/*
   * 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.
   *
   * Copyright (C) 1991, 1992  Linus Torvalds

   * Copyright (C) 1994 - 2000, 2006  Ralf Baechle

   * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
   */

  #include <linux/cache.h>

  #include <linux/compat.h>

  #include <linux/sched.h>
  #include <linux/mm.h>
  #include <linux/smp.h>

  #include <linux/kernel.h>
  #include <linux/signal.h>
  #include <linux/syscalls.h>
  #include <linux/errno.h>
  #include <linux/wait.h>
  #include <linux/ptrace.h>

  #include <linux/suspend.h>
  #include <linux/compiler.h>

  #include <linux/uaccess.h>

  #include <asm/abi.h>

  #include <asm/asm.h>

  #include <asm/compat-signal.h>

  #include <linux/bitops.h>
  #include <asm/cacheflush.h>
  #include <asm/sim.h>

  #include <asm/ucontext.h>
  #include <asm/system.h>
  #include <asm/fpu.h>

  #include <asm/war.h>

  #include <asm/vdso.h>

  #include "signal-common.h"

  static int (*save_fp_context32)(struct sigcontext32 __user *sc);
  static int (*restore_fp_context32)(struct sigcontext32 __user *sc);
  
  extern asmlinkage int _save_fp_context32(struct sigcontext32 __user *sc);
  extern asmlinkage int _restore_fp_context32(struct sigcontext32 __user *sc);
  
  extern asmlinkage int fpu_emulator_save_context32(struct sigcontext32 __user *sc);
  extern asmlinkage int fpu_emulator_restore_context32(struct sigcontext32 __user *sc);

  /*
   * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
   */

  #define __NR_O32_restart_syscall        4253

  /* 32-bit compatibility types */

  typedef unsigned int __sighandler32_t;
  typedef void (*vfptr_t)(void);
  
  struct sigaction32 {
  	unsigned int		sa_flags;
  	__sighandler32_t	sa_handler;
  	compat_sigset_t		sa_mask;
  };
  
  /* IRIX compatible stack_t  */
  typedef struct sigaltstack32 {
  	s32 ss_sp;
  	compat_size_t ss_size;
  	int ss_flags;
  } stack32_t;
  
  struct ucontext32 {
  	u32                 uc_flags;
  	s32                 uc_link;
  	stack32_t           uc_stack;
  	struct sigcontext32 uc_mcontext;

  	compat_sigset_t     uc_sigmask;   /* mask last for extensibility */

  };

  struct sigframe32 {
  	u32 sf_ass[4];		/* argument save space for o32 */

  	u32 sf_pad[2];		/* Was: signal trampoline */

  	struct sigcontext32 sf_sc;

  	compat_sigset_t sf_mask;

  };

  struct rt_sigframe32 {
  	u32 rs_ass[4];			/* argument save space for o32 */

  	u32 rs_pad[2];			/* Was: signal trampoline */

  	compat_siginfo_t rs_info;
  	struct ucontext32 rs_uc;
  };

  /*
   * sigcontext handlers
   */

  static int protected_save_fp_context32(struct sigcontext32 __user *sc)
  {
  	int err;
  	while (1) {
  		lock_fpu_owner();
  		own_fpu_inatomic(1);
  		err = save_fp_context32(sc); /* this might fail */
  		unlock_fpu_owner();
  		if (likely(!err))
  			break;
  		/* touch the sigcontext and try again */
  		err = __put_user(0, &sc->sc_fpregs[0]) |
  			__put_user(0, &sc->sc_fpregs[31]) |
  			__put_user(0, &sc->sc_fpc_csr);
  		if (err)
  			break;	/* really bad sigcontext */
  	}
  	return err;
  }
  
  static int protected_restore_fp_context32(struct sigcontext32 __user *sc)
  {

  	int err, tmp __maybe_unused;

  	while (1) {
  		lock_fpu_owner();
  		own_fpu_inatomic(0);
  		err = restore_fp_context32(sc); /* this might fail */
  		unlock_fpu_owner();
  		if (likely(!err))
  			break;
  		/* touch the sigcontext and try again */
  		err = __get_user(tmp, &sc->sc_fpregs[0]) |
  			__get_user(tmp, &sc->sc_fpregs[31]) |
  			__get_user(tmp, &sc->sc_fpc_csr);
  		if (err)
  			break;	/* really bad sigcontext */
  	}
  	return err;
  }

  static int setup_sigcontext32(struct pt_regs *regs,
  			      struct sigcontext32 __user *sc)
  {
  	int err = 0;
  	int i;

