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

/*
 *  linux/arch/sh/kernel/signal.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  1997-11-28  Modified for POSIX.1b signals by Richard Henderson
 *
 *  SuperH version:  Copyright (C) 1999, 2000  Niibe Yutaka & Kaz Kojima
 *
 */
#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/elf.h>
#include <linux/personality.h>
#include <linux/binfmts.h>
#include <linux/freezer.h>
#include <asm/system.h>
#include <asm/ucontext.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/cacheflush.h>

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

/*
 * Atomically swap in the new signal mask, and wait for a signal.
 */
asmlinkage int
sys_sigsuspend(old_sigset_t mask,
	       unsigned long r5, unsigned long r6, unsigned long r7,
	       struct pt_regs __regs)
{
	mask &= _BLOCKABLE;
	spin_lock_irq(&current->sighand->siglock);
	current->saved_sigmask = current->blocked;
	siginitset(&current->blocked, mask);
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	current->state = TASK_INTERRUPTIBLE;
	schedule();
	set_thread_flag(TIF_RESTORE_SIGMASK);
	return -ERESTARTNOHAND;
}

asmlinkage int
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 (!access_ok(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))
			return -EFAULT;
		__get_user(new_ka.sa.sa_flags, &act->sa_flags);
		__get_user(mask, &act->sa_mask);
		siginitset(&new_ka.sa.sa_mask, mask);
	}

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

	if (!ret && oact) {
		if (!access_ok(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))
			return -EFAULT;
		__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
		__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
	}

	return ret;
}

asmlinkage int
sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
		unsigned long r6, unsigned long r7,
		struct pt_regs __regs)
{
	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);

	return do_sigaltstack(uss, uoss, regs->regs[15]);
}


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

#define MOVW(n)	 (0x9300|((n)-2))	/* Move mem word at PC+n to R3 */
#if defined(CONFIG_CPU_SH2)
#define TRAP_NOARG 0xc320		/* Syscall w/no args (NR in R3) */
#else
#define TRAP_NOARG 0xc310		/* Syscall w/no args (NR in R3) */
#endif
#define OR_R0_R0 0x200b			/* or r0,r0 (insert to avoid hardware bug) */

struct sigframe
{
	struct sigcontext sc;
	unsigned long extramask[_NSIG_WORDS-1];
	u16 retcode[8];
};

struct rt_sigframe
{
	struct siginfo info;
	struct ucontext uc;
	u16 retcode[8];
};

#ifdef CONFIG_SH_FPU
static inline int restore_sigcontext_fpu(struct sigcontext __user *sc)
{
	struct task_struct *tsk = current;

	if (!(current_cpu_data.flags & CPU_HAS_FPU))
		return 0;

	set_used_math();
	return __copy_from_user(&tsk->thread.fpu.hard, &sc->sc_fpregs[0],
				sizeof(long)*(16*2+2));
}

static inline int save_sigcontext_fpu(struct sigcontext __user *sc,
				      struct pt_regs *regs)
{
	struct task_struct *tsk = current;

	if (!(current_cpu_data.flags & CPU_HAS_FPU))
		return 0;

	if (!used_math()) {
		__put_user(0, &sc->sc_ownedfp);
		return 0;
	}

	__put_user(1, &sc->sc_ownedfp);

	/* This will cause a "finit" to be triggered by the next
	   attempted FPU operation by the 'current' process.
	   */
	clear_used_math();

	unlazy_fpu(tsk, regs);
	return __copy_to_user(&sc->sc_fpregs[0], &tsk->thread.fpu.hard,
			      sizeof(long)*(16*2+2));
}
#endif /* CONFIG_SH_FPU */

static int
restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p)
{
	unsigned int err = 0;

#define COPY(x)		err |= __get_user(regs->x, &sc->sc_##x)
			COPY(regs[1]);
	COPY(regs[2]);	COPY(regs[3]);
	COPY(regs[4]);	COPY(regs[5]);
	COPY(regs[6]);	COPY(regs[7]);
	COPY(regs[8]);	COPY(regs[9]);
	COPY(regs[10]);	COPY(regs[11]);
	COPY(regs[12]);	COPY(regs[13]);
	COPY(regs[14]);	COPY(regs[15]);
	COPY(gbr);	COPY(mach);
	COPY(macl);	COPY(pr);
	COPY(sr);	COPY(pc);
#undef COPY

#ifdef CONFIG_SH_FPU
	if (current_cpu_data.flags & CPU_HAS_FPU) {
		int owned_fp;
		struct task_struct *tsk = current;

		regs->sr |= SR_FD; /* Release FPU */
		clear_fpu(tsk, regs);
		clear_used_math();
		__get_user (owned_fp, &sc->sc_ownedfp);
		if (owned_fp)
			err |= restore_sigcontext_fpu(sc);
	}
#endif

	regs->tra = -1;		/* disable syscall checks */
	err |= __get_user(*r0_p, &sc->sc_regs[0]);
	return err;
}

asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5,
			     unsigned long r6, unsigned long r7,
			     struct pt_regs __regs)
{
	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
	struct sigframe __user *frame = (struct sigframe __user *)regs->regs[15];
	sigset_t set;
	int r0;

