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

/* signal.c: FRV specific bits of signal handling
 *
 * Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 * - Derived from arch/m68k/kernel/signal.c
 *
 * 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.
 */

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

#define DEBUG_SIG 0

struct fdpic_func_descriptor {
	unsigned long	text;
	unsigned long	GOT;
};

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

struct sigframe
{
	__sigrestore_t pretcode;
	int sig;
	struct sigcontext sc;
	unsigned long extramask[_NSIG_WORDS-1];
	uint32_t retcode[2];
};

struct rt_sigframe
{
	__sigrestore_t pretcode;
	int sig;
	struct siginfo __user *pinfo;
	void __user *puc;
	struct siginfo info;
	struct ucontext uc;
	uint32_t retcode[2];
};

static int restore_sigcontext(struct sigcontext __user *sc, int *_gr8)
{
	struct user_context *user = current->thread.user;
	unsigned long tbr, psr;

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

	tbr = user->i.tbr;
	psr = user->i.psr;
	if (copy_from_user(user, &sc->sc_context, sizeof(sc->sc_context)))
		goto badframe;
	user->i.tbr = tbr;
	user->i.psr = psr;

	restore_user_regs(user);

	user->i.syscallno = -1;		/* disable syscall checks */

	*_gr8 = user->i.gr[8];
	return 0;

 badframe:
	return 1;
}

asmlinkage int sys_sigreturn(void)
{
	struct sigframe __user *frame = (struct sigframe __user *) __frame->sp;
	sigset_t set;
	int gr8;

	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
		goto badframe;
	if (__get_user(set.sig[0], &frame->sc.sc_oldmask))
		goto badframe;

	if (_NSIG_WORDS > 1 &&
	    __copy_from_user(&set.sig[1], &frame->extramask, sizeof(frame->extramask)))
		goto badframe;

	set_current_blocked(&set);

	if (restore_sigcontext(&frame->sc, &gr8))
		goto badframe;
	return gr8;

 badframe:
	force_sig(SIGSEGV, current);
	return 0;
}

asmlinkage int sys_rt_sigreturn(void)
{
	struct rt_sigframe __user *frame = (struct rt_sigframe __user *) __frame->sp;
	sigset_t set;
	int gr8;

	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(&frame->uc.uc_mcontext, &gr8))
		goto badframe;

	if (restore_altstack(&frame->uc.uc_stack))
		goto badframe;

	return gr8;

badframe:
	force_sig(SIGSEGV, current);
	return 0;
}

/*
 * Set up a signal frame
 */
static int setup_sigcontext(struct sigcontext __user *sc, unsigned long mask)
{
	save_user_regs(current->thread.user);

	if (copy_to_user(&sc->sc_context, current->thread.user, sizeof(sc->sc_context)) != 0)
		goto badframe;

	/* non-iBCS2 extensions.. */
	if (__put_user(mask, &sc->sc_oldmask) < 0)
		goto badframe;

	return 0;

 badframe:
	return 1;
}

/*****************************************************************************/
/*
 * Determine which stack to use..
 */
static inline void __user *get_sigframe(struct ksignal *ksig,
					size_t frame_size)
{
	unsigned long sp = sigsp(__frame->sp, ksig);

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

} /* end get_sigframe() */

/*****************************************************************************/
/*
 *
 */
static int setup_frame(struct ksignal *ksig, sigset_t *set)
{
	struct sigframe __user *frame;
	int sig = ksig->sig;

	frame = get_sigframe(ksig, sizeof(*frame));

	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
		return -EFAULT;

	if (__put_user(sig, &frame->sig) < 0)
		return -EFAULT;

	if (setup_sigcontext(&frame->sc, set->sig[0]))
		return -EFAULT;

	if (_NSIG_WORDS > 1) {
		if (__copy_to_user(frame->extramask, &set->sig[1],
				   sizeof(frame->extramask)))
			return -EFAULT;
	}

