libucontext/arch/s390x/startcontext.S

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2018-02-15 05:54:17 +00:00
/*
* Copyright (c) 2018 Ariadne Conill <ariadne@dereferenced.org>
2018-02-15 05:54:17 +00:00
*
* 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.
*/
#include "defs.h"
.globl __start_context;
__start_context:
basr %r14, %r7 /* run function pointer (%r7) and return here */
ltgr %r8, %r8 /* check to see if uc_link (%r8) is null */
jz no_linked_context /* if we have no linked context, prepare to exit */
lgr %r2, %r8 /* copy the uc_link structure address to %r2 */
br %r9 /* call setcontext */
no_linked_context:
la %r2, 0 /* return 0 */
brasl %r14, exit@plt /* call exit */
j .+2 /* crash if exit returns */