_setjmp.S revision 1dc9e472e19acfe6dc7f41e429236e7eef7ceda1 
1/*	$OpenBSD: _setjmp.S,v 1.2 2004/02/01 05:40:52 drahn Exp $	*/
2/*	$NetBSD: _setjmp.S,v 1.5 2003/04/05 23:08:51 bjh21 Exp $	*/
3
4/*
5 * Copyright (c) 1997 Mark Brinicombe
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by Mark Brinicombe
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <machine/asm.h>
37#include <machine/setjmp.h>
38
39/*
40 * C library -- _setjmp, _longjmp
41 *
42 *	_longjmp(a,v)
43 * will generate a "return(v)" from the last call to
44 *	_setjmp(a)
45 * by restoring registers from the stack.
46 * The previous signal state is NOT restored.
47 *
48 * Note: r0 is the return value
49 *       r1-r3 are scratch registers in functions
50 */
51
52ENTRY(_setjmp)
53	ldr	r1, .L_setjmp_magic
54	str	r1, [r0], #4
55#ifdef SOFTFLOAT
56	add	r0, r0, #52
57#else
58	/* Store fp registers */
59	sfm	f4, 4, [r0], #48
60	/* Store fpsr */
61	rfs	r1
62	str	r1, [r0], #0x0004
63#endif	/* SOFTFLOAT */
64	/* Store integer registers */
65        stmia	r0, {r4-r14}
66
67        mov	r0, #0x00000000
68        bx      lr
69
70.L_setjmp_magic:
71	.word	_JB_MAGIC__SETJMP
72
73ENTRY(_longjmp)
74	ldr	r2, .L_setjmp_magic
75	ldr	r3, [r0], #4
76	teq	r2, r3
77	bne	botch
78
79#ifdef SOFTFLOAT
80	add	r0, r0, #52
81#else
82	/* Restore fp registers */
83	lfm	f4, 4, [r0], #48
84	/* Restore fpsr */
85	ldr	r4, [r0], #0x0004
86	wfs	r4
87#endif	/* SOFTFLOAT */
88       	/* Restore integer registers */
89        ldmia	r0, {r4-r14}
90
91	/* Validate sp and r14 */
92	teq	sp, #0
93	teqne	r14, #0
94	beq	botch
95
96	/* Set return value */
97	mov	r0, r1
98	teq	r0, #0x00000000
99	moveq	r0, #0x00000001
100	bx      lr
101
102	/* validation failed, die die die. */
103botch:
104	bl	PIC_SYM(_C_LABEL(longjmperror), PLT)
105	bl	PIC_SYM(_C_LABEL(abort), PLT)
106	b	. - 8		/* Cannot get here */
107