/*
 *  linux/arch/ppc/kernel/signal.c
 *
 *  PowerPC version
 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
 *
 *  Derived from "arch/i386/kernel/signal.c"
 *    Copyright (C) 1991, 1992 Linus Torvalds
 *    1997-11-28  Modified for POSIX.1b signals by Richard Henderson
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 */

#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.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/stddef.h>
#include <linux/elf.h>
#include <asm/ucontext.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>

#define DEBUG_SIG 0

#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))

#ifndef MIN
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
#endif

#define GP_REGS_SIZE    MIN(sizeof(elf_gregset_t), sizeof(struct pt_regs))

extern void syscall_direct_return(struct pt_regs *regs);

int do_signal(sigset_t *oldset, struct pt_regs *regs);

int copy_siginfo_to_user(siginfo_t *to, siginfo_t *from)
{
        if (!access_ok (VERIFY_WRITE, to, sizeof(siginfo_t)))
                return -EFAULT;
        if (from->si_code < 0)
                return __copy_to_user(to, from, sizeof(siginfo_t));
        else {
                int err;

                /* If you change siginfo_t structure, please be sure
                   this code is fixed accordingly.
                   It should never copy any pad contained in the structure
                   to avoid security leaks, but must copy the generic
                   3 ints plus the relevant union member.  */
                err = __put_user(from->si_signo, &to->si_signo);
                err |= __put_user(from->si_errno, &to->si_errno);
                err |= __put_user((short)from->si_code, &to->si_code);
                /* First 32bits of unions are always present.  */
                err |= __put_user(from->si_pid, &to->si_pid);
                switch (from->si_code >> 16) {
                case __SI_FAULT >> 16:
                        break;
                case __SI_CHLD >> 16:
                        err |= __put_user(from->si_utime, &to->si_utime);
                        err |= __put_user(from->si_stime, &to->si_stime);
                        err |= __put_user(from->si_status, &to->si_status);
                default:
                        err |= __put_user(from->si_uid, &to->si_uid);
                        break;
                /* case __SI_RT: This is not generated by the kernel as of now.  */
                }
                return err;
        }
}

/*
 * Atomically swap in the new signal mask, and wait for a signal.
 */
int
sys_sigsuspend(old_sigset_t mask, int p2, int p3, int p4, int p6, int p7,
               struct pt_regs *regs)
{
        sigset_t saveset;

        mask &= _BLOCKABLE;
        spin_lock_irq(&current->sigmask_lock);
        saveset = current->blocked;
        siginitset(&current->blocked, mask);
        recalc_sigpending(current);
        spin_unlock_irq(&current->sigmask_lock);

        regs->result = -EINTR;
        regs->gpr[3] = EINTR;
        regs->ccr |= 0x10000000;
        while (1) {
                current->state = TASK_INTERRUPTIBLE;
                schedule();
                if (do_signal(&saveset, regs))
                        /*
                         * If a signal handler needs to be called,
                         * do_signal() has set R3 to the signal number (the
                         * first argument of the signal handler), so don't
                         * overwrite that with EINTR !
                         * In the other cases, do_signal() doesn't touch
                         * R3, so it's still set to -EINTR (see above).
                         */
                        return regs->gpr[3];
        }
}

int
sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize, int p3, int p4, int p6,
                  int p7, struct pt_regs *regs)
{
        sigset_t saveset, newset;

