projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 6f86c72f SL |
1 | /* a.out.h 4.1 83/05/03 */ |
| 2 | ||
| 3 | /* | |
| 4 | * Header prepended to each a.out file. | |
| 5 | */ | |
| 6 | struct exec { | |
| 7 | long a_magic; /* magic number */ | |
| 8 | unsigned long a_text; /* size of text segment */ | |
| 9 | unsigned long a_data; /* size of initialized data */ | |
| 10 | unsigned long a_bss; /* size of uninitialized data */ | |
| 11 | unsigned long a_syms; /* size of symbol table */ | |
| 12 | unsigned long a_entry; /* entry point */ | |
| 13 | unsigned long a_trsize; /* size of text relocation */ | |
| 14 | unsigned long a_drsize; /* size of data relocation */ | |
| 15 | }; | |
| 16 | ||
| 17 | #define OMAGIC 0407 /* old impure format */ | |
| 18 | #define NMAGIC 0410 /* read-only text */ | |
| 19 | #define ZMAGIC 0413 /* demand load format */ | |
| 20 | ||
| 21 | /* | |
| 22 | * Macros which take exec structures as arguments and tell whether | |
| 23 | * the file has a reasonable magic number or offsets to text|symbols|strings. | |
| 24 | */ | |
| 25 | #define N_BADMAG(x) \ | |
| 26 | (((x).a_magic)!=OMAGIC && ((x).a_magic)!=NMAGIC && ((x).a_magic)!=ZMAGIC) | |
| 27 | ||
| 28 | #define N_TXTOFF(x) \ | |
| 29 | ((x).a_magic==ZMAGIC ? 1024 : sizeof (struct exec)) | |
| 30 | #define N_SYMOFF(x) \ | |
| 31 | (N_TXTOFF(x) + (x).a_text+(x).a_data + (x).a_trsize+(x).a_drsize) | |
| 32 | #define N_STROFF(x) \ | |
| 33 | (N_SYMOFF(x) + (x).a_syms) | |
| 34 | ||
| 35 | /* | |
| 36 | * Format of a relocation datum. | |
| 37 | */ | |
| 38 | struct relocation_info { | |
| 39 | int r_address; /* address which is relocated */ | |
| 40 | unsigned int r_symbolnum:24, /* local symbol ordinal */ | |
| 41 | r_pcrel:1, /* was relocated pc relative already */ | |
| 42 | r_length:2, /* 0=byte, 1=word, 2=long */ | |
| 43 | r_extern:1, /* does not include value of sym referenced */ | |
| 44 | :4; /* nothing, yet */ | |
| 45 | }; | |
| 46 | ||
| 47 | /* | |
| 48 | * Format of a symbol table entry; this file is included by <a.out.h> | |
| 49 | * and should be used if you aren't interested the a.out header | |
| 50 | * or relocation information. | |
| 51 | */ | |
| 52 | struct nlist { | |
| 53 | union { | |
| 54 | char *n_name; /* for use when in-core */ | |
| 55 | long n_strx; /* index into file string table */ | |
| 56 | } n_un; | |
| 57 | unsigned char n_type; /* type flag, i.e. N_TEXT etc; see below */ | |
| 58 | char n_other; /* unused */ | |
| 59 | short n_desc; /* see <stab.h> */ | |
| 60 | unsigned long n_value; /* value of this symbol (or sdb offset) */ | |
| 61 | }; | |
| 62 | #define n_hash n_desc /* used internally by ld */ | |
| 63 | ||
| 64 | /* | |
| 65 | * Simple values for n_type. | |
| 66 | */ | |
| 67 | #define N_UNDF 0x0 /* undefined */ | |
| 68 | #define N_ABS 0x2 /* absolute */ | |
| 69 | #define N_TEXT 0x4 /* text */ | |
| 70 | #define N_DATA 0x6 /* data */ | |
| 71 | #define N_BSS 0x8 /* bss */ | |
| 72 | #define N_COMM 0x12 /* common (internal to ld) */ | |
| 73 | #define N_FN 0x1f /* file name symbol */ | |
| 74 | ||
| 75 | #define N_EXT 01 /* external bit, or'ed in */ | |
| 76 | #define N_TYPE 0x1e /* mask for all the type bits */ | |
| 77 | ||
| 78 | /* | |
| 79 | * Sdb entries have some of the N_STAB bits set. | |
| 80 | * These are given in <stab.h> | |
| 81 | */ | |
| 82 | #define N_STAB 0xe0 /* if any of these bits set, a SDB entry */ | |
| 83 | ||
| 84 | /* | |
| 85 | * Format for namelist values. | |
| 86 | */ | |
| 87 | #define N_FORMAT "%08x" |