1 /* $OpenBSD: process.arm.S,v 1.1 2004/02/11 21:52:49 drahn Exp $ */
5 * Copyright (c) 2004 Dale Rahn. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 #define FRAME_OFFSET 8 /* XXX */
31 #define FRAME_SIZE (52 +(11*4)+FRAME_OFFSET) /* FP + r4-r14 */
33 #define TOP_OF_STACK (0*4)
38 * savecontext(int (*f)(), struct savearea *save, char *newsp)
41 .type savecontext%function
49 sub sp, sp, #FRAME_SIZE
50 add r3, sp, #FRAME_OFFSET
54 /* Store fp registers */
60 /* Store integer registers */
64 str sp, [r1, #TOP_OF_STACK]
65 str r14, [r1, #RETURN]
74 * returnto(struct savearea *area)
77 .type returnto%function
79 ldr sp, [r0, #TOP_OF_STACK]
80 ldr r14, [r0, #RETURN]
81 add r3, sp, #FRAME_OFFSET
86 /* Restore fp registers */
91 #endif /* __SOFTFP__ */
92 /* Restore integer registers */
99 add sp, sp, #FRAME_SIZE