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/*
 *  Linux syscalls
 *
 *  Copyright (c) 2003 Fabrice Bellard
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
 */
#define _ATFILE_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <elf.h>
#include <endian.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/mman.h>
#include <sys/swap.h>
#include <signal.h>
#include <sched.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/uio.h>
#include <sys/poll.h>
#include <sys/times.h>
#include <sys/shm.h>
#include <sys/sem.h>
#include <sys/statfs.h>
#include <utime.h>
#include <sys/sysinfo.h>
#include <sys/utsname.h>
//#include <sys/user.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <qemu-common.h>
#ifdef TARGET_GPROF
#include <sys/gmon.h>
#endif
#ifdef CONFIG_EVENTFD
#include <sys/eventfd.h>
#endif

#define termios host_termios
#define winsize host_winsize
#define termio host_termio
#define sgttyb host_sgttyb /* same as target */
#define tchars host_tchars /* same as target */
#define ltchars host_ltchars /* same as target */

#include <linux/termios.h>
#include <linux/unistd.h>
#include <linux/utsname.h>
#include <linux/cdrom.h>
#include <linux/hdreg.h>
#include <linux/soundcard.h>
#include <linux/kd.h>
#include <linux/mtio.h>
#include <linux/fs.h>
#include <linux/fb.h>
#include <linux/vt.h>
#include "linux_loop.h"

#include "qemu.h"
#include "qemu-common.h"

#if defined(CONFIG_USE_NPTL)
#define CLONE_NPTL_FLAGS2 (CLONE_SETTLS | \
    CLONE_PARENT_SETTID | CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)
#else
/* XXX: Hardcode the above values.  */
#define CLONE_NPTL_FLAGS2 0
#endif

//#define DEBUG

//#include <linux/msdos_fs.h>
#define	VFAT_IOCTL_READDIR_BOTH		_IOR('r', 1, struct linux_dirent [2])
#define	VFAT_IOCTL_READDIR_SHORT	_IOR('r', 2, struct linux_dirent [2])


#undef _syscall0
#undef _syscall1
#undef _syscall2
#undef _syscall3
#undef _syscall4
#undef _syscall5
#undef _syscall6

#define _syscall0(type,name)		\
static type name (void)			\
{					\
	return syscall(__NR_##name);	\
}

#define _syscall1(type,name,type1,arg1)		\
static type name (type1 arg1)			\
{						\
	return syscall(__NR_##name, arg1);	\
}

#define _syscall2(type,name,type1,arg1,type2,arg2)	\
static type name (type1 arg1,type2 arg2)		\
{							\
	return syscall(__NR_##name, arg1, arg2);	\
}

#define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3)	\
static type name (type1 arg1,type2 arg2,type3 arg3)		\
{								\
	return syscall(__NR_##name, arg1, arg2, arg3);		\
}

#define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4)	\
static type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4)			\
{										\
	return syscall(__NR_##name, arg1, arg2, arg3, arg4);			\
}

#define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,	\
		  type5,arg5)							\
static type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5)	\
{										\
	return syscall(__NR_##name, arg1, arg2, arg3, arg4, arg5);		\
}


#define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,	\
		  type5,arg5,type6,arg6)					\
static type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5,	\
                  type6 arg6)							\
{										\
	return syscall(__NR_##name, arg1, arg2, arg3, arg4, arg5, arg6);	\
}


#define __NR_sys_uname __NR_uname
#define __NR_sys_faccessat __NR_faccessat
#define __NR_sys_fchmodat __NR_fchmodat
#define __NR_sys_fchownat __NR_fchownat
#define __NR_sys_fstatat64 __NR_fstatat64
#define __NR_sys_futimesat __NR_futimesat
#define __NR_sys_getcwd1 __NR_getcwd
#define __NR_sys_getdents __NR_getdents
#define __NR_sys_getdents64 __NR_getdents64
#define __NR_sys_getpriority __NR_getpriority
#define __NR_sys_linkat __NR_linkat
#define __NR_sys_mkdirat __NR_mkdirat
#define __NR_sys_mknodat __NR_mknodat
#define __NR_sys_newfstatat __NR_newfstatat
#define __NR_sys_openat __NR_openat
#define __NR_sys_readlinkat __NR_readlinkat
#define __NR_sys_renameat __NR_renameat
#define __NR_sys_rt_sigqueueinfo __NR_rt_sigqueueinfo
#define __NR_sys_symlinkat __NR_symlinkat
#define __NR_sys_syslog __NR_syslog
#define __NR_sys_tgkill __NR_tgkill
#define __NR_sys_tkill __NR_tkill
#define __NR_sys_unlinkat __NR_unlinkat
#define __NR_sys_utimensat __NR_utimensat
#define __NR_sys_futex __NR_futex
#define __NR_sys_inotify_init __NR_inotify_init
#define __NR_sys_inotify_add_watch __NR_inotify_add_watch
#define __NR_sys_inotify_rm_watch __NR_inotify_rm_watch

#if defined(__alpha__) || defined (__ia64__) || defined(__x86_64__)
#define __NR__llseek __NR_lseek
#endif

#ifdef __NR_gettid
_syscall0(int, gettid)
#else
/* This is a replacement for the host gettid() and must return a host
   errno. */
static int gettid(void) {
    return -ENOSYS;
}
#endif
_syscall3(int, sys_getdents, uint, fd, struct linux_dirent *, dirp, uint, count);
#if defined(TARGET_NR_getdents64) && defined(__NR_getdents64)
_syscall3(int, sys_getdents64, uint, fd, struct linux_dirent64 *, dirp, uint, count);
#endif
_syscall2(int, sys_getpriority, int, which, int, who);
#if defined(TARGET_NR__llseek) && !defined (__x86_64__)
_syscall5(int, _llseek,  uint,  fd, ulong, hi, ulong, lo,
          loff_t *, res, uint, wh);
#endif
_syscall3(int,sys_rt_sigqueueinfo,int,pid,int,sig,siginfo_t *,uinfo)
_syscall3(int,sys_syslog,int,type,char*,bufp,int,len)
#if defined(TARGET_NR_tgkill) && defined(__NR_tgkill)
_syscall3(int,sys_tgkill,int,tgid,int,pid,int,sig)
#endif
#if defined(TARGET_NR_tkill) && defined(__NR_tkill)
_syscall2(int,sys_tkill,int,tid,int,sig)
#endif
#ifdef __NR_exit_group
_syscall1(int,exit_group,int,error_code)
#endif
#if defined(TARGET_NR_set_tid_address) && defined(__NR_set_tid_address)
_syscall1(int,set_tid_address,int *,tidptr)
#endif
#if defined(CONFIG_USE_NPTL)
#if defined(TARGET_NR_futex) && defined(__NR_futex)
_syscall6(int,sys_futex,int *,uaddr,int,op,int,val,
          const struct timespec *,timeout,int *,uaddr2,int,val3)
#endif
#endif

static bitmask_transtbl fcntl_flags_tbl[] = {
  { TARGET_O_ACCMODE,   TARGET_O_WRONLY,    O_ACCMODE,   O_WRONLY,    },
  { TARGET_O_ACCMODE,   TARGET_O_RDWR,      O_ACCMODE,   O_RDWR,      },
  { TARGET_O_CREAT,     TARGET_O_CREAT,     O_CREAT,     O_CREAT,     },
  { TARGET_O_EXCL,      TARGET_O_EXCL,      O_EXCL,      O_EXCL,      },
  { TARGET_O_NOCTTY,    TARGET_O_NOCTTY,    O_NOCTTY,    O_NOCTTY,    },
  { TARGET_O_TRUNC,     TARGET_O_TRUNC,     O_TRUNC,     O_TRUNC,     },
  { TARGET_O_APPEND,    TARGET_O_APPEND,    O_APPEND,    O_APPEND,    },
  { TARGET_O_NONBLOCK,  TARGET_O_NONBLOCK,  O_NONBLOCK,  O_NONBLOCK,  },
  { TARGET_O_SYNC,      TARGET_O_SYNC,      O_SYNC,      O_SYNC,      },
  { TARGET_FASYNC,      TARGET_FASYNC,      FASYNC,      FASYNC,      },
  { TARGET_O_DIRECTORY, TARGET_O_DIRECTORY, O_DIRECTORY, O_DIRECTORY, },
  { TARGET_O_NOFOLLOW,  TARGET_O_NOFOLLOW,  O_NOFOLLOW,  O_NOFOLLOW,  },
  { TARGET_O_LARGEFILE, TARGET_O_LARGEFILE, O_LARGEFILE, O_LARGEFILE, },
#if defined(O_DIRECT)
  { TARGET_O_DIRECT,    TARGET_O_DIRECT,    O_DIRECT,    O_DIRECT,    },
#endif
  { 0, 0, 0, 0 }
};

#define COPY_UTSNAME_FIELD(dest, src) \
  do { \
      /* __NEW_UTS_LEN doesn't include terminating null */ \
      (void) strncpy((dest), (src), __NEW_UTS_LEN); \
      (dest)[__NEW_UTS_LEN] = '\0'; \
  } while (0)

static int sys_uname(struct new_utsname *buf)
{
  struct utsname uts_buf;

  if (uname(&uts_buf) < 0)
      return (-1);

  /*
   * Just in case these have some differences, we
   * translate utsname to new_utsname (which is the
   * struct linux kernel uses).
   */

  bzero(buf, sizeof (*buf));
  COPY_UTSNAME_FIELD(buf->sysname, uts_buf.sysname);
  COPY_UTSNAME_FIELD(buf->nodename, uts_buf.nodename);
  COPY_UTSNAME_FIELD(buf->release, uts_buf.release);
  COPY_UTSNAME_FIELD(buf->version, uts_buf.version);
  COPY_UTSNAME_FIELD(buf->machine, uts_buf.machine);
#ifdef _GNU_SOURCE
  COPY_UTSNAME_FIELD(buf->domainname, uts_buf.domainname);
#endif
  return (0);

#undef COPY_UTSNAME_FIELD
}

static int sys_getcwd1(char *buf, size_t size)
{
  if (getcwd(buf, size) == NULL) {
      /* getcwd() sets errno */
      return (-1);
  }
  return strlen(buf)+1;
}

#ifdef CONFIG_ATFILE
/*
 * Host system seems to have atfile syscall stubs available.  We
 * now enable them one by one as specified by target syscall_nr.h.
 */

#ifdef TARGET_NR_faccessat
static int sys_faccessat(int dirfd, const char *pathname, int mode)
{
  return (faccessat(dirfd, pathname, mode, 0));
}
#endif
#ifdef TARGET_NR_fchmodat
static int sys_fchmodat(int dirfd, const char *pathname, mode_t mode)
{
  return (fchmodat(dirfd, pathname, mode, 0));
}
#endif
#if defined(TARGET_NR_fchownat) && defined(USE_UID16)
static int sys_fchownat(int dirfd, const char *pathname, uid_t owner,
    gid_t group, int flags)
{
  return (fchownat(dirfd, pathname, owner, group, flags));
}
#endif
#ifdef __NR_fstatat64
static int sys_fstatat64(int dirfd, const char *pathname, struct stat *buf,
    int flags)
{
  return (fstatat(dirfd, pathname, buf, flags));
}
#endif
#ifdef __NR_newfstatat
static int sys_newfstatat(int dirfd, const char *pathname, struct stat *buf,
    int flags)
{
  return (fstatat(dirfd, pathname, buf, flags));
}
#endif
#ifdef TARGET_NR_futimesat
static int sys_futimesat(int dirfd, const char *pathname,
    const struct timeval times[2])
{
  return (futimesat(dirfd, pathname, times));
}
#endif
#ifdef TARGET_NR_linkat
static int sys_linkat(int olddirfd, const char *oldpath,
    int newdirfd, const char *newpath, int flags)
{
  return (linkat(olddirfd, oldpath, newdirfd, newpath, flags));
}
#endif
#ifdef TARGET_NR_mkdirat
static int sys_mkdirat(int dirfd, const char *pathname, mode_t mode)
{
  return (mkdirat(dirfd, pathname, mode));
}
#endif
#ifdef TARGET_NR_mknodat
static int sys_mknodat(int dirfd, const char *pathname, mode_t mode,
    dev_t dev)
{
  return (mknodat(dirfd, pathname, mode, dev));
}
#endif
#ifdef TARGET_NR_openat
static int sys_openat(int dirfd, const char *pathname, int flags, ...)
{
  /*
   * open(2) has extra parameter 'mode' when called with
   * flag O_CREAT.
   */
  if ((flags & O_CREAT) != 0) {
      va_list ap;
      mode_t mode;

      /*
       * Get the 'mode' parameter and translate it to
       * host bits.
       */
      va_start(ap, flags);
      mode = va_arg(ap, mode_t);
      mode = target_to_host_bitmask(mode, fcntl_flags_tbl);
      va_end(ap);

      return (openat(dirfd, pathname, flags, mode));
  }
  return (openat(dirfd, pathname, flags));
}
#endif
#ifdef TARGET_NR_readlinkat
static int sys_readlinkat(int dirfd, const char *pathname, char *buf, size_t bufsiz)
{
  return (readlinkat(dirfd, pathname, buf, bufsiz));
}
#endif
#ifdef TARGET_NR_renameat
static int sys_renameat(int olddirfd, const char *oldpath,
    int newdirfd, const char *newpath)
{
  return (renameat(olddirfd, oldpath, newdirfd, newpath));
}
#endif
#ifdef TARGET_NR_symlinkat
static int sys_symlinkat(const char *oldpath, int newdirfd, const char *newpath)
{
  return (symlinkat(oldpath, newdirfd, newpath));
}
#endif
#ifdef TARGET_NR_unlinkat
static int sys_unlinkat(int dirfd, const char *pathname, int flags)
{
  return (unlinkat(dirfd, pathname, flags));
}
#endif
#else /* !CONFIG_ATFILE */

/*
 * Try direct syscalls instead
 */
#if defined(TARGET_NR_faccessat) && defined(__NR_faccessat)
_syscall3(int,sys_faccessat,int,dirfd,const char *,pathname,int,mode)
#endif
#if defined(TARGET_NR_fchmodat) && defined(__NR_fchmodat)
_syscall3(int,sys_fchmodat,int,dirfd,const char *,pathname, mode_t,mode)
#endif
#if defined(TARGET_NR_fchownat) && defined(__NR_fchownat) && defined(USE_UID16)
_syscall5(int,sys_fchownat,int,dirfd,const char *,pathname,
          uid_t,owner,gid_t,group,int,flags)
#endif
#if (defined(TARGET_NR_fstatat64) || defined(TARGET_NR_newfstatat)) && \
        defined(__NR_fstatat64)
_syscall4(int,sys_fstatat64,int,dirfd,const char *,pathname,
          struct stat *,buf,int,flags)
#endif
#if defined(TARGET_NR_futimesat) && defined(__NR_futimesat)
_syscall3(int,sys_futimesat,int,dirfd,const char *,pathname,
         const struct timeval *,times)
#endif
#if (defined(TARGET_NR_newfstatat) || defined(TARGET_NR_fstatat64) ) && \
        defined(__NR_newfstatat)
_syscall4(int,sys_newfstatat,int,dirfd,const char *,pathname,
          struct stat *,buf,int,flags)
#endif
#if defined(TARGET_NR_linkat) && defined(__NR_linkat)
_syscall5(int,sys_linkat,int,olddirfd,const char *,oldpath,
      int,newdirfd,const char *,newpath,int,flags)
#endif
#if defined(TARGET_NR_mkdirat) && defined(__NR_mkdirat)
_syscall3(int,sys_mkdirat,int,dirfd,const char *,pathname,mode_t,mode)
#endif
#if defined(TARGET_NR_mknodat) && defined(__NR_mknodat)
_syscall4(int,sys_mknodat,int,dirfd,const char *,pathname,
          mode_t,mode,dev_t,dev)
#endif
#if defined(TARGET_NR_openat) && defined(__NR_openat)
_syscall4(int,sys_openat,int,dirfd,const char *,pathname,int,flags,mode_t,mode)
#endif
#if defined(TARGET_NR_readlinkat) && defined(__NR_readlinkat)
_syscall4(int,sys_readlinkat,int,dirfd,const char *,pathname,
          char *,buf,size_t,bufsize)
#endif
#if defined(TARGET_NR_renameat) && defined(__NR_renameat)
_syscall4(int,sys_renameat,int,olddirfd,const char *,oldpath,
          int,newdirfd,const char *,newpath)
#endif
#if defined(TARGET_NR_symlinkat) && defined(__NR_symlinkat)
_syscall3(int,sys_symlinkat,const char *,oldpath,
          int,newdirfd,const char *,newpath)
#endif
#if defined(TARGET_NR_unlinkat) && defined(__NR_unlinkat)
_syscall3(int,sys_unlinkat,int,dirfd,const char *,pathname,int,flags)
#endif

#endif /* CONFIG_ATFILE */

#ifdef CONFIG_UTIMENSAT
static int sys_utimensat(int dirfd, const char *pathname,
    const struct timespec times[2], int flags)
{
    if (pathname == NULL)
        return futimens(dirfd, times);
    else
        return utimensat(dirfd, pathname, times, flags);
}
#else
#if defined(TARGET_NR_utimensat) && defined(__NR_utimensat)
_syscall4(int,sys_utimensat,int,dirfd,const char *,pathname,
          const struct timespec *,tsp,int,flags)
#endif
#endif /* CONFIG_UTIMENSAT  */

#ifdef CONFIG_INOTIFY
#include <sys/inotify.h>

#if defined(TARGET_NR_inotify_init) && defined(__NR_inotify_init)
static int sys_inotify_init(void)
{
  return (inotify_init());
}
#endif
#if defined(TARGET_NR_inotify_add_watch) && defined(__NR_inotify_add_watch)
static int sys_inotify_add_watch(int fd,const char *pathname, int32_t mask)
{
  return (inotify_add_watch(fd, pathname, mask));
}
#endif
#if defined(TARGET_NR_inotify_rm_watch) && defined(__NR_inotify_rm_watch)
static int sys_inotify_rm_watch(int fd, int32_t wd)
{
  return (inotify_rm_watch(fd, wd));
}
#endif
#else
/* Userspace can usually survive runtime without inotify */
#undef TARGET_NR_inotify_init
#undef TARGET_NR_inotify_add_watch
#undef TARGET_NR_inotify_rm_watch
#endif /* CONFIG_INOTIFY  */


extern int personality(int);
extern int flock(int, int);
extern int setfsuid(int);
extern int setfsgid(int);
extern int setgroups(int, gid_t *);

#define ERRNO_TABLE_SIZE 1200

/* target_to_host_errno_table[] is initialized from
 * host_to_target_errno_table[] in syscall_init(). */
static uint16_t target_to_host_errno_table[ERRNO_TABLE_SIZE] = {
};

/*
 * This list is the union of errno values overridden in asm-<arch>/errno.h
 * minus the errnos that are not actually generic to all archs.
 */
static uint16_t host_to_target_errno_table[ERRNO_TABLE_SIZE] = {
    [EIDRM]		= TARGET_EIDRM,
    [ECHRNG]		= TARGET_ECHRNG,
    [EL2NSYNC]		= TARGET_EL2NSYNC,
    [EL3HLT]		= TARGET_EL3HLT,
    [EL3RST]		= TARGET_EL3RST,
    [ELNRNG]		= TARGET_ELNRNG,
    [EUNATCH]		= TARGET_EUNATCH,
    [ENOCSI]		= TARGET_ENOCSI,
    [EL2HLT]		= TARGET_EL2HLT,
    [EDEADLK]		= TARGET_EDEADLK,
    [ENOLCK]		= TARGET_ENOLCK,
    [EBADE]		= TARGET_EBADE,
    [EBADR]		= TARGET_EBADR,
    [EXFULL]		= TARGET_EXFULL,
    [ENOANO]		= TARGET_ENOANO,
    [EBADRQC]		= TARGET_EBADRQC,
    [EBADSLT]		= TARGET_EBADSLT,
    [EBFONT]		= TARGET_EBFONT,
    [ENOSTR]		= TARGET_ENOSTR,
    [ENODATA]		= TARGET_ENODATA,
    [ETIME]		= TARGET_ETIME,
    [ENOSR]		= TARGET_ENOSR,
    [ENONET]		= TARGET_ENONET,
    [ENOPKG]		= TARGET_ENOPKG,
    [EREMOTE]		= TARGET_EREMOTE,
    [ENOLINK]		= TARGET_ENOLINK,
    [EADV]		= TARGET_EADV,
    [ESRMNT]		= TARGET_ESRMNT,
    [ECOMM]		= TARGET_ECOMM,
    [EPROTO]		= TARGET_EPROTO,
    [EDOTDOT]		= TARGET_EDOTDOT,
    [EMULTIHOP]		= TARGET_EMULTIHOP,
    [EBADMSG]		= TARGET_EBADMSG,
    [ENAMETOOLONG]	= TARGET_ENAMETOOLONG,
    [EOVERFLOW]		= TARGET_EOVERFLOW,
    [ENOTUNIQ]		= TARGET_ENOTUNIQ,
    [EBADFD]		= TARGET_EBADFD,
    [EREMCHG]		= TARGET_EREMCHG,
    [ELIBACC]		= TARGET_ELIBACC,
    [ELIBBAD]		= TARGET_ELIBBAD,
    [ELIBSCN]		= TARGET_ELIBSCN,
    [ELIBMAX]		= TARGET_ELIBMAX,
    [ELIBEXEC]		= TARGET_ELIBEXEC,
    [EILSEQ]		= TARGET_EILSEQ,
    [ENOSYS]		= TARGET_ENOSYS,
    [ELOOP]		= TARGET_ELOOP,
    [ERESTART]		= TARGET_ERESTART,
    [ESTRPIPE]		= TARGET_ESTRPIPE,
    [ENOTEMPTY]		= TARGET_ENOTEMPTY,
    [EUSERS]		= TARGET_EUSERS,
    [ENOTSOCK]		= TARGET_ENOTSOCK,
    [EDESTADDRREQ]	= TARGET_EDESTADDRREQ,
    [EMSGSIZE]		= TARGET_EMSGSIZE,
    [EPROTOTYPE]	= TARGET_EPROTOTYPE,
    [ENOPROTOOPT]	= TARGET_ENOPROTOOPT,
    [EPROTONOSUPPORT]	= TARGET_EPROTONOSUPPORT,
    [ESOCKTNOSUPPORT]	= TARGET_ESOCKTNOSUPPORT,
    [EOPNOTSUPP]	= TARGET_EOPNOTSUPP,
    [EPFNOSUPPORT]	= TARGET_EPFNOSUPPORT,
    [EAFNOSUPPORT]	= TARGET_EAFNOSUPPORT,
    [EADDRINUSE]	= TARGET_EADDRINUSE,
    [EADDRNOTAVAIL]	= TARGET_EADDRNOTAVAIL,
    [ENETDOWN]		= TARGET_ENETDOWN,
    [ENETUNREACH]	= TARGET_ENETUNREACH,
    [ENETRESET]		= TARGET_ENETRESET,
    [ECONNABORTED]	= TARGET_ECONNABORTED,
    [ECONNRESET]	= TARGET_ECONNRESET,
    [ENOBUFS]		= TARGET_ENOBUFS,
    [EISCONN]		= TARGET_EISCONN,
    [ENOTCONN]		= TARGET_ENOTCONN,
    [EUCLEAN]		= TARGET_EUCLEAN,
    [ENOTNAM]		= TARGET_ENOTNAM,
    [ENAVAIL]		= TARGET_ENAVAIL,
    [EISNAM]		= TARGET_EISNAM,
    [EREMOTEIO]		= TARGET_EREMOTEIO,
    [ESHUTDOWN]		= TARGET_ESHUTDOWN,
    [ETOOMANYREFS]	= TARGET_ETOOMANYREFS,
    [ETIMEDOUT]		= TARGET_ETIMEDOUT,
    [ECONNREFUSED]	= TARGET_ECONNREFUSED,
    [EHOSTDOWN]		= TARGET_EHOSTDOWN,
    [EHOSTUNREACH]	= TARGET_EHOSTUNREACH,
    [EALREADY]		= TARGET_EALREADY,
    [EINPROGRESS]	= TARGET_EINPROGRESS,
    [ESTALE]		= TARGET_ESTALE,
    [ECANCELED]		= TARGET_ECANCELED,
    [ENOMEDIUM]		= TARGET_ENOMEDIUM,
    [EMEDIUMTYPE]	= TARGET_EMEDIUMTYPE,
#ifdef ENOKEY
    [ENOKEY]		= TARGET_ENOKEY,
#endif
#ifdef EKEYEXPIRED
    [EKEYEXPIRED]	= TARGET_EKEYEXPIRED,
#endif
#ifdef EKEYREVOKED
    [EKEYREVOKED]	= TARGET_EKEYREVOKED,
#endif
#ifdef EKEYREJECTED
    [EKEYREJECTED]	= TARGET_EKEYREJECTED,
#endif
#ifdef EOWNERDEAD
    [EOWNERDEAD]	= TARGET_EOWNERDEAD,
#endif
#ifdef ENOTRECOVERABLE
    [ENOTRECOVERABLE]	= TARGET_ENOTRECOVERABLE,
#endif
};

static inline int host_to_target_errno(int err)
{
    if(host_to_target_errno_table[err])
        return host_to_target_errno_table[err];
    return err;
}

static inline int target_to_host_errno(int err)
{
    if (target_to_host_errno_table[err])
        return target_to_host_errno_table[err];
    return err;
}

static inline abi_long get_errno(abi_long ret)
{
    if (ret == -1)
        return -host_to_target_errno(errno);
    else
        return ret;
}

static inline int is_error(abi_long ret)
{
    return (abi_ulong)ret >= (abi_ulong)(-4096);
}

char *target_strerror(int err)
{
    return strerror(target_to_host_errno(err));
}

static abi_ulong target_brk;
static abi_ulong target_original_brk;

void target_set_brk(abi_ulong new_brk)
{
    target_original_brk = target_brk = HOST_PAGE_ALIGN(new_brk);
}

