPY(ear);	COPY(esr);	COPY(fsr);
#undef COPY

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

	return err;
}

/*
 * Determine which stack to use..
 */
static inline void __user *
get_sigframe(struct ksignal *ksig, struct pt_regs *regs, size_t frame_size)
{
	/* Default to using normal stack */
	unsigned long sp = sigsp(regs->r1, ksig);

	return (void __user *)((sp - frame_size) & -8UL);
}

static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
			  struct pt_regs *regs)
{
	struct rt_sigframe __user *frame;
	int err = 0, sig = ksig->sig;
	unsigned long signal;
	unsigned long address = 0;
#ifdef CONFIG_MMU
	pmd_t *pmdp;
	pte_t *ptep;
#endif

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

	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
		return -EFAULT;

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

	if (ksig->ka.sa.sa_flags & SA_SIGINFO)
		err |= copy_siginfo_to_user(&frame->info, &ksig->info);

	/* Create the ucontext. */
	err |= __put_user(0, &frame->uc.uc_flags);
	err |= __put_user(NULL, &frame->uc.uc_link);
	err |= __save_altstack(&frame->uc.uc_stack, regs->r1);
	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. If provided, use a stub
	 already in userspace. */
	/* minus 8 is offset to cater for "rtsd r15,8" */
	/* addi r12, r0, __NR_sigreturn */
	err |= __put_user(0x31800000 | __NR_rt_sigreturn ,
			frame->tramp + 0);
	/* brki r14, 0x8 */
	err |= __put_user(0xb9cc0008, frame->tramp + 1);

	/* Return from sighandler will jump to the tramp.
	 Negative 8 offset because return is rtsd r15, 8 */
	regs->r15 = ((unsigned long)frame->tramp)-8;

	address = ((unsigned long)frame->tramp);
#ifdef CONFIG_MMU
	pmdp = pmd_offset(pud_offset(
			pgd_offset(current->mm, address),
					address), address);

	preempt_disable();
	ptep = pte_offset_map(pmdp, address);
	if (pte_present(*ptep)) {
		address = (unsigned long) page_address(pte_page(*ptep));
		/* MS: I need add offset in page */
		address += ((unsigned long)frame->tramp) & ~PAGE_MASK;
		/* MS address is virtual */
		address = __virt_to_phys(address);
		invalidate_icache_range(address, address + 8);
		flush_dcache_range(address, address + 8);
	}
	pte_unmap(ptep);
	preempt_enable();
#else
	flush_icache_range(address, address + 8);
	flush_dcache_range(address, address + 8);
#endif
	if (err)
		return -EFAULT;

	/* Set up registers for signal handler */
	regs->r1 = (unsigned long) frame;

	/* Signal handler args: */
	regs->r5 = signal; /* arg 0: signum */
	regs->r6 = (unsigned long) &frame->info; /* arg 1: siginfo */
	regs->r7 = (unsigned long) &frame->uc; /* arg2: ucontext */
	/* Offset to handle microblaze rtid r14, 0 */
	regs->pc = (unsigned long)ksig->ka.sa.sa_handler;

	set_fs(USER_DS);

#ifdef DEBUG_SIG
	pr_info("SIG deliver (%s:%d): sp=%p pc=%08lx\n",
		current->comm, current->pid, frame, regs->pc);
#endif

	return 0;
}

/* Handle restarting system calls */
static inline void
handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
{
	switch (regs->r3) {
	case -ERESTART_RESTARTBLOCK:
	case -ERESTARTNOHAND:
		if (!has_handler)
			goto do_restart;
		regs->r3 = -EINTR;
		break;
	case -ERESTARTSYS:
		if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
			regs->r3 = -EINTR;
			break;
	}
	/* fallthrough */
	case -ERESTARTNOINTR:
do_restart:
		/* offset of 4 bytes to re-execute trap (brki) instruction */
		regs->pc -= 4;
		break;
	}
}

