/*
 * IA32 Architecture-specific signal handling support.
 *
 * Copyright (C) 1999, 2001-2002, 2005 Hewlett-Packard Co
 *      David Mosberger-Tang <davidm@hpl.hp.com>
 * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
 * Copyright (C) 2000 VA Linux Co
 * Copyright (C) 2000 Don Dugger <n0ano@valinux.com>
 *
 * Derived from i386 and Alpha versions.
 */

#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/personality.h>
#include <linux/ptrace.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/smp.h>
#include <linux/stddef.h>
#include <linux/syscalls.h>
#include <linux/unistd.h>
#include <linux/wait.h>
#include <linux/compat.h>

#include <asm/intrinsics.h>
#include <asm/uaccess.h>
#include <asm/rse.h>
#include <asm/sigcontext.h>

#include "ia32priv.h"

#include "../kernel/sigframe.h"

#define A(__x)          ((unsigned long)(__x))

#define DEBUG_SIG       0
#define _BLOCKABLE      (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))

#define __IA32_NR_sigreturn            119
#define __IA32_NR_rt_sigreturn         173

struct sigframe_ia32
{
       int pretcode;
       int sig;
       struct sigcontext_ia32 sc;
       struct _fpstate_ia32 fpstate;
       unsigned int extramask[_COMPAT_NSIG_WORDS-1];
       char retcode[8];
};

struct rt_sigframe_ia32
{
       int pretcode;
       int sig;
       int pinfo;
       int puc;
       compat_siginfo_t info;
       struct ucontext_ia32 uc;
       struct _fpstate_ia32 fpstate;
       char retcode[8];
};

int
copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from)
{
        unsigned long tmp;
        int err;

        if (!access_ok(VERIFY_READ, from, sizeof(compat_siginfo_t)))
                return -EFAULT;

        err = __get_user(to->si_signo, &from->si_signo);
        err |= __get_user(to->si_errno, &from->si_errno);
        err |= __get_user(to->si_code, &from->si_code);

        if (to->si_code < 0)
                err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
        else {
                switch (to->si_code >> 16) {
                      case __SI_CHLD >> 16:
                        err |= __get_user(to->si_utime, &from->si_utime);
                        err |= __get_user(to->si_stime, &from->si_stime);
                        err |= __get_user(to->si_status, &from->si_status);
                      default:
                        err |= __get_user(to->si_pid, &from->si_pid);
                        err |= __get_user(to->si_uid, &from->si_uid);
                        break;
                      case __SI_FAULT >> 16:
                        err |= __get_user(tmp, &from->si_addr);
                        to->si_addr = (void __user *) tmp;
                        break;
                      case __SI_POLL >> 16:
                        err |= __get_user(to->si_band, &from->si_band);
                        err |= __get_user(to->si_fd, &from->si_fd);
                        break;
                      case __SI_RT >> 16: /* This is not generated by the kernel as of now.  */
                      case __SI_MESGQ >> 16:
                        err |= __get_user(to->si_pid, &from->si_pid);
                        err |= __get_user(to->si_uid, &from->si_uid);
                        err |= __get_user(to->si_int, &from->si_int);
                        break;
                }
        }
        return err;
}

int
copy_siginfo_to_user32 (compat_siginfo_t __user *to, siginfo_t *from)
{
        unsigned int addr;
        int err;

        if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
                return -EFAULT;

        /* 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.
           This routine must convert siginfo from 64bit to 32bit as well
           at the same time.  */
        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);
        if (from->si_code < 0)
                err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
        else {
                switch (from->si_code >> 16) {
                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_pid, &to->si_pid);
                        err |= __put_user(from->si_uid, &to->si_uid);
                        break;
                case __SI_FAULT >> 16:
                        /* avoid type-checking warnings by copying _pad[0] in lieu of si_addr... */
                        err |= __put_user(from->_sifields._pad[0], &to->si_addr);
                        break;
                case __SI_POLL >> 16:
                        err |= __put_user(from->si_band, &to->si_band);
                        err |= __put_user(from->si_fd, &to->si_fd);
                        break;
                case __SI_TIMER >> 16:
                        err |= __put_user(from->si_tid, &to->si_tid);
                        err |= __put_user(from->si_overrun, &to->si_overrun);
                        addr = (unsigned long) from->si_ptr;
                        err |= __put_user(addr, &to->si_ptr);
                        break;
                case __SI_RT >> 16:     /* Not generated by the kernel as of now.  */
                case __SI_MESGQ >> 16:
                        err |= __put_user(from->si_uid, &to->si_uid);
                        err |= __put_user(from->si_pid, &to->si_pid);
                        addr = (unsigned long) from->si_ptr;
                        err |= __put_user(addr, &to->si_ptr);
                        break;
                }
        }
        return err;
}


