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compat_linux.c

/*
 *  arch/s390x/kernel/linux32.c
 *
 *  S390 version
 *    Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
 *               Gerhard Tonn (ton@de.ibm.com)   
 *               Thomas Spatzier (tspat@de.ibm.com)
 *
 *  Conversion between 31bit and 64bit native syscalls.
 *
 * Heavily inspired by the 32-bit Sparc compat code which is 
 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
 *
 */


#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/fs.h> 
#include <linux/mm.h> 
#include <linux/file.h> 
#include <linux/signal.h>
#include <linux/resource.h>
#include <linux/times.h>
#include <linux/utsname.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/slab.h>
#include <linux/uio.h>
#include <linux/nfs_fs.h>
#include <linux/quota.h>
#include <linux/module.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/cache.h>
#include <linux/nfsd/xdr.h>
#include <linux/nfsd/syscall.h>
#include <linux/poll.h>
#include <linux/personality.h>
#include <linux/stat.h>
#include <linux/filter.h>
#include <linux/highmem.h>
#include <linux/highuid.h>
#include <linux/mman.h>
#include <linux/ipv6.h>
#include <linux/in.h>
#include <linux/icmpv6.h>
#include <linux/syscalls.h>
#include <linux/sysctl.h>
#include <linux/binfmts.h>
#include <linux/capability.h>
#include <linux/compat.h>
#include <linux/vfs.h>
#include <linux/ptrace.h>
#include <linux/fadvise.h>
#include <linux/ipc.h>

#include <asm/types.h>
#include <asm/uaccess.h>

#include <net/scm.h>
#include <net/sock.h>

#include "compat_linux.h"

long psw_user32_bits    = (PSW_BASE32_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
                     PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
                     PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
long psw32_user_bits    = (PSW32_BASE_BITS | PSW32_MASK_DAT | PSW32_ASC_HOME |
                     PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
                     PSW32_MASK_PSTATE);
 
/* For this source file, we want overflow handling. */

#undef high2lowuid
#undef high2lowgid
#undef low2highuid
#undef low2highgid
#undef SET_UID16
#undef SET_GID16
#undef NEW_TO_OLD_UID
#undef NEW_TO_OLD_GID
#undef SET_OLDSTAT_UID
#undef SET_OLDSTAT_GID
#undef SET_STAT_UID
#undef SET_STAT_GID

#define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
#define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
#define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
#define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
#define SET_UID16(var, uid)   var = high2lowuid(uid)
#define SET_GID16(var, gid)   var = high2lowgid(gid)
#define NEW_TO_OLD_UID(uid)   high2lowuid(uid)
#define NEW_TO_OLD_GID(gid)   high2lowgid(gid)
#define SET_OLDSTAT_UID(stat, uid)  (stat).st_uid = high2lowuid(uid)
#define SET_OLDSTAT_GID(stat, gid)  (stat).st_gid = high2lowgid(gid)
#define SET_STAT_UID(stat, uid)           (stat).st_uid = high2lowuid(uid)
#define SET_STAT_GID(stat, gid)           (stat).st_gid = high2lowgid(gid)

asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
{
      return sys_chown(filename, low2highuid(user), low2highgid(group));
}

asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
{
      return sys_lchown(filename, low2highuid(user), low2highgid(group));
}

asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
{
      return sys_fchown(fd, low2highuid(user), low2highgid(group));
}

asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
{
      return sys_setregid(low2highgid(rgid), low2highgid(egid));
}

asmlinkage long sys32_setgid16(u16 gid)
{
      return sys_setgid((gid_t)gid);
}

asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
{
      return sys_setreuid(low2highuid(ruid), low2highuid(euid));
}

asmlinkage long sys32_setuid16(u16 uid)
{
      return sys_setuid((uid_t)uid);
}

asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
{
      return sys_setresuid(low2highuid(ruid), low2highuid(euid),
            low2highuid(suid));
}

asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user *suid)
{
      int retval;

      if (!(retval = put_user(high2lowuid(current->uid), ruid)) &&
          !(retval = put_user(high2lowuid(current->euid), euid)))
            retval = put_user(high2lowuid(current->suid), suid);

      return retval;
}

asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
{
      return sys_setresgid(low2highgid(rgid), low2highgid(egid),
            low2highgid(sgid));
}

asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user *sgid)
{
      int retval;

      if (!(retval = put_user(high2lowgid(current->gid), rgid)) &&
          !(retval = put_user(high2lowgid(current->egid), egid)))
            retval = put_user(high2lowgid(current->sgid), sgid);

      return retval;
}

asmlinkage long sys32_setfsuid16(u16 uid)
{
      return sys_setfsuid((uid_t)uid);
}

asmlinkage long sys32_setfsgid16(u16 gid)
{
      return sys_setfsgid((gid_t)gid);
}

static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)
{
      int i;
      u16 group;

      for (i = 0; i < group_info->ngroups; i++) {
            group = (u16)GROUP_AT(group_info, i);
            if (put_user(group, grouplist+i))
                  return -EFAULT;
      }

      return 0;
}

static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
{
      int i;
      u16 group;

      for (i = 0; i < group_info->ngroups; i++) {
            if (get_user(group, grouplist+i))
                  return  -EFAULT;
            GROUP_AT(group_info, i) = (gid_t)group;
      }

      return 0;
}

asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
{
      int i;

      if (gidsetsize < 0)
            return -EINVAL;

      get_group_info(current->group_info);
      i = current->group_info->ngroups;
      if (gidsetsize) {
            if (i > gidsetsize) {
                  i = -EINVAL;
                  goto out;
            }
            if (groups16_to_user(grouplist, current->group_info)) {
                  i = -EFAULT;
                  goto out;
            }
      }
out:
      put_group_info(current->group_info);
      return i;
}

asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
{
      struct group_info *group_info;
      int retval;

      if (!capable(CAP_SETGID))
            return -EPERM;
      if ((unsigned)gidsetsize > NGROUPS_MAX)
            return -EINVAL;

      group_info = groups_alloc(gidsetsize);
      if (!group_info)
            return -ENOMEM;
      retval = groups16_from_user(group_info, grouplist);
      if (retval) {
            put_group_info(group_info);
            return retval;
      }

      retval = set_current_groups(group_info);
      put_group_info(group_info);

      return retval;
}

asmlinkage long sys32_getuid16(void)
{
      return high2lowuid(current->uid);
}

asmlinkage long sys32_geteuid16(void)
{
      return high2lowuid(current->euid);
}

asmlinkage long sys32_getgid16(void)
{
      return high2lowgid(current->gid);
}

asmlinkage long sys32_getegid16(void)
{
      return high2lowgid(current->egid);
}

/* 32-bit timeval and related flotsam.  */

static inline long get_tv32(struct timeval *o, struct compat_timeval __user *i)
{
      return (!access_ok(VERIFY_READ, o, sizeof(*o)) ||
            (__get_user(o->tv_sec, &i->tv_sec) ||
             __get_user(o->tv_usec, &i->tv_usec)));
}

static inline long put_tv32(struct compat_timeval __user *o, struct timeval *i)
{
      return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
            (__put_user(i->tv_sec, &o->tv_sec) ||
             __put_user(i->tv_usec, &o->tv_usec)));
}

/*
 * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation.
 *
 * This is really horribly ugly.
 */
#ifdef CONFIG_SYSVIPC
asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr)
{
      if (call >> 16)         /* hack for backward compatibility */
            return -EINVAL;

      call &= 0xffff;

      switch (call) {
      case SEMTIMEDOP:
            return compat_sys_semtimedop(first, compat_ptr(ptr),
                                   second, compat_ptr(third));
      case SEMOP:
            /* struct sembuf is the same on 32 and 64bit :)) */
            return sys_semtimedop(first, compat_ptr(ptr),
                              second, NULL);
      case SEMGET:
            return sys_semget(first, second, third);
      case SEMCTL:
            return compat_sys_semctl(first, second, third,
                               compat_ptr(ptr));
      case MSGSND:
            return compat_sys_msgsnd(first, second, third,
                               compat_ptr(ptr));
      case MSGRCV:
            return compat_sys_msgrcv(first, second, 0, third,
                               0, compat_ptr(ptr));
      case MSGGET:
            return sys_msgget((key_t) first, second);
      case MSGCTL:
            return compat_sys_msgctl(first, second, compat_ptr(ptr));
      case SHMAT:
            return compat_sys_shmat(first, second, third,
                              0, compat_ptr(ptr));
      case SHMDT:
            return sys_shmdt(compat_ptr(ptr));
      case SHMGET:
            return sys_shmget(first, (unsigned)second, third);
      case SHMCTL:
            return compat_sys_shmctl(first, second, compat_ptr(ptr));
      }

