1 /*- 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)exec.h 8.1 (Berkeley) 6/11/93 34 */ 35 36 #ifndef _EXEC_H_ 37 #define _EXEC_H_ 38 39 #define __LDPGSZ 4096 40 41 /* Valid magic number check. */ 42 #define N_BADMAG(ex) \ 43 (N_GETMAGIC(ex) != OMAGIC && N_GETMAGIC(ex) != NMAGIC && \ 44 N_GETMAGIC(ex) != ZMAGIC && N_GETMAGIC(ex) != QMAGIC && \ 45 N_GETMAGIC_NET(ex) != OMAGIC && N_GETMAGIC_NET(ex) != NMAGIC && \ 46 N_GETMAGIC_NET(ex) != ZMAGIC && N_GETMAGIC_NET(ex) != QMAGIC) 47 48 #define N_ALIGN(ex,x) \ 49 (N_GETMAGIC(ex) == ZMAGIC || N_GETMAGIC(ex) == QMAGIC || \ 50 N_GETMAGIC_NET(ex) == ZMAGIC || N_GETMAGIC_NET(ex) == QMAGIC ? \ 51 ((x) + __LDPGSZ - 1) & ~(__LDPGSZ - 1) : (x)) 52 53 /* Address of the bottom of the text segment. */ 54 #define N_TXTADDR(ex) \ 55 ((N_GETMAGIC(ex) == OMAGIC || N_GETMAGIC(ex) == NMAGIC || \ 56 N_GETMAGIC(ex) == ZMAGIC) ? 0 : __LDPGSZ) 57 58 /* Address of the bottom of the data segment. */ 59 #define N_DATADDR(ex) \ 60 N_ALIGN(ex, N_TXTADDR(ex) + (ex).a_text) 61 62 #define N_GETMAGIC(ex) \ 63 ( (ex).a_midmag & 0xffff ) 64 #define N_GETMID(ex) \ 65 ( (N_GETMAGIC_NET(ex) == ZMAGIC) ? N_GETMID_NET(ex) : \ 66 ((ex).a_midmag >> 16) & 0x03ff ) 67 #define N_GETFLAG(ex) \ 68 ( (N_GETMAGIC_NET(ex) == ZMAGIC) ? N_GETFLAG_NET(ex) : \ 69 ((ex).a_midmag >> 26) & 0x3f ) 70 #define N_SETMAGIC(ex,mag,mid,flag) \ 71 ( (ex).a_midmag = (((flag) & 0x3f) <<26) | (((mid) & 0x03ff) << 16) | \ 72 ((mag) & 0xffff) ) 73 74 #define N_GETMAGIC_NET(ex) \ 75 (ntohl((ex).a_midmag) & 0xffff) 76 #define N_GETMID_NET(ex) \ 77 ((ntohl((ex).a_midmag) >> 16) & 0x03ff) 78 #define N_GETFLAG_NET(ex) \ 79 ((ntohl((ex).a_midmag) >> 26) & 0x3f) 80 #define N_SETMAGIC_NET(ex,mag,mid,flag) \ 81 ( (ex).a_midmag = htonl( (((flag)&0x3f)<<26) | (((mid)&0x03ff)<<16) | \ 82 (((mag)&0xffff)) ) ) 83 84 /* Text segment offset. */ 85 #define N_TXTOFF(ex) \ 86 (N_GETMAGIC(ex) == ZMAGIC ? __LDPGSZ : (N_GETMAGIC(ex) == QMAGIC || \ 87 N_GETMAGIC_NET(ex) == ZMAGIC) ? 0 : sizeof(struct exec)) 88 89 /* Data segment offset. */ 90 #define N_DATOFF(ex) \ 91 N_ALIGN(ex, N_TXTOFF(ex) + (ex).a_text) 92 93 /* Relocation table offset. */ 94 #define N_RELOFF(ex) \ 95 N_ALIGN(ex, N_DATOFF(ex) + (ex).a_data) 96 97 /* Symbol table offset. */ 98 #define N_SYMOFF(ex) \ 99 (N_RELOFF(ex) + (ex).a_trsize + (ex).a_drsize) 100 101 /* String table offset. */ 102 #define N_STROFF(ex) (N_SYMOFF(ex) + (ex).a_syms) 103 104 /* 105 * Header prepended to each a.out file. 106 * only manipulate the a_midmag field via the 107 * N_SETMAGIC/N_GET{MAGIC,MID,FLAG} macros in a.out.h 108 */ 109 110 struct exec { 111 unsigned long a_midmag; /* htonl(flags<<26 | mid<<16 | magic) */ 112 unsigned long a_text; /* text segment size */ 113 unsigned long a_data; /* initialized data size */ 114 unsigned long a_bss; /* uninitialized data size */ 115 unsigned long a_syms; /* symbol table size */ 116 unsigned long a_entry; /* entry point */ 117 unsigned long a_trsize; /* text relocation size */ 118 unsigned long a_drsize; /* data relocation size */ 119 }; 120 #define a_magic a_midmag /* XXX Hack to work with current kern_execve.c */ 121 122 /* a_magic */ 123 #define OMAGIC 0407 /* old impure format */ 124 #define NMAGIC 0410 /* read-only text */ 125 #define ZMAGIC 0413 /* demand load format */ 126 #define QMAGIC 0314 /* "compact" demand load format */ 127 128 #endif /* !_EXEC_H_ */ 129