[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);
	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;

	sigdelsetmask(&set, ~_BLOCKABLE);
	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;

	block_sigmask(ka, sig);
	tracehook_signal_handler(sig, info, ka, regs,
				 test_thread_flag(TIF_SINGLESTEP));
}

/*
 * 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 | _TIF_RESTORE_SIGMASK))
		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
	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);
00f35785	167	set_current_blocked(&set);
b920de1b	168
7c7fcf76	169	if (restore_sigcontext(current_frame(), &frame->sc, &d0))
b920de1b DH	170	goto badframe;
	171
	172	return d0;
	173
	174	badframe:
	175	force_sig(SIGSEGV, current);
	176	return 0;
	177	}
	178
	179	/*
	180	* realtime signal return syscall
	181	*/
	182	asmlinkage long sys_rt_sigreturn(void)
	183	{
7c7fcf76	184	struct rt_sigframe __user *frame;
b920de1b	185	sigset_t set;
7c7fcf76	186	long d0;
b920de1b	187
7c7fcf76	188	frame = (struct rt_sigframe __user *) current_frame()->sp;
b920de1b DH	189	if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
	190	goto badframe;
	191	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
	192	goto badframe;
	193
	194	sigdelsetmask(&set, ~_BLOCKABLE);
00f35785	195	set_current_blocked(&set);
b920de1b	196
7c7fcf76	197	if (restore_sigcontext(current_frame(), &frame->uc.uc_mcontext, &d0))
b920de1b DH	198	goto badframe;
b920de1b DH	199
7c7fcf76 DH	200	if (do_sigaltstack(&frame->uc.uc_stack, NULL, current_frame()->sp) ==
7c7fcf76 DH	201	-EFAULT)
b920de1b DH	202	goto badframe;
	203
	204	return d0;
	205
	206	badframe:
	207	force_sig(SIGSEGV, current);
	208	return 0;
	209	}
	210
	211	/*
	212	* store the userspace context into a signal frame
	213	*/
	214	static int setup_sigcontext(struct sigcontext __user *sc,
	215	struct fpucontext *fpuctx,
	216	struct pt_regs *regs,
	217	unsigned long mask)
	218	{
	219	int tmp, err = 0;
	220
	221	#define COPY(x) err \|= __put_user(regs->x, &sc->x)
	222	COPY(d0); COPY(d1); COPY(d2); COPY(d3);
	223	COPY(a0); COPY(a1); COPY(a2); COPY(a3);
	224	COPY(e0); COPY(e1); COPY(e2); COPY(e3);
	225	COPY(e4); COPY(e5); COPY(e6); COPY(e7);
	226	COPY(lar); COPY(lir);
	227	COPY(mdr); COPY(mdrq);
	228	COPY(mcvf); COPY(mcrl); COPY(mcrh);
	229	COPY(sp); COPY(epsw); COPY(pc);
	230	#undef COPY
	231
	232	tmp = fpu_setup_sigcontext(fpuctx);
	233	if (tmp < 0)
	234	err = 1;
	235	else
	236	err \|= __put_user(tmp ? fpuctx : NULL, &sc->fpucontext);
	237
	238	/* non-iBCS2 extensions.. */
	239	err \|= __put_user(mask, &sc->oldmask);
	240
	241	return err;
	242	}
	243
	244	/*
	245	* determine which stack to use..
	246	*/
	247	static inline void __user get_sigframe(struct k_sigaction ka,
	248	struct pt_regs *regs,
	249	size_t frame_size)
	250	{
	251	unsigned long sp;
	252
	253	/* default to using normal stack */
	254	sp = regs->sp;
	255
	256	/* this is the X/Open sanctioned signal stack switching. */
	257	if (ka->sa.sa_flags & SA_ONSTACK) {
4c03ee73	258	if (sas_ss_flags(sp) == 0)
b920de1b DH	259	sp = current->sas_ss_sp + current->sas_ss_size;
	260	}
	261
	262	return (void __user *) ((sp - frame_size) & ~7UL);
	263	}
	264
	265	/*
	266	* set up a normal signal frame
	267	*/
	268	static int setup_frame(int sig, struct k_sigaction ka, sigset_t set,
	269	struct pt_regs *regs)
	270	{
	271	struct sigframe __user *frame;
	272	int rsig;
	273
	274	frame = get_sigframe(ka, regs, sizeof(*frame));
	275
	276	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	277	goto give_sigsegv;
	278
	279	rsig = sig;
	280	if (sig < 32 &&
	281	current_thread_info()->exec_domain &&
	282	current_thread_info()->exec_domain->signal_invmap)
	283	rsig = current_thread_info()->exec_domain->signal_invmap[sig];
	284
	285	if (__put_user(rsig, &frame->sig) < 0 \|\|
	286	__put_user(&frame->sc, &frame->psc) < 0)
	287	goto give_sigsegv;
	288
	289	if (setup_sigcontext(&frame->sc, &frame->fpuctx, regs, set->sig[0]))