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

        if (copy_from_user(&newset, unewset, sizeof(newset)))
                return -EFAULT;
        sigdelsetmask(&newset, ~_BLOCKABLE);

        spin_lock_irq(&current->sigmask_lock);
        saveset = current->blocked;
        current->blocked = newset;
        recalc_sigpending(current);
        spin_unlock_irq(&current->sigmask_lock);

        regs->result = -EINTR;
        regs->gpr[3] = EINTR;
        regs->ccr |= 0x10000000;
        while (1) {
                current->state = TASK_INTERRUPTIBLE;
                schedule();
                if (do_signal(&saveset, regs))
                        return regs->gpr[3];
        }
}


int
sys_sigaltstack(const stack_t *uss, stack_t *uoss, int r5, int r6,
                int r7, int r8, struct pt_regs *regs)
{
        return do_sigaltstack(uss, uoss, regs->gpr[1]);
}

int
sys_sigaction(int sig, const struct old_sigaction *act,
              struct old_sigaction *oact)
{
        struct k_sigaction new_ka, old_ka;
        int ret;

        if (act) {
                old_sigset_t mask;
                if (verify_area(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 (verify_area(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;
}

/*
 * When we have signals to deliver, we set up on the
 * user stack, going down from the original stack pointer:
 *      a sigregs struct
 *      a sigcontext struct
 *      a gap of __SIGNAL_FRAMESIZE bytes
 *
 * Each of these things must be a multiple of 16 bytes in size.
 *
 */
struct sigregs {
        struct mcontext mctx;           /* all the register values */
        /* Programs using the rs6000/xcoff abi can save up to 19 gp regs
           and 18 fp regs below sp before decrementing it. */
        int             abigap[56];
};

/* We use the mc_pad field for the signal return trampoline. */
#define tramp   mc_pad

/*
 *  When we have rt signals to deliver, we set up on the
 *  user stack, going down from the original stack pointer:
 *      one rt_sigframe struct (siginfo + ucontext + ABI gap)
 *      a gap of __SIGNAL_FRAMESIZE+16 bytes
 *  (the +16 is to get the siginfo and ucontext in the same
 *  positions as in older kernels).
 *
 *  Each of these things must be a multiple of 16 bytes in size.
 *
 */
struct rt_sigframe
{
        struct siginfo info;
        struct ucontext uc;
        /* Programs using the rs6000/xcoff abi can save up to 19 gp regs
           and 18 fp regs below sp before decrementing it. */
        int             abigap[56];
};

/*
 * Save the current user registers on the user stack.
 * We only save the altivec registers if the process has used
 * altivec instructions at some point.
 */
static int
save_user_regs(struct pt_regs *regs, struct mcontext *frame, int sigret)
{
        /* save general and floating-point registers */
        if (regs->msr & MSR_FP)
                giveup_fpu(current);
        if (__copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE)
            || __copy_to_user(&frame->mc_fregs, current->thread.fpr,
                              ELF_NFPREG * sizeof(double)))
                return 1;

        current->thread.fpscr = 0;      /* turn off all fp exceptions */

#ifdef CONFIG_ALTIVEC
        /* save altivec registers */
        if (current->thread.used_vr) {
                if (regs->msr & MSR_VEC)
                        giveup_altivec(current);
                if (__copy_to_user(&frame->mc_vregs, current->thread.vr,
                                   ELF_NVRREG * sizeof(vector128)))
                        return 1;
                /* set MSR_VEC in the saved MSR value to indicate that
                   frame->mc_vregs contains valid data */
                if (__put_user(regs->msr | MSR_VEC, &frame->mc_gregs[PT_MSR]))
                        return 1;
        }
        /* else assert((regs->msr & MSR_VEC) == 0) */

        /* We always copy to/from vrsave, it's 0 if we don't have or don't
         * use altivec. Since VSCR only contains 32 bits saved in the least
         * significant bits of a vector, we "cheat" and stuff VRSAVE in the
         * most significant bits of that same vector. --BenH
         */
        if (__put_user(current->thread.vrsave, (u32 *)&frame->mc_vregs[32]))
                return 1;
#endif /* CONFIG_ALTIVEC */

        if (sigret) {
                /* Set up the sigreturn trampoline: li r0,sigret; sc */
                if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
                    || __put_user(0x44000002UL, &frame->tramp[1]))
                        return 1;
                flush_icache_range((unsigned long) &frame->tramp[0],
                                   (unsigned long) &frame->tramp[2]);
        }

        return 0;
}

/*
 * Restore the current user register values from the user stack,
 * (except for MSR).
 */
static int
restore_user_regs(struct pt_regs *regs, struct mcontext *sr)
{
#ifdef CONFIG_ALTIVEC
        unsigned long msr;
#endif