	/* Set up to return from userspace.  If provided, use a stub
	 * already in userspace.  */
	if (ksig->ka.sa.sa_flags & SA_RESTORER) {
		if (__put_user(ksig->ka.sa.sa_restorer, &frame->pretcode) < 0)
			return -EFAULT;
	}
	else {
		/* Set up the following code on the stack:
		 *	setlos	#__NR_sigreturn,gr7
		 *	tira	gr0,0
		 */
		if (__put_user((__sigrestore_t)frame->retcode, &frame->pretcode) ||
		    __put_user(0x8efc0000|__NR_sigreturn, &frame->retcode[0]) ||
		    __put_user(0xc0700000, &frame->retcode[1]))
			return -EFAULT;

		flush_icache_range((unsigned long) frame->retcode,
				   (unsigned long) (frame->retcode + 2));
	}

	/* Set up registers for the signal handler */
	if (current->personality & FDPIC_FUNCPTRS) {
		struct fdpic_func_descriptor __user *funcptr =
			(struct fdpic_func_descriptor __user *) ksig->ka.sa.sa_handler;
		struct fdpic_func_descriptor desc;
		if (copy_from_user(&desc, funcptr, sizeof(desc)))
			return -EFAULT;
		__frame->pc = desc.text;
		__frame->gr15 = desc.GOT;
	} else {
		__frame->pc   = (unsigned long) ksig->ka.sa.sa_handler;
		__frame->gr15 = 0;
	}

	__frame->sp   = (unsigned long) frame;
	__frame->lr   = (unsigned long) &frame->retcode;
	__frame->gr8  = sig;

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

	return 0;
} /* end setup_frame() */

/*****************************************************************************/
/*
 *
 */
static int setup_rt_frame(struct ksignal *ksig, sigset_t *set)
{
	struct rt_sigframe __user *frame;
	int sig = ksig->sig;

	frame = get_sigframe(ksig, sizeof(*frame));

	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
		return -EFAULT;

	if (__put_user(sig,		&frame->sig) ||
	    __put_user(&frame->info,	&frame->pinfo) ||
	    __put_user(&frame->uc,	&frame->puc))
		return -EFAULT;

	if (copy_siginfo_to_user(&frame->info, &ksig->info))
		return -EFAULT;

	/* Create the ucontext.  */
	if (__put_user(0, &frame->uc.uc_flags) ||
	    __put_user(NULL, &frame->uc.uc_link) ||
	    __save_altstack(&frame->uc.uc_stack, __frame->sp))
		return -EFAULT;

	if (setup_sigcontext(&frame->uc.uc_mcontext, set->sig[0]))
		return -EFAULT;

	if (__copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)))
		return -EFAULT;

	/* Set up to return from userspace.  If provided, use a stub
	 * already in userspace.  */
	if (ksig->ka.sa.sa_flags & SA_RESTORER) {
		if (__put_user(ksig->ka.sa.sa_restorer, &frame->pretcode))
			return -EFAULT;
	}
	else {
		/* Set up the following code on the stack:
		 *	setlos	#__NR_sigreturn,gr7
		 *	tira	gr0,0
		 */
		if (__put_user((__sigrestore_t)frame->retcode, &frame->pretcode) ||
		    __put_user(0x8efc0000|__NR_rt_sigreturn, &frame->retcode[0]) ||
		    __put_user(0xc0700000, &frame->retcode[1]))
			return -EFAULT;

		flush_icache_range((unsigned long) frame->retcode,
				   (unsigned long) (frame->retcode + 2));
	}

	/* Set up registers for signal handler */
	if (current->personality & FDPIC_FUNCPTRS) {
		struct fdpic_func_descriptor __user *funcptr =
			(struct fdpic_func_descriptor __user *) ksig->ka.sa.sa_handler;
		struct fdpic_func_descriptor desc;
		if (copy_from_user(&desc, funcptr, sizeof(desc)))
			return -EFAULT;
		__frame->pc = desc.text;
		__frame->gr15 = desc.GOT;
	} else {
		__frame->pc   = (unsigned long) ksig->ka.sa.sa_handler;
		__frame->gr15 = 0;
	}

	__frame->sp  = (unsigned long) frame;
	__frame->lr  = (unsigned long) &frame->retcode;
	__frame->gr8 = sig;
	__frame->gr9 = (unsigned long) &frame->info;