/*
 * 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 */
	ret = setup_rt_frame(ksig, oldset, regs);

	signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
}

/*
 * 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.
 *
 * Note that we go through the signals twice: once to check the signals that
 * the kernel can handle, and then we build all the user-level signal handling
 * stack-frames in one go after that.
 */
static void do_signal(struct pt_regs *regs, int in_syscall)
{
	struct ksignal ksig;

#ifdef DEBUG_SIG
	pr_info("do signal: %p %d\n", regs, in_syscall);
	pr_info("do signal2: %lx %lx %ld [%lx]\n", regs->pc, regs->r1,
			regs->r12, current_thread_info()->flags);
#endif

	if (get_signal(&ksig)) {
		/* Whee! Actually deliver the signal. */
		if (in_syscall)
			handle_restart(regs, &ksig.ka, 1);
		handle_signal(&ksig, regs);
		return;
	}

	if (in_syscall)
		handle_restart(regs, NULL, 0);

	/*
	 * If there's no signal to deliver, we just put the saved sigmask
	 * back.
	 */
	restore_saved_sigmask();
}

asmlinkage void do_notify_resume(struct pt_regs *regs, int in_syscall)
{
	if (test_thread_flag(TIF_SIGPENDING))
		do_signal(regs, in_syscall);

	if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME))
		tracehook_notify_resume(regs);
}
Commit	Line	Data
2148daa9 MS	1	/*
	2	* Signal handling
	3	*
	4	* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
	5	* Copyright (C) 2008-2009 PetaLogix
	6	* Copyright (C) 2003,2004 John Williams <jwilliams@itee.uq.edu.au>
	7	* Copyright (C) 2001 NEC Corporation
	8	* Copyright (C) 2001 Miles Bader <miles@gnu.org>
	9	* Copyright (C) 1999,2000 Niibe Yutaka & Kaz Kojima
	10	* Copyright (C) 1991,1992 Linus Torvalds
	11	*
	12	* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
	13	*
	14	* This file was was derived from the sh version, arch/sh/kernel/signal.c
	15	*
	16	* This file is subject to the terms and conditions of the GNU General
	17	* Public License. See the file COPYING in the main directory of this
	18	* archive for more details.
	19	*/
	20
	21	#include <linux/sched.h>
	22	#include <linux/mm.h>
	23	#include <linux/smp.h>
2148daa9 MS	24	#include <linux/kernel.h>
	25	#include <linux/signal.h>
	26	#include <linux/errno.h>
	27	#include <linux/wait.h>
	28	#include <linux/ptrace.h>
	29	#include <linux/unistd.h>
	30	#include <linux/stddef.h>
	31	#include <linux/personality.h>
	32	#include <linux/percpu.h>
	33	#include <linux/linkage.h>
969a9616	34	#include <linux/tracehook.h>
2148daa9 MS	35	#include <asm/entry.h>
	36	#include <asm/ucontext.h>
	37	#include <linux/uaccess.h>
	38	#include <asm/pgtable.h>
	39	#include <asm/pgalloc.h>
2148daa9 MS	40	#include <linux/syscalls.h>
	41	#include <asm/cacheflush.h>
	42	#include <asm/syscalls.h>
	43
2148daa9 MS	44	/*
	45	* Do a signal return; undo the signal stack.
	46	*/
2148daa9 MS	47	struct sigframe {
	48	struct sigcontext sc;
	49	unsigned long extramask[_NSIG_WORDS-1];
	50	unsigned long tramp[2]; /* signal trampoline */
	51	};
	52
	53	struct rt_sigframe {
	54	struct siginfo info;
	55	struct ucontext uc;