  	u32 used_math;

  
  	err |= __put_user(regs->cp0_epc, &sc->sc_pc);

  
  	err |= __put_user(0, &sc->sc_regs[0]);
  	for (i = 1; i < 32; i++)
  		err |= __put_user(regs->regs[i], &sc->sc_regs[i]);
  
  	err |= __put_user(regs->hi, &sc->sc_mdhi);
  	err |= __put_user(regs->lo, &sc->sc_mdlo);
  	if (cpu_has_dsp) {
  		err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
  		err |= __put_user(mfhi1(), &sc->sc_hi1);
  		err |= __put_user(mflo1(), &sc->sc_lo1);
  		err |= __put_user(mfhi2(), &sc->sc_hi2);
  		err |= __put_user(mflo2(), &sc->sc_lo2);
  		err |= __put_user(mfhi3(), &sc->sc_hi3);
  		err |= __put_user(mflo3(), &sc->sc_lo3);
  	}

  	used_math = !!used_math();
  	err |= __put_user(used_math, &sc->sc_used_math);

  	if (used_math) {

  		/*
  		 * Save FPU state to signal context.  Signal handler
  		 * will "inherit" current FPU state.
  		 */

  		err |= protected_save_fp_context32(sc);

  	}
  	return err;
  }

  static int
  check_and_restore_fp_context32(struct sigcontext32 __user *sc)
  {
  	int err, sig;
  
  	err = sig = fpcsr_pending(&sc->sc_fpc_csr);
  	if (err > 0)
  		err = 0;

  	err |= protected_restore_fp_context32(sc);

  	return err ?: sig;
  }

  static int restore_sigcontext32(struct pt_regs *regs,
  				struct sigcontext32 __user *sc)
  {
  	u32 used_math;
  	int err = 0;
  	s32 treg;
  	int i;
  
  	/* Always make any pending restarted system calls return -EINTR */
  	current_thread_info()->restart_block.fn = do_no_restart_syscall;
  
  	err |= __get_user(regs->cp0_epc, &sc->sc_pc);
  	err |= __get_user(regs->hi, &sc->sc_mdhi);
  	err |= __get_user(regs->lo, &sc->sc_mdlo);
  	if (cpu_has_dsp) {
  		err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
  		err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
  		err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
  		err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
  		err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
  		err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
  		err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
  	}
  
  	for (i = 1; i < 32; i++)
  		err |= __get_user(regs->regs[i], &sc->sc_regs[i]);
  
  	err |= __get_user(used_math, &sc->sc_used_math);
  	conditional_used_math(used_math);

  	if (used_math) {

  		/* restore fpu context if we have used it before */

  		if (!err)
  			err = check_and_restore_fp_context32(sc);

  	} else {
  		/* signal handler may have used FPU.  Give it up. */

  		lose_fpu(0);

  	}

  	return err;
  }
  
  /*
   *
   */

  extern void __put_sigset_unknown_nsig(void);
  extern void __get_sigset_unknown_nsig(void);

  static inline int put_sigset(const sigset_t *kbuf, compat_sigset_t __user *ubuf)

  {
  	int err = 0;
  
  	if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)))
  		return -EFAULT;
  
  	switch (_NSIG_WORDS) {
  	default:
  		__put_sigset_unknown_nsig();
  	case 2:

  		err |= __put_user(kbuf->sig[1] >> 32, &ubuf->sig[3]);
  		err |= __put_user(kbuf->sig[1] & 0xffffffff, &ubuf->sig[2]);

  	case 1:

  		err |= __put_user(kbuf->sig[0] >> 32, &ubuf->sig[1]);
  		err |= __put_user(kbuf->sig[0] & 0xffffffff, &ubuf->sig[0]);

  	}
  
  	return err;
  }

  static inline int get_sigset(sigset_t *kbuf, const compat_sigset_t __user *ubuf)

  {
  	int err = 0;
  	unsigned long sig[4];
  
  	if (!access_ok(VERIFY_READ, ubuf, sizeof(*ubuf)))
  		return -EFAULT;
  
  	switch (_NSIG_WORDS) {
  	default:
  		__get_sigset_unknown_nsig();
  	case 2:

  		err |= __get_user(sig[3], &ubuf->sig[3]);
  		err |= __get_user(sig[2], &ubuf->sig[2]);

  		kbuf->sig[1] = sig[2] | (sig[3] << 32);
  	case 1:

  		err |= __get_user(sig[1], &ubuf->sig[1]);
  		err |= __get_user(sig[0], &ubuf->sig[0]);

  		kbuf->sig[0] = sig[0] | (sig[1] << 32);
  	}
  
  	return err;
  }
  
  /*
   * Atomically swap in the new signal mask, and wait for a signal.
   */

  asmlinkage int sys32_sigsuspend(nabi_no_regargs struct pt_regs regs)

