1/*	$NetBSD: setjmp.h,v 1.5 2013/01/11 13:56:32 matt Exp $	*/
2/* $FreeBSD$ */
3
4/*
5 * machine/setjmp.h: machine dependent setjmp-related information.
6 */
7
8#ifndef _MACHINE_SETJMP_H_
9#define _MACHINE_SETJMP_H_
10
11#define	_JBLEN	64		/* size, in longs, of a jmp_buf */
12
13/*
14 * NOTE: The internal structure of a jmp_buf is *PRIVATE*
15 *       This information is provided as there is software
16 *       that fiddles with this with obtain the stack pointer
17 *	 (yes really ! and its commercial !).
18 *
19 * Description of the setjmp buffer
20 *
21 * word  0	magic number	(dependent on creator)
22 *	13	fpscr		vfp status control register
23 *	14	r4		register 4
24 *	15	r5		register 5
25 *	16	r6		register 6
26 *	17	r7		register 7
27 *	18	r8		register 8
28 *	19	r9		register 9
29 *	20	r10		register 10 (sl)
30 *	21	r11		register 11 (fp)
31 *	22	r12		register 12 (ip)
32 *	23	r13		register 13 (sp)
33 *	24	r14		register 14 (lr)
34 *	25	signal mask	(dependent on magic)
35 *	26	(con't)
36 *	27	(con't)
37 *	28	(con't)
38 *	32-33	d8		(vfp register d8)
39 *	34-35	d9		(vfp register d9)
40 *	36-37	d10		(vfp register d10)
41 *	38-39	d11		(vfp register d11)
42 *	40-41	d12		(vfp register d12)
43 *	42-43	d13		(vfp register d13)
44 *	44-45	d14		(vfp register d14)
45 *	46-47	d15		(vfp register d15)
46 *
47 * The magic number number identifies the jmp_buf and
48 * how the buffer was created as well as providing
49 * a sanity check
50 *
51 * A side note I should mention - Please do not tamper
52 * with the floating point fields. While they are
53 * always saved and restored at the moment this cannot
54 * be garenteed especially if the compiler happens
55 * to be generating soft-float code so no fp
56 * registers will be used.
57 *
58 * Whilst this can be seen an encouraging people to
59 * use the setjmp buffer in this way I think that it
60 * is for the best then if changes occur compiles will
61 * break rather than just having new builds falling over
62 * mysteriously.
63 */
64
65#define _JB_MAGIC__SETJMP	0x4278f500
66#define _JB_MAGIC_SETJMP	0x4278f501
67#define _JB_MAGIC__SETJMP_VFP	0x4278f502
68#define _JB_MAGIC_SETJMP_VFP	0x4278f503
69
70/* Valid for all jmp_buf's */
71
72#define _JB_MAGIC		 0
73#define _JB_REG_FPSCR		13
74#define _JB_REG_R4		14
75#define _JB_REG_R5		15
76#define _JB_REG_R6		16
77#define _JB_REG_R7		17
78#define _JB_REG_R8		18
79#define _JB_REG_R9		19
80#define _JB_REG_R10		20
81#define _JB_REG_R11		21
82#define _JB_REG_R12		22
83#define _JB_REG_R13		23
84#define _JB_REG_R14		24
85
86/* Only valid with the _JB_MAGIC_SETJMP magic */
87
88#define _JB_SIGMASK		25
89
90#define	_JB_REG_D8		32
91#define	_JB_REG_D9		34
92#define	_JB_REG_D10		36
93#define	_JB_REG_D11		38
94#define	_JB_REG_D12		40
95#define	_JB_REG_D13		42
96#define	_JB_REG_D14		44
97#define	_JB_REG_D15		46
98
99#ifndef __ASSEMBLER__
100#if __BSD_VISIBLE || __POSIX_VISIBLE || __XSI_VISIBLE
101typedef struct _sigjmp_buf { int _sjb[_JBLEN + 1]; } sigjmp_buf[1];
102#endif
103
104typedef struct _jmp_buf { int _jb[_JBLEN + 1]; } jmp_buf[1];
105#endif
106
107#endif /* !_MACHINE_SETJMP_H_ */
108