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ia32_signal.c

/*
 * 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

00044 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];
};

00054 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;
}

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