[deliverable/linux.git] / arch / mn10300 / kernel / signal.c

/* MN10300 Signal handling
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, 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/stddef.h>
#include <linux/tty.h>
#include <linux/personality.h>
#include <linux/suspend.h>
#include <linux/tracehook.h>
#include <asm/cacheflush.h>
#include <asm/ucontext.h>
#include <asm/uaccess.h>
#include <asm/fpu.h>
#include "sigframe.h"

#define DEBUG_SIG 0

/*
 * atomically swap in the new signal mask, and wait for a signal.
 */
asmlinkage long sys_sigsuspend(int history0, int history1, old_sigset_t mask)
{
	sigset_t blocked;
	siginitset(&blocked, mask);
	return sigsuspend(&blocked);
}

/*
 * set signal action syscall
 */
asmlinkage long sys_sigaction(int sig,
			      const struct old_sigaction __user *act,
			      struct old_sigaction __user *oact)
{
	struct k_sigaction new_ka, old_ka;
	int ret;

	if (act) {
		old_sigset_t mask;
		if (verify_area(VERIFY_READ, act, sizeof(*act)) ||
		    __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
		    __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
		    __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
		    __get_user(mask, &act->sa_mask))
			return -EFAULT;
		siginitset(&new_ka.sa.sa_mask, mask);
	}

	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

	if (!ret && oact) {
		if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) ||
		    __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
		    __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
		    __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
		    __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
			return -EFAULT;
	}

	return ret;
}

/*
 * set alternate signal stack syscall
 */
asmlinkage long sys_sigaltstack(const stack_t __user *uss, stack_t *uoss)
{
	return do_sigaltstack(uss, uoss, current_frame()->sp);
}

/*
 * do a signal return; undo the signal stack.
 */
static int restore_sigcontext(struct pt_regs *regs,
			      struct sigcontext __user *sc, long *_d0)
{
	unsigned int err = 0;

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

	if (is_using_fpu(current))
		fpu_kill_state(current);

#define COPY(x) err |= __get_user(regs->x, &sc->x)
	COPY(d1); COPY(d2); COPY(d3);
	COPY(a0); COPY(a1); COPY(a2); COPY(a3);
	COPY(e0); COPY(e1); COPY(e2); COPY(e3);
	COPY(e4); COPY(e5); COPY(e6); COPY(e7);
	COPY(lar); COPY(lir);
	COPY(mdr); COPY(mdrq);
	COPY(mcvf); COPY(mcrl); COPY(mcrh);
	COPY(sp); COPY(pc);
#undef COPY

	{
		unsigned int tmpflags;
#ifndef CONFIG_MN10300_USING_JTAG
#define USER_EPSW (EPSW_FLAG_Z | EPSW_FLAG_N | EPSW_FLAG_C | EPSW_FLAG_V | \
		   EPSW_T | EPSW_nAR)
#else
#define USER_EPSW (EPSW_FLAG_Z | EPSW_FLAG_N | EPSW_FLAG_C | EPSW_FLAG_V | \
		   EPSW_nAR)
#endif
		err |= __get_user(tmpflags, &sc->epsw);
		regs->epsw = (regs->epsw & ~USER_EPSW) |
		  (tmpflags & USER_EPSW);
		regs->orig_d0 = -1;		/* disable syscall checks */
	}

	{
		struct fpucontext *buf;
		err |= __get_user(buf, &sc->fpucontext);
		if (buf) {
			if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
				goto badframe;
			err |= fpu_restore_sigcontext(buf);
		}
	}

	err |= __get_user(*_d0, &sc->d0);
	return err;

badframe:
	return 1;
}

/*
 * standard signal return syscall
 */
asmlinkage long sys_sigreturn(void)
{
	struct sigframe __user *frame;
	sigset_t set;
	long d0;

	frame = (struct sigframe __user *) current_frame()->sp;
	if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
		goto badframe;
	if (__get_user(set.sig[0], &frame->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(current_frame(), &frame->sc, &d0))
		goto badframe;

	return d0;

