[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / m32r / kernel / signal.c

/*
 *  linux/arch/m32r/kernel/signal.c
 *
 *  Copyright (c) 2003  Hitoshi Yamamoto
 *
 *  Taken from i386 version.
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  1997-11-28  Modified for POSIX.1b signals by Richard Henderson
 *  2000-06-20  Pentium III FXSR, SSE support by Gareth Hughes
 */

#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/unistd.h>
#include <linux/stddef.h>
#include <linux/personality.h>
#include <linux/freezer.h>
#include <linux/tracehook.h>
#include <asm/cacheflush.h>
#include <asm/ucontext.h>
#include <asm/uaccess.h>

#define DEBUG_SIG 0

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

asmlinkage int
sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
		unsigned long r2, unsigned long r3, unsigned long r4,
		unsigned long r5, unsigned long r6, struct pt_regs *regs)
{
	return do_sigaltstack(uss, uoss, regs->spu);
}


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

struct rt_sigframe
{
	int sig;
	struct siginfo __user *pinfo;
	void __user *puc;
	struct siginfo info;
	struct ucontext uc;
//	struct _fpstate fpstate;
};

static int
restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
		   int *r0_p)
{
	unsigned int err = 0;

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

#define COPY(x)		err |= __get_user(regs->x, &sc->sc_##x)
	COPY(r4);
	COPY(r5);
	COPY(r6);
	COPY(pt_regs);
	/* COPY(r0); Skip r0 */
	COPY(r1);
	COPY(r2);
	COPY(r3);
	COPY(r7);
	COPY(r8);
	COPY(r9);
	COPY(r10);
	COPY(r11);
	COPY(r12);
	COPY(acc0h);
	COPY(acc0l);
	COPY(acc1h);		/* ISA_DSP_LEVEL2 only */
	COPY(acc1l);		/* ISA_DSP_LEVEL2 only */
	COPY(psw);
	COPY(bpc);
	COPY(bbpsw);
	COPY(bbpc);
	COPY(spu);
	COPY(fp);
	COPY(lr);
	COPY(spi);
#undef COPY

	regs->syscall_nr = -1;	/* disable syscall checks */
	err |= __get_user(*r0_p, &sc->sc_r0);

	return err;
}

asmlinkage int
sys_rt_sigreturn(unsigned long r0, unsigned long r1,
		 unsigned long r2, unsigned long r3, unsigned long r4,
		 unsigned long r5, unsigned long r6, struct pt_regs *regs)
{
	struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->spu;
	sigset_t set;
	int result;

	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);
	set_current_blocked(&set);

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

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

	return result;

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->sc_##x)
	COPY(r4);
	COPY(r5);
	COPY(r6);
	COPY(pt_regs);
	COPY(r0);
	COPY(r1);
	COPY(r2);
	COPY(r3);
	COPY(r7);
	COPY(r8);
	COPY(r9);
	COPY(r10);
	COPY(r11);
	COPY(r12);
	COPY(acc0h);
	COPY(acc0l);
	COPY(acc1h);		/* ISA_DSP_LEVEL2 only */
	COPY(acc1l);		/* ISA_DSP_LEVEL2 only */
	COPY(psw);
	COPY(bpc);
	COPY(bbpsw);
	COPY(bbpc);
	COPY(spu);
	COPY(fp);
	COPY(lr);
	COPY(spi);
#undef COPY

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

	return err;
}

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

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

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

	frame = get_sigframe(ka, regs->spu, sizeof(*frame));

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

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

	err |= __put_user(signal, &frame->sig);
	if (err)
		goto give_sigsegv;

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

	/* Create the ucontext.  */
	err |= __put_user(0, &frame->uc.uc_flags);
	err |= __put_user(0, &frame->uc.uc_link);
	err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
	err |= __put_user(sas_ss_flags(regs->spu),
			  &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, set->sig[0]);
	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
	if (err)
		goto give_sigsegv;

	/* Set up to return from userspace.  */
	regs->lr = (unsigned long)ka->sa.sa_restorer;

	/* Set up registers for signal handler */
	regs->spu = (unsigned long)frame;
	regs->r0 = signal;	/* Arg for signal handler */
	regs->r1 = (unsigned long)&frame->info;
	regs->r2 = (unsigned long)&frame->uc;
	regs->bpc = (unsigned long)ka->sa.sa_handler;

	set_fs(USER_DS);

