[GitHub/mt8127/android_kernel_alcatel_ttab.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

#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))

/*
 * 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;

	sigdelsetmask(&set, ~_BLOCKABLE);
	spin_lock_irq(&current->sighand->siglock);
	current->blocked = set;
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	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;

	sigdelsetmask(&set, ~_BLOCKABLE);
	spin_lock_irq(&current->sighand->siglock);
	current->blocked = set;
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	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,
			 sigset_t *oldset, struct pt_regs *regs)
{
	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 == 0) {
		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);
	}

	return ret;
}

/*
 * handle a potential signal
 */
static void do_signal(struct pt_regs *regs)
{
	struct k_sigaction ka;
	siginfo_t info;
	sigset_t *oldset;
	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;

	if (test_thread_flag(TIF_RESTORE_SIGMASK))
		oldset = &current->saved_sigmask;
	else
		oldset = &current->blocked;

	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
	if (signr > 0) {
		if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
			/* a signal was successfully delivered; the saved
			 * sigmask will have been stored in the signal frame,
			 * and will be restored by sigreturn, so we can simply
			 * clear the TIF_RESTORE_SIGMASK flag */
			if (test_thread_flag(TIF_RESTORE_SIGMASK))
				clear_thread_flag(TIF_RESTORE_SIGMASK);

			tracehook_signal_handler(signr, &info, &ka, regs,
						 test_thread_flag(TIF_SINGLESTEP));
		}

		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 */
	if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
		clear_thread_flag(TIF_RESTORE_SIGMASK);
		sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
	}
}

/*
 * 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 | _TIF_RESTORE_SIGMASK))
		do_signal(regs);