  {

  	compat_sigset_t __user *uset;

  	sigset_t newset;

  	uset = (compat_sigset_t __user *) regs.regs[4];

  	if (get_sigset(&newset, uset))
  		return -EFAULT;
  	sigdelsetmask(&newset, ~_BLOCKABLE);
  
  	spin_lock_irq(&current->sighand->siglock);

  	current->saved_sigmask = current->blocked;

  	current->blocked = newset;
  	recalc_sigpending();
  	spin_unlock_irq(&current->sighand->siglock);

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

  }

  asmlinkage int sys32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)

  {

  	compat_sigset_t __user *uset;

  	sigset_t newset;

  	size_t sigsetsize;

  
  	/* XXX Don't preclude handling different sized sigset_t's.  */
  	sigsetsize = regs.regs[5];
  	if (sigsetsize != sizeof(compat_sigset_t))
  		return -EINVAL;

  	uset = (compat_sigset_t __user *) regs.regs[4];

  	if (get_sigset(&newset, uset))
  		return -EFAULT;
  	sigdelsetmask(&newset, ~_BLOCKABLE);
  
  	spin_lock_irq(&current->sighand->siglock);

  	current->saved_sigmask = current->blocked;

  	current->blocked = newset;

  	recalc_sigpending();

  	spin_unlock_irq(&current->sighand->siglock);

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

  }

  SYSCALL_DEFINE3(32_sigaction, long, sig, const struct sigaction32 __user *, act,
  	struct sigaction32 __user *, oact)

  {
  	struct k_sigaction new_ka, old_ka;
  	int ret;
  	int err = 0;
  
  	if (act) {
  		old_sigset_t mask;

  		s32 handler;

  
  		if (!access_ok(VERIFY_READ, act, sizeof(*act)))
  			return -EFAULT;

  		err |= __get_user(handler, &act->sa_handler);

  		new_ka.sa.sa_handler = (void __user *)(s64)handler;

  		err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
  		err |= __get_user(mask, &act->sa_mask.sig[0]);
  		if (err)
  			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 (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))

  			return -EFAULT;

  		err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
  		err |= __put_user((u32)(u64)old_ka.sa.sa_handler,
  		                  &oact->sa_handler);
  		err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);

  		err |= __put_user(0, &oact->sa_mask.sig[1]);
  		err |= __put_user(0, &oact->sa_mask.sig[2]);
  		err |= __put_user(0, &oact->sa_mask.sig[3]);
  		if (err)

  			return -EFAULT;
  	}
  
  	return ret;
  }
  
  asmlinkage int sys32_sigaltstack(nabi_no_regargs struct pt_regs regs)
  {

  	const stack32_t __user *uss = (const stack32_t __user *) regs.regs[4];
  	stack32_t __user *uoss = (stack32_t __user *) regs.regs[5];

  	unsigned long usp = regs.regs[29];
  	stack_t kss, koss;
  	int ret, err = 0;
  	mm_segment_t old_fs = get_fs();
  	s32 sp;
  
  	if (uss) {
  		if (!access_ok(VERIFY_READ, uss, sizeof(*uss)))
  			return -EFAULT;
  		err |= __get_user(sp, &uss->ss_sp);

  		kss.ss_sp = (void __user *) (long) sp;

  		err |= __get_user(kss.ss_size, &uss->ss_size);
  		err |= __get_user(kss.ss_flags, &uss->ss_flags);
  		if (err)
  			return -EFAULT;
  	}

  	set_fs(KERNEL_DS);

  	ret = do_sigaltstack(uss ? (stack_t __user *)&kss : NULL,
  			     uoss ? (stack_t __user *)&koss : NULL, usp);

  	set_fs(old_fs);

  
  	if (!ret && uoss) {
  		if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss)))
  			return -EFAULT;

  		sp = (int) (unsigned long) koss.ss_sp;

  		err |= __put_user(sp, &uoss->ss_sp);
  		err |= __put_user(koss.ss_size, &uoss->ss_size);
  		err |= __put_user(koss.ss_flags, &uoss->ss_flags);
  		if (err)
  			return -EFAULT;
  	}
  	return ret;
  }

  int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)