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

/*
 * realtime signal return syscall
 */
asmlinkage long sys_rt_sigreturn(void)
{
	struct rt_sigframe __user *frame;
	sigset_t set;
	long d0;

	frame = (struct rt_sigframe __user *) current_frame()->sp;
	if (verify_area(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(current_frame(), &frame->uc.uc_mcontext, &d0))
		goto badframe;

	if (do_sigaltstack(&frame->uc.uc_stack, NULL, current_frame()->sp) ==
	    -EFAULT)
		goto badframe;

	return d0;

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

/*
 * store the userspace context into a signal frame
 */
static int setup_sigcontext(struct sigcontext __user *sc,
			    struct fpucontext *fpuctx,
			    struct pt_regs *regs,
			    unsigned long mask)
{
	int tmp, err = 0;

#define COPY(x) err |= __put_user(regs->x, &sc->x)
	COPY(d0); COPY(d1); COPY(d2); COPY(d3);
	COPY(a0); COPY(a1); COPY(a2); COPY(a3);
	COPY(e0); COPY(e1); COPY(e2); COPY(e3);
	COPY(e4); COPY(e5); COPY(e6); COPY(e7);
	COPY(lar); COPY(lir);
	COPY(mdr); COPY(mdrq);
	COPY(mcvf); COPY(mcrl); COPY(mcrh);
	COPY(sp); COPY(epsw); COPY(pc);
#undef COPY

	tmp = fpu_setup_sigcontext(fpuctx);
	if (tmp < 0)
		err = 1;
	else
		err |= __put_user(tmp ? fpuctx : NULL, &sc->fpucontext);

	/* non-iBCS2 extensions.. */
	err |= __put_user(mask, &sc->oldmask);

	return err;
}

/*
 * determine which stack to use..
 */
static inline 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->sp;

	/* 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) & ~7UL);
}

/*
 * set up a normal signal frame
 */
static int setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
		       struct pt_regs *regs)
{
	struct sigframe __user *frame;
	int rsig;

	frame = get_sigframe(ka, regs, 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 ||
	    __put_user(&frame->sc, &frame->psc) < 0)
		goto give_sigsegv;

	if (setup_sigcontext(&frame->sc, &frame->fpuctx, regs, 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))
			goto give_sigsegv;
	} else {
		if (__put_user((void (*)(void))frame->retcode,
			       &frame->pretcode))
			goto give_sigsegv;
		/* this is mov $,d0; syscall 0 */
		if (__put_user(0x2c, (char *)(frame->retcode + 0)) ||
		    __put_user(__NR_sigreturn, (char *)(frame->retcode + 1)) ||
		    __put_user(0x00, (char *)(frame->retcode + 2)) ||
		    __put_user(0xf0, (char *)(frame->retcode + 3)) ||
		    __put_user(0xe0, (char *)(frame->retcode + 4)))
			goto give_sigsegv;
		flush_icache_range((unsigned long) frame->retcode,
				   (unsigned long) frame->retcode + 5);
	}

	/* set up registers for signal handler */
	regs->sp = (unsigned long) frame;
	regs->pc = (unsigned long) ka->sa.sa_handler;
	regs->d0 = sig;
	regs->d1 = (unsigned long) &frame->sc;

	/* the tracer may want to single-step inside the handler */
	if (test_thread_flag(TIF_SINGLESTEP))
		ptrace_notify(SIGTRAP);

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

	return 0;

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

/*
 * set up a realtime signal frame
 */
static int 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 rsig;

	frame = get_sigframe(ka, regs, 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) ||
	    copy_siginfo_to_user(&frame->info, info))
		goto give_sigsegv;

