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

  #include <linux/cache.h>

  #include <linux/irqflags.h>

  #include <linux/sched.h>
  #include <linux/mm.h>
  #include <linux/personality.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/compiler.h>

  #include <linux/syscalls.h>

  #include <linux/uaccess.h>

  #include <linux/tracehook.h>

  #include <asm/abi.h>

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

  #include <asm/ucontext.h>
  #include <asm/cpu-features.h>

  #include <asm/war.h>

  #include <asm/vdso.h>

  
  #include "signal-common.h"

  static int (*save_fp_context)(struct sigcontext __user *sc);
  static int (*restore_fp_context)(struct sigcontext __user *sc);
  
  extern asmlinkage int _save_fp_context(struct sigcontext __user *sc);
  extern asmlinkage int _restore_fp_context(struct sigcontext __user *sc);
  
  extern asmlinkage int fpu_emulator_save_context(struct sigcontext __user *sc);
  extern asmlinkage int fpu_emulator_restore_context(struct sigcontext __user *sc);

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

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

  	struct sigcontext sf_sc;
  	sigset_t sf_mask;
  };

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

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

  	struct siginfo rs_info;
  	struct ucontext rs_uc;
  };

  /*

   * Helper routines
   */

  static int protected_save_fp_context(struct sigcontext __user *sc)
  {
  	int err;
  	while (1) {
  		lock_fpu_owner();
  		own_fpu_inatomic(1);
  		err = save_fp_context(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_context(struct sigcontext __user *sc)
  {

  	int err, tmp __maybe_unused;

  	while (1) {
  		lock_fpu_owner();
  		own_fpu_inatomic(0);
  		err = restore_fp_context(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;
  }

  int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
  {
  	int err = 0;
  	int i;

  	unsigned int 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]);

  #ifdef CONFIG_CPU_HAS_SMARTMIPS
  	err |= __put_user(regs->acx, &sc->sc_acx);
  #endif

  	err |= __put_user(regs->hi, &sc->sc_mdhi);
  	err |= __put_user(regs->lo, &sc->sc_mdlo);
  	if (cpu_has_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);
  		err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
  	}

  	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_context(sc);

  	}
  	return err;
  }

  int fpcsr_pending(unsigned int __user *fpcsr)
  {
  	int err, sig = 0;
  	unsigned int csr, enabled;
  
  	err = __get_user(csr, fpcsr);
  	enabled = FPU_CSR_UNI_X | ((csr & FPU_CSR_ALL_E) << 5);
  	/*
  	 * If the signal handler set some FPU exceptions, clear it and
  	 * send SIGFPE.
  	 */
  	if (csr & enabled) {
  		csr &= ~enabled;
  		err |= __put_user(csr, fpcsr);
  		sig = SIGFPE;
  	}
  	return err ?: sig;
  }
  
  static int
  check_and_restore_fp_context(struct sigcontext __user *sc)
  {
  	int err, sig;
  
  	err = sig = fpcsr_pending(&sc->sc_fpc_csr);
  	if (err > 0)
  		err = 0;

  	err |= protected_restore_fp_context(sc);

  	return err ?: sig;
  }

  int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
  {
  	unsigned int used_math;
  	unsigned long treg;
  	int err = 0;
  	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);

  
  #ifdef CONFIG_CPU_HAS_SMARTMIPS
  	err |= __get_user(regs->acx, &sc->sc_acx);
  #endif

  	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_context(sc);

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

  		lose_fpu(0);

  	}

  	return err;
  }
  
  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->regs[29];
  
  	/*
  	 * FPU emulator may have it's own trampoline active just
  	 * above the user stack, 16-bytes before the next lowest
  	 * 16 byte boundary.  Try to avoid trashing it.
  	 */
  	sp -= 32;
  