	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
		goto badframe;

	if (__get_user(set.sig[0], &frame->sc.oldmask)
	    || (_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(regs, &frame->sc, &r0))
		goto badframe;
	return r0;

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

asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5,
				unsigned long r6, unsigned long r7,
				struct pt_regs __regs)
{
	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
	struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->regs[15];
	sigset_t set;
	stack_t st;
	int r0;

	if (!access_ok(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(regs, &frame->uc.uc_mcontext, &r0))
		goto badframe;

	if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
		goto badframe;
	/* It is more difficult to avoid calling this function than to
	   call it and ignore errors.  */
	do_sigaltstack(&st, NULL, regs->regs[15]);

	return r0;

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

/*
 * Set up a signal frame.
 */

static int
setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
		 unsigned long mask)
{
	int err = 0;

#define COPY(x)		err |= __put_user(regs->x, &sc->sc_##x)
	COPY(regs[0]);	COPY(regs[1]);
	COPY(regs[2]);	COPY(regs[3]);
	COPY(regs[4]);	COPY(regs[5]);
	COPY(regs[6]);	COPY(regs[7]);
	COPY(regs[8]);	COPY(regs[9]);
	COPY(regs[10]);	COPY(regs[11]);
	COPY(regs[12]);	COPY(regs[13]);
	COPY(regs[14]);	COPY(regs[15]);
	COPY(gbr);	COPY(mach);
	COPY(macl);	COPY(pr);
	COPY(sr);	COPY(pc);
#undef COPY

#ifdef CONFIG_SH_FPU
	err |= save_sigcontext_fpu(sc, regs);
#endif

	/* 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, unsigned long sp, size_t frame_size)
{
	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) & -8ul);
}

/* These symbols are defined with the addresses in the vsyscall page.
   See vsyscall-trapa.S.  */
extern void __user __kernel_sigreturn;
extern void __user __kernel_rt_sigreturn;

static int setup_frame(int sig, struct k_sigaction *ka,
			sigset_t *set, struct pt_regs *regs)
{
	struct sigframe __user *frame;
	int err = 0;
	int signal;

	frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));

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

	signal = current_thread_info()->exec_domain
		&& current_thread_info()->exec_domain->signal_invmap
		&& sig < 32
		? current_thread_info()->exec_domain->signal_invmap[sig]
		: sig;

	err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);

	if (_NSIG_WORDS > 1)
		err |= __copy_to_user(frame->extramask, &set->sig[1],
				      sizeof(frame->extramask));

	/* Set up to return from userspace.  If provided, use a stub
	   already in userspace.  */
	if (ka->sa.sa_flags & SA_RESTORER) {
		regs->pr = (unsigned long) ka->sa.sa_restorer;
#ifdef CONFIG_VSYSCALL
	} else if (likely(current->mm->context.vdso)) {
		regs->pr = VDSO_SYM(&__kernel_sigreturn);
#endif
	} else {
		/* Generate return code (system call to sigreturn) */
		err |= __put_user(MOVW(7), &frame->retcode[0]);
		err |= __put_user(TRAP_NOARG, &frame->retcode[1]);
		err |= __put_user(OR_R0_R0, &frame->retcode[2]);
		err |= __put_user(OR_R0_R0, &frame->retcode[3]);
		err |= __put_user(OR_R0_R0, &frame->retcode[4]);
		err |= __put_user(OR_R0_R0, &frame->retcode[5]);
		err |= __put_user(OR_R0_R0, &frame->retcode[6]);
		err |= __put_user((__NR_sigreturn), &frame->retcode[7]);
		regs->pr = (unsigned long) frame->retcode;
	}

	if (err)
		goto give_sigsegv;

	/* Set up registers for signal handler */
	regs->regs[15] = (unsigned long) frame;
	regs->regs[4] = signal; /* Arg for signal handler */
	regs->regs[5] = 0;
	regs->regs[6] = (unsigned long) &frame->sc;
	regs->pc = (unsigned long) ka->sa.sa_handler;

	set_fs(USER_DS);

	pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
		 current->comm, current->pid, frame, regs->pc, regs->pr);

	flush_cache_sigtramp(regs->pr);

	if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode))
		flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES);

	return 0;

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

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 err = 0;
	int signal;

	frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));

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

	signal = current_thread_info()->exec_domain
		&& current_thread_info()->exec_domain->signal_invmap
		&& sig < 32
		? current_thread_info()->exec_domain->signal_invmap[sig]
		: sig;

	err |= copy_siginfo_to_user(&frame->info, info);

	/* Create the ucontext.  */
	err |= __put_user(0, &frame->uc.uc_flags);
	err |= __put_user(0, &frame->uc.uc_link);
	err |= __put_user((void *)current->sas_ss_sp,
			  &frame->uc.uc_stack.ss_sp);
	err |= __put_user(sas_ss_flags(regs->regs[15]),
			  &frame->uc.uc_stack.ss_flags);
	err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
	err |= setup_sigcontext(&frame->uc.uc_mcontext,
			        regs, set->sig[0]);
	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));