/*
 *  SAVE and RESTORE of ia32 fpstate info, from ia64 current state
 *  Used in exception handler to pass the fpstate to the user, and restore
 *  the fpstate while returning from the exception handler.
 *
 *    fpstate info and their mapping to IA64 regs:
 *    fpstate    REG(BITS)      Attribute    Comments
 *    cw         ar.fcr(0:12)                with bits 7 and 6 not used
 *    sw         ar.fsr(0:15)
 *    tag        ar.fsr(16:31)               with odd numbered bits not used
 *                                           (read returns 0, writes ignored)
 *    ipoff      ar.fir(0:31)
 *    cssel      ar.fir(32:47)
 *    dataoff    ar.fdr(0:31)
 *    datasel    ar.fdr(32:47)
 *
 *    _st[(0+TOS)%8]   f8
 *    _st[(1+TOS)%8]   f9
 *    _st[(2+TOS)%8]   f10
 *    _st[(3+TOS)%8]   f11                   (f8..f11 from ptregs)
 *      : :            :                     (f12..f15 from live reg)
 *      : :            :
 *    _st[(7+TOS)%8]   f15                   TOS=sw.top(bits11:13)
 *
 *    status     Same as sw     RO
 *    magic      0                           as X86_FXSR_MAGIC in ia32
 *    mxcsr      Bits(7:15)=ar.fcr(39:47)
 *               Bits(0:5) =ar.fsr(32:37)    with bit 6 reserved
 *    _xmm[0..7] f16..f31                    (live registers)
 *                                           with _xmm[0]
 *                                             Bit(64:127)=f17(0:63)
 *                                             Bit(0:63)=f16(0:63)
 *    All other fields unused...
 */

static int
save_ia32_fpstate_live (struct _fpstate_ia32 __user *save)
{
        struct task_struct *tsk = current;
        struct pt_regs *ptp;
        struct _fpreg_ia32 *fpregp;
        char buf[32];
        unsigned long fsr, fcr, fir, fdr;
        unsigned long new_fsr;
        unsigned long num128[2];
        unsigned long mxcsr=0;
        int fp_tos, fr8_st_map;

        if (!access_ok(VERIFY_WRITE, save, sizeof(*save)))
                return -EFAULT;

        /* Read in fsr, fcr, fir, fdr and copy onto fpstate */
        fsr = ia64_getreg(_IA64_REG_AR_FSR);
        fcr = ia64_getreg(_IA64_REG_AR_FCR);
        fir = ia64_getreg(_IA64_REG_AR_FIR);
        fdr = ia64_getreg(_IA64_REG_AR_FDR);

        /*
         * We need to clear the exception state before calling the signal handler. Clear
         * the bits 15, bits 0-7 in fp status word. Similar to the functionality of fnclex
         * instruction.
         */
        new_fsr = fsr & ~0x80ff;
        ia64_setreg(_IA64_REG_AR_FSR, new_fsr);

        __put_user(fcr & 0xffff, &save->cw);
        __put_user(fsr & 0xffff, &save->sw);
        __put_user((fsr>>16) & 0xffff, &save->tag);
        __put_user(fir, &save->ipoff);
        __put_user((fir>>32) & 0xffff, &save->cssel);
        __put_user(fdr, &save->dataoff);
        __put_user((fdr>>32) & 0xffff, &save->datasel);
        __put_user(fsr & 0xffff, &save->status);

        mxcsr = ((fcr>>32) & 0xff80) | ((fsr>>32) & 0x3f);
        __put_user(mxcsr & 0xffff, &save->mxcsr);
        __put_user( 0, &save->magic); //#define X86_FXSR_MAGIC   0x0000

