1/*	$NetBSD: setjmp.h,v 1.5 2013/01/11 13:56:32 matt Exp $	*/
2
3/*
4 * machine/setjmp.h: machine dependent setjmp-related information.
5 */
6
7#ifndef _MACHINE_SETJMP_H_
8#define _MACHINE_SETJMP_H_
9
10#define	_JBLEN	64		/* size, in longs, of a jmp_buf */
11
12/*
13 * NOTE: The internal structure of a jmp_buf is *PRIVATE*
14 *       This information is provided as there is software
15 *       that fiddles with this with obtain the stack pointer
16 *	 (yes really ! and its commercial !).
17 *
18 * Description of the setjmp buffer
19 *
20 * word  0	magic number	(dependent on creator)
21 *	13	fpscr		vfp status control register
22 *	14	r4		register 4
23 *	15	r5		register 5
24 *	16	r6		register 6
25 *	17	r7		register 7
26 *	18	r8		register 8
27 *	19	r9		register 9
28 *	20	r10		register 10 (sl)
29 *	21	r11		register 11 (fp)
30 *	22	r12		register 12 (ip)
31 *	23	r13		register 13 (sp)
32 *	24	r14		register 14 (lr)
33 *	25	signal mask	(dependent on magic)
34 *	26	(con't)
35 *	27	(con't)
36 *	28	(con't)
37 *	32-33	d8		(vfp register d8)
38 *	34-35	d9		(vfp register d9)
39 *	36-37	d10		(vfp register d10)
40 *	38-39	d11		(vfp register d11)
41 *	40-41	d12		(vfp register d12)
42 *	42-43	d13		(vfp register d13)
43 *	44-45	d14		(vfp register d14)
44 *	46-47	d15		(vfp register d15)
45 *
46 * The magic 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#define _JB_MAGIC__SETJMP_VFP	0x4278f502
67#define _JB_MAGIC_SETJMP_VFP	0x4278f503
68
69/* Valid for all jmp_buf's */
70
71#define _JB_MAGIC		 0
72#define _JB_REG_FPSCR		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
89#define	_JB_REG_D8		32
90#define	_JB_REG_D9		34
91#define	_JB_REG_D10		36
92#define	_JB_REG_D11		38
93#define	_JB_REG_D12		40
94#define	_JB_REG_D13		42
95#define	_JB_REG_D14		44
96#define	_JB_REG_D15		46
97
98#ifndef __ASSEMBLER__
99#if __BSD_VISIBLE || __POSIX_VISIBLE || __XSI_VISIBLE
100typedef struct _sigjmp_buf { int _sjb[_JBLEN + 1]; } sigjmp_buf[1];
101#endif
102
103typedef struct _jmp_buf { int _jb[_JBLEN + 1]; } jmp_buf[1];
104#endif
105
106#endif /* !_MACHINE_SETJMP_H_ */
107