/* do_brk() must return target values and target errnos. */
abi_long do_brk(abi_ulong new_brk)
{
    abi_ulong brk_page;
    abi_long mapped_addr;
    int	new_alloc_size;

    if (!new_brk)
        return target_brk;
    if (new_brk < target_original_brk)
        return target_brk;

    brk_page = HOST_PAGE_ALIGN(target_brk);

    /* If the new brk is less than this, set it and we're done... */
    if (new_brk < brk_page) {
	target_brk = new_brk;
    	return target_brk;
    }

    /* We need to allocate more memory after the brk... */
    new_alloc_size = HOST_PAGE_ALIGN(new_brk - brk_page + 1);
    mapped_addr = get_errno(target_mmap(brk_page, new_alloc_size,
                                        PROT_READ|PROT_WRITE,
                                        MAP_ANON|MAP_FIXED|MAP_PRIVATE, 0, 0));

    if (!is_error(mapped_addr))
	target_brk = new_brk;
    
    return target_brk;
}

static inline abi_long copy_from_user_fdset(fd_set *fds,
                                            abi_ulong target_fds_addr,
                                            int n)
{
    int i, nw, j, k;
    abi_ulong b, *target_fds;

    nw = (n + TARGET_ABI_BITS - 1) / TARGET_ABI_BITS;
    if (!(target_fds = lock_user(VERIFY_READ,
                                 target_fds_addr,
                                 sizeof(abi_ulong) * nw,
                                 1)))
        return -TARGET_EFAULT;

    FD_ZERO(fds);
    k = 0;
    for (i = 0; i < nw; i++) {
        /* grab the abi_ulong */
        __get_user(b, &target_fds[i]);
        for (j = 0; j < TARGET_ABI_BITS; j++) {
            /* check the bit inside the abi_ulong */
            if ((b >> j) & 1)
                FD_SET(k, fds);
            k++;
        }
    }

    unlock_user(target_fds, target_fds_addr, 0);

    return 0;
}

static inline abi_long copy_to_user_fdset(abi_ulong target_fds_addr,
                                          const fd_set *fds,
                                          int n)
{
    int i, nw, j, k;
    abi_long v;
    abi_ulong *target_fds;

    nw = (n + TARGET_ABI_BITS - 1) / TARGET_ABI_BITS;
    if (!(target_fds = lock_user(VERIFY_WRITE,
                                 target_fds_addr,
                                 sizeof(abi_ulong) * nw,
                                 0)))
        return -TARGET_EFAULT;

    k = 0;
    for (i = 0; i < nw; i++) {
        v = 0;
        for (j = 0; j < TARGET_ABI_BITS; j++) {
            v |= ((FD_ISSET(k, fds) != 0) << j);
            k++;
        }
        __put_user(v, &target_fds[i]);
    }

    unlock_user(target_fds, target_fds_addr, sizeof(abi_ulong) * nw);

    return 0;
}

#if defined(__alpha__)
#define HOST_HZ 1024
#else
#define HOST_HZ 100
#endif

static inline abi_long host_to_target_clock_t(long ticks)
{
#if HOST_HZ == TARGET_HZ
    return ticks;
#else
    return ((int64_t)ticks * TARGET_HZ) / HOST_HZ;
#endif
}

static inline abi_long host_to_target_rusage(abi_ulong target_addr,
                                             const struct rusage *rusage)
{
    struct target_rusage *target_rusage;

    if (!lock_user_struct(VERIFY_WRITE, target_rusage, target_addr, 0))
        return -TARGET_EFAULT;
    target_rusage->ru_utime.tv_sec = tswapl(rusage->ru_utime.tv_sec);
    target_rusage->ru_utime.tv_usec = tswapl(rusage->ru_utime.tv_usec);
    target_rusage->ru_stime.tv_sec = tswapl(rusage->ru_stime.tv_sec);
    target_rusage->ru_stime.tv_usec = tswapl(rusage->ru_stime.tv_usec);
    target_rusage->ru_maxrss = tswapl(rusage->ru_maxrss);
    target_rusage->ru_ixrss = tswapl(rusage->ru_ixrss);
    target_rusage->ru_idrss = tswapl(rusage->ru_idrss);
    target_rusage->ru_isrss = tswapl(rusage->ru_isrss);
    target_rusage->ru_minflt = tswapl(rusage->ru_minflt);
    target_rusage->ru_majflt = tswapl(rusage->ru_majflt);
    target_rusage->ru_nswap = tswapl(rusage->ru_nswap);
    target_rusage->ru_inblock = tswapl(rusage->ru_inblock);
    target_rusage->ru_oublock = tswapl(rusage->ru_oublock);
    target_rusage->ru_msgsnd = tswapl(rusage->ru_msgsnd);
    target_rusage->ru_msgrcv = tswapl(rusage->ru_msgrcv);
    target_rusage->ru_nsignals = tswapl(rusage->ru_nsignals);
    target_rusage->ru_nvcsw = tswapl(rusage->ru_nvcsw);
    target_rusage->ru_nivcsw = tswapl(rusage->ru_nivcsw);
    unlock_user_struct(target_rusage, target_addr, 1);

    return 0;
}

static inline abi_long copy_from_user_timeval(struct timeval *tv,
                                              abi_ulong target_tv_addr)
{
    struct target_timeval *target_tv;

    if (!lock_user_struct(VERIFY_READ, target_tv, target_tv_addr, 1))
        return -TARGET_EFAULT;

    __get_user(tv->tv_sec, &target_tv->tv_sec);
    __get_user(tv->tv_usec, &target_tv->tv_usec);

    unlock_user_struct(target_tv, target_tv_addr, 0);

    return 0;
}

static inline abi_long copy_to_user_timeval(abi_ulong target_tv_addr,
                                            const struct timeval *tv)
{
    struct target_timeval *target_tv;

    if (!lock_user_struct(VERIFY_WRITE, target_tv, target_tv_addr, 0))
        return -TARGET_EFAULT;

    __put_user(tv->tv_sec, &target_tv->tv_sec);
    __put_user(tv->tv_usec, &target_tv->tv_usec);

    unlock_user_struct(target_tv, target_tv_addr, 1);

    return 0;
}

#if defined(TARGET_NR_mq_open) && defined(__NR_mq_open)
#include <mqueue.h>

static inline abi_long copy_from_user_mq_attr(struct mq_attr *attr,
                                              abi_ulong target_mq_attr_addr)
{
    struct target_mq_attr *target_mq_attr;

    if (!lock_user_struct(VERIFY_READ, target_mq_attr,
                          target_mq_attr_addr, 1))
        return -TARGET_EFAULT;

    __get_user(attr->mq_flags, &target_mq_attr->mq_flags);
    __get_user(attr->mq_maxmsg, &target_mq_attr->mq_maxmsg);
    __get_user(attr->mq_msgsize, &target_mq_attr->mq_msgsize);
    __get_user(attr->mq_curmsgs, &target_mq_attr->mq_curmsgs);

    unlock_user_struct(target_mq_attr, target_mq_attr_addr, 0);

    return 0;
}

static inline abi_long copy_to_user_mq_attr(abi_ulong target_mq_attr_addr,
                                            const struct mq_attr *attr)
{
    struct target_mq_attr *target_mq_attr;

    if (!lock_user_struct(VERIFY_WRITE, target_mq_attr,
                          target_mq_attr_addr, 0))
        return -TARGET_EFAULT;

    __put_user(attr->mq_flags, &target_mq_attr->mq_flags);
    __put_user(attr->mq_maxmsg, &target_mq_attr->mq_maxmsg);
    __put_user(attr->mq_msgsize, &target_mq_attr->mq_msgsize);
    __put_user(attr->mq_curmsgs, &target_mq_attr->mq_curmsgs);

    unlock_user_struct(target_mq_attr, target_mq_attr_addr, 1);

    return 0;
}
#endif

/* do_select() must return target values and target errnos. */
static abi_long do_select(int n,
                          abi_ulong rfd_addr, abi_ulong wfd_addr,
                          abi_ulong efd_addr, abi_ulong target_tv_addr)
{
    fd_set rfds, wfds, efds;
    fd_set *rfds_ptr, *wfds_ptr, *efds_ptr;
    struct timeval tv, *tv_ptr;
    abi_long ret;

    if (rfd_addr) {
        if (copy_from_user_fdset(&rfds, rfd_addr, n))
            return -TARGET_EFAULT;
        rfds_ptr = &rfds;
    } else {
        rfds_ptr = NULL;
    }
    if (wfd_addr) {
        if (copy_from_user_fdset(&wfds, wfd_addr, n))
            return -TARGET_EFAULT;
        wfds_ptr = &wfds;
    } else {
        wfds_ptr = NULL;
    }
    if (efd_addr) {
        if (copy_from_user_fdset(&efds, efd_addr, n))
            return -TARGET_EFAULT;
        efds_ptr = &efds;
    } else {
        efds_ptr = NULL;
    }

    if (target_tv_addr) {
        if (copy_from_user_timeval(&tv, target_tv_addr))
            return -TARGET_EFAULT;
        tv_ptr = &tv;
    } else {
        tv_ptr = NULL;
    }

    ret = get_errno(select(n, rfds_ptr, wfds_ptr, efds_ptr, tv_ptr));

    if (!is_error(ret)) {
        if (rfd_addr && copy_to_user_fdset(rfd_addr, &rfds, n))
            return -TARGET_EFAULT;
        if (wfd_addr && copy_to_user_fdset(wfd_addr, &wfds, n))
            return -TARGET_EFAULT;
        if (efd_addr && copy_to_user_fdset(efd_addr, &efds, n))
            return -TARGET_EFAULT;

        if (target_tv_addr && copy_to_user_timeval(target_tv_addr, &tv))
            return -TARGET_EFAULT;
    }

    return ret;
}

static abi_long do_pipe2(int host_pipe[], int flags)
{
#ifdef CONFIG_PIPE2
    return pipe2(host_pipe, flags);
#else
    return -ENOSYS;
#endif
}

static abi_long do_pipe(void *cpu_env, abi_ulong pipedes, int flags)
{
    int host_pipe[2];
    abi_long ret;
    ret = flags ? do_pipe2(host_pipe, flags) : pipe(host_pipe);

    if (is_error(ret))
        return get_errno(ret);
#if defined(TARGET_MIPS)
    ((CPUMIPSState*)cpu_env)->active_tc.gpr[3] = host_pipe[1];
    ret = host_pipe[0];
#elif defined(TARGET_SH4)
    ((CPUSH4State*)cpu_env)->gregs[1] = host_pipe[1];
    ret = host_pipe[0];
#else
    if (put_user_s32(host_pipe[0], pipedes)
        || put_user_s32(host_pipe[1], pipedes + sizeof(host_pipe[0])))
        return -TARGET_EFAULT;
#endif
    return get_errno(ret);
}

static inline abi_long target_to_host_ip_mreq(struct ip_mreqn *mreqn,
                                              abi_ulong target_addr,
                                              socklen_t len)
{
    struct target_ip_mreqn *target_smreqn;

    target_smreqn = lock_user(VERIFY_READ, target_addr, len, 1);
    if (!target_smreqn)
        return -TARGET_EFAULT;
    mreqn->imr_multiaddr.s_addr = target_smreqn->imr_multiaddr.s_addr;
    mreqn->imr_address.s_addr = target_smreqn->imr_address.s_addr;
    if (len == sizeof(struct target_ip_mreqn))
        mreqn->imr_ifindex = tswapl(target_smreqn->imr_ifindex);
    unlock_user(target_smreqn, target_addr, 0);

    return 0;
}

static inline abi_long target_to_host_sockaddr(struct sockaddr *addr,
                                               abi_ulong target_addr,
                                               socklen_t len)
{
    const socklen_t unix_maxlen = sizeof (struct sockaddr_un);
    sa_family_t sa_family;
    struct target_sockaddr *target_saddr;

    target_saddr = lock_user(VERIFY_READ, target_addr, len, 1);
    if (!target_saddr)
        return -TARGET_EFAULT;

    sa_family = tswap16(target_saddr->sa_family);

    /* Oops. The caller might send a incomplete sun_path; sun_path
     * must be terminated by \0 (see the manual page), but
     * unfortunately it is quite common to specify sockaddr_un
     * length as "strlen(x->sun_path)" while it should be
     * "strlen(...) + 1". We'll fix that here if needed.
     * Linux kernel has a similar feature.
     */

    if (sa_family == AF_UNIX) {
        if (len < unix_maxlen && len > 0) {
            char *cp = (char*)target_saddr;

            if ( cp[len-1] && !cp[len] )
                len++;
        }
        if (len > unix_maxlen)
            len = unix_maxlen;
    }

    memcpy(addr, target_saddr, len);
    addr->sa_family = sa_family;
    unlock_user(target_saddr, target_addr, 0);

    return 0;
}

static inline abi_long host_to_target_sockaddr(abi_ulong target_addr,
                                               struct sockaddr *addr,
                                               socklen_t len)
{
    struct target_sockaddr *target_saddr;

    target_saddr = lock_user(VERIFY_WRITE, target_addr, len, 0);
    if (!target_saddr)
        return -TARGET_EFAULT;
    memcpy(target_saddr, addr, len);
    target_saddr->sa_family = tswap16(addr->sa_family);
    unlock_user(target_saddr, target_addr, len);

    return 0;
}

/* ??? Should this also swap msgh->name?  */
static inline abi_long target_to_host_cmsg(struct msghdr *msgh,
                                           struct target_msghdr *target_msgh)
{
    struct cmsghdr *cmsg = CMSG_FIRSTHDR(msgh);
    abi_long msg_controllen;
    abi_ulong target_cmsg_addr;
    struct target_cmsghdr *target_cmsg;
    socklen_t space = 0;
    
    msg_controllen = tswapl(target_msgh->msg_controllen);
    if (msg_controllen < sizeof (struct target_cmsghdr)) 
        goto the_end;
    target_cmsg_addr = tswapl(target_msgh->msg_control);
    target_cmsg = lock_user(VERIFY_READ, target_cmsg_addr, msg_controllen, 1);
    if (!target_cmsg)
        return -TARGET_EFAULT;

    while (cmsg && target_cmsg) {
        void *data = CMSG_DATA(cmsg);
        void *target_data = TARGET_CMSG_DATA(target_cmsg);

        int len = tswapl(target_cmsg->cmsg_len)
                  - TARGET_CMSG_ALIGN(sizeof (struct target_cmsghdr));

        space += CMSG_SPACE(len);
        if (space > msgh->msg_controllen) {
            space -= CMSG_SPACE(len);
            gemu_log("Host cmsg overflow\n");
            break;
        }

        cmsg->cmsg_level = tswap32(target_cmsg->cmsg_level);
        cmsg->cmsg_type = tswap32(target_cmsg->cmsg_type);
        cmsg->cmsg_len = CMSG_LEN(len);

        if (cmsg->cmsg_level != TARGET_SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) {
            gemu_log("Unsupported ancillary data: %d/%d\n", cmsg->cmsg_level, cmsg->cmsg_type);
            memcpy(data, target_data, len);
        } else {
            int *fd = (int *)data;
            int *target_fd = (int *)target_data;
            int i, numfds = len / sizeof(int);

            for (i = 0; i < numfds; i++)
                fd[i] = tswap32(target_fd[i]);
        }

        cmsg = CMSG_NXTHDR(msgh, cmsg);
        target_cmsg = TARGET_CMSG_NXTHDR(target_msgh, target_cmsg);
    }
    unlock_user(target_cmsg, target_cmsg_addr, 0);
 the_end:
    msgh->msg_controllen = space;
    return 0;
}

/* ??? Should this also swap msgh->name?  */
static inline abi_long host_to_target_cmsg(struct target_msghdr *target_msgh,
                                           struct msghdr *msgh)
{
    struct cmsghdr *cmsg = CMSG_FIRSTHDR(msgh);
    abi_long msg_controllen;
    abi_ulong target_cmsg_addr;
    struct target_cmsghdr *target_cmsg;
    socklen_t space = 0;

    msg_controllen = tswapl(target_msgh->msg_controllen);
    if (msg_controllen < sizeof (struct target_cmsghdr)) 
        goto the_end;
    target_cmsg_addr = tswapl(target_msgh->msg_control);
    target_cmsg = lock_user(VERIFY_WRITE, target_cmsg_addr, msg_controllen, 0);
    if (!target_cmsg)
        return -TARGET_EFAULT;

    while (cmsg && target_cmsg) {
        void *data = CMSG_DATA(cmsg);
        void *target_data = TARGET_CMSG_DATA(target_cmsg);

        int len = cmsg->cmsg_len - CMSG_ALIGN(sizeof (struct cmsghdr));

        space += TARGET_CMSG_SPACE(len);
        if (space > msg_controllen) {
            space -= TARGET_CMSG_SPACE(len);
            gemu_log("Target cmsg overflow\n");
            break;
        }

        target_cmsg->cmsg_level = tswap32(cmsg->cmsg_level);
        target_cmsg->cmsg_type = tswap32(cmsg->cmsg_type);
        target_cmsg->cmsg_len = tswapl(TARGET_CMSG_LEN(len));

        if (cmsg->cmsg_level != TARGET_SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) {
            gemu_log("Unsupported ancillary data: %d/%d\n", cmsg->cmsg_level, cmsg->cmsg_type);
            memcpy(target_data, data, len);
        } else {
            int *fd = (int *)data;
            int *target_fd = (int *)target_data;
            int i, numfds = len / sizeof(int);

            for (i = 0; i < numfds; i++)
                target_fd[i] = tswap32(fd[i]);
        }

        cmsg = CMSG_NXTHDR(msgh, cmsg);
        target_cmsg = TARGET_CMSG_NXTHDR(target_msgh, target_cmsg);
    }
    unlock_user(target_cmsg, target_cmsg_addr, space);
 the_end:
    target_msgh->msg_controllen = tswapl(space);
    return 0;
}

/* do_setsockopt() Must return target values and target errnos. */
static abi_long do_setsockopt(int sockfd, int level, int optname,
                              abi_ulong optval_addr, socklen_t optlen)
{
    abi_long ret;
    int val;
    struct ip_mreqn *ip_mreq;
    struct ip_mreq_source *ip_mreq_source;

    switch(level) {
    case SOL_TCP:
        /* TCP options all take an 'int' value.  */
        if (optlen < sizeof(uint32_t))
            return -TARGET_EINVAL;

        if (get_user_u32(val, optval_addr))
            return -TARGET_EFAULT;
        ret = get_errno(setsockopt(sockfd, level, optname, &val, sizeof(val)));
        break;
    case SOL_IP:
        switch(optname) {
        case IP_TOS:
        case IP_TTL:
        case IP_HDRINCL:
        case IP_ROUTER_ALERT:
        case IP_RECVOPTS:
        case IP_RETOPTS:
        case IP_PKTINFO:
        case IP_MTU_DISCOVER:
        case IP_RECVERR:
        case IP_RECVTOS:
#ifdef IP_FREEBIND
        case IP_FREEBIND:
#endif
        case IP_MULTICAST_TTL:
        case IP_MULTICAST_LOOP:
            val = 0;
            if (optlen >= sizeof(uint32_t)) {
                if (get_user_u32(val, optval_addr))
                    return -TARGET_EFAULT;
            } else if (optlen >= 1) {
                if (get_user_u8(val, optval_addr))
                    return -TARGET_EFAULT;
            }
            ret = get_errno(setsockopt(sockfd, level, optname, &val, sizeof(val)));
            break;
        case IP_ADD_MEMBERSHIP:
        case IP_DROP_MEMBERSHIP:
            if (optlen < sizeof (struct target_ip_mreq) ||
                optlen > sizeof (struct target_ip_mreqn))
                return -TARGET_EINVAL;

            ip_mreq = (struct ip_mreqn *) alloca(optlen);
            target_to_host_ip_mreq(ip_mreq, optval_addr, optlen);
            ret = get_errno(setsockopt(sockfd, level, optname, ip_mreq, optlen));
            break;

        case IP_BLOCK_SOURCE:
        case IP_UNBLOCK_SOURCE:
        case IP_ADD_SOURCE_MEMBERSHIP:
        case IP_DROP_SOURCE_MEMBERSHIP:
            if (optlen != sizeof (struct target_ip_mreq_source))
                return -TARGET_EINVAL;

            ip_mreq_source = lock_user(VERIFY_READ, optval_addr, optlen, 1);
            ret = get_errno(setsockopt(sockfd, level, optname, ip_mreq_source, optlen));
            unlock_user (ip_mreq_source, optval_addr, 0);
            break;

        default:
            goto unimplemented;
        }
        break;
    case TARGET_SOL_SOCKET:
        switch (optname) {
            /* Options with 'int' argument.  */
        case TARGET_SO_DEBUG:
		optname = SO_DEBUG;
		break;
        case TARGET_SO_REUSEADDR:
		optname = SO_REUSEADDR;
		break;
        case TARGET_SO_TYPE:
		optname = SO_TYPE;
		break;
        case TARGET_SO_ERROR:
		optname = SO_ERROR;
		break;
        case TARGET_SO_DONTROUTE:
		optname = SO_DONTROUTE;
		break;
        case TARGET_SO_BROADCAST:
		optname = SO_BROADCAST;
		break;
        case TARGET_SO_SNDBUF:
		optname = SO_SNDBUF;
		break;
        case TARGET_SO_RCVBUF:
		optname = SO_RCVBUF;
		break;
        case TARGET_SO_KEEPALIVE:
		optname = SO_KEEPALIVE;
		break;
        case TARGET_SO_OOBINLINE:
		optname = SO_OOBINLINE;
		break;
        case TARGET_SO_NO_CHECK:
		optname = SO_NO_CHECK;
		break;
        case TARGET_SO_PRIORITY:
		optname = SO_PRIORITY;
		break;
#ifdef SO_BSDCOMPAT
        case TARGET_SO_BSDCOMPAT:
		optname = SO_BSDCOMPAT;
		break;
#endif
        case TARGET_SO_PASSCRED:
		optname = SO_PASSCRED;
		break;
        case TARGET_SO_TIMESTAMP:
		optname = SO_TIMESTAMP;
		break;
        case TARGET_SO_RCVLOWAT:
		optname = SO_RCVLOWAT;
		break;
        case TARGET_SO_RCVTIMEO:
		optname = SO_RCVTIMEO;
		break;
        case TARGET_SO_SNDTIMEO:
		optname = SO_SNDTIMEO;
		break;
            break;
        default:
            goto unimplemented;
        }
	if (optlen < sizeof(uint32_t))
            return -TARGET_EINVAL;

	if (get_user_u32(val, optval_addr))
            return -TARGET_EFAULT;
	ret = get_errno(setsockopt(sockfd, SOL_SOCKET, optname, &val, sizeof(val)));
        break;
    default:
    unimplemented:
        gemu_log("Unsupported setsockopt level=%d optname=%d \n", level, optname);
        ret = -TARGET_ENOPROTOOPT;
    }
    return ret;
}

