[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_sigaltstack(struct pt_regs *regs)
{
	const stack_t __user *uss = (const stack_t __user *) regs->regs[4];
	stack_t __user *uoss = (stack_t __user *) regs->regs[5];
	unsigned long usp = regs->regs[0];

	return do_sigaltstack(uss, uoss, usp);
}

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

	/* Always make any pending restarted system calls return -EINTR */
	current_thread_info()->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 (__copy_from_user(&st, &frame->rs_uc.uc_stack, sizeof(st)))
		goto badframe;

	/* It is more difficult to avoid calling this function than to
	   call it and ignore errors.  */
	do_sigaltstack((stack_t __user *)&st, NULL, regs->regs[0]);
	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 k_sigaction *ka, struct pt_regs *regs,
		int signr, sigset_t *set, siginfo_t *info)
{
	struct rt_sigframe __user *frame;
	int err = 0;

	frame = get_sigframe(ka, regs, sizeof(*frame));
	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
		goto give_sigsegv;

	/*
	 * 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, info);
	err |= __put_user(0, &frame->rs_uc.uc_flags);
	err |= __put_user(NULL, &frame->rs_uc.uc_link);
	err |= __put_user((void __user *)current->sas_ss_sp,
				&frame->rs_uc.uc_stack.ss_sp);
	err |= __put_user(sas_ss_flags(regs->regs[0]),
				&frame->rs_uc.uc_stack.ss_flags);
	err |= __put_user(current->sas_ss_size,
				&frame->rs_uc.uc_stack.ss_size);
	err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
	err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));

	if (err)
		goto give_sigsegv;

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

	return 0;

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

static void handle_signal(unsigned long sig, siginfo_t *info,
	struct k_sigaction *ka, struct pt_regs *regs)
{
	if (regs->is_syscall) {
		switch (regs->regs[4]) {
		case ERESTART_RESTARTBLOCK:
		case ERESTARTNOHAND:
			regs->regs[4] = EINTR;
			break;
		case ERESTARTSYS:
			if (!(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
	 */
	if (setup_rt_frame(ka, regs, sig, sigmask_to_save(), info) < 0)
		return;

	signal_delivered(sig, info, ka, regs, 0);
}

static void do_signal(struct pt_regs *regs)
{
	struct k_sigaction ka;
	siginfo_t info;
	int signr;

