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