Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 672 insertions, 0 deletions

diff --git a/arch/alpha/kernel/signal.c b/arch/alpha/kernel/signal.c
new file mode 100644
index 000000000000..08fe8071a7f8
--- /dev/null
+++ b/arch/alpha/kernel/signal.c
@@ -0,0 +1,672 @@
+/*
+ *  linux/arch/alpha/kernel/signal.c
+ *
+ *  Copyright (C) 1995  Linus Torvalds
+ *
+ *  1997-11-02  Modified for POSIX.1b signals by Richard Henderson
+ */
+
+#include <linux/sched.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/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/stddef.h>
+#include <linux/tty.h>
+#include <linux/binfmts.h>
+#include <linux/bitops.h>
+
+#include <asm/uaccess.h>
+#include <asm/sigcontext.h>
+#include <asm/ucontext.h>
+
+#include "proto.h"
+
+
+#define DEBUG_SIG 0
+
+#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+
+asmlinkage void ret_from_sys_call(void);
+static int do_signal(sigset_t *, struct pt_regs *, struct switch_stack *,
+                     unsigned long, unsigned long);
+
+
+/*
+ * The OSF/1 sigprocmask calling sequence is different from the
+ * C sigprocmask() sequence..
+ *
+ * how:
+ * 1 - SIG_BLOCK
+ * 2 - SIG_UNBLOCK
+ * 3 - SIG_SETMASK
+ *
+ * We change the range to -1 .. 1 in order to let gcc easily
+ * use the conditional move instructions.
+ *
+ * Note that we don't need to acquire the kernel lock for SMP
+ * operation, as all of this is local to this thread.
+ */
+asmlinkage unsigned long
+do_osf_sigprocmask(int how, unsigned long newmask, struct pt_regs *regs)
+{
+        unsigned long oldmask = -EINVAL;
+
+        if ((unsigned long)how-1 <= 2) {
+                long sign = how-2;              /* -1 .. 1 */
+                unsigned long block, unblock;
+
+                newmask &= _BLOCKABLE;
+                spin_lock_irq(&current->sighand->siglock);
+                oldmask = current->blocked.sig[0];
+
+                unblock = oldmask & ~newmask;
+                block = oldmask | newmask;
+                if (!sign)
+                        block = unblock;
+                if (sign <= 0)
+                        newmask = block;
+                if (_NSIG_WORDS > 1 && sign > 0)
+                        sigemptyset(&current->blocked);
+                current->blocked.sig[0] = newmask;
+                recalc_sigpending();
+                spin_unlock_irq(&current->sighand->siglock);
+
+                regs->r0 = 0;           /* special no error return */
+        }
+        return oldmask;
+}
+
+asmlinkage int 
+osf_sigaction(int sig, const struct osf_sigaction __user *act,
+              struct osf_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_flags, &act->sa_flags))
+                        return -EFAULT;
+                __get_user(mask, &act->sa_mask);
+                siginitset(&new_ka.sa.sa_mask, mask);
+                new_ka.ka_restorer = NULL;
+        }
+
+        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_flags, &oact->sa_flags))
+                        return -EFAULT;
+                __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
+        }
+
+        return ret;
+}
+
+asmlinkage long
+sys_rt_sigaction(int sig, const struct sigaction __user *act,
+                 struct sigaction __user *oact,
+                 size_t sigsetsize, void __user *restorer)
+{
+        struct k_sigaction new_ka, old_ka;
+        int ret;
+
+        /* XXX: Don't preclude handling different sized sigset_t's.  */
+        if (sigsetsize != sizeof(sigset_t))
+                return -EINVAL;
+
+        if (act) {
+                new_ka.ka_restorer = restorer;
+                if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
+                        return -EFAULT;
+        }
+
+        ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
+
+        if (!ret && oact) {
+                if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
+                        return -EFAULT;
+        }
+
+        return ret;
+}
+
+/*
+ * Atomically swap in the new signal mask, and wait for a signal.
