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_i386_syscall.S
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_i386_syscall.S
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/* File: _i386_syscall.S
Time-stamp: <2010-11-22 20:16:52 gawen>
Copyright (C) 2010 David Hauweele <david.hauweele@gmail.com>
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 3 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, see <http://www.gnu.org/licenses/>.
*/
/* From uClib : syscall.S
use : syscall(__NR_exit, 42);
*/
.text
.global syscall
.type syscall, %function
syscall:
pushl %ebp
pushl %edi
pushl %esi
pushl %ebx
movl 44(%esp), %ebp /* load argument registers */
movl 40(%esp), %edi
movl 36(%esp), %esi
movl 32(%esp), %edx
movl 28(%esp), %ecx
movl 24(%esp), %ebx
movl 20(%esp), %eax /* syscall number */
int $0x80
popl %ebx
popl %esi
popl %edi
popl %ebp
cmpl $-4095, %eax
jae _syscall_error
ret /* return to caller */
.size syscall,.-syscall