syscall.c 76.6 KB
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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, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
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#include <string.h>
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#include <elf.h>
#include <endian.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
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#include <time.h>
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#include <sys/types.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/mount.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/uio.h>
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#include <sys/poll.h>
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#include <sys/times.h>
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//#include <sys/user.h>
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#include <netinet/tcp.h>
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#define termios host_termios
#define winsize host_winsize
#define termio host_termio
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#define sgttyb host_sgttyb /* same as target */
#define tchars host_tchars /* same as target */
#define ltchars host_ltchars /* same as target */
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#include <linux/termios.h>
#include <linux/unistd.h>
#include <linux/utsname.h>
#include <linux/cdrom.h>
#include <linux/hdreg.h>
#include <linux/soundcard.h>
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#include <linux/dirent.h>
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#include <linux/kd.h>
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#include "qemu.h"
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//#define DEBUG
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//#include <linux/msdos_fs.h>
#define	VFAT_IOCTL_READDIR_BOTH		_IOR('r', 1, struct dirent [2])
#define	VFAT_IOCTL_READDIR_SHORT	_IOR('r', 2, struct dirent [2])

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void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info);
void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo);
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long do_sigreturn(CPUX86State *env);
long do_rt_sigreturn(CPUX86State *env);

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#define __NR_sys_uname __NR_uname
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#define __NR_sys_getcwd1 __NR_getcwd
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#define __NR_sys_statfs __NR_statfs
#define __NR_sys_fstatfs __NR_fstatfs
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#define __NR_sys_getdents __NR_getdents
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#define __NR_sys_getdents64 __NR_getdents64
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#define __NR_sys_rt_sigqueueinfo __NR_rt_sigqueueinfo
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#if defined(__alpha__) || defined (__ia64__)
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#define __NR__llseek __NR_lseek
#endif

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#ifdef __NR_gettid
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_syscall0(int, gettid)
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#else
static int gettid(void) {
    return -ENOSYS;
}
#endif
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_syscall1(int,sys_uname,struct new_utsname *,buf)
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_syscall2(int,sys_getcwd1,char *,buf,size_t,size)
_syscall3(int, sys_getdents, uint, fd, struct dirent *, dirp, uint, count);
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_syscall3(int, sys_getdents64, uint, fd, struct dirent64 *, dirp, uint, count);
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_syscall5(int, _llseek,  uint,  fd, ulong, hi, ulong, lo,
          loff_t *, res, uint, wh);
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_syscall2(int,sys_statfs,const char *,path,struct kernel_statfs *,buf)
_syscall2(int,sys_fstatfs,int,fd,struct kernel_statfs *,buf)
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_syscall3(int,sys_rt_sigqueueinfo,int,pid,int,sig,siginfo_t *,uinfo)
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#ifdef __NR_exit_group
_syscall1(int,exit_group,int,error_code)
#endif
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extern int personality(int);
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extern int flock(int, int);
extern int setfsuid(int);
extern int setfsgid(int);
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extern int setresuid(uid_t, uid_t, uid_t);
extern int getresuid(uid_t *, uid_t *, uid_t *);
extern int setresgid(gid_t, gid_t, gid_t);
extern int getresgid(gid_t *, gid_t *, gid_t *);
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extern int setgroups(int, gid_t *);
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static inline long get_errno(long ret)
{
    if (ret == -1)
        return -errno;
    else
        return ret;
}

static inline int is_error(long ret)
{
    return (unsigned long)ret >= (unsigned long)(-4096);
}

static char *target_brk;
static char *target_original_brk;

void target_set_brk(char *new_brk)
{
    target_brk = new_brk;
    target_original_brk = new_brk;
}

static long do_brk(char *new_brk)
{
    char *brk_page;
    long mapped_addr;
    int	new_alloc_size;

    if (!new_brk)
        return (long)target_brk;
    if (new_brk < target_original_brk)
        return -ENOMEM;
    
