libc
/* $Id$ */
/* Copyright (c) 2007-2016 Pierre Pronchery <khorben@defora.org> */
/* This file is part of DeforaOS System libc */
/* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
/* FIXME:
* - some syscalls may return an additional value into %edx (eg lseek) */
_syscall:
int $0x80
jnc .errnoret
.errno:
mov %eax, errno
mov $-1, %eax
.errnoret:
ret
/* macros */
#ifndef SYSCALL
# define SYSCALL(name) \
.global name; \
name:; \
mov $SYS_ ## name, %eax; \
jmp _syscall
#endif
/* functions */
/* _brk */
.global _brk
_brk:
mov $SYS_brk, %eax
int $0x80
jc .errno
ret
#undef SYS_brk
/* _exit */
.global _exit
_exit:
mov $SYS_exit, %eax
jmp _syscall
/* execve */
.global execve
execve:
mov $SYS_execve, %eax
int $0x80
mov %eax, errno
mov $-1, %eax
ret
#undef SYS_execve