[net-next-2.6.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)))

int do_signal(struct pt_regs *, sigset_t *);

asmlinkage int
sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize,
		  unsigned long r2, unsigned long r3, unsigned long r4,
		  unsigned long r5, unsigned long r6, struct pt_regs *regs)
{
	sigset_t newset;

	/* XXX: Don't preclude handling different sized sigset_t's.  */
	if (sigsetsize != sizeof(sigset_t))
		return -EINVAL;

	if (copy_from_user(&newset, unewset, sizeof(newset)))
		return -EFAULT;
	sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));

	spin_lock_irq(&current->sighand->siglock);
	current->saved_sigmask = current->blocked;
	current->blocked = newset;
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	current->state = TASK_INTERRUPTIBLE;
	schedule();
	set_thread_flag(TIF_RESTORE_SIGMASK);
	return -ERESTARTNOHAND;
}

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);
	spin_lock_irq(&current->sighand->siglock);
	current->blocked = set;
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	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 void 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;

give_sigsegv:
	force_sigsegv(sig, current);
}

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

static void
handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
	      sigset_t *oldset, struct pt_regs *regs)
{
	unsigned short inst;

	/* 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;
				inst = *(unsigned short *)(regs->bpc - 2);
				if ((inst & 0xfff0) == 0x10f0)	/* trap ? */
					regs->bpc -= 2;
				else
					regs->bpc -= 4;
		}
	}

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

	spin_lock_irq(&current->sighand->siglock);
	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
	if (!(ka->sa.sa_flags & SA_NODEFER))
		sigaddset(&current->blocked,sig);
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);
}

/*
 * 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.
 */
int do_signal(struct pt_regs *regs, sigset_t *oldset)
{
	siginfo_t info;
	int signr;
	struct k_sigaction ka;
	unsigned short inst;

	/*
	 * 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 1;

	if (try_to_freeze()) 
		goto no_signal;

	if (!oldset)
		oldset = &current->blocked;

	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, oldset, regs);
		return 1;
	}

 no_signal:
	/* 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;
			inst = *(unsigned short *)(regs->bpc - 2);
			if ((inst & 0xfff0) == 0x10f0)	/* trap ? */
				regs->bpc -= 2;
			else
				regs->bpc -= 4;
		}
		if (regs->r0 == -ERESTART_RESTARTBLOCK){
			regs->r0 = regs->orig_r0;
			regs->r7 = __NR_restart_syscall;
			inst = *(unsigned short *)(regs->bpc - 2);
			if ((inst & 0xfff0) == 0x10f0)	/* trap ? */
				regs->bpc -= 2;
			else
				regs->bpc -= 4;
		}
	}
	return 0;
}

/*
 * notification of userspace execution resumption
 * - triggered by current->work.notify_resume
 */
void do_notify_resume(struct pt_regs *regs, sigset_t *oldset,
		      __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,oldset);

	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
		clear_thread_flag(TIF_NOTIFY_RESUME);
		tracehook_notify_resume(regs);
		if (current->replacement_session_keyring)
			key_replace_session_keyring();
	}