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    brk_page = (char *)HOST_PAGE_ALIGN((unsigned long)target_brk);
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    /* If the new brk is less than this, set it and we're done... */
    if (new_brk < brk_page) {
	target_brk = new_brk;
    	return (long)target_brk;
    }

    /* We need to allocate more memory after the brk... */
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    new_alloc_size = HOST_PAGE_ALIGN(new_brk - brk_page + 1);
    mapped_addr = get_errno(target_mmap((unsigned long)brk_page, new_alloc_size, 
                                        PROT_READ|PROT_WRITE,
                                        MAP_ANON|MAP_FIXED|MAP_PRIVATE, 0, 0));
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    if (is_error(mapped_addr)) {
	return mapped_addr;
    } else {
	target_brk = new_brk;
    	return (long)target_brk;
    }
}

static inline fd_set *target_to_host_fds(fd_set *fds, 
                                         target_long *target_fds, int n)
{
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#if !defined(BSWAP_NEEDED) && !defined(WORDS_BIGENDIAN)
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    return (fd_set *)target_fds;
#else
    int i, b;
    if (target_fds) {
        FD_ZERO(fds);
        for(i = 0;i < n; i++) {
            b = (tswapl(target_fds[i / TARGET_LONG_BITS]) >>
                 (i & (TARGET_LONG_BITS - 1))) & 1;
            if (b)
                FD_SET(i, fds);
        }
        return fds;
    } else {
        return NULL;
    }
#endif
}

static inline void host_to_target_fds(target_long *target_fds, 
                                      fd_set *fds, int n)
{
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#if !defined(BSWAP_NEEDED) && !defined(WORDS_BIGENDIAN)
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    /* nothing to do */
#else
    int i, nw, j, k;
    target_long v;

    if (target_fds) {
        nw = n / TARGET_LONG_BITS;
        k = 0;
        for(i = 0;i < nw; i++) {
            v = 0;
            for(j = 0; j < TARGET_LONG_BITS; j++) {
                v |= ((FD_ISSET(k, fds) != 0) << j);
                k++;
            }
            target_fds[i] = tswapl(v);
        }
    }
#endif
}

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static inline void target_to_host_timeval(struct timeval *tv, 
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                                          const struct target_timeval *target_tv)
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{
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    tv->tv_sec = tswapl(target_tv->tv_sec);
    tv->tv_usec = tswapl(target_tv->tv_usec);
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}

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static inline void host_to_target_timeval(struct target_timeval *target_tv, 
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                                          const struct timeval *tv)
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{
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    target_tv->tv_sec = tswapl(tv->tv_sec);
    target_tv->tv_usec = tswapl(tv->tv_usec);
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}


static long do_select(long n, 
                      target_long *target_rfds, target_long *target_wfds, 
                      target_long *target_efds, struct target_timeval *target_tv)
{
    fd_set rfds, wfds, efds;
    fd_set *rfds_ptr, *wfds_ptr, *efds_ptr;
    struct timeval tv, *tv_ptr;
    long ret;

    rfds_ptr = target_to_host_fds(&rfds, target_rfds, n);
    wfds_ptr = target_to_host_fds(&wfds, target_wfds, n);
    efds_ptr = target_to_host_fds(&efds, target_efds, n);
            
    if (target_tv) {
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        target_to_host_timeval(&tv, target_tv);
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        tv_ptr = &tv;
    } else {
        tv_ptr = NULL;
    }
    ret = get_errno(select(n, rfds_ptr, wfds_ptr, efds_ptr, tv_ptr));
    if (!is_error(ret)) {
        host_to_target_fds(target_rfds, rfds_ptr, n);
        host_to_target_fds(target_wfds, wfds_ptr, n);
        host_to_target_fds(target_efds, efds_ptr, n);

        if (target_tv) {
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            host_to_target_timeval(target_tv, &tv);
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        }
    }
    return ret;
}