	/* Set up to return from userspace.  If provided, use a stub
	   already in userspace.  */
	if (ka->sa.sa_flags & SA_RESTORER) {
		regs->pr = (unsigned long) ka->sa.sa_restorer;
#ifdef CONFIG_VSYSCALL
	} else if (likely(current->mm->context.vdso)) {
		regs->pr = VDSO_SYM(&__kernel_rt_sigreturn);
#endif
	} else {
		/* Generate return code (system call to rt_sigreturn) */
		err |= __put_user(MOVW(7), &frame->retcode[0]);
		err |= __put_user(TRAP_NOARG, &frame->retcode[1]);
		err |= __put_user(OR_R0_R0, &frame->retcode[2]);
		err |= __put_user(OR_R0_R0, &frame->retcode[3]);
		err |= __put_user(OR_R0_R0, &frame->retcode[4]);
		err |= __put_user(OR_R0_R0, &frame->retcode[5]);
		err |= __put_user(OR_R0_R0, &frame->retcode[6]);
		err |= __put_user((__NR_rt_sigreturn), &frame->retcode[7]);
		regs->pr = (unsigned long) frame->retcode;
	}

	if (err)
		goto give_sigsegv;

	/* Set up registers for signal handler */
	regs->regs[15] = (unsigned long) frame;
	regs->regs[4] = signal; /* Arg for signal handler */
	regs->regs[5] = (unsigned long) &frame->info;
	regs->regs[6] = (unsigned long) &frame->uc;
	regs->pc = (unsigned long) ka->sa.sa_handler;

	set_fs(USER_DS);

	pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
		 current->comm, current->pid, frame, regs->pc, regs->pr);

	flush_cache_sigtramp(regs->pr);

	if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode))
		flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES);

	return 0;

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

/*
 * OK, we're invoking a handler
 */

static int
handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
	      sigset_t *oldset, struct pt_regs *regs, unsigned int save_r0)
{
	int ret;

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

			case -ERESTARTSYS:
				if (!(ka->sa.sa_flags & SA_RESTART)) {
					regs->regs[0] = -EINTR;
					break;
				}
			/* fallthrough */
			case -ERESTARTNOINTR:
				regs->regs[0] = save_r0;
				regs->pc -= instruction_size(
						ctrl_inw(regs->pc - 4));
				break;
		}
	} else {
		/* gUSA handling */
#ifdef CONFIG_PREEMPT
		unsigned long flags;

		local_irq_save(flags);
#endif
		if (regs->regs[15] >= 0xc0000000) {
			int offset = (int)regs->regs[15];

			/* Reset stack pointer: clear critical region mark */
			regs->regs[15] = regs->regs[1];
			if (regs->pc < regs->regs[0])
				/* Go to rewind point #1 */
				regs->pc = regs->regs[0] + offset -
					instruction_size(ctrl_inw(regs->pc-4));
		}
#ifdef CONFIG_PREEMPT
		local_irq_restore(flags);
#endif
	}

	/* 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 (ka->sa.sa_flags & SA_ONESHOT)
		ka->sa.sa_handler = SIG_DFL;

	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;
}

/*
 * 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.
 *
 * Note that we go through the signals twice: once to check the signals that
 * the kernel can handle, and then we build all the user-level signal handling
 * stack-frames in one go after that.
 */
static void do_signal(struct pt_regs *regs, unsigned int save_r0)
{
	siginfo_t info;
	int signr;
	struct k_sigaction ka;
	sigset_t *oldset;

	/*
	 * We want the common case to go fast, which
	 * is why we may in certain cases get here from
	 * kernel mode. Just return without doing anything
	 * if so.
	 */
	if (!user_mode(regs))
		return;

	if (try_to_freeze())
		goto no_signal;

	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) {
		/* Whee!  Actually deliver the signal.  */
		if (handle_signal(signr, &ka, &info, oldset, regs, save_r0)
		    == 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);
		}

		return;
	}

 no_signal:
	/* Did we come from a system call? */
	if (regs->tra >= 0) {
		/* Restart the system call - no handlers present */
		if (regs->regs[0] == -ERESTARTNOHAND ||
		    regs->regs[0] == -ERESTARTSYS ||
		    regs->regs[0] == -ERESTARTNOINTR) {
			regs->regs[0] = save_r0;
			regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
		} else if (regs->regs[0] == -ERESTART_RESTARTBLOCK) {
			regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
			regs->regs[3] = __NR_restart_syscall;
		}
	}