#if DEBUG_SIG
	printk("SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
	       sig, current->comm, current->pid, frame, __frame->pc,
	       frame->pretcode);
#endif
	return 0;

} /* end setup_rt_frame() */

/*****************************************************************************/
/*
 * OK, we're invoking a handler
 */
static void handle_signal(struct ksignal *ksig)
{
	sigset_t *oldset = sigmask_to_save();
	int ret;

	/* Are we from a system call? */
	if (__frame->syscallno != -1) {
		/* If so, check system call restarting.. */
		switch (__frame->gr8) {
		case -ERESTART_RESTARTBLOCK:
		case -ERESTARTNOHAND:
			__frame->gr8 = -EINTR;
			break;

		case -ERESTARTSYS:
			if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
				__frame->gr8 = -EINTR;
				break;
			}

			/* fallthrough */
		case -ERESTARTNOINTR:
			__frame->gr8 = __frame->orig_gr8;
			__frame->pc -= 4;
		}
		__frame->syscallno = -1;
	}

	/* Set up the stack frame */
	if (ksig->ka.sa.sa_flags & SA_SIGINFO)
		ret = setup_rt_frame(ksig, oldset);
	else
		ret = setup_frame(ksig, oldset);

	signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
} /* end handle_signal() */

/*****************************************************************************/
/*
 * 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(void)
{
	struct ksignal ksig;

	if (get_signal(&ksig)) {
		handle_signal(&ksig);
		return;
	}

	/* Did we come from a system call? */
	if (__frame->syscallno != -1) {
		/* Restart the system call - no handlers present */
		switch (__frame->gr8) {
		case -ERESTARTNOHAND:
		case -ERESTARTSYS:
		case -ERESTARTNOINTR:
			__frame->gr8 = __frame->orig_gr8;
			__frame->pc -= 4;
			break;

		case -ERESTART_RESTARTBLOCK:
			__frame->gr7 = __NR_restart_syscall;
			__frame->pc -= 4;
			break;
		}
		__frame->syscallno = -1;
	}

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

/*****************************************************************************/
/*
 * notification of userspace execution resumption
 * - triggered by the TIF_WORK_MASK flags
 */
asmlinkage void do_notify_resume(__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();

	/* deal with notification on about to resume userspace execution */
	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
		clear_thread_flag(TIF_NOTIFY_RESUME);
		tracehook_notify_resume(__frame);
	}

