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/* $OpenBSD: process.sh.S,v 1.6 2007/03/03 13:40:45 deraadt Exp $ */
/*
* Copyright (c) 2006 Theo de Raadt
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <config.h>
#undef RCSID
#include <machine/asm.h>
/*
# savecontext(f, area1, newsp)
# int (*f)(); struct savearea *area1; char *newsp;
# r4 r5 r6
*/
ENTRY(savecontext)
mov.l .L_PRE_Block, r0 /* PRE_Block = 1 */
mov #1, r1
mov.l r1, @r0
/* sp == r15 - automatically handled */
mov.l r14, @-sp
mov.l r13, @-sp
mov.l r12, @-sp
mov.l r11, @-sp
mov.l r10, @-sp
mov.l r9, @-sp
mov.l r8, @-sp
sts.l pr, @-sp
sts.l macl, @-sp
sts.l mach, @-sp
#if defined(__SH4__) && !defined(__SH4_NOFPU__)
/* float point registers */
sts fpscr, r0
mov.l r0, @-sp
mov #0, r1
sts.l fpul, @-sp
lds r1, fpscr
fmov.s fr15, @-sp
fmov.s fr14, @-sp
fmov.s fr13, @-sp
fmov.s fr12, @-sp
frchg
fmov.s fr15, @-sp
fmov.s fr14, @-sp
fmov.s fr13, @-sp
fmov.s fr12, @-sp
lds r0, fpscr
#endif
mov.l sp,@r5 /* store top of stack */
tst r6,r6
bt 1f
mov r6,sp /* swap to new sp */
mov sp, r14 /* frame pointer */
1:
jmp @r4
nop
.align 2
.L_PRE_Block: .long _C_LABEL(PRE_Block)
SET_ENTRY_SIZE(savecontext)
/*
* returnto(struct savearea *r4)
*/
ENTRY(returnto)
mov.l @r4, sp
#if defined(__SH4__) && !defined(__SH4_NOFPU__)
/* float point registers */
mov #0, r1
lds r1, fpscr
frchg
fmov.s @sp+, fr12
fmov.s @sp+, fr13
fmov.s @sp+, fr14
fmov.s @sp+, fr15
frchg
fmov.s @sp+, fr12
fmov.s @sp+, fr13
fmov.s @sp+, fr14
fmov.s @sp+, fr15
lds.l @sp+, fpul
lds.l @sp+, fpscr
#endif
lds.l @sp+, mach
lds.l @sp+, macl
lds.l @sp+, pr
mov.l @sp+, r8
mov.l @sp+, r9
mov.l @sp+, r10
mov.l @sp+, r11
mov.l @sp+, r12
mov.l @sp+, r13
mov.l @sp+, r14
/* sp == r15 - automatically handled */
mov.l .L_PRE_Block2, r0 /* PRE_Block = 0 */
mov #0, r4
mov.l r4, @r0
rts
nop
.align 2
.L_PRE_Block2: .long _C_LABEL(PRE_Block)
SET_ENTRY_SIZE(returnto)
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