	/* 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);
	}
}

asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned int save_r0,
				 __u32 thread_info_flags)
{
	/* deal with pending signal delivery */
	if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
		do_signal(regs, save_r0);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/sh/kernel/signal.c
	3	*
	4	* Copyright (C) 1991, 1992 Linus Torvalds
	5	*
	6	* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
	7	*
	8	* SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
	9	*
	10	*/
1da177e4 LT	11	#include <linux/sched.h>
	12	#include <linux/mm.h>
	13	#include <linux/smp.h>
1da177e4 LT	14	#include <linux/kernel.h>
	15	#include <linux/signal.h>
	16	#include <linux/errno.h>
	17	#include <linux/wait.h>
	18	#include <linux/ptrace.h>
	19	#include <linux/unistd.h>
	20	#include <linux/stddef.h>
	21	#include <linux/tty.h>
19f9a34f	22	#include <linux/elf.h>
1da177e4 LT	23	#include <linux/personality.h>
1da177e4 LT	24	#include <linux/binfmts.h>
7dfb7103	25	#include <linux/freezer.h>
bd079997	26	#include <asm/system.h>
1da177e4 LT	27	#include <asm/ucontext.h>
	28	#include <asm/uaccess.h>
	29	#include <asm/pgtable.h>
	30	#include <asm/cacheflush.h>
	31
1da177e4 LT	32	#define _BLOCKABLE (~(sigmask(SIGKILL) \| sigmask(SIGSTOP)))
1da177e4 LT	33
1da177e4 LT	34	/*
	35	* Atomically swap in the new signal mask, and wait for a signal.
	36	*/
	37	asmlinkage int
	38	sys_sigsuspend(old_sigset_t mask,
	39	unsigned long r5, unsigned long r6, unsigned long r7,
f0bc814c	40	struct pt_regs __regs)
1da177e4	41	{
1da177e4 LT	42	mask &= _BLOCKABLE;
1da177e4 LT	43	spin_lock_irq(&current->sighand->siglock);
9f23e7e9	44	current->saved_sigmask = current->blocked;
1da177e4 LT	45	siginitset(&current->blocked, mask);
	46	recalc_sigpending();
	47	spin_unlock_irq(&current->sighand->siglock);
	48
9f23e7e9 PM	49	current->state = TASK_INTERRUPTIBLE;
	50	schedule();
	51	set_thread_flag(TIF_RESTORE_SIGMASK);
	52	return -ERESTARTNOHAND;
1da177e4 LT	53	}
1da177e4 LT	54
f0bc814c	55	asmlinkage int
1da177e4 LT	56	sys_sigaction(int sig, const struct old_sigaction __user *act,
	57	struct old_sigaction __user *oact)
	58	{
	59	struct k_sigaction new_ka, old_ka;
	60	int ret;
	61
	62	if (act) {
	63	old_sigset_t mask;
	64	if (!access_ok(VERIFY_READ, act, sizeof(*act)) \|\|
	65	__get_user(new_ka.sa.sa_handler, &act->sa_handler) \|\|
	66	__get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
	67	return -EFAULT;
	68	__get_user(new_ka.sa.sa_flags, &act->sa_flags);
	69	__get_user(mask, &act->sa_mask);
	70	siginitset(&new_ka.sa.sa_mask, mask);
	71	}
	72
	73	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	74
	75	if (!ret && oact) {
	76	if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) \|\|
	77	__put_user(old_ka.sa.sa_handler, &oact->sa_handler) \|\|
	78	__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
	79	return -EFAULT;
	80	__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
	81	__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
	82	}
	83
	84	return ret;
	85	}
	86
	87	asmlinkage int
	88	sys_sigaltstack(const stack_t __user uss, stack_t __user uoss,
	89	unsigned long r6, unsigned long r7,
f0bc814c	90	struct pt_regs __regs)
1da177e4	91	{
f0bc814c SM	92	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
	93
	94	return do_sigaltstack(uss, uoss, regs->regs[15]);
1da177e4 LT	95	}
	96
	97
	98	/*
	99	* Do a signal return; undo the signal stack.
	100	*/
	101
	102	#define MOVW(n) (0x9300\|((n)-2)) /* Move mem word at PC+n to R3 */
11cbb70e	103	#if defined(CONFIG_CPU_SH2)
9d4436a6 YS	104	#define TRAP_NOARG 0xc320 /* Syscall w/no args (NR in R3) */
	105	#else
	106	#define TRAP_NOARG 0xc310 /* Syscall w/no args (NR in R3) */
	107	#endif
1da177e4 LT	108	#define OR_R0_R0 0x200b /* or r0,r0 (insert to avoid hardware bug) */
	109
	110	struct sigframe
	111	{
	112	struct sigcontext sc;
	113	unsigned long extramask[_NSIG_WORDS-1];
	114	u16 retcode[8];
	115	};
	116
	117	struct rt_sigframe
	118	{
	119	struct siginfo info;
	120	struct ucontext uc;
	121	u16 retcode[8];
	122	};
	123
	124	#ifdef CONFIG_SH_FPU