} /* end do_notify_resume() */
Commit	Line	Data
1da177e4 LT	1	/* signal.c: FRV specific bits of signal handling
	2	*
	3	* Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
	4	* Written by David Howells (dhowells@redhat.com)
	5	* - Derived from arch/m68k/kernel/signal.c
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* as published by the Free Software Foundation; either version
	10	* 2 of the License, or (at your option) any later version.
	11	*/
	12
	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/ptrace.h>
	21	#include <linux/unistd.h>
	22	#include <linux/personality.h>
4a3b9893	23	#include <linux/tracehook.h>
1da177e4 LT	24	#include <asm/ucontext.h>
	25	#include <asm/uaccess.h>
	26	#include <asm/cacheflush.h>
	27
	28	#define DEBUG_SIG 0
	29
1da177e4 LT	30	struct fdpic_func_descriptor {
	31	unsigned long text;
	32	unsigned long GOT;
	33	};
	34
1da177e4 LT	35	/*
	36	* Do a signal return; undo the signal stack.
	37	*/
	38
	39	struct sigframe
	40	{
9e4d11f8	41	__sigrestore_t pretcode;
1da177e4 LT	42	int sig;
	43	struct sigcontext sc;
	44	unsigned long extramask[_NSIG_WORDS-1];
	45	uint32_t retcode[2];
	46	};
	47
	48	struct rt_sigframe
	49	{
9e4d11f8	50	__sigrestore_t pretcode;
1da177e4	51	int sig;
9e4d11f8 AV	52	struct siginfo __user *pinfo;
9e4d11f8 AV	53	void __user *puc;
1da177e4 LT	54	struct siginfo info;
	55	struct ucontext uc;
	56	uint32_t retcode[2];
	57	};
	58
	59	static int restore_sigcontext(struct sigcontext __user sc, int _gr8)
	60	{
	61	struct user_context *user = current->thread.user;
	62	unsigned long tbr, psr;
	63
20cd514d	64	/* Always make any pending restarted system calls return -EINTR */
f56141e3	65	current->restart_block.fn = do_no_restart_syscall;
20cd514d	66
1da177e4 LT	67	tbr = user->i.tbr;
	68	psr = user->i.psr;
	69	if (copy_from_user(user, &sc->sc_context, sizeof(sc->sc_context)))
	70	goto badframe;
	71	user->i.tbr = tbr;
	72	user->i.psr = psr;
	73
	74	restore_user_regs(user);
	75
	76	user->i.syscallno = -1; /* disable syscall checks */
	77
	78	*_gr8 = user->i.gr[8];
	79	return 0;
	80
	81	badframe:
	82	return 1;
	83	}
	84
	85	asmlinkage int sys_sigreturn(void)
	86	{
	87	struct sigframe __user frame = (struct sigframe __user ) __frame->sp;
	88	sigset_t set;
	89	int gr8;
	90
	91	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	92	goto badframe;
	93	if (__get_user(set.sig[0], &frame->sc.sc_oldmask))
	94	goto badframe;
	95
	96	if (_NSIG_WORDS > 1 &&
	97	__copy_from_user(&set.sig[1], &frame->extramask, sizeof(frame->extramask)))
	98	goto badframe;
	99
7ebe0c5d	100	set_current_blocked(&set);
1da177e4 LT	101
	102	if (restore_sigcontext(&frame->sc, &gr8))
	103	goto badframe;
	104	return gr8;
	105
	106	badframe:
	107	force_sig(SIGSEGV, current);
	108	return 0;
	109	}
	110
	111	asmlinkage int sys_rt_sigreturn(void)
	112	{
	113	struct rt_sigframe __user frame = (struct rt_sigframe __user ) __frame->sp;
	114	sigset_t set;
	115	int gr8;
	116
	117	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	118	goto badframe;
	119	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
	120	goto badframe;
	121
7ebe0c5d	122	set_current_blocked(&set);
1da177e4 LT	123
	124	if (restore_sigcontext(&frame->uc.uc_mcontext, &gr8))
	125	goto badframe;
	126
fe761416	127	if (restore_altstack(&frame->uc.uc_stack))
1da177e4 LT	128	goto badframe;
	129
	130	return gr8;
	131
	132	badframe:
	133	force_sig(SIGSEGV, current);
	134	return 0;
	135	}
	136
	137	/*
	138	* Set up a signal frame