/* do_getsockopt() Must return target values and target errnos. */
static abi_long do_getsockopt(int sockfd, int level, int optname,
                              abi_ulong optval_addr, abi_ulong optlen)
{
    abi_long ret;
    int len, val;
    socklen_t lv;

    switch(level) {
    case TARGET_SOL_SOCKET:
    	level = SOL_SOCKET;
	switch (optname) {
	case TARGET_SO_LINGER:
	case TARGET_SO_RCVTIMEO:
	case TARGET_SO_SNDTIMEO:
	case TARGET_SO_PEERCRED:
	case TARGET_SO_PEERNAME:
	    /* These don't just return a single integer */
	    goto unimplemented;
        default:
            goto int_case;
        }
        break;
    case SOL_TCP:
        /* TCP options all take an 'int' value.  */
    int_case:
        if (get_user_u32(len, optlen))
            return -TARGET_EFAULT;
        if (len < 0)
            return -TARGET_EINVAL;
        lv = sizeof(int);
        ret = get_errno(getsockopt(sockfd, level, optname, &val, &lv));
        if (ret < 0)
            return ret;
        if (len > lv)
            len = lv;
        if (len == 4) {
            if (put_user_u32(val, optval_addr))
                return -TARGET_EFAULT;
        } else {
            if (put_user_u8(val, optval_addr))
                return -TARGET_EFAULT;
	}
        if (put_user_u32(len, optlen))
            return -TARGET_EFAULT;
        break;
    case SOL_IP:
        switch(optname) {
        case IP_TOS:
        case IP_TTL:
        case IP_HDRINCL:
        case IP_ROUTER_ALERT:
        case IP_RECVOPTS:
        case IP_RETOPTS:
        case IP_PKTINFO:
        case IP_MTU_DISCOVER:
        case IP_RECVERR:
        case IP_RECVTOS:
#ifdef IP_FREEBIND
        case IP_FREEBIND:
#endif
        case IP_MULTICAST_TTL:
        case IP_MULTICAST_LOOP:
            if (get_user_u32(len, optlen))
                return -TARGET_EFAULT;
            if (len < 0)
                return -TARGET_EINVAL;
            lv = sizeof(int);
            ret = get_errno(getsockopt(sockfd, level, optname, &val, &lv));
            if (ret < 0)
                return ret;
            if (len < sizeof(int) && len > 0 && val >= 0 && val < 255) {
                len = 1;
                if (put_user_u32(len, optlen)
                    || put_user_u8(val, optval_addr))
                    return -TARGET_EFAULT;
            } else {
                if (len > sizeof(int))
                    len = sizeof(int);
                if (put_user_u32(len, optlen)
                    || put_user_u32(val, optval_addr))
                    return -TARGET_EFAULT;
            }
            break;
        default:
            ret = -TARGET_ENOPROTOOPT;
            break;
        }
        break;
    default:
    unimplemented:
        gemu_log("getsockopt level=%d optname=%d not yet supported\n",
                 level, optname);
        ret = -TARGET_EOPNOTSUPP;
        break;
    }
    return ret;
}

/* FIXME
 * lock_iovec()/unlock_iovec() have a return code of 0 for success where
 * other lock functions have a return code of 0 for failure.
 */
static abi_long lock_iovec(int type, struct iovec *vec, abi_ulong target_addr,
                           int count, int copy)
{
    struct target_iovec *target_vec;
    abi_ulong base;
    int i;

    target_vec = lock_user(VERIFY_READ, target_addr, count * sizeof(struct target_iovec), 1);
    if (!target_vec)
        return -TARGET_EFAULT;
    for(i = 0;i < count; i++) {
        base = tswapl(target_vec[i].iov_base);
        vec[i].iov_len = tswapl(target_vec[i].iov_len);
        if (vec[i].iov_len != 0) {
            vec[i].iov_base = lock_user(type, base, vec[i].iov_len, copy);
            /* Don't check lock_user return value. We must call writev even
               if a element has invalid base address. */
        } else {
            /* zero length pointer is ignored */
            vec[i].iov_base = NULL;
        }
    }
    unlock_user (target_vec, target_addr, 0);
    return 0;
}

static abi_long unlock_iovec(struct iovec *vec, abi_ulong target_addr,
                             int count, int copy)
{
    struct target_iovec *target_vec;
    abi_ulong base;
    int i;

    target_vec = lock_user(VERIFY_READ, target_addr, count * sizeof(struct target_iovec), 1);
    if (!target_vec)
        return -TARGET_EFAULT;
    for(i = 0;i < count; i++) {
        if (target_vec[i].iov_base) {
            base = tswapl(target_vec[i].iov_base);
            unlock_user(vec[i].iov_base, base, copy ? vec[i].iov_len : 0);
        }
    }
    unlock_user (target_vec, target_addr, 0);

    return 0;
}

/* do_socket() Must return target values and target errnos. */
static abi_long do_socket(int domain, int type, int protocol)
{
#if defined(TARGET_MIPS)
    switch(type) {
    case TARGET_SOCK_DGRAM:
        type = SOCK_DGRAM;
        break;
    case TARGET_SOCK_STREAM:
        type = SOCK_STREAM;
        break;
    case TARGET_SOCK_RAW:
        type = SOCK_RAW;
        break;
    case TARGET_SOCK_RDM:
        type = SOCK_RDM;
        break;
    case TARGET_SOCK_SEQPACKET:
        type = SOCK_SEQPACKET;
        break;
    case TARGET_SOCK_PACKET:
        type = SOCK_PACKET;
        break;
    }
#endif
    if (domain == PF_NETLINK)
        return -EAFNOSUPPORT; /* do not NETLINK socket connections possible */
    return get_errno(socket(domain, type, protocol));
}

/* do_bind() Must return target values and target errnos. */
static abi_long do_bind(int sockfd, abi_ulong target_addr,
                        socklen_t addrlen)
{
    void *addr;
    abi_long ret;

    if (addrlen < 0)
        return -TARGET_EINVAL;

    addr = alloca(addrlen+1);

    ret = target_to_host_sockaddr(addr, target_addr, addrlen);
    if (ret)
        return ret;

    return get_errno(bind(sockfd, addr, addrlen));
}

/* do_connect() Must return target values and target errnos. */
static abi_long do_connect(int sockfd, abi_ulong target_addr,
                           socklen_t addrlen)
{
    void *addr;
    abi_long ret;

    if (addrlen < 0)
        return -TARGET_EINVAL;

    addr = alloca(addrlen);

    ret = target_to_host_sockaddr(addr, target_addr, addrlen);
    if (ret)
        return ret;

    return get_errno(connect(sockfd, addr, addrlen));
}

/* do_sendrecvmsg() Must return target values and target errnos. */
static abi_long do_sendrecvmsg(int fd, abi_ulong target_msg,
                               int flags, int send)
{
    abi_long ret, len;
    struct target_msghdr *msgp;
    struct msghdr msg;
    int count;
    struct iovec *vec;
    abi_ulong target_vec;

    /* FIXME */
    if (!lock_user_struct(send ? VERIFY_READ : VERIFY_WRITE,
                          msgp,
                          target_msg,
                          send ? 1 : 0))
        return -TARGET_EFAULT;
    if (msgp->msg_name) {
        msg.msg_namelen = tswap32(msgp->msg_namelen);
        msg.msg_name = alloca(msg.msg_namelen);
        ret = target_to_host_sockaddr(msg.msg_name, tswapl(msgp->msg_name),
                                msg.msg_namelen);
        if (ret) {
            unlock_user_struct(msgp, target_msg, send ? 0 : 1);
            return ret;
        }
    } else {
        msg.msg_name = NULL;
        msg.msg_namelen = 0;
    }
    msg.msg_controllen = 2 * tswapl(msgp->msg_controllen);
    msg.msg_control = alloca(msg.msg_controllen);
    msg.msg_flags = tswap32(msgp->msg_flags);

    count = tswapl(msgp->msg_iovlen);
    vec = alloca(count * sizeof(struct iovec));
    target_vec = tswapl(msgp->msg_iov);
    lock_iovec(send ? VERIFY_READ : VERIFY_WRITE, vec, target_vec, count, send);
    msg.msg_iovlen = count;
    msg.msg_iov = vec;

    if (send) {
        ret = target_to_host_cmsg(&msg, msgp);
        if (ret == 0)
            ret = get_errno(sendmsg(fd, &msg, flags));
    } else {
        ret = get_errno(recvmsg(fd, &msg, flags));
        if (!is_error(ret)) {
            len = ret;
            ret = host_to_target_cmsg(msgp, &msg);
            if (!is_error(ret))
                ret = len;
        }
    }
    unlock_iovec(vec, target_vec, count, !send);
    unlock_user_struct(msgp, target_msg, send ? 0 : 1);
    return ret;
}

/* do_accept() Must return target values and target errnos. */
static abi_long do_accept(int fd, abi_ulong target_addr,
                          abi_ulong target_addrlen_addr)
{
    socklen_t addrlen;
    void *addr;
    abi_long ret;

    if (target_addr == 0)
       return get_errno(accept(fd, NULL, NULL));

    /* linux returns EINVAL if addrlen pointer is invalid */
    if (get_user_u32(addrlen, target_addrlen_addr))
        return -TARGET_EINVAL;

    if (addrlen < 0)
        return -TARGET_EINVAL;

    if (!access_ok(VERIFY_WRITE, target_addr, addrlen))
        return -TARGET_EINVAL;

    addr = alloca(addrlen);

    ret = get_errno(accept(fd, addr, &addrlen));
    if (!is_error(ret)) {
        host_to_target_sockaddr(target_addr, addr, addrlen);
        if (put_user_u32(addrlen, target_addrlen_addr))
            ret = -TARGET_EFAULT;
    }
    return ret;
}

/* do_getpeername() Must return target values and target errnos. */
static abi_long do_getpeername(int fd, abi_ulong target_addr,
                               abi_ulong target_addrlen_addr)
{
    socklen_t addrlen;
    void *addr;
    abi_long ret;

    if (get_user_u32(addrlen, target_addrlen_addr))
        return -TARGET_EFAULT;

    if (addrlen < 0)
        return -TARGET_EINVAL;

    if (!access_ok(VERIFY_WRITE, target_addr, addrlen))
        return -TARGET_EFAULT;

    addr = alloca(addrlen);

    ret = get_errno(getpeername(fd, addr, &addrlen));
    if (!is_error(ret)) {
        host_to_target_sockaddr(target_addr, addr, addrlen);
        if (put_user_u32(addrlen, target_addrlen_addr))
            ret = -TARGET_EFAULT;
    }
    return ret;
}

/* do_getsockname() Must return target values and target errnos. */
static abi_long do_getsockname(int fd, abi_ulong target_addr,
                               abi_ulong target_addrlen_addr)
{
    socklen_t addrlen;
    void *addr;
    abi_long ret;

    if (get_user_u32(addrlen, target_addrlen_addr))
        return -TARGET_EFAULT;

    if (addrlen < 0)
        return -TARGET_EINVAL;

    if (!access_ok(VERIFY_WRITE, target_addr, addrlen))
        return -TARGET_EFAULT;

    addr = alloca(addrlen);

    ret = get_errno(getsockname(fd, addr, &addrlen));
    if (!is_error(ret)) {
        host_to_target_sockaddr(target_addr, addr, addrlen);
        if (put_user_u32(addrlen, target_addrlen_addr))
            ret = -TARGET_EFAULT;
    }
    return ret;
}

/* do_socketpair() Must return target values and target errnos. */
static abi_long do_socketpair(int domain, int type, int protocol,
                              abi_ulong target_tab_addr)
{
    int tab[2];
    abi_long ret;

    ret = get_errno(socketpair(domain, type, protocol, tab));
    if (!is_error(ret)) {
        if (put_user_s32(tab[0], target_tab_addr)
            || put_user_s32(tab[1], target_tab_addr + sizeof(tab[0])))
            ret = -TARGET_EFAULT;
    }
    return ret;
}

/* do_sendto() Must return target values and target errnos. */
static abi_long do_sendto(int fd, abi_ulong msg, size_t len, int flags,
                          abi_ulong target_addr, socklen_t addrlen)
{
    void *addr;
    void *host_msg;
    abi_long ret;

    if (addrlen < 0)
        return -TARGET_EINVAL;

    host_msg = lock_user(VERIFY_READ, msg, len, 1);
    if (!host_msg)
        return -TARGET_EFAULT;
    if (target_addr) {
        addr = alloca(addrlen);
        ret = target_to_host_sockaddr(addr, target_addr, addrlen);
        if (ret) {
            unlock_user(host_msg, msg, 0);
            return ret;
        }
        ret = get_errno(sendto(fd, host_msg, len, flags, addr, addrlen));
    } else {
        ret = get_errno(send(fd, host_msg, len, flags));
    }
    unlock_user(host_msg, msg, 0);
    return ret;
}

/* do_recvfrom() Must return target values and target errnos. */
static abi_long do_recvfrom(int fd, abi_ulong msg, size_t len, int flags,
                            abi_ulong target_addr,
                            abi_ulong target_addrlen)
{
    socklen_t addrlen;
    void *addr;
    void *host_msg;
    abi_long ret;

    host_msg = lock_user(VERIFY_WRITE, msg, len, 0);
    if (!host_msg)
        return -TARGET_EFAULT;
    if (target_addr) {
        if (get_user_u32(addrlen, target_addrlen)) {
            ret = -TARGET_EFAULT;
            goto fail;
        }
        if (addrlen < 0) {
            ret = -TARGET_EINVAL;
            goto fail;
        }
        addr = alloca(addrlen);
        ret = get_errno(recvfrom(fd, host_msg, len, flags, addr, &addrlen));
    } else {
        addr = NULL; /* To keep compiler quiet.  */
        ret = get_errno(recv(fd, host_msg, len, flags));
    }
    if (!is_error(ret)) {
        if (target_addr) {
            host_to_target_sockaddr(target_addr, addr, addrlen);
            if (put_user_u32(addrlen, target_addrlen)) {
                ret = -TARGET_EFAULT;
                goto fail;
            }
        }
        unlock_user(host_msg, msg, len);
    } else {
fail:
        unlock_user(host_msg, msg, 0);
    }
    return ret;
}

#ifdef TARGET_NR_socketcall
/* do_socketcall() Must return target values and target errnos. */
static abi_long do_socketcall(int num, abi_ulong vptr)
{
    abi_long ret;
    const int n = sizeof(abi_ulong);

    switch(num) {
    case SOCKOP_socket:
	{
            abi_ulong domain, type, protocol;

            if (get_user_ual(domain, vptr)
                || get_user_ual(type, vptr + n)
                || get_user_ual(protocol, vptr + 2 * n))
                return -TARGET_EFAULT;

            ret = do_socket(domain, type, protocol);
	}
        break;
    case SOCKOP_bind:
	{
            abi_ulong sockfd;
            abi_ulong target_addr;
            socklen_t addrlen;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(target_addr, vptr + n)
                || get_user_ual(addrlen, vptr + 2 * n))
                return -TARGET_EFAULT;

            ret = do_bind(sockfd, target_addr, addrlen);
        }
        break;
    case SOCKOP_connect:
        {
            abi_ulong sockfd;
            abi_ulong target_addr;
            socklen_t addrlen;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(target_addr, vptr + n)
                || get_user_ual(addrlen, vptr + 2 * n))
                return -TARGET_EFAULT;

            ret = do_connect(sockfd, target_addr, addrlen);
        }
        break;
    case SOCKOP_listen:
        {
            abi_ulong sockfd, backlog;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(backlog, vptr + n))
                return -TARGET_EFAULT;

            ret = get_errno(listen(sockfd, backlog));
        }
        break;
    case SOCKOP_accept:
        {
            abi_ulong sockfd;
            abi_ulong target_addr, target_addrlen;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(target_addr, vptr + n)
                || get_user_ual(target_addrlen, vptr + 2 * n))
                return -TARGET_EFAULT;

            ret = do_accept(sockfd, target_addr, target_addrlen);
        }
        break;
    case SOCKOP_getsockname:
        {
            abi_ulong sockfd;
            abi_ulong target_addr, target_addrlen;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(target_addr, vptr + n)
                || get_user_ual(target_addrlen, vptr + 2 * n))
                return -TARGET_EFAULT;

            ret = do_getsockname(sockfd, target_addr, target_addrlen);
        }
        break;
    case SOCKOP_getpeername:
        {
            abi_ulong sockfd;
            abi_ulong target_addr, target_addrlen;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(target_addr, vptr + n)
                || get_user_ual(target_addrlen, vptr + 2 * n))
                return -TARGET_EFAULT;

            ret = do_getpeername(sockfd, target_addr, target_addrlen);
        }
        break;
    case SOCKOP_socketpair:
        {
            abi_ulong domain, type, protocol;
            abi_ulong tab;

            if (get_user_ual(domain, vptr)
                || get_user_ual(type, vptr + n)
                || get_user_ual(protocol, vptr + 2 * n)
                || get_user_ual(tab, vptr + 3 * n))
                return -TARGET_EFAULT;

            ret = do_socketpair(domain, type, protocol, tab);
        }
        break;
    case SOCKOP_send:
        {
            abi_ulong sockfd;
            abi_ulong msg;
            size_t len;
            abi_ulong flags;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(msg, vptr + n)
                || get_user_ual(len, vptr + 2 * n)
                || get_user_ual(flags, vptr + 3 * n))
                return -TARGET_EFAULT;

            ret = do_sendto(sockfd, msg, len, flags, 0, 0);
        }
        break;
    case SOCKOP_recv:
        {
            abi_ulong sockfd;
            abi_ulong msg;
            size_t len;
            abi_ulong flags;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(msg, vptr + n)
                || get_user_ual(len, vptr + 2 * n)
                || get_user_ual(flags, vptr + 3 * n))
                return -TARGET_EFAULT;

            ret = do_recvfrom(sockfd, msg, len, flags, 0, 0);
        }
        break;
    case SOCKOP_sendto:
        {
            abi_ulong sockfd;
            abi_ulong msg;
            size_t len;
            abi_ulong flags;
            abi_ulong addr;
            socklen_t addrlen;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(msg, vptr + n)
                || get_user_ual(len, vptr + 2 * n)
                || get_user_ual(flags, vptr + 3 * n)
                || get_user_ual(addr, vptr + 4 * n)
                || get_user_ual(addrlen, vptr + 5 * n))
                return -TARGET_EFAULT;

            ret = do_sendto(sockfd, msg, len, flags, addr, addrlen);
        }
        break;
    case SOCKOP_recvfrom:
        {
            abi_ulong sockfd;
            abi_ulong msg;
            size_t len;
            abi_ulong flags;
            abi_ulong addr;
            socklen_t addrlen;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(msg, vptr + n)
                || get_user_ual(len, vptr + 2 * n)
                || get_user_ual(flags, vptr + 3 * n)
                || get_user_ual(addr, vptr + 4 * n)
                || get_user_ual(addrlen, vptr + 5 * n))
                return -TARGET_EFAULT;

            ret = do_recvfrom(sockfd, msg, len, flags, addr, addrlen);
        }
        break;
    case SOCKOP_shutdown:
        {
            abi_ulong sockfd, how;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(how, vptr + n))
                return -TARGET_EFAULT;

            ret = get_errno(shutdown(sockfd, how));
        }
        break;
    case SOCKOP_sendmsg:
    case SOCKOP_recvmsg:
        {
            abi_ulong fd;
            abi_ulong target_msg;
            abi_ulong flags;

            if (get_user_ual(fd, vptr)
                || get_user_ual(target_msg, vptr + n)
                || get_user_ual(flags, vptr + 2 * n))
                return -TARGET_EFAULT;

            ret = do_sendrecvmsg(fd, target_msg, flags,
                                 (num == SOCKOP_sendmsg));
        }
        break;
    case SOCKOP_setsockopt:
        {
            abi_ulong sockfd;
            abi_ulong level;
            abi_ulong optname;
            abi_ulong optval;
            socklen_t optlen;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(level, vptr + n)
                || get_user_ual(optname, vptr + 2 * n)
                || get_user_ual(optval, vptr + 3 * n)
                || get_user_ual(optlen, vptr + 4 * n))
                return -TARGET_EFAULT;

            ret = do_setsockopt(sockfd, level, optname, optval, optlen);
        }
        break;
    case SOCKOP_getsockopt:
        {
            abi_ulong sockfd;
            abi_ulong level;
            abi_ulong optname;
            abi_ulong optval;
            socklen_t optlen;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(level, vptr + n)
                || get_user_ual(optname, vptr + 2 * n)
                || get_user_ual(optval, vptr + 3 * n)
                || get_user_ual(optlen, vptr + 4 * n))
                return -TARGET_EFAULT;

            ret = do_getsockopt(sockfd, level, optname, optval, optlen);
        }
        break;
    default:
        gemu_log("Unsupported socketcall: %d\n", num);
        ret = -TARGET_ENOSYS;
        break;
    }
    return ret;
}
#endif

