1/*	$OpenBSD: setjmp.h,v 1.6 2023/04/11 00:45:07 jsg Exp $	*/
2/*	$NetBSD: setjmp.h,v 1.2 2001/08/25 14:45:59 bjh21 Exp $	*/
3
4/*
5 * machine/setjmp.h: machine dependent setjmp-related information.
6 */
7
8#define	_JBLEN	64		/* size, in longs, of a jmp_buf */
9
10/*
11 * Description of the setjmp buffer
12 *
13 * word  0	magic number	(dependant on creator)
14 *       1	fpscr		fpscr
15 *       2 - 17	d8 - d15	vfp registers
16 *	18	r13		register 13 (sp) XOR cookie0
17 *	19	r14		register 14 (lr) XOR cookie1
18 *	20	r4		register 4
19 *	21	r5		register 5
20 *	22	r6		register 6
21 *	23	r7		register 7
22 *	24	r8		register 8
23 *	25	r9		register 9
24 *	26	r10		register 10 (sl)
25 *	27	r11		register 11 (fp)
26 *	28	unused		unused
27 *	29	signal mask	(dependant on magic)
28 *	30	(con't)
29 *	31	(con't)
30 *	32	(con't)
31 *
32 * The magic number identifies the jmp_buf and
33 * how the buffer was created as well as providing
34 * a sanity check.
35 *
36 * A side note I should mention - please do not tamper
37 * with the floating point fields. While they are
38 * always saved and restored at the moment this cannot
39 * be guaranteed especially if the compiler happens
40 * to be generating soft-float code so no fp
41 * registers will be used.
42 *
43 * Whilst this can be seen an encouraging people to
44 * use the setjmp buffer in this way I think that it
45 * is for the best then if changes occur compiles will
46 * break rather than just having new builds falling over
47 * mysteriously.
48 */
49
50#define _JB_MAGIC__SETJMP	0x4278f500
51#define _JB_MAGIC_SETJMP	0x4278f501
52
53/* Valid for all jmp_buf's */
54
55#define _JB_MAGIC		 0
56#define _JB_REG_R4		20
57#define _JB_REG_R5		21
58#define _JB_REG_R6		22
59#define _JB_REG_R7		23
60#define _JB_REG_R8		24
61#define _JB_REG_R9		25
62#define _JB_REG_R10		26
63#define _JB_REG_R11		27
64
65/* Only valid with the _JB_MAGIC_SETJMP magic */
66
67#define _JB_SIGMASK		29
68