        /* copy up to but not including MSR */
        if (__copy_from_user(regs, &sr->mc_gregs, PT_MSR * sizeof(elf_greg_t)))
                return 1;
        /* copy from orig_r3 (the word after the MSR) up to the end */
        if (__copy_from_user(&regs->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3],
                             GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t)))
                return 1;

        /* force the process to reload the FP registers from
           current->thread when it next does FP instructions */
        regs->msr &= ~MSR_FP;
        if (__copy_from_user(current->thread.fpr, &sr->mc_fregs,
                             sizeof(sr->mc_fregs)))
                return 1;

#ifdef CONFIG_ALTIVEC
        /* force the process to reload the altivec registers from
           current->thread when it next does altivec instructions */
        regs->msr &= ~MSR_VEC;
        if (!__get_user(msr, &sr->mc_gregs[PT_MSR]) && (msr & MSR_VEC) != 0) {
                /* restore altivec registers from the stack */
                if (__copy_from_user(current->thread.vr, &sr->mc_vregs,
                                     sizeof(sr->mc_vregs)))
                        return 1;
        } else if (current->thread.used_vr)
                memset(&current->thread.vr, 0, ELF_NVRREG * sizeof(vector128));

        /* Always get VRSAVE back */
        if (__get_user(current->thread.vrsave, (u32 *)&sr->mc_vregs[32]))
                return 1;
#endif /* CONFIG_ALTIVEC */

        return 0;
}

/*
 * Restore the user process's signal mask
 */
static void
restore_sigmask(sigset_t *set)
{
        sigdelsetmask(set, ~_BLOCKABLE);
        spin_lock_irq(&current->sigmask_lock);
        current->blocked = *set;
        recalc_sigpending(current);
        spin_unlock_irq(&current->sigmask_lock);
}

/*
 * Set up a signal frame for a "real-time" signal handler
 * (one which gets siginfo).
 */
static void
handle_rt_signal(unsigned long sig, struct k_sigaction *ka,
                 siginfo_t *info, sigset_t *oldset, struct pt_regs * regs,
                 unsigned long newsp)
{
        struct rt_sigframe *rt_sf;
        struct mcontext *frame;
        unsigned long origsp = newsp;

        /* Set up Signal Frame */
        /* Put a Real Time Context onto stack */
        newsp -= sizeof(*rt_sf);
        rt_sf = (struct rt_sigframe *) newsp;

        /* create a stack frame for the caller of the handler */
        newsp -= __SIGNAL_FRAMESIZE + 16;

        if (verify_area(VERIFY_WRITE, (void *) newsp, origsp - newsp))
                goto badframe;

        /* Put the siginfo & fill in most of the ucontext */
        if (__copy_to_user(&rt_sf->info, info, sizeof(*info))
            || __put_user(0, &rt_sf->uc.uc_flags)
            || __put_user(0, &rt_sf->uc.uc_link)
            || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp)
            || __put_user(sas_ss_flags(regs->gpr[1]), 
                          &rt_sf->uc.uc_stack.ss_flags)
            || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size)
            || __put_user(&rt_sf->uc.uc_mcontext, &rt_sf->uc.uc_regs)
            || __copy_to_user(&rt_sf->uc.uc_sigmask, oldset, sizeof(*oldset)))
                goto badframe;

