arch/v850/kernel/signal.c - third_party/linux - Git at Google

 /*
  * arch/v850/kernel/signal.c -- Signal handling
  *
  *  Copyright (C) 2001,02,03  NEC Electronics Corporation
  *  Copyright (C) 2001,02,03  Miles Bader <miles@gnu.org>
  *  Copyright (C) 1999,2000,2002  Niibe Yutaka & Kaz Kojima
  *  Copyright (C) 1991,1992  Linus Torvalds
  *
  * This file is subject to the terms and conditions of the GNU General
  * Public License.  See the file COPYING in the main directory of this
  * archive for more details.
  *
  * 1997-11-28  Modified for POSIX.1b signals by Richard Henderson
  *
  * This file was derived from the sh version, arch/sh/kernel/signal.c
  */

 #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/personality.h>
 #include <linux/tty.h>

 #include <asm/ucontext.h>
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
 #include <asm/pgalloc.h>
 #include <asm/thread_info.h>
 #include <asm/cacheflush.h>

 #define DEBUG_SIG 0

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

 asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset);

 /*
  * Atomically swap in the new signal mask, and wait for a signal.
  */
 asmlinkage int
 sys_sigsuspend(old_sigset_t mask, struct pt_regs *regs)
 {
 	sigset_t saveset;

 	mask &= _BLOCKABLE;
 	spin_lock_irq(&current->sighand->siglock);
 	saveset = current->blocked;
 	siginitset(&current->blocked, mask);
 	recalc_sigpending();
 	spin_unlock_irq(&current->sighand->siglock);

 	regs->gpr[GPR_RVAL] = -EINTR;
 	while (1) {
 		current->state = TASK_INTERRUPTIBLE;
 		schedule();
 		if (do_signal(regs, &saveset))
 			return -EINTR;
 	}
 }

 asmlinkage int
 sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize,
 		  struct pt_regs *regs)
 {
 	sigset_t saveset, newset;

 	/* XXX: Don't preclude handling different sized sigset_t's.  */
 	if (sigsetsize != sizeof(sigset_t))
 		return -EINVAL;

 	if (copy_from_user(&newset, unewset, sizeof(newset)))
 		return -EFAULT;
 	sigdelsetmask(&newset, ~_BLOCKABLE);
 	spin_lock_irq(&current->sighand->siglock);
 	saveset = current->blocked;
 	current->blocked = newset;
 	recalc_sigpending();
 	spin_unlock_irq(&current->sighand->siglock);

 	regs->gpr[GPR_RVAL] = -EINTR;
 	while (1) {
 		current->state = TASK_INTERRUPTIBLE;
 		schedule();
 		if (do_signal(regs, &saveset))
 			return -EINTR;
 	}
 }

 asmlinkage int
 sys_sigaction(int sig, const struct old_sigaction *act,
 	      struct old_sigaction *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 *uss, stack_t *uoss,
 		struct pt_regs *regs)
 {
 	return do_sigaltstack(uss, uoss, regs->gpr[GPR_SP]);
 }


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

 struct sigframe
 {
 	struct sigcontext sc;
 	unsigned long extramask[_NSIG_WORDS-1];
 	unsigned long tramp[2];	/* signal trampoline */
 };

 struct rt_sigframe
 {
 	struct siginfo info;
 	struct ucontext uc;
 	unsigned long tramp[2];	/* signal trampoline */
 };

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

 #define COPY(x)		err |= __get_user(regs->x, &sc->regs.x)
 	COPY(gpr[0]);	COPY(gpr[1]);	COPY(gpr[2]);	COPY(gpr[3]);
 	COPY(gpr[4]);	COPY(gpr[5]);	COPY(gpr[6]);	COPY(gpr[7]);
 	COPY(gpr[8]);	COPY(gpr[9]);	COPY(gpr[10]);	COPY(gpr[11]);
 	COPY(gpr[12]);	COPY(gpr[13]);	COPY(gpr[14]);	COPY(gpr[15]);
 	COPY(gpr[16]);	COPY(gpr[17]);	COPY(gpr[18]);	COPY(gpr[19]);
 	COPY(gpr[20]);	COPY(gpr[21]);	COPY(gpr[22]);	COPY(gpr[23]);
 	COPY(gpr[24]);	COPY(gpr[25]);	COPY(gpr[26]);	COPY(gpr[27]);
 	COPY(gpr[28]);	COPY(gpr[29]);	COPY(gpr[30]);	COPY(gpr[31]);
 	COPY(pc);	COPY(psw);
 	COPY(ctpc);	COPY(ctpsw);	COPY(ctbp);
 #undef COPY

