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bb0cfa24 DF |
1 | /* |
2 | * Copyright (c) 1980 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | * | |
9822e909 | 6 | * @(#)a.out.h 5.2 (Berkeley) %G% |
bb0cfa24 | 7 | */ |
6f86c72f SL |
8 | |
9 | /* | |
8715e60f SL |
10 | * Definitions of the a.out header |
11 | * and magic numbers are shared with | |
12 | * the kernel. | |
6f86c72f | 13 | */ |
8715e60f | 14 | #include <sys/exec.h> |
6f86c72f SL |
15 | |
16 | /* | |
17 | * Macros which take exec structures as arguments and tell whether | |
18 | * the file has a reasonable magic number or offsets to text|symbols|strings. | |
19 | */ | |
20 | #define N_BADMAG(x) \ | |
21 | (((x).a_magic)!=OMAGIC && ((x).a_magic)!=NMAGIC && ((x).a_magic)!=ZMAGIC) | |
22 | ||
23 | #define N_TXTOFF(x) \ | |
24 | ((x).a_magic==ZMAGIC ? 1024 : sizeof (struct exec)) | |
25 | #define N_SYMOFF(x) \ | |
26 | (N_TXTOFF(x) + (x).a_text+(x).a_data + (x).a_trsize+(x).a_drsize) | |
27 | #define N_STROFF(x) \ | |
28 | (N_SYMOFF(x) + (x).a_syms) | |
29 | ||
30 | /* | |
31 | * Format of a relocation datum. | |
32 | */ | |
33 | struct relocation_info { | |
34 | int r_address; /* address which is relocated */ | |
35 | unsigned int r_symbolnum:24, /* local symbol ordinal */ | |
36 | r_pcrel:1, /* was relocated pc relative already */ | |
37 | r_length:2, /* 0=byte, 1=word, 2=long */ | |
38 | r_extern:1, /* does not include value of sym referenced */ | |
39 | :4; /* nothing, yet */ | |
40 | }; | |
41 | ||
42 | /* | |
43 | * Format of a symbol table entry; this file is included by <a.out.h> | |
44 | * and should be used if you aren't interested the a.out header | |
45 | * or relocation information. | |
46 | */ | |
47 | struct nlist { | |
48 | union { | |
49 | char *n_name; /* for use when in-core */ | |
50 | long n_strx; /* index into file string table */ | |
51 | } n_un; | |
52 | unsigned char n_type; /* type flag, i.e. N_TEXT etc; see below */ | |
53 | char n_other; /* unused */ | |
54 | short n_desc; /* see <stab.h> */ | |
55 | unsigned long n_value; /* value of this symbol (or sdb offset) */ | |
56 | }; | |
57 | #define n_hash n_desc /* used internally by ld */ | |
58 | ||
59 | /* | |
60 | * Simple values for n_type. | |
61 | */ | |
62 | #define N_UNDF 0x0 /* undefined */ | |
63 | #define N_ABS 0x2 /* absolute */ | |
64 | #define N_TEXT 0x4 /* text */ | |
65 | #define N_DATA 0x6 /* data */ | |
66 | #define N_BSS 0x8 /* bss */ | |
67 | #define N_COMM 0x12 /* common (internal to ld) */ | |
9822e909 | 68 | #define N_FN 0x1e /* file name symbol */ |
6f86c72f SL |
69 | |
70 | #define N_EXT 01 /* external bit, or'ed in */ | |
71 | #define N_TYPE 0x1e /* mask for all the type bits */ | |
72 | ||
73 | /* | |
74 | * Sdb entries have some of the N_STAB bits set. | |
75 | * These are given in <stab.h> | |
76 | */ | |
77 | #define N_STAB 0xe0 /* if any of these bits set, a SDB entry */ | |
78 | ||
79 | /* | |
80 | * Format for namelist values. | |
81 | */ | |
82 | #define N_FORMAT "%08x" |