	/* create the ucontext.  */
	if (__put_user(0, &frame->uc.uc_flags) ||
	    __put_user(0, &frame->uc.uc_link) ||
	    __put_user((void *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp) ||
	    __put_user(sas_ss_flags(regs->sp), &frame->uc.uc_stack.ss_flags) ||
	    __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size) ||
	    setup_sigcontext(&frame->uc.uc_mcontext,
			     &frame->fpuctx, regs, set->sig[0]) ||
	    __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 {
		if (__put_user((void(*)(void))frame->retcode,
			       &frame->pretcode) ||
		    /* This is mov $,d0; syscall 0 */
		    __put_user(0x2c, (char *)(frame->retcode + 0)) ||
		    __put_user(__NR_rt_sigreturn,
			       (char *)(frame->retcode + 1)) ||
		    __put_user(0x00, (char *)(frame->retcode + 2)) ||
		    __put_user(0xf0, (char *)(frame->retcode + 3)) ||
		    __put_user(0xe0, (char *)(frame->retcode + 4)))
			goto give_sigsegv;

		flush_icache_range((u_long) frame->retcode,
				   (u_long) frame->retcode + 5);
	}

	/* Set up registers for signal handler */
	regs->sp = (unsigned long) frame;
	regs->pc = (unsigned long) ka->sa.sa_handler;
	regs->d0 = sig;
	regs->d1 = (long) &frame->info;

	/* the tracer may want to single-step inside the handler */
	if (test_thread_flag(TIF_SINGLESTEP))
		ptrace_notify(SIGTRAP);

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

	return 0;

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

static inline void stepback(struct pt_regs *regs)
{
	regs->pc -= 2;
	regs->orig_d0 = -1;
}

/*
 * handle the actual delivery of a signal to userspace
 */
static int handle_signal(int sig,
			 siginfo_t *info, struct k_sigaction *ka,
			 struct pt_regs *regs)
{
	sigset_t *oldset = sigmask_to_save();
	int ret;

	/* Are we from a system call? */
	if (regs->orig_d0 >= 0) {
		/* If so, check system call restarting.. */
		switch (regs->d0) {
		case -ERESTART_RESTARTBLOCK:
		case -ERESTARTNOHAND:
			regs->d0 = -EINTR;
			break;

		case -ERESTARTSYS:
			if (!(ka->sa.sa_flags & SA_RESTART)) {
				regs->d0 = -EINTR;
				break;
			}

			/* fallthrough */
		case -ERESTARTNOINTR:
			regs->d0 = regs->orig_d0;
			stepback(regs);
		}
	}

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

	signal_delivered(sig, info, ka, regs,
			 test_thread_flag(TIF_SINGLESTEP));
	return 0;
}

/*
 * handle a potential signal
 */
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 */
	if (!user_mode(regs))
		return;

	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
	if (signr > 0) {
		if (handle_signal(signr, &info, &ka, regs) == 0) {
		}

		return;
	}

	/* did we come from a system call? */
	if (regs->orig_d0 >= 0) {
		/* restart the system call - no handlers present */
		switch (regs->d0) {
		case -ERESTARTNOHAND:
		case -ERESTARTSYS:
		case -ERESTARTNOINTR:
			regs->d0 = regs->orig_d0;
			stepback(regs);
			break;

		case -ERESTART_RESTARTBLOCK:
			regs->d0 = __NR_restart_syscall;
			stepback(regs);
			break;
		}
	}

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

/*
 * notification of userspace execution resumption
 * - triggered by current->work.notify_resume
 */
asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags)
{
	/* Pending single-step? */
	if (thread_info_flags & _TIF_SINGLESTEP) {
#ifndef CONFIG_MN10300_USING_JTAG
		regs->epsw |= EPSW_T;
		clear_thread_flag(TIF_SINGLESTEP);
#else
		BUG(); /* no h/w single-step if using JTAG unit */
#endif
	}