 	return err;
 }

 asmlinkage int sys_sigreturn(struct pt_regs *regs)
 {
 	struct sigframe *frame = (struct sigframe *)regs->gpr[GPR_SP];
 	sigset_t set;
 	int rval;

 	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, &rval))
 		goto badframe;
 	return rval;

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

 asmlinkage int sys_rt_sigreturn(struct pt_regs *regs)
 {
 	struct rt_sigframe *frame = (struct rt_sigframe *)regs->gpr[GPR_SP];
 	sigset_t set;
 	stack_t st;
 	int rval;

 	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, &rval))
 		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->gpr[GPR_SP]);

 	return rval;

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

 /*
  * Set up a signal frame.
  */

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

 #define COPY(x)		err |= __put_user(regs->x, &sc->regs.x)
 	COPY(gpr[0]);	COPY(gpr[1]);	COPY(gpr[2]);	COPY(gpr[3]);
 	COPY(gpr[4]);	COPY(gpr[5]);	COPY(gpr[6]);	COPY(gpr[7]);
 	COPY(gpr[8]);	COPY(gpr[9]);	COPY(gpr[10]);	COPY(gpr[11]);
 	COPY(gpr[12]);	COPY(gpr[13]);	COPY(gpr[14]);	COPY(gpr[15]);
 	COPY(gpr[16]);	COPY(gpr[17]);	COPY(gpr[18]);	COPY(gpr[19]);
 	COPY(gpr[20]);	COPY(gpr[21]);	COPY(gpr[22]);	COPY(gpr[23]);
 	COPY(gpr[24]);	COPY(gpr[25]);	COPY(gpr[26]);	COPY(gpr[27]);
 	COPY(gpr[28]);	COPY(gpr[29]);	COPY(gpr[30]);	COPY(gpr[31]);
 	COPY(pc);	COPY(psw);
 	COPY(ctpc);	COPY(ctpsw);	COPY(ctbp);
 #undef COPY

 	err |= __put_user(mask, &sc->oldmask);

 	return err;
 }

 /*
  * Determine which stack to use..
  */
 static inline void *
 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
 {
 	/* Default to using normal stack */
 	unsigned long sp = regs->gpr[GPR_SP];

 	if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp))
 		sp = current->sas_ss_sp + current->sas_ss_size;

 	return (void *)((sp - frame_size) & -8UL);
 }

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

 	frame = get_sigframe(ka, regs, 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->gpr[GPR_LP] = (unsigned long) ka->sa.sa_restorer;
 	} else {
 		/* Note, these encodings are _little endian_!  */

 		/* addi  __NR_sigreturn, r0, r12  */
 		err |= __put_user(0x6600 | (__NR_sigreturn << 16),
 				  frame->tramp + 0);
 		/* trap 0 */
 		err |= __put_user(0x010007e0,
 				  frame->tramp + 1);

 		regs->gpr[GPR_LP] = (unsigned long)frame->tramp;

 		flush_cache_sigtramp (regs->gpr[GPR_LP]);
 	}

 	if (err)
 		goto give_sigsegv;

 	/* Set up registers for signal handler.  */
 	regs->pc = (v850_reg_t) ka->sa.sa_handler;
 	regs->gpr[GPR_SP] = (v850_reg_t)frame;
 	/* Signal handler args:  */
 	regs->gpr[GPR_ARG0] = signal; /* arg 0: signum */
 	regs->gpr[GPR_ARG1] = (v850_reg_t)&frame->sc;/* arg 1: sigcontext */

 	set_fs(USER_DS);

