Archipelago » qemu

/*

 *  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>

#include <string.h>

#include <elf.h>

#include <endian.h>

#include <errno.h>

#include <unistd.h>

#include <fcntl.h>

#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>

#include <sys/poll.h>

//#include <sys/user.h>

#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/dirent.h>

#include "qemu.h"

//#define DEBUG

#ifndef PAGE_SIZE

#define PAGE_SIZE 4096

#define PAGE_MASK ~(PAGE_SIZE - 1)

#endif

//#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])

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);

long do_sigreturn(CPUX86State *env);

long do_rt_sigreturn(CPUX86State *env);

#define __NR_sys_uname __NR_uname

#define __NR_sys_getcwd1 __NR_getcwd

#define __NR_sys_statfs __NR_statfs

#define __NR_sys_fstatfs __NR_fstatfs

#define __NR_sys_getdents __NR_getdents

#define __NR_sys_getdents64 __NR_getdents64

#define __NR_sys_rt_sigqueueinfo __NR_rt_sigqueueinfo

#ifdef __NR_gettid

_syscall0(int, gettid)

#else

static int gettid(void) {

    return -ENOSYS;

}

#endif

_syscall1(int,sys_uname,struct new_utsname *,buf)

_syscall2(int,sys_getcwd1,char *,buf,size_t,size)

_syscall3(int, sys_getdents, uint, fd, struct dirent *, dirp, uint, count);

_syscall3(int, sys_getdents64, uint, fd, struct dirent64 *, dirp, uint, count);

_syscall5(int, _llseek,  uint,  fd, ulong, hi, ulong, lo,

          loff_t *, res, uint, wh);

_syscall2(int,sys_statfs,const char *,path,struct kernel_statfs *,buf)

_syscall2(int,sys_fstatfs,int,fd,struct kernel_statfs *,buf)

_syscall3(int,sys_rt_sigqueueinfo,int,pid,int,sig,siginfo_t *,uinfo)

extern int personality(int);

extern int flock(int, int);

extern int setfsuid(int);

extern int setfsgid(int);

extern int setresuid(int,int,int);

extern int getresuid(int *,int *,int *);

extern int setresgid(int,int,int);

extern int getresgid(int *,int *,int *);

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;

    brk_page = (char *)(((unsigned long)target_brk + PAGE_SIZE - 1) & PAGE_MASK);

    /* 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... */

    new_alloc_size = ((new_brk - brk_page + 1)+(PAGE_SIZE-1)) & PAGE_MASK;

    mapped_addr = get_errno((long)mmap((caddr_t)brk_page, new_alloc_size, 

                                       PROT_READ|PROT_WRITE,

                                       MAP_ANON|MAP_FIXED|MAP_PRIVATE, 0, 0));

    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)

{

#if !defined(BSWP_NEEDED) && !defined(WORD_BIGENDIAN)

    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)

{

#if !defined(BSWP_NEEDED) && !defined(WORD_BIGENDIAN)

    /* 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

}

static inline void target_to_host_timeval(struct timeval *tv, 

                                          struct target_timeval *target_tv)

{

    tv->tv_sec = tswapl(target_tv->tv_sec);

    tv->tv_usec = tswapl(target_tv->tv_usec);

}

static inline void host_to_target_timeval(struct target_timeval *target_tv, 

                                          struct timeval *tv)

{

    target_tv->tv_sec = tswapl(tv->tv_sec);

    target_tv->tv_usec = tswapl(tv->tv_usec);

}

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) {

        tv.tv_sec = tswapl(target_tv->tv_sec);

        tv.tv_usec = tswapl(target_tv->tv_usec);

        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) {

            target_tv->tv_sec = tswapl(tv.tv_sec);

            target_tv->tv_usec = tswapl(tv.tv_usec);

        }

    }

    return ret;

}

static long do_socketcall(int num, long *vptr)

{

    long ret;

    switch(num) {

    case SOCKOP_socket:

        ret = get_errno(socket(vptr[0], vptr[1], vptr[2]));

        break;

    case SOCKOP_bind:

        ret = get_errno(bind(vptr[0], (struct sockaddr *)vptr[1], vptr[2]));

        break;

    case SOCKOP_connect:

        ret = get_errno(connect(vptr[0], (struct sockaddr *)vptr[1], vptr[2]));

        break;

    case SOCKOP_listen:

        ret = get_errno(listen(vptr[0], vptr[1]));

        break;

    case SOCKOP_accept:

        {

            socklen_t size;

            size = tswap32(*(int32_t *)vptr[2]);

            ret = get_errno(accept(vptr[0], (struct sockaddr *)vptr[1], &size));

            if (!is_error(ret)) 

                *(int32_t *)vptr[2] = size;

        }

        break;

    case SOCKOP_getsockname:

        {

            socklen_t size;

            size = tswap32(*(int32_t *)vptr[2]);

            ret = get_errno(getsockname(vptr[0], (struct sockaddr *)vptr[1], &size));

            if (!is_error(ret)) 

                *(int32_t *)vptr[2] = size;

        }

        break;

    case SOCKOP_getpeername:

        {

            socklen_t size;

            size = tswap32(*(int32_t *)vptr[2]);

            ret = get_errno(getpeername(vptr[0], (struct sockaddr *)vptr[1], &size));

            if (!is_error(ret)) 

                *(int32_t *)vptr[2] = size;

        }

        break;

    case SOCKOP_socketpair:

        {

            int tab[2];

            int32_t *target_tab = (int32_t *)vptr[3];

            ret = get_errno(socketpair(vptr[0], vptr[1], vptr[2], tab));

            if (!is_error(ret)) {

                target_tab[0] = tswap32(tab[0]);

                target_tab[1] = tswap32(tab[1]);