        /*
         * save f8..f11  from pt_regs
         * save f12..f15 from live register set
         */
        /*
         *  Find the location where f8 has to go in fp reg stack.  This depends on
         *  TOP(11:13) field of sw. Other f reg continue sequentially from where f8 maps
         *  to.
         */
        fp_tos = (fsr>>11)&0x7;
        fr8_st_map = (8-fp_tos)&0x7;
        ptp = task_pt_regs(tsk);
        fpregp = (struct _fpreg_ia32 *)(((unsigned long)buf + 15) & ~15);
        ia64f2ia32f(fpregp, &ptp->f8);
        copy_to_user(&save->_st[(0+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));
        ia64f2ia32f(fpregp, &ptp->f9);
        copy_to_user(&save->_st[(1+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));
        ia64f2ia32f(fpregp, &ptp->f10);
        copy_to_user(&save->_st[(2+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));
        ia64f2ia32f(fpregp, &ptp->f11);
        copy_to_user(&save->_st[(3+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));

        ia64_stfe(fpregp, 12);
        copy_to_user(&save->_st[(4+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));
        ia64_stfe(fpregp, 13);
        copy_to_user(&save->_st[(5+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));
        ia64_stfe(fpregp, 14);
        copy_to_user(&save->_st[(6+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));
        ia64_stfe(fpregp, 15);
        copy_to_user(&save->_st[(7+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32));

        ia64_stf8(&num128[0], 16);
        ia64_stf8(&num128[1], 17);
        copy_to_user(&save->_xmm[0], num128, sizeof(struct _xmmreg_ia32));

        ia64_stf8(&num128[0], 18);
        ia64_stf8(&num128[1], 19);
        copy_to_user(&save->_xmm[1], num128, sizeof(struct _xmmreg_ia32));

        ia64_stf8(&num128[0], 20);
        ia64_stf8(&num128[1], 21);
        copy_to_user(&save->_xmm[2], num128, sizeof(struct _xmmreg_ia32));

        ia64_stf8(&num128[0], 22);
        ia64_stf8(&num128[1], 23);
        copy_to_user(&save->_xmm[3], num128, sizeof(struct _xmmreg_ia32));

        ia64_stf8(&num128[0], 24);
        ia64_stf8(&num128[1], 25);
        copy_to_user(&save->_xmm[4], num128, sizeof(struct _xmmreg_ia32));

        ia64_stf8(&num128[0], 26);
        ia64_stf8(&num128[1], 27);
        copy_to_user(&save->_xmm[5], num128, sizeof(struct _xmmreg_ia32));

        ia64_stf8(&num128[0], 28);
        ia64_stf8(&num128[1], 29);
        copy_to_user(&save->_xmm[6], num128, sizeof(struct _xmmreg_ia32));

        ia64_stf8(&num128[0], 30);
        ia64_stf8(&num128[1], 31);
        copy_to_user(&save->_xmm[7], num128, sizeof(struct _xmmreg_ia32));
        return 0;
}

static int
restore_ia32_fpstate_live (struct _fpstate_ia32 __user *save)
{
        struct task_struct *tsk = current;
        struct pt_regs *ptp;
        unsigned int lo, hi;
        unsigned long num128[2];
        unsigned long num64, mxcsr;
        struct _fpreg_ia32 *fpregp;
        char buf[32];
        unsigned long fsr, fcr, fir, fdr;
        int fp_tos, fr8_st_map;

        if (!access_ok(VERIFY_READ, save, sizeof(*save)))
                return(-EFAULT);

        /*
         * Updating fsr, fcr, fir, fdr.
         * Just a bit more complicated than save.
         * - Need to make sure that we don't write any value other than the
         *   specific fpstate info
         * - Need to make sure that the untouched part of frs, fdr, fir, fcr
         *   should remain same while writing.
         * So, we do a read, change specific fields and write.
         */
        fsr = ia64_getreg(_IA64_REG_AR_FSR);
        fcr = ia64_getreg(_IA64_REG_AR_FCR);
        fir = ia64_getreg(_IA64_REG_AR_FIR);
        fdr = ia64_getreg(_IA64_REG_AR_FDR);

        __get_user(mxcsr, (unsigned int __user *)&save->mxcsr);
        /* setting bits 0..5 8..12 with cw and 39..47 from mxcsr */
        __get_user(lo, (unsigned int __user *)&save->cw);
        num64 = mxcsr & 0xff10;
        num64 = (num64 << 32) | (lo & 0x1f3f);
        fcr = (fcr & (~0xff1000001f3fUL)) | num64;