 #if DEBUG_SIG
 	printk("SIG deliver (%s:%d): sp=%p pc=%08lx ra=%08lx\n",
 		current->comm, current->pid, frame, regs->pc, );
 #endif

 	return;

 give_sigsegv:
 	force_sigsegv(sig, current);
 }

 static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 			   sigset_t *set, struct pt_regs *regs)
 {
 	struct rt_sigframe *frame;
 	int err = 0;
 	int signal;

 	frame = get_sigframe(ka, regs, 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->gpr[GPR_SP]),
 			  &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->gpr[GPR_LP] = (unsigned long) ka->sa.sa_restorer;
 	} else {
 		/* Note, these encodings are _little endian_!  */

 		/* addi  __NR_sigreturn, r0, r12  */
 		err |= __put_user(0x6600 | (__NR_sigreturn << 16),
 				  frame->tramp + 0);
 		/* trap 0 */
 		err |= __put_user(0x010007e0,
 				  frame->tramp + 1);

 		regs->gpr[GPR_LP] = (unsigned long)frame->tramp;

 		flush_cache_sigtramp (regs->gpr[GPR_LP]);
 	}

 	if (err)
 		goto give_sigsegv;

 	/* Set up registers for signal handler.  */
 	regs->pc = (v850_reg_t) ka->sa.sa_handler;
 	regs->gpr[GPR_SP] = (v850_reg_t)frame;
 	/* Signal handler args:  */
 	regs->gpr[GPR_ARG0] = signal; /* arg 0: signum */
 	regs->gpr[GPR_ARG1] = (v850_reg_t)&frame->info; /* arg 1: siginfo */
 	regs->gpr[GPR_ARG2] = (v850_reg_t)&frame->uc; /* arg 2: ucontext */

 	set_fs(USER_DS);

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

 	return;

 give_sigsegv:
 	force_sigsegv(sig, current);
 }

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

 static void
 handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
 	      sigset_t *oldset,	struct pt_regs * regs)
 {
 	/* Are we from a system call? */
 	if (PT_REGS_SYSCALL (regs)) {
 		/* If so, check system call restarting.. */
 		switch (regs->gpr[GPR_RVAL]) {
 		case -ERESTART_RESTARTBLOCK:
 			current_thread_info()->restart_block.fn =
 				do_no_restart_syscall;
 			/* fall through */
 		case -ERESTARTNOHAND:
 			regs->gpr[GPR_RVAL] = -EINTR;
 			break;

 		case -ERESTARTSYS:
 			if (!(ka->sa.sa_flags & SA_RESTART)) {
 				regs->gpr[GPR_RVAL] = -EINTR;
 				break;
 			}
 			/* fallthrough */
 		case -ERESTARTNOINTR:
 			regs->gpr[12] = PT_REGS_SYSCALL (regs);
 			regs->pc -= 4; /* Size of `trap 0' insn.  */
 		}

 		PT_REGS_SET_SYSCALL (regs, 0);
 	}

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

 	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);
 }

 /*
  * 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.
  */
 int do_signal(struct pt_regs *regs, sigset_t *oldset)
 {
 	siginfo_t info;
 	int signr;
 	struct k_sigaction ka;

 	/*
 	 * 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 1;

 	if (!oldset)
 		oldset = &current->blocked;

 	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
 	if (signr > 0) {
 		/* Whee!  Actually deliver the signal.  */
 		handle_signal(signr, &info, &ka, oldset, regs);
 		return 1;
 	}

