[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_thread_info()->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 k_sigaction *ka,
					size_t frame_size)
{
	unsigned long sp;

	/* Default to using normal stack */
	sp = __frame->sp;

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

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

} /* end get_sigframe() */

/*****************************************************************************/
/*
 *
 */
static int setup_frame(int sig, struct k_sigaction *ka, sigset_t *set)
{
	struct sigframe __user *frame;
	int rsig;

	set_fs(USER_DS);

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

	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
		goto give_sigsegv;

	rsig = sig;
	if (sig < 32 &&
	    __current_thread_info->exec_domain &&
	    __current_thread_info->exec_domain->signal_invmap)
		rsig = __current_thread_info->exec_domain->signal_invmap[sig];

	if (__put_user(rsig, &frame->sig) < 0)
		goto give_sigsegv;

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

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

	/* Set up to return from userspace.  If provided, use a stub
	 * already in userspace.  */
	if (ka->sa.sa_flags & SA_RESTORER) {
		if (__put_user(ka->sa.sa_restorer, &frame->pretcode) < 0)
			goto give_sigsegv;
	}
	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]))
			goto give_sigsegv;

		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 *) ka->sa.sa_handler;
		struct fdpic_func_descriptor desc;
		if (copy_from_user(&desc, funcptr, sizeof(desc)))
			goto give_sigsegv;
		__frame->pc = desc.text;
		__frame->gr15 = desc.GOT;
	} else {
		__frame->pc   = (unsigned long) 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;

give_sigsegv:
	force_sigsegv(sig, current);
	return -EFAULT;

} /* end setup_frame() */

/*****************************************************************************/
/*
 *
 */
static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
			  sigset_t *set)
{
	struct rt_sigframe __user *frame;
	int rsig;

	set_fs(USER_DS);

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

	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
		goto give_sigsegv;

	rsig = sig;
	if (sig < 32 &&
	    __current_thread_info->exec_domain &&
	    __current_thread_info->exec_domain->signal_invmap)
		rsig = __current_thread_info->exec_domain->signal_invmap[sig];

	if (__put_user(rsig,		&frame->sig) ||
	    __put_user(&frame->info,	&frame->pinfo) ||
	    __put_user(&frame->uc,	&frame->puc))
		goto give_sigsegv;

	if (copy_siginfo_to_user(&frame->info, info))
		goto give_sigsegv;

	/* 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))
		goto give_sigsegv;

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

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

	/* Set up to return from userspace.  If provided, use a stub
	 * already in userspace.  */
	if (ka->sa.sa_flags & SA_RESTORER) {
		if (__put_user(ka->sa.sa_restorer, &frame->pretcode))
			goto give_sigsegv;
	}
	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]))
			goto give_sigsegv;

		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 *) ka->sa.sa_handler;
		struct fdpic_func_descriptor desc;
		if (copy_from_user(&desc, funcptr, sizeof(desc)))
			goto give_sigsegv;
		__frame->pc = desc.text;
		__frame->gr15 = desc.GOT;
	} else {
		__frame->pc   = (unsigned long) 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;

give_sigsegv:
	force_sigsegv(sig, current);
	return -EFAULT;

} /* end setup_rt_frame() */

/*****************************************************************************/
/*
 * OK, we're invoking a handler
 */
static void handle_signal(unsigned long sig, siginfo_t *info,
			 struct k_sigaction *ka)
{
	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 (!(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 (ka->sa.sa_flags & SA_SIGINFO)
		ret = setup_rt_frame(sig, ka, info, oldset);
	else
		ret = setup_frame(sig, ka, oldset);

	if (ret)
		return;

	signal_delivered(sig, info, ka, __frame,
				 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 k_sigaction ka;
	siginfo_t info;
	int signr;

