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 <time.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/times.h>

#include <sys/shm.h>

#include <utime.h>

#include <sys/sysinfo.h>

//#include <sys/user.h>

#include <netinet/ip.h>

#include <netinet/tcp.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 <linux/kd.h>

#include "qemu.h"

//#define DEBUG

#if defined(TARGET_I386) || defined(TARGET_ARM) || defined(TARGET_SPARC)

/* 16 bit uid wrappers emulation */

#define USE_UID16

#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])

#if defined(__powerpc__)

#undef __syscall_nr

#undef __sc_loadargs_0

#undef __sc_loadargs_1

#undef __sc_loadargs_2

#undef __sc_loadargs_3

#undef __sc_loadargs_4

#undef __sc_loadargs_5

#undef __sc_asm_input_0

#undef __sc_asm_input_1

#undef __sc_asm_input_2

#undef __sc_asm_input_3

#undef __sc_asm_input_4

#undef __sc_asm_input_5

#undef _syscall0

#undef _syscall1

#undef _syscall2

#undef _syscall3

#undef _syscall4

#undef _syscall5

/* need to redefine syscalls as Linux kernel defines are incorrect for

   the clobber list */

/* On powerpc a system call basically clobbers the same registers like a

 * function call, with the exception of LR (which is needed for the

 * "sc; bnslr" sequence) and CR (where only CR0.SO is clobbered to signal

 * an error return status).

 */

#define __syscall_nr(nr, type, name, args...)                                \

        unsigned long __sc_ret, __sc_err;                                \

        {                                                                \

                register unsigned long __sc_0  __asm__ ("r0");                \

                register unsigned long __sc_3  __asm__ ("r3");                \

                register unsigned long __sc_4  __asm__ ("r4");                \

                register unsigned long __sc_5  __asm__ ("r5");                \

                register unsigned long __sc_6  __asm__ ("r6");                \

                register unsigned long __sc_7  __asm__ ("r7");                \

                                                                        \

                __sc_loadargs_##nr(name, args);                                \

                __asm__ __volatile__                                        \

                        ("sc           \n\t"                                \

                         "mfcr %0      "                                \

                        : "=&r" (__sc_0),                                \

                          "=&r" (__sc_3),  "=&r" (__sc_4),                \

                          "=&r" (__sc_5),  "=&r" (__sc_6),                \

                          "=&r" (__sc_7)                                \

                        : __sc_asm_input_##nr                                \

                        : "cr0", "ctr", "memory",                        \

                          "r8", "r9", "r10","r11", "r12");                \

                __sc_ret = __sc_3;                                        \

                __sc_err = __sc_0;                                        \

        }                                                                \

        if (__sc_err & 0x10000000)                                        \

        {                                                                \

                errno = __sc_ret;                                        \

                __sc_ret = -1;                                                \

        }                                                                \

        return (type) __sc_ret

#define __sc_loadargs_0(name, dummy...)                                        \

        __sc_0 = __NR_##name

#define __sc_loadargs_1(name, arg1)                                        \

        __sc_loadargs_0(name);                                                \

        __sc_3 = (unsigned long) (arg1)

#define __sc_loadargs_2(name, arg1, arg2)                                \

        __sc_loadargs_1(name, arg1);                                        \

        __sc_4 = (unsigned long) (arg2)

#define __sc_loadargs_3(name, arg1, arg2, arg3)                                \

        __sc_loadargs_2(name, arg1, arg2);                                \

        __sc_5 = (unsigned long) (arg3)

#define __sc_loadargs_4(name, arg1, arg2, arg3, arg4)                        \

        __sc_loadargs_3(name, arg1, arg2, arg3);                        \

        __sc_6 = (unsigned long) (arg4)

#define __sc_loadargs_5(name, arg1, arg2, arg3, arg4, arg5)                \

        __sc_loadargs_4(name, arg1, arg2, arg3, arg4);                        \

        __sc_7 = (unsigned long) (arg5)

#define __sc_asm_input_0 "0" (__sc_0)

#define __sc_asm_input_1 __sc_asm_input_0, "1" (__sc_3)

#define __sc_asm_input_2 __sc_asm_input_1, "2" (__sc_4)

#define __sc_asm_input_3 __sc_asm_input_2, "3" (__sc_5)

#define __sc_asm_input_4 __sc_asm_input_3, "4" (__sc_6)

#define __sc_asm_input_5 __sc_asm_input_4, "5" (__sc_7)

