33 lines
1.1 KiB
ArmAsm
33 lines
1.1 KiB
ArmAsm
/*
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* Copyright (c) 2018 William Pitcock <nenolod@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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#include "defs.h"
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.globl __swapcontext;
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__swapcontext:
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lgr %r1, %r2 /* use %r1 to save current context to */
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lgr %r0, %r3 /* use %r0 for source context */
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stam %a0, %a15, OFFSET_AREGS(%r1) /* store access registers */
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stmg %r0, %r15, OFFSET_GREGS(%r1) /* store general-purpose registers */
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lgr %r2, %r0 /* swap %r0 to %r2 (XXX: figure out why it hates loading from %r0) */
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lam %a2, %a15, OFFSET_AREGS+8(%r2) /* load access registers, but skip %a0 and %a1 which are for TLS */
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lmg %r0, %r15, OFFSET_GREGS(%r2) /* load general-purpose registers */
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br %r14 /* return to new link register address */
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.weak swapcontext;
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swapcontext = __swapcontext;
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