#define N_SHM_REGIONS	32

static struct shm_region {
    abi_ulong	start;
    abi_ulong	size;
} shm_regions[N_SHM_REGIONS];

struct target_ipc_perm
{
    abi_long __key;
    abi_ulong uid;
    abi_ulong gid;
    abi_ulong cuid;
    abi_ulong cgid;
    unsigned short int mode;
    unsigned short int __pad1;
    unsigned short int __seq;
    unsigned short int __pad2;
    abi_ulong __unused1;
    abi_ulong __unused2;
};

struct target_semid_ds
{
  struct target_ipc_perm sem_perm;
  abi_ulong sem_otime;
  abi_ulong __unused1;
  abi_ulong sem_ctime;
  abi_ulong __unused2;
  abi_ulong sem_nsems;
  abi_ulong __unused3;
  abi_ulong __unused4;
};

static inline abi_long target_to_host_ipc_perm(struct ipc_perm *host_ip,
                                               abi_ulong target_addr)
{
    struct target_ipc_perm *target_ip;
    struct target_semid_ds *target_sd;

    if (!lock_user_struct(VERIFY_READ, target_sd, target_addr, 1))
        return -TARGET_EFAULT;
    target_ip = &(target_sd->sem_perm);
    host_ip->__key = tswapl(target_ip->__key);
    host_ip->uid = tswapl(target_ip->uid);
    host_ip->gid = tswapl(target_ip->gid);
    host_ip->cuid = tswapl(target_ip->cuid);
    host_ip->cgid = tswapl(target_ip->cgid);
    host_ip->mode = tswapl(target_ip->mode);
    unlock_user_struct(target_sd, target_addr, 0);
    return 0;
}

static inline abi_long host_to_target_ipc_perm(abi_ulong target_addr,
                                               struct ipc_perm *host_ip)
{
    struct target_ipc_perm *target_ip;
    struct target_semid_ds *target_sd;

    if (!lock_user_struct(VERIFY_WRITE, target_sd, target_addr, 0))
        return -TARGET_EFAULT;
    target_ip = &(target_sd->sem_perm);
    target_ip->__key = tswapl(host_ip->__key);
    target_ip->uid = tswapl(host_ip->uid);
    target_ip->gid = tswapl(host_ip->gid);
    target_ip->cuid = tswapl(host_ip->cuid);
    target_ip->cgid = tswapl(host_ip->cgid);
    target_ip->mode = tswapl(host_ip->mode);
    unlock_user_struct(target_sd, target_addr, 1);
    return 0;
}

static inline abi_long target_to_host_semid_ds(struct semid_ds *host_sd,
                                               abi_ulong target_addr)
{
    struct target_semid_ds *target_sd;

    if (!lock_user_struct(VERIFY_READ, target_sd, target_addr, 1))
        return -TARGET_EFAULT;
    if (target_to_host_ipc_perm(&(host_sd->sem_perm),target_addr))
        return -TARGET_EFAULT;
    host_sd->sem_nsems = tswapl(target_sd->sem_nsems);
    host_sd->sem_otime = tswapl(target_sd->sem_otime);
    host_sd->sem_ctime = tswapl(target_sd->sem_ctime);
    unlock_user_struct(target_sd, target_addr, 0);
    return 0;
}

static inline abi_long host_to_target_semid_ds(abi_ulong target_addr,
                                               struct semid_ds *host_sd)
{
    struct target_semid_ds *target_sd;

    if (!lock_user_struct(VERIFY_WRITE, target_sd, target_addr, 0))
        return -TARGET_EFAULT;
    if (host_to_target_ipc_perm(target_addr,&(host_sd->sem_perm)))
        return -TARGET_EFAULT;;
    target_sd->sem_nsems = tswapl(host_sd->sem_nsems);
    target_sd->sem_otime = tswapl(host_sd->sem_otime);
    target_sd->sem_ctime = tswapl(host_sd->sem_ctime);
    unlock_user_struct(target_sd, target_addr, 1);
    return 0;
}

struct target_seminfo {
    int semmap;
    int semmni;
    int semmns;
    int semmnu;
    int semmsl;
    int semopm;
    int semume;
    int semusz;
    int semvmx;
    int semaem;
};

static inline abi_long host_to_target_seminfo(abi_ulong target_addr,
                                              struct seminfo *host_seminfo)
{
    struct target_seminfo *target_seminfo;
    if (!lock_user_struct(VERIFY_WRITE, target_seminfo, target_addr, 0))
        return -TARGET_EFAULT;
    __put_user(host_seminfo->semmap, &target_seminfo->semmap);
    __put_user(host_seminfo->semmni, &target_seminfo->semmni);
    __put_user(host_seminfo->semmns, &target_seminfo->semmns);
    __put_user(host_seminfo->semmnu, &target_seminfo->semmnu);
    __put_user(host_seminfo->semmsl, &target_seminfo->semmsl);
    __put_user(host_seminfo->semopm, &target_seminfo->semopm);
    __put_user(host_seminfo->semume, &target_seminfo->semume);
    __put_user(host_seminfo->semusz, &target_seminfo->semusz);
    __put_user(host_seminfo->semvmx, &target_seminfo->semvmx);
    __put_user(host_seminfo->semaem, &target_seminfo->semaem);
    unlock_user_struct(target_seminfo, target_addr, 1);
    return 0;
}

union semun {
	int val;
	struct semid_ds *buf;
	unsigned short *array;
	struct seminfo *__buf;
};

union target_semun {
	int val;
	abi_ulong buf;
	abi_ulong array;
	abi_ulong __buf;
};

static inline abi_long target_to_host_semarray(int semid, unsigned short **host_array,
                                               abi_ulong target_addr)
{
    int nsems;
    unsigned short *array;
    union semun semun;
    struct semid_ds semid_ds;
    int i, ret;

    semun.buf = &semid_ds;

    ret = semctl(semid, 0, IPC_STAT, semun);
    if (ret == -1)
        return get_errno(ret);

    nsems = semid_ds.sem_nsems;

    *host_array = malloc(nsems*sizeof(unsigned short));
    array = lock_user(VERIFY_READ, target_addr,
                      nsems*sizeof(unsigned short), 1);
    if (!array)
        return -TARGET_EFAULT;

    for(i=0; i<nsems; i++) {
        __get_user((*host_array)[i], &array[i]);
    }
    unlock_user(array, target_addr, 0);

    return 0;
}

static inline abi_long host_to_target_semarray(int semid, abi_ulong target_addr,
                                               unsigned short **host_array)
{
    int nsems;
    unsigned short *array;
    union semun semun;
    struct semid_ds semid_ds;
    int i, ret;

    semun.buf = &semid_ds;

    ret = semctl(semid, 0, IPC_STAT, semun);
    if (ret == -1)
        return get_errno(ret);

    nsems = semid_ds.sem_nsems;

    array = lock_user(VERIFY_WRITE, target_addr,
                      nsems*sizeof(unsigned short), 0);
    if (!array)
        return -TARGET_EFAULT;

    for(i=0; i<nsems; i++) {
        __put_user((*host_array)[i], &array[i]);
    }
    free(*host_array);
    unlock_user(array, target_addr, 1);

    return 0;
}

static inline abi_long do_semctl(int semid, int semnum, int cmd,
                                 union target_semun target_su)
{
    union semun arg;
    struct semid_ds dsarg;
    unsigned short *array = NULL;
    struct seminfo seminfo;
    abi_long ret = -TARGET_EINVAL;
    abi_long err;
    cmd &= 0xff;

    switch( cmd ) {
	case GETVAL:
	case SETVAL:
            arg.val = tswapl(target_su.val);
            ret = get_errno(semctl(semid, semnum, cmd, arg));
            target_su.val = tswapl(arg.val);
            break;
	case GETALL:
	case SETALL:
            err = target_to_host_semarray(semid, &array, target_su.array);
            if (err)
                return err;
            arg.array = array;
            ret = get_errno(semctl(semid, semnum, cmd, arg));
            err = host_to_target_semarray(semid, target_su.array, &array);
            if (err)
                return err;
            break;
	case IPC_STAT:
	case IPC_SET:
	case SEM_STAT:
            err = target_to_host_semid_ds(&dsarg, target_su.buf);
            if (err)
                return err;
            arg.buf = &dsarg;
            ret = get_errno(semctl(semid, semnum, cmd, arg));
            err = host_to_target_semid_ds(target_su.buf, &dsarg);
            if (err)
                return err;
            break;
	case IPC_INFO:
	case SEM_INFO:
            arg.__buf = &seminfo;
            ret = get_errno(semctl(semid, semnum, cmd, arg));
            err = host_to_target_seminfo(target_su.__buf, &seminfo);
            if (err)
                return err;
            break;
	case IPC_RMID:
	case GETPID:
	case GETNCNT:
	case GETZCNT:
            ret = get_errno(semctl(semid, semnum, cmd, NULL));
            break;
    }

    return ret;
}

struct target_sembuf {
    unsigned short sem_num;
    short sem_op;
    short sem_flg;
};

static inline abi_long target_to_host_sembuf(struct sembuf *host_sembuf,
                                             abi_ulong target_addr,
                                             unsigned nsops)
{
    struct target_sembuf *target_sembuf;
    int i;

    target_sembuf = lock_user(VERIFY_READ, target_addr,
                              nsops*sizeof(struct target_sembuf), 1);
    if (!target_sembuf)
        return -TARGET_EFAULT;

    for(i=0; i<nsops; i++) {
        __get_user(host_sembuf[i].sem_num, &target_sembuf[i].sem_num);
        __get_user(host_sembuf[i].sem_op, &target_sembuf[i].sem_op);
        __get_user(host_sembuf[i].sem_flg, &target_sembuf[i].sem_flg);
    }

    unlock_user(target_sembuf, target_addr, 0);

    return 0;
}

static inline abi_long do_semop(int semid, abi_long ptr, unsigned nsops)
{
    struct sembuf sops[nsops];

    if (target_to_host_sembuf(sops, ptr, nsops))
        return -TARGET_EFAULT;

    return semop(semid, sops, nsops);
}

struct target_msqid_ds
{
    struct target_ipc_perm msg_perm;
    abi_ulong msg_stime;
#if TARGET_ABI_BITS == 32
    abi_ulong __unused1;
#endif
    abi_ulong msg_rtime;
#if TARGET_ABI_BITS == 32
    abi_ulong __unused2;
#endif
    abi_ulong msg_ctime;
#if TARGET_ABI_BITS == 32
    abi_ulong __unused3;
#endif
    abi_ulong __msg_cbytes;
    abi_ulong msg_qnum;
    abi_ulong msg_qbytes;
    abi_ulong msg_lspid;
    abi_ulong msg_lrpid;
    abi_ulong __unused4;
    abi_ulong __unused5;
};

static inline abi_long target_to_host_msqid_ds(struct msqid_ds *host_md,
                                               abi_ulong target_addr)
{
    struct target_msqid_ds *target_md;

    if (!lock_user_struct(VERIFY_READ, target_md, target_addr, 1))
        return -TARGET_EFAULT;
    if (target_to_host_ipc_perm(&(host_md->msg_perm),target_addr))
        return -TARGET_EFAULT;
    host_md->msg_stime = tswapl(target_md->msg_stime);
    host_md->msg_rtime = tswapl(target_md->msg_rtime);
    host_md->msg_ctime = tswapl(target_md->msg_ctime);
    host_md->__msg_cbytes = tswapl(target_md->__msg_cbytes);
    host_md->msg_qnum = tswapl(target_md->msg_qnum);
    host_md->msg_qbytes = tswapl(target_md->msg_qbytes);
    host_md->msg_lspid = tswapl(target_md->msg_lspid);
    host_md->msg_lrpid = tswapl(target_md->msg_lrpid);
    unlock_user_struct(target_md, target_addr, 0);
    return 0;
}

static inline abi_long host_to_target_msqid_ds(abi_ulong target_addr,
                                               struct msqid_ds *host_md)
{
    struct target_msqid_ds *target_md;

    if (!lock_user_struct(VERIFY_WRITE, target_md, target_addr, 0))
        return -TARGET_EFAULT;
    if (host_to_target_ipc_perm(target_addr,&(host_md->msg_perm)))
        return -TARGET_EFAULT;
    target_md->msg_stime = tswapl(host_md->msg_stime);
    target_md->msg_rtime = tswapl(host_md->msg_rtime);
    target_md->msg_ctime = tswapl(host_md->msg_ctime);
    target_md->__msg_cbytes = tswapl(host_md->__msg_cbytes);
    target_md->msg_qnum = tswapl(host_md->msg_qnum);
    target_md->msg_qbytes = tswapl(host_md->msg_qbytes);
    target_md->msg_lspid = tswapl(host_md->msg_lspid);
    target_md->msg_lrpid = tswapl(host_md->msg_lrpid);
    unlock_user_struct(target_md, target_addr, 1);
    return 0;
}

struct target_msginfo {
    int msgpool;
    int msgmap;
    int msgmax;
    int msgmnb;
    int msgmni;
    int msgssz;
    int msgtql;
    unsigned short int msgseg;
};

static inline abi_long host_to_target_msginfo(abi_ulong target_addr,
                                              struct msginfo *host_msginfo)
{
    struct target_msginfo *target_msginfo;
    if (!lock_user_struct(VERIFY_WRITE, target_msginfo, target_addr, 0))
        return -TARGET_EFAULT;
    __put_user(host_msginfo->msgpool, &target_msginfo->msgpool);
    __put_user(host_msginfo->msgmap, &target_msginfo->msgmap);
    __put_user(host_msginfo->msgmax, &target_msginfo->msgmax);
    __put_user(host_msginfo->msgmnb, &target_msginfo->msgmnb);
    __put_user(host_msginfo->msgmni, &target_msginfo->msgmni);
    __put_user(host_msginfo->msgssz, &target_msginfo->msgssz);
    __put_user(host_msginfo->msgtql, &target_msginfo->msgtql);
    __put_user(host_msginfo->msgseg, &target_msginfo->msgseg);
    unlock_user_struct(target_msginfo, target_addr, 1);
    return 0;
}

static inline abi_long do_msgctl(int msgid, int cmd, abi_long ptr)
{
    struct msqid_ds dsarg;
    struct msginfo msginfo;
    abi_long ret = -TARGET_EINVAL;

    cmd &= 0xff;

    switch (cmd) {
    case IPC_STAT:
    case IPC_SET:
    case MSG_STAT:
        if (target_to_host_msqid_ds(&dsarg,ptr))
            return -TARGET_EFAULT;
        ret = get_errno(msgctl(msgid, cmd, &dsarg));
        if (host_to_target_msqid_ds(ptr,&dsarg))
            return -TARGET_EFAULT;
        break;
    case IPC_RMID:
        ret = get_errno(msgctl(msgid, cmd, NULL));
        break;
    case IPC_INFO:
    case MSG_INFO:
        ret = get_errno(msgctl(msgid, cmd, (struct msqid_ds *)&msginfo));
        if (host_to_target_msginfo(ptr, &msginfo))
            return -TARGET_EFAULT;
        break;
    }

    return ret;
}

struct target_msgbuf {
    abi_long mtype;
    char	mtext[1];
};

static inline abi_long do_msgsnd(int msqid, abi_long msgp,
                                 unsigned int msgsz, int msgflg)
{
    struct target_msgbuf *target_mb;
    struct msgbuf *host_mb;
    abi_long ret = 0;

    if (!lock_user_struct(VERIFY_READ, target_mb, msgp, 0))
        return -TARGET_EFAULT;
    host_mb = malloc(msgsz+sizeof(long));
    host_mb->mtype = (abi_long) tswapl(target_mb->mtype);
    memcpy(host_mb->mtext, target_mb->mtext, msgsz);
    ret = get_errno(msgsnd(msqid, host_mb, msgsz, msgflg));
    free(host_mb);
    unlock_user_struct(target_mb, msgp, 0);

    return ret;
}

static inline abi_long do_msgrcv(int msqid, abi_long msgp,
                                 unsigned int msgsz, abi_long msgtyp,
                                 int msgflg)
{
    struct target_msgbuf *target_mb;
    char *target_mtext;
    struct msgbuf *host_mb;
    abi_long ret = 0;

    if (!lock_user_struct(VERIFY_WRITE, target_mb, msgp, 0))
        return -TARGET_EFAULT;

    host_mb = malloc(msgsz+sizeof(long));
    ret = get_errno(msgrcv(msqid, host_mb, msgsz, tswapl(msgtyp), msgflg));

    if (ret > 0) {
        abi_ulong target_mtext_addr = msgp + sizeof(abi_ulong);
        target_mtext = lock_user(VERIFY_WRITE, target_mtext_addr, ret, 0);
        if (!target_mtext) {
            ret = -TARGET_EFAULT;
            goto end;
        }
        memcpy(target_mb->mtext, host_mb->mtext, ret);
        unlock_user(target_mtext, target_mtext_addr, ret);
    }

    target_mb->mtype = tswapl(host_mb->mtype);
    free(host_mb);

end:
    if (target_mb)
        unlock_user_struct(target_mb, msgp, 1);
    return ret;
}

struct target_shmid_ds
{
    struct target_ipc_perm shm_perm;
    abi_ulong shm_segsz;
    abi_ulong shm_atime;
#if TARGET_ABI_BITS == 32
    abi_ulong __unused1;
#endif
    abi_ulong shm_dtime;
#if TARGET_ABI_BITS == 32
    abi_ulong __unused2;
#endif
    abi_ulong shm_ctime;
#if TARGET_ABI_BITS == 32
    abi_ulong __unused3;
#endif
    int shm_cpid;
    int shm_lpid;
    abi_ulong shm_nattch;
    unsigned long int __unused4;
    unsigned long int __unused5;
};

static inline abi_long target_to_host_shmid_ds(struct shmid_ds *host_sd,
                                               abi_ulong target_addr)
{
    struct target_shmid_ds *target_sd;

    if (!lock_user_struct(VERIFY_READ, target_sd, target_addr, 1))
        return -TARGET_EFAULT;
    if (target_to_host_ipc_perm(&(host_sd->shm_perm), target_addr))
        return -TARGET_EFAULT;
    __get_user(host_sd->shm_segsz, &target_sd->shm_segsz);
    __get_user(host_sd->shm_atime, &target_sd->shm_atime);
    __get_user(host_sd->shm_dtime, &target_sd->shm_dtime);
    __get_user(host_sd->shm_ctime, &target_sd->shm_ctime);
    __get_user(host_sd->shm_cpid, &target_sd->shm_cpid);
    __get_user(host_sd->shm_lpid, &target_sd->shm_lpid);
    __get_user(host_sd->shm_nattch, &target_sd->shm_nattch);
    unlock_user_struct(target_sd, target_addr, 0);
    return 0;
}

static inline abi_long host_to_target_shmid_ds(abi_ulong target_addr,
                                               struct shmid_ds *host_sd)
{
    struct target_shmid_ds *target_sd;

    if (!lock_user_struct(VERIFY_WRITE, target_sd, target_addr, 0))
        return -TARGET_EFAULT;
    if (host_to_target_ipc_perm(target_addr, &(host_sd->shm_perm)))
        return -TARGET_EFAULT;
    __put_user(host_sd->shm_segsz, &target_sd->shm_segsz);
    __put_user(host_sd->shm_atime, &target_sd->shm_atime);
    __put_user(host_sd->shm_dtime, &target_sd->shm_dtime);
    __put_user(host_sd->shm_ctime, &target_sd->shm_ctime);
    __put_user(host_sd->shm_cpid, &target_sd->shm_cpid);
    __put_user(host_sd->shm_lpid, &target_sd->shm_lpid);
    __put_user(host_sd->shm_nattch, &target_sd->shm_nattch);
    unlock_user_struct(target_sd, target_addr, 1);
    return 0;
}

struct  target_shminfo {
    abi_ulong shmmax;
    abi_ulong shmmin;
    abi_ulong shmmni;
    abi_ulong shmseg;
    abi_ulong shmall;
};

static inline abi_long host_to_target_shminfo(abi_ulong target_addr,
                                              struct shminfo *host_shminfo)
{
    struct target_shminfo *target_shminfo;
    if (!lock_user_struct(VERIFY_WRITE, target_shminfo, target_addr, 0))
        return -TARGET_EFAULT;
    __put_user(host_shminfo->shmmax, &target_shminfo->shmmax);
    __put_user(host_shminfo->shmmin, &target_shminfo->shmmin);
    __put_user(host_shminfo->shmmni, &target_shminfo->shmmni);
    __put_user(host_shminfo->shmseg, &target_shminfo->shmseg);
    __put_user(host_shminfo->shmall, &target_shminfo->shmall);
    unlock_user_struct(target_shminfo, target_addr, 1);
    return 0;
}

struct target_shm_info {
    int used_ids;
    abi_ulong shm_tot;
    abi_ulong shm_rss;
    abi_ulong shm_swp;
    abi_ulong swap_attempts;
    abi_ulong swap_successes;
};

static inline abi_long host_to_target_shm_info(abi_ulong target_addr,
                                               struct shm_info *host_shm_info)
{
    struct target_shm_info *target_shm_info;
    if (!lock_user_struct(VERIFY_WRITE, target_shm_info, target_addr, 0))
        return -TARGET_EFAULT;
    __put_user(host_shm_info->used_ids, &target_shm_info->used_ids);
    __put_user(host_shm_info->shm_tot, &target_shm_info->shm_tot);
    __put_user(host_shm_info->shm_rss, &target_shm_info->shm_rss);
    __put_user(host_shm_info->shm_swp, &target_shm_info->shm_swp);
    __put_user(host_shm_info->swap_attempts, &target_shm_info->swap_attempts);
    __put_user(host_shm_info->swap_successes, &target_shm_info->swap_successes);
    unlock_user_struct(target_shm_info, target_addr, 1);
    return 0;
}

static inline abi_long do_shmctl(int shmid, int cmd, abi_long buf)
{
    struct shmid_ds dsarg;
    struct shminfo shminfo;
    struct shm_info shm_info;
    abi_long ret = -TARGET_EINVAL;

    cmd &= 0xff;

    switch(cmd) {
    case IPC_STAT:
    case IPC_SET:
    case SHM_STAT:
        if (target_to_host_shmid_ds(&dsarg, buf))
            return -TARGET_EFAULT;
        ret = get_errno(shmctl(shmid, cmd, &dsarg));
        if (host_to_target_shmid_ds(buf, &dsarg))
            return -TARGET_EFAULT;
        break;
    case IPC_INFO:
        ret = get_errno(shmctl(shmid, cmd, (struct shmid_ds *)&shminfo));
        if (host_to_target_shminfo(buf, &shminfo))
            return -TARGET_EFAULT;
        break;
    case SHM_INFO:
        ret = get_errno(shmctl(shmid, cmd, (struct shmid_ds *)&shm_info));
        if (host_to_target_shm_info(buf, &shm_info))
            return -TARGET_EFAULT;
        break;
    case IPC_RMID:
    case SHM_LOCK:
    case SHM_UNLOCK:
        ret = get_errno(shmctl(shmid, cmd, NULL));
        break;
    }

    return ret;
}

static inline abi_ulong do_shmat(int shmid, abi_ulong shmaddr, int shmflg)
{
    abi_long raddr;
    void *host_raddr;
    struct shmid_ds shm_info;
    int i,ret;

    /* find out the length of the shared memory segment */
    ret = get_errno(shmctl(shmid, IPC_STAT, &shm_info));
    if (is_error(ret)) {
        /* can't get length, bail out */
        return ret;
    }

    mmap_lock();

    if (shmaddr)
        host_raddr = shmat(shmid, (void *)g2h(shmaddr), shmflg);
    else {
        abi_ulong mmap_start;

        mmap_start = mmap_find_vma(0, shm_info.shm_segsz);

        if (mmap_start == -1) {
            errno = ENOMEM;
            host_raddr = (void *)-1;
        } else
            host_raddr = shmat(shmid, g2h(mmap_start), shmflg | SHM_REMAP);
    }

    if (host_raddr == (void *)-1) {
        mmap_unlock();
        return get_errno((long)host_raddr);
    }
    raddr=h2g((unsigned long)host_raddr);

    page_set_flags(raddr, raddr + shm_info.shm_segsz,
                   PAGE_VALID | PAGE_READ |
                   ((shmflg & SHM_RDONLY)? 0 : PAGE_WRITE));

    for (i = 0; i < N_SHM_REGIONS; i++) {
        if (shm_regions[i].start == 0) {
            shm_regions[i].start = raddr;
            shm_regions[i].size = shm_info.shm_segsz;
            break;
        }
    }

    mmap_unlock();
    return raddr;

}

static inline abi_long do_shmdt(abi_ulong shmaddr)
{
    int i;

    for (i = 0; i < N_SHM_REGIONS; ++i) {
        if (shm_regions[i].start == shmaddr) {
            shm_regions[i].start = 0;
            page_set_flags(shmaddr, shm_regions[i].size, 0);
            break;
        }
    }

    return get_errno(shmdt(g2h(shmaddr)));
}

#ifdef TARGET_NR_ipc
/* ??? This only works with linear mappings.  */
/* do_ipc() must return target values and target errnos. */
static abi_long do_ipc(unsigned int call, int first,
                       int second, int third,
                       abi_long ptr, abi_long fifth)
{
    int version;
    abi_long ret = 0;

    version = call >> 16;
    call &= 0xffff;

    switch (call) {
    case IPCOP_semop:
        ret = do_semop(first, ptr, second);
        break;

    case IPCOP_semget:
        ret = get_errno(semget(first, second, third));
        break;

    case IPCOP_semctl:
        ret = do_semctl(first, second, third, (union target_semun)(abi_ulong) ptr);
        break;

    case IPCOP_msgget:
        ret = get_errno(msgget(first, second));
        break;

    case IPCOP_msgsnd:
        ret = do_msgsnd(first, ptr, second, third);
        break;

    case IPCOP_msgctl:
        ret = do_msgctl(first, second, ptr);
        break;

    case IPCOP_msgrcv:
        switch (version) {
        case 0:
            {
                struct target_ipc_kludge {
                    abi_long msgp;
                    abi_long msgtyp;
                } *tmp;

                if (!lock_user_struct(VERIFY_READ, tmp, ptr, 1)) {
                    ret = -TARGET_EFAULT;
                    break;
                }

                ret = do_msgrcv(first, tmp->msgp, second, tmp->msgtyp, third);

                unlock_user_struct(tmp, ptr, 0);
                break;
            }
        default:
            ret = do_msgrcv(first, ptr, second, fifth, third);
        }
        break;

    case IPCOP_shmat:
        switch (version) {
        default:
        {
            abi_ulong raddr;
            raddr = do_shmat(first, ptr, second);
            if (is_error(raddr))
                return get_errno(raddr);
            if (put_user_ual(raddr, third))
                return -TARGET_EFAULT;
            break;
        }
        case 1:
            ret = -TARGET_EINVAL;
            break;
        }
	break;
    case IPCOP_shmdt:
        ret = do_shmdt(ptr);
	break;

    case IPCOP_shmget:
	/* IPC_* flag values are the same on all linux platforms */
	ret = get_errno(shmget(first, second, third));
	break;

