i386: prepare shared kernel/signal.c

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 667 deletions

diff --git a/arch/i386/kernel/signal.c b/arch/i386/kernel/signal.c
deleted file mode 100644
index f5dd85656c18..000000000000
--- a/arch/i386/kernel/signal.c
+++ /dev/null
@@ -1,667 +0,0 @@
-/*
- *  linux/arch/i386/kernel/signal.c
- *
- *  Copyright (C) 1991, 1992  Linus Torvalds
- *
- *  1997-11-28  Modified for POSIX.1b signals by Richard Henderson
- *  2000-06-20  Pentium III FXSR, SSE support by Gareth Hughes
- */
-
-#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/unistd.h>
-#include <linux/stddef.h>
-#include <linux/personality.h>
-#include <linux/suspend.h>
-#include <linux/ptrace.h>
-#include <linux/elf.h>
-#include <linux/binfmts.h>
-#include <asm/processor.h>
-#include <asm/ucontext.h>
-#include <asm/uaccess.h>
-#include <asm/i387.h>
-#include "sigframe.h"
-
-#define DEBUG_SIG 0
-
-#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
-
-/*
- * Atomically swap in the new signal mask, and wait for a signal.
- */
-asmlinkage int
-sys_sigsuspend(int history0, int history1, old_sigset_t mask)
-{
-	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(unsigned long ebx)
-{
-	/* This is needed to make gcc realize it doesn't own the "struct pt_regs" */
-	struct pt_regs *regs = (struct pt_regs *)&ebx;
-	const stack_t __user *uss = (const stack_t __user *)ebx;
-	stack_t __user *uoss = (stack_t __user *)regs->ecx;
-
-	return do_sigaltstack(uss, uoss, regs->esp);
-}
-
-
-/*
- * Do a signal return; undo the signal stack.
- */
-
-static int
-restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *peax)
-{
-	unsigned int err = 0;
-
-	/* Always make any pending restarted system calls return -EINTR */
-	current_thread_info()->restart_block.fn = do_no_restart_syscall;
-
-#define COPY(x)		err |= __get_user(regs->x, &sc->x)
-
-#define COPY_SEG(seg)							\
-	{ unsigned short tmp;						\
-	  err |= __get_user(tmp, &sc->seg);				\
-	  regs->x##seg = tmp; }
-
-#define COPY_SEG_STRICT(seg)						\
-	{ unsigned short tmp;						\
-	  err |= __get_user(tmp, &sc->seg);				\
-	  regs->x##seg = tmp|3; }
-
-#define GET_SEG(seg)							\
-	{ unsigned short tmp;						\
-	  err |= __get_user(tmp, &sc->seg);				\
-	  loadsegment(seg,tmp); }
-
-#define	FIX_EFLAGS	(X86_EFLAGS_AC | X86_EFLAGS_RF |		 \
-			 X86_EFLAGS_OF | X86_EFLAGS_DF |		 \
-			 X86_EFLAGS_TF | X86_EFLAGS_SF | X86_EFLAGS_ZF | \
-			 X86_EFLAGS_AF | X86_EFLAGS_PF | X86_EFLAGS_CF)
-
-	GET_SEG(gs);
-	COPY_SEG(fs);
-	COPY_SEG(es);
-	COPY_SEG(ds);
-	COPY(edi);
-	COPY(esi);
-	COPY(ebp);
-	COPY(esp);
-	COPY(ebx);
-	COPY(edx);
-	COPY(ecx);
-	COPY(eip);
-	COPY_SEG_STRICT(cs);
-	COPY_SEG_STRICT(ss);
-	
-	{
-		unsigned int tmpflags;
-		err |= __get_user(tmpflags, &sc->eflags);
-		regs->eflags = (regs->eflags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
-		regs->orig_eax = -1;		/* disable syscall checks */
-	}
-
-	{
-		struct _fpstate __user * buf;
-		err |= __get_user(buf, &sc->fpstate);
-		if (buf) {
-			if (!access_ok(VERIFY_READ, buf, sizeof(*buf)))
-				goto badframe;
-			err |= restore_i387(buf);
-		} else {
-			struct task_struct *me = current;
-			if (used_math()) {
-				clear_fpu(me);
-				clear_used_math();
-			}
-		}
-	}
-
-	err |= __get_user(*peax, &sc->eax);
-	return err;
-
-badframe:
-	return 1;
-}
-
-asmlinkage int sys_sigreturn(unsigned long __unused)
-{
-	struct pt_regs *regs = (struct pt_regs *) &__unused;
-	struct sigframe __user *frame = (struct sigframe __user *)(regs->esp - 8);
-	sigset_t set;
-	int eax;
-
-	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, &eax))
-		goto badframe;
-	return eax;
-
-badframe:
-	if (show_unhandled_signals && printk_ratelimit())
-		printk("%s%s[%d] bad frame in sigreturn frame:%p eip:%lx"
-		       " esp:%lx oeax:%lx\n",
-		    current->pid > 1 ? KERN_INFO : KERN_EMERG,
-		    current->comm, current->pid, frame, regs->eip,
-		    regs->esp, regs->orig_eax);
-
-	force_sig(SIGSEGV, current);
-	return 0;
-}	
-
-asmlinkage int sys_rt_sigreturn(unsigned long __unused)
-{
-	struct pt_regs *regs = (struct pt_regs *) &__unused;
-	struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(regs->esp - 4);
-	sigset_t set;
-	int eax;
-
-	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, &eax))
-		goto badframe;
-
-	if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->esp) == -EFAULT)
-		goto badframe;
-
-	return eax;
-
-badframe:
-	force_sig(SIGSEGV, current);
-	return 0;
-}	
-
-/*
- * Set up a signal frame.