	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
		clear_thread_flag(TIF_NOTIFY_RESUME);
		tracehook_notify_resume(current_frame());
		if (current->replacement_session_keyring)
			key_replace_session_keyring();
	}
}
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
	34	#define _BLOCKABLE (~(sigmask(SIGKILL) \| sigmask(SIGSTOP)))
	35
	36	/*
	37	* atomically swap in the new signal mask, and wait for a signal.
	38	*/
	39	asmlinkage long sys_sigsuspend(int history0, int history1, old_sigset_t mask)
	40	{
68f3f16d AV	41	sigset_t blocked;
	42	siginitset(&blocked, mask);
	43	return sigsuspend(&blocked);
b920de1b DH	44	}
	45
	46	/*
	47	* set signal action syscall
	48	*/
	49	asmlinkage long sys_sigaction(int sig,
	50	const struct old_sigaction __user *act,
	51	struct old_sigaction __user *oact)
	52	{
	53	struct k_sigaction new_ka, old_ka;
	54	int ret;
	55
	56	if (act) {
	57	old_sigset_t mask;
	58	if (verify_area(VERIFY_READ, act, sizeof(*act)) \|\|
	59	__get_user(new_ka.sa.sa_handler, &act->sa_handler) \|\|
60bdb72e AV	60	__get_user(new_ka.sa.sa_restorer, &act->sa_restorer) \|\|
	61	__get_user(new_ka.sa.sa_flags, &act->sa_flags) \|\|
	62	__get_user(mask, &act->sa_mask))
b920de1b	63	return -EFAULT;
b920de1b DH	64	siginitset(&new_ka.sa.sa_mask, mask);
	65	}
	66
	67	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	68
	69	if (!ret && oact) {
	70	if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) \|\|
	71	__put_user(old_ka.sa.sa_handler, &oact->sa_handler) \|\|
60bdb72e AV	72	__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) \|\|
	73	__put_user(old_ka.sa.sa_flags, &oact->sa_flags) \|\|
	74	__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
b920de1b	75	return -EFAULT;
b920de1b DH	76	}
	77
	78	return ret;
	79	}
	80
	81	/*
	82	* set alternate signal stack syscall
	83	*/
	84	asmlinkage long sys_sigaltstack(const stack_t __user uss, stack_t uoss)
	85	{
7c7fcf76	86	return do_sigaltstack(uss, uoss, current_frame()->sp);
b920de1b DH	87	}
	88
	89	/*
	90	* do a signal return; undo the signal stack.
	91	*/
	92	static int restore_sigcontext(struct pt_regs *regs,
	93	struct sigcontext __user sc, long _d0)
	94	{
	95	unsigned int err = 0;
	96
c05628b4 AV	97	/* Always make any pending restarted system calls return -EINTR */
	98	current_thread_info()->restart_block.fn = do_no_restart_syscall;
	99
b920de1b DH	100	if (is_using_fpu(current))
	101	fpu_kill_state(current);
	102
	103	#define COPY(x) err \|= __get_user(regs->x, &sc->x)
	104	COPY(d1); COPY(d2); COPY(d3);
	105	COPY(a0); COPY(a1); COPY(a2); COPY(a3);
	106	COPY(e0); COPY(e1); COPY(e2); COPY(e3);
	107	COPY(e4); COPY(e5); COPY(e6); COPY(e7);
	108	COPY(lar); COPY(lir);
	109	COPY(mdr); COPY(mdrq);
	110	COPY(mcvf); COPY(mcrl); COPY(mcrh);
	111	COPY(sp); COPY(pc);
	112	#undef COPY
	113
	114	{
	115	unsigned int tmpflags;
	116	#ifndef CONFIG_MN10300_USING_JTAG
	117	#define USER_EPSW (EPSW_FLAG_Z \| EPSW_FLAG_N \| EPSW_FLAG_C \| EPSW_FLAG_V \| \
	118	EPSW_T \| EPSW_nAR)
	119	#else
	120	#define USER_EPSW (EPSW_FLAG_Z \| EPSW_FLAG_N \| EPSW_FLAG_C \| EPSW_FLAG_V \| \
	121	EPSW_nAR)
	122	#endif
	123	err \|= __get_user(tmpflags, &sc->epsw);
	124	regs->epsw = (regs->epsw & ~USER_EPSW) \|
	125	(tmpflags & USER_EPSW);
	126	regs->orig_d0 = -1; /* disable syscall checks */
	127	}
	128
	129	{
	130	struct fpucontext *buf;
	131	err \|= __get_user(buf, &sc->fpucontext);
	132	if (buf) {
	133	if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
	134	goto badframe;
	135	err \|= fpu_restore_sigcontext(buf);
	136	}
	137	}
	138
	139	err \|= __get_user(*_d0, &sc->d0);
	140	return err;
	141
	142	badframe:
	143	return 1;
	144	}
	145
	146	/*
	147	* standard signal return syscall
	148	*/
	149	asmlinkage long sys_sigreturn(void)
	150	{
7c7fcf76	151	struct sigframe __user *frame;
b920de1b DH	152	sigset_t set;
	153	long d0;
	154
7c7fcf76	155	frame = (struct sigframe __user *) current_frame()->sp;
b920de1b DH	156	if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
	157	goto badframe;
	158	if (__get_user(set.sig[0], &frame->sc.oldmask))
	159	goto badframe;
	160
	161	if (_NSIG_WORDS > 1 &&
	162	__copy_from_user(&set.sig[1], &frame->extramask,