	signr = get_signal_to_deliver(&info, &ka, __frame, NULL);
	if (signr > 0) {
		handle_signal(signr, &info, &ka);
		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 AV	64	/* Always make any pending restarted system calls return -EINTR */
	65	current_thread_info()->restart_block.fn = do_no_restart_syscall;
	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	*/
	161	static inline void __user get_sigframe(struct k_sigaction ka,
1da177e4 LT	162	size_t frame_size)
	163	{
	164	unsigned long sp;
	165
	166	/* Default to using normal stack */
fef2b580	167	sp = __frame->sp;
1da177e4 LT	168
	169	/* This is the X/Open sanctioned signal stack switching. */
	170	if (ka->sa.sa_flags & SA_ONSTACK) {
d09042da	171	if (! sas_ss_flags(sp))
1da177e4 LT	172	sp = current->sas_ss_sp + current->sas_ss_size;
	173	}
	174
	175	return (void __user *) ((sp - frame_size) & ~7UL);
fef2b580	176
1da177e4 LT	177	} /* end get_sigframe() */
	178
	179	/*****************************************************************************/
	180	/*
	181	*
	182	*/
fef2b580	183	static int setup_frame(int sig, struct k_sigaction ka, sigset_t set)
1da177e4 LT	184	{
	185	struct sigframe __user *frame;
	186	int rsig;
	187
5f4ad04a AV	188	set_fs(USER_DS);
5f4ad04a AV	189
fef2b580	190	frame = get_sigframe(ka, sizeof(*frame));
1da177e4 LT	191
	192	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	193	goto give_sigsegv;
	194
	195	rsig = sig;
	196	if (sig < 32 &&
	197	__current_thread_info->exec_domain &&
	198	__current_thread_info->exec_domain->signal_invmap)
	199	rsig = __current_thread_info->exec_domain->signal_invmap[sig];
	200
	201	if (__put_user(rsig, &frame->sig) < 0)
	202	goto give_sigsegv;
	203
	204	if (setup_sigcontext(&frame->sc, set->sig[0]))
	205	goto give_sigsegv;
	206
	207	if (_NSIG_WORDS > 1) {
	208	if (__copy_to_user(frame->extramask, &set->sig[1],
	209	sizeof(frame->extramask)))
	210	goto give_sigsegv;
	211	}
	212
	213	/* Set up to return from userspace. If provided, use a stub
	214	* already in userspace. */
	215	if (ka->sa.sa_flags & SA_RESTORER) {
	216	if (__put_user(ka->sa.sa_restorer, &frame->pretcode) < 0)
	217	goto give_sigsegv;
	218	}
	219	else {
	220	/* Set up the following code on the stack:
	221	* setlos #__NR_sigreturn,gr7
	222	* tira gr0,0
	223	*/
9e4d11f8	224	if (__put_user((__sigrestore_t)frame->retcode, &frame->pretcode) \|\|
1da177e4 LT	225	__put_user(0x8efc0000\|__NR_sigreturn, &frame->retcode[0]) \|\|
	226	__put_user(0xc0700000, &frame->retcode[1]))
	227	goto give_sigsegv;
	228
	229	flush_icache_range((unsigned long) frame->retcode,
	230	(unsigned long) (frame->retcode + 2));
	231	}
	232
5f4ad04a	233	/* Set up registers for the signal handler */
ecd0fa98	234	if (current->personality & FDPIC_FUNCPTRS) {
1da177e4	235	struct fdpic_func_descriptor __user *funcptr =
9e4d11f8	236	(struct fdpic_func_descriptor __user *) ka->sa.sa_handler;
5f4ad04a AV	237	struct fdpic_func_descriptor desc;
	238	if (copy_from_user(&desc, funcptr, sizeof(desc)))
	239	goto give_sigsegv;
	240	__frame->pc = desc.text;
	241	__frame->gr15 = desc.GOT;
1da177e4	242	} else {
fef2b580 DH	243	__frame->pc = (unsigned long) ka->sa.sa_handler;
fef2b580 DH	244	__frame->gr15 = 0;
1da177e4 LT	245	}
1da177e4 LT	246
5f4ad04a AV	247	__frame->sp = (unsigned long) frame;
	248	__frame->lr = (unsigned long) &frame->retcode;
	249	__frame->gr8 = sig;
1da177e4 LT	250
	251	#if DEBUG_SIG
	252	printk("SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
fef2b580	253	sig, current->comm, current->pid, frame, __frame->pc,
8efc0ab5	254	frame->pretcode);
1da177e4 LT	255	#endif
1da177e4 LT	256
a411aee9	257	return 0;
1da177e4 LT	258