- */
-
-static int
-setup_sigcontext(struct sigcontext __user *sc, struct _fpstate __user *fpstate,
-		 struct pt_regs *regs, unsigned long mask)
-{
-	int tmp, err = 0;
-
-	err |= __put_user(regs->xfs, (unsigned int __user *)&sc->fs);
-	savesegment(gs, tmp);
-	err |= __put_user(tmp, (unsigned int __user *)&sc->gs);
-
-	err |= __put_user(regs->xes, (unsigned int __user *)&sc->es);
-	err |= __put_user(regs->xds, (unsigned int __user *)&sc->ds);
-	err |= __put_user(regs->edi, &sc->edi);
-	err |= __put_user(regs->esi, &sc->esi);
-	err |= __put_user(regs->ebp, &sc->ebp);
-	err |= __put_user(regs->esp, &sc->esp);
-	err |= __put_user(regs->ebx, &sc->ebx);
-	err |= __put_user(regs->edx, &sc->edx);
-	err |= __put_user(regs->ecx, &sc->ecx);
-	err |= __put_user(regs->eax, &sc->eax);
-	err |= __put_user(current->thread.trap_no, &sc->trapno);
-	err |= __put_user(current->thread.error_code, &sc->err);
-	err |= __put_user(regs->eip, &sc->eip);
-	err |= __put_user(regs->xcs, (unsigned int __user *)&sc->cs);
-	err |= __put_user(regs->eflags, &sc->eflags);
-	err |= __put_user(regs->esp, &sc->esp_at_signal);
-	err |= __put_user(regs->xss, (unsigned int __user *)&sc->ss);
-
-	tmp = save_i387(fpstate);
-	if (tmp < 0)
-	  err = 1;
-	else
-	  err |= __put_user(tmp ? fpstate : NULL, &sc->fpstate);
-
-	/* non-iBCS2 extensions.. */
-	err |= __put_user(mask, &sc->oldmask);
-	err |= __put_user(current->thread.cr2, &sc->cr2);
-
-	return err;
-}
-
-/*
- * Determine which stack to use..
- */
-static inline void __user *
-get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
-{
-	unsigned long esp;
-
-	/* Default to using normal stack */
-	esp = regs->esp;
-
-	/* This is the X/Open sanctioned signal stack switching.  */
-	if (ka->sa.sa_flags & SA_ONSTACK) {
-		if (sas_ss_flags(esp) == 0)
-			esp = current->sas_ss_sp + current->sas_ss_size;
-	}
-
-	/* This is the legacy signal stack switching. */
-	else if ((regs->xss & 0xffff) != __USER_DS &&
-		 !(ka->sa.sa_flags & SA_RESTORER) &&
-		 ka->sa.sa_restorer) {
-		esp = (unsigned long) ka->sa.sa_restorer;
-	}
-
-	esp -= frame_size;
-	/* Align the stack pointer according to the i386 ABI,
-	 * i.e. so that on function entry ((sp + 4) & 15) == 0. */
-	esp = ((esp + 4) & -16ul) - 4;
-	return (void __user *) esp;
-}
-
-/* These symbols are defined with the addresses in the vsyscall page.