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

	return 0;

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

static int prev_insn(struct pt_regs *regs)
{
	u16 inst;
	if (get_user(inst, (u16 __user *)(regs->bpc - 2)))
		return -EFAULT;
	if ((inst & 0xfff0) == 0x10f0)	/* trap ? */
		regs->bpc -= 2;
	else
		regs->bpc -= 4;
	regs->syscall_nr = -1;
	return 0;
}

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

static void
handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
	      struct pt_regs *regs)
{
	/* Are we from a system call? */
	if (regs->syscall_nr >= 0) {
		/* If so, check system call restarting.. */
		switch (regs->r0) {
		        case -ERESTART_RESTARTBLOCK:
			case -ERESTARTNOHAND:
				regs->r0 = -EINTR;
				break;

			case -ERESTARTSYS:
				if (!(ka->sa.sa_flags & SA_RESTART)) {
					regs->r0 = -EINTR;
					break;
				}
			/* fallthrough */
			case -ERESTARTNOINTR:
				regs->r0 = regs->orig_r0;
				if (prev_insn(regs) < 0)
					return -EFAULT;
		}
	}

	/* Set up the stack frame */
	if (setup_rt_frame(sig, ka, info, sigmask_to_save(), regs))
		return;

	block_sigmask(ka, sig);
}

/*
 * 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)
{
	siginfo_t info;
	int signr;
	struct k_sigaction ka;

	/*
	 * We want the common case to go fast, which
	 * is why we may in certain cases get here from
	 * kernel mode. Just return without doing anything
	 * if so.
	 */
	if (!user_mode(regs))
		return;

	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
	if (signr > 0) {
		/* Re-enable any watchpoints before delivering the
		 * signal to user space. The processor register will
		 * have been cleared if the watchpoint triggered
		 * inside the kernel.
		 */

		/* Whee!  Actually deliver the signal.  */
		handle_signal(signr, &ka, &info, regs);

		return;
	}

	/* Did we come from a system call? */
	if (regs->syscall_nr >= 0) {
		/* Restart the system call - no handlers present */
		if (regs->r0 == -ERESTARTNOHAND ||
		    regs->r0 == -ERESTARTSYS ||
		    regs->r0 == -ERESTARTNOINTR) {
			regs->r0 = regs->orig_r0;
			prev_insn(regs);
		} else if (regs->r0 == -ERESTART_RESTARTBLOCK){
			regs->r0 = regs->orig_r0;
			regs->r7 = __NR_restart_syscall;
			prev_insn(regs);
		}
	}
	restore_saved_sigmask();
}

/*
 * notification of userspace execution resumption
 * - triggered by current->work.notify_resume
 */
void do_notify_resume(struct pt_regs *regs, __u32 thread_info_flags)
{
	/* Pending single-step? */
	if (thread_info_flags & _TIF_SINGLESTEP)
		clear_thread_flag(TIF_SINGLESTEP);

	/* deal with pending signal delivery */
	if (thread_info_flags & _TIF_SIGPENDING)
		do_signal(regs);

	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
		clear_thread_flag(TIF_NOTIFY_RESUME);
		tracehook_notify_resume(regs);
	}