1da177e4 LT	259	give_sigsegv:
ad0acab4	260	force_sigsegv(sig, current);
a411aee9	261	return -EFAULT;
8efc0ab5	262
1da177e4 LT	263	} /* end setup_frame() */
	264
	265	/*****************************************************************************/
	266	/*
	267	*
	268	*/
8efc0ab5	269	static int setup_rt_frame(int sig, struct k_sigaction ka, siginfo_t info,
fef2b580	270	sigset_t *set)
1da177e4 LT	271	{
	272	struct rt_sigframe __user *frame;
	273	int rsig;
	274
5f4ad04a AV	275	set_fs(USER_DS);
5f4ad04a AV	276
fef2b580	277	frame = get_sigframe(ka, sizeof(*frame));
1da177e4 LT	278
	279	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	280	goto give_sigsegv;
	281
	282	rsig = sig;
	283	if (sig < 32 &&
	284	__current_thread_info->exec_domain &&
	285	__current_thread_info->exec_domain->signal_invmap)
	286	rsig = __current_thread_info->exec_domain->signal_invmap[sig];
	287
	288	if (__put_user(rsig, &frame->sig) \|\|
	289	__put_user(&frame->info, &frame->pinfo) \|\|
	290	__put_user(&frame->uc, &frame->puc))
	291	goto give_sigsegv;
	292
	293	if (copy_siginfo_to_user(&frame->info, info))
	294	goto give_sigsegv;
	295
	296	/* Create the ucontext. */
	297	if (__put_user(0, &frame->uc.uc_flags) \|\|
9e4d11f8	298	__put_user(NULL, &frame->uc.uc_link) \|\|
fe761416	299	__save_altstack(&frame->uc.uc_stack, __frame->sp))
1da177e4 LT	300	goto give_sigsegv;
	301
	302	if (setup_sigcontext(&frame->uc.uc_mcontext, set->sig[0]))
	303	goto give_sigsegv;
	304
	305	if (__copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)))
	306	goto give_sigsegv;
	307
	308	/* Set up to return from userspace. If provided, use a stub
	309	* already in userspace. */
	310	if (ka->sa.sa_flags & SA_RESTORER) {
	311	if (__put_user(ka->sa.sa_restorer, &frame->pretcode))
	312	goto give_sigsegv;
	313	}
	314	else {
	315	/* Set up the following code on the stack:
	316	* setlos #__NR_sigreturn,gr7
	317	* tira gr0,0
	318	*/
9e4d11f8	319	if (__put_user((__sigrestore_t)frame->retcode, &frame->pretcode) \|\|
1da177e4 LT	320	__put_user(0x8efc0000\|__NR_rt_sigreturn, &frame->retcode[0]) \|\|
	321	__put_user(0xc0700000, &frame->retcode[1]))
	322	goto give_sigsegv;
	323
	324	flush_icache_range((unsigned long) frame->retcode,
	325	(unsigned long) (frame->retcode + 2));
	326	}
	327
	328	/* Set up registers for signal handler */
ecd0fa98	329	if (current->personality & FDPIC_FUNCPTRS) {
9e4d11f8	330	struct fdpic_func_descriptor __user *funcptr =
1da177e4	331	(struct fdpic_func_descriptor __user *) ka->sa.sa_handler;
5f4ad04a AV	332	struct fdpic_func_descriptor desc;
	333	if (copy_from_user(&desc, funcptr, sizeof(desc)))
	334	goto give_sigsegv;
	335	__frame->pc = desc.text;
	336	__frame->gr15 = desc.GOT;
1da177e4	337	} else {
fef2b580 DH	338	__frame->pc = (unsigned long) ka->sa.sa_handler;
fef2b580 DH	339	__frame->gr15 = 0;
1da177e4 LT	340	}
1da177e4 LT	341
5f4ad04a AV	342	__frame->sp = (unsigned long) frame;
	343	__frame->lr = (unsigned long) &frame->retcode;
	344	__frame->gr8 = sig;
	345	__frame->gr9 = (unsigned long) &frame->info;
1da177e4 LT	346
	347	#if DEBUG_SIG
	348	printk("SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
fef2b580	349	sig, current->comm, current->pid, frame, __frame->pc,
8efc0ab5	350	frame->pretcode);
1da177e4 LT	351	#endif
1da177e4 LT	352
a411aee9	353	return 0;
1da177e4 LT	354
1da177e4 LT	355	give_sigsegv:
ad0acab4	356	force_sigsegv(sig, current);
a411aee9	357	return -EFAULT;
1da177e4 LT	358
	359	} /* end setup_rt_frame() */
	360
	361	/*****************************************************************************/
	362	/*
	363	* OK, we're invoking a handler
	364	*/