	163	sizeof(frame->extramask)))
	164	goto badframe;
	165
	166	sigdelsetmask(&set, ~_BLOCKABLE);
	167	spin_lock_irq(&current->sighand->siglock);
	168	current->blocked = set;
	169	recalc_sigpending();
	170	spin_unlock_irq(&current->sighand->siglock);
	171
7c7fcf76	172	if (restore_sigcontext(current_frame(), &frame->sc, &d0))
b920de1b DH	173	goto badframe;
	174
	175	return d0;
	176
	177	badframe:
	178	force_sig(SIGSEGV, current);
	179	return 0;
	180	}
	181
	182	/*
	183	* realtime signal return syscall
	184	*/
	185	asmlinkage long sys_rt_sigreturn(void)
	186	{
7c7fcf76	187	struct rt_sigframe __user *frame;
b920de1b	188	sigset_t set;
7c7fcf76	189	long d0;
b920de1b	190
7c7fcf76	191	frame = (struct rt_sigframe __user *) current_frame()->sp;
b920de1b DH	192	if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
	193	goto badframe;
	194	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
	195	goto badframe;
	196
	197	sigdelsetmask(&set, ~_BLOCKABLE);
	198	spin_lock_irq(&current->sighand->siglock);
	199	current->blocked = set;
	200	recalc_sigpending();
	201	spin_unlock_irq(&current->sighand->siglock);
	202
7c7fcf76	203	if (restore_sigcontext(current_frame(), &frame->uc.uc_mcontext, &d0))
b920de1b DH	204	goto badframe;
b920de1b DH	205
7c7fcf76 DH	206	if (do_sigaltstack(&frame->uc.uc_stack, NULL, current_frame()->sp) ==
7c7fcf76 DH	207	-EFAULT)
b920de1b DH	208	goto badframe;
	209
	210	return d0;
	211
	212	badframe:
	213	force_sig(SIGSEGV, current);
	214	return 0;
	215	}
	216
	217	/*
	218	* store the userspace context into a signal frame
	219	*/
	220	static int setup_sigcontext(struct sigcontext __user *sc,
	221	struct fpucontext *fpuctx,
	222	struct pt_regs *regs,
	223	unsigned long mask)
	224	{
	225	int tmp, err = 0;
	226
	227	#define COPY(x) err \|= __put_user(regs->x, &sc->x)
	228	COPY(d0); COPY(d1); COPY(d2); COPY(d3);
	229	COPY(a0); COPY(a1); COPY(a2); COPY(a3);
	230	COPY(e0); COPY(e1); COPY(e2); COPY(e3);
	231	COPY(e4); COPY(e5); COPY(e6); COPY(e7);
	232	COPY(lar); COPY(lir);
	233	COPY(mdr); COPY(mdrq);
	234	COPY(mcvf); COPY(mcrl); COPY(mcrh);
	235	COPY(sp); COPY(epsw); COPY(pc);
	236	#undef COPY
	237
	238	tmp = fpu_setup_sigcontext(fpuctx);
	239	if (tmp < 0)
	240	err = 1;
	241	else
	242	err \|= __put_user(tmp ? fpuctx : NULL, &sc->fpucontext);
	243
	244	/* non-iBCS2 extensions.. */
	245	err \|= __put_user(mask, &sc->oldmask);
	246
	247	return err;
	248	}
	249
	250	/*
	251	* determine which stack to use..
	252	*/
	253	static inline void __user get_sigframe(struct k_sigaction ka,
	254	struct pt_regs *regs,
	255	size_t frame_size)
	256	{
	257	unsigned long sp;
	258
	259	/* default to using normal stack */
	260	sp = regs->sp;
	261
	262	/* this is the X/Open sanctioned signal stack switching. */
	263	if (ka->sa.sa_flags & SA_ONSTACK) {
4c03ee73	264	if (sas_ss_flags(sp) == 0)
b920de1b DH	265	sp = current->sas_ss_sp + current->sas_ss_size;
	266	}
	267
	268	return (void __user *) ((sp - frame_size) & ~7UL);
	269	}
	270
	271	/*
	272	* set up a normal signal frame
	273	*/
	274	static int setup_frame(int sig, struct k_sigaction ka, sigset_t set,
	275	struct pt_regs *regs)
	276	{
	277	struct sigframe __user *frame;
	278	int rsig;
	279
	280	frame = get_sigframe(ka, regs, sizeof(*frame));
	281
	282	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	283	goto give_sigsegv;
	284
	285	rsig = sig;
	286	if (sig < 32 &&
	287	current_thread_info()->exec_domain &&
	288	current_thread_info()->exec_domain->signal_invmap)
	289	rsig = current_thread_info()->exec_domain->signal_invmap[sig];
	290
	291	if (__put_user(rsig, &frame->sig) < 0 \|\|
	292	__put_user(&frame->sc, &frame->psc) < 0)
	293	goto give_sigsegv;
	294
	295	if (setup_sigcontext(&frame->sc, &frame->fpuctx, regs, set->sig[0]))
	296	goto give_sigsegv;
	297
	298	if (_NSIG_WORDS > 1) {
	299	if (__copy_to_user(frame->extramask, &set->sig[1],
	300	sizeof(frame->extramask)))
	301	goto give_sigsegv;
	302	}
	303
	304	/* set up to return from userspace. If provided, use a stub already in
	305	* userspace */
	306	if (ka->sa.sa_flags & SA_RESTORER) {
	307	if (__put_user(ka->sa.sa_restorer, &frame->pretcode))