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static inline void target_to_host_sockaddr(struct sockaddr *addr,
                                           struct target_sockaddr *target_addr,
                                           socklen_t len)
{
    memcpy(addr, target_addr, len);
    addr->sa_family = tswap16(target_addr->sa_family);
}

static inline void host_to_target_sockaddr(struct target_sockaddr *target_addr,
                                           struct sockaddr *addr,
                                           socklen_t len)
{
    memcpy(target_addr, addr, len);
    target_addr->sa_family = tswap16(addr->sa_family);
}

static inline void target_to_host_cmsg(struct msghdr *msgh,
                                       struct target_msghdr *target_msgh)
{
    struct cmsghdr *cmsg = CMSG_FIRSTHDR(msgh);
    struct target_cmsghdr *target_cmsg = TARGET_CMSG_FIRSTHDR(target_msgh);
    socklen_t space = 0;

    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");
            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 != 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);
    }

    msgh->msg_controllen = space;
}

static inline void host_to_target_cmsg(struct target_msghdr *target_msgh,
                                       struct msghdr *msgh)
{
    struct cmsghdr *cmsg = CMSG_FIRSTHDR(msgh);
    struct target_cmsghdr *target_cmsg = TARGET_CMSG_FIRSTHDR(target_msgh);
    socklen_t space = 0;

    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 > tswapl(target_msgh->msg_controllen)) {
            space -= TARGET_CMSG_SPACE(len);
            gemu_log("Target cmsg overflow");
            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 != 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);
    }

    msgh->msg_controllen = tswapl(space);
}

static long do_setsockopt(int sockfd, int level, int optname, 
                          void *optval, socklen_t optlen)
{
    if (level == SOL_TCP) {
        /* TCP options all take an 'int' value.  */
        int val;

        if (optlen < sizeof(uint32_t))
            return -EINVAL;

        val = tswap32(*(uint32_t *)optval);
        return get_errno(setsockopt(sockfd, level, optname, &val, sizeof(val)));
    }

    else if (level != SOL_SOCKET) {
        gemu_log("Unsupported setsockopt level: %d\n", level);
        return -ENOSYS;
    }

    switch (optname) {
    /* Options with 'int' argument.  */
    case SO_DEBUG:
    case SO_REUSEADDR:
    case SO_TYPE:
    case SO_ERROR:
    case SO_DONTROUTE:
    case SO_BROADCAST:
    case SO_SNDBUF:
    case SO_RCVBUF:
    case SO_KEEPALIVE:
    case SO_OOBINLINE:
    case SO_NO_CHECK:
    case SO_PRIORITY:
    case SO_BSDCOMPAT:
    case SO_PASSCRED:
    case SO_TIMESTAMP:
    case SO_RCVLOWAT:
    case SO_RCVTIMEO:
    case SO_SNDTIMEO:
    {
        int val;
        if (optlen < sizeof(uint32_t))
            return -EINVAL;
        val = tswap32(*(uint32_t *)optval);
        return get_errno(setsockopt(sockfd, level, optname, &val, sizeof(val)));
    }

    default:
        gemu_log("Unsupported setsockopt SOL_SOCKET option: %d\n", optname);
        return -ENOSYS;
    }
}

static long do_getsockopt(int sockfd, int level, int optname, 
                          void *optval, socklen_t *optlen)
{
    gemu_log("getsockopt not yet supported\n");
    return -ENOSYS;
}

static long do_socketcall(int num, int32_t *vptr)
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{
    long ret;

    switch(num) {
    case SOCKOP_socket:
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	{
            int domain = tswap32(vptr[0]);
            int type = tswap32(vptr[1]);
            int protocol = tswap32(vptr[2]);