	clear_thread_flag(TIF_IRET);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/m32r/kernel/signal.c
	3	*
	4	* Copyright (c) 2003 Hitoshi Yamamoto
	5	*
	6	* Taken from i386 version.
	7	* Copyright (C) 1991, 1992 Linus Torvalds
	8	*
	9	* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
	10	* 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes
	11	*/
	12
1da177e4 LT	13	#include <linux/sched.h>
	14	#include <linux/mm.h>
	15	#include <linux/smp.h>
1da177e4 LT	16	#include <linux/kernel.h>
	17	#include <linux/signal.h>
	18	#include <linux/errno.h>
	19	#include <linux/wait.h>
	20	#include <linux/unistd.h>
	21	#include <linux/stddef.h>
	22	#include <linux/personality.h>
7dfb7103	23	#include <linux/freezer.h>
733e5e4b	24	#include <linux/tracehook.h>
1da177e4 LT	25	#include <asm/cacheflush.h>
	26	#include <asm/ucontext.h>
	27	#include <asm/uaccess.h>
	28
	29	#define DEBUG_SIG 0
	30
99d6734f KM	31	#define _BLOCKABLE (~(sigmask(SIGKILL) \| sigmask(SIGSTOP)))
99d6734f KM	32
1da177e4 LT	33	asmlinkage int
	34	sys_sigaltstack(const stack_t __user uss, stack_t __user uoss,
	35	unsigned long r2, unsigned long r3, unsigned long r4,
6ced13cd	36	unsigned long r5, unsigned long r6, struct pt_regs *regs)
1da177e4	37	{
6ced13cd	38	return do_sigaltstack(uss, uoss, regs->spu);
1da177e4 LT	39	}
	40
	41
	42	/*
	43	* Do a signal return; undo the signal stack.
	44	*/
	45
	46	struct rt_sigframe
	47	{
	48	int sig;
870e75a2 AV	49	struct siginfo __user *pinfo;
870e75a2 AV	50	void __user *puc;
1da177e4 LT	51	struct siginfo info;
	52	struct ucontext uc;
	53	// struct _fpstate fpstate;
	54	};
	55
	56	static int
	57	restore_sigcontext(struct pt_regs regs, struct sigcontext __user sc,
	58	int *r0_p)
	59	{
	60	unsigned int err = 0;
	61
	62	/* Always make any pending restarted system calls return -EINTR */
	63	current_thread_info()->restart_block.fn = do_no_restart_syscall;
	64
	65	#define COPY(x) err \|= __get_user(regs->x, &sc->sc_##x)
	66	COPY(r4);
	67	COPY(r5);
	68	COPY(r6);
	69	COPY(pt_regs);
	70	/* COPY(r0); Skip r0 */
	71	COPY(r1);
	72	COPY(r2);
	73	COPY(r3);
	74	COPY(r7);
	75	COPY(r8);
	76	COPY(r9);
	77	COPY(r10);
	78	COPY(r11);
	79	COPY(r12);
1da177e4 LT	80	COPY(acc0h);
1da177e4 LT	81	COPY(acc0l);
9674dcf7 HT	82	COPY(acc1h); /* ISA_DSP_LEVEL2 only */
9674dcf7 HT	83	COPY(acc1l); /* ISA_DSP_LEVEL2 only */
1da177e4 LT	84	COPY(psw);
	85	COPY(bpc);
	86	COPY(bbpsw);
	87	COPY(bbpc);
	88	COPY(spu);
	89	COPY(fp);
	90	COPY(lr);
	91	COPY(spi);
	92	#undef COPY
	93
	94	regs->syscall_nr = -1; /* disable syscall checks */
	95	err \|= __get_user(*r0_p, &sc->sc_r0);
	96
	97	return err;
	98	}
	99
	100	asmlinkage int
	101	sys_rt_sigreturn(unsigned long r0, unsigned long r1,
	102	unsigned long r2, unsigned long r3, unsigned long r4,
6ced13cd	103	unsigned long r5, unsigned long r6, struct pt_regs *regs)
1da177e4	104	{
6ced13cd	105	struct rt_sigframe __user frame = (struct rt_sigframe __user )regs->spu;
1da177e4	106	sigset_t set;
1da177e4 LT	107	int result;
	108
	109	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	110	goto badframe;
	111	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
	112	goto badframe;
	113
	114	sigdelsetmask(&set, ~_BLOCKABLE);
3883e301	115	set_current_blocked(&set);
1da177e4	116
6ced13cd	117	if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &result))
1da177e4 LT	118	goto badframe;
1da177e4 LT	119
6ced13cd	120	if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->spu) == -EFAULT)
1da177e4	121	goto badframe;
1da177e4 LT	122
	123	return result;
	124
	125	badframe:
	126	force_sig(SIGSEGV, current);
