setjmp.h revision 249180 
1/*	$NetBSD: setjmp.h,v 1.2 2001/08/25 14:45:59 bjh21 Exp $	*/
2/* $FreeBSD: head/sys/arm/include/setjmp.h 249180 2013-04-06 00:47:33Z andrew $ */
3
4/*
5 * machine/setjmp.h: machine dependent setjmp-related information.
6 */
7
8#ifndef _MACHINE_SETJMP_H_
9#define _MACHINE_SETJMP_H_
10#ifdef __ELF__
11#define	_JBLEN	64		/* size, in longs, of a jmp_buf */
12#else
13#define	_JBLEN	29		/* size, in longs, of a jmp_buf */
14#endif
15
16/*
17 * NOTE: The internal structure of a jmp_buf is *PRIVATE*
18 *       This information is provided as there is software
19 *       that fiddles with this with obtain the stack pointer
20 *	 (yes really ! and its commercial !).
21 *
22 * Description of the setjmp buffer
23 *
24 * word  0	magic number	(dependant on creator)
25 *       1 -  3	f4		fp register 4
26 *	 4 -  6	f5		fp register 5
27 *	 7 -  9 f6		fp register 6
28 *	10 - 12	f7		fp register 7
29 *	13	fpsr		fp status register
30 *	14	r4		register 4
31 *	15	r5		register 5
32 *	16	r6		register 6
33 *	17	r7		register 7
34 *	18	r8		register 8
35 *	19	r9		register 9
36 *	20	r10		register 10 (sl)
37 *	21	r11		register 11 (fp)
38 *	22	r12		register 12 (ip)
39 *	23	r13		register 13 (sp)
40 *	24	r14		register 14 (lr)
41 *	25	signal mask	(dependant on magic)
42 *	26	(con't)
43 *	27	(con't)
44 *	28	(con't)
45 *
46 * The magic number number identifies the jmp_buf and
47 * how the buffer was created as well as providing
48 * a sanity check
49 *
50 * A side note I should mention - Please do not tamper
51 * with the floating point fields. While they are
52 * always saved and restored at the moment this cannot
53 * be garenteed especially if the compiler happens
54 * to be generating soft-float code so no fp
55 * registers will be used.
56 *
57 * Whilst this can be seen an encouraging people to
58 * use the setjmp buffer in this way I think that it
59 * is for the best then if changes occur compiles will
60 * break rather than just having new builds falling over
61 * mysteriously.
62 */
63
64#define _JB_MAGIC__SETJMP	0x4278f500
65#define _JB_MAGIC_SETJMP	0x4278f501
66
67/* Valid for all jmp_buf's */
68
69#define _JB_MAGIC		 0
70#define _JB_REG_F4		 1
71#define _JB_REG_F5		 4
72#define _JB_REG_F6		 7
73#define _JB_REG_F7		10
74#define _JB_REG_FPSR		13
75#define _JB_REG_R4		14
76#define _JB_REG_R5		15
77#define _JB_REG_R6		16
78#define _JB_REG_R7		17
79#define _JB_REG_R8		18
80#define _JB_REG_R9		19
81#define _JB_REG_R10		20
82#define _JB_REG_R11		21
83#define _JB_REG_R12		22
84#define _JB_REG_R13		23
85#define _JB_REG_R14		24
86
87/* Only valid with the _JB_MAGIC_SETJMP magic */
88
89#define _JB_SIGMASK		25
90
91#ifndef __ASSEMBLER__
92#if __BSD_VISIBLE || __POSIX_VISIBLE || __XSI_VISIBLE
93typedef struct _sigjmp_buf { int _sjb[_JBLEN + 1]; } sigjmp_buf[1];
94#endif
95
96typedef struct _jmp_buf { int _jb[_JBLEN + 1]; } jmp_buf[1];
97#endif
98
99#endif /* !_MACHINE_SETJMP_H_ */
100