syscall.c 66.5 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>
#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/user.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 "qemu.h"
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//#define DEBUG
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#ifndef PAGE_SIZE
#define PAGE_SIZE 4096
#define PAGE_MASK ~(PAGE_SIZE - 1)
#endif

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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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#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)

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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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
}

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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;
}

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:
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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;

            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;
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    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;
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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) {
        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 */
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int do_modify_ldt(CPUX86State *env, int func, void *ptr, unsigned long bytecount)
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{
    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;
}
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/* vm86 emulation */

#define SAFE_MASK  (0xDD5)

int do_vm86(CPUX86State *env, long subfunction, 
            struct target_vm86plus_struct * target_v86)
{
    TaskState *ts = env->opaque;
    int ret;
    
    switch (subfunction) {
    case TARGET_VM86_REQUEST_IRQ:
    case TARGET_VM86_FREE_IRQ:
    case TARGET_VM86_GET_IRQ_BITS:
    case TARGET_VM86_GET_AND_RESET_IRQ:
        gemu_log("qemu: unsupported vm86 subfunction (%ld)\n", subfunction);
        ret = -EINVAL;
        goto out;
    case TARGET_VM86_PLUS_INSTALL_CHECK:
        /* NOTE: on old vm86 stuff this will return the error
           from verify_area(), because the subfunction is
           interpreted as (invalid) address to vm86_struct.
           So the installation check works.
            */
        ret = 0;
        goto out;
    }

    ts->target_v86 = target_v86;

    /* save current CPU regs */
    ts->vm86_saved_regs.eax = 0; /* default vm86 syscall return code */
    ts->vm86_saved_regs.ebx = env->regs[R_EBX];
    ts->vm86_saved_regs.ecx = env->regs[R_ECX];
    ts->vm86_saved_regs.edx = env->regs[R_EDX];
    ts->vm86_saved_regs.esi = env->regs[R_ESI];
    ts->vm86_saved_regs.edi = env->regs[R_EDI];
    ts->vm86_saved_regs.ebp = env->regs[R_EBP];
    ts->vm86_saved_regs.esp = env->regs[R_ESP];
    ts->vm86_saved_regs.eflags = env->eflags;
    ts->vm86_saved_regs.eip  = env->eip;
    ts->vm86_saved_regs.cs = env->segs[R_CS];
    ts->vm86_saved_regs.ss = env->segs[R_SS];
    ts->vm86_saved_regs.ds = env->segs[R_DS];
    ts->vm86_saved_regs.es = env->segs[R_ES];
    ts->vm86_saved_regs.fs = env->segs[R_FS];
    ts->vm86_saved_regs.gs = env->segs[R_GS];

    /* build vm86 CPU state */
    env->eflags = (env->eflags & ~SAFE_MASK) | 
        (tswap32(target_v86->regs.eflags) & SAFE_MASK) | VM_MASK;

    env->regs[R_EBX] = tswap32(target_v86->regs.ebx);
    env->regs[R_ECX] = tswap32(target_v86->regs.ecx);
    env->regs[R_EDX] = tswap32(target_v86->regs.edx);
    env->regs[R_ESI] = tswap32(target_v86->regs.esi);
    env->regs[R_EDI] = tswap32(target_v86->regs.edi);
    env->regs[R_EBP] = tswap32(target_v86->regs.ebp);
    env->regs[R_ESP] = tswap32(target_v86->regs.esp);
    env->eip = tswap32(target_v86->regs.eip);
    cpu_x86_load_seg(env, R_CS, tswap16(target_v86->regs.cs));
    cpu_x86_load_seg(env, R_SS, tswap16(target_v86->regs.ss));
    cpu_x86_load_seg(env, R_DS, tswap16(target_v86->regs.ds));
    cpu_x86_load_seg(env, R_ES, tswap16(target_v86->regs.es));
    cpu_x86_load_seg(env, R_FS, tswap16(target_v86->regs.fs));
    cpu_x86_load_seg(env, R_GS, tswap16(target_v86->regs.gs));
    ret = tswap32(target_v86->regs.eax); /* eax will be restored at
                                            the end of the syscall */
    /* now the virtual CPU is ready for vm86 execution ! */
 out:
    return ret;
}

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/* 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;
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    TaskState *ts;
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    uint8_t *new_stack;
    CPUX86State *new_env;
    
    if (flags & CLONE_VM) {
        if (!newsp)
            newsp = env->regs[R_ESP];
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        ts = malloc(sizeof(TaskState) + NEW_STACK_SIZE);
        memset(ts, 0, sizeof(TaskState));
        new_stack = ts->stack;
        ts->used = 1;
        /* add in task state list */
        ts->next = first_task_state;
        first_task_state = ts;
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        /* 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;
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        new_env->opaque = ts;
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        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;
}

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#endif

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#define high2lowuid(x) (x)
#define high2lowgid(x) (x)
#define low2highuid(x) (x)
#define low2highgid(x) (x)
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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
}
                                 
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long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3, 
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                long arg4, long arg5, long arg6)
{
    long ret;
    struct stat st;
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    struct kernel_statfs *stfs;
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#ifdef DEBUG
    gemu_log("syscall %d\n", num);
#endif
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    switch(num) {
    case TARGET_NR_exit:
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#ifdef HAVE_GPROF
        _mcleanup();
#endif
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        /* XXX: should free thread stack and CPU env */
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        _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:
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        ret = get_errno(do_fork(cpu_env, SIGCHLD, 0));
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        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;
    case TARGET_NR_time:
        {
            int *time_ptr = (int *)arg1;
            ret = get_errno(time((time_t *)time_ptr));
            if (!is_error(ret) && time_ptr)
                tswap32s(time_ptr);
        }
        break;
    case TARGET_NR_mknod:
        ret = get_errno(mknod((const char *)arg1, arg2, arg3));
        break;
    case TARGET_NR_chmod:
        ret = get_errno(chmod((const char *)arg1, arg2));
        break;
    case TARGET_NR_lchown:
        ret = get_errno(chown((const char *)arg1, arg2, arg3));
        break;
    case TARGET_NR_break:
        goto unimplemented;
    case TARGET_NR_oldstat:
        goto unimplemented;
    case TARGET_NR_lseek:
        ret = get_errno(lseek(arg1, arg2, arg3));
        break;
    case TARGET_NR_getpid:
        ret = get_errno(getpid());
        break;
    case TARGET_NR_mount:
        /* need to look at the data field */
        goto unimplemented;
    case TARGET_NR_umount:
        ret = get_errno(umount((const char *)arg1));
        break;
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