        /* setting bits 0..31 with sw and tag and 32..37 from mxcsr */
        __get_user(lo, (unsigned int __user *)&save->sw);
        /* set bits 15,7 (fsw.b, fsw.es) to reflect the current error status */
        if ( !(lo & 0x7f) )
                lo &= (~0x8080);
        __get_user(hi, (unsigned int __user *)&save->tag);
        num64 = mxcsr & 0x3f;
        num64 = (num64 << 16) | (hi & 0xffff);
        num64 = (num64 << 16) | (lo & 0xffff);
        fsr = (fsr & (~0x3fffffffffUL)) | num64;

        /* setting bits 0..47 with cssel and ipoff */
        __get_user(lo, (unsigned int __user *)&save->ipoff);
        __get_user(hi, (unsigned int __user *)&save->cssel);
        num64 = hi & 0xffff;
        num64 = (num64 << 32) | lo;
        fir = (fir & (~0xffffffffffffUL)) | num64;

        /* setting bits 0..47 with datasel and dataoff */
        __get_user(lo, (unsigned int __user *)&save->dataoff);
        __get_user(hi, (unsigned int __user *)&save->datasel);
        num64 = hi & 0xffff;
        num64 = (num64 << 32) | lo;
        fdr = (fdr & (~0xffffffffffffUL)) | num64;

        ia64_setreg(_IA64_REG_AR_FSR, fsr);
        ia64_setreg(_IA64_REG_AR_FCR, fcr);
        ia64_setreg(_IA64_REG_AR_FIR, fir);
        ia64_setreg(_IA64_REG_AR_FDR, fdr);

        /*
         * restore f8..f11 onto pt_regs
         * restore f12..f15 onto live registers
         */
        /*
         *  Find the location where f8 has to go in fp reg stack.  This depends on
         *  TOP(11:13) field of sw. Other f reg continue sequentially from where f8 maps
         *  to.
         */
        fp_tos = (fsr>>11)&0x7;
        fr8_st_map = (8-fp_tos)&0x7;
        fpregp = (struct _fpreg_ia32 *)(((unsigned long)buf + 15) & ~15);

        ptp = task_pt_regs(tsk);
        copy_from_user(fpregp, &save->_st[(0+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
        ia32f2ia64f(&ptp->f8, fpregp);
        copy_from_user(fpregp, &save->_st[(1+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
        ia32f2ia64f(&ptp->f9, fpregp);
        copy_from_user(fpregp, &save->_st[(2+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
        ia32f2ia64f(&ptp->f10, fpregp);
        copy_from_user(fpregp, &save->_st[(3+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
        ia32f2ia64f(&ptp->f11, fpregp);

        copy_from_user(fpregp, &save->_st[(4+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
        ia64_ldfe(12, fpregp);
        copy_from_user(fpregp, &save->_st[(5+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
        ia64_ldfe(13, fpregp);
        copy_from_user(fpregp, &save->_st[(6+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
        ia64_ldfe(14, fpregp);
        copy_from_user(fpregp, &save->_st[(7+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32));
        ia64_ldfe(15, fpregp);

        copy_from_user(num128, &save->_xmm[0], sizeof(struct _xmmreg_ia32));
        ia64_ldf8(16, &num128[0]);
        ia64_ldf8(17, &num128[1]);

        copy_from_user(num128, &save->_xmm[1], sizeof(struct _xmmreg_ia32));
        ia64_ldf8(18, &num128[0]);
        ia64_ldf8(19, &num128[1]);

        copy_from_user(num128, &save->_xmm[2], sizeof(struct _xmmreg_ia32));
        ia64_ldf8(20, &num128[0]);
        ia64_ldf8(21, &num128[1]);

        copy_from_user(num128, &save->_xmm[3], sizeof(struct _xmmreg_ia32));
        ia64_ldf8(22, &num128[0]);
        ia64_ldf8(23, &num128[1]);

        copy_from_user(num128, &save->_xmm[4], sizeof(struct _xmmreg_ia32));
        ia64_ldf8(24, &num128[0]);
        ia64_ldf8(25, &num128[1]);

        copy_from_user(num128, &save->_xmm[5], sizeof(struct _xmmreg_ia32));
        ia64_ldf8(26, &num128[0]);
        ia64_ldf8(27, &num128[1]);

        copy_from_user(num128, &save->_xmm[6], sizeof(struct _xmmreg_ia32));
        ia64_ldf8(28, &num128[0]);
        ia64_ldf8(29, &num128[1]);

