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Annotation of XNU/bsd/i386/exec.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*-
        !            23:  * Copyright (c) 1992, 1993
        !            24:  *     The Regents of the University of California.  All rights reserved.
        !            25:  *
        !            26:  * Redistribution and use in source and binary forms, with or without
        !            27:  * modification, are permitted provided that the following conditions
        !            28:  * are met:
        !            29:  * 1. Redistributions of source code must retain the above copyright
        !            30:  *    notice, this list of conditions and the following disclaimer.
        !            31:  * 2. Redistributions in binary form must reproduce the above copyright
        !            32:  *    notice, this list of conditions and the following disclaimer in the
        !            33:  *    documentation and/or other materials provided with the distribution.
        !            34:  * 3. All advertising materials mentioning features or use of this software
        !            35:  *    must display the following acknowledgement:
        !            36:  *     This product includes software developed by the University of
        !            37:  *     California, Berkeley and its contributors.
        !            38:  * 4. Neither the name of the University nor the names of its contributors
        !            39:  *    may be used to endorse or promote products derived from this software
        !            40:  *    without specific prior written permission.
        !            41:  *
        !            42:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            43:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            44:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            45:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            46:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            47:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            48:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            49:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            50:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            51:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            52:  * SUCH DAMAGE.
        !            53:  *
        !            54:  *     @(#)exec.h      8.1 (Berkeley) 6/11/93
        !            55:  */
        !            56: 
        !            57: /* Size of a page in an object file. */
        !            58: #define        __LDPGSZ        4096
        !            59: 
        !            60: /* Valid magic number check. */
        !            61: #define        N_BADMAG(ex) \
        !            62:        ((ex).a_magic != NMAGIC && (ex).a_magic != OMAGIC && \
        !            63:            (ex).a_magic != ZMAGIC)
        !            64: 
        !            65: /* Address of the bottom of the text segment. */
        !            66: #define N_TXTADDR(X)   0
        !            67: 
        !            68: /* Address of the bottom of the data segment. */
        !            69: #define N_DATADDR(ex) \
        !            70:        (N_TXTADDR(ex) + ((ex).a_magic == OMAGIC ? (ex).a_text \
        !            71:        : __LDPGSZ + ((ex).a_text - 1 & ~(__LDPGSZ - 1))))
        !            72: 
        !            73: /* Text segment offset. */
        !            74: #define        N_TXTOFF(ex) \
        !            75:        ((ex).a_magic == ZMAGIC ? __LDPGSZ : sizeof(struct exec))
        !            76: 
        !            77: /* Data segment offset. */
        !            78: #define        N_DATOFF(ex) \
        !            79:        (N_TXTOFF(ex) + ((ex).a_magic != ZMAGIC ? (ex).a_text : \
        !            80:        __LDPGSZ + ((ex).a_text - 1 & ~(__LDPGSZ - 1))))
        !            81: 
        !            82: /* Symbol table offset. */
        !            83: #define N_SYMOFF(ex) \
        !            84:        (N_TXTOFF(ex) + (ex).a_text + (ex).a_data + (ex).a_trsize + \
        !            85:            (ex).a_drsize)
        !            86: 
        !            87: /* String table offset. */
        !            88: #define        N_STROFF(ex)    (N_SYMOFF(ex) + (ex).a_syms)
        !            89: 
        !            90: /* Description of the object file header (a.out format). */
        !            91: struct exec {
        !            92: #define        OMAGIC  0407            /* old impure format */
        !            93: #define        NMAGIC  0410            /* read-only text */
        !            94: #define        ZMAGIC  0413            /* demand load format */
        !            95: #define QMAGIC 0314            /* demand load format. Header in text. */
        !            96:        unsigned int    a_magic;        /* magic number */
        !            97: 
        !            98:        unsigned int    a_text;         /* text segment size */
        !            99:        unsigned int    a_data;         /* initialized data size */
        !           100:        unsigned int    a_bss;          /* uninitialized data size */
        !           101:        unsigned int    a_syms;         /* symbol table size */
        !           102:        unsigned int    a_entry;        /* entry point */
        !           103:        unsigned int    a_trsize;       /* text relocation size */
        !           104:        unsigned int    a_drsize;       /* data relocation size */
        !           105: };
        !           106: 
        !           107: /*
        !           108:  * Address of ps_strings structure (in user space).
        !           109:  */
        !           110: #define        PS_STRINGS \
        !           111:        ((struct ps_strings *)(USRSTACK - sizeof(struct ps_strings)))

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