 	/* Did we come from a system call? */
 	if (PT_REGS_SYSCALL (regs)) {
 		int rval = (int)regs->gpr[GPR_RVAL];
 		/* Restart the system call - no handlers present */
 		if (rval == -ERESTARTNOHAND
 		    || rval == -ERESTARTSYS
 		    || rval == -ERESTARTNOINTR)
 		{
 			regs->gpr[12] = PT_REGS_SYSCALL (regs);
 			regs->pc -= 4; /* Size of `trap 0' insn.  */
 		}
 		else if (rval == -ERESTART_RESTARTBLOCK) {
 			regs->gpr[12] = __NR_restart_syscall;
 			regs->pc -= 4; /* Size of `trap 0' insn.  */
 		}
 	}
 	return 0;
 }
	/*
	* arch/v850/kernel/signal.c -- Signal handling
	*
	* Copyright (C) 2001,02,03 NEC Electronics Corporation
	* Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org>
	* Copyright (C) 1999,2000,2002 Niibe Yutaka & Kaz Kojima
	* Copyright (C) 1991,1992 Linus Torvalds
	*
	* This file is subject to the terms and conditions of the GNU General
	* Public License. See the file COPYING in the main directory of this
	* archive for more details.
	*
	* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
	*
	* This file was derived from the sh version, arch/sh/kernel/signal.c
	*/

	#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/personality.h>
	#include <linux/tty.h>

	#include <asm/ucontext.h>
	#include <asm/uaccess.h>
	#include <asm/pgtable.h>
	#include <asm/pgalloc.h>
	#include <asm/thread_info.h>
	#include <asm/cacheflush.h>

	#define DEBUG_SIG 0

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

	asmlinkage int do_signal(struct pt_regs regs, sigset_t oldset);

	/*
	* Atomically swap in the new signal mask, and wait for a signal.
	*/
	asmlinkage int
	sys_sigsuspend(old_sigset_t mask, struct pt_regs *regs)
	{
	sigset_t saveset;

	mask &= _BLOCKABLE;
	spin_lock_irq(&current->sighand->siglock);
	saveset = current->blocked;
	siginitset(&current->blocked, mask);
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	regs->gpr[GPR_RVAL] = -EINTR;
	while (1) {
	current->state = TASK_INTERRUPTIBLE;
	schedule();
	if (do_signal(regs, &saveset))
	return -EINTR;
	}
	}

	asmlinkage int
	sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize,
	struct pt_regs *regs)
	{
	sigset_t saveset, newset;

	/* XXX: Don't preclude handling different sized sigset_t's. */
	if (sigsetsize != sizeof(sigset_t))
	return -EINVAL;

	if (copy_from_user(&newset, unewset, sizeof(newset)))
	return -EFAULT;
	sigdelsetmask(&newset, ~_BLOCKABLE);
	spin_lock_irq(&current->sighand->siglock);
	saveset = current->blocked;
	current->blocked = newset;
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	regs->gpr[GPR_RVAL] = -EINTR;
	while (1) {
	current->state = TASK_INTERRUPTIBLE;
	schedule();
	if (do_signal(regs, &saveset))
	return -EINTR;
	}
	}

	asmlinkage int
	sys_sigaction(int sig, const struct old_sigaction *act,
	struct old_sigaction *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 uss, stack_t uoss,
	struct pt_regs *regs)
	{
	return do_sigaltstack(uss, uoss, regs->gpr[GPR_SP]);
	}


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

	struct sigframe
	{
	struct sigcontext sc;
	unsigned long extramask[_NSIG_WORDS-1];
	unsigned long tramp[2]; /* signal trampoline */
	};

	struct rt_sigframe
	{
	struct siginfo info;
	struct ucontext uc;
	unsigned long tramp[2]; /* signal trampoline */
	};

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

	#define COPY(x) err \|= __get_user(regs->x, &sc->regs.x)
	COPY(gpr[0]); COPY(gpr[1]); COPY(gpr[2]); COPY(gpr[3]);
	COPY(gpr[4]); COPY(gpr[5]); COPY(gpr[6]); COPY(gpr[7]);
	COPY(gpr[8]); COPY(gpr[9]); COPY(gpr[10]); COPY(gpr[11]);
	COPY(gpr[12]); COPY(gpr[13]); COPY(gpr[14]); COPY(gpr[15]);
	COPY(gpr[16]); COPY(gpr[17]); COPY(gpr[18]); COPY(gpr[19]);
	COPY(gpr[20]); COPY(gpr[21]); COPY(gpr[22]); COPY(gpr[23]);
	COPY(gpr[24]); COPY(gpr[25]); COPY(gpr[26]); COPY(gpr[27]);
	COPY(gpr[28]); COPY(gpr[29]); COPY(gpr[30]); COPY(gpr[31]);
	COPY(pc); COPY(psw);
	COPY(ctpc); COPY(ctpsw); COPY(ctbp);
	#undef COPY

