_setjmp.S revision 137287 
1/*	$NetBSD: _setjmp.S,v 1.5 2003/04/05 23:08:51 bjh21 Exp $	*/
2
3/*
4 * Copyright (c) 1997 Mark Brinicombe
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by Mark Brinicombe
18 * 4. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <machine/asm.h>
36__FBSDID("$FreeBSD: head/lib/libc/arm/gen/_setjmp.S 137287 2004-11-05 23:53:54Z cognet $");
37
38/*
39 * C library -- _setjmp, _longjmp
40 *
41 *	_longjmp(a,v)
42 * will generate a "return(v)" from the last call to
43 *	_setjmp(a)
44 * by restoring registers from the stack.
45 * The previous signal state is NOT restored.
46 *
47 * Note: r0 is the return value
48 *       r1-r3 are scratch registers in functions
49 */
50
51ENTRY(_setjmp)
52	ldr	r1, .L_setjmp_magic
53	str	r1, [r0], #4
54#ifdef SOFTFLOAT
55	add	r0, r0, #52
56#else
57	/* Store fp registers */
58	sfm	f4, 4, [r0], #48
59	/* Store fpsr */
60	rfs	r1
61	str	r1, [r0], #0x0004
62#endif	/* SOFTFLOAT */
63	/* Store integer registers */
64        stmia	r0, {r4-r14}
65
66        mov	r0, #0x00000000
67        mov	r15, r14
68
69.L_setjmp_magic:
70	.word	_JB_MAGIC__SETJMP
71
72ENTRY(_longjmp)
73	ldr	r2, .L_setjmp_magic
74	ldr	r3, [r0], #4
75	teq	r2, r3
76	bne	botch
77
78#ifdef SOFTFLOAT
79	add	r0, r0, #52
80#else
81	/* Restore fp registers */
82	lfm	f4, 4, [r0], #48
83	/* Restore fpsr */
84	ldr	r4, [r0], #0x0004
85	wfs	r4
86#endif	/* SOFTFLOAT */
87       	/* Restore integer registers */
88        ldmia	r0, {r4-r14}
89
90	/* Validate sp and r14 */
91	teq	sp, #0
92	teqne	r14, #0
93	beq	botch
94
95	/* Set return value */
96	mov	r0, r1
97	teq	r0, #0x00000000
98	moveq	r0, #0x00000001
99	mov	r15, r14
100
101	/* validation failed, die die die. */
102botch:
103	bl	PIC_SYM(_C_LABEL(longjmperror), PLT)
104	bl	PIC_SYM(_C_LABEL(abort), PLT)
105	b	. - 8		/* Cannot get here */
106