	127	return 0;
	128	}
	129
	130	/*
	131	* Set up a signal frame.
	132	*/
	133
	134	static int
	135	setup_sigcontext(struct sigcontext __user sc, struct pt_regs regs,
	136	unsigned long mask)
	137	{
	138	int err = 0;
	139
	140	#define COPY(x) err \|= __put_user(regs->x, &sc->sc_##x)
	141	COPY(r4);
	142	COPY(r5);
	143	COPY(r6);
	144	COPY(pt_regs);
	145	COPY(r0);
	146	COPY(r1);
	147	COPY(r2);
	148	COPY(r3);
	149	COPY(r7);
	150	COPY(r8);
	151	COPY(r9);
	152	COPY(r10);
	153	COPY(r11);
	154	COPY(r12);
1da177e4 LT	155	COPY(acc0h);
1da177e4 LT	156	COPY(acc0l);
9674dcf7 HT	157	COPY(acc1h); /* ISA_DSP_LEVEL2 only */
9674dcf7 HT	158	COPY(acc1l); /* ISA_DSP_LEVEL2 only */
1da177e4 LT	159	COPY(psw);
	160	COPY(bpc);
	161	COPY(bbpsw);
	162	COPY(bbpc);
	163	COPY(spu);
	164	COPY(fp);
	165	COPY(lr);
	166	COPY(spi);
	167	#undef COPY
	168
	169	err \|= __put_user(mask, &sc->oldmask);
	170
	171	return err;
	172	}
	173
	174	/*
	175	* Determine which stack to use..
	176	*/
	177	static inline void __user *
	178	get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
	179	{
	180	/* This is the X/Open sanctioned signal stack switching. */
	181	if (ka->sa.sa_flags & SA_ONSTACK) {
	182	if (sas_ss_flags(sp) == 0)
	183	sp = current->sas_ss_sp + current->sas_ss_size;
	184	}
	185
	186	return (void __user *)((sp - frame_size) & -8ul);
	187	}
	188
a05c4e1d	189	static int setup_rt_frame(int sig, struct k_sigaction ka, siginfo_t info,
1da177e4 LT	190	sigset_t set, struct pt_regs regs)
	191	{
	192	struct rt_sigframe __user *frame;
	193	int err = 0;
	194	int signal;
	195
	196	frame = get_sigframe(ka, regs->spu, sizeof(*frame));
	197
	198	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	199	goto give_sigsegv;
	200
	201	signal = current_thread_info()->exec_domain
	202	&& current_thread_info()->exec_domain->signal_invmap
	203	&& sig < 32
	204	? current_thread_info()->exec_domain->signal_invmap[sig]
	205	: sig;
	206
	207	err \|= __put_user(signal, &frame->sig);
	208	if (err)
	209	goto give_sigsegv;
	210
	211	err \|= __put_user(&frame->info, &frame->pinfo);
	212	err \|= __put_user(&frame->uc, &frame->puc);
	213	err \|= copy_siginfo_to_user(&frame->info, info);
	214	if (err)
	215	goto give_sigsegv;
	216
	217	/* Create the ucontext. */
	218	err \|= __put_user(0, &frame->uc.uc_flags);
	219	err \|= __put_user(0, &frame->uc.uc_link);
	220	err \|= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
	221	err \|= __put_user(sas_ss_flags(regs->spu),
	222	&frame->uc.uc_stack.ss_flags);
	223	err \|= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
	224	err \|= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
	225	err \|= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
	226	if (err)
	227	goto give_sigsegv;
	228
	229	/* Set up to return from userspace. */
	230	regs->lr = (unsigned long)ka->sa.sa_restorer;
	231
	232	/* Set up registers for signal handler */
	233	regs->spu = (unsigned long)frame;
	234	regs->r0 = signal; /* Arg for signal handler */
	235	regs->r1 = (unsigned long)&frame->info;
	236	regs->r2 = (unsigned long)&frame->uc;
	237	regs->bpc = (unsigned long)ka->sa.sa_handler;
	238
	239	set_fs(USER_DS);
	240
	241	#if DEBUG_SIG
	242	printk("SIG deliver (%s:%d): sp=%p pc=%p\n",
	243	current->comm, current->pid, frame, regs->pc);
	244	#endif
	245
a05c4e1d	246	return 0;
1da177e4 LT	247
	248	give_sigsegv:
	249	force_sigsegv(sig, current);
a05c4e1d	250	return -EFAULT;
1da177e4 LT	251	}
1da177e4 LT	252
bb9c861e AV	253	static int prev_insn(struct pt_regs *regs)
	254	{
	255	u16 inst;
388d148f	256	if (get_user(inst, (u16 __user *)(regs->bpc - 2)))