#define _syscall0(type,name)                                                \

type name(void)                                                                \

{                                                                        \

        __syscall_nr(0, type, name);                                        \

}

#define _syscall1(type,name,type1,arg1)                                        \

type name(type1 arg1)                                                        \

{                                                                        \

        __syscall_nr(1, type, name, arg1);                                \

}

#define _syscall2(type,name,type1,arg1,type2,arg2)                        \

type name(type1 arg1, type2 arg2)                                        \

{                                                                        \

        __syscall_nr(2, type, name, arg1, arg2);                        \

}

#define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3)                \

type name(type1 arg1, type2 arg2, type3 arg3)                                \

{                                                                        \

        __syscall_nr(3, type, name, arg1, arg2, arg3);                        \

}

#define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \

type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4)                \

{                                                                        \

        __syscall_nr(4, type, name, arg1, arg2, arg3, arg4);                \

}

#define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,type5,arg5) \

type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5)        \

{                                                                        \

        __syscall_nr(5, type, name, arg1, arg2, arg3, arg4, arg5);        \

}

#endif

#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

#if defined(__alpha__) || defined (__ia64__) || defined(__x86_64__)

#define __NR__llseek __NR_lseek

#endif

#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)

#ifdef __NR_exit_group

_syscall1(int,exit_group,int,error_code)

#endif

extern int personality(int);

extern int flock(int, int);

extern int setfsuid(int);

extern int setfsgid(int);

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 *);

extern int setgroups(int, gid_t *);

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 *)HOST_PAGE_ALIGN((unsigned long)target_brk);

    /* If the new brk is less than this, set it and we're done... */

    if (new_brk < brk_page) {

        target_brk = new_brk;

            return (long)target_brk;

    }

    /* We need to allocate more memory after the brk... */

    new_alloc_size = HOST_PAGE_ALIGN(new_brk - brk_page + 1);

    mapped_addr = get_errno(target_mmap((unsigned long)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(BSWAP_NEEDED) && !defined(WORDS_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(BSWAP_NEEDED) && !defined(WORDS_BIGENDIAN)

    /* nothing to do */

#else

    int i, nw, j, k;

    target_long v;

    if (target_fds) {

        nw = (n + TARGET_LONG_BITS - 1) / 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

}

#if defined(__alpha__)

#define HOST_HZ 1024

#else

#define HOST_HZ 100

#endif

static inline long host_to_target_clock_t(long ticks)

{

#if HOST_HZ == TARGET_HZ

    return ticks;

#else

    return ((int64_t)ticks * TARGET_HZ) / HOST_HZ;

#endif

}

static inline void host_to_target_rusage(struct target_rusage *target_rusage, 

                                         const struct rusage *rusage)

{

    target_rusage->ru_utime.tv_sec = tswapl(rusage->ru_utime.tv_sec);

    target_rusage->ru_utime.tv_usec = tswapl(rusage->ru_utime.tv_usec);

    target_rusage->ru_stime.tv_sec = tswapl(rusage->ru_stime.tv_sec);

    target_rusage->ru_stime.tv_usec = tswapl(rusage->ru_stime.tv_usec);

    target_rusage->ru_maxrss = tswapl(rusage->ru_maxrss);

    target_rusage->ru_ixrss = tswapl(rusage->ru_ixrss);

    target_rusage->ru_idrss = tswapl(rusage->ru_idrss);

    target_rusage->ru_isrss = tswapl(rusage->ru_isrss);

    target_rusage->ru_minflt = tswapl(rusage->ru_minflt);

    target_rusage->ru_majflt = tswapl(rusage->ru_majflt);

    target_rusage->ru_nswap = tswapl(rusage->ru_nswap);

    target_rusage->ru_inblock = tswapl(rusage->ru_inblock);

    target_rusage->ru_oublock = tswapl(rusage->ru_oublock);

    target_rusage->ru_msgsnd = tswapl(rusage->ru_msgsnd);

    target_rusage->ru_msgrcv = tswapl(rusage->ru_msgrcv);

    target_rusage->ru_nsignals = tswapl(rusage->ru_nsignals);

    target_rusage->ru_nvcsw = tswapl(rusage->ru_nvcsw);

    target_rusage->ru_nivcsw = tswapl(rusage->ru_nivcsw);

}

static inline void target_to_host_timeval(struct timeval *tv, 

                                          const 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, 

                                          const 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) {

        target_to_host_timeval(&tv, target_tv);

        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) {

            host_to_target_timeval(target_tv, &tv);

        }

    }

    return ret;

}

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)

{

    int val, ret;

    switch(level) {

    case SOL_TCP:

        /* TCP options all take an 'int' value.  */

        if (optlen < sizeof(uint32_t))

            return -EINVAL;

        if (get_user(val, (uint32_t *)optval))

            return -EFAULT;

        ret = get_errno(setsockopt(sockfd, level, optname, &val, sizeof(val)));

        break;

    case SOL_IP:

        switch(optname) {

        case IP_HDRINCL:

            val = 0;

            if (optlen >= sizeof(uint32_t)) {

                if (get_user(val, (uint32_t *)optval))

                    return -EFAULT;