  {
  	int err;
  
  	if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
  		return -EFAULT;
  
  	/* If you change siginfo_t structure, please be sure
  	   this code is fixed accordingly.
  	   It should never copy any pad contained in the structure
  	   to avoid security leaks, but must copy the generic
  	   3 ints plus the relevant union member.
  	   This routine must convert siginfo from 64bit to 32bit as well
  	   at the same time.  */
  	err = __put_user(from->si_signo, &to->si_signo);
  	err |= __put_user(from->si_errno, &to->si_errno);
  	err |= __put_user((short)from->si_code, &to->si_code);
  	if (from->si_code < 0)
  		err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
  	else {
  		switch (from->si_code >> 16) {

  		case __SI_TIMER >> 16:
  			err |= __put_user(from->si_tid, &to->si_tid);
  			err |= __put_user(from->si_overrun, &to->si_overrun);
  			err |= __put_user(from->si_int, &to->si_int);
  			break;

  		case __SI_CHLD >> 16:
  			err |= __put_user(from->si_utime, &to->si_utime);
  			err |= __put_user(from->si_stime, &to->si_stime);
  			err |= __put_user(from->si_status, &to->si_status);
  		default:
  			err |= __put_user(from->si_pid, &to->si_pid);
  			err |= __put_user(from->si_uid, &to->si_uid);
  			break;
  		case __SI_FAULT >> 16:

  			err |= __put_user((unsigned long)from->si_addr, &to->si_addr);

  			break;
  		case __SI_POLL >> 16:
  			err |= __put_user(from->si_band, &to->si_band);
  			err |= __put_user(from->si_fd, &to->si_fd);
  			break;
  		case __SI_RT >> 16: /* This is not generated by the kernel as of now.  */
  		case __SI_MESGQ >> 16:
  			err |= __put_user(from->si_pid, &to->si_pid);
  			err |= __put_user(from->si_uid, &to->si_uid);
  			err |= __put_user(from->si_int, &to->si_int);
  			break;
  		}
  	}
  	return err;
  }

  int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
  {
  	memset(to, 0, sizeof *to);
  
  	if (copy_from_user(to, from, 3*sizeof(int)) ||
  	    copy_from_user(to->_sifields._pad,
  			   from->_sifields._pad, SI_PAD_SIZE32))
  		return -EFAULT;
  
  	return 0;
  }

  asmlinkage void sys32_sigreturn(nabi_no_regargs struct pt_regs regs)

  {

  	struct sigframe32 __user *frame;

  	sigset_t blocked;

  	int sig;

  	frame = (struct sigframe32 __user *) regs.regs[29];

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

  	if (__copy_conv_sigset_from_user(&blocked, &frame->sf_mask))

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

  	sig = restore_sigcontext32(&regs, &frame->sf_sc);
  	if (sig < 0)

  		goto badframe;

  	else if (sig)
  		force_sig(sig, current);

  
  	/*
  	 * Don't let your children do this ...
  	 */

  	__asm__ __volatile__(
  		"move\t$29, %0
  \t"
  		"j\tsyscall_exit"
  		:/* no outputs */
  		:"r" (&regs));
  	/* Unreached */
  
  badframe:
  	force_sig(SIGSEGV, current);
  }

  asmlinkage void sys32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)

  {

  	struct rt_sigframe32 __user *frame;

  	mm_segment_t old_fs;

  	sigset_t set;
  	stack_t st;
  	s32 sp;

  	int sig;

  	frame = (struct rt_sigframe32 __user *) regs.regs[29];

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

  	if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))

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

  	sig = restore_sigcontext32(&regs, &frame->rs_uc.uc_mcontext);
  	if (sig < 0)

  		goto badframe;

  	else if (sig)
  		force_sig(sig, current);

  
  	/* The ucontext contains a stack32_t, so we must convert!  */
  	if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp))
  		goto badframe;

  	st.ss_sp = (void __user *)(long) sp;

  	if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size))
  		goto badframe;
  	if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags))
  		goto badframe;
  
  	/* It is more difficult to avoid calling this function than to
  	   call it and ignore errors.  */

  	old_fs = get_fs();

  	set_fs(KERNEL_DS);

  	do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]);

  	set_fs(old_fs);

