libucontext/arch/sh/getcontext.S

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ArmAsm
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/*
* Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
*
* 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"
ALIAS(getcontext, libucontext_getcontext)
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ALIAS(__getcontext, libucontext_getcontext)
FUNC(libucontext_getcontext)
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mov r4, r0 /* move r4 to r0, and increment by REG_OFFSET(REG_MACL) + REG_SZ. */
add #(REG_OFFSET(REG_MACL + 1)), r0
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sts.l macl, @-r0 /* save macl/mach registers */
sts.l mach, @-r0
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stc.l gbr, @-r0 /* save gbr register */
movt r1 /* load T-flag into r1 */
mov.l r1, @-r0 /* save T-flag as SR register */
sts.l pr, @-r0 /* save current PR */
sts.l pr, @-r0 /* save current PR as PC as well */
mov.l r15, @-r0 /* preserve registers backwards, from r15 to r1 */
mov.l r14, @-r0
mov.l r13, @-r0
mov.l r12, @-r0
mov.l r11, @-r0
mov.l r10, @-r0
mov.l r9, @-r0
mov.l r8, @-r0
mov.l r7, @-r0
mov.l r6, @-r0
mov.l r5, @-r0
mov.l r4, @-r0
mov.l r3, @-r0
mov.l r2, @-r0
mov.l r1, @-r0
mov r0, r1
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 */
rts
END(libucontext_getcontext)