	308	goto give_sigsegv;
	309	} else {
	310	if (__put_user((void (*)(void))frame->retcode,
	311	&frame->pretcode))
	312	goto give_sigsegv;
	313	/* this is mov $,d0; syscall 0 */
	314	if (__put_user(0x2c, (char *)(frame->retcode + 0)) \|\|
	315	__put_user(__NR_sigreturn, (char *)(frame->retcode + 1)) \|\|
	316	__put_user(0x00, (char *)(frame->retcode + 2)) \|\|
	317	__put_user(0xf0, (char *)(frame->retcode + 3)) \|\|
	318	__put_user(0xe0, (char *)(frame->retcode + 4)))
	319	goto give_sigsegv;
	320	flush_icache_range((unsigned long) frame->retcode,
	321	(unsigned long) frame->retcode + 5);
	322	}
	323
	324	/* set up registers for signal handler */
	325	regs->sp = (unsigned long) frame;
	326	regs->pc = (unsigned long) ka->sa.sa_handler;
	327	regs->d0 = sig;
	328	regs->d1 = (unsigned long) &frame->sc;
329
b920de1b DH	330	/* the tracer may want to single-step inside the handler */
	331	if (test_thread_flag(TIF_SINGLESTEP))
	332	ptrace_notify(SIGTRAP);
	333
	334	#if DEBUG_SIG
	335	printk(KERN_DEBUG "SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
	336	sig, current->comm, current->pid, frame, regs->pc,
	337	frame->pretcode);
	338	#endif
	339
	340	return 0;
	341
	342	give_sigsegv:
e46924d2	343	force_sigsegv(sig, current);
b920de1b DH	344	return -EFAULT;
	345	}
	346
	347	/*
	348	* set up a realtime signal frame
	349	*/
	350	static int setup_rt_frame(int sig, struct k_sigaction ka, siginfo_t info,
	351	sigset_t set, struct pt_regs regs)
	352	{
	353	struct rt_sigframe __user *frame;
	354	int rsig;
	355
	356	frame = get_sigframe(ka, regs, sizeof(*frame));
	357
	358	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	359	goto give_sigsegv;
	360
	361	rsig = sig;
	362	if (sig < 32 &&
	363	current_thread_info()->exec_domain &&
	364	current_thread_info()->exec_domain->signal_invmap)
	365	rsig = current_thread_info()->exec_domain->signal_invmap[sig];
	366
	367	if (__put_user(rsig, &frame->sig) \|\|
	368	__put_user(&frame->info, &frame->pinfo) \|\|
	369	__put_user(&frame->uc, &frame->puc) \|\|
	370	copy_siginfo_to_user(&frame->info, info))
	371	goto give_sigsegv;
	372
	373	/* create the ucontext. */
	374	if (__put_user(0, &frame->uc.uc_flags) \|\|
	375	__put_user(0, &frame->uc.uc_link) \|\|
	376	__put_user((void *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp) \|\|
	377	__put_user(sas_ss_flags(regs->sp), &frame->uc.uc_stack.ss_flags) \|\|
	378	__put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size) \|\|
	379	setup_sigcontext(&frame->uc.uc_mcontext,
	380	&frame->fpuctx, regs, set->sig[0]) \|\|
	381	__copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)))
	382	goto give_sigsegv;
	383
	384	/* set up to return from userspace. If provided, use a stub already in
	385	* userspace */
	386	if (ka->sa.sa_flags & SA_RESTORER) {
	387	if (__put_user(ka->sa.sa_restorer, &frame->pretcode))
	388	goto give_sigsegv;
	389	} else {
	390	if (__put_user((void(*)(void))frame->retcode,
	391	&frame->pretcode) \|\|
	392	/* This is mov $,d0; syscall 0 */
	393	__put_user(0x2c, (char *)(frame->retcode + 0)) \|\|
	394	__put_user(__NR_rt_sigreturn,
	395	(char *)(frame->retcode + 1)) \|\|
	396	__put_user(0x00, (char *)(frame->retcode + 2)) \|\|
	397	__put_user(0xf0, (char *)(frame->retcode + 3)) \|\|
	398	__put_user(0xe0, (char *)(frame->retcode + 4)))
	399	goto give_sigsegv;
	400
	401	flush_icache_range((u_long) frame->retcode,
	402	(u_long) frame->retcode + 5);
	403	}
	404
	405	/* Set up registers for signal handler */
	406	regs->sp = (unsigned long) frame;
	407	regs->pc = (unsigned long) ka->sa.sa_handler;
408	regs->d0 = sig;
409	regs->d1 = (long) &frame->info;
410
b920de1b DH	411	/* the tracer may want to single-step inside the handler */
	412	if (test_thread_flag(TIF_SINGLESTEP))
	413	ptrace_notify(SIGTRAP);
	414
	415	#if DEBUG_SIG
	416	printk(KERN_DEBUG "SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
	417	sig, current->comm, current->pid, frame, regs->pc,
	418	frame->pretcode);
	419	#endif
	420
	421	return 0;
	422
	423	give_sigsegv:
e46924d2	424	force_sigsegv(sig, current);
b920de1b DH	425	return -EFAULT;
	426	}
	427
00cbf608 AV	428	static inline void stepback(struct pt_regs *regs)