bb9c861e AV	257	return -EFAULT;
	258	if ((inst & 0xfff0) == 0x10f0) /* trap ? */
	259	regs->bpc -= 2;
	260	else
	261	regs->bpc -= 4;
	262	regs->syscall_nr = -1;
	263	return 0;
	264	}
	265
1da177e4 LT	266	/*
	267	* OK, we're invoking a handler
	268	*/
	269
a610d6e6	270	static void
1da177e4	271	handle_signal(unsigned long sig, struct k_sigaction ka, siginfo_t info,
b7f9a11a	272	struct pt_regs *regs)
1da177e4	273	{
1da177e4 LT	274	/* Are we from a system call? */
	275	if (regs->syscall_nr >= 0) {
	276	/* If so, check system call restarting.. */
	277	switch (regs->r0) {
	278	case -ERESTART_RESTARTBLOCK:
	279	case -ERESTARTNOHAND:
	280	regs->r0 = -EINTR;
	281	break;
	282
	283	case -ERESTARTSYS:
	284	if (!(ka->sa.sa_flags & SA_RESTART)) {
	285	regs->r0 = -EINTR;
	286	break;
	287	}
	288	/* fallthrough */
	289	case -ERESTARTNOINTR:
	290	regs->r0 = regs->orig_r0;
bb9c861e AV	291	if (prev_insn(regs) < 0)
bb9c861e AV	292	return -EFAULT;
1da177e4 LT	293	}
	294	}
	295
	296	/* Set up the stack frame */
b7f9a11a	297	if (setup_rt_frame(sig, ka, info, sigmask_to_save(), regs))
a610d6e6	298	return;
1da177e4	299
3883e301	300	block_sigmask(ka, sig);
1da177e4 LT	301	}
	302
	303	/*
	304	* Note that 'init' is a special process: it doesn't get signals it doesn't
	305	* want to handle. Thus you cannot kill init even with a SIGKILL even by
	306	* mistake.
	307	*/
a05c4e1d	308	static void do_signal(struct pt_regs *regs)
1da177e4 LT	309	{
	310	siginfo_t info;
	311	int signr;
	312	struct k_sigaction ka;
1da177e4 LT	313
	314	/*
	315	* We want the common case to go fast, which
	316	* is why we may in certain cases get here from
	317	* kernel mode. Just return without doing anything
	318	* if so.
	319	*/
	320	if (!user_mode(regs))
a05c4e1d	321	return;
1da177e4	322
1da177e4 LT	323	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
1da177e4 LT	324	if (signr > 0) {
5aa8b6c1	325	/* Re-enable any watchpoints before delivering the
1da177e4 LT	326	* signal to user space. The processor register will
	327	* have been cleared if the watchpoint triggered
	328	* inside the kernel.
	329	*/
	330
	331	/* Whee! Actually deliver the signal. */
a610d6e6	332	handle_signal(signr, &ka, &info, regs);
a05c4e1d AV	333
a05c4e1d AV	334	return;
1da177e4 LT	335	}
1da177e4 LT	336
1da177e4 LT	337	/* Did we come from a system call? */
	338	if (regs->syscall_nr >= 0) {
	339	/* Restart the system call - no handlers present */
	340	if (regs->r0 == -ERESTARTNOHAND \|\|
	341	regs->r0 == -ERESTARTSYS \|\|
	342	regs->r0 == -ERESTARTNOINTR) {
	343	regs->r0 = regs->orig_r0;
bb9c861e	344	prev_insn(regs);
a7481024	345	} else if (regs->r0 == -ERESTART_RESTARTBLOCK){
1da177e4 LT	346	regs->r0 = regs->orig_r0;
1da177e4 LT	347	regs->r7 = __NR_restart_syscall;
bb9c861e	348	prev_insn(regs);
1da177e4 LT	349	}
1da177e4 LT	350	}
51a7b448	351	restore_saved_sigmask();
1da177e4 LT	352	}
	353
	354	/*
	355	* notification of userspace execution resumption
	356	* - triggered by current->work.notify_resume
	357	*/
a7f8388e	358	void do_notify_resume(struct pt_regs *regs, __u32 thread_info_flags)
1da177e4 LT	359	{
	360	/* Pending single-step? */
	361	if (thread_info_flags & _TIF_SINGLESTEP)
	362	clear_thread_flag(TIF_SINGLESTEP);
	363
	364	/* deal with pending signal delivery */
	365	if (thread_info_flags & _TIF_SIGPENDING)
a7f8388e	366	do_signal(regs);
1da177e4	367
d0420c83 DH	368	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
	369	clear_thread_flag(TIF_NOTIFY_RESUME);
	370	tracehook_notify_resume(regs);
	371	}
	372
1da177e4 LT	373	clear_thread_flag(TIF_IRET);
1da177e4 LT	374	}