	290	goto give_sigsegv;
	291
	292	if (_NSIG_WORDS > 1) {
	293	if (__copy_to_user(frame->extramask, &set->sig[1],
	294	sizeof(frame->extramask)))
	295	goto give_sigsegv;
	296	}
	297
	298	/* set up to return from userspace. If provided, use a stub already in
	299	* userspace */
	300	if (ka->sa.sa_flags & SA_RESTORER) {
	301	if (__put_user(ka->sa.sa_restorer, &frame->pretcode))
	302	goto give_sigsegv;
	303	} else {
	304	if (__put_user((void (*)(void))frame->retcode,
	305	&frame->pretcode))
	306	goto give_sigsegv;
	307	/* this is mov $,d0; syscall 0 */
	308	if (__put_user(0x2c, (char *)(frame->retcode + 0)) \|\|
	309	__put_user(__NR_sigreturn, (char *)(frame->retcode + 1)) \|\|
	310	__put_user(0x00, (char *)(frame->retcode + 2)) \|\|
	311	__put_user(0xf0, (char *)(frame->retcode + 3)) \|\|
	312	__put_user(0xe0, (char *)(frame->retcode + 4)))
	313	goto give_sigsegv;
	314	flush_icache_range((unsigned long) frame->retcode,
	315	(unsigned long) frame->retcode + 5);
	316	}
	317
	318	/* set up registers for signal handler */
	319	regs->sp = (unsigned long) frame;
	320	regs->pc = (unsigned long) ka->sa.sa_handler;
	321	regs->d0 = sig;
	322	regs->d1 = (unsigned long) &frame->sc;
323
b920de1b DH	324	/* the tracer may want to single-step inside the handler */
	325	if (test_thread_flag(TIF_SINGLESTEP))
	326	ptrace_notify(SIGTRAP);
	327
	328	#if DEBUG_SIG
	329	printk(KERN_DEBUG "SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
	330	sig, current->comm, current->pid, frame, regs->pc,
	331	frame->pretcode);
	332	#endif
	333
	334	return 0;
	335
	336	give_sigsegv:
e46924d2	337	force_sigsegv(sig, current);
b920de1b DH	338	return -EFAULT;
	339	}
	340
	341	/*
	342	* set up a realtime signal frame
	343	*/
	344	static int setup_rt_frame(int sig, struct k_sigaction ka, siginfo_t info,
	345	sigset_t set, struct pt_regs regs)
	346	{
	347	struct rt_sigframe __user *frame;
	348	int rsig;
	349
	350	frame = get_sigframe(ka, regs, sizeof(*frame));
	351
	352	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	353	goto give_sigsegv;
	354
	355	rsig = sig;
	356	if (sig < 32 &&
	357	current_thread_info()->exec_domain &&
	358	current_thread_info()->exec_domain->signal_invmap)
	359	rsig = current_thread_info()->exec_domain->signal_invmap[sig];
	360
	361	if (__put_user(rsig, &frame->sig) \|\|
	362	__put_user(&frame->info, &frame->pinfo) \|\|
	363	__put_user(&frame->uc, &frame->puc) \|\|
	364	copy_siginfo_to_user(&frame->info, info))
	365	goto give_sigsegv;
	366
	367	/* create the ucontext. */
	368	if (__put_user(0, &frame->uc.uc_flags) \|\|
	369	__put_user(0, &frame->uc.uc_link) \|\|
	370	__put_user((void *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp) \|\|
	371	__put_user(sas_ss_flags(regs->sp), &frame->uc.uc_stack.ss_flags) \|\|
	372	__put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size) \|\|
	373	setup_sigcontext(&frame->uc.uc_mcontext,
	374	&frame->fpuctx, regs, set->sig[0]) \|\|
	375	__copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)))
	376	goto give_sigsegv;
	377
	378	/* set up to return from userspace. If provided, use a stub already in
	379	* userspace */
	380	if (ka->sa.sa_flags & SA_RESTORER) {
	381	if (__put_user(ka->sa.sa_restorer, &frame->pretcode))
	382	goto give_sigsegv;
	383	} else {
	384	if (__put_user((void(*)(void))frame->retcode,
	385	&frame->pretcode) \|\|
	386	/* This is mov $,d0; syscall 0 */
	387	__put_user(0x2c, (char *)(frame->retcode + 0)) \|\|
	388	__put_user(__NR_rt_sigreturn,
	389	(char *)(frame->retcode + 1)) \|\|
	390	__put_user(0x00, (char *)(frame->retcode + 2)) \|\|
	391	__put_user(0xf0, (char *)(frame->retcode + 3)) \|\|
	392	__put_user(0xe0, (char *)(frame->retcode + 4)))
	393	goto give_sigsegv;
	394
	395	flush_icache_range((u_long) frame->retcode,
	396	(u_long) frame->retcode + 5);
	397	}
	398
	399	/* Set up registers for signal handler */
	400	regs->sp = (unsigned long) frame;