	125	static inline int restore_sigcontext_fpu(struct sigcontext __user *sc)
	126	{
	127	struct task_struct *tsk = current;
	128
11c19656	129	if (!(current_cpu_data.flags & CPU_HAS_FPU))
1da177e4 LT	130	return 0;
	131
	132	set_used_math();
	133	return __copy_from_user(&tsk->thread.fpu.hard, &sc->sc_fpregs[0],
	134	sizeof(long)(162+2));
	135	}
	136
	137	static inline int save_sigcontext_fpu(struct sigcontext __user *sc,
	138	struct pt_regs *regs)
	139	{
	140	struct task_struct *tsk = current;
	141
11c19656	142	if (!(current_cpu_data.flags & CPU_HAS_FPU))
1da177e4 LT	143	return 0;
	144
	145	if (!used_math()) {
	146	__put_user(0, &sc->sc_ownedfp);
	147	return 0;
	148	}
	149
	150	__put_user(1, &sc->sc_ownedfp);
	151
	152	/* This will cause a "finit" to be triggered by the next
	153	attempted FPU operation by the 'current' process.
	154	*/
	155	clear_used_math();
	156
	157	unlazy_fpu(tsk, regs);
	158	return __copy_to_user(&sc->sc_fpregs[0], &tsk->thread.fpu.hard,
	159	sizeof(long)(162+2));
	160	}
	161	#endif /* CONFIG_SH_FPU */
	162
	163	static int
	164	restore_sigcontext(struct pt_regs regs, struct sigcontext __user sc, int *r0_p)
	165	{
	166	unsigned int err = 0;
	167
	168	#define COPY(x) err \|= __get_user(regs->x, &sc->sc_##x)
	169	COPY(regs[1]);
	170	COPY(regs[2]); COPY(regs[3]);
	171	COPY(regs[4]); COPY(regs[5]);
	172	COPY(regs[6]); COPY(regs[7]);
	173	COPY(regs[8]); COPY(regs[9]);
	174	COPY(regs[10]); COPY(regs[11]);
	175	COPY(regs[12]); COPY(regs[13]);
	176	COPY(regs[14]); COPY(regs[15]);
	177	COPY(gbr); COPY(mach);
	178	COPY(macl); COPY(pr);
	179	COPY(sr); COPY(pc);
	180	#undef COPY
	181
	182	#ifdef CONFIG_SH_FPU
11c19656	183	if (current_cpu_data.flags & CPU_HAS_FPU) {
1da177e4 LT	184	int owned_fp;
	185	struct task_struct *tsk = current;
	186
	187	regs->sr \|= SR_FD; /* Release FPU */
	188	clear_fpu(tsk, regs);
	189	clear_used_math();
	190	__get_user (owned_fp, &sc->sc_ownedfp);
	191	if (owned_fp)
	192	err \|= restore_sigcontext_fpu(sc);
	193	}
	194	#endif
	195
	196	regs->tra = -1; /* disable syscall checks */
	197	err \|= __get_user(*r0_p, &sc->sc_regs[0]);
	198	return err;
	199	}
	200
	201	asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5,
	202	unsigned long r6, unsigned long r7,
f0bc814c	203	struct pt_regs __regs)
1da177e4	204	{
f0bc814c SM	205	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
f0bc814c SM	206	struct sigframe __user frame = (struct sigframe __user )regs->regs[15];
1da177e4 LT	207	sigset_t set;
	208	int r0;
	209
	210	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	211	goto badframe;
	212
	213	if (__get_user(set.sig[0], &frame->sc.oldmask)
	214	\|\| (_NSIG_WORDS > 1
	215	&& __copy_from_user(&set.sig[1], &frame->extramask,
	216	sizeof(frame->extramask))))
	217	goto badframe;
	218
	219	sigdelsetmask(&set, ~_BLOCKABLE);
	220
	221	spin_lock_irq(&current->sighand->siglock);
	222	current->blocked = set;
	223	recalc_sigpending();
	224	spin_unlock_irq(&current->sighand->siglock);
	225
f0bc814c	226	if (restore_sigcontext(regs, &frame->sc, &r0))
1da177e4 LT	227	goto badframe;
	228	return r0;
	229
	230	badframe:
	231	force_sig(SIGSEGV, current);
	232	return 0;
	233	}
	234
	235	asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5,
	236	unsigned long r6, unsigned long r7,
f0bc814c	237	struct pt_regs __regs)
1da177e4	238	{
f0bc814c SM	239	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
f0bc814c SM	240	struct rt_sigframe __user frame = (struct rt_sigframe __user )regs->regs[15];
1da177e4 LT	241	sigset_t set;
	242	stack_t st;
	243	int r0;
	244
	245	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
	246	goto badframe;
	247
	248	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
	249	goto badframe;
	250
	251	sigdelsetmask(&set, ~_BLOCKABLE);
	252	spin_lock_irq(&current->sighand->siglock);
	253	current->blocked = set;
	254	recalc_sigpending();
	255	spin_unlock_irq(&current->sighand->siglock);
	256
f0bc814c	257	if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0))
1da177e4 LT	258	goto badframe;
	259
	260	if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
	261	goto badframe;
