setjmp.h revision 129198 
1/*	$NetBSD: setjmp.h,v 1.2 2001/08/25 14:45:59 bjh21 Exp $	*/
2/* $FreeBSD: head/sys/arm/include/setjmp.h 129198 2004-05-14 11:46:45Z cognet $ */
3
4/*
5 * machine/setjmp.h: machine dependent setjmp-related information.
6 */
7
8#ifdef __ELF__
9#define	_JBLEN	64		/* size, in longs, of a jmp_buf */
10#else
11#define	_JBLEN	29		/* size, in longs, of a jmp_buf */
12#endif
13
14/*
15 * NOTE: The internal structure of a jmp_buf is *PRIVATE*
16 *       This information is provided as there is software
17 *       that fiddles with this with obtain the stack pointer
18 *	 (yes really ! and its commercial !).
19 *
20 * Description of the setjmp buffer
21 *
22 * word  0	magic number	(dependant on creator)
23 *       1 -  3	f4		fp register 4
24 *	 4 -  6	f5		fp register 5
25 *	 7 -  9 f6		fp register 6
26 *	10 - 12	f7		fp register 7
27 *	13	fpsr		fp status register
28 *	14	r4		register 4
29 *	15	r5		register 5
30 *	16	r6		register 6
31 *	17	r7		register 7
32 *	18	r8		register 8
33 *	19	r9		register 9
34 *	20	r10		register 10 (sl)
35 *	21	r11		register 11 (fp)
36 *	22	r12		register 12 (ip)
37 *	23	r13		register 13 (sp)
38 *	24	r14		register 14 (lr)
39 *	25	signal mask	(dependant on magic)
40 *	26	(con't)
41 *	27	(con't)
42 *	28	(con't)
43 *
44 * The magic number number identifies the jmp_buf and
45 * how the buffer was created as well as providing
46 * a sanity check
47 *
48 * A side note I should mention - Please do not tamper
49 * with the floating point fields. While they are
50 * always saved and restored at the moment this cannot
51 * be garenteed especially if the compiler happens
52 * to be generating soft-float code so no fp
53 * registers will be used.
54 *
55 * Whilst this can be seen an encouraging people to
56 * use the setjmp buffer in this way I think that it
57 * is for the best then if changes occur compiles will
58 * break rather than just having new builds falling over
59 * mysteriously.
60 */
61
62#define _JB_MAGIC__SETJMP	0x4278f500
63#define _JB_MAGIC_SETJMP	0x4278f501
64
65/* Valid for all jmp_buf's */
66
67#define _JB_MAGIC		 0
68#define _JB_REG_F4		 1
69#define _JB_REG_F5		 4
70#define _JB_REG_F6		 7
71#define _JB_REG_F7		10
72#define _JB_REG_FPSR		13
73#define _JB_REG_R4		14
74#define _JB_REG_R5		15
75#define _JB_REG_R6		16
76#define _JB_REG_R7		17
77#define _JB_REG_R8		18
78#define _JB_REG_R9		19
79#define _JB_REG_R10		20
80#define _JB_REG_R11		21
81#define _JB_REG_R12		22
82#define _JB_REG_R13		23
83#define _JB_REG_R14		24
84
85/* Only valid with the _JB_MAGIC_SETJMP magic */
86
87#define _JB_SIGMASK		25
88#if __BSD_VISIBLE || __POSIX_VISIBLE || __XSI_VISIBLE
89typedef struct _sigjmp_buf { int _sjb[_JBLEN + 1]; } sigjmp_buf[1];
90#endif
91
92typedef struct _jmp_buf { int _jb[_JBLEN + 1]; } jmp_buf[1];
93
94