	/* 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(current_frame());
	}
}
Commit	Line	Data
b920de1b DH	1	/* MN10300 Signal handling
	2	*
	3	* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
	4	* Written by David Howells (dhowells@redhat.com)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public Licence
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the Licence, or (at your option) any later version.
	10	*/
	11
	12	#include <linux/sched.h>
	13	#include <linux/mm.h>
	14	#include <linux/smp.h>
b920de1b DH	15	#include <linux/kernel.h>
	16	#include <linux/signal.h>
	17	#include <linux/errno.h>
	18	#include <linux/wait.h>
	19	#include <linux/ptrace.h>
	20	#include <linux/unistd.h>
	21	#include <linux/stddef.h>
	22	#include <linux/tty.h>
	23	#include <linux/personality.h>
	24	#include <linux/suspend.h>
5d289964	25	#include <linux/tracehook.h>
b920de1b DH	26	#include <asm/cacheflush.h>
	27	#include <asm/ucontext.h>
	28	#include <asm/uaccess.h>
	29	#include <asm/fpu.h>
	30	#include "sigframe.h"
	31
	32	#define DEBUG_SIG 0
	33
b920de1b DH	34	/*
	35	* atomically swap in the new signal mask, and wait for a signal.
	36	*/
	37	asmlinkage long sys_sigsuspend(int history0, int history1, old_sigset_t mask)
	38	{
68f3f16d AV	39	sigset_t blocked;
	40	siginitset(&blocked, mask);
	41	return sigsuspend(&blocked);
b920de1b DH	42	}
	43
	44	/*
	45	* set signal action syscall
	46	*/
	47	asmlinkage long sys_sigaction(int sig,
	48	const struct old_sigaction __user *act,
	49	struct old_sigaction __user *oact)
	50	{
	51	struct k_sigaction new_ka, old_ka;
	52	int ret;
	53
	54	if (act) {
	55	old_sigset_t mask;
	56	if (verify_area(VERIFY_READ, act, sizeof(*act)) \|\|
	57	__get_user(new_ka.sa.sa_handler, &act->sa_handler) \|\|
60bdb72e AV	58	__get_user(new_ka.sa.sa_restorer, &act->sa_restorer) \|\|
	59	__get_user(new_ka.sa.sa_flags, &act->sa_flags) \|\|
	60	__get_user(mask, &act->sa_mask))
b920de1b	61	return -EFAULT;
b920de1b DH	62	siginitset(&new_ka.sa.sa_mask, mask);
	63	}
	64
	65	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	66
	67	if (!ret && oact) {
	68	if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) \|\|
	69	__put_user(old_ka.sa.sa_handler, &oact->sa_handler) \|\|
60bdb72e AV	70	__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) \|\|
	71	__put_user(old_ka.sa.sa_flags, &oact->sa_flags) \|\|
	72	__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
b920de1b	73	return -EFAULT;
b920de1b DH	74	}
	75
	76	return ret;
	77	}
	78
	79	/*
	80	* set alternate signal stack syscall
	81	*/
	82	asmlinkage long sys_sigaltstack(const stack_t __user uss, stack_t uoss)
	83	{
7c7fcf76	84	return do_sigaltstack(uss, uoss, current_frame()->sp);
b920de1b DH	85	}
	86
	87	/*
	88	* do a signal return; undo the signal stack.
	89	*/
	90	static int restore_sigcontext(struct pt_regs *regs,
	91	struct sigcontext __user sc, long _d0)
	92	{
	93	unsigned int err = 0;
	94
c05628b4 AV	95	/* Always make any pending restarted system calls return -EINTR */
	96	current_thread_info()->restart_block.fn = do_no_restart_syscall;
	97
b920de1b DH	98	if (is_using_fpu(current))
	99	fpu_kill_state(current);
	100
	101	#define COPY(x) err \|= __get_user(regs->x, &sc->x)
	102	COPY(d1); COPY(d2); COPY(d3);