  
  	/*
  	 * Don't let your children do this ...
  	 */
  	__asm__ __volatile__(
  		"move\t$29, %0
  \t"
  		"j\tsyscall_exit"
  		:/* no outputs */
  		:"r" (&regs));
  	/* Unreached */
  
  badframe:
  	force_sig(SIGSEGV, current);
  }

  static int setup_frame_32(void *sig_return, struct k_sigaction *ka,
  			  struct pt_regs *regs, int signr, sigset_t *set)

  {

  	struct sigframe32 __user *frame;

  	int err = 0;
  
  	frame = get_sigframe(ka, regs, sizeof(*frame));
  	if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
  		goto give_sigsegv;

  	err |= setup_sigcontext32(regs, &frame->sf_sc);

  	err |= __copy_conv_sigset_to_user(&frame->sf_mask, set);

  	if (err)
  		goto give_sigsegv;
  
  	/*
  	 * Arguments to signal handler:
  	 *
  	 *   a0 = signal number
  	 *   a1 = 0 (should be cause)
  	 *   a2 = pointer to struct sigcontext
  	 *
  	 * $25 and c0_epc point to the signal handler, $29 points to the
  	 * struct sigframe.
  	 */
  	regs->regs[ 4] = signr;
  	regs->regs[ 5] = 0;
  	regs->regs[ 6] = (unsigned long) &frame->sf_sc;
  	regs->regs[29] = (unsigned long) frame;

  	regs->regs[31] = (unsigned long) sig_return;

  	regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;

  	DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx
  ",

  	       current->comm, current->pid,

  	       frame, regs->cp0_epc, regs->regs[31]);

  	return 0;

  
  give_sigsegv:
  	force_sigsegv(signr, current);

  	return -EFAULT;

  }

  static int setup_rt_frame_32(void *sig_return, struct k_sigaction *ka,
  			     struct pt_regs *regs, int signr, sigset_t *set,
  			     siginfo_t *info)

  {

  	struct rt_sigframe32 __user *frame;

  	int err = 0;
  	s32 sp;
  
  	frame = get_sigframe(ka, regs, sizeof(*frame));
  	if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
  		goto give_sigsegv;

  	/* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */
  	err |= copy_siginfo_to_user32(&frame->rs_info, info);
  
  	/* Create the ucontext.  */
  	err |= __put_user(0, &frame->rs_uc.uc_flags);
  	err |= __put_user(0, &frame->rs_uc.uc_link);
  	sp = (int) (long) current->sas_ss_sp;
  	err |= __put_user(sp,
  	                  &frame->rs_uc.uc_stack.ss_sp);
  	err |= __put_user(sas_ss_flags(regs->regs[29]),
  	                  &frame->rs_uc.uc_stack.ss_flags);
  	err |= __put_user(current->sas_ss_size,
  	                  &frame->rs_uc.uc_stack.ss_size);
  	err |= setup_sigcontext32(regs, &frame->rs_uc.uc_mcontext);

  	err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);

  
  	if (err)
  		goto give_sigsegv;
  
  	/*
  	 * Arguments to signal handler:
  	 *
  	 *   a0 = signal number
  	 *   a1 = 0 (should be cause)
  	 *   a2 = pointer to ucontext
  	 *
  	 * $25 and c0_epc point to the signal handler, $29 points to
  	 * the struct rt_sigframe32.
  	 */
  	regs->regs[ 4] = signr;
  	regs->regs[ 5] = (unsigned long) &frame->rs_info;
  	regs->regs[ 6] = (unsigned long) &frame->rs_uc;
  	regs->regs[29] = (unsigned long) frame;

  	regs->regs[31] = (unsigned long) sig_return;

  	regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;

  	DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx
  ",

  	       current->comm, current->pid,

  	       frame, regs->cp0_epc, regs->regs[31]);

  	return 0;

  
  give_sigsegv:
  	force_sigsegv(signr, current);

  	return -EFAULT;

  }

  /*
   * o32 compatibility on 64-bit kernels, without DSP ASE
   */
  struct mips_abi mips_abi_32 = {
  	.setup_frame	= setup_frame_32,

  	.signal_return_offset =
  		offsetof(struct mips_vdso, o32_signal_trampoline),

  	.setup_rt_frame	= setup_rt_frame_32,

  	.rt_signal_return_offset =
  		offsetof(struct mips_vdso, o32_rt_signal_trampoline),

  	.restart	= __NR_O32_restart_syscall
  };

  SYSCALL_DEFINE4(32_rt_sigaction, int, sig,
  	const struct sigaction32 __user *, act,
  	struct sigaction32 __user *, oact, unsigned int, sigsetsize)

  {
  	struct k_sigaction new_sa, old_sa;
  	int ret = -EINVAL;
  
