libc
/* $Id$ */
/* Copyright (c) 2009-2020 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. */
_syscall:
/* svc 0x00000000 */
mov %r7, %ip
cmp %r0, #0
bge .errnoret
mov %r1, #0
sub %r0, %r1, %r0
ldr %r1, =errno
str %r0, [%r1]
mov %r0, #-1
.errnoret:
mov %pc, %lr
/* macros */
#define SYSCALL(name) \
.global name; \
.type _start, %function; \
name:; \
mov %ip, %r7; \
ldr %r7, =SYS_ ## name; \
b _syscall;
/* functions */
/* _brk */
.global _brk
_brk:
mov %ip, %r7
ldr %r7, =SYS_brk
b _syscall
#undef SYS_brk
/* _exit */
.global _exit
_exit:
mov %ip, %r7
ldr %r7, =SYS_exit
b _syscall