	56	unsigned long tramp[2]; /* signal trampoline */
	57	};
	58
353b431b AB	59	static int restore_sigcontext(struct pt_regs *regs,
353b431b AB	60	struct sigcontext __user sc, int rval_p)
2148daa9 MS	61	{
	62	unsigned int err = 0;
	63
	64	#define COPY(x) {err \|= __get_user(regs->x, &sc->regs.x); }
	65	COPY(r0);
	66	COPY(r1);
	67	COPY(r2); COPY(r3); COPY(r4); COPY(r5);
	68	COPY(r6); COPY(r7); COPY(r8); COPY(r9);
	69	COPY(r10); COPY(r11); COPY(r12); COPY(r13);
	70	COPY(r14); COPY(r15); COPY(r16); COPY(r17);
	71	COPY(r18); COPY(r19); COPY(r20); COPY(r21);
	72	COPY(r22); COPY(r23); COPY(r24); COPY(r25);
	73	COPY(r26); COPY(r27); COPY(r28); COPY(r29);
	74	COPY(r30); COPY(r31);
	75	COPY(pc); COPY(ear); COPY(esr); COPY(fsr);
	76	#undef COPY
	77
	78	*rval_p = regs->r3;
	79
	80	return err;
	81	}
	82
3183e068	83	asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
2148daa9	84	{
353b431b	85	struct rt_sigframe __user *frame =
6e83557c	86	(struct rt_sigframe __user *)(regs->r1);
2921e2bd	87
2148daa9	88	sigset_t set;
2148daa9 MS	89	int rval;
2148daa9 MS	90
58e4257b	91	/* Always make any pending restarted system calls return -EINTR */
f56141e3	92	current->restart_block.fn = do_no_restart_syscall;
58e4257b	93
2148daa9 MS	94	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	95	goto badframe;
	96
	97	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
	98	goto badframe;
	99
60c59751	100	set_current_blocked(&set);
2148daa9 MS	101
	102	if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &rval))
	103	goto badframe;
	104
4a9d32d3	105	if (restore_altstack(&frame->uc.uc_stack))
353b431b	106	goto badframe;
2148daa9 MS	107
	108	return rval;
	109
	110	badframe:
	111	force_sig(SIGSEGV, current);
	112	return 0;
	113	}
	114
	115	/*
	116	* Set up a signal frame.
	117	*/
	118
	119	static int
353b431b	120	setup_sigcontext(struct sigcontext __user sc, struct pt_regs regs,
2148daa9 MS	121	unsigned long mask)
	122	{
	123	int err = 0;
	124
	125	#define COPY(x) {err \|= __put_user(regs->x, &sc->regs.x); }
	126	COPY(r0);
	127	COPY(r1);
	128	COPY(r2); COPY(r3); COPY(r4); COPY(r5);
	129	COPY(r6); COPY(r7); COPY(r8); COPY(r9);
	130	COPY(r10); COPY(r11); COPY(r12); COPY(r13);
	131	COPY(r14); COPY(r15); COPY(r16); COPY(r17);
	132	COPY(r18); COPY(r19); COPY(r20); COPY(r21);
	133	COPY(r22); COPY(r23); COPY(r24); COPY(r25);
	134	COPY(r26); COPY(r27); COPY(r28); COPY(r29);
	135	COPY(r30); COPY(r31);
	136	COPY(pc); COPY(ear); COPY(esr); COPY(fsr);
	137	#undef COPY
	138
	139	err \|= __put_user(mask, &sc->oldmask);
	140
	141	return err;
	142	}
	143
	144	/*
	145	* Determine which stack to use..
	146	*/
353b431b	147	static inline void __user *
c001cd21	148	get_sigframe(struct ksignal ksig, struct pt_regs regs, size_t frame_size)
2148daa9 MS	149	{
2148daa9 MS	150	/* Default to using normal stack */
c001cd21	151	unsigned long sp = sigsp(regs->r1, ksig);
2148daa9	152
353b431b	153	return (void __user *)((sp - frame_size) & -8UL);
2148daa9 MS	154	}
2148daa9 MS	155
9c53c7ec RW	156	static int setup_rt_frame(struct ksignal ksig, sigset_t set,