            }

        }

        break;

    case SOCKOP_send:

        ret = get_errno(send(vptr[0], (void *)vptr[1], vptr[2], vptr[3]));

        break;

    case SOCKOP_recv:

        ret = get_errno(recv(vptr[0], (void *)vptr[1], vptr[2], vptr[3]));

        break;

    case SOCKOP_sendto:

        ret = get_errno(sendto(vptr[0], (void *)vptr[1], vptr[2], vptr[3], 

                               (struct sockaddr *)vptr[4], vptr[5]));

        break;

    case SOCKOP_recvfrom:

        {

            socklen_t size;

            size = tswap32(*(int32_t *)vptr[5]);

            ret = get_errno(recvfrom(vptr[0], (void *)vptr[1], vptr[2], 

                                     vptr[3], (struct sockaddr *)vptr[4], &size));

            if (!is_error(ret)) 

                *(int32_t *)vptr[5] = size;

        }

        break;

    case SOCKOP_shutdown:

        ret = get_errno(shutdown(vptr[0], vptr[1]));

        break;

    case SOCKOP_sendmsg:

    case SOCKOP_recvmsg:

        {

            int fd;

            struct target_msghdr *msgp;

            struct msghdr msg;

            int flags, count, i;

            struct iovec *vec;

            struct target_iovec *target_vec;

            msgp = (void *)vptr[1];

            msg.msg_name = (void *)tswapl(msgp->msg_name);

            msg.msg_namelen = tswapl(msgp->msg_namelen);

            msg.msg_control = (void *)tswapl(msgp->msg_control);

            msg.msg_controllen = tswapl(msgp->msg_controllen);

            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;

            fd = vptr[0];

            flags = vptr[2];

            if (num == SOCKOP_sendmsg)

                ret = sendmsg(fd, &msg, flags);

            else

                ret = recvmsg(fd, &msg, flags);

            ret = get_errno(ret);

        }

        break;

    case SOCKOP_setsockopt:

    case SOCKOP_getsockopt:

    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;

    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

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;

#if defined(DEBUG)

    gemu_log("ioctl: cmd=0x%04lx (%s)\n", 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++;

        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) },

};

#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) {

        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) |

        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 */

int gemu_modify_ldt(CPUX86State *env, int func, void *ptr, unsigned long bytecount)

{

    int ret = -ENOSYS;

    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;

    }

    return ret;

}

/* 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)

{

    CPUX86State *env = arg;

    cpu_loop(env);

    /* never exits */

    return 0;

}

int do_fork(CPUX86State *env, unsigned int flags, unsigned long newsp)

{

    int ret;

    uint8_t *new_stack;

    CPUX86State *new_env;

    if (flags & CLONE_VM) {

        if (!newsp)

            newsp = env->regs[R_ESP];

        new_stack = malloc(NEW_STACK_SIZE);

        /* we create a new CPU instance. */

        new_env = cpu_x86_init();

        memcpy(new_env, env, sizeof(CPUX86State));

        new_env->regs[R_ESP] = newsp;

        new_env->regs[R_EAX] = 0;

        ret = clone(clone_func, new_stack + NEW_STACK_SIZE, flags, new_env);

    } else {

        /* if no CLONE_VM, we consider it is a fork */

        if ((flags & ~CSIGNAL) != 0)

            return -EINVAL;

        ret = fork();

    }

    return ret;

}

#endif

#define high2lowuid(x) (x)

#define high2lowgid(x) (x)

#define low2highuid(x) (x)

#define low2highgid(x) (x)

void syscall_init(void)

{

#define STRUCT(name, list...) 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

}

long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3, 

                long arg4, long arg5, long arg6)

{

    long ret;

    struct stat st;

    struct kernel_statfs *stfs;

#ifdef DEBUG

    gemu_log("syscall %d\n", num);

#endif

    switch(num) {

    case TARGET_NR_exit:

#ifdef HAVE_GPROF

        _mcleanup();

#endif

        /* XXX: should free thread stack and CPU env */

        _exit(arg1);

        ret = 0; /* avoid warning */

        break;

    case TARGET_NR_read:

        ret = get_errno(read(arg1, (void *)arg2, arg3));

        break;

    case TARGET_NR_write:

        ret = get_errno(write(arg1, (void *)arg2, arg3));

        break;

    case TARGET_NR_open:

        ret = get_errno(open((const char *)arg1, arg2, arg3));

        break;

    case TARGET_NR_close:

        ret = get_errno(close(arg1));

        break;

    case TARGET_NR_brk:

        ret = do_brk((char *)arg1);

        break;

    case TARGET_NR_fork:

        ret = get_errno(do_fork(cpu_env, SIGCHLD, 0));

        break;

    case TARGET_NR_waitpid:

        {

            int *status = (int *)arg2;

            ret = get_errno(waitpid(arg1, status, arg3));

            if (!is_error(ret) && status)

                tswapls((long *)&status);

        }

        break;

    case TARGET_NR_creat:

        ret = get_errno(creat((const char *)arg1, arg2));

        break;

    case TARGET_NR_link:

        ret = get_errno(link((const char *)arg1, (const char *)arg2));

        break;

    case TARGET_NR_unlink:

        ret = get_errno(unlink((const char *)arg1));

        break;

    case TARGET_NR_execve:

        ret = get_errno(execve((const char *)arg1, (void *)arg2, (void *)arg3));

        break;

    case TARGET_NR_chdir:

        ret = get_errno(chdir((const char *)arg1));

        break;