            ret = get_errno(socket(domain, type, protocol));
	}
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        break;
    case SOCKOP_bind:
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	{
            int sockfd = tswap32(vptr[0]);
            void *target_addr = (void *)tswap32(vptr[1]);
            socklen_t addrlen = tswap32(vptr[2]);
            void *addr = alloca(addrlen);

            target_to_host_sockaddr(addr, target_addr, addrlen);
            ret = get_errno(bind(sockfd, addr, addrlen));
        }
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        break;
    case SOCKOP_connect:
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        {
            int sockfd = tswap32(vptr[0]);
            void *target_addr = (void *)tswap32(vptr[1]);
            socklen_t addrlen = tswap32(vptr[2]);
            void *addr = alloca(addrlen);

            target_to_host_sockaddr(addr, target_addr, addrlen);
            ret = get_errno(connect(sockfd, addr, addrlen));
        }
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        break;
    case SOCKOP_listen:
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        {
            int sockfd = tswap32(vptr[0]);
            int backlog = tswap32(vptr[1]);

            ret = get_errno(listen(sockfd, backlog));
        }
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        break;
    case SOCKOP_accept:
        {
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            int sockfd = tswap32(vptr[0]);
            void *target_addr = (void *)tswap32(vptr[1]);
            uint32_t *target_addrlen = (void *)tswap32(vptr[2]);
            socklen_t addrlen = tswap32(*target_addrlen);
            void *addr = alloca(addrlen);

            ret = get_errno(accept(sockfd, addr, &addrlen));
            if (!is_error(ret)) {
                host_to_target_sockaddr(target_addr, addr, addrlen);
                *target_addrlen = tswap32(addrlen);
            }
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        }
        break;
    case SOCKOP_getsockname:
        {
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            int sockfd = tswap32(vptr[0]);
            void *target_addr = (void *)tswap32(vptr[1]);
            uint32_t *target_addrlen = (void *)tswap32(vptr[2]);
            socklen_t addrlen = tswap32(*target_addrlen);
            void *addr = alloca(addrlen);

            ret = get_errno(getsockname(sockfd, addr, &addrlen));
            if (!is_error(ret)) {
                host_to_target_sockaddr(target_addr, addr, addrlen);
                *target_addrlen = tswap32(addrlen);
            }
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        }
        break;
    case SOCKOP_getpeername:
        {
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            int sockfd = tswap32(vptr[0]);
            void *target_addr = (void *)tswap32(vptr[1]);
            uint32_t *target_addrlen = (void *)tswap32(vptr[2]);
            socklen_t addrlen = tswap32(*target_addrlen);
            void *addr = alloca(addrlen);

            ret = get_errno(getpeername(sockfd, addr, &addrlen));
            if (!is_error(ret)) {
                host_to_target_sockaddr(target_addr, addr, addrlen);
                *target_addrlen = tswap32(addrlen);
            }
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        }
        break;
    case SOCKOP_socketpair:
        {
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            int domain = tswap32(vptr[0]);
            int type = tswap32(vptr[1]);
            int protocol = tswap32(vptr[2]);
            int32_t *target_tab = (void *)tswap32(vptr[3]);
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            int tab[2];
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            ret = get_errno(socketpair(domain, type, protocol, tab));
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            if (!is_error(ret)) {
                target_tab[0] = tswap32(tab[0]);
                target_tab[1] = tswap32(tab[1]);
            }
        }
        break;
    case SOCKOP_send:
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        {
            int sockfd = tswap32(vptr[0]);
            void *msg = (void *)tswap32(vptr[1]);
            size_t len = tswap32(vptr[2]);
            int flags = tswap32(vptr[3]);

            ret = get_errno(send(sockfd, msg, len, flags));
        }
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        break;
    case SOCKOP_recv:
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        {
            int sockfd = tswap32(vptr[0]);
            void *msg = (void *)tswap32(vptr[1]);
            size_t len = tswap32(vptr[2]);
            int flags = tswap32(vptr[3]);