-   See vsyscall-sigreturn.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)
-{
-	void __user *restorer;
-	struct sigframe __user *frame;
-	int err = 0;
-	int usig;
-
-	frame = get_sigframe(ka, regs, sizeof(*frame));
-
-	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
-		goto give_sigsegv;
-
-	usig = current_thread_info()->exec_domain
-		&& current_thread_info()->exec_domain->signal_invmap
-		&& sig < 32
-		? current_thread_info()->exec_domain->signal_invmap[sig]
-		: sig;
-
-	err = __put_user(usig, &frame->sig);
-	if (err)
-		goto give_sigsegv;
-
-	err = setup_sigcontext(&frame->sc, &frame->fpstate, regs, set->sig[0]);
-	if (err)
-		goto give_sigsegv;
-
-	if (_NSIG_WORDS > 1) {
-		err = __copy_to_user(&frame->extramask, &set->sig[1],
-				      sizeof(frame->extramask));
-		if (err)
-			goto give_sigsegv;
-	}
-
-	if (current->binfmt->hasvdso)
-		restorer = (void *)VDSO_SYM(&__kernel_sigreturn);
-	else
-		restorer = (void *)&frame->retcode;
-	if (ka->sa.sa_flags & SA_RESTORER)
-		restorer = ka->sa.sa_restorer;
-
-	/* Set up to return from userspace.  */
-	err |= __put_user(restorer, &frame->pretcode);
-	 
-	/*
-	 * This is popl %eax ; movl $,%eax ; int $0x80
-	 *
-	 * WE DO NOT USE IT ANY MORE! It's only left here for historical
-	 * reasons and because gdb uses it as a signature to notice
-	 * signal handler stack frames.
-	 */
-	err |= __put_user(0xb858, (short __user *)(frame->retcode+0));
-	err |= __put_user(__NR_sigreturn, (int __user *)(frame->retcode+2));
-	err |= __put_user(0x80cd, (short __user *)(frame->retcode+6));
-
-	if (err)
-		goto give_sigsegv;
-
-	/* Set up registers for signal handler */
-	regs->esp = (unsigned long) frame;
-	regs->eip = (unsigned long) ka->sa.sa_handler;
-	regs->eax = (unsigned long) sig;
-	regs->edx = (unsigned long) 0;
-	regs->ecx = (unsigned long) 0;
-
-	set_fs(USER_DS);
-	regs->xds = __USER_DS;
-	regs->xes = __USER_DS;
-	regs->xss = __USER_DS;
-	regs->xcs = __USER_CS;
-
-	/*
-	 * Clear TF when entering the signal handler, but
-	 * notify any tracer that was single-stepping it.
-	 * The tracer may want to single-step inside the
-	 * handler too.
-	 */
-	regs->eflags &= ~TF_MASK;
-	if (test_thread_flag(TIF_SINGLESTEP))
-		ptrace_notify(SIGTRAP);
-
-#if DEBUG_SIG
-	printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
-		current->comm, current->pid, frame, regs->eip, frame->pretcode);
-#endif
-
-	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)
-{
-	void __user *restorer;
-	struct rt_sigframe __user *frame;
-	int err = 0;
-	int usig;
-
-	frame = get_sigframe(ka, regs, sizeof(*frame));
-
-	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
-		goto give_sigsegv;
-
-	usig = current_thread_info()->exec_domain
-		&& current_thread_info()->exec_domain->signal_invmap
-		&& sig < 32
-		? current_thread_info()->exec_domain->signal_invmap[sig]
-		: sig;
-
-	err |= __put_user(usig, &frame->sig);
-	err |= __put_user(&frame->info, &frame->pinfo);
-	err |= __put_user(&frame->uc, &frame->puc);
-	err |= copy_siginfo_to_user(&frame->info, info);
-	if (err)
-		goto give_sigsegv;
-
-	/* Create the ucontext.  */
-	err |= __put_user(0, &frame->uc.uc_flags);
-	err |= __put_user(0, &frame->uc.uc_link);
-	err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
-	err |= __put_user(sas_ss_flags(regs->esp),
-			  &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, &frame->fpstate,
-			        regs, set->sig[0]);
-	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
-	if (err)
-		goto give_sigsegv;
-
-	/* Set up to return from userspace.  */
-	restorer = (void *)VDSO_SYM(&__kernel_rt_sigreturn);
-	if (ka->sa.sa_flags & SA_RESTORER)
-		restorer = ka->sa.sa_restorer;
-	err |= __put_user(restorer, &frame->pretcode);
-	 
-	/*
-	 * This is movl $,%eax ; int $0x80
-	 *
-	 * WE DO NOT USE IT ANY MORE! It's only left here for historical
-	 * reasons and because gdb uses it as a signature to notice
-	 * signal handler stack frames.
