forked from ariadne/libucontext
56 lines
1.4 KiB
ArmAsm
56 lines
1.4 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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#include "defs.h"
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ALIAS(getcontext, libucontext_getcontext)
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FUNC(libucontext_getcontext)
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mov r4, r0 /* move r4 to r0, and increment by REG_OFFSET(REG_MACL) + REG_SZ. */
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add #(REG_OFFSET(REG_MACL + 1)), r0
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sts.l macl, @-r0 /* save macl/mach registers */
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sts.l mach, @-r0
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stc.l gbr, @-r0 /* save gbr register */
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movt r1 /* load T-flag into r1 */
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mov.l r1, @-r0 /* save T-flag as SR register */
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sts.l pr, @-r0 /* save current PR */
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sts.l pr, @-r0 /* save current PR as PC as well */
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mov.l r15, @-r0 /* preserve registers backwards, from r15 to r1 */
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mov.l r14, @-r0
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mov.l r13, @-r0
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mov.l r12, @-r0
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mov.l r11, @-r0
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mov.l r10, @-r0
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mov.l r9, @-r0
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mov.l r8, @-r0
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mov.l r7, @-r0
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mov.l r6, @-r0
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mov.l r5, @-r0
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mov.l r4, @-r0
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mov.l r3, @-r0
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mov.l r2, @-r0
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mov.l r1, @-r0
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mov r0, r1
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mov #0, r0
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mov.l r0, @-r1 /* preserve r0 as explicit zero */
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mov #0, r0 /* set return value as zero */
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rts
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END(libucontext_getcontext)
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