9c53c7ec RW	157	struct pt_regs *regs)
2148daa9	158	{
353b431b	159	struct rt_sigframe __user *frame;
9c53c7ec	160	int err = 0, sig = ksig->sig;
ed4602e1	161	unsigned long signal;
2ee2ff87 MS	162	unsigned long address = 0;
	163	#ifdef CONFIG_MMU
	164	pmd_t *pmdp;
	165	pte_t *ptep;
	166	#endif
2148daa9	167
c001cd21	168	frame = get_sigframe(ksig, regs, sizeof(*frame));
2148daa9 MS	169
2148daa9 MS	170	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
9c53c7ec	171	return -EFAULT;
2148daa9 MS	172
	173	signal = current_thread_info()->exec_domain
	174	&& current_thread_info()->exec_domain->signal_invmap
	175	&& sig < 32
	176	? current_thread_info()->exec_domain->signal_invmap[sig]
ed4602e1	177	: (unsigned long)sig;
2148daa9	178
9c53c7ec RW	179	if (ksig->ka.sa.sa_flags & SA_SIGINFO)
9c53c7ec RW	180	err \|= copy_siginfo_to_user(&frame->info, &ksig->info);
2148daa9 MS	181
	182	/* Create the ucontext. */
	183	err \|= __put_user(0, &frame->uc.uc_flags);
2cfedb97	184	err \|= __put_user(NULL, &frame->uc.uc_link);
4a9d32d3	185	err \|= __save_altstack(&frame->uc.uc_stack, regs->r1);
2148daa9 MS	186	err \|= setup_sigcontext(&frame->uc.uc_mcontext,
	187	regs, set->sig[0]);
	188	err \|= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
	189
	190	/* Set up to return from userspace. If provided, use a stub
	191	already in userspace. */
	192	/* minus 8 is offset to cater for "rtsd r15,8" */
3183e068 AB	193	/* addi r12, r0, __NR_sigreturn */
	194	err \|= __put_user(0x31800000 \| __NR_rt_sigreturn ,
	195	frame->tramp + 0);
	196	/* brki r14, 0x8 */
	197	err \|= __put_user(0xb9cc0008, frame->tramp + 1);
	198
	199	/* Return from sighandler will jump to the tramp.
	200	Negative 8 offset because return is rtsd r15, 8 */
	201	regs->r15 = ((unsigned long)frame->tramp)-8;
	202
2ee2ff87 MS	203	address = ((unsigned long)frame->tramp);
	204	#ifdef CONFIG_MMU
	205	pmdp = pmd_offset(pud_offset(
	206	pgd_offset(current->mm, address),
	207	address), address);
	208
	209	preempt_disable();
	210	ptep = pte_offset_map(pmdp, address);
	211	if (pte_present(*ptep)) {
	212	address = (unsigned long) page_address(pte_page(*ptep));
	213	/* MS: I need add offset in page */
	214	address += ((unsigned long)frame->tramp) & ~PAGE_MASK;
	215	/* MS address is virtual */
a66a6265	216	address = __virt_to_phys(address);
2ee2ff87 MS	217	invalidate_icache_range(address, address + 8);
	218	flush_dcache_range(address, address + 8);
	219	}
	220	pte_unmap(ptep);
	221	preempt_enable();
	222	#else
	223	flush_icache_range(address, address + 8);
	224	flush_dcache_range(address, address + 8);
	225	#endif
2148daa9	226	if (err)
9c53c7ec	227	return -EFAULT;
2148daa9 MS	228
2148daa9 MS	229	/* Set up registers for signal handler */
6e83557c	230	regs->r1 = (unsigned long) frame;
2921e2bd	231
2148daa9 MS	232	/* Signal handler args: */
	233	regs->r5 = signal; /* arg 0: signum */
	234	regs->r6 = (unsigned long) &frame->info; /* arg 1: siginfo */
	235	regs->r7 = (unsigned long) &frame->uc; /* arg2: ucontext */
	236	/* Offset to handle microblaze rtid r14, 0 */
