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

/*
 * arch/score/kernel/signal.c
 *
 * Score Processor version.
 *
 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
 *  Chen Liqin <liqin.chen@sunplusct.com>
 *  Lennox Wu <lennox.wu@sunplusct.com>
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/ptrace.h>
#include <linux/unistd.h>
#include <linux/uaccess.h>
#include <linux/tracehook.h>

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

struct rt_sigframe {
	u32 rs_ass[4];		/* argument save space */
	u32 rs_code[2];		/* signal trampoline */
	struct siginfo rs_info;
	struct ucontext rs_uc;
};

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

	reg = regs->cp0_epc; err |= __put_user(reg, &sc->sc_pc);
	err |= __put_user(regs->cp0_psr, &sc->sc_psr);
	err |= __put_user(regs->cp0_condition, &sc->sc_condition);


#define save_gp_reg(i) {				\
	reg = regs->regs[i];				\
	err |= __put_user(reg, &sc->sc_regs[i]);	\
} while (0)
	save_gp_reg(0); save_gp_reg(1); save_gp_reg(2);
	save_gp_reg(3); save_gp_reg(4); save_gp_reg(5);
	save_gp_reg(6);	save_gp_reg(7); save_gp_reg(8);
	save_gp_reg(9); save_gp_reg(10); save_gp_reg(11);
	save_gp_reg(12); save_gp_reg(13); save_gp_reg(14);
	save_gp_reg(15); save_gp_reg(16); save_gp_reg(17);
	save_gp_reg(18); save_gp_reg(19); save_gp_reg(20);
	save_gp_reg(21); save_gp_reg(22); save_gp_reg(23);
	save_gp_reg(24); save_gp_reg(25); save_gp_reg(26);
	save_gp_reg(27); save_gp_reg(28); save_gp_reg(29);
#undef save_gp_reg

	reg = regs->ceh; err |= __put_user(reg, &sc->sc_mdceh);
	reg = regs->cel; err |= __put_user(reg, &sc->sc_mdcel);
	err |= __put_user(regs->cp0_ecr, &sc->sc_ecr);
	err |= __put_user(regs->cp0_ema, &sc->sc_ema);

	return err;
}

static int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
{
	int err = 0;
	u32 reg;

	err |= __get_user(regs->cp0_epc, &sc->sc_pc);
	err |= __get_user(regs->cp0_condition, &sc->sc_condition);

	err |= __get_user(reg, &sc->sc_mdceh);
	regs->ceh = (int) reg;
	err |= __get_user(reg, &sc->sc_mdcel);
	regs->cel = (int) reg;

	err |= __get_user(reg, &sc->sc_psr);
	regs->cp0_psr = (int) reg;
	err |= __get_user(reg, &sc->sc_ecr);
	regs->cp0_ecr = (int) reg;
	err |= __get_user(reg, &sc->sc_ema);
	regs->cp0_ema = (int) reg;

#define restore_gp_reg(i) do {				\
	err |= __get_user(reg, &sc->sc_regs[i]);	\
	regs->regs[i] = reg;				\
} while (0)
	restore_gp_reg(0); restore_gp_reg(1); restore_gp_reg(2);
	restore_gp_reg(3); restore_gp_reg(4); restore_gp_reg(5);
	restore_gp_reg(6); restore_gp_reg(7); restore_gp_reg(8);
	restore_gp_reg(9); restore_gp_reg(10); restore_gp_reg(11);
	restore_gp_reg(12); restore_gp_reg(13); restore_gp_reg(14);
	restore_gp_reg(15); restore_gp_reg(16); restore_gp_reg(17);
	restore_gp_reg(18); restore_gp_reg(19);	restore_gp_reg(20);
	restore_gp_reg(21); restore_gp_reg(22); restore_gp_reg(23);
	restore_gp_reg(24); restore_gp_reg(25); restore_gp_reg(26);
	restore_gp_reg(27); restore_gp_reg(28); restore_gp_reg(29);
#undef restore_gp_reg

	return err;
}

/*
 * Determine which stack to use..
 */
static 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->regs[0];
	sp -= 32;

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

	return (void __user*)((sp - frame_size) & ~7);
}

asmlinkage long
score_rt_sigreturn(struct pt_regs *regs)
{
	struct rt_sigframe __user *frame;
	sigset_t set;
	int sig;