	/* IPC_* and SHM_* command values are the same on all linux platforms */
    case IPCOP_shmctl:
        ret = do_shmctl(first, second, third);
        break;
    default:
	gemu_log("Unsupported ipc call: %d (version %d)\n", call, version);
	ret = -TARGET_ENOSYS;
	break;
    }
    return ret;
}
#endif

/* kernel structure types definitions */
#define IFNAMSIZ        16

#define STRUCT(name, ...) STRUCT_ ## name,
#define STRUCT_SPECIAL(name) STRUCT_ ## name,
enum {
#include "syscall_types.h"
};
#undef STRUCT
#undef STRUCT_SPECIAL

#define STRUCT(name, ...) static const argtype struct_ ## name ## _def[] = {  __VA_ARGS__, TYPE_NULL };
#define STRUCT_SPECIAL(name)
#include "syscall_types.h"
#undef STRUCT
#undef STRUCT_SPECIAL

typedef struct IOCTLEntry {
    unsigned int target_cmd;
    unsigned int host_cmd;
    const char *name;
    int access;
    const argtype arg_type[5];
} IOCTLEntry;

#define IOC_R 0x0001
#define IOC_W 0x0002
#define IOC_RW (IOC_R | IOC_W)

#define MAX_STRUCT_SIZE 4096

static IOCTLEntry ioctl_entries[] = {
#define IOCTL(cmd, access, ...) \
    { TARGET_ ## cmd, cmd, #cmd, access, {  __VA_ARGS__ } },
#include "ioctls.h"
    { 0, 0, },
};

/* ??? Implement proper locking for ioctls.  */
/* do_ioctl() Must return target values and target errnos. */
static abi_long do_ioctl(int fd, abi_long cmd, abi_long arg)
{
    const IOCTLEntry *ie;
    const argtype *arg_type;
    abi_long ret;
    uint8_t buf_temp[MAX_STRUCT_SIZE];
    int target_size;
    void *argptr;

    ie = ioctl_entries;
    for(;;) {
        if (ie->target_cmd == 0) {
            gemu_log("Unsupported ioctl: cmd=0x%04lx\n", (long)cmd);
            return -TARGET_ENOSYS;
        }
        if (ie->target_cmd == cmd)
            break;
        ie++;
    }
    arg_type = ie->arg_type;
#if defined(DEBUG)
    gemu_log("ioctl: cmd=0x%04lx (%s)\n", (long)cmd, ie->name);
#endif
    switch(arg_type[0]) {
    case TYPE_NULL:
        /* no argument */
        ret = get_errno(ioctl(fd, ie->host_cmd));
        break;
    case TYPE_PTRVOID:
    case TYPE_INT:
        /* int argment */
        ret = get_errno(ioctl(fd, ie->host_cmd, arg));
        break;
    case TYPE_PTR:
        arg_type++;
        target_size = thunk_type_size(arg_type, 0);
        switch(ie->access) {
        case IOC_R:
            ret = get_errno(ioctl(fd, ie->host_cmd, buf_temp));
            if (!is_error(ret)) {
                argptr = lock_user(VERIFY_WRITE, arg, target_size, 0);
                if (!argptr)
                    return -TARGET_EFAULT;
                thunk_convert(argptr, buf_temp, arg_type, THUNK_TARGET);
                unlock_user(argptr, arg, target_size);
            }
            break;
        case IOC_W:
            argptr = lock_user(VERIFY_READ, arg, target_size, 1);
            if (!argptr)
                return -TARGET_EFAULT;
            thunk_convert(buf_temp, argptr, arg_type, THUNK_HOST);
            unlock_user(argptr, arg, 0);
            ret = get_errno(ioctl(fd, ie->host_cmd, buf_temp));
            break;
        default:
        case IOC_RW:
            argptr = lock_user(VERIFY_READ, arg, target_size, 1);
            if (!argptr)
                return -TARGET_EFAULT;
            thunk_convert(buf_temp, argptr, arg_type, THUNK_HOST);
            unlock_user(argptr, arg, 0);
            ret = get_errno(ioctl(fd, ie->host_cmd, buf_temp));
            if (!is_error(ret)) {
                argptr = lock_user(VERIFY_WRITE, arg, target_size, 0);
                if (!argptr)
                    return -TARGET_EFAULT;
                thunk_convert(argptr, buf_temp, arg_type, THUNK_TARGET);
                unlock_user(argptr, arg, target_size);
            }
            break;
        }
        break;
    default:
        gemu_log("Unsupported ioctl type: cmd=0x%04lx type=%d\n",
                 (long)cmd, arg_type[0]);
        ret = -TARGET_ENOSYS;
        break;
    }
    return ret;
}

static const bitmask_transtbl iflag_tbl[] = {
        { TARGET_IGNBRK, TARGET_IGNBRK, IGNBRK, IGNBRK },
        { TARGET_BRKINT, TARGET_BRKINT, BRKINT, BRKINT },
        { TARGET_IGNPAR, TARGET_IGNPAR, IGNPAR, IGNPAR },
        { TARGET_PARMRK, TARGET_PARMRK, PARMRK, PARMRK },
        { TARGET_INPCK, TARGET_INPCK, INPCK, INPCK },
        { TARGET_ISTRIP, TARGET_ISTRIP, ISTRIP, ISTRIP },
        { TARGET_INLCR, TARGET_INLCR, INLCR, INLCR },
        { TARGET_IGNCR, TARGET_IGNCR, IGNCR, IGNCR },
        { TARGET_ICRNL, TARGET_ICRNL, ICRNL, ICRNL },
        { TARGET_IUCLC, TARGET_IUCLC, IUCLC, IUCLC },
        { TARGET_IXON, TARGET_IXON, IXON, IXON },
        { TARGET_IXANY, TARGET_IXANY, IXANY, IXANY },
        { TARGET_IXOFF, TARGET_IXOFF, IXOFF, IXOFF },
        { TARGET_IMAXBEL, TARGET_IMAXBEL, IMAXBEL, IMAXBEL },
        { 0, 0, 0, 0 }
};

static const bitmask_transtbl oflag_tbl[] = {
	{ TARGET_OPOST, TARGET_OPOST, OPOST, OPOST },
	{ TARGET_OLCUC, TARGET_OLCUC, OLCUC, OLCUC },
	{ TARGET_ONLCR, TARGET_ONLCR, ONLCR, ONLCR },
	{ TARGET_OCRNL, TARGET_OCRNL, OCRNL, OCRNL },
	{ TARGET_ONOCR, TARGET_ONOCR, ONOCR, ONOCR },
	{ TARGET_ONLRET, TARGET_ONLRET, ONLRET, ONLRET },
	{ TARGET_OFILL, TARGET_OFILL, OFILL, OFILL },
	{ TARGET_OFDEL, TARGET_OFDEL, OFDEL, OFDEL },
	{ TARGET_NLDLY, TARGET_NL0, NLDLY, NL0 },
	{ TARGET_NLDLY, TARGET_NL1, NLDLY, NL1 },
	{ TARGET_CRDLY, TARGET_CR0, CRDLY, CR0 },
	{ TARGET_CRDLY, TARGET_CR1, CRDLY, CR1 },
	{ TARGET_CRDLY, TARGET_CR2, CRDLY, CR2 },
	{ TARGET_CRDLY, TARGET_CR3, CRDLY, CR3 },
	{ TARGET_TABDLY, TARGET_TAB0, TABDLY, TAB0 },
	{ TARGET_TABDLY, TARGET_TAB1, TABDLY, TAB1 },
	{ TARGET_TABDLY, TARGET_TAB2, TABDLY, TAB2 },
	{ TARGET_TABDLY, TARGET_TAB3, TABDLY, TAB3 },
	{ TARGET_BSDLY, TARGET_BS0, BSDLY, BS0 },
	{ TARGET_BSDLY, TARGET_BS1, BSDLY, BS1 },
	{ TARGET_VTDLY, TARGET_VT0, VTDLY, VT0 },
	{ TARGET_VTDLY, TARGET_VT1, VTDLY, VT1 },
	{ TARGET_FFDLY, TARGET_FF0, FFDLY, FF0 },
	{ TARGET_FFDLY, TARGET_FF1, FFDLY, FF1 },
	{ 0, 0, 0, 0 }
};

static const bitmask_transtbl cflag_tbl[] = {
	{ TARGET_CBAUD, TARGET_B0, CBAUD, B0 },
	{ TARGET_CBAUD, TARGET_B50, CBAUD, B50 },
	{ TARGET_CBAUD, TARGET_B75, CBAUD, B75 },
	{ TARGET_CBAUD, TARGET_B110, CBAUD, B110 },
	{ TARGET_CBAUD, TARGET_B134, CBAUD, B134 },
	{ TARGET_CBAUD, TARGET_B150, CBAUD, B150 },
	{ TARGET_CBAUD, TARGET_B200, CBAUD, B200 },
	{ TARGET_CBAUD, TARGET_B300, CBAUD, B300 },
	{ TARGET_CBAUD, TARGET_B600, CBAUD, B600 },
	{ TARGET_CBAUD, TARGET_B1200, CBAUD, B1200 },
	{ TARGET_CBAUD, TARGET_B1800, CBAUD, B1800 },
	{ TARGET_CBAUD, TARGET_B2400, CBAUD, B2400 },
	{ TARGET_CBAUD, TARGET_B4800, CBAUD, B4800 },
	{ TARGET_CBAUD, TARGET_B9600, CBAUD, B9600 },
	{ TARGET_CBAUD, TARGET_B19200, CBAUD, B19200 },
	{ TARGET_CBAUD, TARGET_B38400, CBAUD, B38400 },
	{ TARGET_CBAUD, TARGET_B57600, CBAUD, B57600 },
	{ TARGET_CBAUD, TARGET_B115200, CBAUD, B115200 },
	{ TARGET_CBAUD, TARGET_B230400, CBAUD, B230400 },
	{ TARGET_CBAUD, TARGET_B460800, CBAUD, B460800 },
	{ TARGET_CSIZE, TARGET_CS5, CSIZE, CS5 },
	{ TARGET_CSIZE, TARGET_CS6, CSIZE, CS6 },
	{ TARGET_CSIZE, TARGET_CS7, CSIZE, CS7 },
	{ TARGET_CSIZE, TARGET_CS8, CSIZE, CS8 },
	{ TARGET_CSTOPB, TARGET_CSTOPB, CSTOPB, CSTOPB },
	{ TARGET_CREAD, TARGET_CREAD, CREAD, CREAD },
	{ TARGET_PARENB, TARGET_PARENB, PARENB, PARENB },
	{ TARGET_PARODD, TARGET_PARODD, PARODD, PARODD },
	{ TARGET_HUPCL, TARGET_HUPCL, HUPCL, HUPCL },
	{ TARGET_CLOCAL, TARGET_CLOCAL, CLOCAL, CLOCAL },
	{ TARGET_CRTSCTS, TARGET_CRTSCTS, CRTSCTS, CRTSCTS },
	{ 0, 0, 0, 0 }
};

static const bitmask_transtbl lflag_tbl[] = {
	{ TARGET_ISIG, TARGET_ISIG, ISIG, ISIG },
	{ TARGET_ICANON, TARGET_ICANON, ICANON, ICANON },
	{ TARGET_XCASE, TARGET_XCASE, XCASE, XCASE },
	{ TARGET_ECHO, TARGET_ECHO, ECHO, ECHO },
	{ TARGET_ECHOE, TARGET_ECHOE, ECHOE, ECHOE },
	{ TARGET_ECHOK, TARGET_ECHOK, ECHOK, ECHOK },
	{ TARGET_ECHONL, TARGET_ECHONL, ECHONL, ECHONL },
	{ TARGET_NOFLSH, TARGET_NOFLSH, NOFLSH, NOFLSH },
	{ TARGET_TOSTOP, TARGET_TOSTOP, TOSTOP, TOSTOP },
	{ TARGET_ECHOCTL, TARGET_ECHOCTL, ECHOCTL, ECHOCTL },
	{ TARGET_ECHOPRT, TARGET_ECHOPRT, ECHOPRT, ECHOPRT },
	{ TARGET_ECHOKE, TARGET_ECHOKE, ECHOKE, ECHOKE },
	{ TARGET_FLUSHO, TARGET_FLUSHO, FLUSHO, FLUSHO },
	{ TARGET_PENDIN, TARGET_PENDIN, PENDIN, PENDIN },
	{ TARGET_IEXTEN, TARGET_IEXTEN, IEXTEN, IEXTEN },
	{ 0, 0, 0, 0 }
};

static void target_to_host_termios (void *dst, const void *src)
{
    struct host_termios *host = dst;
    const struct target_termios *target = src;

    host->c_iflag =
        target_to_host_bitmask(tswap32(target->c_iflag), iflag_tbl);
    host->c_oflag =
        target_to_host_bitmask(tswap32(target->c_oflag), oflag_tbl);
    host->c_cflag =
        target_to_host_bitmask(tswap32(target->c_cflag), cflag_tbl);
    host->c_lflag =
        target_to_host_bitmask(tswap32(target->c_lflag), lflag_tbl);
    host->c_line = target->c_line;

    memset(host->c_cc, 0, sizeof(host->c_cc));
    host->c_cc[VINTR] = target->c_cc[TARGET_VINTR];
    host->c_cc[VQUIT] = target->c_cc[TARGET_VQUIT];
    host->c_cc[VERASE] = target->c_cc[TARGET_VERASE];
    host->c_cc[VKILL] = target->c_cc[TARGET_VKILL];
    host->c_cc[VEOF] = target->c_cc[TARGET_VEOF];
    host->c_cc[VTIME] = target->c_cc[TARGET_VTIME];
    host->c_cc[VMIN] = target->c_cc[TARGET_VMIN];
    host->c_cc[VSWTC] = target->c_cc[TARGET_VSWTC];
    host->c_cc[VSTART] = target->c_cc[TARGET_VSTART];
    host->c_cc[VSTOP] = target->c_cc[TARGET_VSTOP];
    host->c_cc[VSUSP] = target->c_cc[TARGET_VSUSP];
    host->c_cc[VEOL] = target->c_cc[TARGET_VEOL];
    host->c_cc[VREPRINT] = target->c_cc[TARGET_VREPRINT];
    host->c_cc[VDISCARD] = target->c_cc[TARGET_VDISCARD];
    host->c_cc[VWERASE] = target->c_cc[TARGET_VWERASE];
    host->c_cc[VLNEXT] = target->c_cc[TARGET_VLNEXT];
    host->c_cc[VEOL2] = target->c_cc[TARGET_VEOL2];
}

static void host_to_target_termios (void *dst, const void *src)
{
    struct target_termios *target = dst;
    const struct host_termios *host = src;

    target->c_iflag =
        tswap32(host_to_target_bitmask(host->c_iflag, iflag_tbl));
    target->c_oflag =
        tswap32(host_to_target_bitmask(host->c_oflag, oflag_tbl));
    target->c_cflag =
        tswap32(host_to_target_bitmask(host->c_cflag, cflag_tbl));
    target->c_lflag =
        tswap32(host_to_target_bitmask(host->c_lflag, lflag_tbl));
    target->c_line = host->c_line;

    memset(target->c_cc, 0, sizeof(target->c_cc));
    target->c_cc[TARGET_VINTR] = host->c_cc[VINTR];
    target->c_cc[TARGET_VQUIT] = host->c_cc[VQUIT];
    target->c_cc[TARGET_VERASE] = host->c_cc[VERASE];
    target->c_cc[TARGET_VKILL] = host->c_cc[VKILL];
    target->c_cc[TARGET_VEOF] = host->c_cc[VEOF];
    target->c_cc[TARGET_VTIME] = host->c_cc[VTIME];
    target->c_cc[TARGET_VMIN] = host->c_cc[VMIN];
    target->c_cc[TARGET_VSWTC] = host->c_cc[VSWTC];
    target->c_cc[TARGET_VSTART] = host->c_cc[VSTART];
    target->c_cc[TARGET_VSTOP] = host->c_cc[VSTOP];
    target->c_cc[TARGET_VSUSP] = host->c_cc[VSUSP];
    target->c_cc[TARGET_VEOL] = host->c_cc[VEOL];
    target->c_cc[TARGET_VREPRINT] = host->c_cc[VREPRINT];
    target->c_cc[TARGET_VDISCARD] = host->c_cc[VDISCARD];
    target->c_cc[TARGET_VWERASE] = host->c_cc[VWERASE];
    target->c_cc[TARGET_VLNEXT] = host->c_cc[VLNEXT];
    target->c_cc[TARGET_VEOL2] = host->c_cc[VEOL2];
}

static const StructEntry struct_termios_def = {
    .convert = { host_to_target_termios, target_to_host_termios },
    .size = { sizeof(struct target_termios), sizeof(struct host_termios) },
    .align = { __alignof__(struct target_termios), __alignof__(struct host_termios) },
};

static bitmask_transtbl mmap_flags_tbl[] = {
	{ TARGET_MAP_SHARED, TARGET_MAP_SHARED, MAP_SHARED, MAP_SHARED },
	{ TARGET_MAP_PRIVATE, TARGET_MAP_PRIVATE, MAP_PRIVATE, MAP_PRIVATE },
	{ TARGET_MAP_FIXED, TARGET_MAP_FIXED, MAP_FIXED, MAP_FIXED },
	{ TARGET_MAP_ANONYMOUS, TARGET_MAP_ANONYMOUS, MAP_ANONYMOUS, MAP_ANONYMOUS },
	{ TARGET_MAP_GROWSDOWN, TARGET_MAP_GROWSDOWN, MAP_GROWSDOWN, MAP_GROWSDOWN },
	{ TARGET_MAP_DENYWRITE, TARGET_MAP_DENYWRITE, MAP_DENYWRITE, MAP_DENYWRITE },
	{ TARGET_MAP_EXECUTABLE, TARGET_MAP_EXECUTABLE, MAP_EXECUTABLE, MAP_EXECUTABLE },
	{ TARGET_MAP_LOCKED, TARGET_MAP_LOCKED, MAP_LOCKED, MAP_LOCKED },
	{ 0, 0, 0, 0 }
};

#if defined(TARGET_I386)

/* NOTE: there is really one LDT for all the threads */
static uint8_t *ldt_table;

static abi_long read_ldt(abi_ulong ptr, unsigned long bytecount)
{
    int size;
    void *p;

    if (!ldt_table)
        return 0;
    size = TARGET_LDT_ENTRIES * TARGET_LDT_ENTRY_SIZE;
    if (size > bytecount)
        size = bytecount;
    p = lock_user(VERIFY_WRITE, ptr, size, 0);
    if (!p)
        return -TARGET_EFAULT;
    /* ??? Should this by byteswapped?  */
    memcpy(p, ldt_table, size);
    unlock_user(p, ptr, size);
    return size;
}

/* XXX: add locking support */
static abi_long write_ldt(CPUX86State *env,
                          abi_ulong ptr, unsigned long bytecount, int oldmode)
{
    struct target_modify_ldt_ldt_s ldt_info;
    struct target_modify_ldt_ldt_s *target_ldt_info;
    int seg_32bit, contents, read_exec_only, limit_in_pages;
    int seg_not_present, useable, lm;
    uint32_t *lp, entry_1, entry_2;

    if (bytecount != sizeof(ldt_info))
        return -TARGET_EINVAL;
    if (!lock_user_struct(VERIFY_READ, target_ldt_info, ptr, 1))
        return -TARGET_EFAULT;
    ldt_info.entry_number = tswap32(target_ldt_info->entry_number);
    ldt_info.base_addr = tswapl(target_ldt_info->base_addr);
    ldt_info.limit = tswap32(target_ldt_info->limit);
    ldt_info.flags = tswap32(target_ldt_info->flags);
    unlock_user_struct(target_ldt_info, ptr, 0);

    if (ldt_info.entry_number >= TARGET_LDT_ENTRIES)
        return -TARGET_EINVAL;
    seg_32bit = ldt_info.flags & 1;
    contents = (ldt_info.flags >> 1) & 3;
    read_exec_only = (ldt_info.flags >> 3) & 1;
    limit_in_pages = (ldt_info.flags >> 4) & 1;
    seg_not_present = (ldt_info.flags >> 5) & 1;
    useable = (ldt_info.flags >> 6) & 1;
#ifdef TARGET_ABI32
    lm = 0;
#else
    lm = (ldt_info.flags >> 7) & 1;
#endif
    if (contents == 3) {
        if (oldmode)
            return -TARGET_EINVAL;
        if (seg_not_present == 0)
            return -TARGET_EINVAL;
    }
    /* allocate the LDT */
    if (!ldt_table) {
        env->ldt.base = target_mmap(0,
                                    TARGET_LDT_ENTRIES * TARGET_LDT_ENTRY_SIZE,
                                    PROT_READ|PROT_WRITE,
                                    MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
        if (env->ldt.base == -1)
            return -TARGET_ENOMEM;
        memset(g2h(env->ldt.base), 0,
               TARGET_LDT_ENTRIES * TARGET_LDT_ENTRY_SIZE);
        env->ldt.limit = 0xffff;
        ldt_table = g2h(env->ldt.base);
    }

    /* NOTE: same code as Linux kernel */
    /* Allow LDTs to be cleared by the user. */
    if (ldt_info.base_addr == 0 && ldt_info.limit == 0) {
        if (oldmode ||
            (contents == 0		&&
             read_exec_only == 1	&&
             seg_32bit == 0		&&
             limit_in_pages == 0	&&
             seg_not_present == 1	&&
             useable == 0 )) {
            entry_1 = 0;
            entry_2 = 0;
            goto install;
        }
    }

    entry_1 = ((ldt_info.base_addr & 0x0000ffff) << 16) |
        (ldt_info.limit & 0x0ffff);
    entry_2 = (ldt_info.base_addr & 0xff000000) |
        ((ldt_info.base_addr & 0x00ff0000) >> 16) |
        (ldt_info.limit & 0xf0000) |
        ((read_exec_only ^ 1) << 9) |
        (contents << 10) |
        ((seg_not_present ^ 1) << 15) |
        (seg_32bit << 22) |
        (limit_in_pages << 23) |
        (lm << 21) |
        0x7000;
    if (!oldmode)
        entry_2 |= (useable << 20);

    /* Install the new entry ...  */
install:
    lp = (uint32_t *)(ldt_table + (ldt_info.entry_number << 3));
    lp[0] = tswap32(entry_1);
    lp[1] = tswap32(entry_2);
    return 0;
}

/* specific and weird i386 syscalls */
static abi_long do_modify_ldt(CPUX86State *env, int func, abi_ulong ptr,
                              unsigned long bytecount)
{
    abi_long ret;

    switch (func) {
    case 0:
        ret = read_ldt(ptr, bytecount);
        break;
    case 1:
        ret = write_ldt(env, ptr, bytecount, 1);
        break;
    case 0x11:
        ret = write_ldt(env, ptr, bytecount, 0);
        break;
    default:
        ret = -TARGET_ENOSYS;
        break;
    }
    return ret;
}

#if defined(TARGET_I386) && defined(TARGET_ABI32)
static abi_long do_set_thread_area(CPUX86State *env, abi_ulong ptr)
{
    uint64_t *gdt_table = g2h(env->gdt.base);
    struct target_modify_ldt_ldt_s ldt_info;
    struct target_modify_ldt_ldt_s *target_ldt_info;
    int seg_32bit, contents, read_exec_only, limit_in_pages;
    int seg_not_present, useable, lm;
    uint32_t *lp, entry_1, entry_2;
    int i;

    lock_user_struct(VERIFY_WRITE, target_ldt_info, ptr, 1);
    if (!target_ldt_info)
        return -TARGET_EFAULT;
    ldt_info.entry_number = tswap32(target_ldt_info->entry_number);
    ldt_info.base_addr = tswapl(target_ldt_info->base_addr);
    ldt_info.limit = tswap32(target_ldt_info->limit);
    ldt_info.flags = tswap32(target_ldt_info->flags);
    if (ldt_info.entry_number == -1) {
        for (i=TARGET_GDT_ENTRY_TLS_MIN; i<=TARGET_GDT_ENTRY_TLS_MAX; i++) {
            if (gdt_table[i] == 0) {
                ldt_info.entry_number = i;
                target_ldt_info->entry_number = tswap32(i);
                break;
            }
        }
    }
    unlock_user_struct(target_ldt_info, ptr, 1);

    if (ldt_info.entry_number < TARGET_GDT_ENTRY_TLS_MIN || 
        ldt_info.entry_number > TARGET_GDT_ENTRY_TLS_MAX)
           return -TARGET_EINVAL;
    seg_32bit = ldt_info.flags & 1;
    contents = (ldt_info.flags >> 1) & 3;
    read_exec_only = (ldt_info.flags >> 3) & 1;
    limit_in_pages = (ldt_info.flags >> 4) & 1;
    seg_not_present = (ldt_info.flags >> 5) & 1;
    useable = (ldt_info.flags >> 6) & 1;
#ifdef TARGET_ABI32
    lm = 0;
#else
    lm = (ldt_info.flags >> 7) & 1;
#endif

    if (contents == 3) {
        if (seg_not_present == 0)
            return -TARGET_EINVAL;
    }

