[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

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;

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