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

	frame = (struct rt_sigframe __user *) regs->regs[0];
	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
		goto badframe;
	if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
		goto badframe;

	set_current_blocked(&set);

	sig = restore_sigcontext(regs, &frame->rs_uc.uc_mcontext);
	if (sig < 0)
		goto badframe;
	else if (sig)
		force_sig(sig, current);

	if (restore_altstack(&frame->rs_uc.uc_stack))
		goto badframe;
	regs->is_syscall = 0;

	__asm__ __volatile__(
		"mv\tr0, %0\n\t"
		"la\tr8, syscall_exit\n\t"
		"br\tr8\n\t"
		: : "r" (regs) : "r8");

badframe:
	force_sig(SIGSEGV, current);

	return 0;
}

static int setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs,
			  sigset_t *set)
{
	struct rt_sigframe __user *frame;
	int err = 0;

	frame = get_sigframe(&ksig->ka, regs, sizeof(*frame));
	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
		return -EFAULT;

	/*
	 * Set up the return code ...
	 *
	 *         li      v0, __NR_rt_sigreturn
	 *         syscall
	 */
	err |= __put_user(0x87788000 + __NR_rt_sigreturn*2,
			frame->rs_code + 0);
	err |= __put_user(0x80008002, frame->rs_code + 1);
	flush_cache_sigtramp((unsigned long) frame->rs_code);

	err |= copy_siginfo_to_user(&frame->rs_info, &ksig->info);
	err |= __put_user(0, &frame->rs_uc.uc_flags);
	err |= __put_user(NULL, &frame->rs_uc.uc_link);
	err |= __save_altstack(&frame->rs_uc.uc_stack, regs->regs[0]);
	err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
	err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));

	if (err)
		return -EFAULT;

	regs->regs[0] = (unsigned long) frame;
	regs->regs[3] = (unsigned long) frame->rs_code;
	regs->regs[4] = ksig->sig;
	regs->regs[5] = (unsigned long) &frame->rs_info;
	regs->regs[6] = (unsigned long) &frame->rs_uc;
	regs->regs[29] = (unsigned long) ksig->ka.sa.sa_handler;
	regs->cp0_epc = (unsigned long) ksig->ka.sa.sa_handler;

	return 0;
}

static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
{
	int ret;

	if (regs->is_syscall) {
		switch (regs->regs[4]) {
		case ERESTART_RESTARTBLOCK:
		case ERESTARTNOHAND:
			regs->regs[4] = EINTR;
			break;
		case ERESTARTSYS:
			if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
				regs->regs[4] = EINTR;
				break;
			}
		case ERESTARTNOINTR:
			regs->regs[4] = regs->orig_r4;
			regs->regs[7] = regs->orig_r7;
			regs->cp0_epc -= 8;
		}

		regs->is_syscall = 0;
	}

	/*
	 * Set up the stack frame
	 */
	ret = setup_rt_frame(ksig, regs, sigmask_to_save());

	signal_setup_done(ret, ksig, 0);
}

static void do_signal(struct pt_regs *regs)
{
	struct ksignal ksig;

	/*
	 * 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;

	if (get_signal(&ksig)) {
		/* Actually deliver the signal.  */
		handle_signal(&ksig, regs);
		return;
	}

	if (regs->is_syscall) {
		if (regs->regs[4] == ERESTARTNOHAND ||
		    regs->regs[4] == ERESTARTSYS ||
		    regs->regs[4] == ERESTARTNOINTR) {
			regs->regs[4] = regs->orig_r4;
			regs->regs[7] = regs->orig_r7;
			regs->cp0_epc -= 8;
		}

		if (regs->regs[4] == ERESTART_RESTARTBLOCK) {
			regs->regs[27] = __NR_restart_syscall;
			regs->regs[4] = regs->orig_r4;
			regs->regs[7] = regs->orig_r7;
			regs->cp0_epc -= 8;
		}

