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) 03/18/92 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 }; 58