-	 */
-	err |= __put_user(0xb8, (char __user *)(frame->retcode+0));
-	err |= __put_user(__NR_rt_sigreturn, (int __user *)(frame->retcode+1));
-	err |= __put_user(0x80cd, (short __user *)(frame->retcode+5));
-
-	if (err)
-		goto give_sigsegv;
-
-	/* Set up registers for signal handler */
-	regs->esp = (unsigned long) frame;
-	regs->eip = (unsigned long) ka->sa.sa_handler;
-	regs->eax = (unsigned long) usig;
-	regs->edx = (unsigned long) &frame->info;
-	regs->ecx = (unsigned long) &frame->uc;
-
-	set_fs(USER_DS);
-	regs->xds = __USER_DS;
-	regs->xes = __USER_DS;
-	regs->xss = __USER_DS;
-	regs->xcs = __USER_CS;
-
-	/*
-	 * Clear TF when entering the signal handler, but
-	 * notify any tracer that was single-stepping it.
-	 * The tracer may want to single-step inside the
-	 * handler too.
-	 */
-	regs->eflags &= ~TF_MASK;
-	if (test_thread_flag(TIF_SINGLESTEP))
-		ptrace_notify(SIGTRAP);
-
-#if DEBUG_SIG
-	printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
-		current->comm, current->pid, frame, regs->eip, frame->pretcode);
-#endif
-
-	return 0;
-
-give_sigsegv:
-	force_sigsegv(sig, current);
-	return -EFAULT;
-}
-
-/*
- * OK, we're invoking a handler
- */	
-
-static int
-handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
-	      sigset_t *oldset,	struct pt_regs * regs)
-{
-	int ret;
-
-	/* Are we from a system call? */
-	if (regs->orig_eax >= 0) {
-		/* If so, check system call restarting.. */
-		switch (regs->eax) {
-		        case -ERESTART_RESTARTBLOCK:
-			case -ERESTARTNOHAND:
-				regs->eax = -EINTR;
-				break;
-
-			case -ERESTARTSYS:
-				if (!(ka->sa.sa_flags & SA_RESTART)) {
-					regs->eax = -EINTR;
-					break;
-				}
-			/* fallthrough */
-			case -ERESTARTNOINTR:
-				regs->eax = regs->orig_eax;
-				regs->eip -= 2;
-		}
-	}
-
-	/*
-	 * If TF is set due to a debugger (PT_DTRACE), clear the TF flag so
-	 * that register information in the sigcontext is correct.
-	 */
-	if (unlikely(regs->eflags & TF_MASK)
-	    && likely(current->ptrace & PT_DTRACE)) {
-		current->ptrace &= ~PT_DTRACE;
-		regs->eflags &= ~TF_MASK;
-	}
-
-	/* Set up the stack frame */
-	if (ka->sa.sa_flags & SA_SIGINFO)
-		ret = setup_rt_frame(sig, ka, info, oldset, regs);
-	else
-		ret = setup_frame(sig, ka, oldset, regs);
-
-	if (ret == 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.
- */
-static void fastcall do_signal(struct pt_regs *regs)
-{
-	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.  vm86 regs switched out by assembly code
- 	 * before reaching here, so testing against kernel
- 	 * CS suffices.
-	 */
-	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) {
-		/* Reenable any watchpoints before delivering the
-		 * signal to user space. The processor register will
-		 * have been cleared if the watchpoint triggered
-		 * inside the kernel.
-		 */
-		if (unlikely(current->thread.debugreg[7]))
-			set_debugreg(current->thread.debugreg[7], 7);
-
-		/* 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;
-	}
-
-	/* Did we come from a system call? */
-	if (regs->orig_eax >= 0) {
-		/* Restart the system call - no handlers present */
-		switch (regs->eax) {
-		case -ERESTARTNOHAND:
-		case -ERESTARTSYS:
-		case -ERESTARTNOINTR:
-			regs->eax = regs->orig_eax;
-			regs->eip -= 2;
-			break;
-
-		case -ERESTART_RESTARTBLOCK:
-			regs->eax = __NR_restart_syscall;
-			regs->eip -= 2;
-			break;
-		}
-	}
-
-	/* 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
- */
-__attribute__((regparm(3)))
-void do_notify_resume(struct pt_regs *regs, void *_unused,
-		      __u32 thread_info_flags)
-{
-	/* Pending single-step? */
-	if (thread_info_flags & _TIF_SINGLESTEP) {
-		regs->eflags |= TF_MASK;
-		clear_thread_flag(TIF_SINGLESTEP);
-	}
-
-	/* deal with pending signal delivery */
-	if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
-		do_signal(regs);
-	
-	clear_thread_flag(TIF_IRET);
-}