bsd-user/freebsd/os-syscall.c

   1 /*
   2  *  BSD syscalls
   3  *
   4  *  Copyright (c) 2003-2008 Fabrice Bellard
   5  *  Copyright (c) 2013-2014 Stacey D. Son
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 /*
  22  * We need the FreeBSD "legacy" definitions. Rust needs the FreeBSD 11 system
  23  * calls since it doesn't use libc at all, so we have to emulate that despite
  24  * FreeBSD 11 being EOL'd.
  25  */
  26 #define _WANT_FREEBSD11_STAT
  27 #define _WANT_FREEBSD11_STATFS
  28 #define _WANT_FREEBSD11_DIRENT
  29 #define _WANT_KERNEL_ERRNO
  30 #define _WANT_SEMUN
  31 #include "qemu/osdep.h"
  32 #include "qemu/cutils.h"
  33 #include "qemu/path.h"
  34 #include <sys/syscall.h>
  35 #include <sys/param.h>
  36 #include <sys/sysctl.h>
  37 #include <utime.h>
  38
  39 #include "qemu.h"
  40 #include "signal-common.h"
  41 #include "user/syscall-trace.h"
  42
  43 #include "bsd-file.h"
  44
  45 void target_set_brk(abi_ulong new_brk)
  46 {
  47 }
  48
  49 /*
  50  * errno conversion.
  51  */
  52 abi_long get_errno(abi_long ret)
  53 {
  54     if (ret == -1) {
  55         return -host_to_target_errno(errno);
  56     } else {
  57         return ret;
  58     }
  59 }
  60
  61 int host_to_target_errno(int err)
  62 {
  63     /*
  64      * All the BSDs have the property that the error numbers are uniform across
  65      * all architectures for a given BSD, though they may vary between different
  66      * BSDs.
  67      */
  68     return err;
  69 }
  70
  71 bool is_error(abi_long ret)
  72 {
  73     return (abi_ulong)ret >= (abi_ulong)(-4096);
  74 }
  75
  76 /*
  77  * do_syscall() should always have a single exit point at the end so that
  78  * actions, such as logging of syscall results, can be performed.  All errnos
  79  * that do_syscall() returns must be -TARGET_<errcode>.
  80  */
  81 abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1,
  82                             abi_long arg2, abi_long arg3, abi_long arg4,
  83                             abi_long arg5, abi_long arg6, abi_long arg7,
  84                             abi_long arg8)
  85 {
  86     return 0;
  87 }
  88
  89 void syscall_init(void)
  90 {
  91 }