87 lines
2.0 KiB
ArmAsm
87 lines
2.0 KiB
ArmAsm
/*
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* Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* This software is provided 'as is' and without any warranty, express or
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* implied. In no event shall the authors be liable for any damages arising
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* from the use of this software.
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*/
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LOCALSZ = 2
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#include "defs.h"
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A1_OFFSET = FRAMESZ - (1 * REG_SZ)
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ALIAS(swapcontext, __swapcontext)
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FUNC(__swapcontext)
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/* copy $gp, $sp, $fp to temporary registers so we don't clobber them */
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move $a2, $gp
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move $a3, $sp
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move $a4, $fp
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PUSH_FRAME(__swapcontext)
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/* set registers */
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sd $s0, REG_OFFSET(16)($a0)
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sd $s1, REG_OFFSET(17)($a0)
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sd $s2, REG_OFFSET(18)($a0)
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sd $s3, REG_OFFSET(19)($a0)
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sd $s4, REG_OFFSET(20)($a0)
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sd $s5, REG_OFFSET(21)($a0)
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sd $s6, REG_OFFSET(22)($a0)
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sd $s7, REG_OFFSET(23)($a0)
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sd $a2, REG_OFFSET(28)($a0)
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sd $a3, REG_OFFSET(29)($a0)
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sd $a4, REG_OFFSET(30)($a0)
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sd $ra, REG_OFFSET(31)($a0)
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sd $ra, (MCONTEXT_PC)($a0)
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/* copy new context address in $a1 to stack */
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sd $a1, A1_OFFSET($sp)
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/* load new context address into $v0 */
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ld $v0, A1_OFFSET($sp)
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/* load the registers */
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ld $a0, REG_OFFSET(4)($v0)
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ld $a1, REG_OFFSET(5)($v0)
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ld $a2, REG_OFFSET(6)($v0)
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ld $a3, REG_OFFSET(7)($v0)
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ld $a4, REG_OFFSET(8)($v0)
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ld $a5, REG_OFFSET(9)($v0)
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ld $a6, REG_OFFSET(10)($v0)
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ld $a7, REG_OFFSET(11)($v0)
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ld $s0, REG_OFFSET(16)($v0)
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ld $s1, REG_OFFSET(17)($v0)
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ld $s2, REG_OFFSET(18)($v0)
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ld $s3, REG_OFFSET(19)($v0)
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ld $s4, REG_OFFSET(20)($v0)
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ld $s5, REG_OFFSET(21)($v0)
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ld $s6, REG_OFFSET(22)($v0)
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ld $s7, REG_OFFSET(23)($v0)
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ld $gp, REG_OFFSET(28)($v0)
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ld $sp, REG_OFFSET(29)($v0)
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ld $fp, REG_OFFSET(30)($v0)
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ld $ra, REG_OFFSET(31)($v0)
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ld $t9, (MCONTEXT_PC)($v0)
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move $v0, $zero
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jr $t9
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fail:
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dla $t9, exit
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POP_FRAME(__swapcontext)
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move $v0, $zero
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jalr $t9
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END(__swapcontext)
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