	429	{
	430	regs->pc -= 2;
	431	regs->orig_d0 = -1;
	432	}
	433
b920de1b DH	434	/*
	435	* handle the actual delivery of a signal to userspace
	436	*/
	437	static int handle_signal(int sig,
	438	siginfo_t info, struct k_sigaction ka,
	439	sigset_t oldset, struct pt_regs regs)
	440	{
	441	int ret;
	442
	443	/* Are we from a system call? */
	444	if (regs->orig_d0 >= 0) {
	445	/* If so, check system call restarting.. */
	446	switch (regs->d0) {
	447	case -ERESTART_RESTARTBLOCK:
	448	case -ERESTARTNOHAND:
	449	regs->d0 = -EINTR;
	450	break;
	451
	452	case -ERESTARTSYS:
	453	if (!(ka->sa.sa_flags & SA_RESTART)) {
	454	regs->d0 = -EINTR;
	455	break;
	456	}
	457
	458	/* fallthrough */
	459	case -ERESTARTNOINTR:
	460	regs->d0 = regs->orig_d0;
00cbf608	461	stepback(regs);
b920de1b DH	462	}
	463	}
	464
	465	/* Set up the stack frame */
	466	if (ka->sa.sa_flags & SA_SIGINFO)
	467	ret = setup_rt_frame(sig, ka, info, oldset, regs);
	468	else
	469	ret = setup_frame(sig, ka, oldset, regs);
	470
	471	if (ret == 0) {
	472	spin_lock_irq(&current->sighand->siglock);
	473	sigorsets(&current->blocked, &current->blocked,
	474	&ka->sa.sa_mask);
	475	if (!(ka->sa.sa_flags & SA_NODEFER))
	476	sigaddset(&current->blocked, sig);
	477	recalc_sigpending();
	478	spin_unlock_irq(&current->sighand->siglock);
	479	}
	480
	481	return ret;
	482	}
	483
	484	/*
	485	* handle a potential signal
	486	*/
	487	static void do_signal(struct pt_regs *regs)
	488	{
	489	struct k_sigaction ka;
	490	siginfo_t info;
	491	sigset_t *oldset;
	492	int signr;
	493
	494	/* we want the common case to go fast, which is why we may in certain
	495	* cases get here from kernel mode */
	496	if (!user_mode(regs))
	497	return;
	498
	499	if (test_thread_flag(TIF_RESTORE_SIGMASK))
	500	oldset = &current->saved_sigmask;
	501	else
	502	oldset = &current->blocked;
	503
	504	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
	505	if (signr > 0) {
	506	if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
	507	/* a signal was successfully delivered; the saved
	508	* sigmask will have been stored in the signal frame,
	509	* and will be restored by sigreturn, so we can simply
	510	* clear the TIF_RESTORE_SIGMASK flag */
	511	if (test_thread_flag(TIF_RESTORE_SIGMASK))
	512	clear_thread_flag(TIF_RESTORE_SIGMASK);
5d289964 DH	513
	514	tracehook_signal_handler(signr, &info, &ka, regs,
	515	test_thread_flag(TIF_SINGLESTEP));
b920de1b DH	516	}
	517
	518	return;
	519	}
	520
	521	/* did we come from a system call? */
	522	if (regs->orig_d0 >= 0) {
	523	/* restart the system call - no handlers present */
	524	switch (regs->d0) {
	525	case -ERESTARTNOHAND:
	526	case -ERESTARTSYS:
	527	case -ERESTARTNOINTR:
	528	regs->d0 = regs->orig_d0;
00cbf608	529	stepback(regs);
b920de1b DH	530	break;
	531
	532	case -ERESTART_RESTARTBLOCK:
	533	regs->d0 = __NR_restart_syscall;
00cbf608	534	stepback(regs);
b920de1b DH	535	break;
	536	}
	537	}
	538
	539	/* if there's no signal to deliver, we just put the saved sigmask
	540	* back */
	541	if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
	542	clear_thread_flag(TIF_RESTORE_SIGMASK);
	543	sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
	544	}
	545	}
	546
	547	/*
	548	* notification of userspace execution resumption
	549	* - triggered by current->work.notify_resume
	550	*/
	551	asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags)
	552	{
	553	/* Pending single-step? */
	554	if (thread_info_flags & _TIF_SINGLESTEP) {
	555	#ifndef CONFIG_MN10300_USING_JTAG
	556	regs->epsw \|= EPSW_T;
	557	clear_thread_flag(TIF_SINGLESTEP);
	558	#else
	559	BUG(); /* no h/w single-step if using JTAG unit */
	560	#endif
	561	}
	562
	563	/* deal with pending signal delivery */
	564	if (thread_info_flags & (_TIF_SIGPENDING \| _TIF_RESTORE_SIGMASK))
	565	do_signal(regs);
5d289964 DH	566
	567	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
	568	clear_thread_flag(TIF_NOTIFY_RESUME);
7c7fcf76	569	tracehook_notify_resume(current_frame());
ee18d64c DH	570	if (current->replacement_session_keyring)
ee18d64c DH	571	key_replace_session_keyring();
5d289964	572	}
b920de1b	573	}