Annotation of sys/arch/arm/include/setjmp.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: setjmp.h,v 1.1 2004/02/01 05:09:49 drahn 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: #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
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