libucontext/arch/arm/swapcontext.S

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;