	/*
	 * 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) {
		/* Actually deliver the signal.  */
		handle_signal(signr, &info, &ka, 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_sigaltstack(struct pt_regs *regs)
6bc9a396	138	{
a1f8213b AB	139	const stack_t __user uss = (const stack_t __user ) regs->regs[4];
a1f8213b AB	140	stack_t __user uoss = (stack_t __user ) regs->regs[5];
6bc9a396 CL	141	unsigned long usp = regs->regs[0];
	142
	143	return do_sigaltstack(uss, uoss, usp);
	144	}
	145
bddc6059 AB	146	asmlinkage long
bddc6059 AB	147	score_rt_sigreturn(struct pt_regs *regs)
6bc9a396 CL	148	{
	149	struct rt_sigframe __user *frame;
	150	sigset_t set;
	151	stack_t st;
	152	int sig;
	153
f2ccfb3e AV	154	/* Always make any pending restarted system calls return -EINTR */
	155	current_thread_info()->restart_block.fn = do_no_restart_syscall;
	156
6bc9a396 CL	157	frame = (struct rt_sigframe __user *) regs->regs[0];
	158	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	159	goto badframe;
	160	if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
	161	goto badframe;
	162
4c3181bd	163	set_current_blocked(&set);
6bc9a396 CL	164
	165	sig = restore_sigcontext(regs, &frame->rs_uc.uc_mcontext);
	166	if (sig < 0)
	167	goto badframe;
	168	else if (sig)
	169	force_sig(sig, current);
	170
	171	if (__copy_from_user(&st, &frame->rs_uc.uc_stack, sizeof(st)))
	172	goto badframe;
	173
	174	/* It is more difficult to avoid calling this function than to
	175	call it and ignore errors. */
	176	do_sigaltstack((stack_t __user *)&st, NULL, regs->regs[0]);
af445f45	177	regs->is_syscall = 0;
6bc9a396 CL	178
	179	__asm__ __volatile__(
	180	"mv\tr0, %0\n\t"
	181	"la\tr8, syscall_exit\n\t"
	182	"br\tr8\n\t"
	183	: : "r" (regs) : "r8");
	184
	185	badframe:
	186	force_sig(SIGSEGV, current);
bddc6059 AB	187
bddc6059 AB	188	return 0;
6bc9a396 CL	189	}
6bc9a396 CL	190
bddc6059	191	static int setup_rt_frame(struct k_sigaction ka, struct pt_regs regs,
6bc9a396 CL	192	int signr, sigset_t set, siginfo_t info)
6bc9a396 CL	193	{
a1f8213b	194	struct rt_sigframe __user *frame;
6bc9a396 CL	195	int err = 0;
	196
	197	frame = get_sigframe(ka, regs, sizeof(*frame));
	198	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	199	goto give_sigsegv;
	200
	201	/*
	202	* Set up the return code ...
	203	*
	204	* li v0, __NR_rt_sigreturn
	205	* syscall
	206	*/
	207	err \|= __put_user(0x87788000 + __NR_rt_sigreturn*2,
	208	frame->rs_code + 0);
	209	err \|= __put_user(0x80008002, frame->rs_code + 1);
	210	flush_cache_sigtramp((unsigned long) frame->rs_code);
	211
	212	err \|= copy_siginfo_to_user(&frame->rs_info, info);
	213	err \|= __put_user(0, &frame->rs_uc.uc_flags);
c6067472	214	err \|= __put_user(NULL, &frame->rs_uc.uc_link);
a1f8213b	215	err \|= __put_user((void __user *)current->sas_ss_sp,
6bc9a396 CL	216	&frame->rs_uc.uc_stack.ss_sp);
	217	err \|= __put_user(sas_ss_flags(regs->regs[0]),
	218	&frame->rs_uc.uc_stack.ss_flags);
	219	err \|= __put_user(current->sas_ss_size,
	220	&frame->rs_uc.uc_stack.ss_size);
	221	err \|= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
	222	err \|= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
	223
	224	if (err)
	225	goto give_sigsegv;
	226
	227	regs->regs[0] = (unsigned long) frame;
	228	regs->regs[3] = (unsigned long) frame->rs_code;
	229	regs->regs[4] = signr;
	230	regs->regs[5] = (unsigned long) &frame->rs_info;
	231	regs->regs[6] = (unsigned long) &frame->rs_uc;
	232	regs->regs[29] = (unsigned long) ka->sa.sa_handler;
	233	regs->cp0_epc = (unsigned long) ka->sa.sa_handler;
	234
	235	return 0;
	236
	237	give_sigsegv:
cf4a0ce4	238	force_sigsegv(signr, current);
6bc9a396 CL	239	return -EFAULT;
	240	}
	241
a610d6e6	242	static void handle_signal(unsigned long sig, siginfo_t *info,
b7f9a11a	243	struct k_sigaction ka, struct pt_regs regs)
6bc9a396	244	{
6bc9a396 CL	245	if (regs->is_syscall) {
	246	switch (regs->regs[4]) {
	247	case ERESTART_RESTARTBLOCK:
	248	case ERESTARTNOHAND:
	249	regs->regs[4] = EINTR;
	250	break;
	251	case ERESTARTSYS:
	252	if (!(ka->sa.sa_flags & SA_RESTART)) {
	253	regs->regs[4] = EINTR;
	254	break;
	255	}
	256	case ERESTARTNOINTR:
	257	regs->regs[4] = regs->orig_r4;
	258	regs->regs[7] = regs->orig_r7;
	259	regs->cp0_epc -= 8;
	260	}
	261
	262	regs->is_syscall = 0;
	263	}
	264
	265	/*
	266	* Set up the stack frame
	267	*/
a610d6e6 AV	268	if (setup_rt_frame(ka, regs, sig, sigmask_to_save(), info) < 0)
a610d6e6 AV	269	return;
6bc9a396	270
efee984c	271	signal_delivered(sig, info, ka, regs, 0);
6bc9a396 CL	272	}
6bc9a396 CL	273
bddc6059	274	static void do_signal(struct pt_regs *regs)
6bc9a396 CL	275	{
6bc9a396 CL	276	struct k_sigaction ka;
6bc9a396 CL	277	siginfo_t info;
	278	int signr;
	279
	280	/*
	281	* We want the common case to go fast, which is why we may in certain
	282	* cases get here from kernel mode. Just return without doing anything
	283	* if so.
	284	*/
	285	if (!user_mode(regs))
	286	return;
	287
6bc9a396 CL	288	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
	289	if (signr > 0) {
	290	/* Actually deliver the signal. */
a610d6e6	291	handle_signal(signr, &info, &ka, regs);
6bc9a396 CL	292	return;
	293	}
	294
	295	if (regs->is_syscall) {
	296	if (regs->regs[4] == ERESTARTNOHAND \|\|
	297	regs->regs[4] == ERESTARTSYS \|\|
	298	regs->regs[4] == ERESTARTNOINTR) {
	299	regs->regs[4] = regs->orig_r4;
	300	regs->regs[7] = regs->orig_r7;
	301	regs->cp0_epc -= 8;
	302	}
	303
	304	if (regs->regs[4] == ERESTART_RESTARTBLOCK) {
	305	regs->regs[27] = __NR_restart_syscall;
	306	regs->regs[4] = regs->orig_r4;
	307	regs->regs[7] = regs->orig_r7;
	308	regs->cp0_epc -= 8;
	309	}
	310
	311	regs->is_syscall = 0; /* Don't deal with this again. */
	312	}
	313
	314	/*
	315	* If there's no signal to deliver, we just put the saved sigmask
	316	* back
	317	*/
51a7b448	318	restore_saved_sigmask();
6bc9a396 CL	319	}
	320
	321	/*
	322	* notification of userspace execution resumption
	323	* - triggered by the TIF_WORK_MASK flags
	324	*/
	325	asmlinkage void do_notify_resume(struct pt_regs regs, void unused,
	326	__u32 thread_info_flags)
	327	{
	328	/* deal with pending signal delivery */
1d5d4dbe	329	if (thread_info_flags & _TIF_SIGPENDING)
6bc9a396	330	do_signal(regs);
1d5d4dbe AV	331	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
	332	clear_thread_flag(TIF_NOTIFY_RESUME);
	333	tracehook_notify_resume(regs);
1d5d4dbe	334	}
6bc9a396	335	}