	103	COPY(a0); COPY(a1); COPY(a2); COPY(a3);
	104	COPY(e0); COPY(e1); COPY(e2); COPY(e3);
	105	COPY(e4); COPY(e5); COPY(e6); COPY(e7);
	106	COPY(lar); COPY(lir);
	107	COPY(mdr); COPY(mdrq);
	108	COPY(mcvf); COPY(mcrl); COPY(mcrh);
	109	COPY(sp); COPY(pc);
	110	#undef COPY
	111
	112	{
	113	unsigned int tmpflags;
	114	#ifndef CONFIG_MN10300_USING_JTAG
	115	#define USER_EPSW (EPSW_FLAG_Z \| EPSW_FLAG_N \| EPSW_FLAG_C \| EPSW_FLAG_V \| \
	116	EPSW_T \| EPSW_nAR)
	117	#else
	118	#define USER_EPSW (EPSW_FLAG_Z \| EPSW_FLAG_N \| EPSW_FLAG_C \| EPSW_FLAG_V \| \
	119	EPSW_nAR)
	120	#endif
	121	err \|= __get_user(tmpflags, &sc->epsw);
	122	regs->epsw = (regs->epsw & ~USER_EPSW) \|
	123	(tmpflags & USER_EPSW);
	124	regs->orig_d0 = -1; /* disable syscall checks */
	125	}
	126
	127	{
	128	struct fpucontext *buf;
	129	err \|= __get_user(buf, &sc->fpucontext);
	130	if (buf) {
	131	if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
	132	goto badframe;
	133	err \|= fpu_restore_sigcontext(buf);
	134	}
	135	}
	136
	137	err \|= __get_user(*_d0, &sc->d0);
	138	return err;
	139
	140	badframe:
	141	return 1;
	142	}
	143
	144	/*
	145	* standard signal return syscall
	146	*/
	147	asmlinkage long sys_sigreturn(void)
	148	{
7c7fcf76	149	struct sigframe __user *frame;
b920de1b DH	150	sigset_t set;
	151	long d0;
	152
7c7fcf76	153	frame = (struct sigframe __user *) current_frame()->sp;
b920de1b DH	154	if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
	155	goto badframe;
	156	if (__get_user(set.sig[0], &frame->sc.oldmask))
	157	goto badframe;
	158
	159	if (_NSIG_WORDS > 1 &&
	160	__copy_from_user(&set.sig[1], &frame->extramask,
	161	sizeof(frame->extramask)))
	162	goto badframe;
	163
00f35785	164	set_current_blocked(&set);
b920de1b	165
7c7fcf76	166	if (restore_sigcontext(current_frame(), &frame->sc, &d0))
b920de1b DH	167	goto badframe;
	168
	169	return d0;
	170
	171	badframe:
	172	force_sig(SIGSEGV, current);
	173	return 0;
	174	}
	175
	176	/*
	177	* realtime signal return syscall
	178	*/
	179	asmlinkage long sys_rt_sigreturn(void)
	180	{
7c7fcf76	181	struct rt_sigframe __user *frame;
b920de1b	182	sigset_t set;
7c7fcf76	183	long d0;
b920de1b	184
7c7fcf76	185	frame = (struct rt_sigframe __user *) current_frame()->sp;
b920de1b DH	186	if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
	187	goto badframe;
	188	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
	189	goto badframe;
	190
00f35785	191	set_current_blocked(&set);
b920de1b	192
7c7fcf76	193	if (restore_sigcontext(current_frame(), &frame->uc.uc_mcontext, &d0))
b920de1b DH	194	goto badframe;
b920de1b DH	195
7c7fcf76 DH	196	if (do_sigaltstack(&frame->uc.uc_stack, NULL, current_frame()->sp) ==
7c7fcf76 DH	197	-EFAULT)
b920de1b DH	198	goto badframe;
	199
	200	return d0;
	201
	202	badframe:
	203	force_sig(SIGSEGV, current);
	204	return 0;
	205	}
	206
	207	/*
	208	* store the userspace context into a signal frame
	209	*/
	210	static int setup_sigcontext(struct sigcontext __user *sc,
	211	struct fpucontext *fpuctx,
	212	struct pt_regs *regs,
	213	unsigned long mask)
	214	{
	215	int tmp, err = 0;
	216
	217	#define COPY(x) err \|= __put_user(regs->x, &sc->x)
	218	COPY(d0); COPY(d1); COPY(d2); COPY(d3);