	139	*/
	140	static int setup_sigcontext(struct sigcontext __user *sc, unsigned long mask)
	141	{
	142	save_user_regs(current->thread.user);
	143
	144	if (copy_to_user(&sc->sc_context, current->thread.user, sizeof(sc->sc_context)) != 0)
	145	goto badframe;
	146
	147	/* non-iBCS2 extensions.. */
	148	if (__put_user(mask, &sc->sc_oldmask) < 0)
	149	goto badframe;
	150
	151	return 0;
	152
	153	badframe:
	154	return 1;
	155	}
	156
	157	/*****************************************************************************/
	158	/*
	159	* Determine which stack to use..
	160	*/
4a03ac36	161	static inline void __user get_sigframe(struct ksignal ksig,
1da177e4 LT	162	size_t frame_size)
1da177e4 LT	163	{
4a03ac36	164	unsigned long sp = sigsp(__frame->sp, ksig);
1da177e4 LT	165
1da177e4 LT	166	return (void __user *) ((sp - frame_size) & ~7UL);
fef2b580	167
1da177e4 LT	168	} /* end get_sigframe() */
	169
	170	/*****************************************************************************/
	171	/*
	172	*
	173	*/
720f36b9	174	static int setup_frame(struct ksignal ksig, sigset_t set)
1da177e4 LT	175	{
1da177e4 LT	176	struct sigframe __user *frame;
7bd83010	177	int sig = ksig->sig;
1da177e4	178
4a03ac36	179	frame = get_sigframe(ksig, sizeof(*frame));
1da177e4 LT	180
1da177e4 LT	181	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
720f36b9	182	return -EFAULT;
1da177e4	183
7bd83010	184	if (__put_user(sig, &frame->sig) < 0)
720f36b9	185	return -EFAULT;
1da177e4 LT	186
1da177e4 LT	187	if (setup_sigcontext(&frame->sc, set->sig[0]))
720f36b9	188	return -EFAULT;
1da177e4 LT	189
	190	if (_NSIG_WORDS > 1) {
	191	if (__copy_to_user(frame->extramask, &set->sig[1],
	192	sizeof(frame->extramask)))
720f36b9	193	return -EFAULT;
1da177e4 LT	194	}
	195
	196	/* Set up to return from userspace. If provided, use a stub
	197	* already in userspace. */
720f36b9 RW	198	if (ksig->ka.sa.sa_flags & SA_RESTORER) {
	199	if (__put_user(ksig->ka.sa.sa_restorer, &frame->pretcode) < 0)
	200	return -EFAULT;
1da177e4 LT	201	}
	202	else {
	203	/* Set up the following code on the stack:
	204	* setlos #__NR_sigreturn,gr7
	205	* tira gr0,0
	206	*/
9e4d11f8	207	if (__put_user((__sigrestore_t)frame->retcode, &frame->pretcode) \|\|
1da177e4 LT	208	__put_user(0x8efc0000\|__NR_sigreturn, &frame->retcode[0]) \|\|
1da177e4 LT	209	__put_user(0xc0700000, &frame->retcode[1]))
720f36b9	210	return -EFAULT;
1da177e4 LT	211
	212	flush_icache_range((unsigned long) frame->retcode,
	213	(unsigned long) (frame->retcode + 2));
	214	}
	215
5f4ad04a	216	/* Set up registers for the signal handler */
ecd0fa98	217	if (current->personality & FDPIC_FUNCPTRS) {
1da177e4	218	struct fdpic_func_descriptor __user *funcptr =
720f36b9	219	(struct fdpic_func_descriptor __user *) ksig->ka.sa.sa_handler;
5f4ad04a AV	220	struct fdpic_func_descriptor desc;
5f4ad04a AV	221	if (copy_from_user(&desc, funcptr, sizeof(desc)))
720f36b9	222	return -EFAULT;
5f4ad04a AV	223	__frame->pc = desc.text;
5f4ad04a AV	224	__frame->gr15 = desc.GOT;
1da177e4	225	} else {
720f36b9	226	__frame->pc = (unsigned long) ksig->ka.sa.sa_handler;
fef2b580	227	__frame->gr15 = 0;
1da177e4 LT	228	}
1da177e4 LT	229
5f4ad04a AV	230	__frame->sp = (unsigned long) frame;
	231	__frame->lr = (unsigned long) &frame->retcode;
	232	__frame->gr8 = sig;
1da177e4 LT	233
	234	#if DEBUG_SIG
	235	printk("SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
fef2b580	236	sig, current->comm, current->pid, frame, __frame->pc,