	401	regs->pc = (unsigned long) ka->sa.sa_handler;
402	regs->d0 = sig;
403	regs->d1 = (long) &frame->info;
404
b920de1b DH	405	/* the tracer may want to single-step inside the handler */
	406	if (test_thread_flag(TIF_SINGLESTEP))
	407	ptrace_notify(SIGTRAP);
	408
	409	#if DEBUG_SIG
	410	printk(KERN_DEBUG "SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
	411	sig, current->comm, current->pid, frame, regs->pc,
	412	frame->pretcode);
	413	#endif
	414
	415	return 0;
	416
	417	give_sigsegv:
e46924d2	418	force_sigsegv(sig, current);
b920de1b DH	419	return -EFAULT;
	420	}
	421
00cbf608 AV	422	static inline void stepback(struct pt_regs *regs)
	423	{
	424	regs->pc -= 2;
	425	regs->orig_d0 = -1;
	426	}
	427
b920de1b DH	428	/*
	429	* handle the actual delivery of a signal to userspace
	430	*/
	431	static int handle_signal(int sig,
	432	siginfo_t info, struct k_sigaction ka,
b7f9a11a	433	struct pt_regs *regs)
b920de1b	434	{
b7f9a11a	435	sigset_t *oldset = sigmask_to_save();
b920de1b DH	436	int ret;
	437
	438	/* Are we from a system call? */
	439	if (regs->orig_d0 >= 0) {
	440	/* If so, check system call restarting.. */
	441	switch (regs->d0) {
	442	case -ERESTART_RESTARTBLOCK:
	443	case -ERESTARTNOHAND:
	444	regs->d0 = -EINTR;
	445	break;
	446
	447	case -ERESTARTSYS:
	448	if (!(ka->sa.sa_flags & SA_RESTART)) {
	449	regs->d0 = -EINTR;
	450	break;
	451	}
	452
	453	/* fallthrough */
	454	case -ERESTARTNOINTR:
	455	regs->d0 = regs->orig_d0;
00cbf608	456	stepback(regs);
b920de1b DH	457	}
	458	}
	459
	460	/* Set up the stack frame */
	461	if (ka->sa.sa_flags & SA_SIGINFO)
	462	ret = setup_rt_frame(sig, ka, info, oldset, regs);
	463	else
	464	ret = setup_frame(sig, ka, oldset, regs);
a610d6e6 AV	465	if (ret)
a610d6e6 AV	466	return;
b920de1b	467
a610d6e6 AV	468	block_sigmask(ka, sig);
	469	tracehook_signal_handler(sig, info, ka, regs,
	470	test_thread_flag(TIF_SINGLESTEP));
b920de1b DH	471	}
	472
	473	/*
	474	* handle a potential signal
	475	*/
	476	static void do_signal(struct pt_regs *regs)
	477	{
	478	struct k_sigaction ka;
	479	siginfo_t info;
b920de1b DH	480	int signr;
	481
	482	/* we want the common case to go fast, which is why we may in certain
	483	* cases get here from kernel mode */
	484	if (!user_mode(regs))
	485	return;
	486
b920de1b DH	487	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
b920de1b DH	488	if (signr > 0) {
b7f9a11a	489	if (handle_signal(signr, &info, &ka, regs) == 0) {
b920de1b DH	490	}
	491
	492	return;
	493	}
	494
	495	/* did we come from a system call? */
	496	if (regs->orig_d0 >= 0) {
	497	/* restart the system call - no handlers present */
	498	switch (regs->d0) {
	499	case -ERESTARTNOHAND:
	500	case -ERESTARTSYS:
	501	case -ERESTARTNOINTR:
	502	regs->d0 = regs->orig_d0;
00cbf608	503	stepback(regs);
b920de1b DH	504	break;
	505
	506	case -ERESTART_RESTARTBLOCK:
	507	regs->d0 = __NR_restart_syscall;
00cbf608	508	stepback(regs);
b920de1b DH	509	break;
	510	}
	511	}
	512
	513	/* if there's no signal to deliver, we just put the saved sigmask
	514	* back */
51a7b448	515	restore_saved_sigmask();
b920de1b DH	516	}
	517
	518	/*
	519	* notification of userspace execution resumption
	520	* - triggered by current->work.notify_resume
	521	*/
	522	asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags)
	523	{
	524	/* Pending single-step? */
	525	if (thread_info_flags & _TIF_SINGLESTEP) {
	526	#ifndef CONFIG_MN10300_USING_JTAG
	527	regs->epsw \|= EPSW_T;
	528	clear_thread_flag(TIF_SINGLESTEP);
	529	#else
	530	BUG(); /* no h/w single-step if using JTAG unit */
	531	#endif
	532	}
	533
	534	/* deal with pending signal delivery */
	535	if (thread_info_flags & (_TIF_SIGPENDING \| _TIF_RESTORE_SIGMASK))
	536	do_signal(regs);
5d289964 DH	537
	538	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
	539	clear_thread_flag(TIF_NOTIFY_RESUME);
7c7fcf76	540	tracehook_notify_resume(current_frame());
5d289964	541	}
b920de1b	542	}