        /* Save user registers on the stack */
        frame = &rt_sf->uc.uc_mcontext;
        if (save_user_regs(regs, frame, 0x6666))
                goto badframe;

        if (put_user(regs->gpr[1], (unsigned long *)newsp))
                goto badframe;
        regs->gpr[1] = newsp;
        regs->gpr[3] = sig;
        regs->gpr[4] = (unsigned long) &rt_sf->info;
        regs->gpr[5] = (unsigned long) &rt_sf->uc;
        regs->gpr[6] = (unsigned long) rt_sf;
        regs->nip = (unsigned long) ka->sa.sa_handler;
        regs->link = (unsigned long) frame->tramp;

        return;

badframe:
#if DEBUG_SIG
        printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n",
               regs, frame, newsp);
#endif
        if (sig == SIGSEGV)
                ka->sa.sa_handler = SIG_DFL;
        force_sig(SIGSEGV, current);
}

static int do_setcontext(struct ucontext *ucp, struct pt_regs *regs)
{
        sigset_t set;
        struct mcontext *mcp;

        if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(set))
            || __get_user(mcp, &ucp->uc_regs))
                return -EFAULT;
        restore_sigmask(&set);
        if (restore_user_regs(regs, mcp))
                return -EFAULT;

        return 0;
}

int sys_swapcontext(struct ucontext *old_ctx, struct ucontext *new_ctx,
                    int r5, int r6, int r7, int r8, struct pt_regs *regs)
{
        unsigned char tmp;

        if (old_ctx != NULL) {
                if (verify_area(VERIFY_WRITE, old_ctx, sizeof(*old_ctx))
                    || save_user_regs(regs, &old_ctx->uc_mcontext, 0)
                    || __copy_to_user(&old_ctx->uc_sigmask,
                                      &current->blocked, sizeof(sigset_t))
                    || __put_user(&old_ctx->uc_mcontext, &old_ctx->uc_regs))
                        return -EFAULT;
        }
        if (new_ctx == NULL)
                return 0;
        if (verify_area(VERIFY_READ, new_ctx, sizeof(*new_ctx))
            || __get_user(tmp, (u8 *) new_ctx)
            || __get_user(tmp, (u8 *) (new_ctx + 1) - 1))
                return -EFAULT;

        /*
         * If we get a fault copying the context into the kernel's
         * image of the user's registers, we can't just return -EFAULT
         * because the user's registers will be corrupted.  For instance
         * the NIP value may have been updated but not some of the
         * other registers.  Given that we have done the verify_area
         * and successfully read the first and last bytes of the region
         * above, this should only happen in an out-of-memory situation
         * or if another thread unmaps the region containing the context.
         * We kill the task with a SIGSEGV in this situation.
         */
        if (do_setcontext(new_ctx, regs))
                do_exit(SIGSEGV);
        syscall_direct_return(regs);
        /* doesn't actually return back to here */
        return 0;
}

int sys_rt_sigreturn(struct pt_regs *regs)
{
        struct rt_sigframe *rt_sf;
        stack_t st;

        rt_sf = (struct rt_sigframe *)(regs->gpr[1] + __SIGNAL_FRAMESIZE + 16);
        if (verify_area(VERIFY_READ, rt_sf, sizeof(struct rt_sigframe)))
                goto bad;
        if (do_setcontext(&rt_sf->uc, regs))
                goto bad;

        /*
         * It's not clear whether or why it is desirable to save the
         * sigaltstack setting on signal delivery and restore it on
         * signal return.  But other architectures do this and we have
         * always done it up until now so it is probably better not to
         * change it.  -- paulus
         */
        if (__copy_from_user(&st, &rt_sf->uc.uc_stack, sizeof(st)))
                goto bad;
        do_sigaltstack(&st, NULL, regs->gpr[1]);

        return regs->result;

 bad:
        force_sig(SIGSEGV, current);
        return 0;
}

/*
 * OK, we're invoking a handler
 */
static void
handle_signal(unsigned long sig, struct k_sigaction *ka,
              siginfo_t *info, sigset_t *oldset, struct pt_regs * regs,
              unsigned long newsp)
{
        struct sigcontext *sc;
        struct sigregs *frame;
        unsigned long origsp = newsp;

