2018-02-06 06:19:44 +00:00
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/*
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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 __start_context;
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.hidden __start_context;
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__start_context:
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2018-02-15 04:36:47 +00:00
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cmpdi 31,0 /* test if ucontext link pointer is null */
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beq no_linked_context /* if it is, exit */
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2018-02-06 08:05:53 +00:00
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/* now, call SYS_swapcontext */
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2018-02-15 04:36:47 +00:00
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mr 4,31 /* ucp is in r31 */
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li 3,0 /* don't care about restoring, set oucp to NULL */
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li 5,1696 /* sizeof(ucontext_t) */
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li 0,249 /* SYS_swapcontext */
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2018-02-06 08:05:53 +00:00
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sc
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/* we should not wind back up here, if we do, exit with -1 */
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li 3,-1
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2018-02-06 06:19:44 +00:00
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2018-02-15 04:36:47 +00:00
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no_linked_context:
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2018-02-06 06:19:44 +00:00
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b exit@GOT
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nop
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