		regs->is_syscall = 0;	/* Don't deal with this again.  */
	}

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

/*
 * notification of userspace execution resumption
 * - triggered by the TIF_WORK_MASK flags
 */
asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused,
				__u32 thread_info_flags)
{
	/* 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);
	}
}
Commit	Line	Data
6bc9a396 CL	1	/*
	2	* arch/score/kernel/signal.c
	3	*
	4	* Score Processor version.
	5	*
	6	* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
	7	* Chen Liqin <liqin.chen@sunplusct.com>
	8	* Lennox Wu <lennox.wu@sunplusct.com>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, see the file COPYING, or write
	22	* to the Free Software Foundation, Inc.,
	23	* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	24	*/
	25
	26	#include <linux/errno.h>
	27	#include <linux/signal.h>
d8aa899b	28	#include <linux/ptrace.h>
6bc9a396 CL	29	#include <linux/unistd.h>
6bc9a396 CL	30	#include <linux/uaccess.h>
1d5d4dbe	31	#include <linux/tracehook.h>
9fb24cc5	32
d8aa899b	33	#include <asm/cacheflush.h>
9fb24cc5 AB	34	#include <asm/syscalls.h>
9fb24cc5 AB	35	#include <asm/ucontext.h>
6bc9a396	36
6bc9a396 CL	37	struct rt_sigframe {
	38	u32 rs_ass[4]; /* argument save space */
	39	u32 rs_code[2]; /* signal trampoline */
	40	struct siginfo rs_info;
	41	struct ucontext rs_uc;
	42	};
	43
bddc6059	44	static int setup_sigcontext(struct pt_regs regs, struct sigcontext __user sc)
6bc9a396 CL	45	{
	46	int err = 0;
	47	unsigned long reg;
	48
	49	reg = regs->cp0_epc; err \|= __put_user(reg, &sc->sc_pc);
	50	err \|= __put_user(regs->cp0_psr, &sc->sc_psr);
	51	err \|= __put_user(regs->cp0_condition, &sc->sc_condition);
	52
	53
	54	#define save_gp_reg(i) { \
	55	reg = regs->regs[i]; \
	56	err \|= __put_user(reg, &sc->sc_regs[i]); \
	57	} while (0)
	58	save_gp_reg(0); save_gp_reg(1); save_gp_reg(2);
	59	save_gp_reg(3); save_gp_reg(4); save_gp_reg(5);
	60	save_gp_reg(6); save_gp_reg(7); save_gp_reg(8);
	61	save_gp_reg(9); save_gp_reg(10); save_gp_reg(11);
	62	save_gp_reg(12); save_gp_reg(13); save_gp_reg(14);
	63	save_gp_reg(15); save_gp_reg(16); save_gp_reg(17);
	64	save_gp_reg(18); save_gp_reg(19); save_gp_reg(20);
	65	save_gp_reg(21); save_gp_reg(22); save_gp_reg(23);
	66	save_gp_reg(24); save_gp_reg(25); save_gp_reg(26);
	67	save_gp_reg(27); save_gp_reg(28); save_gp_reg(29);
	68	#undef save_gp_reg
	69
	70	reg = regs->ceh; err \|= __put_user(reg, &sc->sc_mdceh);
	71	reg = regs->cel; err \|= __put_user(reg, &sc->sc_mdcel);
	72	err \|= __put_user(regs->cp0_ecr, &sc->sc_ecr);
	73	err \|= __put_user(regs->cp0_ema, &sc->sc_ema);
	74
	75	return err;
	76	}
	77
bddc6059	78	static int restore_sigcontext(struct pt_regs regs, struct sigcontext __user sc)
6bc9a396 CL	79	{
	80	int err = 0;
	81	u32 reg;
	82
	83	err \|= __get_user(regs->cp0_epc, &sc->sc_pc);
	84	err \|= __get_user(regs->cp0_condition, &sc->sc_condition);
	85
	86	err \|= __get_user(reg, &sc->sc_mdceh);
	87	regs->ceh = (int) reg;
	88	err \|= __get_user(reg, &sc->sc_mdcel);
	89	regs->cel = (int) reg;
	90
	91	err \|= __get_user(reg, &sc->sc_psr);
	92	regs->cp0_psr = (int) reg;
	93	err \|= __get_user(reg, &sc->sc_ecr);
	94	regs->cp0_ecr = (int) reg;
	95	err \|= __get_user(reg, &sc->sc_ema);
	96	regs->cp0_ema = (int) reg;
	97
	98	#define restore_gp_reg(i) do { \
	99	err \|= __get_user(reg, &sc->sc_regs[i]); \