+ */
+asmlinkage int
+do_sigsuspend(old_sigset_t mask, struct pt_regs *regs, struct switch_stack *sw)
+{
+        sigset_t oldset;
+
+        mask &= _BLOCKABLE;
+        spin_lock_irq(&current->sighand->siglock);
+        oldset = current->blocked;
+        siginitset(&current->blocked, mask);
+        recalc_sigpending();
+        spin_unlock_irq(&current->sighand->siglock);
+
+        /* Indicate EINTR on return from any possible signal handler,
+           which will not come back through here, but via sigreturn.  */
+        regs->r0 = EINTR;
+        regs->r19 = 1;
+
+        while (1) {
+                current->state = TASK_INTERRUPTIBLE;
+                schedule();
+                if (do_signal(&oldset, regs, sw, 0, 0))
+                        return -EINTR;
+        }
+}
+
+asmlinkage int
+do_rt_sigsuspend(sigset_t __user *uset, size_t sigsetsize,
+                 struct pt_regs *regs, struct switch_stack *sw)
+{
+        sigset_t oldset, set;
+
+        /* XXX: Don't preclude handling different sized sigset_t's.  */
+        if (sigsetsize != sizeof(sigset_t))
+                return -EINVAL;
+        if (copy_from_user(&set, uset, sizeof(set)))
+                return -EFAULT;
+
+        sigdelsetmask(&set, ~_BLOCKABLE);
+        spin_lock_irq(&current->sighand->siglock);
+        oldset = current->blocked;
+        current->blocked = set;
+        recalc_sigpending();
+        spin_unlock_irq(&current->sighand->siglock);
+
+        /* Indicate EINTR on return from any possible signal handler,
+           which will not come back through here, but via sigreturn.  */
+        regs->r0 = EINTR;
+        regs->r19 = 1;
+
+        while (1) {
+                current->state = TASK_INTERRUPTIBLE;
+                schedule();
+                if (do_signal(&oldset, regs, sw, 0, 0))
+                        return -EINTR;
+        }
+}
+
+asmlinkage int
+sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
+{
+        return do_sigaltstack(uss, uoss, rdusp());
+}
+
+/*
+ * Do a signal return; undo the signal stack.
+ */
+
+#if _NSIG_WORDS > 1
+# error "Non SA_SIGINFO frame needs rearranging"
+#endif
+
+struct sigframe
+{
+        struct sigcontext sc;
+        unsigned int retcode[3];
+};
+
+struct rt_sigframe
+{
+        struct siginfo info;
+        struct ucontext uc;
+        unsigned int retcode[3];
+};
+
+/* If this changes, userland unwinders that Know Things about our signal
+   frame will break.  Do not undertake lightly.  It also implies an ABI
+   change wrt the size of siginfo_t, which may cause some pain.  */
+extern char compile_time_assert
+        [offsetof(struct rt_sigframe, uc.uc_mcontext) == 176 ? 1 : -1];
+
+#define INSN_MOV_R30_R16        0x47fe0410
+#define INSN_LDI_R0             0x201f0000
+#define INSN_CALLSYS            0x00000083
+
+static long
+restore_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
+                   struct switch_stack *sw)
+{
+        unsigned long usp;
+        long i, err = __get_user(regs->pc, &sc->sc_pc);
+
+        sw->r26 = (unsigned long) ret_from_sys_call;
+
+        err |= __get_user(regs->r0, sc->sc_regs+0);
+        err |= __get_user(regs->r1, sc->sc_regs+1);
+        err |= __get_user(regs->r2, sc->sc_regs+2);
+        err |= __get_user(regs->r3, sc->sc_regs+3);
+        err |= __get_user(regs->r4, sc->sc_regs+4);
+        err |= __get_user(regs->r5, sc->sc_regs+5);
+        err |= __get_user(regs->r6, sc->sc_regs+6);
+        err |= __get_user(regs->r7, sc->sc_regs+7);
+        err |= __get_user(regs->r8, sc->sc_regs+8);
+        err |= __get_user(sw->r9, sc->sc_regs+9);
+        err |= __get_user(sw->r10, sc->sc_regs+10);
+        err |= __get_user(sw->r11, sc->sc_regs+11);
+        err |= __get_user(sw->r12, sc->sc_regs+12);
+        err |= __get_user(sw->r13, sc->sc_regs+13);