	219	COPY(a0); COPY(a1); COPY(a2); COPY(a3);
	220	COPY(e0); COPY(e1); COPY(e2); COPY(e3);
	221	COPY(e4); COPY(e5); COPY(e6); COPY(e7);
	222	COPY(lar); COPY(lir);
	223	COPY(mdr); COPY(mdrq);
	224	COPY(mcvf); COPY(mcrl); COPY(mcrh);
	225	COPY(sp); COPY(epsw); COPY(pc);
	226	#undef COPY
	227
	228	tmp = fpu_setup_sigcontext(fpuctx);
	229	if (tmp < 0)
	230	err = 1;
	231	else
	232	err \|= __put_user(tmp ? fpuctx : NULL, &sc->fpucontext);
	233
	234	/* non-iBCS2 extensions.. */
	235	err \|= __put_user(mask, &sc->oldmask);
	236
	237	return err;
	238	}
	239
	240	/*
	241	* determine which stack to use..
	242	*/
	243	static inline void __user get_sigframe(struct k_sigaction ka,
	244	struct pt_regs *regs,
	245	size_t frame_size)
	246	{
	247	unsigned long sp;
	248
	249	/* default to using normal stack */
	250	sp = regs->sp;
	251
	252	/* this is the X/Open sanctioned signal stack switching. */
	253	if (ka->sa.sa_flags & SA_ONSTACK) {
4c03ee73	254	if (sas_ss_flags(sp) == 0)
b920de1b DH	255	sp = current->sas_ss_sp + current->sas_ss_size;
	256	}
	257
	258	return (void __user *) ((sp - frame_size) & ~7UL);
	259	}
	260
	261	/*
	262	* set up a normal signal frame
	263	*/
	264	static int setup_frame(int sig, struct k_sigaction ka, sigset_t set,
	265	struct pt_regs *regs)
	266	{
	267	struct sigframe __user *frame;
	268	int rsig;
	269
	270	frame = get_sigframe(ka, regs, sizeof(*frame));
	271
	272	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	273	goto give_sigsegv;
	274
	275	rsig = sig;
	276	if (sig < 32 &&
	277	current_thread_info()->exec_domain &&
	278	current_thread_info()->exec_domain->signal_invmap)
	279	rsig = current_thread_info()->exec_domain->signal_invmap[sig];
	280
	281	if (__put_user(rsig, &frame->sig) < 0 \|\|
	282	__put_user(&frame->sc, &frame->psc) < 0)
	283	goto give_sigsegv;
	284
	285	if (setup_sigcontext(&frame->sc, &frame->fpuctx, regs, set->sig[0]))
	286	goto give_sigsegv;
	287
	288	if (_NSIG_WORDS > 1) {
	289	if (__copy_to_user(frame->extramask, &set->sig[1],
	290	sizeof(frame->extramask)))
	291	goto give_sigsegv;
	292	}
	293
	294	/* set up to return from userspace. If provided, use a stub already in
	295	* userspace */
	296	if (ka->sa.sa_flags & SA_RESTORER) {
	297	if (__put_user(ka->sa.sa_restorer, &frame->pretcode))
	298	goto give_sigsegv;
	299	} else {
	300	if (__put_user((void (*)(void))frame->retcode,
	301	&frame->pretcode))
	302	goto give_sigsegv;
	303	/* this is mov $,d0; syscall 0 */
	304	if (__put_user(0x2c, (char *)(frame->retcode + 0)) \|\|
	305	__put_user(__NR_sigreturn, (char *)(frame->retcode + 1)) \|\|
	306	__put_user(0x00, (char *)(frame->retcode + 2)) \|\|
	307	__put_user(0xf0, (char *)(frame->retcode + 3)) \|\|
	308	__put_user(0xe0, (char *)(frame->retcode + 4)))
	309	goto give_sigsegv;
	310	flush_icache_range((unsigned long) frame->retcode,
	311	(unsigned long) frame->retcode + 5);
	312	}
	313
	314	/* set up registers for signal handler */
	315	regs->sp = (unsigned long) frame;
	316	regs->pc = (unsigned long) ka->sa.sa_handler;
	317	regs->d0 = sig;
	318	regs->d1 = (unsigned long) &frame->sc;
319
b920de1b DH	320	/* the tracer may want to single-step inside the handler */
	321	if (test_thread_flag(TIF_SINGLESTEP))
	322	ptrace_notify(SIGTRAP);