	262	/* It is more difficult to avoid calling this function than to
	263	call it and ignore errors. */
f0bc814c	264	do_sigaltstack(&st, NULL, regs->regs[15]);
1da177e4 LT	265
	266	return r0;
	267
	268	badframe:
	269	force_sig(SIGSEGV, current);
	270	return 0;
	271	}
	272
	273	/*
	274	* Set up a signal frame.
	275	*/
	276
	277	static int
	278	setup_sigcontext(struct sigcontext __user sc, struct pt_regs regs,
	279	unsigned long mask)
	280	{
	281	int err = 0;
	282
	283	#define COPY(x) err \|= __put_user(regs->x, &sc->sc_##x)
	284	COPY(regs[0]); COPY(regs[1]);
	285	COPY(regs[2]); COPY(regs[3]);
	286	COPY(regs[4]); COPY(regs[5]);
	287	COPY(regs[6]); COPY(regs[7]);
	288	COPY(regs[8]); COPY(regs[9]);
	289	COPY(regs[10]); COPY(regs[11]);
	290	COPY(regs[12]); COPY(regs[13]);
	291	COPY(regs[14]); COPY(regs[15]);
	292	COPY(gbr); COPY(mach);
	293	COPY(macl); COPY(pr);
	294	COPY(sr); COPY(pc);
	295	#undef COPY
	296
	297	#ifdef CONFIG_SH_FPU
	298	err \|= save_sigcontext_fpu(sc, regs);
	299	#endif
	300
	301	/* non-iBCS2 extensions.. */
	302	err \|= __put_user(mask, &sc->oldmask);
	303
	304	return err;
	305	}
	306
	307	/*
	308	* Determine which stack to use..
	309	*/
	310	static inline void __user *
	311	get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
	312	{
	313	if (ka->sa.sa_flags & SA_ONSTACK) {
	314	if (sas_ss_flags(sp) == 0)
	315	sp = current->sas_ss_sp + current->sas_ss_size;
	316	}
	317
	318	return (void __user *)((sp - frame_size) & -8ul);
	319	}
	320
19f9a34f PM	321	/* These symbols are defined with the addresses in the vsyscall page.
	322	See vsyscall-trapa.S. */
	323	extern void __user __kernel_sigreturn;
	324	extern void __user __kernel_rt_sigreturn;
	325
9f23e7e9	326	static int setup_frame(int sig, struct k_sigaction *ka,
1da177e4 LT	327	sigset_t set, struct pt_regs regs)
	328	{
	329	struct sigframe __user *frame;
	330	int err = 0;
	331	int signal;
	332
	333	frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));
	334
	335	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	336	goto give_sigsegv;
	337
	338	signal = current_thread_info()->exec_domain
	339	&& current_thread_info()->exec_domain->signal_invmap
	340	&& sig < 32
	341	? current_thread_info()->exec_domain->signal_invmap[sig]
	342	: sig;
	343
	344	err \|= setup_sigcontext(&frame->sc, regs, set->sig[0]);
	345
9f23e7e9	346	if (_NSIG_WORDS > 1)
1da177e4 LT	347	err \|= __copy_to_user(frame->extramask, &set->sig[1],
1da177e4 LT	348	sizeof(frame->extramask));
1da177e4 LT	349
	350	/* Set up to return from userspace. If provided, use a stub
	351	already in userspace. */
	352	if (ka->sa.sa_flags & SA_RESTORER) {
	353	regs->pr = (unsigned long) ka->sa.sa_restorer;
19f9a34f PM	354	#ifdef CONFIG_VSYSCALL
	355	} else if (likely(current->mm->context.vdso)) {
	356	regs->pr = VDSO_SYM(&__kernel_sigreturn);
	357	#endif
1da177e4 LT	358	} else {
	359	/* Generate return code (system call to sigreturn) */
	360	err \|= __put_user(MOVW(7), &frame->retcode[0]);
9d4436a6	361	err \|= __put_user(TRAP_NOARG, &frame->retcode[1]);
1da177e4 LT	362	err \|= __put_user(OR_R0_R0, &frame->retcode[2]);
	363	err \|= __put_user(OR_R0_R0, &frame->retcode[3]);
	364	err \|= __put_user(OR_R0_R0, &frame->retcode[4]);
	365	err \|= __put_user(OR_R0_R0, &frame->retcode[5]);
	366	err \|= __put_user(OR_R0_R0, &frame->retcode[6]);
	367	err \|= __put_user((__NR_sigreturn), &frame->retcode[7]);
	368	regs->pr = (unsigned long) frame->retcode;
	369	}
	370
	371	if (err)
	372	goto give_sigsegv;
	373
	374	/* Set up registers for signal handler */
	375	regs->regs[15] = (unsigned long) frame;
	376	regs->regs[4] = signal; /* Arg for signal handler */
	377	regs->regs[5] = 0;
	378	regs->regs[6] = (unsigned long) &frame->sc;
	379	regs->pc = (unsigned long) ka->sa.sa_handler;
	380
	381	set_fs(USER_DS);
	382
9f23e7e9 PM	383	pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
9f23e7e9 PM	384	current->comm, current->pid, frame, regs->pc, regs->pr);
1da177e4 LT	385
1da177e4 LT	386	flush_cache_sigtramp(regs->pr);
9f23e7e9	387
1da177e4 LT	388	if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode))