8efc0ab5	237	frame->pretcode);
1da177e4 LT	238	#endif
1da177e4 LT	239
a411aee9	240	return 0;
1da177e4 LT	241	} /* end setup_frame() */
	242
	243	/*****************************************************************************/
	244	/*
	245	*
	246	*/
720f36b9	247	static int setup_rt_frame(struct ksignal ksig, sigset_t set)
1da177e4 LT	248	{
1da177e4 LT	249	struct rt_sigframe __user *frame;
7bd83010	250	int sig = ksig->sig;
1da177e4	251
4a03ac36	252	frame = get_sigframe(ksig, sizeof(*frame));
1da177e4 LT	253
1da177e4 LT	254	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
720f36b9	255	return -EFAULT;
1da177e4	256
7bd83010	257	if (__put_user(sig, &frame->sig) \|\|
1da177e4 LT	258	__put_user(&frame->info, &frame->pinfo) \|\|
1da177e4 LT	259	__put_user(&frame->uc, &frame->puc))
720f36b9	260	return -EFAULT;
1da177e4	261
720f36b9 RW	262	if (copy_siginfo_to_user(&frame->info, &ksig->info))
720f36b9 RW	263	return -EFAULT;
1da177e4 LT	264
	265	/* Create the ucontext. */
	266	if (__put_user(0, &frame->uc.uc_flags) \|\|
9e4d11f8	267	__put_user(NULL, &frame->uc.uc_link) \|\|
fe761416	268	__save_altstack(&frame->uc.uc_stack, __frame->sp))
720f36b9	269	return -EFAULT;
1da177e4 LT	270
1da177e4 LT	271	if (setup_sigcontext(&frame->uc.uc_mcontext, set->sig[0]))
720f36b9	272	return -EFAULT;
1da177e4 LT	273
1da177e4 LT	274	if (__copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)))
720f36b9	275	return -EFAULT;
1da177e4 LT	276
	277	/* Set up to return from userspace. If provided, use a stub
	278	* already in userspace. */
720f36b9 RW	279	if (ksig->ka.sa.sa_flags & SA_RESTORER) {
	280	if (__put_user(ksig->ka.sa.sa_restorer, &frame->pretcode))
	281	return -EFAULT;
1da177e4 LT	282	}
	283	else {
	284	/* Set up the following code on the stack:
	285	* setlos #__NR_sigreturn,gr7
	286	* tira gr0,0
	287	*/
9e4d11f8	288	if (__put_user((__sigrestore_t)frame->retcode, &frame->pretcode) \|\|
1da177e4 LT	289	__put_user(0x8efc0000\|__NR_rt_sigreturn, &frame->retcode[0]) \|\|
1da177e4 LT	290	__put_user(0xc0700000, &frame->retcode[1]))
720f36b9	291	return -EFAULT;
1da177e4 LT	292
	293	flush_icache_range((unsigned long) frame->retcode,
	294	(unsigned long) (frame->retcode + 2));
	295	}
	296
	297	/* Set up registers for signal handler */
ecd0fa98	298	if (current->personality & FDPIC_FUNCPTRS) {
9e4d11f8	299	struct fdpic_func_descriptor __user *funcptr =
720f36b9	300	(struct fdpic_func_descriptor __user *) ksig->ka.sa.sa_handler;
5f4ad04a AV	301	struct fdpic_func_descriptor desc;
5f4ad04a AV	302	if (copy_from_user(&desc, funcptr, sizeof(desc)))
720f36b9	303	return -EFAULT;
5f4ad04a AV	304	__frame->pc = desc.text;
5f4ad04a AV	305	__frame->gr15 = desc.GOT;
1da177e4	306	} else {
720f36b9	307	__frame->pc = (unsigned long) ksig->ka.sa.sa_handler;
fef2b580	308	__frame->gr15 = 0;
1da177e4 LT	309	}
1da177e4 LT	310
5f4ad04a AV	311	__frame->sp = (unsigned long) frame;
	312	__frame->lr = (unsigned long) &frame->retcode;
	313	__frame->gr8 = sig;
	314	__frame->gr9 = (unsigned long) &frame->info;
1da177e4 LT	315
	316	#if DEBUG_SIG
	317	printk("SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
fef2b580	318	sig, current->comm, current->pid, frame, __frame->pc,
8efc0ab5	319	frame->pretcode);
1da177e4	320	#endif
a411aee9	321	return 0;
1da177e4	322
1da177e4 LT	323	} /* end setup_rt_frame() */
	324
	325	/*****************************************************************************/
	326	/*
	327	* OK, we're invoking a handler