        copy_from_user(num128, &save->_xmm[7], sizeof(struct _xmmreg_ia32));
        ia64_ldf8(30, &num128[0]);
        ia64_ldf8(31, &num128[1]);
        return 0;
}

static inline void
sigact_set_handler (struct k_sigaction *sa, unsigned int handler, unsigned int restorer)
{
        if (handler + 1 <= 2)
                /* SIG_DFL, SIG_IGN, or SIG_ERR: must sign-extend to 64-bits */
                sa->sa.sa_handler = (__sighandler_t) A((int) handler);
        else
                sa->sa.sa_handler = (__sighandler_t) (((unsigned long) restorer << 32) | handler);
}

asmlinkage long
sys32_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_restore_sigmask();
        return -ERESTARTNOHAND;
}

asmlinkage long
sys32_signal (int sig, unsigned int handler)
{
        struct k_sigaction new_sa, old_sa;
        int ret;

        sigact_set_handler(&new_sa, handler, 0);
        new_sa.sa.sa_flags = SA_ONESHOT | SA_NOMASK;
        sigemptyset(&new_sa.sa.sa_mask);

        ret = do_sigaction(sig, &new_sa, &old_sa);

        return ret ? ret : IA32_SA_HANDLER(&old_sa);
}

asmlinkage long
sys32_rt_sigaction (int sig, struct sigaction32 __user *act,
                    struct sigaction32 __user *oact, unsigned int sigsetsize)
{
        struct k_sigaction new_ka, old_ka;
        unsigned int handler, restorer;
        int ret;

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

        if (act) {
                ret = get_user(handler, &act->sa_handler);
                ret |= get_user(new_ka.sa.sa_flags, &act->sa_flags);
                ret |= get_user(restorer, &act->sa_restorer);
                ret |= copy_from_user(&new_ka.sa.sa_mask, &act->sa_mask, sizeof(compat_sigset_t));
                if (ret)
                        return -EFAULT;

                sigact_set_handler(&new_ka, handler, restorer);
        }

        ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

        if (!ret && oact) {
                ret = put_user(IA32_SA_HANDLER(&old_ka), &oact->sa_handler);
                ret |= put_user(old_ka.sa.sa_flags, &oact->sa_flags);
                ret |= put_user(IA32_SA_RESTORER(&old_ka), &oact->sa_restorer);
                ret |= copy_to_user(&oact->sa_mask, &old_ka.sa.sa_mask, sizeof(compat_sigset_t));
        }
        return ret;
}


asmlinkage long
sys32_rt_sigprocmask (int how, compat_sigset_t __user *set, compat_sigset_t __user *oset,
                      unsigned int sigsetsize)
{
        mm_segment_t old_fs = get_fs();
        sigset_t s;
        long ret;

        if (sigsetsize > sizeof(s))
                return -EINVAL;

        if (set) {
                memset(&s, 0, sizeof(s));
                if (copy_from_user(&s.sig, set, sigsetsize))
                        return -EFAULT;
        }
        set_fs(KERNEL_DS);
        ret = sys_rt_sigprocmask(how,
                                 set ? (sigset_t __user *) &s : NULL,
                                 oset ? (sigset_t __user *) &s : NULL, sizeof(s));
        set_fs(old_fs);
        if (ret)
                return ret;
        if (oset) {
                if (copy_to_user(oset, &s.sig, sigsetsize))
                        return -EFAULT;
        }
        return 0;
}

asmlinkage long
sys32_rt_sigqueueinfo (int pid, int sig, compat_siginfo_t __user *uinfo)
{
        mm_segment_t old_fs = get_fs();
        siginfo_t info;
        int ret;

        if (copy_siginfo_from_user32(&info, uinfo))
                return -EFAULT;
        set_fs(KERNEL_DS);
        ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *) &info);
        set_fs(old_fs);
        return ret;
}

asmlinkage long
sys32_sigaction (int sig, struct old_sigaction32 __user *act, struct old_sigaction32 __user *oact)
{
        struct k_sigaction new_ka, old_ka;
        unsigned int handler, restorer;
        int ret;

        if (act) {
                compat_old_sigset_t mask;

                ret = get_user(handler, &act->sa_handler);
                ret |= get_user(new_ka.sa.sa_flags, &act->sa_flags);
                ret |= get_user(restorer, &act->sa_restorer);
                ret |= get_user(mask, &act->sa_mask);
                if (ret)
                        return ret;

                sigact_set_handler(&new_ka, handler, restorer);
                siginitset(&new_ka.sa.sa_mask, mask);
        }

        ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

        if (!ret && oact) {
                ret = put_user(IA32_SA_HANDLER(&old_ka), &oact->sa_handler);
                ret |= put_user(old_ka.sa.sa_flags, &oact->sa_flags);
                ret |= put_user(IA32_SA_RESTORER(&old_ka), &oact->sa_restorer);
                ret |= put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
        }

        return ret;
}

static int
setup_sigcontext_ia32 (struct sigcontext_ia32 __user *sc, struct _fpstate_ia32 __user *fpstate,
                       struct pt_regs *regs, unsigned long mask)
{
        int  err = 0;
        unsigned long flag;

        if (!access_ok(VERIFY_WRITE, sc, sizeof(*sc)))
                return -EFAULT;

        err |= __put_user((regs->r16 >> 32) & 0xffff, (unsigned int __user *)&sc->fs);
        err |= __put_user((regs->r16 >> 48) & 0xffff, (unsigned int __user *)&sc->gs);
        err |= __put_user((regs->r16 >> 16) & 0xffff, (unsigned int __user *)&sc->es);
        err |= __put_user(regs->r16 & 0xffff, (unsigned int __user *)&sc->ds);
        err |= __put_user(regs->r15, &sc->edi);
        err |= __put_user(regs->r14, &sc->esi);
        err |= __put_user(regs->r13, &sc->ebp);
        err |= __put_user(regs->r12, &sc->esp);
        err |= __put_user(regs->r11, &sc->ebx);
        err |= __put_user(regs->r10, &sc->edx);
        err |= __put_user(regs->r9, &sc->ecx);
        err |= __put_user(regs->r8, &sc->eax);
#if 0
        err |= __put_user(current->tss.trap_no, &sc->trapno);
        err |= __put_user(current->tss.error_code, &sc->err);
#endif
        err |= __put_user(regs->cr_iip, &sc->eip);
        err |= __put_user(regs->r17 & 0xffff, (unsigned int __user *)&sc->cs);
        /*
         *  `eflags' is in an ar register for this context
         */
        flag = ia64_getreg(_IA64_REG_AR_EFLAG);
        err |= __put_user((unsigned int)flag, &sc->eflags);
        err |= __put_user(regs->r12, &sc->esp_at_signal);
        err |= __put_user((regs->r17 >> 16) & 0xffff, (unsigned int __user *)&sc->ss);

        if ( save_ia32_fpstate_live(fpstate) < 0 )
                err = -EFAULT;
        else
                err |= __put_user((u32)(u64)fpstate, &sc->fpstate);

#if 0
        tmp = save_i387(fpstate);
        if (tmp < 0)
                err = 1;
        else
                err |= __put_user(tmp ? fpstate : NULL, &sc->fpstate);

        /* non-iBCS2 extensions.. */
#endif
        err |= __put_user(mask, &sc->oldmask);
#if 0
        err |= __put_user(current->tss.cr2, &sc->cr2);
#endif
        return err;
}

static int
restore_sigcontext_ia32 (struct pt_regs *regs, struct sigcontext_ia32 __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;

        if (!access_ok(VERIFY_READ, sc, sizeof(*sc)))
                return(-EFAULT);

#define COPY(ia64x, ia32x)      err |= __get_user(regs->ia64x, &sc->ia32x)

#define copyseg_gs(tmp)         (regs->r16 |= (unsigned long) (tmp) << 48)
#define copyseg_fs(tmp)         (regs->r16 |= (unsigned long) (tmp) << 32)
#define copyseg_cs(tmp)         (regs->r17 |= tmp)
#define copyseg_ss(tmp)         (regs->r17 |= (unsigned long) (tmp) << 16)
#define copyseg_es(tmp)         (regs->r16 |= (unsigned long) (tmp) << 16)
#define copyseg_ds(tmp)         (regs->r16 |= tmp)

#define COPY_SEG(seg)                                   \
        {                                               \
                unsigned short tmp;                     \
                err |= __get_user(tmp, &sc->seg);       \
                copyseg_##seg(tmp);                     \
        }
#define COPY_SEG_STRICT(seg)                            \
        {                                               \
                unsigned short tmp;                     \
                err |= __get_user(tmp, &sc->seg);       \
                copyseg_##seg(tmp|3);                   \
        }

