cosmopolitan/libc/stubs/stackchkguard.S

41 lines
2.3 KiB
ArmAsm

/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi
Copyright 2020 Justine Alexandra Roberts Tunney
Permission to use, copy, modify, and/or distribute this software for
any purpose with or without fee is hereby granted, provided that the
above copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
*/
#include "libc/macros.h"
#include "libc/notice.inc"
.source __FILE__
/ Canary for -fstack-protector.
/
/ This global is referenced by synthetic code generated by GCC.
/ The -mstack-protector-guard=global flag might need to be passed.
/
/ @note this value is protected by piro
.initbss 200,_init___stack_chk_guard
__stack_chk_guard:
.quad 0
.endobj __stack_chk_guard,globl
.previous
.init.start 301,_init___stack_chk_guard
rdtsc
stosl
xchg %edx,%eax
stosl
.init.end 301,_init___stack_chk_guard