        /* Set up Signal Frame */
        newsp -= sizeof(struct sigregs);
        frame = (struct sigregs *) newsp;

        /* Put a sigcontext on the stack */
        newsp -= sizeof(*sc);
        sc = (struct sigcontext *) newsp;

        /* create a stack frame for the caller of the handler */
        newsp -= __SIGNAL_FRAMESIZE;

        if (verify_area(VERIFY_WRITE, (void *) newsp, origsp - newsp))
                goto badframe;

#if _NSIG != 64
#error "Please adjust handle_signal()"
#endif
        if (__put_user((unsigned long) ka->sa.sa_handler, &sc->handler)
            || __put_user(oldset->sig[0], &sc->oldmask)
            || __put_user(oldset->sig[1], &sc->_unused[3])
            || __put_user((struct pt_regs *)frame, &sc->regs)
            || __put_user(sig, &sc->signal))
                goto badframe;

        if (save_user_regs(regs, &frame->mctx, 0x7777))
                goto badframe;

        if (put_user(regs->gpr[1], (unsigned long *)newsp))
                goto badframe;
        regs->gpr[1] = newsp;
        regs->gpr[3] = sig;
        regs->gpr[4] = (unsigned long) sc;
        regs->nip = (unsigned long) ka->sa.sa_handler;
        regs->link = (unsigned long) frame->mctx.tramp;

        return;

badframe:
#if DEBUG_SIG
        printk("badframe in handle_signal, regs=%p frame=%lx newsp=%lx\n",
               regs, frame, *newspp);
#endif
        if (sig == SIGSEGV)
                ka->sa.sa_handler = SIG_DFL;
        force_sig(SIGSEGV, current);
}

/*
 * Do a signal return; undo the signal stack.
 */
int sys_sigreturn(struct pt_regs *regs)
{
        struct sigcontext *sc, sigctx;
        struct mcontext *sr;
        int ret;
        sigset_t set;

        sc = (struct sigcontext *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
        if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
                goto badframe;

        set.sig[0] = sigctx.oldmask;
        set.sig[1] = sigctx._unused[3];
        restore_sigmask(&set);

        sr = (struct mcontext *) sigctx.regs;
        if (verify_area(VERIFY_READ, sr, sizeof(*sr))
            || restore_user_regs(regs, sr))
                goto badframe;

        ret = regs->result;

        return ret;

badframe:
        force_sig(SIGSEGV, current);
        return 0;
}       

static int get_signal_to_deliver(struct siginfo *infop, struct pt_regs *regs)
{
        struct k_sigaction *ka;
        int signr;

        for (;;) {
                spin_lock_irq(&current->sigmask_lock);
                signr = dequeue_signal(&current->blocked, infop);
                spin_unlock_irq(&current->sigmask_lock);

                if (!signr)
                        return 0;

                if ((current->ptrace & PT_PTRACED) && signr != SIGKILL) {
                        /* Let the debugger run.  */
                        current->exit_code = signr;
                        current->state = TASK_STOPPED;
                        notify_parent(current, SIGCHLD);
                        schedule();

                        /* We're back.  Did the debugger cancel the sig?  */
                        if (!(signr = current->exit_code))
                                continue;
                        current->exit_code = 0;

                        /* The debugger continued.  Ignore SIGSTOP.  */
                        if (signr == SIGSTOP)
                                continue;

                        /* Update the siginfo structure.  Is this good?  */
                        if (signr != infop->si_signo) {
                                infop->si_signo = signr;
                                infop->si_errno = 0;
                                infop->si_code = SI_USER;
                                infop->si_pid = current->p_pptr->pid;
                                infop->si_uid = current->p_pptr->uid;
                        }