+        err |= __get_user(sw->r14, sc->sc_regs+14);
+        err |= __get_user(sw->r15, sc->sc_regs+15);
+        err |= __get_user(regs->r16, sc->sc_regs+16);
+        err |= __get_user(regs->r17, sc->sc_regs+17);
+        err |= __get_user(regs->r18, sc->sc_regs+18);
+        err |= __get_user(regs->r19, sc->sc_regs+19);
+        err |= __get_user(regs->r20, sc->sc_regs+20);
+        err |= __get_user(regs->r21, sc->sc_regs+21);
+        err |= __get_user(regs->r22, sc->sc_regs+22);
+        err |= __get_user(regs->r23, sc->sc_regs+23);
+        err |= __get_user(regs->r24, sc->sc_regs+24);
+        err |= __get_user(regs->r25, sc->sc_regs+25);
+        err |= __get_user(regs->r26, sc->sc_regs+26);
+        err |= __get_user(regs->r27, sc->sc_regs+27);
+        err |= __get_user(regs->r28, sc->sc_regs+28);
+        err |= __get_user(regs->gp, sc->sc_regs+29);
+        err |= __get_user(usp, sc->sc_regs+30);
+        wrusp(usp);
+
+        for (i = 0; i < 31; i++)
+                err |= __get_user(sw->fp[i], sc->sc_fpregs+i);
+        err |= __get_user(sw->fp[31], &sc->sc_fpcr);
+
+        return err;
+}
+
+/* Note that this syscall is also used by setcontext(3) to install
+   a given sigcontext.  This because it's impossible to set *all*
+   registers and transfer control from userland.  */
+
+asmlinkage void
+do_sigreturn(struct sigcontext __user *sc, struct pt_regs *regs,
+             struct switch_stack *sw)
+{
+        sigset_t set;
+
+        /* Verify that it's a good sigcontext before using it */
+        if (!access_ok(VERIFY_READ, sc, sizeof(*sc)))
+                goto give_sigsegv;
+        if (__get_user(set.sig[0], &sc->sc_mask))
+                goto give_sigsegv;
+
+        sigdelsetmask(&set, ~_BLOCKABLE);
+        spin_lock_irq(&current->sighand->siglock);
+        current->blocked = set;
+        recalc_sigpending();
+        spin_unlock_irq(&current->sighand->siglock);
+
+        if (restore_sigcontext(sc, regs, sw))
+                goto give_sigsegv;
+
+        /* Send SIGTRAP if we're single-stepping: */
+        if (ptrace_cancel_bpt (current)) {
+                siginfo_t info;
+
+                info.si_signo = SIGTRAP;
+                info.si_errno = 0;
+                info.si_code = TRAP_BRKPT;
+                info.si_addr = (void __user *) regs->pc;
+                info.si_trapno = 0;
+                send_sig_info(SIGTRAP, &info, current);
+        }
+        return;
+
+give_sigsegv:
+        force_sig(SIGSEGV, current);
+}
+
+asmlinkage void
+do_rt_sigreturn(struct rt_sigframe __user *frame, struct pt_regs *regs,
+                struct switch_stack *sw)
+{
+        sigset_t set;
+
+        /* Verify that it's a good ucontext_t before using it */
+        if (!access_ok(VERIFY_READ, &frame->uc, sizeof(frame->uc)))
+                goto give_sigsegv;
+        if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
+                goto give_sigsegv;
+
+        sigdelsetmask(&set, ~_BLOCKABLE);
+        spin_lock_irq(&current->sighand->siglock);
+        current->blocked = set;
+        recalc_sigpending();
+        spin_unlock_irq(&current->sighand->siglock);
+
+        if (restore_sigcontext(&frame->uc.uc_mcontext, regs, sw))
+                goto give_sigsegv;
+
+        /* Send SIGTRAP if we're single-stepping: */
+        if (ptrace_cancel_bpt (current)) {
+                siginfo_t info;
+
+                info.si_signo = SIGTRAP;
+                info.si_errno = 0;
+                info.si_code = TRAP_BRKPT;
+                info.si_addr = (void __user *) regs->pc;
+                info.si_trapno = 0;
+                send_sig_info(SIGTRAP, &info, current);
+        }
+        return;
+
+give_sigsegv:
+        force_sig(SIGSEGV, current);
+}
+
+
+/*
+ * Set up a signal frame.