9c53c7ec	237	regs->pc = (unsigned long)ksig->ka.sa.sa_handler;
2148daa9 MS	238
	239	set_fs(USER_DS);
	240
	241	#ifdef DEBUG_SIG
6bd55f0b	242	pr_info("SIG deliver (%s:%d): sp=%p pc=%08lx\n",
2148daa9 MS	243	current->comm, current->pid, frame, regs->pc);
	244	#endif
	245
bcb8c8d0	246	return 0;
2148daa9 MS	247	}
	248
	249	/* Handle restarting system calls */
	250	static inline void
	251	handle_restart(struct pt_regs regs, struct k_sigaction ka, int has_handler)
	252	{
	253	switch (regs->r3) {
	254	case -ERESTART_RESTARTBLOCK:
	255	case -ERESTARTNOHAND:
	256	if (!has_handler)
	257	goto do_restart;
	258	regs->r3 = -EINTR;
	259	break;
	260	case -ERESTARTSYS:
	261	if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
	262	regs->r3 = -EINTR;
	263	break;
	264	}
	265	/* fallthrough */
	266	case -ERESTARTNOINTR:
	267	do_restart:
	268	/* offset of 4 bytes to re-execute trap (brki) instruction */
	269	regs->pc -= 4;
	270	break;
	271	}
	272	}
	273
	274	/*
	275	* OK, we're invoking a handler
	276	*/
	277
a610d6e6	278	static void
9c53c7ec	279	handle_signal(struct ksignal ksig, struct pt_regs regs)
2148daa9	280	{
b7f9a11a	281	sigset_t *oldset = sigmask_to_save();
bcb8c8d0 MF	282	int ret;
bcb8c8d0 MF	283
2148daa9	284	/* Set up the stack frame */
9c53c7ec	285	ret = setup_rt_frame(ksig, oldset, regs);
bcb8c8d0	286
9c53c7ec	287	signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
2148daa9 MS	288	}
	289
	290	/*
	291	* Note that 'init' is a special process: it doesn't get signals it doesn't
	292	* want to handle. Thus you cannot kill init even with a SIGKILL even by
	293	* mistake.
	294	*
	295	* Note that we go through the signals twice: once to check the signals that
	296	* the kernel can handle, and then we build all the user-level signal handling
	297	* stack-frames in one go after that.
	298	*/
83140191	299	static void do_signal(struct pt_regs *regs, int in_syscall)
2148daa9	300	{
9c53c7ec RW	301	struct ksignal ksig;
9c53c7ec RW	302
2148daa9	303	#ifdef DEBUG_SIG
6bd55f0b MS	304	pr_info("do signal: %p %d\n", regs, in_syscall);
6bd55f0b MS	305	pr_info("do signal2: %lx %lx %ld [%lx]\n", regs->pc, regs->r1,
2148daa9 MS	306	regs->r12, current_thread_info()->flags);
2148daa9 MS	307	#endif
2148daa9	308
9c53c7ec	309	if (get_signal(&ksig)) {
2148daa9 MS	310	/* Whee! Actually deliver the signal. */
2148daa9 MS	311	if (in_syscall)
9c53c7ec RW	312	handle_restart(regs, &ksig.ka, 1);
9c53c7ec RW	313	handle_signal(&ksig, regs);
83140191	314	return;
2148daa9 MS	315	}
	316
	317	if (in_syscall)
	318	handle_restart(regs, NULL, 0);
	319
3183e068 AB	320	/*
	321	* If there's no signal to deliver, we just put the saved sigmask
	322	* back.
	323	*/
51a7b448	324	restore_saved_sigmask();
2148daa9	325	}
969a9616	326
4378bb69	327	asmlinkage void do_notify_resume(struct pt_regs *regs, int in_syscall)
969a9616	328	{
969a9616	329	if (test_thread_flag(TIF_SIGPENDING))
83140191	330	do_signal(regs, in_syscall);
969a9616	331
a42c6ded	332	if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME))
969a9616	333	tracehook_notify_resume(regs);
969a9616	334	}