qemu/bsd-user/syscall.c

/*
 *  BSD syscalls
 *
 *  Copyright (c) 2003 - 2008 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., 51 Franklin Street - Fifth Floor, Boston,
 *  MA 02110-1301, USA.
 */
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/syscall.h>
#include <signal.h>
#include <utime.h>

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

//#define DEBUG

static abi_ulong target_brk;
static abi_ulong target_original_brk;

#define get_errno(x) (x)
#define target_to_host_bitmask(x, tbl) (x)

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

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

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

    switch(num) {
    case TARGET_FREEBSD_NR_exit:
#ifdef HAVE_GPROF
        _mcleanup();
#endif
        gdb_exit(cpu_env, arg1);
        /* XXX: should free thread stack and CPU env */
        _exit(arg1);
        ret = 0; /* avoid warning */
        break;
    case TARGET_FREEBSD_NR_read:
        if (!(p = lock_user(VERIFY_WRITE, arg2, arg3, 0)))
            goto efault;
        ret = get_errno(read(arg1, p, arg3));
        unlock_user(p, arg2, ret);
        break;
    case TARGET_FREEBSD_NR_write:
        if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
            goto efault;
        ret = get_errno(write(arg1, p, arg3));
        unlock_user(p, arg2, 0);
        break;
    case TARGET_FREEBSD_NR_open:
        if (!(p = lock_user_string(arg1)))
            goto efault;
        ret = get_errno(open(path(p),
                             target_to_host_bitmask(arg2, fcntl_flags_tbl),
                             arg3));
        unlock_user(p, arg1, 0);
        break;
    case TARGET_FREEBSD_NR_mmap:
        ret = get_errno(target_mmap(arg1, arg2, arg3,
                                    target_to_host_bitmask(arg4, mmap_flags_tbl),
                                    arg5,
                                    arg6));
        break;
    case TARGET_FREEBSD_NR_mprotect:
        ret = get_errno(target_mprotect(arg1, arg2, arg3));
        break;
    case TARGET_FREEBSD_NR_syscall:
    case TARGET_FREEBSD_NR___syscall:
        ret = do_freebsd_syscall(cpu_env,arg1 & 0xffff,arg2,arg3,arg4,arg5,arg6,0);
        break;
    default:
        ret = syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
        break;
    }
 fail:
#ifdef DEBUG
    gemu_log(" = %ld\n", ret);
#endif
    if (do_strace)
        print_freebsd_syscall_ret(num, ret);
    return ret;
 efault:
    ret = -TARGET_EFAULT;
    goto fail;
}

abi_long do_netbsd_syscall(void *cpu_env, int num, abi_long arg1,
                           abi_long arg2, abi_long arg3, abi_long arg4,
                           abi_long arg5, abi_long arg6)
{
    abi_long ret;
    void *p;

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

    switch(num) {
    case TARGET_NETBSD_NR_exit:
#ifdef HAVE_GPROF
        _mcleanup();
#endif
        gdb_exit(cpu_env, arg1);
        /* XXX: should free thread stack and CPU env */
        _exit(arg1);
        ret = 0; /* avoid warning */
        break;
    case TARGET_NETBSD_NR_read:
        if (!(p = lock_user(VERIFY_WRITE, arg2, arg3, 0)))
            goto efault;
        ret = get_errno(read(arg1, p, arg3));
        unlock_user(p, arg2, ret);
        break;
    case TARGET_NETBSD_NR_write:
        if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
            goto efault;
        ret = get_errno(write(arg1, p, arg3));
        unlock_user(p, arg2, 0);
        break;
    case TARGET_NETBSD_NR_open:
        if (!(p = lock_user_string(arg1)))
            goto efault;
        ret = get_errno(open(path(p),
                             target_to_host_bitmask(arg2, fcntl_flags_tbl),
                             arg3));
        unlock_user(p, arg1, 0);
        break;
    case TARGET_NETBSD_NR_mmap:
        ret = get_errno(target_mmap(arg1, arg2, arg3,
                                    target_to_host_bitmask(arg4, mmap_flags_tbl),
                                    arg5,
                                    arg6));
        break;
    case TARGET_NETBSD_NR_mprotect:
        ret = get_errno(target_mprotect(arg1, arg2, arg3));
        break;
    case TARGET_NETBSD_NR_syscall:
    case TARGET_NETBSD_NR___syscall:
        ret = do_netbsd_syscall(cpu_env,arg1 & 0xffff,arg2,arg3,arg4,arg5,arg6,0);
        break;
    default:
        ret = syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
        break;
    }
 fail:
#ifdef DEBUG
    gemu_log(" = %ld\n", ret);
#endif
    if (do_strace)
        print_netbsd_syscall_ret(num, ret);
    return ret;
 efault:
    ret = -TARGET_EFAULT;
    goto fail;
}

abi_long do_openbsd_syscall(void *cpu_env, int num, abi_long arg1,
                            abi_long arg2, abi_long arg3, abi_long arg4,
                            abi_long arg5, abi_long arg6)
{
    abi_long ret;
    void *p;

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

    switch(num) {
    case TARGET_OPENBSD_NR_exit:
#ifdef HAVE_GPROF
        _mcleanup();
#endif
        gdb_exit(cpu_env, arg1);
        /* XXX: should free thread stack and CPU env */
        _exit(arg1);
        ret = 0; /* avoid warning */
        break;
    case TARGET_OPENBSD_NR_read:
        if (!(p = lock_user(VERIFY_WRITE, arg2, arg3, 0)))
            goto efault;
        ret = get_errno(read(arg1, p, arg3));
        unlock_user(p, arg2, ret);
        break;
    case TARGET_OPENBSD_NR_write:
        if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
            goto efault;
        ret = get_errno(write(arg1, p, arg3));
        unlock_user(p, arg2, 0);
        break;
    case TARGET_OPENBSD_NR_open:
        if (!(p = lock_user_string(arg1)))
            goto efault;
        ret = get_errno(open(path(p),
                             target_to_host_bitmask(arg2, fcntl_flags_tbl),
                             arg3));
        unlock_user(p, arg1, 0);
        break;
    case TARGET_OPENBSD_NR_mmap:
        ret = get_errno(target_mmap(arg1, arg2, arg3,
                                    target_to_host_bitmask(arg4, mmap_flags_tbl),
                                    arg5,
                                    arg6));
        break;
    case TARGET_OPENBSD_NR_mprotect:
        ret = get_errno(target_mprotect(arg1, arg2, arg3));
        break;
    case TARGET_OPENBSD_NR_syscall:
    case TARGET_OPENBSD_NR___syscall:
        ret = do_openbsd_syscall(cpu_env,arg1 & 0xffff,arg2,arg3,arg4,arg5,arg6,0);
        break;
    default:
        ret = syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
        break;
    }
 fail:
#ifdef DEBUG
    gemu_log(" = %ld\n", ret);
#endif
    if (do_strace)
        print_openbsd_syscall_ret(num, ret);
    return ret;
 efault:
    ret = -TARGET_EFAULT;
    goto fail;
}

void syscall_init(void)
{
}