+ */
+
+static inline void __user *
+get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
+{
+        if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! on_sig_stack(sp))
+                sp = current->sas_ss_sp + current->sas_ss_size;
+
+        return (void __user *)((sp - frame_size) & -32ul);
+}
+
+static long
+setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, 
+                 struct switch_stack *sw, unsigned long mask, unsigned long sp)
+{
+        long i, err = 0;
+
+        err |= __put_user(on_sig_stack((unsigned long)sc), &sc->sc_onstack);
+        err |= __put_user(mask, &sc->sc_mask);
+        err |= __put_user(regs->pc, &sc->sc_pc);
+        err |= __put_user(8, &sc->sc_ps);
+
+        err |= __put_user(regs->r0 , sc->sc_regs+0);
+        err |= __put_user(regs->r1 , sc->sc_regs+1);
+        err |= __put_user(regs->r2 , sc->sc_regs+2);
+        err |= __put_user(regs->r3 , sc->sc_regs+3);
+        err |= __put_user(regs->r4 , sc->sc_regs+4);
+        err |= __put_user(regs->r5 , sc->sc_regs+5);
+        err |= __put_user(regs->r6 , sc->sc_regs+6);
+        err |= __put_user(regs->r7 , sc->sc_regs+7);
+        err |= __put_user(regs->r8 , sc->sc_regs+8);
+        err |= __put_user(sw->r9   , sc->sc_regs+9);
+        err |= __put_user(sw->r10  , sc->sc_regs+10);
+        err |= __put_user(sw->r11  , sc->sc_regs+11);
+        err |= __put_user(sw->r12  , sc->sc_regs+12);
+        err |= __put_user(sw->r13  , sc->sc_regs+13);
+        err |= __put_user(sw->r14  , sc->sc_regs+14);
+        err |= __put_user(sw->r15  , sc->sc_regs+15);
+        err |= __put_user(regs->r16, sc->sc_regs+16);
+        err |= __put_user(regs->r17, sc->sc_regs+17);
+        err |= __put_user(regs->r18, sc->sc_regs+18);
+        err |= __put_user(regs->r19, sc->sc_regs+19);
+        err |= __put_user(regs->r20, sc->sc_regs+20);
+        err |= __put_user(regs->r21, sc->sc_regs+21);
+        err |= __put_user(regs->r22, sc->sc_regs+22);
+        err |= __put_user(regs->r23, sc->sc_regs+23);
+        err |= __put_user(regs->r24, sc->sc_regs+24);
+        err |= __put_user(regs->r25, sc->sc_regs+25);
+        err |= __put_user(regs->r26, sc->sc_regs+26);
+        err |= __put_user(regs->r27, sc->sc_regs+27);
+        err |= __put_user(regs->r28, sc->sc_regs+28);
+        err |= __put_user(regs->gp , sc->sc_regs+29);
+        err |= __put_user(sp, sc->sc_regs+30);
+        err |= __put_user(0, sc->sc_regs+31);
+
+        for (i = 0; i < 31; i++)
+                err |= __put_user(sw->fp[i], sc->sc_fpregs+i);
+        err |= __put_user(0, sc->sc_fpregs+31);
+        err |= __put_user(sw->fp[31], &sc->sc_fpcr);
+
+        err |= __put_user(regs->trap_a0, &sc->sc_traparg_a0);
+        err |= __put_user(regs->trap_a1, &sc->sc_traparg_a1);
+        err |= __put_user(regs->trap_a2, &sc->sc_traparg_a2);
+
+        return err;
+}
+
+static void
+setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
+            struct pt_regs *regs, struct switch_stack * sw)
+{
+        unsigned long oldsp, r26, err = 0;
+        struct sigframe __user *frame;
+
+        oldsp = rdusp();
+        frame = get_sigframe(ka, oldsp, sizeof(*frame));
+        if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+                goto give_sigsegv;
+
+        err |= setup_sigcontext(&frame->sc, regs, sw, set->sig[0], oldsp);
+        if (err)
+                goto give_sigsegv;
+
+        /* Set up to return from userspace.  If provided, use a stub
+           already in userspace.  */
+        if (ka->ka_restorer) {
+                r26 = (unsigned long) ka->ka_restorer;