a610d6e6	365	static void handle_signal(unsigned long sig, siginfo_t *info,
b7f9a11a	366	struct k_sigaction *ka)
1da177e4	367	{
b7f9a11a	368	sigset_t *oldset = sigmask_to_save();
8efc0ab5 DH	369	int ret;
8efc0ab5 DH	370
1da177e4	371	/* Are we from a system call? */
ed1cde68	372	if (__frame->syscallno != -1) {
1da177e4	373	/* If so, check system call restarting.. */
fef2b580	374	switch (__frame->gr8) {
1da177e4 LT	375	case -ERESTART_RESTARTBLOCK:
1da177e4 LT	376	case -ERESTARTNOHAND:
fef2b580	377	__frame->gr8 = -EINTR;
1da177e4 LT	378	break;
	379
	380	case -ERESTARTSYS:
	381	if (!(ka->sa.sa_flags & SA_RESTART)) {
fef2b580	382	__frame->gr8 = -EINTR;
1da177e4 LT	383	break;
1da177e4 LT	384	}
8efc0ab5	385
1da177e4 LT	386	/* fallthrough */
1da177e4 LT	387	case -ERESTARTNOINTR:
fef2b580 DH	388	__frame->gr8 = __frame->orig_gr8;
fef2b580 DH	389	__frame->pc -= 4;
1da177e4	390	}
ed1cde68	391	__frame->syscallno = -1;
1da177e4 LT	392	}
	393
	394	/* Set up the stack frame */
	395	if (ka->sa.sa_flags & SA_SIGINFO)
fef2b580	396	ret = setup_rt_frame(sig, ka, info, oldset);
1da177e4	397	else
fef2b580	398	ret = setup_frame(sig, ka, oldset);
8efc0ab5	399
a610d6e6 AV	400	if (ret)
a610d6e6 AV	401	return;
1da177e4	402
efee984c	403	signal_delivered(sig, info, ka, __frame,
a610d6e6	404	test_thread_flag(TIF_SINGLESTEP));
1da177e4 LT	405	} /* end handle_signal() */
	406
	407	/*****************************************************************************/
	408	/*
	409	* Note that 'init' is a special process: it doesn't get signals it doesn't
	410	* want to handle. Thus you cannot kill init even with a SIGKILL even by
	411	* mistake.
	412	*/
a411aee9	413	static void do_signal(void)
1da177e4 LT	414	{
	415	struct k_sigaction ka;
	416	siginfo_t info;
	417	int signr;
	418
fef2b580	419	signr = get_signal_to_deliver(&info, &ka, __frame, NULL);
a411aee9	420	if (signr > 0) {
a610d6e6	421	handle_signal(signr, &info, &ka);
a411aee9 DH	422	return;
a411aee9 DH	423	}
1da177e4	424
1da177e4	425	/* Did we come from a system call? */
c896a2e0	426	if (__frame->syscallno != -1) {
1da177e4	427	/* Restart the system call - no handlers present */
a411aee9 DH	428	switch (__frame->gr8) {
	429	case -ERESTARTNOHAND:
	430	case -ERESTARTSYS:
	431	case -ERESTARTNOINTR:
fef2b580 DH	432	__frame->gr8 = __frame->orig_gr8;
fef2b580 DH	433	__frame->pc -= 4;
a411aee9	434	break;
1da177e4	435
a411aee9	436	case -ERESTART_RESTARTBLOCK:
44c7afff	437	__frame->gr7 = __NR_restart_syscall;
fef2b580	438	__frame->pc -= 4;
a411aee9	439	break;
1da177e4	440	}
ed1cde68	441	__frame->syscallno = -1;
1da177e4 LT	442	}
1da177e4 LT	443
a411aee9 DH	444	/* if there's no signal to deliver, we just put the saved sigmask
a411aee9 DH	445	* back */
51a7b448	446	restore_saved_sigmask();
1da177e4 LT	447	} /* end do_signal() */
	448
	449	/*****************************************************************************/
	450	/*
	451	* notification of userspace execution resumption
a411aee9	452	* - triggered by the TIF_WORK_MASK flags
1da177e4 LT	453	*/
	454	asmlinkage void do_notify_resume(__u32 thread_info_flags)
	455	{
	456	/* pending single-step? */
	457	if (thread_info_flags & _TIF_SINGLESTEP)
	458	clear_thread_flag(TIF_SINGLESTEP);
	459
	460	/* deal with pending signal delivery */
a3936249	461	if (thread_info_flags & _TIF_SIGPENDING)
a411aee9	462	do_signal();
1da177e4	463
b7bab880 DH	464	/* deal with notification on about to resume userspace execution */
	465	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
	466	clear_thread_flag(TIF_NOTIFY_RESUME);
4a3b9893	467	tracehook_notify_resume(__frame);
b7bab880 DH	468	}
b7bab880 DH	469
1da177e4	470	} /* end do_notify_resume() */