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/* $OpenBSD: process.arm.S,v 1.2 2006/11/17 20:54:47 deraadt Exp $ */
/*
* Copyright (c) 2004 Dale Rahn. All rights reserved.
*
* 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>
#define FRAME_OFFSET 8 /* XXX */
#define FRAME_SIZE (52 +(11*4)+FRAME_OFFSET) /* FP + r4-r14 */
#define TOP_OF_STACK (0*4)
#define RETURN (1*4)
/*
* savecontext(int (*f)(), struct savearea *save, char *newsp)
*/
.globl savecontext
.type savecontext%function
savecontext:
str r2, [r1]
ldr r3, .LPRE_Block
mov r2, #1
str r2, [r3]
ldr r2, [r1]
sub sp, sp, #FRAME_SIZE
add r3, sp, #FRAME_OFFSET
#if __SOFTFP__
add r3, r3, #52
#else
/* Store fp registers */
sfm f4, 4, [r3], #48
/* Store fpsr */
rfs r3
str r3, [r3], #0x0004
#endif /*__SOFTFP__*/
/* Store integer registers */
stmia r3, {r4-r13}
/* SAVE SP */
str sp, [r1, #TOP_OF_STACK]
str r14, [r1, #RETURN]
cmp r2, #0
movne sp, r2
mov r15, r0
.LPRE_Block:
.word PRE_Block
/*
* returnto(struct savearea *area)
*/
.globl returnto
.type returnto%function
returnto:
ldr sp, [r0, #TOP_OF_STACK]
ldr r14, [r0, #RETURN]
add r3, sp, #FRAME_OFFSET
mov r1, r3
#if __SOFTFP__
add r3, r3, #52
#else
/* Restore fp registers */
lfm f4, 4, [r3], #48
/* Restore FPSR */
ldr r4, [r3], #0x0004
wfs r4
#endif /* __SOFTFP__ */
/* Restore integer registers */
ldmia r3, {r4-r13}
ldr r3, .LPRE_Block
mov r2, #0
str r2, [r3]
add sp, sp, #FRAME_SIZE
#ifdef __ARM_26__
mov r15, r14
#else
mov r15, r14
#endif
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