	return err;
	}

	asmlinkage int sys_sigreturn(struct pt_regs *regs)
	{
	struct sigframe frame = (struct sigframe )regs->gpr[GPR_SP];
	sigset_t set;
	int rval;

	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, &rval))
	goto badframe;
	return rval;

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

	asmlinkage int sys_rt_sigreturn(struct pt_regs *regs)
	{
	struct rt_sigframe frame = (struct rt_sigframe )regs->gpr[GPR_SP];
	sigset_t set;
	stack_t st;
	int rval;

	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, &rval))
	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->gpr[GPR_SP]);

	return rval;

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

	/*
	* Set up a signal frame.
	*/

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

	#define COPY(x) err \|= __put_user(regs->x, &sc->regs.x)
	COPY(gpr[0]); COPY(gpr[1]); COPY(gpr[2]); COPY(gpr[3]);
	COPY(gpr[4]); COPY(gpr[5]); COPY(gpr[6]); COPY(gpr[7]);
	COPY(gpr[8]); COPY(gpr[9]); COPY(gpr[10]); COPY(gpr[11]);
	COPY(gpr[12]); COPY(gpr[13]); COPY(gpr[14]); COPY(gpr[15]);
	COPY(gpr[16]); COPY(gpr[17]); COPY(gpr[18]); COPY(gpr[19]);
	COPY(gpr[20]); COPY(gpr[21]); COPY(gpr[22]); COPY(gpr[23]);
	COPY(gpr[24]); COPY(gpr[25]); COPY(gpr[26]); COPY(gpr[27]);
	COPY(gpr[28]); COPY(gpr[29]); COPY(gpr[30]); COPY(gpr[31]);
	COPY(pc); COPY(psw);
	COPY(ctpc); COPY(ctpsw); COPY(ctbp);
	#undef COPY

	err \|= __put_user(mask, &sc->oldmask);

	return err;
	}

	/*
	* Determine which stack to use..
	*/
	static inline void *
	get_sigframe(struct k_sigaction ka, struct pt_regs regs, size_t frame_size)
	{
	/* Default to using normal stack */
	unsigned long sp = regs->gpr[GPR_SP];

	if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp))
	sp = current->sas_ss_sp + current->sas_ss_size;

	return (void *)((sp - frame_size) & -8UL);
	}

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

	frame = get_sigframe(ka, regs, 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->gpr[GPR_LP] = (unsigned long) ka->sa.sa_restorer;
	} else {
	/* Note, these encodings are _little endian_! */

	/* addi __NR_sigreturn, r0, r12 */
	err \|= __put_user(0x6600 \| (__NR_sigreturn << 16),
	frame->tramp + 0);
	/* trap 0 */
	err \|= __put_user(0x010007e0,
	frame->tramp + 1);

	regs->gpr[GPR_LP] = (unsigned long)frame->tramp;

	flush_cache_sigtramp (regs->gpr[GPR_LP]);
	}

	if (err)
	goto give_sigsegv;

	/* Set up registers for signal handler. */
	regs->pc = (v850_reg_t) ka->sa.sa_handler;
	regs->gpr[GPR_SP] = (v850_reg_t)frame;
	/* Signal handler args: */
	regs->gpr[GPR_ARG0] = signal; /* arg 0: signum */
	regs->gpr[GPR_ARG1] = (v850_reg_t)&frame->sc;/* arg 1: sigcontext */

	set_fs(USER_DS);