    /* NOTE: same code as Linux kernel */
    /* Allow LDTs to be cleared by the user. */
    if (ldt_info.base_addr == 0 && ldt_info.limit == 0) {
        if ((contents == 0             &&
             read_exec_only == 1       &&
             seg_32bit == 0            &&
             limit_in_pages == 0       &&
             seg_not_present == 1      &&
             useable == 0 )) {
            entry_1 = 0;
            entry_2 = 0;
            goto install;
        }
    }

    entry_1 = ((ldt_info.base_addr & 0x0000ffff) << 16) |
        (ldt_info.limit & 0x0ffff);
    entry_2 = (ldt_info.base_addr & 0xff000000) |
        ((ldt_info.base_addr & 0x00ff0000) >> 16) |
        (ldt_info.limit & 0xf0000) |
        ((read_exec_only ^ 1) << 9) |
        (contents << 10) |
        ((seg_not_present ^ 1) << 15) |
        (seg_32bit << 22) |
        (limit_in_pages << 23) |
        (useable << 20) |
        (lm << 21) |
        0x7000;

    /* Install the new entry ...  */
install:
    lp = (uint32_t *)(gdt_table + ldt_info.entry_number);
    lp[0] = tswap32(entry_1);
    lp[1] = tswap32(entry_2);
    return 0;
}

static abi_long do_get_thread_area(CPUX86State *env, abi_ulong ptr)
{
    struct target_modify_ldt_ldt_s *target_ldt_info;
    uint64_t *gdt_table = g2h(env->gdt.base);
    uint32_t base_addr, limit, flags;
    int seg_32bit, contents, read_exec_only, limit_in_pages, idx;
    int seg_not_present, useable, lm;
    uint32_t *lp, entry_1, entry_2;

    lock_user_struct(VERIFY_WRITE, target_ldt_info, ptr, 1);
    if (!target_ldt_info)
        return -TARGET_EFAULT;
    idx = tswap32(target_ldt_info->entry_number);
    if (idx < TARGET_GDT_ENTRY_TLS_MIN ||
        idx > TARGET_GDT_ENTRY_TLS_MAX) {
        unlock_user_struct(target_ldt_info, ptr, 1);
        return -TARGET_EINVAL;
    }
    lp = (uint32_t *)(gdt_table + idx);
    entry_1 = tswap32(lp[0]);
    entry_2 = tswap32(lp[1]);
    
    read_exec_only = ((entry_2 >> 9) & 1) ^ 1;
    contents = (entry_2 >> 10) & 3;
    seg_not_present = ((entry_2 >> 15) & 1) ^ 1;
    seg_32bit = (entry_2 >> 22) & 1;
    limit_in_pages = (entry_2 >> 23) & 1;
    useable = (entry_2 >> 20) & 1;
#ifdef TARGET_ABI32
    lm = 0;
#else
    lm = (entry_2 >> 21) & 1;
#endif
    flags = (seg_32bit << 0) | (contents << 1) |
        (read_exec_only << 3) | (limit_in_pages << 4) |
        (seg_not_present << 5) | (useable << 6) | (lm << 7);
    limit = (entry_1 & 0xffff) | (entry_2  & 0xf0000);
    base_addr = (entry_1 >> 16) | 
        (entry_2 & 0xff000000) | 
        ((entry_2 & 0xff) << 16);
    target_ldt_info->base_addr = tswapl(base_addr);
    target_ldt_info->limit = tswap32(limit);
    target_ldt_info->flags = tswap32(flags);
    unlock_user_struct(target_ldt_info, ptr, 1);
    return 0;
}
#endif /* TARGET_I386 && TARGET_ABI32 */

#ifndef TARGET_ABI32
static abi_long do_arch_prctl(CPUX86State *env, int code, abi_ulong addr)
{
    abi_long ret;
    abi_ulong val;
    int idx;
    
    switch(code) {
    case TARGET_ARCH_SET_GS:
    case TARGET_ARCH_SET_FS:
        if (code == TARGET_ARCH_SET_GS)
            idx = R_GS;
        else
            idx = R_FS;
        cpu_x86_load_seg(env, idx, 0);
        env->segs[idx].base = addr;
        break;
    case TARGET_ARCH_GET_GS:
    case TARGET_ARCH_GET_FS:
        if (code == TARGET_ARCH_GET_GS)
            idx = R_GS;
        else
            idx = R_FS;
        val = env->segs[idx].base;
        if (put_user(val, addr, abi_ulong))
            return -TARGET_EFAULT;
        break;
    default:
        ret = -TARGET_EINVAL;
        break;
    }
    return 0;
}
#endif

#endif /* defined(TARGET_I386) */

#if defined(CONFIG_USE_NPTL)

#define NEW_STACK_SIZE PTHREAD_STACK_MIN

static pthread_mutex_t clone_lock = PTHREAD_MUTEX_INITIALIZER;
typedef struct {
    CPUState *env;
    pthread_mutex_t mutex;
    pthread_cond_t cond;
    pthread_t thread;
    uint32_t tid;
    abi_ulong child_tidptr;
    abi_ulong parent_tidptr;
    sigset_t sigmask;
} new_thread_info;

static void *clone_func(void *arg)
{
    new_thread_info *info = arg;
    CPUState *env;
    TaskState *ts;

    env = info->env;
    thread_env = env;
    ts = (TaskState *)thread_env->opaque;
    info->tid = gettid();
    env->host_tid = info->tid;
    task_settid(ts);
    if (info->child_tidptr)
        put_user_u32(info->tid, info->child_tidptr);
    if (info->parent_tidptr)
        put_user_u32(info->tid, info->parent_tidptr);
    /* Enable signals.  */
    sigprocmask(SIG_SETMASK, &info->sigmask, NULL);
    /* Signal to the parent that we're ready.  */
    pthread_mutex_lock(&info->mutex);
    pthread_cond_broadcast(&info->cond);
    pthread_mutex_unlock(&info->mutex);
    /* Wait until the parent has finshed initializing the tls state.  */
    pthread_mutex_lock(&clone_lock);
    pthread_mutex_unlock(&clone_lock);
    cpu_loop(env);
    /* never exits */
    return NULL;
}
#else
/* this stack is the equivalent of the kernel stack associated with a
   thread/process */
#define NEW_STACK_SIZE 8192

static int clone_func(void *arg)
{
    CPUState *env = arg;
    cpu_loop(env);
    /* never exits */
    return 0;
}
#endif

/* do_fork() Must return host values and target errnos (unlike most
   do_*() functions). */
static int do_fork(CPUState *env, unsigned int flags, abi_ulong newsp,
                   abi_ulong parent_tidptr, target_ulong newtls,
                   abi_ulong child_tidptr)
{
    int ret;
    TaskState *ts;
    uint8_t *new_stack;
    CPUState *new_env;
#if defined(CONFIG_USE_NPTL)
    unsigned int nptl_flags;
    sigset_t sigmask;
#endif

    /* Emulate vfork() with fork() */
    if (flags & CLONE_VFORK)
        flags &= ~(CLONE_VFORK | CLONE_VM);

    if (flags & CLONE_VM) {
        TaskState *parent_ts = (TaskState *)env->opaque;
#if defined(CONFIG_USE_NPTL)
        new_thread_info info;
        pthread_attr_t attr;
#endif
        ts = qemu_mallocz(sizeof(TaskState) + NEW_STACK_SIZE);
        init_task_state(ts);
        new_stack = ts->stack;
        /* we create a new CPU instance. */
        new_env = cpu_copy(env);
        /* Init regs that differ from the parent.  */
        cpu_clone_regs(new_env, newsp);
        new_env->opaque = ts;
        ts->bprm = parent_ts->bprm;
        ts->info = parent_ts->info;
#if defined(CONFIG_USE_NPTL)
        nptl_flags = flags;
        flags &= ~CLONE_NPTL_FLAGS2;

        if (nptl_flags & CLONE_CHILD_CLEARTID) {
            ts->child_tidptr = child_tidptr;
        }

        if (nptl_flags & CLONE_SETTLS)
            cpu_set_tls (new_env, newtls);

        /* Grab a mutex so that thread setup appears atomic.  */
        pthread_mutex_lock(&clone_lock);

        memset(&info, 0, sizeof(info));
        pthread_mutex_init(&info.mutex, NULL);
        pthread_mutex_lock(&info.mutex);
        pthread_cond_init(&info.cond, NULL);
        info.env = new_env;
        if (nptl_flags & CLONE_CHILD_SETTID)
            info.child_tidptr = child_tidptr;
        if (nptl_flags & CLONE_PARENT_SETTID)
            info.parent_tidptr = parent_tidptr;

        ret = pthread_attr_init(&attr);
        ret = pthread_attr_setstack(&attr, new_stack, NEW_STACK_SIZE);
        /* It is not safe to deliver signals until the child has finished
           initializing, so temporarily block all signals.  */
        sigfillset(&sigmask);
        sigprocmask(SIG_BLOCK, &sigmask, &info.sigmask);

        ret = pthread_create(&info.thread, &attr, clone_func, &info);
        /* TODO: Free new CPU state if thread creation failed.  */

        sigprocmask(SIG_SETMASK, &info.sigmask, NULL);
        pthread_attr_destroy(&attr);
        if (ret == 0) {
            /* Wait for the child to initialize.  */
            pthread_cond_wait(&info.cond, &info.mutex);
            ret = info.tid;
            if (flags & CLONE_PARENT_SETTID)
                put_user_u32(ret, parent_tidptr);
        } else {
            ret = -1;
        }
        pthread_mutex_unlock(&info.mutex);
        pthread_cond_destroy(&info.cond);
        pthread_mutex_destroy(&info.mutex);
        pthread_mutex_unlock(&clone_lock);
#else
        if (flags & CLONE_NPTL_FLAGS2)
            return -EINVAL;
        /* This is probably going to die very quickly, but do it anyway.  */
#ifdef __ia64__
        ret = __clone2(clone_func, new_stack + NEW_STACK_SIZE, flags, new_env);
#else
	ret = clone(clone_func, new_stack + NEW_STACK_SIZE, flags, new_env);
#endif
#endif
    } else {
        /* if no CLONE_VM, we consider it is a fork */
        if ((flags & ~(CSIGNAL | CLONE_NPTL_FLAGS2)) != 0)
            return -EINVAL;
        fork_start();
        ret = fork();
        if (ret == 0) {
            /* Child Process.  */
            cpu_clone_regs(env, newsp);
            fork_end(1);
#if defined(CONFIG_USE_NPTL)
            /* There is a race condition here.  The parent process could
               theoretically read the TID in the child process before the child
               tid is set.  This would require using either ptrace
               (not implemented) or having *_tidptr to point at a shared memory
               mapping.  We can't repeat the spinlock hack used above because
               the child process gets its own copy of the lock.  */
            if (flags & CLONE_CHILD_SETTID)
                put_user_u32(gettid(), child_tidptr);
            if (flags & CLONE_PARENT_SETTID)
                put_user_u32(gettid(), parent_tidptr);
            ts = (TaskState *)env->opaque;
            if (flags & CLONE_SETTLS)
                cpu_set_tls (env, newtls);
            if (flags & CLONE_CHILD_CLEARTID)
                ts->child_tidptr = child_tidptr;
#endif
        } else {
            fork_end(0);
        }
    }
    return ret;
}

/* warning : doesn't handle linux specific flags... */
static int target_to_host_fcntl_cmd(int cmd)
{
    switch(cmd) {
	case TARGET_F_DUPFD:
	case TARGET_F_GETFD:
	case TARGET_F_SETFD:
	case TARGET_F_GETFL:
	case TARGET_F_SETFL:
            return cmd;
        case TARGET_F_GETLK:
	    return F_GETLK;
	case TARGET_F_SETLK:
	    return F_SETLK;
	case TARGET_F_SETLKW:
	    return F_SETLKW;
	case TARGET_F_GETOWN:
	    return F_GETOWN;
	case TARGET_F_SETOWN:
	    return F_SETOWN;
	case TARGET_F_GETSIG:
	    return F_GETSIG;
	case TARGET_F_SETSIG:
	    return F_SETSIG;
#if TARGET_ABI_BITS == 32
        case TARGET_F_GETLK64:
	    return F_GETLK64;
	case TARGET_F_SETLK64:
	    return F_SETLK64;
	case TARGET_F_SETLKW64:
	    return F_SETLKW64;
#endif
        case TARGET_F_SETLEASE:
            return F_SETLEASE;
        case TARGET_F_GETLEASE:
            return F_GETLEASE;
#ifdef F_DUPFD_CLOEXEC
        case TARGET_F_DUPFD_CLOEXEC:
            return F_DUPFD_CLOEXEC;
#endif
        case TARGET_F_NOTIFY:
            return F_NOTIFY;
	default:
            return -TARGET_EINVAL;
    }
    return -TARGET_EINVAL;
}

static abi_long do_fcntl(int fd, int cmd, abi_ulong arg)
{
    struct flock fl;
    struct target_flock *target_fl;
    struct flock64 fl64;
    struct target_flock64 *target_fl64;
    abi_long ret;
    int host_cmd = target_to_host_fcntl_cmd(cmd);

    if (host_cmd == -TARGET_EINVAL)
	    return host_cmd;

    switch(cmd) {
    case TARGET_F_GETLK:
        if (!lock_user_struct(VERIFY_READ, target_fl, arg, 1))
            return -TARGET_EFAULT;
        fl.l_type = tswap16(target_fl->l_type);
        fl.l_whence = tswap16(target_fl->l_whence);
        fl.l_start = tswapl(target_fl->l_start);
        fl.l_len = tswapl(target_fl->l_len);
        fl.l_pid = tswap32(target_fl->l_pid);
        unlock_user_struct(target_fl, arg, 0);
        ret = get_errno(fcntl(fd, host_cmd, &fl));
        if (ret == 0) {
            if (!lock_user_struct(VERIFY_WRITE, target_fl, arg, 0))
                return -TARGET_EFAULT;
            target_fl->l_type = tswap16(fl.l_type);
            target_fl->l_whence = tswap16(fl.l_whence);
            target_fl->l_start = tswapl(fl.l_start);
            target_fl->l_len = tswapl(fl.l_len);
            target_fl->l_pid = tswap32(fl.l_pid);
            unlock_user_struct(target_fl, arg, 1);
        }
        break;

    case TARGET_F_SETLK:
    case TARGET_F_SETLKW:
        if (!lock_user_struct(VERIFY_READ, target_fl, arg, 1))
            return -TARGET_EFAULT;
        fl.l_type = tswap16(target_fl->l_type);
        fl.l_whence = tswap16(target_fl->l_whence);
        fl.l_start = tswapl(target_fl->l_start);
        fl.l_len = tswapl(target_fl->l_len);
        fl.l_pid = tswap32(target_fl->l_pid);
        unlock_user_struct(target_fl, arg, 0);
        ret = get_errno(fcntl(fd, host_cmd, &fl));
        break;

    case TARGET_F_GETLK64:
        if (!lock_user_struct(VERIFY_READ, target_fl64, arg, 1))
            return -TARGET_EFAULT;
        fl64.l_type = tswap16(target_fl64->l_type) >> 1;
        fl64.l_whence = tswap16(target_fl64->l_whence);
        fl64.l_start = tswapl(target_fl64->l_start);
        fl64.l_len = tswapl(target_fl64->l_len);
        fl64.l_pid = tswap32(target_fl64->l_pid);
        unlock_user_struct(target_fl64, arg, 0);
        ret = get_errno(fcntl(fd, host_cmd, &fl64));
        if (ret == 0) {
            if (!lock_user_struct(VERIFY_WRITE, target_fl64, arg, 0))
                return -TARGET_EFAULT;
            target_fl64->l_type = tswap16(fl64.l_type) >> 1;
            target_fl64->l_whence = tswap16(fl64.l_whence);
            target_fl64->l_start = tswapl(fl64.l_start);
            target_fl64->l_len = tswapl(fl64.l_len);
            target_fl64->l_pid = tswap32(fl64.l_pid);
            unlock_user_struct(target_fl64, arg, 1);
        }
        break;
    case TARGET_F_SETLK64:
    case TARGET_F_SETLKW64:
        if (!lock_user_struct(VERIFY_READ, target_fl64, arg, 1))
            return -TARGET_EFAULT;
        fl64.l_type = tswap16(target_fl64->l_type) >> 1;
        fl64.l_whence = tswap16(target_fl64->l_whence);
        fl64.l_start = tswapl(target_fl64->l_start);
        fl64.l_len = tswapl(target_fl64->l_len);
        fl64.l_pid = tswap32(target_fl64->l_pid);
        unlock_user_struct(target_fl64, arg, 0);
        ret = get_errno(fcntl(fd, host_cmd, &fl64));
        break;

    case TARGET_F_GETFL:
        ret = get_errno(fcntl(fd, host_cmd, arg));
        if (ret >= 0) {
            ret = host_to_target_bitmask(ret, fcntl_flags_tbl);
        }
        break;

    case TARGET_F_SETFL:
        ret = get_errno(fcntl(fd, host_cmd, target_to_host_bitmask(arg, fcntl_flags_tbl)));
        break;

    case TARGET_F_SETOWN:
    case TARGET_F_GETOWN:
    case TARGET_F_SETSIG:
    case TARGET_F_GETSIG:
    case TARGET_F_SETLEASE:
    case TARGET_F_GETLEASE:
        ret = get_errno(fcntl(fd, host_cmd, arg));
        break;

    default:
        ret = get_errno(fcntl(fd, cmd, arg));
        break;
    }
    return ret;
}

#ifdef USE_UID16

static inline int high2lowuid(int uid)
{
    if (uid > 65535)
        return 65534;
    else
        return uid;
}

static inline int high2lowgid(int gid)
{
    if (gid > 65535)
        return 65534;
    else
        return gid;
}

static inline int low2highuid(int uid)
{
    if ((int16_t)uid == -1)
        return -1;
    else
        return uid;
}

static inline int low2highgid(int gid)
{
    if ((int16_t)gid == -1)
        return -1;
    else
        return gid;
}

#endif /* USE_UID16 */

void syscall_init(void)
{
    IOCTLEntry *ie;
    const argtype *arg_type;
    int size;
    int i;

#define STRUCT(name, ...) thunk_register_struct(STRUCT_ ## name, #name, struct_ ## name ## _def);
#define STRUCT_SPECIAL(name) thunk_register_struct_direct(STRUCT_ ## name, #name, &struct_ ## name ## _def);
#include "syscall_types.h"
#undef STRUCT
#undef STRUCT_SPECIAL

    /* we patch the ioctl size if necessary. We rely on the fact that
       no ioctl has all the bits at '1' in the size field */
    ie = ioctl_entries;
    while (ie->target_cmd != 0) {
        if (((ie->target_cmd >> TARGET_IOC_SIZESHIFT) & TARGET_IOC_SIZEMASK) ==
            TARGET_IOC_SIZEMASK) {
            arg_type = ie->arg_type;
            if (arg_type[0] != TYPE_PTR) {
                fprintf(stderr, "cannot patch size for ioctl 0x%x\n",
                        ie->target_cmd);
                exit(1);
            }
            arg_type++;
            size = thunk_type_size(arg_type, 0);
            ie->target_cmd = (ie->target_cmd &
                              ~(TARGET_IOC_SIZEMASK << TARGET_IOC_SIZESHIFT)) |
                (size << TARGET_IOC_SIZESHIFT);
        }

        /* Build target_to_host_errno_table[] table from
         * host_to_target_errno_table[]. */
        for (i=0; i < ERRNO_TABLE_SIZE; i++)
                target_to_host_errno_table[host_to_target_errno_table[i]] = i;

        /* automatic consistency check if same arch */
#if (defined(__i386__) && defined(TARGET_I386) && defined(TARGET_ABI32)) || \
    (defined(__x86_64__) && defined(TARGET_X86_64))
        if (unlikely(ie->target_cmd != ie->host_cmd)) {
            fprintf(stderr, "ERROR: ioctl(%s): target=0x%x host=0x%x\n",
                    ie->name, ie->target_cmd, ie->host_cmd);
        }
#endif
        ie++;
    }
}

#if TARGET_ABI_BITS == 32
static inline uint64_t target_offset64(uint32_t word0, uint32_t word1)
{
#ifdef TARGET_WORDS_BIGENDIAN
    return ((uint64_t)word0 << 32) | word1;
#else
    return ((uint64_t)word1 << 32) | word0;
#endif
}
#else /* TARGET_ABI_BITS == 32 */
static inline uint64_t target_offset64(uint64_t word0, uint64_t word1)
{
    return word0;
}
#endif /* TARGET_ABI_BITS != 32 */

#ifdef TARGET_NR_truncate64
static inline abi_long target_truncate64(void *cpu_env, const char *arg1,
                                         abi_long arg2,
                                         abi_long arg3,
                                         abi_long arg4)
{
#ifdef TARGET_ARM
    if (((CPUARMState *)cpu_env)->eabi)
      {
        arg2 = arg3;
        arg3 = arg4;
      }
#endif
    return get_errno(truncate64(arg1, target_offset64(arg2, arg3)));
}
#endif

#ifdef TARGET_NR_ftruncate64
static inline abi_long target_ftruncate64(void *cpu_env, abi_long arg1,
                                          abi_long arg2,
                                          abi_long arg3,
                                          abi_long arg4)
{
#ifdef TARGET_ARM
    if (((CPUARMState *)cpu_env)->eabi)
      {
        arg2 = arg3;
        arg3 = arg4;
      }
#endif
    return get_errno(ftruncate64(arg1, target_offset64(arg2, arg3)));
}
#endif

static inline abi_long target_to_host_timespec(struct timespec *host_ts,
                                               abi_ulong target_addr)
{
    struct target_timespec *target_ts;

    if (!lock_user_struct(VERIFY_READ, target_ts, target_addr, 1))
        return -TARGET_EFAULT;
    host_ts->tv_sec = tswapl(target_ts->tv_sec);
    host_ts->tv_nsec = tswapl(target_ts->tv_nsec);
    unlock_user_struct(target_ts, target_addr, 0);
    return 0;
}

static inline abi_long host_to_target_timespec(abi_ulong target_addr,
                                               struct timespec *host_ts)
{
    struct target_timespec *target_ts;

    if (!lock_user_struct(VERIFY_WRITE, target_ts, target_addr, 0))
        return -TARGET_EFAULT;
    target_ts->tv_sec = tswapl(host_ts->tv_sec);
    target_ts->tv_nsec = tswapl(host_ts->tv_nsec);
    unlock_user_struct(target_ts, target_addr, 1);
    return 0;
}

