_setjmp.S revision 251392 
1/*	$NetBSD: _setjmp.S,v 1.12 2013/04/19 13:45:45 matt 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#if !defined(__SOFTFP__) && !defined(__VFP_FP__) && !defined(__ARM_PCS)
36#error FPA is not supported anymore
37#endif
38
39#ifdef __ARM_EABI__
40	.fpu	vfp
41#endif
42
43#include <machine/asm.h>
44#include <machine/setjmp.h>
45
46__FBSDID("$FreeBSD: head/lib/libc/arm/gen/_setjmp.S 251392 2013-06-04 19:47:26Z andrew $");
47
48/*
49 * C library -- _setjmp, _longjmp
50 *
51 *	_longjmp(a,v)
52 * will generate a "return(v)" from the last call to
53 *	_setjmp(a)
54 * by restoring registers from the stack.
55 * The previous signal state is NOT restored.
56 *
57 * Note: r0 is the return value
58 *       r1-r3,ip are scratch registers in functions
59 */
60
61ENTRY(_setjmp)
62	ldr	r1, .L_setjmp_magic
63
64	str	r1, [r0]
65
66	add	r0, r0, #(_JB_REG_R4 * 4)
67	/* Store integer registers */
68        stmia	r0, {r4-r14}
69
70        mov	r0, #0x00000000
71	RET
72
73.L_setjmp_magic:
74	.word	_JB_MAGIC__SETJMP
75
76WEAK_ALIAS(___longjmp, _longjmp)
77ENTRY(_longjmp)
78	ldr	r2, [r0]			/* get magic from jmp_buf */
79	ldr	ip, .L_setjmp_magic		/* load magic */
80	teq	ip, r2				/* magic correct? */
81	bne	botch				/*   no, botch */
82
83	add	r0, r0, #(_JB_REG_R4 * 4)
84       	/* Restore integer registers */
85        ldmia	r0, {r4-r14}
86
87	/* Validate sp and r14 */
88	teq	sp, #0
89	teqne	r14, #0
90	beq	botch
91
92	/* Set return value */
93	movs	r0, r1
94	moveq	r0, #0x00000001
95	RET
96
97	/* validation failed, die die die. */
98botch:
99#if !defined(_STANDALONE)
100	bl	PIC_SYM(_C_LABEL(longjmperror), PLT)
101	bl	PIC_SYM(_C_LABEL(abort), PLT)
102	b	. - 8		/* Cannot get here */
103#else
104	b	.
105#endif
106