+        } else {
+                err |= __put_user(INSN_MOV_R30_R16, frame->retcode+0);
+                err |= __put_user(INSN_LDI_R0+__NR_sigreturn, frame->retcode+1);
+                err |= __put_user(INSN_CALLSYS, frame->retcode+2);
+                imb();
+                r26 = (unsigned long) frame->retcode;
+        }
+
+        /* Check that everything was written properly.  */
+        if (err)
+                goto give_sigsegv;
+
+        /* "Return" to the handler */
+        regs->r26 = r26;
+        regs->r27 = regs->pc = (unsigned long) ka->sa.sa_handler;
+        regs->r16 = sig;                        /* a0: signal number */
+        regs->r17 = 0;                          /* a1: exception code */
+        regs->r18 = (unsigned long) &frame->sc; /* a2: sigcontext pointer */
+        wrusp((unsigned long) frame);
+        
+#if DEBUG_SIG
+        printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
+                current->comm, current->pid, frame, regs->pc, regs->r26);
+#endif
+
+        return;
+
+give_sigsegv:
+        force_sigsegv(sig, current);
+}
+
+static void
+setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+               sigset_t *set, struct pt_regs *regs, struct switch_stack * sw)
+{
+        unsigned long oldsp, r26, err = 0;
+        struct rt_sigframe __user *frame;
+
+        oldsp = rdusp();
+        frame = get_sigframe(ka, oldsp, sizeof(*frame));
+        if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+                goto give_sigsegv;
+
+        err |= copy_siginfo_to_user(&frame->info, info);
+
+        /* Create the ucontext.  */
+        err |= __put_user(0, &frame->uc.uc_flags);
+        err |= __put_user(0, &frame->uc.uc_link);
+        err |= __put_user(set->sig[0], &frame->uc.uc_osf_sigmask);
+        err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
+        err |= __put_user(sas_ss_flags(oldsp), &frame->uc.uc_stack.ss_flags);
+        err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
+        err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, sw,
+                                set->sig[0], oldsp);
+        err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+        if (err)
+                goto give_sigsegv;
+
+        /* Set up to return from userspace.  If provided, use a stub
+           already in userspace.  */
+        if (ka->ka_restorer) {
+                r26 = (unsigned long) ka->ka_restorer;
+        } else {
+                err |= __put_user(INSN_MOV_R30_R16, frame->retcode+0);
+                err |= __put_user(INSN_LDI_R0+__NR_rt_sigreturn,
+                                  frame->retcode+1);
+                err |= __put_user(INSN_CALLSYS, frame->retcode+2);
+                imb();
+                r26 = (unsigned long) frame->retcode;
+        }
+
+        if (err)
+                goto give_sigsegv;
+
+        /* "Return" to the handler */
+        regs->r26 = r26;
+        regs->r27 = regs->pc = (unsigned long) ka->sa.sa_handler;
+        regs->r16 = sig;                          /* a0: signal number */
+        regs->r17 = (unsigned long) &frame->info; /* a1: siginfo pointer */
+        regs->r18 = (unsigned long) &frame->uc;   /* a2: ucontext pointer */
+        wrusp((unsigned long) frame);
+
+#if DEBUG_SIG
+        printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
+                current->comm, current->pid, frame, regs->pc, regs->r26);
+#endif
+
+        return;
+
+give_sigsegv:
+        force_sigsegv(sig, current);
+}
+
+
+/*
+ * OK, we're invoking a handler.