	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
	31	#define _BLOCKABLE (~(sigmask(SIGKILL) \| sigmask(SIGSTOP)))
	32
	33	int do_signal(struct pt_regs , sigset_t );
	34
	35	asmlinkage int
870e75a2	36	sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize,
1da177e4	37	unsigned long r2, unsigned long r3, unsigned long r4,
6ced13cd	38	unsigned long r5, unsigned long r6, struct pt_regs *regs)
1da177e4	39	{
c37a3303	40	sigset_t newset;
1da177e4 LT	41
	42	/* XXX: Don't preclude handling different sized sigset_t's. */
	43	if (sigsetsize != sizeof(sigset_t))
	44	return -EINVAL;
	45
	46	if (copy_from_user(&newset, unewset, sizeof(newset)))
	47	return -EFAULT;
c37a3303	48	sigdelsetmask(&newset, sigmask(SIGKILL)\|sigmask(SIGSTOP));
1da177e4 LT	49
1da177e4 LT	50	spin_lock_irq(&current->sighand->siglock);
c37a3303	51	current->saved_sigmask = current->blocked;
1da177e4 LT	52	current->blocked = newset;
	53	recalc_sigpending();
	54	spin_unlock_irq(&current->sighand->siglock);
	55
c37a3303 HT	56	current->state = TASK_INTERRUPTIBLE;
	57	schedule();
	58	set_thread_flag(TIF_RESTORE_SIGMASK);
	59	return -ERESTARTNOHAND;
1da177e4 LT	60	}
	61
	62	asmlinkage int
	63	sys_sigaltstack(const stack_t __user uss, stack_t __user uoss,
	64	unsigned long r2, unsigned long r3, unsigned long r4,
6ced13cd	65	unsigned long r5, unsigned long r6, struct pt_regs *regs)
1da177e4	66	{
6ced13cd	67	return do_sigaltstack(uss, uoss, regs->spu);
1da177e4 LT	68	}
	69
	70
	71	/*
	72	* Do a signal return; undo the signal stack.
	73	*/
	74
	75	struct rt_sigframe
	76	{
	77	int sig;
870e75a2 AV	78	struct siginfo __user *pinfo;
870e75a2 AV	79	void __user *puc;
1da177e4 LT	80	struct siginfo info;
	81	struct ucontext uc;
	82	// struct _fpstate fpstate;
	83	};
	84
	85	static int
	86	restore_sigcontext(struct pt_regs regs, struct sigcontext __user sc,
	87	int *r0_p)
	88	{
	89	unsigned int err = 0;
	90
	91	/* Always make any pending restarted system calls return -EINTR */
	92	current_thread_info()->restart_block.fn = do_no_restart_syscall;
	93
	94	#define COPY(x) err \|= __get_user(regs->x, &sc->sc_##x)
	95	COPY(r4);
	96	COPY(r5);
	97	COPY(r6);
	98	COPY(pt_regs);
	99	/* COPY(r0); Skip r0 */
	100	COPY(r1);
	101	COPY(r2);
	102	COPY(r3);
	103	COPY(r7);
	104	COPY(r8);
	105	COPY(r9);
	106	COPY(r10);
	107	COPY(r11);
	108	COPY(r12);
1da177e4 LT	109	COPY(acc0h);
1da177e4 LT	110	COPY(acc0l);
9674dcf7 HT	111	COPY(acc1h); /* ISA_DSP_LEVEL2 only */
9674dcf7 HT	112	COPY(acc1l); /* ISA_DSP_LEVEL2 only */
1da177e4 LT	113	COPY(psw);
	114	COPY(bpc);
	115	COPY(bbpsw);
	116	COPY(bbpc);
	117	COPY(spu);
	118	COPY(fp);
	119	COPY(lr);
	120	COPY(spi);
	121	#undef COPY
	122
	123	regs->syscall_nr = -1; /* disable syscall checks */
	124	err \|= __get_user(*r0_p, &sc->sc_r0);
	125
	126	return err;
	127	}
	128
	129	asmlinkage int
	130	sys_rt_sigreturn(unsigned long r0, unsigned long r1,
	131	unsigned long r2, unsigned long r3, unsigned long r4,
6ced13cd	132	unsigned long r5, unsigned long r6, struct pt_regs *regs)
1da177e4	133	{
6ced13cd	134	struct rt_sigframe __user frame = (struct rt_sigframe __user )regs->spu;
1da177e4	135	sigset_t set;
1da177e4 LT	136	int result;
	137
	138	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	139	goto badframe;
	140	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
	141	goto badframe;
	142
	143	sigdelsetmask(&set, ~_BLOCKABLE);
	144	spin_lock_irq(&current->sighand->siglock);
	145	current->blocked = set;
	146	recalc_sigpending();
	147	spin_unlock_irq(&current->sighand->siglock);
	148
6ced13cd	149	if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &result))
1da177e4 LT	150	goto badframe;
1da177e4 LT	151
6ced13cd	152	if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->spu) == -EFAULT)