	#if DEBUG_SIG
	printk("SIG deliver (%s:%d): sp=%p pc=%08lx ra=%08lx\n",
	current->comm, current->pid, frame, regs->pc, );
	#endif

	return;

	give_sigsegv:
	force_sigsegv(sig, current);
	}

	static void setup_rt_frame(int sig, struct k_sigaction ka, siginfo_t info,
	sigset_t set, struct pt_regs regs)
	{
	struct rt_sigframe *frame;
	int err = 0;
	int signal;

	frame = get_sigframe(ka, regs, 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->gpr[GPR_SP]),
	&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->gpr[GPR_LP] = (unsigned long) ka->sa.sa_restorer;
	} else {
	/* Note, these encodings are _little endian_! */

	/* addi __NR_sigreturn, r0, r12 */
	err \|= __put_user(0x6600 \| (__NR_sigreturn << 16),
	frame->tramp + 0);
	/* trap 0 */
	err \|= __put_user(0x010007e0,
	frame->tramp + 1);

	regs->gpr[GPR_LP] = (unsigned long)frame->tramp;

	flush_cache_sigtramp (regs->gpr[GPR_LP]);
	}

	if (err)
	goto give_sigsegv;

	/* Set up registers for signal handler. */
	regs->pc = (v850_reg_t) ka->sa.sa_handler;
	regs->gpr[GPR_SP] = (v850_reg_t)frame;
	/* Signal handler args: */
	regs->gpr[GPR_ARG0] = signal; /* arg 0: signum */
	regs->gpr[GPR_ARG1] = (v850_reg_t)&frame->info; /* arg 1: siginfo */
	regs->gpr[GPR_ARG2] = (v850_reg_t)&frame->uc; /* arg 2: ucontext */

	set_fs(USER_DS);

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

	return;

	give_sigsegv:
	force_sigsegv(sig, current);
	}

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

	static void
	handle_signal(unsigned long sig, siginfo_t info, struct k_sigaction ka,
	sigset_t oldset, struct pt_regs regs)
	{
	/* Are we from a system call? */
	if (PT_REGS_SYSCALL (regs)) {
	/* If so, check system call restarting.. */
	switch (regs->gpr[GPR_RVAL]) {
	case -ERESTART_RESTARTBLOCK:
	current_thread_info()->restart_block.fn =
	do_no_restart_syscall;
	/* fall through */
	case -ERESTARTNOHAND:
	regs->gpr[GPR_RVAL] = -EINTR;
	break;

	case -ERESTARTSYS:
	if (!(ka->sa.sa_flags & SA_RESTART)) {
	regs->gpr[GPR_RVAL] = -EINTR;
	break;
	}
	/* fallthrough */
	case -ERESTARTNOINTR:
	regs->gpr[12] = PT_REGS_SYSCALL (regs);
	regs->pc -= 4; /* Size of `trap 0' insn. */
	}

	PT_REGS_SET_SYSCALL (regs, 0);
	}

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

	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);
	}

	/*
	* 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.
	*/
	int do_signal(struct pt_regs regs, sigset_t oldset)
	{
	siginfo_t info;
	int signr;
	struct k_sigaction ka;

	/*
	* 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 1;

	if (!oldset)
	oldset = &current->blocked;

	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
	if (signr > 0) {
	/* Whee! Actually deliver the signal. */
	handle_signal(signr, &info, &ka, oldset, regs);
	return 1;
	}

	/* Did we come from a system call? */
	if (PT_REGS_SYSCALL (regs)) {
	int rval = (int)regs->gpr[GPR_RVAL];
	/* Restart the system call - no handlers present */
	if (rval == -ERESTARTNOHAND
	\|\| rval == -ERESTARTSYS
	\|\| rval == -ERESTARTNOINTR)
	{
	regs->gpr[12] = PT_REGS_SYSCALL (regs);
	regs->pc -= 4; /* Size of `trap 0' insn. */
	}
	else if (rval == -ERESTART_RESTARTBLOCK) {
	regs->gpr[12] = __NR_restart_syscall;
	regs->pc -= 4; /* Size of `trap 0' insn. */
	}
	}
	return 0;
	}