                        /* If the (new) signal is now blocked, requeue it.  */
                        if (sigismember(&current->blocked, signr)) {
                                send_sig_info(signr, infop, current);
                                continue;
                        }
                }

                ka = &current->sig->action[signr-1];
                if (ka->sa.sa_handler == SIG_IGN) {
                        if (signr != SIGCHLD)
                                continue;
                        /* Check for SIGCHLD: it's special.  */
                        while (sys_wait4(-1, NULL, WNOHANG, NULL) > 0)
                                /* nothing */;
                        continue;
                }

                if (ka->sa.sa_handler == SIG_DFL) {
                        int exit_code = signr;

                        /* Init gets no signals it doesn't want.  */
                        if (current->pid == 1)
                                continue;

                        switch (signr) {
                        case SIGCONT: case SIGCHLD: case SIGWINCH: case SIGURG:
                                continue;

                        case SIGTSTP: case SIGTTIN: case SIGTTOU:
                                if (is_orphaned_pgrp(current->pgrp))
                                        continue;
                                /* FALLTHRU */

                        case SIGSTOP:
                                current->state = TASK_STOPPED;
                                current->exit_code = signr;
                                if (!(current->p_pptr->sig->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDSTOP))
                                        notify_parent(current, SIGCHLD);
                                schedule();
                                continue;

                        case SIGQUIT: case SIGILL: case SIGTRAP:
                        case SIGABRT: case SIGFPE: case SIGSEGV:
                        case SIGBUS: case SIGSYS: case SIGXCPU: case SIGXFSZ:
                                if (do_coredump(signr, regs))
                                        exit_code |= 0x80;
                                /* FALLTHRU */

                        default:
                                sig_exit(signr, exit_code, infop);
                                /* NOTREACHED */
                        }
                }
                return signr;
        }
}

/*
 * 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.
 */
int do_signal(sigset_t *oldset, struct pt_regs *regs)
{
        siginfo_t info;
        struct k_sigaction *ka;
        unsigned long frame, newsp;
        int signr;

        if (!oldset)
                oldset = &current->blocked;

        newsp = frame = 0;

        signr = get_signal_to_deliver(&info, regs);

        ka = (signr == 0)? NULL: &current->sig->action[signr-1];

        if (regs->trap == 0xc00) {              /* system call */
                switch ((int) regs->result) {
                case -ERESTARTSYS:
                        if (signr == 0 || (ka->sa.sa_flags & SA_RESTART))
                                goto retry;
                        /* fall through */
                case -ERESTARTNOHAND:
                        if (signr > 0) {
                                /* make the system call return an EINTR */
                                regs->result = -EINTR;
                                break;
                        }
                        /* fall through */
                case -ERESTARTNOINTR:
                retry:
                        /* Back up & retry system call */
                        regs->gpr[3] = regs->orig_gpr3;
                        regs->nip -= 4;
                        regs->result = 0;
                        break;
                }
        }

        if (signr == 0)
                return 0;               /* no signals delivered */

        if ((ka->sa.sa_flags & SA_ONSTACK) && current->sas_ss_size
            && !on_sig_stack(regs->gpr[1]))
                newsp = current->sas_ss_sp + current->sas_ss_size;
        else
                newsp = regs->gpr[1];
        newsp &= ~0xfUL;

        /* Whee!  Actually deliver the signal.  */
        if (ka->sa.sa_flags & SA_SIGINFO)
                handle_rt_signal(signr, ka, &info, oldset, regs, newsp);
        else
                handle_signal(signr, ka, &info, oldset, regs, newsp);

        if (ka->sa.sa_flags & SA_ONESHOT)
                ka->sa.sa_handler = SIG_DFL;

        if (!(ka->sa.sa_flags & SA_NODEFER)) {
                spin_lock_irq(&current->sigmask_lock);
                sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
                sigaddset(&current->blocked, signr);
                recalc_sigpending(current);
                spin_unlock_irq(&current->sigmask_lock);
        }

        return 1;
}