      return -ENOSYS;
}
#endif

asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
{
      if ((int)high < 0)
            return -EINVAL;
      else
            return sys_truncate(path, (high << 32) | low);
}

asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
{
      if ((int)high < 0)
            return -EINVAL;
      else
            return sys_ftruncate(fd, (high << 32) | low);
}

int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf)
{
      compat_ino_t ino;
      int err;

      if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
            return -EOVERFLOW;

      ino = stat->ino;
      if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
            return -EOVERFLOW;

      err = put_user(old_encode_dev(stat->dev), &statbuf->st_dev);
      err |= put_user(stat->ino, &statbuf->st_ino);
      err |= put_user(stat->mode, &statbuf->st_mode);
      err |= put_user(stat->nlink, &statbuf->st_nlink);
      err |= put_user(high2lowuid(stat->uid), &statbuf->st_uid);
      err |= put_user(high2lowgid(stat->gid), &statbuf->st_gid);
      err |= put_user(old_encode_dev(stat->rdev), &statbuf->st_rdev);
      err |= put_user(stat->size, &statbuf->st_size);
      err |= put_user(stat->atime.tv_sec, &statbuf->st_atime);
      err |= put_user(stat->atime.tv_nsec, &statbuf->st_atime_nsec);
      err |= put_user(stat->mtime.tv_sec, &statbuf->st_mtime);
      err |= put_user(stat->mtime.tv_nsec, &statbuf->st_mtime_nsec);
      err |= put_user(stat->ctime.tv_sec, &statbuf->st_ctime);
      err |= put_user(stat->ctime.tv_nsec, &statbuf->st_ctime_nsec);
      err |= put_user(stat->blksize, &statbuf->st_blksize);
      err |= put_user(stat->blocks, &statbuf->st_blocks);
/* fixme
      err |= put_user(0, &statbuf->__unused4[0]);
      err |= put_user(0, &statbuf->__unused4[1]);
*/
      return err;
}

asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
                        struct compat_timespec __user *interval)
{
      struct timespec t;
      int ret;
      mm_segment_t old_fs = get_fs ();
      
      set_fs (KERNEL_DS);
      ret = sys_sched_rr_get_interval(pid,
                              (struct timespec __force __user *) &t);
      set_fs (old_fs);
      if (put_compat_timespec(&t, interval))
            return -EFAULT;
      return ret;
}

asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
                  compat_sigset_t __user *oset, size_t sigsetsize)
{
      sigset_t s;
      compat_sigset_t s32;
      int ret;
      mm_segment_t old_fs = get_fs();
      
      if (set) {
            if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
                  return -EFAULT;
            switch (_NSIG_WORDS) {
            case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
            case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
            case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
            case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
            }
      }
      set_fs (KERNEL_DS);
      ret = sys_rt_sigprocmask(how,
                         set ? (sigset_t __force __user *) &s : NULL,
                         oset ? (sigset_t __force __user *) &s : NULL,
                         sigsetsize);
      set_fs (old_fs);
      if (ret) return ret;
      if (oset) {
            switch (_NSIG_WORDS) {
            case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
            case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
            case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
            case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
            }
            if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
                  return -EFAULT;
      }
      return 0;
}

asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
                        size_t sigsetsize)
{
      sigset_t s;
      compat_sigset_t s32;
      int ret;
      mm_segment_t old_fs = get_fs();
            
      set_fs (KERNEL_DS);
      ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize);
      set_fs (old_fs);
      if (!ret) {
            switch (_NSIG_WORDS) {
            case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
            case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
            case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
            case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
            }
            if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
                  return -EFAULT;
      }
      return ret;
}

asmlinkage long
sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
{
      siginfo_t info;
      int ret;
      mm_segment_t old_fs = get_fs();
      
      if (copy_siginfo_from_user32(&info, uinfo))
            return -EFAULT;
      set_fs (KERNEL_DS);
      ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info);
      set_fs (old_fs);
      return ret;
}

