1 /* $NetBSD: setjmp.h,v 1.2 2001/08/25 14:45:59 bjh21 Exp $ */
5 * machine/setjmp.h: machine dependent setjmp-related information.
8 #ifndef _MACHINE_SETJMP_H_
9 #define _MACHINE_SETJMP_H_
11 #define _JBLEN 64 /* size, in longs, of a jmp_buf */
13 #define _JBLEN 29 /* size, in longs, of a jmp_buf */
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 !).
22 * Description of the setjmp buffer
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
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)
46 * The magic number number identifies the jmp_buf and
47 * how the buffer was created as well as providing
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.
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
64 #define _JB_MAGIC__SETJMP 0x4278f500
65 #define _JB_MAGIC_SETJMP 0x4278f501
67 /* Valid for all jmp_buf's */
74 #define _JB_REG_FPSR 13
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
87 /* Only valid with the _JB_MAGIC_SETJMP magic */
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];
94 typedef struct _jmp_buf { int _jb[_JBLEN + 1]; } jmp_buf[1];
96 #endif /* !_MACHINE_SETJMP_H_ */