i386: prepare shared kernel/signal.c
authorThomas Gleixner <tglx@linutronix.de>
Thu, 11 Oct 2007 09:12:33 +0000 (11:12 +0200)
committerThomas Gleixner <tglx@linutronix.de>
Thu, 11 Oct 2007 09:12:33 +0000 (11:12 +0200)
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
arch/i386/kernel/Makefile
arch/i386/kernel/signal.c [deleted file]
arch/i386/kernel/signal_32.c [new file with mode: 0644]

index 838f347c2580799c45ab999e1774facacfa51fe5..4ff5e93d23c9570e0c689e4df285b1553a0a59fd 100644 (file)
@@ -4,7 +4,7 @@
 
 extra-y := head.o init_task.o vmlinux.lds
 
-obj-y  := process.o signal.o entry.o traps_32.o irq.o \
+obj-y  := process.o signal_32.o entry.o traps_32.o irq.o \
                ptrace.o time.o ioport_32.o ldt.o setup_32.o i8259_32.o sys_i386_32.o \
                pci-dma_32.o i386_ksyms.o i387.o bootflag.o e820_32.o\
                quirks.o i8237.o topology.o alternative.o i8253_32.o tsc.o
diff --git a/arch/i386/kernel/signal.c b/arch/i386/kernel/signal.c
deleted file mode 100644 (file)
index f5dd856..0000000
+++ /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);
-}
diff --git a/arch/i386/kernel/signal_32.c b/arch/i386/kernel/signal_32.c
new file mode 100644 (file)
index 0000000..f5dd856
--- /dev/null
@@ -0,0 +1,667 @@
+/*
+ *  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);
+}