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 * Copyright (c) 2010 Android Open Source Project.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 *	This product includes software developed by Mark Brinicombe
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#include <machine/asm.h>
38#include <machine/setjmp.h>
39#include <machine/cpu-features.h>
40
41/*
42 * C library -- _setjmp, _longjmp
43 *
44 *	_longjmp(a,v)
45 * will generate a "return(v)" from the last call to
46 *	_setjmp(a)
47 * by restoring registers from the stack.
48 * The previous signal state is NOT restored.
49 *
50 * Note: r0 is the return value
51 *       r1-r3 are scratch registers in functions
52 */
53
54ENTRY(_setjmp)
55	ldr	r1, .L_setjmp_magic
56	str	r1, [r0, #(_JB_MAGIC * 4)]
57
58	/* Store core registers */
59	add     r1, r0, #(_JB_CORE_BASE * 4)
60	stmia   r1, {r4-r14}
61
62#ifdef __ARM_HAVE_VFP
63	/* Store floating-point registers */
64	add     r1, r0, #(_JB_FLOAT_BASE * 4)
65	vstmia  r1, {d8-d15}
66	/* Store floating-point state */
67	fmrx    r1, fpscr
68	str     r1, [r0, #(_JB_FLOAT_STATE * 4)]
69#endif  /* __ARM_HAVE_VFP */
70
71        mov	r0, #0x00000000
72        bx      lr
73END(_setjmp)
74
75.L_setjmp_magic:
76	.word	_JB_MAGIC__SETJMP
77
78ENTRY(_longjmp)
79	ldr	r2, .L_setjmp_magic
80	ldr	r3, [r0, #(_JB_MAGIC * 4)]
81	teq	r2, r3
82	bne	botch
83
84#ifdef __ARM_HAVE_VFP
85	/* Restore floating-point registers */
86	add     r2, r0, #(_JB_FLOAT_BASE * 4)
87	vldmia  r2, {d8-d15}
88	/* Restore floating-point state */
89	ldr     r2, [r0, #(_JB_FLOAT_STATE * 4)]
90	fmxr    fpscr, r2
91#endif /* __ARM_HAVE_VFP */
92
93	/* Restore core registers */
94	add     r2, r0, #(_JB_CORE_BASE * 4)
95	ldmia   r2, {r4-r14}
96
97	/* Validate sp and r14 */
98	teq	sp, #0
99	teqne	r14, #0
100	beq	botch
101
102	/* Set return value */
103	mov	r0, r1
104	teq	r0, #0x00000000
105	moveq	r0, #0x00000001
106	bx      lr
107
108	/* validation failed, die die die. */
109botch:
110	bl	PIC_SYM(_C_LABEL(longjmperror), PLT)
111	bl	PIC_SYM(_C_LABEL(abort), PLT)
112	b	. - 8		/* Cannot get here */
113END(_longjmp)
114