  	/* This is the X/Open sanctioned signal stack switching.  */
  	if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0))
  		sp = current->sas_ss_sp + current->sas_ss_size;
  
  	return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK));
  }

  /*

   * Atomically swap in the new signal mask, and wait for a signal.
   */
  
  #ifdef CONFIG_TRAD_SIGNALS

  asmlinkage int sys_sigsuspend(nabi_no_regargs struct pt_regs regs)

  {

  	sigset_t newset;

  	sigset_t __user *uset;

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

  	if (copy_from_user(&newset, uset, sizeof(sigset_t)))
  		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;

  }
  #endif

  asmlinkage int sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)

  {

  	sigset_t newset;

  	sigset_t __user *unewset;

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

  	unewset = (sigset_t __user *) regs.regs[4];

  	if (copy_from_user(&newset, unewset, sizeof(newset)))
  		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;

  }
  
  #ifdef CONFIG_TRAD_SIGNALS

  SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act,
  	struct sigaction __user *, oact)

  {
  	struct k_sigaction new_ka, old_ka;
  	int ret;
  	int err = 0;
  
  	if (act) {
  		old_sigset_t mask;
  
  		if (!access_ok(VERIFY_READ, act, sizeof(*act)))
  			return -EFAULT;
  		err |= __get_user(new_ka.sa.sa_handler, &act->sa_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(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;
  }
  #endif
  
  asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs)
  {

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

  	unsigned long usp = regs.regs[29];
  
  	return do_sigaltstack(uss, uoss, usp);
  }

  #ifdef CONFIG_TRAD_SIGNALS

  asmlinkage void sys_sigreturn(nabi_no_regargs struct pt_regs regs)

  {

  	struct sigframe __user *frame;

  	sigset_t blocked;

  	int sig;

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

  	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
  		goto badframe;
  	if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked)))
  		goto badframe;
  
  	sigdelsetmask(&blocked, ~_BLOCKABLE);
  	spin_lock_irq(&current->sighand->siglock);
  	current->blocked = blocked;
  	recalc_sigpending();
  	spin_unlock_irq(&current->sighand->siglock);

  	sig = restore_sigcontext(&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);
  }

  #endif /* CONFIG_TRAD_SIGNALS */

  asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs)

  {

  	struct rt_sigframe __user *frame;

  	sigset_t set;

  	int sig;

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

  	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
  		goto badframe;
  	if (__copy_from_user(&set, &frame->rs_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);

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

  		goto badframe;

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

  	/* It is more difficult to avoid calling this function than to
  	   call it and ignore errors.  */

  	do_sigaltstack(&frame->rs_uc.uc_stack, NULL, regs.regs[29]);

  
  	/*
  	 * 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);
  }
  
  #ifdef CONFIG_TRAD_SIGNALS

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

  {

  	struct sigframe __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_sigcontext(regs, &frame->sf_sc);
  	err |= __copy_to_user(&frame->sf_mask, set, sizeof(*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;

  }
  #endif

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

  {

  	struct rt_sigframe __user *frame;

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

  	/* Create siginfo.  */
  	err |= copy_siginfo_to_user(&frame->rs_info, info);
  
  	/* Create the ucontext.  */
  	err |= __put_user(0, &frame->rs_uc.uc_flags);

  	err |= __put_user(NULL, &frame->rs_uc.uc_link);

  	err |= __put_user((void __user *)current->sas_ss_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_sigcontext(regs, &frame->rs_uc.uc_mcontext);
  	err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*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_sigframe.
  	 */
  	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;

  }

  struct mips_abi mips_abi = {
  #ifdef CONFIG_TRAD_SIGNALS
  	.setup_frame	= setup_frame,