        /* To make COPY_SEGs easier, we zero r16, r17 */
        regs->r16 = 0;
        regs->r17 = 0;

        COPY_SEG(gs);
        COPY_SEG(fs);
        COPY_SEG(es);
        COPY_SEG(ds);
        COPY(r15, edi);
        COPY(r14, esi);
        COPY(r13, ebp);
        COPY(r12, esp);
        COPY(r11, ebx);
        COPY(r10, edx);
        COPY(r9, ecx);
        COPY(cr_iip, eip);
        COPY_SEG_STRICT(cs);
        COPY_SEG_STRICT(ss);
        ia32_load_segment_descriptors(current);
        {
                unsigned int tmpflags;
                unsigned long flag;

                /*
                 *  IA32 `eflags' is not part of `pt_regs', it's in an ar register which
                 *  is part of the thread context.  Fortunately, we are executing in the
                 *  IA32 process's context.
                 */
                err |= __get_user(tmpflags, &sc->eflags);
                flag = ia64_getreg(_IA64_REG_AR_EFLAG);
                flag &= ~0x40DD5;
                flag |= (tmpflags & 0x40DD5);
                ia64_setreg(_IA64_REG_AR_EFLAG, flag);

                regs->r1 = -1;  /* disable syscall checks, r1 is orig_eax */
        }

        {
                struct _fpstate_ia32 __user *buf = NULL;
                u32    fpstate_ptr;
                err |= get_user(fpstate_ptr, &(sc->fpstate));
                buf = compat_ptr(fpstate_ptr);
                if (buf) {
                        err |= restore_ia32_fpstate_live(buf);
                }
        }

#if 0
        {
                struct _fpstate * buf;
                err |= __get_user(buf, &sc->fpstate);
                if (buf) {
                        if (!access_ok(VERIFY_READ, buf, sizeof(*buf)))
                                goto badframe;
                        err |= restore_i387(buf);
                }
        }
#endif

        err |= __get_user(*peax, &sc->eax);
        return err;

#if 0
  badframe:
        return 1;
#endif
}

/*
 * 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 (truncate off sign-extension of bit 31: */
        esp = (unsigned int) regs->r12;

        /* This is the X/Open sanctioned signal stack switching.  */
        if (ka->sa.sa_flags & SA_ONSTACK) {
                int onstack = sas_ss_flags(esp);

                if (onstack == 0)
                        esp = current->sas_ss_sp + current->sas_ss_size;
                else if (onstack == SS_ONSTACK) {
                        /*
                         * If we are on the alternate signal stack and would
                         * overflow it, don't. Return an always-bogus address
                         * instead so we will die with SIGSEGV.
                         */
                        if (!likely(on_sig_stack(esp - frame_size)))
                                return (void __user *) -1L;
                }
        }
        /* Legacy stack switching not supported */

        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;
}

static int
setup_frame_ia32 (int sig, struct k_sigaction *ka, sigset_t *set, struct pt_regs * regs)
{
        struct exec_domain *ed = current_thread_info()->exec_domain;
        struct sigframe_ia32 __user *frame;
        int err = 0;

        frame = get_sigframe(ka, regs, sizeof(*frame));

        if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
                goto give_sigsegv;

        err |= __put_user((ed && ed->signal_invmap && sig < 32
                           ? (int)(ed->signal_invmap[sig]) : sig), &frame->sig);

        err |= setup_sigcontext_ia32(&frame->sc, &frame->fpstate, regs, set->sig[0]);

        if (_COMPAT_NSIG_WORDS > 1)
                err |= __copy_to_user(frame->extramask, (char *) &set->sig + 4,
                                      sizeof(frame->extramask));

        /* Set up to return from userspace.  If provided, use a stub
           already in userspace.  */
        if (ka->sa.sa_flags & SA_RESTORER) {
                unsigned int restorer = IA32_SA_RESTORER(ka);
                err |= __put_user(restorer, &frame->pretcode);
        } else {
                /* Pointing to restorer in ia32 gate page */
                err |= __put_user(IA32_GATE_OFFSET, &frame->pretcode);
        }

        /* This is popl %eax ; movl $,%eax ; int $0x80
         * and there for historical reasons only.
         * See arch/i386/kernel/signal.c
         */

        err |= __put_user(0xb858, (short __user *)(frame->retcode+0));
        err |= __put_user(__IA32_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->r12 = (unsigned long) frame;
        regs->cr_iip = IA32_SA_HANDLER(ka);

        set_fs(USER_DS);