  	/* XXX: Don't preclude handling different sized sigset_t's.  */
  	if (sigsetsize != sizeof(sigset_t))
  		goto out;
  
  	if (act) {

  		s32 handler;

  		int err = 0;
  
  		if (!access_ok(VERIFY_READ, act, sizeof(*act)))
  			return -EFAULT;

  		err |= __get_user(handler, &act->sa_handler);

  		new_sa.sa.sa_handler = (void __user *)(s64)handler;

  		err |= __get_user(new_sa.sa.sa_flags, &act->sa_flags);
  		err |= get_sigset(&new_sa.sa.sa_mask, &act->sa_mask);
  		if (err)
  			return -EFAULT;
  	}
  
  	ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa : NULL);
  
  	if (!ret && oact) {
  		int err = 0;
  
  		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
  			return -EFAULT;
  
  		err |= __put_user((u32)(u64)old_sa.sa.sa_handler,
  		                   &oact->sa_handler);
  		err |= __put_user(old_sa.sa.sa_flags, &oact->sa_flags);
  		err |= put_sigset(&old_sa.sa.sa_mask, &oact->sa_mask);
  		if (err)
  			return -EFAULT;
  	}
  out:
  	return ret;
  }

  SYSCALL_DEFINE4(32_rt_sigprocmask, int, how, compat_sigset_t __user *, set,
  	compat_sigset_t __user *, oset, unsigned int, sigsetsize)

  {
  	sigset_t old_set, new_set;
  	int ret;
  	mm_segment_t old_fs = get_fs();
  
  	if (set && get_sigset(&new_set, set))
  		return -EFAULT;

  	set_fs(KERNEL_DS);

  	ret = sys_rt_sigprocmask(how, set ? (sigset_t __user *)&new_set : NULL,
  				 oset ? (sigset_t __user *)&old_set : NULL,
  				 sigsetsize);

  	set_fs(old_fs);

  
  	if (!ret && oset && put_sigset(&old_set, oset))
  		return -EFAULT;
  
  	return ret;
  }

  SYSCALL_DEFINE2(32_rt_sigpending, compat_sigset_t __user *, uset,
  	unsigned int, sigsetsize)

  {
  	int ret;
  	sigset_t set;
  	mm_segment_t old_fs = get_fs();

  	set_fs(KERNEL_DS);

  	ret = sys_rt_sigpending((sigset_t __user *)&set, sigsetsize);

  	set_fs(old_fs);

  
  	if (!ret && put_sigset(&set, uset))
  		return -EFAULT;
  
  	return ret;
  }

  SYSCALL_DEFINE3(32_rt_sigqueueinfo, int, pid, int, sig,
  	compat_siginfo_t __user *, uinfo)

  {
  	siginfo_t info;
  	int ret;
  	mm_segment_t old_fs = get_fs();

  	if (copy_from_user(&info, uinfo, 3*sizeof(int)) ||
  	    copy_from_user(info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE))

  		return -EFAULT;

  	set_fs(KERNEL_DS);

  	ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *)&info);

  	set_fs(old_fs);

  	return ret;
  }

  SYSCALL_DEFINE5(32_waitid, int, which, compat_pid_t, pid,
  	     compat_siginfo_t __user *, uinfo, int, options,
  	     struct compat_rusage __user *, uru)

  {
  	siginfo_t info;
  	struct rusage ru;
  	long ret;
  	mm_segment_t old_fs = get_fs();
  
  	info.si_signo = 0;

  	set_fs(KERNEL_DS);

  	ret = sys_waitid(which, pid, (siginfo_t __user *) &info, options,
  			 uru ? (struct rusage __user *) &ru : NULL);

  	set_fs(old_fs);

  
  	if (ret < 0 || info.si_signo == 0)
  		return ret;
  
  	if (uru && (ret = put_compat_rusage(&ru, uru)))
  		return ret;
  
  	BUG_ON(info.si_code & __SI_MASK);
  	info.si_code |= __SI_CHLD;
  	return copy_siginfo_to_user32(uinfo, &info);
  }

  
  static int signal32_init(void)
  {
  	if (cpu_has_fpu) {
  		save_fp_context32 = _save_fp_context32;
  		restore_fp_context32 = _restore_fp_context32;
  	} else {
  		save_fp_context32 = fpu_emulator_save_context32;
  		restore_fp_context32 = fpu_emulator_restore_context32;
  	}
  
  	return 0;
  }
  
  arch_initcall(signal32_init);