	100	regs->regs[i] = reg; \
	101	} while (0)
	102	restore_gp_reg(0); restore_gp_reg(1); restore_gp_reg(2);
	103	restore_gp_reg(3); restore_gp_reg(4); restore_gp_reg(5);
	104	restore_gp_reg(6); restore_gp_reg(7); restore_gp_reg(8);
	105	restore_gp_reg(9); restore_gp_reg(10); restore_gp_reg(11);
	106	restore_gp_reg(12); restore_gp_reg(13); restore_gp_reg(14);
	107	restore_gp_reg(15); restore_gp_reg(16); restore_gp_reg(17);
	108	restore_gp_reg(18); restore_gp_reg(19); restore_gp_reg(20);
	109	restore_gp_reg(21); restore_gp_reg(22); restore_gp_reg(23);
	110	restore_gp_reg(24); restore_gp_reg(25); restore_gp_reg(26);
	111	restore_gp_reg(27); restore_gp_reg(28); restore_gp_reg(29);
	112	#undef restore_gp_reg
	113
	114	return err;
	115	}
	116
	117	/*
	118	* Determine which stack to use..
	119	*/
bddc6059 AB	120	static void __user get_sigframe(struct k_sigaction ka,
bddc6059 AB	121	struct pt_regs *regs, size_t frame_size)
6bc9a396 CL	122	{
	123	unsigned long sp;
	124
	125	/* Default to using normal stack */
	126	sp = regs->regs[0];
	127	sp -= 32;
	128
	129	/* This is the X/Open sanctioned signal stack switching. */
	130	if ((ka->sa.sa_flags & SA_ONSTACK) && (!on_sig_stack(sp)))
	131	sp = current->sas_ss_sp + current->sas_ss_size;
	132
a1f8213b	133	return (void __user*)((sp - frame_size) & ~7);
6bc9a396 CL	134	}
6bc9a396 CL	135
bddc6059 AB	136	asmlinkage long
bddc6059 AB	137	score_rt_sigreturn(struct pt_regs *regs)
6bc9a396 CL	138	{
	139	struct rt_sigframe __user *frame;
	140	sigset_t set;
6bc9a396 CL	141	int sig;
6bc9a396 CL	142
f2ccfb3e	143	/* Always make any pending restarted system calls return -EINTR */
f56141e3	144	current->restart_block.fn = do_no_restart_syscall;
f2ccfb3e	145
6bc9a396 CL	146	frame = (struct rt_sigframe __user *) regs->regs[0];
	147	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	148	goto badframe;
	149	if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
	150	goto badframe;
	151
4c3181bd	152	set_current_blocked(&set);
6bc9a396 CL	153
	154	sig = restore_sigcontext(regs, &frame->rs_uc.uc_mcontext);
	155	if (sig < 0)
	156	goto badframe;
	157	else if (sig)
	158	force_sig(sig, current);
	159
b774cc5c	160	if (restore_altstack(&frame->rs_uc.uc_stack))
afd3f96d	161	goto badframe;
af445f45	162	regs->is_syscall = 0;
6bc9a396 CL	163
	164	__asm__ __volatile__(
	165	"mv\tr0, %0\n\t"
	166	"la\tr8, syscall_exit\n\t"
	167	"br\tr8\n\t"
	168	: : "r" (regs) : "r8");
	169
	170	badframe:
	171	force_sig(SIGSEGV, current);
bddc6059 AB	172
bddc6059 AB	173	return 0;
6bc9a396 CL	174	}
6bc9a396 CL	175
2bb12b77 RW	176	static int setup_rt_frame(struct ksignal ksig, struct pt_regs regs,
2bb12b77 RW	177	sigset_t *set)
6bc9a396	178	{
a1f8213b	179	struct rt_sigframe __user *frame;
6bc9a396 CL	180	int err = 0;
6bc9a396 CL	181
2bb12b77	182	frame = get_sigframe(&ksig->ka, regs, sizeof(*frame));
6bc9a396	183	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
2bb12b77	184	return -EFAULT;
6bc9a396 CL	185
	186	/*
	187	* Set up the return code ...
	188	*
	189	* li v0, __NR_rt_sigreturn
	190	* syscall
	191	*/
	192	err \|= __put_user(0x87788000 + __NR_rt_sigreturn*2,
	193	frame->rs_code + 0);
	194	err \|= __put_user(0x80008002, frame->rs_code + 1);
	195	flush_cache_sigtramp((unsigned long) frame->rs_code);
	196
2bb12b77	197	err \|= copy_siginfo_to_user(&frame->rs_info, &ksig->info);
6bc9a396	198	err \|= __put_user(0, &frame->rs_uc.uc_flags);