	328	*/
720f36b9	329	static void handle_signal(struct ksignal *ksig)
1da177e4	330	{
b7f9a11a	331	sigset_t *oldset = sigmask_to_save();
8efc0ab5 DH	332	int ret;
8efc0ab5 DH	333
1da177e4	334	/* Are we from a system call? */
ed1cde68	335	if (__frame->syscallno != -1) {
1da177e4	336	/* If so, check system call restarting.. */
fef2b580	337	switch (__frame->gr8) {
1da177e4 LT	338	case -ERESTART_RESTARTBLOCK:
1da177e4 LT	339	case -ERESTARTNOHAND:
fef2b580	340	__frame->gr8 = -EINTR;
1da177e4 LT	341	break;
	342
	343	case -ERESTARTSYS:
720f36b9	344	if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
fef2b580	345	__frame->gr8 = -EINTR;
1da177e4 LT	346	break;
1da177e4 LT	347	}
8efc0ab5	348
1da177e4 LT	349	/* fallthrough */
1da177e4 LT	350	case -ERESTARTNOINTR:
fef2b580 DH	351	__frame->gr8 = __frame->orig_gr8;
fef2b580 DH	352	__frame->pc -= 4;
1da177e4	353	}
ed1cde68	354	__frame->syscallno = -1;
1da177e4 LT	355	}
	356
	357	/* Set up the stack frame */
720f36b9 RW	358	if (ksig->ka.sa.sa_flags & SA_SIGINFO)
720f36b9 RW	359	ret = setup_rt_frame(ksig, oldset);
1da177e4	360	else
720f36b9	361	ret = setup_frame(ksig, oldset);
1da177e4	362
720f36b9	363	signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
1da177e4 LT	364	} /* end handle_signal() */
	365
	366	/*****************************************************************************/
	367	/*
	368	* Note that 'init' is a special process: it doesn't get signals it doesn't
	369	* want to handle. Thus you cannot kill init even with a SIGKILL even by
	370	* mistake.
	371	*/
a411aee9	372	static void do_signal(void)
1da177e4	373	{
720f36b9	374	struct ksignal ksig;
1da177e4	375
720f36b9 RW	376	if (get_signal(&ksig)) {
720f36b9 RW	377	handle_signal(&ksig);
a411aee9 DH	378	return;
a411aee9 DH	379	}
1da177e4	380
1da177e4	381	/* Did we come from a system call? */
c896a2e0	382	if (__frame->syscallno != -1) {
1da177e4	383	/* Restart the system call - no handlers present */
a411aee9 DH	384	switch (__frame->gr8) {
	385	case -ERESTARTNOHAND:
	386	case -ERESTARTSYS:
	387	case -ERESTARTNOINTR:
fef2b580 DH	388	__frame->gr8 = __frame->orig_gr8;
fef2b580 DH	389	__frame->pc -= 4;
a411aee9	390	break;
1da177e4	391
a411aee9	392	case -ERESTART_RESTARTBLOCK:
44c7afff	393	__frame->gr7 = __NR_restart_syscall;
fef2b580	394	__frame->pc -= 4;
a411aee9	395	break;
1da177e4	396	}
ed1cde68	397	__frame->syscallno = -1;
1da177e4 LT	398	}
1da177e4 LT	399
a411aee9 DH	400	/* if there's no signal to deliver, we just put the saved sigmask
a411aee9 DH	401	* back */
51a7b448	402	restore_saved_sigmask();
1da177e4 LT	403	} /* end do_signal() */
	404
	405	/*****************************************************************************/
	406	/*
	407	* notification of userspace execution resumption
a411aee9	408	* - triggered by the TIF_WORK_MASK flags
1da177e4 LT	409	*/
	410	asmlinkage void do_notify_resume(__u32 thread_info_flags)
	411	{
	412	/* pending single-step? */
	413	if (thread_info_flags & _TIF_SINGLESTEP)
	414	clear_thread_flag(TIF_SINGLESTEP);
	415
	416	/* deal with pending signal delivery */
a3936249	417	if (thread_info_flags & _TIF_SIGPENDING)
a411aee9	418	do_signal();
1da177e4	419
b7bab880 DH	420	/* deal with notification on about to resume userspace execution */
	421	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
	422	clear_thread_flag(TIF_NOTIFY_RESUME);
4a3b9893	423	tracehook_notify_resume(__frame);
b7bab880 DH	424	}
b7bab880 DH	425
1da177e4	426	} /* end do_notify_resume() */