forked from ariadne/libucontext
32 lines
983 B
ArmAsm
32 lines
983 B
ArmAsm
/*
|
|
* Copyright (c) 2018 William Pitcock <nenolod@dereferenced.org>
|
|
*
|
|
* 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.
|
|
*
|
|
* This software is provided 'as is' and without any warranty, express or
|
|
* implied. In no event shall the authors be liable for any damages arising
|
|
* from the use of this software.
|
|
*/
|
|
|
|
.globl __start_context;
|
|
.hidden __start_context;
|
|
__start_context:
|
|
cmpdi 31,0 /* test if ucontext link pointer is null */
|
|
beq no_linked_context /* if it is, exit */
|
|
|
|
/* now, call SYS_swapcontext */
|
|
mr 4,31 /* ucp is in r31 */
|
|
li 3,0 /* don't care about restoring, set oucp to NULL */
|
|
li 5,1696 /* sizeof(ucontext_t) */
|
|
li 0,249 /* SYS_swapcontext */
|
|
sc
|
|
|
|
/* we should not wind back up here, if we do, exit with -1 */
|
|
li 3,-1
|
|
|
|
no_linked_context:
|
|
b exit@GOT
|
|
nop
|