  	.signal_return_offset = offsetof(struct mips_vdso, signal_trampoline),

  #endif
  	.setup_rt_frame	= setup_rt_frame,

  	.rt_signal_return_offset =
  		offsetof(struct mips_vdso, rt_signal_trampoline),

  	.restart	= __NR_restart_syscall
  };

  static int handle_signal(unsigned long sig, siginfo_t *info,

  	struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs)
  {

  	int ret;

  	struct mips_abi *abi = current->thread.abi;
  	void *vdso = current->mm->context.vdso;

  	if (regs->regs[0]) {
  		switch(regs->regs[2]) {
  		case ERESTART_RESTARTBLOCK:
  		case ERESTARTNOHAND:

  			regs->regs[2] = EINTR;
  			break;

  		case ERESTARTSYS:
  			if (!(ka->sa.sa_flags & SA_RESTART)) {
  				regs->regs[2] = EINTR;
  				break;
  			}
  		/* fallthrough */
  		case ERESTARTNOINTR:
  			regs->regs[7] = regs->regs[26];
  			regs->regs[2] = regs->regs[0];
  			regs->cp0_epc -= 4;

  		}

  		regs->regs[0] = 0;		/* Don't deal with this again.  */
  	}

  	if (sig_uses_siginfo(ka))

  		ret = abi->setup_rt_frame(vdso + abi->rt_signal_return_offset,
  					  ka, regs, sig, oldset, info);

  	else

  		ret = abi->setup_frame(vdso + abi->signal_return_offset,
  				       ka, regs, sig, oldset);

  	if (ret)
  		return ret;

  	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;

  }

  static void do_signal(struct pt_regs *regs)

  {
  	struct k_sigaction ka;

  	sigset_t *oldset;

  	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. Just return without doing anything
  	 * if so.
  	 */
  	if (!user_mode(regs))

  		return;

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

  		oldset = &current->blocked;
  
  	signr = get_signal_to_deliver(&info, &ka, regs, NULL);

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

  
  		return;

  	}

  	if (regs->regs[0]) {
  		if (regs->regs[2] == ERESTARTNOHAND ||
  		    regs->regs[2] == ERESTARTSYS ||
  		    regs->regs[2] == ERESTARTNOINTR) {

  			regs->regs[2] = regs->regs[0];

  			regs->regs[7] = regs->regs[26];

  			regs->cp0_epc -= 4;

  		}
  		if (regs->regs[2] == ERESTART_RESTARTBLOCK) {

  			regs->regs[2] = current->thread.abi->restart;

  			regs->regs[7] = regs->regs[26];
  			regs->cp0_epc -= 4;
  		}

  		regs->regs[0] = 0;	/* Don't deal with this again.  */

  	}

  
  	/*
  	 * If there's no signal to deliver, we just put the saved sigmask
  	 * back
  	 */
  	if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
  		clear_thread_flag(TIF_RESTORE_SIGMASK);
  		sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
  	}

  }
  
  /*
   * notification of userspace execution resumption

   * - triggered by the TIF_WORK_MASK flags

   */

  asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused,

  	__u32 thread_info_flags)
  {

  	local_irq_enable();

  	/* 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(regs);

  		if (current->replacement_session_keyring)
  			key_replace_session_keyring();

  	}

  }

  
  #ifdef CONFIG_SMP
  static int smp_save_fp_context(struct sigcontext __user *sc)
  {
  	return raw_cpu_has_fpu
  	       ? _save_fp_context(sc)
  	       : fpu_emulator_save_context(sc);
  }
  
  static int smp_restore_fp_context(struct sigcontext __user *sc)
  {
  	return raw_cpu_has_fpu
  	       ? _restore_fp_context(sc)
  	       : fpu_emulator_restore_context(sc);
  }
  #endif
  
  static int signal_setup(void)
  {
  #ifdef CONFIG_SMP
  	/* For now just do the cpu_has_fpu check when the functions are invoked */
  	save_fp_context = smp_save_fp_context;
  	restore_fp_context = smp_restore_fp_context;
  #else
  	if (cpu_has_fpu) {
  		save_fp_context = _save_fp_context;
  		restore_fp_context = _restore_fp_context;
  	} else {
  		save_fp_context = fpu_emulator_save_context;
  		restore_fp_context = fpu_emulator_restore_context;
  	}
  #endif
  
  	return 0;
  }
  
  arch_initcall(signal_setup);