31 lines
877 B
ArmAsm
31 lines
877 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 __swapcontext;
|
||
|
|
__swapcontext:
|
||
|
|
/* copy all of the current registers into the ucontext structure */
|
||
|
|
add r2, r0, #32
|
||
|
|
stmia r2, {r0-r12}
|
||
|
|
str r13, [r0,#84]
|
||
|
|
str r14, [r0,#92]
|
||
|
|
|
||
|
|
/* load new registers from the second ucontext structure */
|
||
|
|
add r14, r1, #32
|
||
|
|
ldmia r14, {r0-r12}
|
||
|
|
ldr r13, [r14, #52]
|
||
|
|
add r14, r14, #56
|
||
|
|
ldmia r14, {r14, pc}
|
||
|
|
|
||
|
|
|
||
|
|
.weak swapcontext;
|
||
|
|
swapcontext = __swapcontext;
|