	323
	324	#if DEBUG_SIG
	325	printk(KERN_DEBUG "SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
	326	sig, current->comm, current->pid, frame, regs->pc,
	327	frame->pretcode);
	328	#endif
	329
	330	return 0;
	331
	332	give_sigsegv:
e46924d2	333	force_sigsegv(sig, current);
b920de1b DH	334	return -EFAULT;
	335	}
	336
	337	/*
	338	* set up a realtime signal frame
	339	*/
	340	static int setup_rt_frame(int sig, struct k_sigaction ka, siginfo_t info,
	341	sigset_t set, struct pt_regs regs)
	342	{
	343	struct rt_sigframe __user *frame;
	344	int rsig;
	345
	346	frame = get_sigframe(ka, regs, sizeof(*frame));
	347
	348	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	349	goto give_sigsegv;
	350
	351	rsig = sig;
	352	if (sig < 32 &&
	353	current_thread_info()->exec_domain &&
	354	current_thread_info()->exec_domain->signal_invmap)
	355	rsig = current_thread_info()->exec_domain->signal_invmap[sig];
	356
	357	if (__put_user(rsig, &frame->sig) \|\|
	358	__put_user(&frame->info, &frame->pinfo) \|\|
	359	__put_user(&frame->uc, &frame->puc) \|\|
	360	copy_siginfo_to_user(&frame->info, info))
	361	goto give_sigsegv;
	362
	363	/* create the ucontext. */
	364	if (__put_user(0, &frame->uc.uc_flags) \|\|
	365	__put_user(0, &frame->uc.uc_link) \|\|
	366	__put_user((void *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp) \|\|
	367	__put_user(sas_ss_flags(regs->sp), &frame->uc.uc_stack.ss_flags) \|\|
	368	__put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size) \|\|
	369	setup_sigcontext(&frame->uc.uc_mcontext,
	370	&frame->fpuctx, regs, set->sig[0]) \|\|
	371	__copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)))
	372	goto give_sigsegv;
	373
	374	/* set up to return from userspace. If provided, use a stub already in
	375	* userspace */
	376	if (ka->sa.sa_flags & SA_RESTORER) {
	377	if (__put_user(ka->sa.sa_restorer, &frame->pretcode))
	378	goto give_sigsegv;
	379	} else {
	380	if (__put_user((void(*)(void))frame->retcode,
	381	&frame->pretcode) \|\|
	382	/* This is mov $,d0; syscall 0 */
	383	__put_user(0x2c, (char *)(frame->retcode + 0)) \|\|
	384	__put_user(__NR_rt_sigreturn,
	385	(char *)(frame->retcode + 1)) \|\|
	386	__put_user(0x00, (char *)(frame->retcode + 2)) \|\|
	387	__put_user(0xf0, (char *)(frame->retcode + 3)) \|\|
	388	__put_user(0xe0, (char *)(frame->retcode + 4)))
	389	goto give_sigsegv;
	390
	391	flush_icache_range((u_long) frame->retcode,
	392	(u_long) frame->retcode + 5);
	393	}
	394
	395	/* Set up registers for signal handler */
	396	regs->sp = (unsigned long) frame;
	397	regs->pc = (unsigned long) ka->sa.sa_handler;
398	regs->d0 = sig;
399	regs->d1 = (long) &frame->info;
400
b920de1b DH	401	/* the tracer may want to single-step inside the handler */
	402	if (test_thread_flag(TIF_SINGLESTEP))
	403	ptrace_notify(SIGTRAP);
	404
	405	#if DEBUG_SIG
	406	printk(KERN_DEBUG "SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
	407	sig, current->comm, current->pid, frame, regs->pc,
	408	frame->pretcode);
	409	#endif
	410
	411	return 0;
	412
	413	give_sigsegv:
e46924d2	414	force_sigsegv(sig, current);
b920de1b DH	415	return -EFAULT;
	416	}
	417
00cbf608 AV	418	static inline void stepback(struct pt_regs *regs)
	419	{
	420	regs->pc -= 2;