            ret = get_errno(recv(sockfd, msg, len, flags));
        }
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        break;
    case SOCKOP_sendto:
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        {
            int sockfd = tswap32(vptr[0]);
            void *msg = (void *)tswap32(vptr[1]);
            size_t len = tswap32(vptr[2]);
            int flags = tswap32(vptr[3]);
            void *target_addr = (void *)tswap32(vptr[4]);
            socklen_t addrlen = tswap32(vptr[5]);
            void *addr = alloca(addrlen);

            target_to_host_sockaddr(addr, target_addr, addrlen);
            ret = get_errno(sendto(sockfd, msg, len, flags, addr, addrlen));
        }
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        break;
    case SOCKOP_recvfrom:
        {
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            int sockfd = tswap32(vptr[0]);
            void *msg = (void *)tswap32(vptr[1]);
            size_t len = tswap32(vptr[2]);
            int flags = tswap32(vptr[3]);
            void *target_addr = (void *)tswap32(vptr[4]);
            uint32_t *target_addrlen = (void *)tswap32(vptr[5]);
            socklen_t addrlen = tswap32(*target_addrlen);
            void *addr = alloca(addrlen);

            ret = get_errno(recvfrom(sockfd, msg, len, flags, addr, &addrlen));
            if (!is_error(ret)) {
                host_to_target_sockaddr(target_addr, addr, addrlen);
                *target_addrlen = tswap32(addrlen);
            }
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        }
        break;
    case SOCKOP_shutdown:
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        {
            int sockfd = tswap32(vptr[0]);
            int how = tswap32(vptr[1]);

            ret = get_errno(shutdown(sockfd, how));
        }
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        break;
    case SOCKOP_sendmsg:
    case SOCKOP_recvmsg:
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        {
            int fd;
            struct target_msghdr *msgp;
            struct msghdr msg;
            int flags, count, i;
            struct iovec *vec;
            struct target_iovec *target_vec;

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            msgp = (void *)tswap32(vptr[1]);
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            msg.msg_name = (void *)tswapl(msgp->msg_name);
            msg.msg_namelen = tswapl(msgp->msg_namelen);
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            msg.msg_controllen = 2 * tswapl(msgp->msg_controllen);
            msg.msg_control = alloca(msg.msg_controllen);
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            msg.msg_flags = tswap32(msgp->msg_flags);

            count = tswapl(msgp->msg_iovlen);
            vec = alloca(count * sizeof(struct iovec));
            target_vec = (void *)tswapl(msgp->msg_iov);
            for(i = 0;i < count; i++) {
                vec[i].iov_base = (void *)tswapl(target_vec[i].iov_base);
                vec[i].iov_len = tswapl(target_vec[i].iov_len);
            }
            msg.msg_iovlen = count;
            msg.msg_iov = vec;

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            fd = tswap32(vptr[0]);
            flags = tswap32(vptr[2]);
            if (num == SOCKOP_sendmsg) {
                target_to_host_cmsg(&msg, msgp);
                ret = get_errno(sendmsg(fd, &msg, flags));
            } else {
                ret = get_errno(recvmsg(fd, &msg, flags));
                if (!is_error(ret))
                  host_to_target_cmsg(msgp, &msg);
            }
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        }
        break;
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    case SOCKOP_setsockopt:
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        {
            int sockfd = tswap32(vptr[0]);
            int level = tswap32(vptr[1]);
            int optname = tswap32(vptr[2]);
            void *optval = (void *)tswap32(vptr[3]);
            socklen_t optlen = tswap32(vptr[4]);

            ret = do_setsockopt(sockfd, level, optname, optval, optlen);
        }
        break;
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    case SOCKOP_getsockopt:
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        {
            int sockfd = tswap32(vptr[0]);
            int level = tswap32(vptr[1]);
            int optname = tswap32(vptr[2]);
            void *optval = (void *)tswap32(vptr[3]);
            uint32_t *target_len = (void *)tswap32(vptr[4]);
            socklen_t optlen = tswap32(*target_len);

            ret = do_getsockopt(sockfd, level, optname, optval, &optlen);
            if (!is_error(ret))
                *target_len = tswap32(optlen);
        }
        break;
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    default:
        gemu_log("Unsupported socketcall: %d\n", num);
        ret = -ENOSYS;
        break;
    }
    return ret;
}