+ */
+static inline void
+handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
+              sigset_t *oldset, struct pt_regs * regs, struct switch_stack *sw)
+{
+        if (ka->sa.sa_flags & SA_SIGINFO)
+                setup_rt_frame(sig, ka, info, oldset, regs, sw);
+        else
+                setup_frame(sig, ka, oldset, regs, sw);
+
+        if (ka->sa.sa_flags & SA_RESETHAND)
+                ka->sa.sa_handler = SIG_DFL;
+
+        if (!(ka->sa.sa_flags & SA_NODEFER)) {
+                spin_lock_irq(&current->sighand->siglock);
+                sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
+                sigaddset(&current->blocked,sig);
+                recalc_sigpending();
+                spin_unlock_irq(&current->sighand->siglock);
+        }
+}
+
+static inline void
+syscall_restart(unsigned long r0, unsigned long r19,
+                struct pt_regs *regs, struct k_sigaction *ka)
+{
+        switch (regs->r0) {
+        case ERESTARTSYS:
+                if (!(ka->sa.sa_flags & SA_RESTART)) {
+                case ERESTARTNOHAND:
+                        regs->r0 = EINTR;
+                        break;
+                }
+                /* fallthrough */
+        case ERESTARTNOINTR:
+                regs->r0 = r0;  /* reset v0 and a3 and replay syscall */
+                regs->r19 = r19;
+                regs->pc -= 4;
+                break;
+        case ERESTART_RESTARTBLOCK:
+                current_thread_info()->restart_block.fn = do_no_restart_syscall;
+                regs->r0 = EINTR;
+                break;
+        }
+}
+
+
+/*
+ * Note that 'init' is a special process: it doesn't get signals it doesn't
+ * want to handle. Thus you cannot kill init even with a SIGKILL even by
+ * mistake.
+ *
+ * Note that we go through the signals twice: once to check the signals that
+ * the kernel can handle, and then we build all the user-level signal handling
+ * stack-frames in one go after that.
+ *
+ * "r0" and "r19" are the registers we need to restore for system call
+ * restart. "r0" is also used as an indicator whether we can restart at
+ * all (if we get here from anything but a syscall return, it will be 0)
+ */
+static int
+do_signal(sigset_t *oldset, struct pt_regs * regs, struct switch_stack * sw,
+          unsigned long r0, unsigned long r19)
+{
+        siginfo_t info;
+        int signr;
+        unsigned long single_stepping = ptrace_cancel_bpt(current);
+        struct k_sigaction ka;
+
+        if (!oldset)
+                oldset = &current->blocked;
+
+        /* This lets the debugger run, ... */
+        signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+        /* ... so re-check the single stepping. */
+        single_stepping |= ptrace_cancel_bpt(current);
+
+        if (signr > 0) {
+                /* Whee!  Actually deliver the signal.  */
+                if (r0) syscall_restart(r0, r19, regs, &ka);
+                handle_signal(signr, &ka, &info, oldset, regs, sw);
+                if (single_stepping) 
+                        ptrace_set_bpt(current); /* re-set bpt */
+                return 1;
+        }
+
+        if (r0) {
+                switch (regs->r0) {
+                case ERESTARTNOHAND:
+                case ERESTARTSYS:
+                case ERESTARTNOINTR:
+                        /* Reset v0 and a3 and replay syscall.  */
+                        regs->r0 = r0;
+                        regs->r19 = r19;
+                        regs->pc -= 4;
+                        break;
+                case ERESTART_RESTARTBLOCK:
+                        /* Force v0 to the restart syscall and reply.  */
+                        regs->r0 = __NR_restart_syscall;
+                        regs->pc -= 4;
+                        break;
+                }
+        }
+        if (single_stepping)
+                ptrace_set_bpt(current);        /* re-set breakpoint */
+
+        return 0;
+}
+
+void
+do_notify_resume(sigset_t *oldset, struct pt_regs *regs,
+                 struct switch_stack *sw, unsigned long r0,
+                 unsigned long r19, unsigned long thread_info_flags)
+{
+        if (thread_info_flags & _TIF_SIGPENDING)
+                do_signal(oldset, regs, sw, r0, r19);
+}