	421	regs->orig_d0 = -1;
	422	}
	423
b920de1b DH	424	/*
	425	* handle the actual delivery of a signal to userspace
	426	*/
	427	static int handle_signal(int sig,
	428	siginfo_t info, struct k_sigaction ka,
b7f9a11a	429	struct pt_regs *regs)
b920de1b	430	{
b7f9a11a	431	sigset_t *oldset = sigmask_to_save();
b920de1b DH	432	int ret;
	433
	434	/* Are we from a system call? */
	435	if (regs->orig_d0 >= 0) {
	436	/* If so, check system call restarting.. */
	437	switch (regs->d0) {
	438	case -ERESTART_RESTARTBLOCK:
	439	case -ERESTARTNOHAND:
	440	regs->d0 = -EINTR;
	441	break;
	442
	443	case -ERESTARTSYS:
	444	if (!(ka->sa.sa_flags & SA_RESTART)) {
	445	regs->d0 = -EINTR;
	446	break;
	447	}
	448
	449	/* fallthrough */
	450	case -ERESTARTNOINTR:
	451	regs->d0 = regs->orig_d0;
00cbf608	452	stepback(regs);
b920de1b DH	453	}
	454	}
	455
	456	/* Set up the stack frame */
	457	if (ka->sa.sa_flags & SA_SIGINFO)
	458	ret = setup_rt_frame(sig, ka, info, oldset, regs);
	459	else
	460	ret = setup_frame(sig, ka, oldset, regs);
a610d6e6	461	if (ret)
b45f9330	462	return ret;
b920de1b	463
efee984c	464	signal_delivered(sig, info, ka, regs,
b45f9330 GU	465	test_thread_flag(TIF_SINGLESTEP));
b45f9330 GU	466	return 0;
b920de1b DH	467	}
	468
	469	/*
	470	* handle a potential signal
	471	*/
	472	static void do_signal(struct pt_regs *regs)
	473	{
	474	struct k_sigaction ka;
	475	siginfo_t info;
b920de1b DH	476	int signr;
	477
	478	/* we want the common case to go fast, which is why we may in certain
	479	* cases get here from kernel mode */
	480	if (!user_mode(regs))
	481	return;
	482
b920de1b DH	483	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
b920de1b DH	484	if (signr > 0) {
b7f9a11a	485	if (handle_signal(signr, &info, &ka, regs) == 0) {
b920de1b DH	486	}
	487
	488	return;
	489	}
	490
	491	/* did we come from a system call? */
	492	if (regs->orig_d0 >= 0) {
	493	/* restart the system call - no handlers present */
	494	switch (regs->d0) {
	495	case -ERESTARTNOHAND:
	496	case -ERESTARTSYS:
	497	case -ERESTARTNOINTR:
	498	regs->d0 = regs->orig_d0;
00cbf608	499	stepback(regs);
b920de1b DH	500	break;
	501
	502	case -ERESTART_RESTARTBLOCK:
	503	regs->d0 = __NR_restart_syscall;
00cbf608	504	stepback(regs);
b920de1b DH	505	break;
	506	}
	507	}
	508
	509	/* if there's no signal to deliver, we just put the saved sigmask
	510	* back */
51a7b448	511	restore_saved_sigmask();
b920de1b DH	512	}
	513
	514	/*
	515	* notification of userspace execution resumption
	516	* - triggered by current->work.notify_resume
	517	*/
	518	asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags)
	519	{
	520	/* Pending single-step? */
	521	if (thread_info_flags & _TIF_SINGLESTEP) {
	522	#ifndef CONFIG_MN10300_USING_JTAG
	523	regs->epsw \|= EPSW_T;
	524	clear_thread_flag(TIF_SINGLESTEP);
	525	#else
	526	BUG(); /* no h/w single-step if using JTAG unit */
	527	#endif
	528	}
	529
	530	/* deal with pending signal delivery */
6fd84c08	531	if (thread_info_flags & _TIF_SIGPENDING)
b920de1b	532	do_signal(regs);
5d289964 DH	533
	534	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
	535	clear_thread_flag(TIF_NOTIFY_RESUME);
7c7fcf76	536	tracehook_notify_resume(current_frame());
5d289964	537	}
b920de1b	538	}