1 /* $NetBSD: setjmp.h,v 1.2 2001/08/25 14:45:59 bjh21 Exp $ */
2 /* $FreeBSD$ */
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 #if __BSD_VISIBLE || __POSIX_VISIBLE || __XSI_VISIBLE
91 typedef struct _sigjmp_buf { int _sjb[_JBLEN + 1]; } sigjmp_buf[1];
92 #endif
93
94 typedef struct _jmp_buf { int _jb[_JBLEN + 1]; } jmp_buf[1];
95
96 #endif /* !_MACHINE_SETJMP_H_ */
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