projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 4b5fb9f4 KB |
1 | /*- |
| 2 | * Copyright (c) 1992 The Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * %sccs.include.redist.c% | |
| 6 | * | |
| 7 | * @(#)exec.h 7.1 (Berkeley) %G% | |
| 8 | */ | |
| 9 | ||
| 10 | /* Size of a page in an object file. */ | |
| 11 | #define __LDPGSZ 4096 | |
| 12 | ||
| 13 | /* Valid magic number check. */ | |
| 14 | #define N_BADMAG(ex) \ | |
| 15 | ((ex).a_magic != NMAGIC && (ex).a_magic != OMAGIC && \ | |
| 16 | (ex).a_magic != ZMAGIC) | |
| 17 | ||
| 18 | /* Address of the bottom of the text segment. */ | |
| 19 | #define N_TXTADDR(X) 0 | |
| 20 | ||
| 21 | /* Address of the bottom of the data segment. */ | |
| 22 | #define N_DATADDR(ex) \ | |
| 23 | (N_TXTADDR(ex) + ((ex).a_magic == OMAGIC ? (ex).a_text \ | |
| 24 | : __LDPGSZ + ((ex).a_text - 1 & ~(__LDPGSZ - 1)))) | |
| 25 | ||
| 26 | /* Text segment offset. */ | |
| 27 | #define N_TXTOFF(ex) \ | |
| 28 | ((ex).a_magic == ZMAGIC ? __LDPGSZ : sizeof(struct exec)) | |
| 29 | ||
| 30 | /* Data segment offset. */ | |
| 31 | #define N_DATOFF(ex) \ | |
| 32 | (N_TXTOFF(ex) + ((ex).a_magic != ZMAGIC ? (ex).a_text : \ | |
| 33 | __LDPGSZ + ((ex).a_text - 1 & ~(__LDPGSZ - 1)))) | |
| 34 | ||
| 35 | /* Symbol table offset. */ | |
| 36 | #define N_SYMOFF(ex) \ | |
| 37 | (N_TXTOFF(ex) + (ex).a_text + (ex).a_data + (ex).a_trsize + \ | |
| 38 | (ex).a_drsize) | |
| 39 | ||
| 40 | /* String table offset. */ | |
| 41 | #define N_STROFF(ex) (N_SYMOFF(ex) + (ex).a_syms) | |
| 42 | ||
| 43 | /* Description of the object file header (a.out format). */ | |
| 44 | struct exec { | |
| 45 | #define OMAGIC 0407 /* old impure format */ | |
| 46 | #define NMAGIC 0410 /* read-only text */ | |
| 47 | #define ZMAGIC 0413 /* demand load format */ | |
| 48 | long a_magic; /* magic number */ | |
| 49 | ||
| 50 | u_long a_text; /* text segment size */ | |
| 51 | u_long a_data; /* initialized data size */ | |
| 52 | u_long a_bss; /* uninitialized data size */ | |
| 53 | u_long a_syms; /* symbol table size */ | |
| 54 | u_long a_entry; /* entry point */ | |
| 55 | u_long a_trsize; /* text relocation size */ | |
| 56 | u_long a_drsize; /* data relocation size */ | |
| 57 | }; |