c6067472	199	err \|= __put_user(NULL, &frame->rs_uc.uc_link);
b774cc5c	200	err \|= __save_altstack(&frame->rs_uc.uc_stack, regs->regs[0]);
6bc9a396 CL	201	err \|= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
	202	err \|= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
	203
	204	if (err)
2bb12b77	205	return -EFAULT;
6bc9a396 CL	206
	207	regs->regs[0] = (unsigned long) frame;
	208	regs->regs[3] = (unsigned long) frame->rs_code;
2bb12b77	209	regs->regs[4] = ksig->sig;
6bc9a396 CL	210	regs->regs[5] = (unsigned long) &frame->rs_info;
6bc9a396 CL	211	regs->regs[6] = (unsigned long) &frame->rs_uc;
2bb12b77 RW	212	regs->regs[29] = (unsigned long) ksig->ka.sa.sa_handler;
2bb12b77 RW	213	regs->cp0_epc = (unsigned long) ksig->ka.sa.sa_handler;
6bc9a396 CL	214
6bc9a396 CL	215	return 0;
6bc9a396 CL	216	}
6bc9a396 CL	217
2bb12b77	218	static void handle_signal(struct ksignal ksig, struct pt_regs regs)
6bc9a396	219	{
2bb12b77 RW	220	int ret;
2bb12b77 RW	221
6bc9a396 CL	222	if (regs->is_syscall) {
	223	switch (regs->regs[4]) {
	224	case ERESTART_RESTARTBLOCK:
	225	case ERESTARTNOHAND:
	226	regs->regs[4] = EINTR;
	227	break;
	228	case ERESTARTSYS:
2bb12b77	229	if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
6bc9a396 CL	230	regs->regs[4] = EINTR;
	231	break;
	232	}
	233	case ERESTARTNOINTR:
	234	regs->regs[4] = regs->orig_r4;
	235	regs->regs[7] = regs->orig_r7;
	236	regs->cp0_epc -= 8;
	237	}
	238
	239	regs->is_syscall = 0;
	240	}
	241
	242	/*
	243	* Set up the stack frame
	244	*/
2bb12b77	245	ret = setup_rt_frame(ksig, regs, sigmask_to_save());
6bc9a396	246
2bb12b77	247	signal_setup_done(ret, ksig, 0);
6bc9a396 CL	248	}
6bc9a396 CL	249
bddc6059	250	static void do_signal(struct pt_regs *regs)
6bc9a396	251	{
2bb12b77	252	struct ksignal ksig;
6bc9a396 CL	253
	254	/*
	255	* We want the common case to go fast, which is why we may in certain
	256	* cases get here from kernel mode. Just return without doing anything
	257	* if so.
	258	*/
	259	if (!user_mode(regs))
	260	return;
	261
2bb12b77	262	if (get_signal(&ksig)) {
6bc9a396	263	/* Actually deliver the signal. */
2bb12b77	264	handle_signal(&ksig, regs);
6bc9a396 CL	265	return;
	266	}
	267
	268	if (regs->is_syscall) {
	269	if (regs->regs[4] == ERESTARTNOHAND \|\|
	270	regs->regs[4] == ERESTARTSYS \|\|
	271	regs->regs[4] == ERESTARTNOINTR) {
	272	regs->regs[4] = regs->orig_r4;
	273	regs->regs[7] = regs->orig_r7;
	274	regs->cp0_epc -= 8;
	275	}
	276
	277	if (regs->regs[4] == ERESTART_RESTARTBLOCK) {
	278	regs->regs[27] = __NR_restart_syscall;
	279	regs->regs[4] = regs->orig_r4;
	280	regs->regs[7] = regs->orig_r7;
	281	regs->cp0_epc -= 8;
	282	}
	283
	284	regs->is_syscall = 0; /* Don't deal with this again. */
	285	}
	286
	287	/*
	288	* If there's no signal to deliver, we just put the saved sigmask
	289	* back
	290	*/
51a7b448	291	restore_saved_sigmask();
6bc9a396 CL	292	}
	293
	294	/*
	295	* notification of userspace execution resumption
	296	* - triggered by the TIF_WORK_MASK flags
	297	*/
	298	asmlinkage void do_notify_resume(struct pt_regs regs, void unused,
	299	__u32 thread_info_flags)
	300	{
	301	/* deal with pending signal delivery */
1d5d4dbe	302	if (thread_info_flags & _TIF_SIGPENDING)
6bc9a396	303	do_signal(regs);
1d5d4dbe AV	304	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
	305	clear_thread_flag(TIF_NOTIFY_RESUME);
	306	tracehook_notify_resume(regs);
1d5d4dbe	307	}
6bc9a396	308	}