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