1da177e4	153	goto badframe;
1da177e4 LT	154
	155	return result;
	156
	157	badframe:
	158	force_sig(SIGSEGV, current);
	159	return 0;
	160	}
	161
	162	/*
	163	* Set up a signal frame.
	164	*/
	165
	166	static int
	167	setup_sigcontext(struct sigcontext __user sc, struct pt_regs regs,
	168	unsigned long mask)
	169	{
	170	int err = 0;
	171
	172	#define COPY(x) err \|= __put_user(regs->x, &sc->sc_##x)
	173	COPY(r4);
	174	COPY(r5);
	175	COPY(r6);
	176	COPY(pt_regs);
	177	COPY(r0);
	178	COPY(r1);
	179	COPY(r2);
	180	COPY(r3);
	181	COPY(r7);
	182	COPY(r8);
	183	COPY(r9);
	184	COPY(r10);
	185	COPY(r11);
	186	COPY(r12);
1da177e4 LT	187	COPY(acc0h);
1da177e4 LT	188	COPY(acc0l);
9674dcf7 HT	189	COPY(acc1h); /* ISA_DSP_LEVEL2 only */
9674dcf7 HT	190	COPY(acc1l); /* ISA_DSP_LEVEL2 only */
1da177e4 LT	191	COPY(psw);
	192	COPY(bpc);
	193	COPY(bbpsw);
	194	COPY(bbpc);
	195	COPY(spu);
	196	COPY(fp);
	197	COPY(lr);
	198	COPY(spi);
	199	#undef COPY
	200
	201	err \|= __put_user(mask, &sc->oldmask);
	202
	203	return err;
	204	}
	205
	206	/*
	207	* Determine which stack to use..
	208	*/
	209	static inline void __user *
	210	get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
	211	{
	212	/* This is the X/Open sanctioned signal stack switching. */
	213	if (ka->sa.sa_flags & SA_ONSTACK) {
	214	if (sas_ss_flags(sp) == 0)
	215	sp = current->sas_ss_sp + current->sas_ss_size;
	216	}
	217
	218	return (void __user *)((sp - frame_size) & -8ul);
	219	}
	220
	221	static void setup_rt_frame(int sig, struct k_sigaction ka, siginfo_t info,
	222	sigset_t set, struct pt_regs regs)
	223	{
	224	struct rt_sigframe __user *frame;
	225	int err = 0;
	226	int signal;
	227
	228	frame = get_sigframe(ka, regs->spu, sizeof(*frame));
	229
	230	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	231	goto give_sigsegv;
	232
	233	signal = current_thread_info()->exec_domain
	234	&& current_thread_info()->exec_domain->signal_invmap
	235	&& sig < 32
	236	? current_thread_info()->exec_domain->signal_invmap[sig]
	237	: sig;
	238
	239	err \|= __put_user(signal, &frame->sig);
	240	if (err)
	241	goto give_sigsegv;
	242
	243	err \|= __put_user(&frame->info, &frame->pinfo);
	244	err \|= __put_user(&frame->uc, &frame->puc);
	245	err \|= copy_siginfo_to_user(&frame->info, info);
	246	if (err)
	247	goto give_sigsegv;
	248
	249	/* Create the ucontext. */
	250	err \|= __put_user(0, &frame->uc.uc_flags);
	251	err \|= __put_user(0, &frame->uc.uc_link);
	252	err \|= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
	253	err \|= __put_user(sas_ss_flags(regs->spu),
	254	&frame->uc.uc_stack.ss_flags);
255	err \|= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
256	err \|= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
257	err \|= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
258	if (err)
259	goto give_sigsegv;
260
261	/* Set up to return from userspace. */
262	regs->lr = (unsigned long)ka->sa.sa_restorer;
263
264	/* Set up registers for signal handler */
265	regs->spu = (unsigned long)frame;
266	regs->r0 = signal; /* Arg for signal handler */
267	regs->r1 = (unsigned long)&frame->info;
268	regs->r2 = (unsigned long)&frame->uc;
269	regs->bpc = (unsigned long)ka->sa.sa_handler;
270
271	set_fs(USER_DS);
272
273	#if DEBUG_SIG
274	printk("SIG deliver (%s:%d): sp=%p pc=%p\n",
275	current->comm, current->pid, frame, regs->pc);
276	#endif
277
278	return;
279
280	give_sigsegv:
281	force_sigsegv(sig, current);
282	}
283
284	/*
285	* OK, we're invoking a handler
286	*/
287
288	static void
289	handle_signal(unsigned long sig, struct k_sigaction ka, siginfo_t info,
290	sigset_t oldset, struct pt_regs regs)
291	{
292	unsigned short inst;
293
294	/* Are we from a system call? */