/*
 * sys32_execve() executes a new program after the asm stub has set
 * things up for us.  This should basically do what I want it to.
 */
asmlinkage long sys32_execve(void)
{
      struct pt_regs *regs = task_pt_regs(current);
      char *filename;
      unsigned long result;
      int rc;

      filename = getname(compat_ptr(regs->orig_gpr2));
      if (IS_ERR(filename)) {
            result = PTR_ERR(filename);
                goto out;
      }
      rc = compat_do_execve(filename, compat_ptr(regs->gprs[3]),
                        compat_ptr(regs->gprs[4]), regs);
      if (rc) {
            result = rc;
            goto out_putname;
      }
      task_lock(current);
      current->ptrace &= ~PT_DTRACE;
      task_unlock(current);
      current->thread.fp_regs.fpc=0;
      asm volatile("sfpc %0,0" : : "d" (0));
      result = regs->gprs[2];
out_putname:
        putname(filename);
out:
      return result;
}


#ifdef CONFIG_MODULES

asmlinkage long
sys32_init_module(void __user *umod, unsigned long len,
            const char __user *uargs)
{
      return sys_init_module(umod, len, uargs);
}

asmlinkage long
sys32_delete_module(const char __user *name_user, unsigned int flags)
{
      return sys_delete_module(name_user, flags);
}

#else /* CONFIG_MODULES */

asmlinkage long
sys32_init_module(void __user *umod, unsigned long len,
            const char __user *uargs)
{
      return -ENOSYS;
}

asmlinkage long
sys32_delete_module(const char __user *name_user, unsigned int flags)
{
      return -ENOSYS;
}

#endif  /* CONFIG_MODULES */

/* Translations due to time_t size differences.  Which affects all
   sorts of things, like timeval and itimerval.  */

extern struct timezone sys_tz;

asmlinkage long sys32_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
{
      if (tv) {
            struct timeval ktv;
            do_gettimeofday(&ktv);
            if (put_tv32(tv, &ktv))
                  return -EFAULT;
      }
      if (tz) {
            if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
                  return -EFAULT;
      }
      return 0;
}

static inline long get_ts32(struct timespec *o, struct compat_timeval __user *i)
{
      long usec;

      if (!access_ok(VERIFY_READ, i, sizeof(*i)))
            return -EFAULT;
      if (__get_user(o->tv_sec, &i->tv_sec))
            return -EFAULT;
      if (__get_user(usec, &i->tv_usec))
            return -EFAULT;
      o->tv_nsec = usec * 1000;
      return 0;
}

asmlinkage long sys32_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
{
      struct timespec kts;
      struct timezone ktz;

      if (tv) {
            if (get_ts32(&kts, tv))
                  return -EFAULT;
      }
      if (tz) {
            if (copy_from_user(&ktz, tz, sizeof(ktz)))
                  return -EFAULT;
      }

      return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
}

/* These are here just in case some old sparc32 binary calls it. */
asmlinkage long sys32_pause(void)
{
      current->state = TASK_INTERRUPTIBLE;
      schedule();
      return -ERESTARTNOHAND;
}

asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
                        size_t count, u32 poshi, u32 poslo)
{
      if ((compat_ssize_t) count < 0)
            return -EINVAL;
      return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
}

asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
                        size_t count, u32 poshi, u32 poslo)
{
      if ((compat_ssize_t) count < 0)
            return -EINVAL;
      return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
}

asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
{
      return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
}

asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count)
{
      mm_segment_t old_fs = get_fs();
      int ret;
      off_t of;
      
      if (offset && get_user(of, offset))
            return -EFAULT;
            
      set_fs(KERNEL_DS);
      ret = sys_sendfile(out_fd, in_fd,
                     offset ? (off_t __force __user *) &of : NULL, count);
      set_fs(old_fs);
      
      if (offset && put_user(of, offset))
            return -EFAULT;
            
      return ret;
}

asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
                        compat_loff_t __user *offset, s32 count)
{
      mm_segment_t old_fs = get_fs();
      int ret;
      loff_t lof;
      
      if (offset && get_user(lof, offset))
            return -EFAULT;
            