#if defined(TARGET_NR_stat64) || defined(TARGET_NR_newfstatat)
static inline abi_long host_to_target_stat64(void *cpu_env,
                                             abi_ulong target_addr,
                                             struct stat *host_st)
{
#ifdef TARGET_ARM
    if (((CPUARMState *)cpu_env)->eabi) {
        struct target_eabi_stat64 *target_st;

        if (!lock_user_struct(VERIFY_WRITE, target_st, target_addr, 0))
            return -TARGET_EFAULT;
        memset(target_st, 0, sizeof(struct target_eabi_stat64));
        __put_user(host_st->st_dev, &target_st->st_dev);
        __put_user(host_st->st_ino, &target_st->st_ino);
#ifdef TARGET_STAT64_HAS_BROKEN_ST_INO
        __put_user(host_st->st_ino, &target_st->__st_ino);
#endif
        __put_user(host_st->st_mode, &target_st->st_mode);
        __put_user(host_st->st_nlink, &target_st->st_nlink);
        __put_user(host_st->st_uid, &target_st->st_uid);
        __put_user(host_st->st_gid, &target_st->st_gid);
        __put_user(host_st->st_rdev, &target_st->st_rdev);
        __put_user(host_st->st_size, &target_st->st_size);
        __put_user(host_st->st_blksize, &target_st->st_blksize);
        __put_user(host_st->st_blocks, &target_st->st_blocks);
        __put_user(host_st->st_atime, &target_st->target_st_atime);
        __put_user(host_st->st_mtime, &target_st->target_st_mtime);
        __put_user(host_st->st_ctime, &target_st->target_st_ctime);
        unlock_user_struct(target_st, target_addr, 1);
    } else
#endif
    {
#if TARGET_LONG_BITS == 64
        struct target_stat *target_st;
#else
        struct target_stat64 *target_st;
#endif

        if (!lock_user_struct(VERIFY_WRITE, target_st, target_addr, 0))
            return -TARGET_EFAULT;
        memset(target_st, 0, sizeof(*target_st));
        __put_user(host_st->st_dev, &target_st->st_dev);
        __put_user(host_st->st_ino, &target_st->st_ino);
#ifdef TARGET_STAT64_HAS_BROKEN_ST_INO
        __put_user(host_st->st_ino, &target_st->__st_ino);
#endif
        __put_user(host_st->st_mode, &target_st->st_mode);
        __put_user(host_st->st_nlink, &target_st->st_nlink);
        __put_user(host_st->st_uid, &target_st->st_uid);
        __put_user(host_st->st_gid, &target_st->st_gid);
        __put_user(host_st->st_rdev, &target_st->st_rdev);
        /* XXX: better use of kernel struct */
        __put_user(host_st->st_size, &target_st->st_size);
        __put_user(host_st->st_blksize, &target_st->st_blksize);
        __put_user(host_st->st_blocks, &target_st->st_blocks);
        __put_user(host_st->st_atime, &target_st->target_st_atime);
        __put_user(host_st->st_mtime, &target_st->target_st_mtime);
        __put_user(host_st->st_ctime, &target_st->target_st_ctime);
        unlock_user_struct(target_st, target_addr, 1);
    }

    return 0;
}
#endif

#if defined(CONFIG_USE_NPTL)
/* ??? Using host futex calls even when target atomic operations
   are not really atomic probably breaks things.  However implementing
   futexes locally would make futexes shared between multiple processes
   tricky.  However they're probably useless because guest atomic
   operations won't work either.  */
static int do_futex(target_ulong uaddr, int op, int val, target_ulong timeout,
                    target_ulong uaddr2, int val3)
{
    struct timespec ts, *pts;
    int base_op;

    /* ??? We assume FUTEX_* constants are the same on both host
       and target.  */
#ifdef FUTEX_CMD_MASK
    base_op = op & FUTEX_CMD_MASK;
#else
    base_op = op;
#endif
    switch (base_op) {
    case FUTEX_WAIT:
        if (timeout) {
            pts = &ts;
            target_to_host_timespec(pts, timeout);
        } else {
            pts = NULL;
        }
        return get_errno(sys_futex(g2h(uaddr), op, tswap32(val),
                         pts, NULL, 0));
    case FUTEX_WAKE:
        return get_errno(sys_futex(g2h(uaddr), op, val, NULL, NULL, 0));
    case FUTEX_FD:
        return get_errno(sys_futex(g2h(uaddr), op, val, NULL, NULL, 0));
    case FUTEX_REQUEUE:
    case FUTEX_CMP_REQUEUE:
    case FUTEX_WAKE_OP:
        /* For FUTEX_REQUEUE, FUTEX_CMP_REQUEUE, and FUTEX_WAKE_OP, the
           TIMEOUT parameter is interpreted as a uint32_t by the kernel.
           But the prototype takes a `struct timespec *'; insert casts
           to satisfy the compiler.  We do not need to tswap TIMEOUT
           since it's not compared to guest memory.  */
        pts = (struct timespec *)(uintptr_t) timeout;
        return get_errno(sys_futex(g2h(uaddr), op, val, pts,
                                   g2h(uaddr2),
                                   (base_op == FUTEX_CMP_REQUEUE
                                    ? tswap32(val3)
                                    : val3)));
    default:
        return -TARGET_ENOSYS;
    }
}
#endif

/* Map host to target signal numbers for the wait family of syscalls.
   Assume all other status bits are the same.  */
static int host_to_target_waitstatus(int status)
{
    if (WIFSIGNALED(status)) {
        return host_to_target_signal(WTERMSIG(status)) | (status & ~0x7f);
    }
    if (WIFSTOPPED(status)) {
        return (host_to_target_signal(WSTOPSIG(status)) << 8)
               | (status & 0xff);
    }
    return status;
}

int get_osversion(void)
{
    static int osversion;
    struct new_utsname buf;
    const char *s;
    int i, n, tmp;
    if (osversion)
        return osversion;
    if (qemu_uname_release && *qemu_uname_release) {
        s = qemu_uname_release;
    } else {
        if (sys_uname(&buf))
            return 0;
        s = buf.release;
    }
    tmp = 0;
    for (i = 0; i < 3; i++) {
        n = 0;
        while (*s >= '0' && *s <= '9') {
            n *= 10;
            n += *s - '0';
            s++;
        }
        tmp = (tmp << 8) + n;
        if (*s == '.')
            s++;
    }
    osversion = tmp;
    return osversion;
}

/* do_syscall() should always have a single exit point at the end so
   that actions, such as logging of syscall results, can be performed.
   All errnos that do_syscall() returns must be -TARGET_<errcode>. */
abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
                    abi_long arg2, abi_long arg3, abi_long arg4,
                    abi_long arg5, abi_long arg6)
{
    abi_long ret;
    struct stat st;
    struct statfs stfs;
    void *p;

#ifdef DEBUG
    gemu_log("syscall %d", num);
#endif
    if(do_strace)
        print_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);

    switch(num) {
    case TARGET_NR_exit:
#ifdef CONFIG_USE_NPTL
      /* In old applications this may be used to implement _exit(2).
         However in threaded applictions it is used for thread termination,
         and _exit_group is used for application termination.
         Do thread termination if we have more then one thread.  */
      /* FIXME: This probably breaks if a signal arrives.  We should probably
         be disabling signals.  */
      if (first_cpu->next_cpu) {
          TaskState *ts;
          CPUState **lastp;
          CPUState *p;

          cpu_list_lock();
          lastp = &first_cpu;
          p = first_cpu;
          while (p && p != (CPUState *)cpu_env) {
              lastp = &p->next_cpu;
              p = p->next_cpu;
          }
          /* If we didn't find the CPU for this thread then something is
             horribly wrong.  */
          if (!p)
              abort();
          /* Remove the CPU from the list.  */
          *lastp = p->next_cpu;
          cpu_list_unlock();
          ts = ((CPUState *)cpu_env)->opaque;
          if (ts->child_tidptr) {
              put_user_u32(0, ts->child_tidptr);
              sys_futex(g2h(ts->child_tidptr), FUTEX_WAKE, INT_MAX,
                        NULL, NULL, 0);
          }
          /* TODO: Free CPU state.  */
          pthread_exit(NULL);
      }
#endif
#ifdef TARGET_GPROF
        _mcleanup();
#endif
        gdb_exit(cpu_env, arg1);
        _exit(arg1);
        ret = 0; /* avoid warning */
        break;
    case TARGET_NR_read:
        if (arg3 == 0)
            ret = 0;
        else {
            if (!(p = lock_user(VERIFY_WRITE, arg2, arg3, 0)))
                goto efault;
            ret = get_errno(read(arg1, p, arg3));
            unlock_user(p, arg2, ret);
        }
        break;
    case TARGET_NR_write:
        if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
            goto efault;
        ret = get_errno(write(arg1, p, arg3));
        unlock_user(p, arg2, 0);
        break;
    case TARGET_NR_open:
        if (!(p = lock_user_string(arg1)))
            goto efault;
        ret = get_errno(open(path(p),
                             target_to_host_bitmask(arg2, fcntl_flags_tbl),
                             arg3));
        unlock_user(p, arg1, 0);
        break;
#if defined(TARGET_NR_openat) && defined(__NR_openat)
    case TARGET_NR_openat:
        if (!(p = lock_user_string(arg2)))
            goto efault;
        ret = get_errno(sys_openat(arg1,
                                   path(p),
                                   target_to_host_bitmask(arg3, fcntl_flags_tbl),
                                   arg4));
        unlock_user(p, arg2, 0);
        break;
#endif
    case TARGET_NR_close:
        ret = get_errno(close(arg1));
        break;
    case TARGET_NR_brk:
        ret = do_brk(arg1);
        break;
    case TARGET_NR_fork:
        ret = get_errno(do_fork(cpu_env, SIGCHLD, 0, 0, 0, 0));
        break;
#ifdef TARGET_NR_waitpid
    case TARGET_NR_waitpid:
        {
            int status;
            ret = get_errno(waitpid(arg1, &status, arg3));
            if (!is_error(ret) && arg2
                && put_user_s32(host_to_target_waitstatus(status), arg2))
                goto efault;
        }
        break;
#endif
#ifdef TARGET_NR_waitid
    case TARGET_NR_waitid:
        {
            siginfo_t info;
            info.si_pid = 0;
            ret = get_errno(waitid(arg1, arg2, &info, arg4));
            if (!is_error(ret) && arg3 && info.si_pid != 0) {
                if (!(p = lock_user(VERIFY_WRITE, arg3, sizeof(target_siginfo_t), 0)))
                    goto efault;
                host_to_target_siginfo(p, &info);
                unlock_user(p, arg3, sizeof(target_siginfo_t));
            }
        }
        break;
#endif
#ifdef TARGET_NR_creat /* not on alpha */
    case TARGET_NR_creat:
        if (!(p = lock_user_string(arg1)))
            goto efault;
        ret = get_errno(creat(p, arg2));
        unlock_user(p, arg1, 0);
        break;
#endif
    case TARGET_NR_link:
        {
            void * p2;
            p = lock_user_string(arg1);
            p2 = lock_user_string(arg2);
            if (!p || !p2)
                ret = -TARGET_EFAULT;
            else
                ret = get_errno(link(p, p2));
            unlock_user(p2, arg2, 0);
            unlock_user(p, arg1, 0);
        }
        break;
#if defined(TARGET_NR_linkat) && defined(__NR_linkat)
    case TARGET_NR_linkat:
        {
            void * p2 = NULL;
            if (!arg2 || !arg4)
                goto efault;
            p  = lock_user_string(arg2);
            p2 = lock_user_string(arg4);
            if (!p || !p2)
                ret = -TARGET_EFAULT;
            else
                ret = get_errno(sys_linkat(arg1, p, arg3, p2, arg5));
            unlock_user(p, arg2, 0);
            unlock_user(p2, arg4, 0);
        }
        break;
#endif
    case TARGET_NR_unlink:
        if (!(p = lock_user_string(arg1)))
            goto efault;
        ret = get_errno(unlink(p));
        unlock_user(p, arg1, 0);
        break;
#if defined(TARGET_NR_unlinkat) && defined(__NR_unlinkat)
    case TARGET_NR_unlinkat:
        if (!(p = lock_user_string(arg2)))
            goto efault;
        ret = get_errno(sys_unlinkat(arg1, p, arg3));
        unlock_user(p, arg2, 0);
        break;
#endif
    case TARGET_NR_execve:
        {
            char **argp, **envp;
            int argc, envc;
            abi_ulong gp;
            abi_ulong guest_argp;
            abi_ulong guest_envp;
            abi_ulong addr;
            char **q;

            argc = 0;
            guest_argp = arg2;
            for (gp = guest_argp; gp; gp += sizeof(abi_ulong)) {
                if (get_user_ual(addr, gp))
                    goto efault;
                if (!addr)
                    break;
                argc++;
            }
            envc = 0;
            guest_envp = arg3;
            for (gp = guest_envp; gp; gp += sizeof(abi_ulong)) {
                if (get_user_ual(addr, gp))
                    goto efault;
                if (!addr)
                    break;
                envc++;
            }

            argp = alloca((argc + 1) * sizeof(void *));
            envp = alloca((envc + 1) * sizeof(void *));

            for (gp = guest_argp, q = argp; gp;
                  gp += sizeof(abi_ulong), q++) {
                if (get_user_ual(addr, gp))
                    goto execve_efault;
                if (!addr)
                    break;
                if (!(*q = lock_user_string(addr)))
                    goto execve_efault;
            }
            *q = NULL;

            for (gp = guest_envp, q = envp; gp;
                  gp += sizeof(abi_ulong), q++) {
                if (get_user_ual(addr, gp))
                    goto execve_efault;
                if (!addr)
                    break;
                if (!(*q = lock_user_string(addr)))
                    goto execve_efault;
            }
            *q = NULL;

            if (!(p = lock_user_string(arg1)))
                goto execve_efault;
            ret = get_errno(execve(p, argp, envp));
            unlock_user(p, arg1, 0);

            goto execve_end;

        execve_efault:
            ret = -TARGET_EFAULT;

        execve_end:
            for (gp = guest_argp, q = argp; *q;
                  gp += sizeof(abi_ulong), q++) {
                if (get_user_ual(addr, gp)
                    || !addr)
                    break;
                unlock_user(*q, addr, 0);
            }
            for (gp = guest_envp, q = envp; *q;
                  gp += sizeof(abi_ulong), q++) {
                if (get_user_ual(addr, gp)
                    || !addr)
                    break;
                unlock_user(*q, addr, 0);
            }
        }
        break;
    case TARGET_NR_chdir:
        if (!(p = lock_user_string(arg1)))
            goto efault;
        ret = get_errno(chdir(p));
        unlock_user(p, arg1, 0);
        break;
#ifdef TARGET_NR_time
    case TARGET_NR_time:
        {
            time_t host_time;
            ret = get_errno(time(&host_time));
            if (!is_error(ret)
                && arg1
                && put_user_sal(host_time, arg1))
                goto efault;
        }
        break;
#endif
    case TARGET_NR_mknod:
        if (!(p = lock_user_string(arg1)))
            goto efault;
        ret = get_errno(mknod(p, arg2, arg3));
        unlock_user(p, arg1, 0);
        break;
#if defined(TARGET_NR_mknodat) && defined(__NR_mknodat)
    case TARGET_NR_mknodat:
        if (!(p = lock_user_string(arg2)))
            goto efault;
        ret = get_errno(sys_mknodat(arg1, p, arg3, arg4));
        unlock_user(p, arg2, 0);
        break;
#endif
    case TARGET_NR_chmod:
        if (!(p = lock_user_string(arg1)))
            goto efault;
        ret = get_errno(chmod(p, arg2));
        unlock_user(p, arg1, 0);
        break;
#ifdef TARGET_NR_break
    case TARGET_NR_break:
        goto unimplemented;
#endif
#ifdef TARGET_NR_oldstat
    case TARGET_NR_oldstat:
        goto unimplemented;
#endif
    case TARGET_NR_lseek:
        ret = get_errno(lseek(arg1, arg2, arg3));
        break;
#ifdef TARGET_NR_getxpid
    case TARGET_NR_getxpid:
#else
    case TARGET_NR_getpid:
#endif
        ret = get_errno(getpid());
        break;
    case TARGET_NR_mount:
		{
			/* need to look at the data field */
			void *p2, *p3;
			p = lock_user_string(arg1);
			p2 = lock_user_string(arg2);
			p3 = lock_user_string(arg3);
                        if (!p || !p2 || !p3)
                            ret = -TARGET_EFAULT;
                        else
                            /* FIXME - arg5 should be locked, but it isn't clear how to
                             * do that since it's not guaranteed to be a NULL-terminated
                             * string.
                             */
                            ret = get_errno(mount(p, p2, p3, (unsigned long)arg4, g2h(arg5)));
                        unlock_user(p, arg1, 0);
                        unlock_user(p2, arg2, 0);
                        unlock_user(p3, arg3, 0);
			break;
		}
#ifdef TARGET_NR_umount
    case TARGET_NR_umount:
        if (!(p = lock_user_string(arg1)))
            goto efault;
        ret = get_errno(umount(p));
        unlock_user(p, arg1, 0);
        break;
#endif
#ifdef TARGET_NR_stime /* not on alpha */
    case TARGET_NR_stime:
        {
            time_t host_time;
            if (get_user_sal(host_time, arg1))
                goto efault;
            ret = get_errno(stime(&host_time));
        }
        break;
#endif
    case TARGET_NR_ptrace:
        goto unimplemented;
#ifdef TARGET_NR_alarm /* not on alpha */
    case TARGET_NR_alarm:
        ret = alarm(arg1);
        break;
#endif
#ifdef TARGET_NR_oldfstat
    case TARGET_NR_oldfstat:
        goto unimplemented;
#endif
#ifdef TARGET_NR_pause /* not on alpha */
    case TARGET_NR_pause:
        ret = get_errno(pause());
        break;
#endif
#ifdef TARGET_NR_utime
    case TARGET_NR_utime:
        {
            struct utimbuf tbuf, *host_tbuf;
            struct target_utimbuf *target_tbuf;
            if (arg2) {
                if (!lock_user_struct(VERIFY_READ, target_tbuf, arg2, 1))
                    goto efault;
                tbuf.actime = tswapl(target_tbuf->actime);
                tbuf.modtime = tswapl(target_tbuf->modtime);
                unlock_user_struct(target_tbuf, arg2, 0);
                host_tbuf = &tbuf;
            } else {
                host_tbuf = NULL;
            }
            if (!(p = lock_user_string(arg1)))
                goto efault;
            ret = get_errno(utime(p, host_tbuf));
            unlock_user(p, arg1, 0);
        }
        break;
#endif
    case TARGET_NR_utimes:
        {
            struct timeval *tvp, tv[2];
            if (arg2) {
                if (copy_from_user_timeval(&tv[0], arg2)
                    || copy_from_user_timeval(&tv[1],
                                              arg2 + sizeof(struct target_timeval)))
                    goto efault;
                tvp = tv;
            } else {
                tvp = NULL;
            }
            if (!(p = lock_user_string(arg1)))
                goto efault;
            ret = get_errno(utimes(p, tvp));
            unlock_user(p, arg1, 0);
        }
        break;
#if defined(TARGET_NR_futimesat) && defined(__NR_futimesat)
    case TARGET_NR_futimesat:
        {
            struct timeval *tvp, tv[2];
            if (arg3) {
                if (copy_from_user_timeval(&tv[0], arg3)
                    || copy_from_user_timeval(&tv[1],
                                              arg3 + sizeof(struct target_timeval)))
                    goto efault;
                tvp = tv;
            } else {
                tvp = NULL;
            }
            if (!(p = lock_user_string(arg2)))
                goto efault;
            ret = get_errno(sys_futimesat(arg1, path(p), tvp));
            unlock_user(p, arg2, 0);
        }
        break;
#endif
#ifdef TARGET_NR_stty
    case TARGET_NR_stty:
        goto unimplemented;
#endif
#ifdef TARGET_NR_gtty
    case TARGET_NR_gtty:
        goto unimplemented;
#endif
    case TARGET_NR_access:
        if (!(p = lock_user_string(arg1)))
            goto efault;
        ret = get_errno(access(path(p), arg2));
        unlock_user(p, arg1, 0);
        break;
#if defined(TARGET_NR_faccessat) && defined(__NR_faccessat)
    case TARGET_NR_faccessat:
        if (!(p = lock_user_string(arg2)))
            goto efault;
        ret = get_errno(sys_faccessat(arg1, p, arg3));
        unlock_user(p, arg2, 0);
        break;
#endif
#ifdef TARGET_NR_nice /* not on alpha */
    case TARGET_NR_nice:
        ret = get_errno(nice(arg1));
        break;
#endif
#ifdef TARGET_NR_ftime
    case TARGET_NR_ftime:
        goto unimplemented;
#endif
    case TARGET_NR_sync:
        sync();
        ret = 0;
        break;
    case TARGET_NR_kill:
        ret = get_errno(kill(arg1, target_to_host_signal(arg2)));
        break;
    case TARGET_NR_rename:
        {
            void *p2;
            p = lock_user_string(arg1);
            p2 = lock_user_string(arg2);
            if (!p || !p2)
                ret = -TARGET_EFAULT;
            else
                ret = get_errno(rename(p, p2));
            unlock_user(p2, arg2, 0);
            unlock_user(p, arg1, 0);
        }
        break;
#if defined(TARGET_NR_renameat) && defined(__NR_renameat)
    case TARGET_NR_renameat:
        {
            void *p2;
            p  = lock_user_string(arg2);
            p2 = lock_user_string(arg4);
            if (!p || !p2)
                ret = -TARGET_EFAULT;
            else
                ret = get_errno(sys_renameat(arg1, p, arg3, p2));
            unlock_user(p2, arg4, 0);
            unlock_user(p, arg2, 0);
        }
        break;
#endif
    case TARGET_NR_mkdir:
        if (!(p = lock_user_string(arg1)))
            goto efault;
        ret = get_errno(mkdir(p, arg2));
        unlock_user(p, arg1, 0);
        break;
#if defined(TARGET_NR_mkdirat) && defined(__NR_mkdirat)
    case TARGET_NR_mkdirat:
        if (!(p = lock_user_string(arg2)))
            goto efault;
        ret = get_errno(sys_mkdirat(arg1, p, arg3));
        unlock_user(p, arg2, 0);
        break;
#endif
    case TARGET_NR_rmdir:
        if (!(p = lock_user_string(arg1)))
            goto efault;
        ret = get_errno(rmdir(p));
        unlock_user(p, arg1, 0);
        break;
    case TARGET_NR_dup:
        ret = get_errno(dup(arg1));
        break;
    case TARGET_NR_pipe:
        ret = do_pipe(cpu_env, arg1, 0);
        break;
#ifdef TARGET_NR_pipe2
    case TARGET_NR_pipe2:
        ret = do_pipe(cpu_env, arg1, arg2);
        break;
#endif
    case TARGET_NR_times:
        {
            struct target_tms *tmsp;
            struct tms tms;
            ret = get_errno(times(&tms));
            if (arg1) {
                tmsp = lock_user(VERIFY_WRITE, arg1, sizeof(struct target_tms), 0);
                if (!tmsp)
                    goto efault;
                tmsp->tms_utime = tswapl(host_to_target_clock_t(tms.tms_utime));
                tmsp->tms_stime = tswapl(host_to_target_clock_t(tms.tms_stime));
                tmsp->tms_cutime = tswapl(host_to_target_clock_t(tms.tms_cutime));
                tmsp->tms_cstime = tswapl(host_to_target_clock_t(tms.tms_cstime));
            }
            if (!is_error(ret))
                ret = host_to_target_clock_t(ret);
        }
        break;
#ifdef TARGET_NR_prof
    case TARGET_NR_prof:
        goto unimplemented;
#endif
#ifdef TARGET_NR_signal
    case TARGET_NR_signal:
        goto unimplemented;
#endif
    case TARGET_NR_acct:
        if (arg1 == 0) {
            ret = get_errno(acct(NULL));
        } else {
            if (!(p = lock_user_string(arg1)))
                goto efault;
            ret = get_errno(acct(path(p)));
            unlock_user(p, arg1, 0);
        }
        break;
#ifdef TARGET_NR_umount2 /* not on alpha */
    case TARGET_NR_umount2:
        if (!(p = lock_user_string(arg1)))
            goto efault;
        ret = get_errno(umount2(p, arg2));
        unlock_user(p, arg1, 0);
        break;
#endif
#ifdef TARGET_NR_lock
    case TARGET_NR_lock:
        goto unimplemented;
#endif
    case TARGET_NR_ioctl:
        ret = do_ioctl(arg1, arg2, arg3);
        break;
    case TARGET_NR_fcntl:
        ret = do_fcntl(arg1, arg2, arg3);
        break;
#ifdef TARGET_NR_mpx
    case TARGET_NR_mpx:
        goto unimplemented;
#endif
    case TARGET_NR_setpgid:
        ret = get_errno(setpgid(arg1, arg2));
        break;
#ifdef TARGET_NR_ulimit
    case TARGET_NR_ulimit:
        goto unimplemented;
#endif
#ifdef TARGET_NR_oldolduname
    case TARGET_NR_oldolduname:
        goto unimplemented;
#endif
    case TARGET_NR_umask:
        ret = get_errno(umask(arg1));
        break;
    case TARGET_NR_chroot:
        if (!(p = lock_user_string(arg1)))
            goto efault;
        ret = get_errno(chroot(p));
        unlock_user(p, arg1, 0);
        break;
    case TARGET_NR_ustat:
        goto unimplemented;
    case TARGET_NR_dup2:
        ret = get_errno(dup2(arg1, arg2));
        break;
#if defined(CONFIG_DUP3) && defined(TARGET_NR_dup3)
    case TARGET_NR_dup3:
        ret = get_errno(dup3(arg1, arg2, arg3));
        break;
#endif
#ifdef TARGET_NR_getppid /* not on alpha */
    case TARGET_NR_getppid:
        ret = get_errno(getppid());
        break;
#endif
    case TARGET_NR_getpgrp:
        ret = get_errno(getpgrp());
        break;
    case TARGET_NR_setsid:
        ret = get_errno(setsid());
        break;
#ifdef TARGET_NR_sigaction
    case TARGET_NR_sigaction:
        {
#if !defined(TARGET_MIPS)
            struct target_old_sigaction *old_act;
            struct target_sigaction act, oact, *pact;
            if (arg2) {
                if (!lock_user_struct(VERIFY_READ, old_act, arg2, 1))
                    goto efault;
                act._sa_handler = old_act->_sa_handler;
                target_siginitset(&act.sa_mask, old_act->sa_mask);
                act.sa_flags = old_act->sa_flags;
                act.sa_restorer = old_act->sa_restorer;
                unlock_user_struct(old_act, arg2, 0);
                pact = &act;
            } else {
                pact = NULL;
            }
            ret = get_errno(do_sigaction(arg1, pact, &oact));
            if (!is_error(ret) && arg3) {
                if (!lock_user_struct(VERIFY_WRITE, old_act, arg3, 0))
                    goto efault;
                old_act->_sa_handler = oact._sa_handler;
                old_act->sa_mask = oact.sa_mask.sig[0];
                old_act->sa_flags = oact.sa_flags;
                old_act->sa_restorer = oact.sa_restorer;
                unlock_user_struct(old_act, arg3, 1);
            }
#else
	    struct target_sigaction act, oact, *pact, *old_act;