#if 0
        regs->eflags &= ~TF_MASK;
#endif

#if 0
        printk("SIG deliver (%s:%d): sig=%d sp=%p pc=%lx ra=%x\n",
               current->comm, current->pid, sig, (void *) frame, regs->cr_iip, frame->pretcode);
#endif

        return 1;

  give_sigsegv:
        force_sigsegv(sig, current);
        return 0;
}

static int
setup_rt_frame_ia32 (int sig, struct k_sigaction *ka, siginfo_t *info,
                     sigset_t *set, struct pt_regs * regs)
{
        struct exec_domain *ed = current_thread_info()->exec_domain;
        compat_uptr_t pinfo, puc;
        struct rt_sigframe_ia32 __user *frame;
        int err = 0;

        frame = get_sigframe(ka, regs, sizeof(*frame));

        if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
                goto give_sigsegv;

        err |= __put_user((ed && ed->signal_invmap
                           && sig < 32 ? ed->signal_invmap[sig] : sig), &frame->sig);

        pinfo = (long __user) &frame->info;
        puc = (long __user) &frame->uc;
        err |= __put_user(pinfo, &frame->pinfo);
        err |= __put_user(puc, &frame->puc);
        err |= copy_siginfo_to_user32(&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(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
        err |= __put_user(sas_ss_flags(regs->r12), &frame->uc.uc_stack.ss_flags);
        err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
        err |= setup_sigcontext_ia32(&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.  If provided, use a stub
           already in userspace.  */
        if (ka->sa.sa_flags & SA_RESTORER) {
                unsigned int restorer = IA32_SA_RESTORER(ka);
                err |= __put_user(restorer, &frame->pretcode);
        } else {
                /* Pointing to rt_restorer in ia32 gate page */
                err |= __put_user(IA32_GATE_OFFSET + 8, &frame->pretcode);
        }

        /* This is movl $,%eax ; int $0x80
         * and there for historical reasons only.
         * See arch/i386/kernel/signal.c
         */

        err |= __put_user(0xb8, (char __user *)(frame->retcode+0));
        err |= __put_user(__IA32_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->r12 = (unsigned long) frame;
        regs->cr_iip = IA32_SA_HANDLER(ka);

        set_fs(USER_DS);

#if 0
        regs->eflags &= ~TF_MASK;
#endif

#if 0
        printk("SIG deliver (%s:%d): sp=%p pc=%lx ra=%x\n",
               current->comm, current->pid, (void *) frame, regs->cr_iip, frame->pretcode);
#endif

        return 1;

give_sigsegv:
        force_sigsegv(sig, current);
        return 0;
}

int
ia32_setup_frame1 (int sig, struct k_sigaction *ka, siginfo_t *info,
                   sigset_t *set, struct pt_regs *regs)
{
       /* Set up the stack frame */
       if (ka->sa.sa_flags & SA_SIGINFO)
               return setup_rt_frame_ia32(sig, ka, info, set, regs);
       else
               return setup_frame_ia32(sig, ka, set, regs);
}

asmlinkage long
sys32_sigreturn (int arg0, int arg1, int arg2, int arg3, int arg4, int arg5,
                 int arg6, int arg7, struct pt_regs regs)
{
        unsigned long esp = (unsigned int) regs.r12;
        struct sigframe_ia32 __user *frame = (struct sigframe_ia32 __user *)(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)
            || (_COMPAT_NSIG_WORDS > 1 && __copy_from_user((char *) &set.sig + 4, &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_ia32(&regs, &frame->sc, &eax))
                goto badframe;
        return eax;

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

asmlinkage long
sys32_rt_sigreturn (int arg0, int arg1, int arg2, int arg3, int arg4,
                    int arg5, int arg6, int arg7, struct pt_regs regs)
{
        unsigned long esp = (unsigned int) regs.r12;
        struct rt_sigframe_ia32 __user *frame = (struct rt_sigframe_ia32 __user *)(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_ia32(&regs, &frame->uc.uc_mcontext, &eax))
                goto badframe;

        /* It is more difficult to avoid calling this function than to
           call it and ignore errors.  */
        do_sigaltstack((stack_t __user *) &frame->uc.uc_stack, NULL, esp);

        return eax;

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