      set_fs(KERNEL_DS);
      ret = sys_sendfile64(out_fd, in_fd,
                       offset ? (loff_t __force __user *) &lof : NULL,
                       count);
      set_fs(old_fs);
      
      if (offset && put_user(lof, offset))
            return -EFAULT;
            
      return ret;
}

#ifdef CONFIG_SYSCTL_SYSCALL
struct __sysctl_args32 {
      u32 name;
      int nlen;
      u32 oldval;
      u32 oldlenp;
      u32 newval;
      u32 newlen;
      u32 __unused[4];
};

asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
{
      struct __sysctl_args32 tmp;
      int error;
      size_t oldlen;
      size_t __user *oldlenp = NULL;
      unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;

      if (copy_from_user(&tmp, args, sizeof(tmp)))
            return -EFAULT;

      if (tmp.oldval && tmp.oldlenp) {
            /* Duh, this is ugly and might not work if sysctl_args
               is in read-only memory, but do_sysctl does indirectly
               a lot of uaccess in both directions and we'd have to
               basically copy the whole sysctl.c here, and
               glibc's __sysctl uses rw memory for the structure
               anyway.  */
            if (get_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)) ||
                put_user(oldlen, (size_t __user *)addr))
                  return -EFAULT;
            oldlenp = (size_t __user *)addr;
      }

      lock_kernel();
      error = do_sysctl(compat_ptr(tmp.name), tmp.nlen, compat_ptr(tmp.oldval),
                    oldlenp, compat_ptr(tmp.newval), tmp.newlen);
      unlock_kernel();
      if (oldlenp) {
            if (!error) {
                  if (get_user(oldlen, (size_t __user *)addr) ||
                      put_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)))
                        error = -EFAULT;
            }
            if (copy_to_user(args->__unused, tmp.__unused,
                         sizeof(tmp.__unused)))
                  error = -EFAULT;
      }
      return error;
}
#endif

struct stat64_emu31 {
      unsigned long long  st_dev;
      unsigned int    __pad1;
#define STAT64_HAS_BROKEN_ST_INO        1
      u32             __st_ino;
      unsigned int    st_mode;
      unsigned int    st_nlink;
      u32             st_uid;
      u32             st_gid;
      unsigned long long  st_rdev;
      unsigned int    __pad3;
      long            st_size;
      u32             st_blksize;
      unsigned char   __pad4[4];
      u32             __pad5;     /* future possible st_blocks high bits */
      u32             st_blocks;  /* Number 512-byte blocks allocated. */
      u32             st_atime;
      u32             __pad6;
      u32             st_mtime;
      u32             __pad7;
      u32             st_ctime;
      u32             __pad8;     /* will be high 32 bits of ctime someday */
      unsigned long   st_ino;
};    

static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
{
      struct stat64_emu31 tmp;

      memset(&tmp, 0, sizeof(tmp));

      tmp.st_dev = huge_encode_dev(stat->dev);
      tmp.st_ino = stat->ino;
      tmp.__st_ino = (u32)stat->ino;
      tmp.st_mode = stat->mode;
      tmp.st_nlink = (unsigned int)stat->nlink;
      tmp.st_uid = stat->uid;
      tmp.st_gid = stat->gid;
      tmp.st_rdev = huge_encode_dev(stat->rdev);
      tmp.st_size = stat->size;
      tmp.st_blksize = (u32)stat->blksize;
      tmp.st_blocks = (u32)stat->blocks;
      tmp.st_atime = (u32)stat->atime.tv_sec;
      tmp.st_mtime = (u32)stat->mtime.tv_sec;
      tmp.st_ctime = (u32)stat->ctime.tv_sec;

      return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; 
}

asmlinkage long sys32_stat64(char __user * filename, struct stat64_emu31 __user * statbuf)
{
      struct kstat stat;
      int ret = vfs_stat(filename, &stat);
      if (!ret)
            ret = cp_stat64(statbuf, &stat);
      return ret;
}

asmlinkage long sys32_lstat64(char __user * filename, struct stat64_emu31 __user * statbuf)
{
      struct kstat stat;
      int ret = vfs_lstat(filename, &stat);
      if (!ret)
            ret = cp_stat64(statbuf, &stat);
      return ret;
}

asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
{
      struct kstat stat;
      int ret = vfs_fstat(fd, &stat);
      if (!ret)
            ret = cp_stat64(statbuf, &stat);
      return ret;
}

asmlinkage long sys32_fstatat64(unsigned int dfd, char __user *filename,
                        struct stat64_emu31 __user* statbuf, int flag)
{
      struct kstat stat;
      int error = -EINVAL;

      if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
            goto out;

      if (flag & AT_SYMLINK_NOFOLLOW)
            error = vfs_lstat_fd(dfd, filename, &stat);
      else
            error = vfs_stat_fd(dfd, filename, &stat);

      if (!error)
            error = cp_stat64(statbuf, &stat);
out:
      return error;
}

/*
 * Linux/i386 didn't use to be able to handle more than
 * 4 system call parameters, so these system calls used a memory
 * block for parameter passing..
 */

struct mmap_arg_struct_emu31 {
      u32   addr;
      u32   len;
      u32   prot;
      u32   flags;
      u32   fd;
      u32   offset;
};

/* common code for old and new mmaps */
static inline long do_mmap2(
      unsigned long addr, unsigned long len,
      unsigned long prot, unsigned long flags,
      unsigned long fd, unsigned long pgoff)
{
      struct file * file = NULL;
      unsigned long error = -EBADF;

      flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
      if (!(flags & MAP_ANONYMOUS)) {
            file = fget(fd);
            if (!file)
                  goto out;
      }

      down_write(&current->mm->mmap_sem);
      error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
      if (!IS_ERR((void *) error) && error + len >= 0x80000000ULL) {
            /* Result is out of bounds.  */
            do_munmap(current->mm, addr, len);
            error = -ENOMEM;
      }
      up_write(&current->mm->mmap_sem);

      if (file)
            fput(file);
out:    
      return error;
}


asmlinkage unsigned long
old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
{
      struct mmap_arg_struct_emu31 a;
      int error = -EFAULT;

      if (copy_from_user(&a, arg, sizeof(a)))
            goto out;

      error = -EINVAL;
      if (a.offset & ~PAGE_MASK)
            goto out;

      error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT); 
out:
      return error;
}

asmlinkage long 
sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
{
      struct mmap_arg_struct_emu31 a;
      int error = -EFAULT;

      if (copy_from_user(&a, arg, sizeof(a)))
            goto out;
      error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
out:
      return error;
}

asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
{
      if ((compat_ssize_t) count < 0)
            return -EINVAL; 

      return sys_read(fd, buf, count);
}

asmlinkage long sys32_write(unsigned int fd, char __user * buf, size_t count)
{
      if ((compat_ssize_t) count < 0)
            return -EINVAL; 

      return sys_write(fd, buf, count);
}

asmlinkage long sys32_clone(void)
{
      struct pt_regs *regs = task_pt_regs(current);
      unsigned long clone_flags;
      unsigned long newsp;
      int __user *parent_tidptr, *child_tidptr;

      clone_flags = regs->gprs[3] & 0xffffffffUL;
      newsp = regs->orig_gpr2 & 0x7fffffffUL;
      parent_tidptr = compat_ptr(regs->gprs[4]);
      child_tidptr = compat_ptr(regs->gprs[5]);
      if (!newsp)
            newsp = regs->gprs[15];
      return do_fork(clone_flags, newsp, regs, 0,
                   parent_tidptr, child_tidptr);
}

/*
 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
 * because the 31 bit values differ from the 64 bit values.
 */

asmlinkage long
sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
{
      if (advise == 4)
            advise = POSIX_FADV_DONTNEED;
      else if (advise == 5)
            advise = POSIX_FADV_NOREUSE;
      return sys_fadvise64(fd, offset, len, advise);
}

struct fadvise64_64_args {
      int fd;
      long long offset;
      long long len;
      int advice;
};

asmlinkage long
sys32_fadvise64_64(struct fadvise64_64_args __user *args)
{
      struct fadvise64_64_args a;

      if ( copy_from_user(&a, args, sizeof(a)) )
            return -EFAULT;
      if (a.advice == 4)
            a.advice = POSIX_FADV_DONTNEED;
      else if (a.advice == 5)
            a.advice = POSIX_FADV_NOREUSE;
      return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
}

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