1 /* 2 * Copyright (c) 1992 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This software was developed by the Computer Systems Engineering group 6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 7 * contributed to Berkeley. 8 * 9 * %sccs.include.redist.c% 10 * 11 * @(#)exec.h 7.1 (Berkeley) 07/13/92 12 * 13 * from: $Header: exec.h,v 1.7 92/07/01 23:51:32 torek Exp $ 14 */ 15 16 /* 17 * __LDPGSZ is the page size used by the linker and by exec(). 18 * It may be some multiple of the ``normal'' page size, so that, e.g., 19 * the same binaries can be run on hardware with different page sizes 20 * that otherwise use the same instruction set. It must be no larger 21 * than CLBYTES (in param.h). 22 */ 23 #define __LDPGSZ 8192 24 25 /* Valid magic number check. */ 26 #define N_BADMAG(ex) \ 27 ((ex).a_magic != ZMAGIC && (ex).a_magic != NMAGIC && \ 28 (ex).a_magic != OMAGIC) 29 30 /* 31 * N_TXTADDR is the address of the first executable instruction: that is, 32 * the place the pc could begin after an a.out is loaded, in order to run 33 * the instructions in that a.out. The pc will actually be set to ex.a_entry 34 * but this is the first place it could possibly reference. 35 * 36 * On the SPARC, binaries begin at __LDPGSZ, i.e., page 1. 37 */ 38 #define N_TXTADDR(ex) 8192 39 40 /* Address of the bottom of the data segment. */ 41 #define N_DATADDR(ex) \ 42 (N_TXTADDR(ex) + ((ex).a_magic == OMAGIC ? (ex).a_text \ 43 : __LDPGSZ + ((ex).a_text - 1 & ~(__LDPGSZ - 1)))) 44 45 /* 46 * N_TXTOFF is the offset within an a.out file of the first executable 47 * instruction: that is, the offset in the a.out of the byte that winds 48 * up at N_TXTADDR. 49 * 50 * On the SPARC, the a.out header is included in the executable when running 51 * a ZMAGIC file (but not for OMAGIC and NMAGIC). 52 */ 53 #define N_TXTOFF(ex) ((ex).a_magic == ZMAGIC ? 0 : sizeof(struct exec)) 54 55 /* Data segment offset. */ 56 #define N_DATOFF(ex) \ 57 (N_TXTOFF(ex) + ((ex).a_magic != ZMAGIC ? (ex).a_text : \ 58 __LDPGSZ + ((ex).a_text - 1 & ~(__LDPGSZ - 1)))) 59 60 /* Symbol table offset. */ 61 #define N_SYMOFF(ex) \ 62 (N_TXTOFF(ex) + (ex).a_text + (ex).a_data + (ex).a_trsize + \ 63 (ex).a_drsize) 64 65 /* String table offset. */ 66 #define N_STROFF(ex) (N_SYMOFF(ex) + (ex).a_syms) 67 68 /* Description of the object file header (a.out format). */ 69 struct exec { 70 u_char a_dynamic:1; /* dynamically linked */ 71 u_char a_toolversion:7;/* Sun toolset version XXX */ 72 73 #define MID_ZERO 0 /* unknown - implementation dependent */ 74 #define MID_SUN010 1 /* sun 68010/68020 binary */ 75 #define MID_SUN020 2 /* sun 68020-only binary */ 76 #define MID_SUN_SPARC 3 /* sparc binary */ 77 #define MID_HP200 200 /* hp200 (68010) BSD binary */ 78 #define MID_HP300 300 /* hp300 (68020+68881) BSD binary */ 79 #define MID_HPUX 0x20C /* hp200/300 HP-UX binary */ 80 #define MID_HPUX800 0x20B /* hp800 HP-UX binary */ 81 u_char a_mid; /* machine ID */ 82 83 #define OMAGIC 0407 /* old impure format */ 84 #define NMAGIC 0410 /* read-only text */ 85 #define ZMAGIC 0413 /* demand load format */ 86 u_short a_magic; /* magic number */ 87 88 u_long a_text; /* text segment size */ 89 u_long a_data; /* initialized data size */ 90 u_long a_bss; /* uninitialized data size */ 91 u_long a_syms; /* symbol table size */ 92 u_long a_entry; /* entry point */ 93 u_long a_trsize; /* text relocation size */ 94 u_long a_drsize; /* data relocation size */ 95 }; 96 #define a_machtype a_mid /* SUN compatibility */ 97