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

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

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

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

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

#define MAX_STRUCT_SIZE 4096

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

static long do_ioctl(long fd, long cmd, long arg)
{
    const IOCTLEntry *ie;
    const argtype *arg_type;
    long ret;
    uint8_t buf_temp[MAX_STRUCT_SIZE];

    ie = ioctl_entries;
    for(;;) {
        if (ie->target_cmd == 0) {
            gemu_log("Unsupported ioctl: cmd=0x%04lx\n", cmd);
            return -ENOSYS;
        }
        if (ie->target_cmd == cmd)
            break;
        ie++;
    }
    arg_type = ie->arg_type;
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#if defined(DEBUG)
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    gemu_log("ioctl: cmd=0x%04lx (%s)\n", cmd, ie->name);
#endif
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    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++;
        switch(ie->access) {
        case IOC_R:
            ret = get_errno(ioctl(fd, ie->host_cmd, buf_temp));
            if (!is_error(ret)) {
                thunk_convert((void *)arg, buf_temp, arg_type, THUNK_TARGET);
            }
            break;
        case IOC_W:
            thunk_convert(buf_temp, (void *)arg, arg_type, THUNK_HOST);
            ret = get_errno(ioctl(fd, ie->host_cmd, buf_temp));
            break;
        default:
        case IOC_RW:
            thunk_convert(buf_temp, (void *)arg, arg_type, THUNK_HOST);
            ret = get_errno(ioctl(fd, ie->host_cmd, buf_temp));
            if (!is_error(ret)) {
                thunk_convert((void *)arg, buf_temp, arg_type, THUNK_TARGET);
            }
            break;
        }
        break;
    default:
        gemu_log("Unsupported ioctl type: cmd=0x%04lx type=%d\n", cmd, arg_type[0]);
        ret = -ENOSYS;
        break;
    }
    return ret;
}

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 }
};

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 }
};

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 }
};

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;
    
    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;
  
    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];
}

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) },
};

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#ifdef TARGET_I386

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

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

    if (!ldt_table)
        return 0;
    size = TARGET_LDT_ENTRIES * TARGET_LDT_ENTRY_SIZE;
    if (size > bytecount)
        size = bytecount;
    memcpy(ptr, ldt_table, size);
    return size;
}

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

    if (bytecount != sizeof(ldt_info))
        return -EINVAL;
    memcpy(&ldt_info, ptr, sizeof(ldt_info));
    tswap32s(&ldt_info.entry_number);
    tswapls((long *)&ldt_info.base_addr);
    tswap32s(&ldt_info.limit);
    tswap32s(&ldt_info.flags);
    
    if (ldt_info.entry_number >= TARGET_LDT_ENTRIES)
        return -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;

    if (contents == 3) {
        if (oldmode)
            return -EINVAL;
        if (seg_not_present == 0)
            return -EINVAL;
    }
    /* allocate the LDT */
    if (!ldt_table) {
        ldt_table = malloc(TARGET_LDT_ENTRIES * TARGET_LDT_ENTRY_SIZE);
        if (!ldt_table)
            return -ENOMEM;
        memset(ldt_table, 0, TARGET_LDT_ENTRIES * TARGET_LDT_ENTRY_SIZE);
        env->ldt.base = ldt_table;
        env->ldt.limit = 0xffff;
    }

    /* NOTE: same code as Linux kernel */
    /* Allow LDTs to be cleared by the user. */
    if (ldt_info.base_addr == 0 && ldt_info.limit == 0) {
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