295	if (regs->syscall_nr >= 0) {
296	/* If so, check system call restarting.. */
297	switch (regs->r0) {
298	case -ERESTART_RESTARTBLOCK:
299	case -ERESTARTNOHAND:
300	regs->r0 = -EINTR;
301	break;
302
303	case -ERESTARTSYS:
304	if (!(ka->sa.sa_flags & SA_RESTART)) {
305	regs->r0 = -EINTR;
306	break;
307	}
308	/* fallthrough */
309	case -ERESTARTNOINTR:
310	regs->r0 = regs->orig_r0;
311	inst = (unsigned short )(regs->bpc - 2);
312	if ((inst & 0xfff0) == 0x10f0) /* trap ? */
313	regs->bpc -= 2;
314	else
315	regs->bpc -= 4;
316	}
317	}
318
319	/* Set up the stack frame */
320	setup_rt_frame(sig, ka, info, oldset, regs);
321
69be8f18 SR	322	spin_lock_irq(&current->sighand->siglock);
	323	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
	324	if (!(ka->sa.sa_flags & SA_NODEFER))
1da177e4	325	sigaddset(&current->blocked,sig);
69be8f18 SR	326	recalc_sigpending();
69be8f18 SR	327	spin_unlock_irq(&current->sighand->siglock);
1da177e4 LT	328	}
	329
	330	/*
	331	* Note that 'init' is a special process: it doesn't get signals it doesn't
	332	* want to handle. Thus you cannot kill init even with a SIGKILL even by
	333	* mistake.
	334	*/
	335	int do_signal(struct pt_regs regs, sigset_t oldset)
	336	{
	337	siginfo_t info;
	338	int signr;
	339	struct k_sigaction ka;
	340	unsigned short inst;
	341
	342	/*
	343	* We want the common case to go fast, which
	344	* is why we may in certain cases get here from
	345	* kernel mode. Just return without doing anything
	346	* if so.
	347	*/
	348	if (!user_mode(regs))
	349	return 1;
	350
3e1d1d28	351	if (try_to_freeze())
1da177e4	352	goto no_signal;
1da177e4 LT	353
	354	if (!oldset)
	355	oldset = &current->blocked;
	356
	357	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
	358	if (signr > 0) {
5aa8b6c1	359	/* Re-enable any watchpoints before delivering the
1da177e4 LT	360	* signal to user space. The processor register will
	361	* have been cleared if the watchpoint triggered
	362	* inside the kernel.
	363	*/
	364
	365	/* Whee! Actually deliver the signal. */
	366	handle_signal(signr, &ka, &info, oldset, regs);
	367	return 1;
	368	}
	369
	370	no_signal:
	371	/* Did we come from a system call? */
	372	if (regs->syscall_nr >= 0) {
	373	/* Restart the system call - no handlers present */
	374	if (regs->r0 == -ERESTARTNOHAND \|\|
	375	regs->r0 == -ERESTARTSYS \|\|
	376	regs->r0 == -ERESTARTNOINTR) {
	377	regs->r0 = regs->orig_r0;
	378	inst = (unsigned short )(regs->bpc - 2);
	379	if ((inst & 0xfff0) == 0x10f0) /* trap ? */
	380	regs->bpc -= 2;
	381	else
	382	regs->bpc -= 4;
	383	}
	384	if (regs->r0 == -ERESTART_RESTARTBLOCK){
	385	regs->r0 = regs->orig_r0;
	386	regs->r7 = __NR_restart_syscall;
	387	inst = (unsigned short )(regs->bpc - 2);
	388	if ((inst & 0xfff0) == 0x10f0) /* trap ? */
	389	regs->bpc -= 2;
	390	else
	391	regs->bpc -= 4;
	392	}
	393	}
	394	return 0;
	395	}
	396
	397	/*
	398	* notification of userspace execution resumption
	399	* - triggered by current->work.notify_resume
	400	*/
	401	void do_notify_resume(struct pt_regs regs, sigset_t oldset,
	402	__u32 thread_info_flags)
	403	{
	404	/* Pending single-step? */
	405	if (thread_info_flags & _TIF_SINGLESTEP)
	406	clear_thread_flag(TIF_SINGLESTEP);
	407
	408	/* deal with pending signal delivery */
	409	if (thread_info_flags & _TIF_SIGPENDING)
	410	do_signal(regs,oldset);
	411
d0420c83 DH	412	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
	413	clear_thread_flag(TIF_NOTIFY_RESUME);
	414	tracehook_notify_resume(regs);
ee18d64c DH	415	if (current->replacement_session_keyring)
ee18d64c DH	416	key_replace_session_keyring();
d0420c83 DH	417	}
d0420c83 DH	418
1da177e4 LT	419	clear_thread_flag(TIF_IRET);
1da177e4 LT	420	}