forked from ariadne/libucontext
83 lines
2.0 KiB
ArmAsm
83 lines
2.0 KiB
ArmAsm
/*
|
|
* Copyright (c) 2020 Ariadne Conill <ariadne@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.
|
|
*/
|
|
|
|
LOCALSZ = 2
|
|
|
|
#include "defs.h"
|
|
|
|
A1_OFFSET = FRAMESZ - (1 * REG_SZ)
|
|
|
|
ALIAS(swapcontext, libucontext_swapcontext)
|
|
ALIAS(__swapcontext, libucontext_swapcontext)
|
|
|
|
FUNC(libucontext_swapcontext)
|
|
/* copy $gp, $sp, $fp to temporary registers so we don't clobber them */
|
|
move $a2, $gp
|
|
move $a3, $sp
|
|
|
|
PUSH_FRAME(libucontext_swapcontext)
|
|
|
|
/* set registers */
|
|
sd $s0, REG_OFFSET(16)($a0)
|
|
sd $s1, REG_OFFSET(17)($a0)
|
|
sd $s2, REG_OFFSET(18)($a0)
|
|
sd $s3, REG_OFFSET(19)($a0)
|
|
sd $s4, REG_OFFSET(20)($a0)
|
|
sd $s5, REG_OFFSET(21)($a0)
|
|
sd $s6, REG_OFFSET(22)($a0)
|
|
sd $s7, REG_OFFSET(23)($a0)
|
|
|
|
sd $a2, REG_OFFSET(28)($a0)
|
|
sd $a3, REG_OFFSET(29)($a0)
|
|
sd $fp, REG_OFFSET(30)($a0)
|
|
sd $ra, REG_OFFSET(31)($a0)
|
|
sd $ra, (MCONTEXT_PC)($a0)
|
|
|
|
/* copy new context address in $a1 to stack */
|
|
sd $a1, A1_OFFSET($sp)
|
|
|
|
/* load new context address into $v0 */
|
|
ld $v0, A1_OFFSET($sp)
|
|
|
|
/* load the registers */
|
|
ld $a0, REG_OFFSET(4)($v0)
|
|
ld $a1, REG_OFFSET(5)($v0)
|
|
ld $a2, REG_OFFSET(6)($v0)
|
|
ld $a3, REG_OFFSET(7)($v0)
|
|
|
|
ld $s0, REG_OFFSET(16)($v0)
|
|
ld $s1, REG_OFFSET(17)($v0)
|
|
ld $s2, REG_OFFSET(18)($v0)
|
|
ld $s3, REG_OFFSET(19)($v0)
|
|
ld $s4, REG_OFFSET(20)($v0)
|
|
ld $s5, REG_OFFSET(21)($v0)
|
|
ld $s6, REG_OFFSET(22)($v0)
|
|
ld $s7, REG_OFFSET(23)($v0)
|
|
|
|
ld $gp, REG_OFFSET(28)($v0)
|
|
ld $sp, REG_OFFSET(29)($v0)
|
|
ld $fp, REG_OFFSET(30)($v0)
|
|
ld $ra, REG_OFFSET(31)($v0)
|
|
ld $t9, (MCONTEXT_PC)($v0)
|
|
|
|
move $v0, $zero
|
|
jr $t9
|
|
|
|
fail:
|
|
la $t9, exit
|
|
|
|
POP_FRAME(libucontext_swapcontext)
|
|
|
|
move $v0, $zero
|
|
jalr $t9
|
|
END(libucontext_swapcontext)
|