	    if (arg2) {
                if (!lock_user_struct(VERIFY_READ, old_act, arg2, 1))
                    goto efault;
		act._sa_handler = old_act->_sa_handler;
		target_siginitset(&act.sa_mask, old_act->sa_mask.sig[0]);
		act.sa_flags = old_act->sa_flags;
		unlock_user_struct(old_act, arg2, 0);
		pact = &act;
	    } else {
		pact = NULL;
	    }

	    ret = get_errno(do_sigaction(arg1, pact, &oact));

	    if (!is_error(ret) && arg3) {
                if (!lock_user_struct(VERIFY_WRITE, old_act, arg3, 0))
                    goto efault;
		old_act->_sa_handler = oact._sa_handler;
		old_act->sa_flags = oact.sa_flags;
		old_act->sa_mask.sig[0] = oact.sa_mask.sig[0];
		old_act->sa_mask.sig[1] = 0;
		old_act->sa_mask.sig[2] = 0;
		old_act->sa_mask.sig[3] = 0;
		unlock_user_struct(old_act, arg3, 1);
	    }
#endif
        }
        break;
#endif
    case TARGET_NR_rt_sigaction:
        {
            struct target_sigaction *act;
            struct target_sigaction *oact;

            if (arg2) {
                if (!lock_user_struct(VERIFY_READ, act, arg2, 1))
                    goto efault;
            } else
                act = NULL;
            if (arg3) {
                if (!lock_user_struct(VERIFY_WRITE, oact, arg3, 0)) {
                    ret = -TARGET_EFAULT;
                    goto rt_sigaction_fail;
                }
            } else
                oact = NULL;
            ret = get_errno(do_sigaction(arg1, act, oact));
	rt_sigaction_fail:
            if (act)
                unlock_user_struct(act, arg2, 0);
            if (oact)
                unlock_user_struct(oact, arg3, 1);
        }
        break;
#ifdef TARGET_NR_sgetmask /* not on alpha */
    case TARGET_NR_sgetmask:
        {
            sigset_t cur_set;
            abi_ulong target_set;
            sigprocmask(0, NULL, &cur_set);
            host_to_target_old_sigset(&target_set, &cur_set);
            ret = target_set;
        }
        break;
#endif
#ifdef TARGET_NR_ssetmask /* not on alpha */
    case TARGET_NR_ssetmask:
        {
            sigset_t set, oset, cur_set;
            abi_ulong target_set = arg1;
            sigprocmask(0, NULL, &cur_set);
            target_to_host_old_sigset(&set, &target_set);
            sigorset(&set, &set, &cur_set);
            sigprocmask(SIG_SETMASK, &set, &oset);
            host_to_target_old_sigset(&target_set, &oset);
            ret = target_set;
        }
        break;
#endif
#ifdef TARGET_NR_sigprocmask
    case TARGET_NR_sigprocmask:
        {
            int how = arg1;
            sigset_t set, oldset, *set_ptr;

            if (arg2) {
                switch(how) {
                case TARGET_SIG_BLOCK:
                    how = SIG_BLOCK;
                    break;
                case TARGET_SIG_UNBLOCK:
                    how = SIG_UNBLOCK;
                    break;
                case TARGET_SIG_SETMASK:
                    how = SIG_SETMASK;
                    break;
                default:
                    ret = -TARGET_EINVAL;
                    goto fail;
                }
                if (!(p = lock_user(VERIFY_READ, arg2, sizeof(target_sigset_t), 1)))
                    goto efault;
                target_to_host_old_sigset(&set, p);
                unlock_user(p, arg2, 0);
                set_ptr = &set;
            } else {
                how = 0;
                set_ptr = NULL;
            }
            ret = get_errno(sigprocmask(arg1, set_ptr, &oldset));
            if (!is_error(ret) && arg3) {
                if (!(p = lock_user(VERIFY_WRITE, arg3, sizeof(target_sigset_t), 0)))
                    goto efault;
                host_to_target_old_sigset(p, &oldset);
                unlock_user(p, arg3, sizeof(target_sigset_t));
            }
        }
        break;
#endif
    case TARGET_NR_rt_sigprocmask:
        {
            int how = arg1;
            sigset_t set, oldset, *set_ptr;

            if (arg2) {
                switch(how) {
                case TARGET_SIG_BLOCK:
                    how = SIG_BLOCK;
                    break;
                case TARGET_SIG_UNBLOCK:
                    how = SIG_UNBLOCK;
                    break;
                case TARGET_SIG_SETMASK:
                    how = SIG_SETMASK;
                    break;
                default:
                    ret = -TARGET_EINVAL;
                    goto fail;
                }
                if (!(p = lock_user(VERIFY_READ, arg2, sizeof(target_sigset_t), 1)))
                    goto efault;
                target_to_host_sigset(&set, p);
                unlock_user(p, arg2, 0);
                set_ptr = &set;
            } else {
                how = 0;
                set_ptr = NULL;
            }
            ret = get_errno(sigprocmask(how, set_ptr, &oldset));
            if (!is_error(ret) && arg3) {
                if (!(p = lock_user(VERIFY_WRITE, arg3, sizeof(target_sigset_t), 0)))
                    goto efault;
                host_to_target_sigset(p, &oldset);
                unlock_user(p, arg3, sizeof(target_sigset_t));
            }
        }
        break;
#ifdef TARGET_NR_sigpending
    case TARGET_NR_sigpending:
        {
            sigset_t set;
            ret = get_errno(sigpending(&set));
            if (!is_error(ret)) {
                if (!(p = lock_user(VERIFY_WRITE, arg1, sizeof(target_sigset_t), 0)))
                    goto efault;
                host_to_target_old_sigset(p, &set);
                unlock_user(p, arg1, sizeof(target_sigset_t));
            }
        }
        break;
#endif
    case TARGET_NR_rt_sigpending:
        {
            sigset_t set;
            ret = get_errno(sigpending(&set));
            if (!is_error(ret)) {
                if (!(p = lock_user(VERIFY_WRITE, arg1, sizeof(target_sigset_t), 0)))
                    goto efault;
                host_to_target_sigset(p, &set);
                unlock_user(p, arg1, sizeof(target_sigset_t));
            }
        }
        break;
#ifdef TARGET_NR_sigsuspend
    case TARGET_NR_sigsuspend:
        {
            sigset_t set;
            if (!(p = lock_user(VERIFY_READ, arg1, sizeof(target_sigset_t), 1)))
                goto efault;
            target_to_host_old_sigset(&set, p);
            unlock_user(p, arg1, 0);
            ret = get_errno(sigsuspend(&set));
        }
        break;
#endif
    case TARGET_NR_rt_sigsuspend:
        {
            sigset_t set;
            if (!(p = lock_user(VERIFY_READ, arg1, sizeof(target_sigset_t), 1)))
                goto efault;
            target_to_host_sigset(&set, p);
            unlock_user(p, arg1, 0);
            ret = get_errno(sigsuspend(&set));
        }
        break;
    case TARGET_NR_rt_sigtimedwait:
        {
            sigset_t set;
            struct timespec uts, *puts;
            siginfo_t uinfo;

            if (!(p = lock_user(VERIFY_READ, arg1, sizeof(target_sigset_t), 1)))
                goto efault;
            target_to_host_sigset(&set, p);
            unlock_user(p, arg1, 0);
            if (arg3) {
                puts = &uts;
                target_to_host_timespec(puts, arg3);
            } else {
                puts = NULL;
            }
            ret = get_errno(sigtimedwait(&set, &uinfo, puts));
            if (!is_error(ret) && arg2) {
                if (!(p = lock_user(VERIFY_WRITE, arg2, sizeof(target_siginfo_t), 0)))
                    goto efault;
                host_to_target_siginfo(p, &uinfo);
                unlock_user(p, arg2, sizeof(target_siginfo_t));
            }
        }
        break;
    case TARGET_NR_rt_sigqueueinfo:
        {
            siginfo_t uinfo;
            if (!(p = lock_user(VERIFY_READ, arg3, sizeof(target_sigset_t), 1)))
                goto efault;
            target_to_host_siginfo(&uinfo, p);
            unlock_user(p, arg1, 0);
            ret = get_errno(sys_rt_sigqueueinfo(arg1, arg2, &uinfo));
        }
        break;
#ifdef TARGET_NR_sigreturn
    case TARGET_NR_sigreturn:
        /* NOTE: ret is eax, so not transcoding must be done */
        ret = do_sigreturn(cpu_env);
        break;
#endif
    case TARGET_NR_rt_sigreturn:
        /* NOTE: ret is eax, so not transcoding must be done */
        ret = do_rt_sigreturn(cpu_env);
        break;
    case TARGET_NR_sethostname:
        if (!(p = lock_user_string(arg1)))
            goto efault;
        ret = get_errno(sethostname(p, arg2));
        unlock_user(p, arg1, 0);
        break;
    case TARGET_NR_setrlimit:
        {
            /* XXX: convert resource ? */
            int resource = arg1;
            struct target_rlimit *target_rlim;
            struct rlimit rlim;
            if (!lock_user_struct(VERIFY_READ, target_rlim, arg2, 1))
                goto efault;
            rlim.rlim_cur = tswapl(target_rlim->rlim_cur);
            rlim.rlim_max = tswapl(target_rlim->rlim_max);
            unlock_user_struct(target_rlim, arg2, 0);
            ret = get_errno(setrlimit(resource, &rlim));
        }
        break;
    case TARGET_NR_getrlimit:
        {
            /* XXX: convert resource ? */
            int resource = arg1;
            struct target_rlimit *target_rlim;
            struct rlimit rlim;

            ret = get_errno(getrlimit(resource, &rlim));
            if (!is_error(ret)) {
                if (!lock_user_struct(VERIFY_WRITE, target_rlim, arg2, 0))
                    goto efault;
                target_rlim->rlim_cur = tswapl(rlim.rlim_cur);
                target_rlim->rlim_max = tswapl(rlim.rlim_max);
                unlock_user_struct(target_rlim, arg2, 1);
            }
        }
        break;
    case TARGET_NR_getrusage:
        {
            struct rusage rusage;
            ret = get_errno(getrusage(arg1, &rusage));
            if (!is_error(ret)) {
                host_to_target_rusage(arg2, &rusage);
            }
        }
        break;
    case TARGET_NR_gettimeofday:
        {
            struct timeval tv;
            ret = get_errno(gettimeofday(&tv, NULL));
            if (!is_error(ret)) {
                if (copy_to_user_timeval(arg1, &tv))
                    goto efault;
            }
        }
        break;
    case TARGET_NR_settimeofday:
        {
            struct timeval tv;
            if (copy_from_user_timeval(&tv, arg1))
                goto efault;
            ret = get_errno(settimeofday(&tv, NULL));
        }
        break;
#ifdef TARGET_NR_select
    case TARGET_NR_select:
        {
            struct target_sel_arg_struct *sel;
            abi_ulong inp, outp, exp, tvp;
            long nsel;

            if (!lock_user_struct(VERIFY_READ, sel, arg1, 1))
                goto efault;
            nsel = tswapl(sel->n);
            inp = tswapl(sel->inp);
            outp = tswapl(sel->outp);
            exp = tswapl(sel->exp);
            tvp = tswapl(sel->tvp);
            unlock_user_struct(sel, arg1, 0);
            ret = do_select(nsel, inp, outp, exp, tvp);
        }
        break;
#endif
    case TARGET_NR_symlink:
        {
            void *p2;
            p = lock_user_string(arg1);
            p2 = lock_user_string(arg2);
            if (!p || !p2)
                ret = -TARGET_EFAULT;
            else
                ret = get_errno(symlink(p, p2));
            unlock_user(p2, arg2, 0);
            unlock_user(p, arg1, 0);
        }
        break;
#if defined(TARGET_NR_symlinkat) && defined(__NR_symlinkat)
    case TARGET_NR_symlinkat:
        {
            void *p2;
            p  = lock_user_string(arg1);
            p2 = lock_user_string(arg3);
            if (!p || !p2)
                ret = -TARGET_EFAULT;
            else
                ret = get_errno(sys_symlinkat(p, arg2, p2));
            unlock_user(p2, arg3, 0);
            unlock_user(p, arg1, 0);
        }
        break;
#endif
#ifdef TARGET_NR_oldlstat
    case TARGET_NR_oldlstat:
        goto unimplemented;
#endif
    case TARGET_NR_readlink:
        {
            void *p2, *temp;
            p = lock_user_string(arg1);
            p2 = lock_user(VERIFY_WRITE, arg2, arg3, 0);
            if (!p || !p2)
                ret = -TARGET_EFAULT;
            else {
                if (strncmp((const char *)p, "/proc/self/exe", 14) == 0) {
                    char real[PATH_MAX];
                    temp = realpath(exec_path,real);
                    ret = (temp==NULL) ? get_errno(-1) : strlen(real) ;
                    snprintf((char *)p2, arg3, "%s", real);
                    }
                else
                    ret = get_errno(readlink(path(p), p2, arg3));
            }
            unlock_user(p2, arg2, ret);
            unlock_user(p, arg1, 0);
        }
        break;
#if defined(TARGET_NR_readlinkat) && defined(__NR_readlinkat)
    case TARGET_NR_readlinkat:
        {
            void *p2;
            p  = lock_user_string(arg2);
            p2 = lock_user(VERIFY_WRITE, arg3, arg4, 0);
            if (!p || !p2)
        	ret = -TARGET_EFAULT;
            else
                ret = get_errno(sys_readlinkat(arg1, path(p), p2, arg4));
            unlock_user(p2, arg3, ret);
            unlock_user(p, arg2, 0);
        }
        break;
#endif
#ifdef TARGET_NR_uselib
    case TARGET_NR_uselib:
        goto unimplemented;
#endif
#ifdef TARGET_NR_swapon
    case TARGET_NR_swapon:
        if (!(p = lock_user_string(arg1)))
            goto efault;
        ret = get_errno(swapon(p, arg2));
        unlock_user(p, arg1, 0);
        break;
#endif
    case TARGET_NR_reboot:
        goto unimplemented;
#ifdef TARGET_NR_readdir
    case TARGET_NR_readdir:
        goto unimplemented;
#endif
#ifdef TARGET_NR_mmap
    case TARGET_NR_mmap:
#if (defined(TARGET_I386) && defined(TARGET_ABI32)) || defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_CRIS) || defined(TARGET_MICROBLAZE)
        {
            abi_ulong *v;
            abi_ulong v1, v2, v3, v4, v5, v6;
            if (!(v = lock_user(VERIFY_READ, arg1, 6 * sizeof(abi_ulong), 1)))
                goto efault;
            v1 = tswapl(v[0]);
            v2 = tswapl(v[1]);
            v3 = tswapl(v[2]);
            v4 = tswapl(v[3]);
            v5 = tswapl(v[4]);
            v6 = tswapl(v[5]);
            unlock_user(v, arg1, 0);
            ret = get_errno(target_mmap(v1, v2, v3,
                                        target_to_host_bitmask(v4, mmap_flags_tbl),
                                        v5, v6));
        }
#else
        ret = get_errno(target_mmap(arg1, arg2, arg3,
                                    target_to_host_bitmask(arg4, mmap_flags_tbl),
                                    arg5,
                                    arg6));
#endif
        break;
#endif
#ifdef TARGET_NR_mmap2
    case TARGET_NR_mmap2:
#ifndef MMAP_SHIFT
#define MMAP_SHIFT 12
#endif
        ret = get_errno(target_mmap(arg1, arg2, arg3,
                                    target_to_host_bitmask(arg4, mmap_flags_tbl),
                                    arg5,
                                    arg6 << MMAP_SHIFT));
        break;
#endif
    case TARGET_NR_munmap:
        ret = get_errno(target_munmap(arg1, arg2));
        break;
    case TARGET_NR_mprotect:
        ret = get_errno(target_mprotect(arg1, arg2, arg3));
        break;
#ifdef TARGET_NR_mremap
    case TARGET_NR_mremap:
        ret = get_errno(target_mremap(arg1, arg2, arg3, arg4, arg5));
        break;
#endif
        /* ??? msync/mlock/munlock are broken for softmmu.  */
#ifdef TARGET_NR_msync
    case TARGET_NR_msync:
        ret = get_errno(msync(g2h(arg1), arg2, arg3));
        break;
#endif
#ifdef TARGET_NR_mlock
    case TARGET_NR_mlock:
        ret = get_errno(mlock(g2h(arg1), arg2));
        break;
#endif
#ifdef TARGET_NR_munlock
    case TARGET_NR_munlock:
        ret = get_errno(munlock(g2h(arg1), arg2));
        break;
#endif
#ifdef TARGET_NR_mlockall
    case TARGET_NR_mlockall:
        ret = get_errno(mlockall(arg1));
        break;
#endif
#ifdef TARGET_NR_munlockall
    case TARGET_NR_munlockall:
        ret = get_errno(munlockall());
        break;
#endif
    case TARGET_NR_truncate:
        if (!(p = lock_user_string(arg1)))
            goto efault;
        ret = get_errno(truncate(p, arg2));
        unlock_user(p, arg1, 0);
        break;
    case TARGET_NR_ftruncate:
        ret = get_errno(ftruncate(arg1, arg2));
        break;
    case TARGET_NR_fchmod:
        ret = get_errno(fchmod(arg1, arg2));
        break;
#if defined(TARGET_NR_fchmodat) && defined(__NR_fchmodat)
    case TARGET_NR_fchmodat:
        if (!(p = lock_user_string(arg2)))
            goto efault;
        ret = get_errno(sys_fchmodat(arg1, p, arg3));
        unlock_user(p, arg2, 0);
        break;
#endif
    case TARGET_NR_getpriority:
        /* libc does special remapping of the return value of
         * sys_getpriority() so it's just easiest to call
         * sys_getpriority() directly rather than through libc. */
        ret = get_errno(sys_getpriority(arg1, arg2));
        break;
    case TARGET_NR_setpriority:
        ret = get_errno(setpriority(arg1, arg2, arg3));
        break;
#ifdef TARGET_NR_profil
    case TARGET_NR_profil:
        goto unimplemented;
#endif
    case TARGET_NR_statfs:
        if (!(p = lock_user_string(arg1)))
            goto efault;
        ret = get_errno(statfs(path(p), &stfs));
        unlock_user(p, arg1, 0);
    convert_statfs:
        if (!is_error(ret)) {
            struct target_statfs *target_stfs;

            if (!lock_user_struct(VERIFY_WRITE, target_stfs, arg2, 0))
                goto efault;
            __put_user(stfs.f_type, &target_stfs->f_type);
            __put_user(stfs.f_bsize, &target_stfs->f_bsize);
            __put_user(stfs.f_blocks, &target_stfs->f_blocks);
            __put_user(stfs.f_bfree, &target_stfs->f_bfree);
            __put_user(stfs.f_bavail, &target_stfs->f_bavail);
            __put_user(stfs.f_files, &target_stfs->f_files);
            __put_user(stfs.f_ffree, &target_stfs->f_ffree);
            __put_user(stfs.f_fsid.__val[0], &target_stfs->f_fsid.val[0]);
            __put_user(stfs.f_fsid.__val[1], &target_stfs->f_fsid.val[1]);
            __put_user(stfs.f_namelen, &target_stfs->f_namelen);
            unlock_user_struct(target_stfs, arg2, 1);
        }
        break;
    case TARGET_NR_fstatfs:
        ret = get_errno(fstatfs(arg1, &stfs));
        goto convert_statfs;
#ifdef TARGET_NR_statfs64
    case TARGET_NR_statfs64:
        if (!(p = lock_user_string(arg1)))
            goto efault;
        ret = get_errno(statfs(path(p), &stfs));
        unlock_user(p, arg1, 0);
    convert_statfs64:
        if (!is_error(ret)) {
            struct target_statfs64 *target_stfs;

            if (!lock_user_struct(VERIFY_WRITE, target_stfs, arg3, 0))
                goto efault;
            __put_user(stfs.f_type, &target_stfs->f_type);
            __put_user(stfs.f_bsize, &target_stfs->f_bsize);
            __put_user(stfs.f_blocks, &target_stfs->f_blocks);
            __put_user(stfs.f_bfree, &target_stfs->f_bfree);
            __put_user(stfs.f_bavail, &target_stfs->f_bavail);
            __put_user(stfs.f_files, &target_stfs->f_files);
            __put_user(stfs.f_ffree, &target_stfs->f_ffree);
            __put_user(stfs.f_fsid.__val[0], &target_stfs->f_fsid.val[0]);
            __put_user(stfs.f_fsid.__val[1], &target_stfs->f_fsid.val[1]);
            __put_user(stfs.f_namelen, &target_stfs->f_namelen);
            unlock_user_struct(target_stfs, arg3, 1);
        }
        break;
    case TARGET_NR_fstatfs64:
        ret = get_errno(fstatfs(arg1, &stfs));
        goto convert_statfs64;
#endif
#ifdef TARGET_NR_ioperm
    case TARGET_NR_ioperm:
        goto unimplemented;
#endif
#ifdef TARGET_NR_socketcall
    case TARGET_NR_socketcall:
        ret = do_socketcall(arg1, arg2);
        break;
#endif
#ifdef TARGET_NR_accept
    case TARGET_NR_accept:
        ret = do_accept(arg1, arg2, arg3);
        break;
#endif
#ifdef TARGET_NR_bind
    case TARGET_NR_bind:
        ret = do_bind(arg1, arg2, arg3);
        break;
#endif
#ifdef TARGET_NR_connect
    case TARGET_NR_connect:
        ret = do_connect(arg1, arg2, arg3);
        break;
#endif
#ifdef TARGET_NR_getpeername
    case TARGET_NR_getpeername:
        ret = do_getpeername(arg1, arg2, arg3);
        break;
#endif