1da177e4 LT	389	flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES);
9f23e7e9 PM	390
9f23e7e9 PM	391	return 0;
1da177e4 LT	392
	393	give_sigsegv:
	394	force_sigsegv(sig, current);
9f23e7e9	395	return -EFAULT;
1da177e4 LT	396	}
1da177e4 LT	397
9f23e7e9	398	static int setup_rt_frame(int sig, struct k_sigaction ka, siginfo_t info,
1da177e4 LT	399	sigset_t set, struct pt_regs regs)
	400	{
	401	struct rt_sigframe __user *frame;
	402	int err = 0;
	403	int signal;
	404
	405	frame = get_sigframe(ka, regs->regs[15], sizeof(*frame));
	406
	407	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
	408	goto give_sigsegv;
	409
	410	signal = current_thread_info()->exec_domain
	411	&& current_thread_info()->exec_domain->signal_invmap
	412	&& sig < 32
	413	? current_thread_info()->exec_domain->signal_invmap[sig]
	414	: sig;
	415
	416	err \|= copy_siginfo_to_user(&frame->info, info);
	417
	418	/* Create the ucontext. */
	419	err \|= __put_user(0, &frame->uc.uc_flags);
	420	err \|= __put_user(0, &frame->uc.uc_link);
	421	err \|= __put_user((void *)current->sas_ss_sp,
	422	&frame->uc.uc_stack.ss_sp);
	423	err \|= __put_user(sas_ss_flags(regs->regs[15]),
	424	&frame->uc.uc_stack.ss_flags);
	425	err \|= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
	426	err \|= setup_sigcontext(&frame->uc.uc_mcontext,
	427	regs, set->sig[0]);
	428	err \|= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
	429
	430	/* Set up to return from userspace. If provided, use a stub
	431	already in userspace. */
	432	if (ka->sa.sa_flags & SA_RESTORER) {
	433	regs->pr = (unsigned long) ka->sa.sa_restorer;
19f9a34f PM	434	#ifdef CONFIG_VSYSCALL
	435	} else if (likely(current->mm->context.vdso)) {
	436	regs->pr = VDSO_SYM(&__kernel_rt_sigreturn);
	437	#endif
1da177e4 LT	438	} else {
	439	/* Generate return code (system call to rt_sigreturn) */
	440	err \|= __put_user(MOVW(7), &frame->retcode[0]);
9d4436a6	441	err \|= __put_user(TRAP_NOARG, &frame->retcode[1]);
1da177e4 LT	442	err \|= __put_user(OR_R0_R0, &frame->retcode[2]);
	443	err \|= __put_user(OR_R0_R0, &frame->retcode[3]);
	444	err \|= __put_user(OR_R0_R0, &frame->retcode[4]);
	445	err \|= __put_user(OR_R0_R0, &frame->retcode[5]);
	446	err \|= __put_user(OR_R0_R0, &frame->retcode[6]);
	447	err \|= __put_user((__NR_rt_sigreturn), &frame->retcode[7]);
	448	regs->pr = (unsigned long) frame->retcode;
	449	}
	450
	451	if (err)
	452	goto give_sigsegv;
	453
	454	/* Set up registers for signal handler */
	455	regs->regs[15] = (unsigned long) frame;
	456	regs->regs[4] = signal; /* Arg for signal handler */
	457	regs->regs[5] = (unsigned long) &frame->info;
	458	regs->regs[6] = (unsigned long) &frame->uc;
	459	regs->pc = (unsigned long) ka->sa.sa_handler;
	460
	461	set_fs(USER_DS);
	462
9f23e7e9 PM	463	pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
9f23e7e9 PM	464	current->comm, current->pid, frame, regs->pc, regs->pr);
1da177e4 LT	465
1da177e4 LT	466	flush_cache_sigtramp(regs->pr);
9f23e7e9	467
1da177e4 LT	468	if ((-regs->pr & (L1_CACHE_BYTES-1)) < sizeof(frame->retcode))
1da177e4 LT	469	flush_cache_sigtramp(regs->pr + L1_CACHE_BYTES);
9f23e7e9 PM	470
9f23e7e9 PM	471	return 0;
1da177e4 LT	472
	473	give_sigsegv:
	474	force_sigsegv(sig, current);
9f23e7e9	475	return -EFAULT;
1da177e4 LT	476	}
	477
	478	/*
	479	* OK, we're invoking a handler
	480	*/
	481
9f23e7e9	482	static int
1da177e4	483	handle_signal(unsigned long sig, struct k_sigaction ka, siginfo_t info,
69a33147	484	sigset_t oldset, struct pt_regs regs, unsigned int save_r0)
1da177e4	485	{
9f23e7e9 PM	486	int ret;
9f23e7e9 PM	487
1da177e4 LT	488	/* Are we from a system call? */
	489	if (regs->tra >= 0) {
	490	/* If so, check system call restarting.. */
	491	switch (regs->regs[0]) {
	492	case -ERESTARTNOHAND:
	493	regs->regs[0] = -EINTR;
	494	break;
	495
	496	case -ERESTARTSYS:
	497	if (!(ka->sa.sa_flags & SA_RESTART)) {
	498	regs->regs[0] = -EINTR;
	499	break;
	500	}
	501	/* fallthrough */
	502	case -ERESTARTNOINTR:
69a33147	503	regs->regs[0] = save_r0;
53f983a9 PM	504	regs->pc -= instruction_size(
	505	ctrl_inw(regs->pc - 4));
	506	break;
1da177e4 LT	507	}
	508	} else {
	509	/* gUSA handling */