            } else if (optlen >= 1) {

                if (get_user(val, (uint8_t *)optval))

                    return -EFAULT;

            }

            ret = get_errno(setsockopt(sockfd, level, optname, &val, sizeof(val)));

            break;

        default:

            goto unimplemented;

        }

        break;

    case SOL_SOCKET:

        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:

            if (optlen < sizeof(uint32_t))

                return -EINVAL;

            if (get_user(val, (uint32_t *)optval))

                return -EFAULT;

            ret = get_errno(setsockopt(sockfd, level, optname, &val, sizeof(val)));

            break;

        default:

            goto unimplemented;

        }

        break;

    default:

    unimplemented:

        gemu_log("Unsupported setsockopt level=%d optname=%d \n", level, optname);

        ret = -ENOSYS;

    }

    return ret;

}

static long do_getsockopt(int sockfd, int level, int optname, 

                          void *optval, socklen_t *optlen)

{

    int len, lv, val, ret;

    switch(level) {

    case SOL_SOCKET:

        switch (optname) {

        case SO_LINGER:

        case SO_RCVTIMEO:

        case SO_SNDTIMEO:

        case SO_PEERCRED:

        case SO_PEERNAME:

            /* These don't just return a single integer */

            goto unimplemented;

        default:

            if (get_user(len, optlen))

                return -EFAULT;

            if (len < 0)

                return -EINVAL;

            lv = sizeof(int);

            ret = get_errno(getsockopt(sockfd, level, optname, &val, &lv));

            if (ret < 0)

                return ret;

            val = tswap32(val);

            if (len > lv)

                len = lv;

            if (copy_to_user(optval, &val, len))

                return -EFAULT;

            if (put_user(len, optlen))

                return -EFAULT;

            break;

        }

        break;

    default:

    unimplemented:

        gemu_log("getsockopt level=%d optname=%d not yet supported\n",

                 level, optname);

        ret = -ENOSYS;

        break;

    }

    return ret;

}

static long do_socketcall(int num, int32_t *vptr)

{

    long ret;

    switch(num) {

    case SOCKOP_socket:

        {

            int domain = tswap32(vptr[0]);

            int type = tswap32(vptr[1]);

            int protocol = tswap32(vptr[2]);

            ret = get_errno(socket(domain, type, protocol));

        }

        break;

    case SOCKOP_bind:

        {

            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));

        }

        break;

    case SOCKOP_connect:

        {

            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));

        }

        break;

    case SOCKOP_listen:

        {

            int sockfd = tswap32(vptr[0]);

            int backlog = tswap32(vptr[1]);

            ret = get_errno(listen(sockfd, backlog));

        }

        break;

    case SOCKOP_accept:

        {

            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);

            }

        }

        break;

    case SOCKOP_getsockname:

        {

            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);

            }

        }

        break;

    case SOCKOP_getpeername:

        {

            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);

            }

        }

        break;

    case SOCKOP_socketpair:

        {

            int domain = tswap32(vptr[0]);

            int type = tswap32(vptr[1]);

            int protocol = tswap32(vptr[2]);

            int32_t *target_tab = (void *)tswap32(vptr[3]);

            int tab[2];

            ret = get_errno(socketpair(domain, type, protocol, tab));

            if (!is_error(ret)) {

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

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

            }

        }

        break;

    case SOCKOP_send:

        {

            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));

        }

        break;

    case SOCKOP_recv:

        {

            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));

        }

        break;

    case SOCKOP_sendto:

        {

            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));

        }

        break;

    case SOCKOP_recvfrom:

        {

            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);

            }

        }

        break;

    case SOCKOP_shutdown:

        {

            int sockfd = tswap32(vptr[0]);

            int how = tswap32(vptr[1]);

            ret = get_errno(shutdown(sockfd, how));

        }

        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 *)tswap32(vptr[1]);

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

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

            msg.msg_controllen = 2 * tswapl(msgp->msg_controllen);

            msg.msg_control = alloca(msg.msg_controllen);

            msg.msg_flags = tswap32(msgp->msg_flags);

            count = tswapl(msgp->msg_iovlen);

            vec = alloca(count * sizeof(struct iovec));

            target_vec = (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 = 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);

            }

        }

        break;

    case SOCKOP_setsockopt:

        {

            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;

    case SOCKOP_getsockopt:

        {

            int sockfd = tswap32(vptr[0]);

            int level = tswap32(vptr[1]);

            int optname = tswap32(vptr[2]);

            void *optval = (void *)tswap32(vptr[3]);

            uint32_t *poptlen = (void *)tswap32(vptr[4]);

            ret = do_getsockopt(sockfd, level, optname, optval, poptlen);

        }

        break;

    default:

        gemu_log("Unsupported socketcall: %d\n", num);

        ret = -ENOSYS;