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 * 6 * @(#)a.out.h 5.4 (Berkeley) 12/17/90 7 */ 8 9 /* 10 * Definitions of the a.out header 11 * and magic numbers are shared with 12 * the kernel. 13 */ 14 #include <sys/exec.h> 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 #if defined(vax) || defined(tahoe) 24 #define N_TXTOFF(x) \ 25 ((x).a_magic == ZMAGIC ? 1024 : sizeof (struct exec)) 26 #endif 27 28 #if defined(hp300) || defined(i386) 29 #define N_TXTOFF(x) \ 30 ((x).a_magic == ZMAGIC ? 4096 : sizeof (struct exec)) 31 #endif 32 33 #define N_SYMOFF(x) \ 34 (N_TXTOFF(x) + (x).a_text+(x).a_data + (x).a_trsize+(x).a_drsize) 35 36 #define N_STROFF(x) \ 37 (N_SYMOFF(x) + (x).a_syms) 38 39 /* 40 * Format of a relocation datum. 41 */ 42 struct relocation_info { 43 int r_address; /* address which is relocated */ 44 unsigned int r_symbolnum:24, /* local symbol ordinal */ 45 r_pcrel:1, /* was relocated pc relative already */ 46 r_length:2, /* 0=byte, 1=word, 2=long */ 47 r_extern:1, /* does not include value of sym referenced */ 48 :4; /* nothing, yet */ 49 }; 50 51 /* 52 * Format of a symbol table entry; this file is included by <a.out.h> 53 * and should be used if you aren't interested the a.out header 54 * or relocation information. 55 */ 56 struct nlist { 57 union { 58 char *n_name; /* for use when in-core */ 59 long n_strx; /* index into file string table */ 60 } n_un; 61 unsigned char n_type; /* type flag, i.e. N_TEXT etc; see below */ 62 char n_other; /* unused */ 63 short n_desc; /* see <stab.h> */ 64 unsigned long n_value; /* value of this symbol (or sdb offset) */ 65 }; 66 #define n_hash n_desc /* used internally by ld */ 67 68 /* 69 * Simple values for n_type. 70 */ 71 #define N_UNDF 0x0 /* undefined */ 72 #define N_ABS 0x2 /* absolute */ 73 #define N_TEXT 0x4 /* text */ 74 #define N_DATA 0x6 /* data */ 75 #define N_BSS 0x8 /* bss */ 76 #define N_COMM 0x12 /* common (internal to ld) */ 77 #define N_FN 0x1e /* file name symbol */ 78 79 #define N_EXT 01 /* external bit, or'ed in */ 80 #define N_TYPE 0x1e /* mask for all the type bits */ 81 82 /* 83 * Sdb entries have some of the N_STAB bits set. 84 * These are given in <stab.h> 85 */ 86 #define N_STAB 0xe0 /* if any of these bits set, a SDB entry */ 87 88 /* 89 * Format for namelist values. 90 */ 91 #define N_FORMAT "%08x" 92