	510	#ifdef CONFIG_PREEMPT
	511	unsigned long flags;
	512
	513	local_irq_save(flags);
	514	#endif
	515	if (regs->regs[15] >= 0xc0000000) {
	516	int offset = (int)regs->regs[15];
	517
	518	/* Reset stack pointer: clear critical region mark */
	519	regs->regs[15] = regs->regs[1];
	520	if (regs->pc < regs->regs[0])
	521	/* Go to rewind point #1 */
53f983a9 PM	522	regs->pc = regs->regs[0] + offset -
53f983a9 PM	523	instruction_size(ctrl_inw(regs->pc-4));
1da177e4 LT	524	}
	525	#ifdef CONFIG_PREEMPT
	526	local_irq_restore(flags);
	527	#endif
	528	}
	529
	530	/* Set up the stack frame */
	531	if (ka->sa.sa_flags & SA_SIGINFO)
9f23e7e9	532	ret = setup_rt_frame(sig, ka, info, oldset, regs);
1da177e4	533	else
9f23e7e9	534	ret = setup_frame(sig, ka, oldset, regs);
1da177e4 LT	535
	536	if (ka->sa.sa_flags & SA_ONESHOT)
	537	ka->sa.sa_handler = SIG_DFL;
	538
9f23e7e9 PM	539	if (ret == 0) {
	540	spin_lock_irq(&current->sighand->siglock);
	541	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
	542	if (!(ka->sa.sa_flags & SA_NODEFER))
	543	sigaddset(&current->blocked,sig);
	544	recalc_sigpending();
	545	spin_unlock_irq(&current->sighand->siglock);
	546	}
	547
	548	return ret;
1da177e4 LT	549	}
	550
	551	/*
	552	* Note that 'init' is a special process: it doesn't get signals it doesn't
	553	* want to handle. Thus you cannot kill init even with a SIGKILL even by
	554	* mistake.
	555	*
	556	* Note that we go through the signals twice: once to check the signals that
	557	* the kernel can handle, and then we build all the user-level signal handling
	558	* stack-frames in one go after that.
	559	*/
9f23e7e9	560	static void do_signal(struct pt_regs *regs, unsigned int save_r0)
1da177e4 LT	561	{
	562	siginfo_t info;
	563	int signr;
	564	struct k_sigaction ka;
9f23e7e9	565	sigset_t *oldset;
1da177e4 LT	566
	567	/*
	568	* We want the common case to go fast, which
	569	* is why we may in certain cases get here from
	570	* kernel mode. Just return without doing anything
	571	* if so.
	572	*/
	573	if (!user_mode(regs))
9f23e7e9	574	return;
1da177e4	575
0e6c1f5f	576	if (try_to_freeze())
1da177e4 LT	577	goto no_signal;
1da177e4 LT	578
9f23e7e9 PM	579	if (test_thread_flag(TIF_RESTORE_SIGMASK))
	580	oldset = &current->saved_sigmask;
	581	else
1da177e4 LT	582	oldset = &current->blocked;
	583
	584	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
	585	if (signr > 0) {
	586	/* Whee! Actually deliver the signal. */
69a33147 KK	587	if (handle_signal(signr, &ka, &info, oldset, regs, save_r0)
69a33147 KK	588	== 0) {
9f23e7e9 PM	589	/* a signal was successfully delivered; the saved
	590	* sigmask will have been stored in the signal frame,
	591	* and will be restored by sigreturn, so we can simply
	592	* clear the TIF_RESTORE_SIGMASK flag */
	593	if (test_thread_flag(TIF_RESTORE_SIGMASK))
	594	clear_thread_flag(TIF_RESTORE_SIGMASK);
	595	}
c8bfa1fd RS	596
c8bfa1fd RS	597	return;
1da177e4 LT	598	}
	599
	600	no_signal:
	601	/* Did we come from a system call? */
	602	if (regs->tra >= 0) {
	603	/* Restart the system call - no handlers present */
	604	if (regs->regs[0] == -ERESTARTNOHAND \|\|
	605	regs->regs[0] == -ERESTARTSYS \|\|
0b892935	606	regs->regs[0] == -ERESTARTNOINTR) {
c8bfa1fd	607	regs->regs[0] = save_r0;
53f983a9	608	regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
0b892935	609	} else if (regs->regs[0] == -ERESTART_RESTARTBLOCK) {
53f983a9	610	regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
0b892935	611	regs->regs[3] = __NR_restart_syscall;
1da177e4 LT	612	}
1da177e4 LT	613	}
9f23e7e9 PM	614
	615	/* if there's no signal to deliver, we just put the saved sigmask
	616	* back */
	617	if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
	618	clear_thread_flag(TIF_RESTORE_SIGMASK);
	619	sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
	620	}
	621	}
	622
	623	asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned int save_r0,
	624	__u32 thread_info_flags)
	625	{
	626	/* deal with pending signal delivery */
	627	if (thread_info_flags & (_TIF_SIGPENDING \| _TIF_RESTORE_SIGMASK))
	628	do_signal(regs, save_r0);
1da177e4	629	}