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Annotation of kernel/bsd/ppc/exec.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* 
        !            26:  * Copyright (c) 1994, The University of Utah and
        !            27:  * the Center for Software Science at the University of Utah (CSS).
        !            28:  * All rights reserved.
        !            29:  *
        !            30:  * Permission to use, copy, modify and distribute this software and its
        !            31:  * documentation is hereby granted, provided that both the copyright
        !            32:  * notice and this permission notice appear in all copies of the
        !            33:  * software, derivative works or modified versions, and any portions
        !            34:  * thereof, and that both notices appear in supporting documentation.
        !            35:  *
        !            36:  * THE UNIVERSITY OF UTAH AND CSS ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
        !            37:  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSS DISCLAIM ANY LIABILITY OF
        !            38:  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            39:  *
        !            40:  * CSS requests users of this software to return to [email protected] any
        !            41:  * improvements that they make and grant CSS redistribution rights.
        !            42:  *
        !            43:  */
        !            44: 
        !            45: /* Size of a page in an object file. */
        !            46: #define        __LDPGSZ        4096
        !            47: 
        !            48: /* Valid magic number check. */
        !            49: #define        N_BADMAG(ex) \
        !            50:        ((ex).a_magic != NMAGIC && (ex).a_magic != OMAGIC && \
        !            51:            (ex).a_magic != ZMAGIC)
        !            52: 
        !            53: /* Address of the bottom of the text segment. */
        !            54: #define N_TXTADDR(X)   0
        !            55: 
        !            56: /* Address of the bottom of the data segment. */
        !            57: #define N_DATADDR(ex) \
        !            58:        (N_TXTADDR(ex) + ((ex).a_magic == OMAGIC ? (ex).a_text \
        !            59:        : __LDPGSZ + ((ex).a_text - 1 & ~(__LDPGSZ - 1))))
        !            60: 
        !            61: /* Text segment offset. */
        !            62: #define        N_TXTOFF(ex) \
        !            63:        ((ex).a_magic == ZMAGIC ? __LDPGSZ : sizeof(struct exec))
        !            64: 
        !            65: /* Data segment offset. */
        !            66: #define        N_DATOFF(ex) \
        !            67:        (N_TXTOFF(ex) + ((ex).a_magic != ZMAGIC ? (ex).a_text : \
        !            68:        __LDPGSZ + ((ex).a_text - 1 & ~(__LDPGSZ - 1))))
        !            69: 
        !            70: /* Symbol table offset. */
        !            71: #define N_SYMOFF(ex) \
        !            72:        (N_TXTOFF(ex) + (ex).a_text + (ex).a_data + (ex).a_trsize + \
        !            73:            (ex).a_drsize)
        !            74: 
        !            75: /* String table offset. */
        !            76: #define        N_STROFF(ex)    (N_SYMOFF(ex) + (ex).a_syms)
        !            77: 
        !            78: /* Description of the object file header (a.out format). */
        !            79: struct exec {
        !            80: #define        OMAGIC  0407            /* old impure format */
        !            81: #define        NMAGIC  0410            /* read-only text */
        !            82: #define        ZMAGIC  0413            /* demand load format */
        !            83: #define QMAGIC 0314            /* demand load format. Header in text. */
        !            84:        unsigned int    a_magic;        /* magic number */
        !            85: 
        !            86:        unsigned int    a_text;         /* text segment size */
        !            87:        unsigned int    a_data;         /* initialized data size */
        !            88:        unsigned int    a_bss;          /* uninitialized data size */
        !            89:        unsigned int    a_syms;         /* symbol table size */
        !            90:        unsigned int    a_entry;        /* entry point */
        !            91:        unsigned int    a_trsize;       /* text relocation size */
        !            92:        unsigned int    a_drsize;       /* data relocation size */
        !            93: };
        !            94: 
        !            95: /*
        !            96:  * Address of ps_strings structure (in user space).
        !            97:  */
        !            98: #define        PS_STRINGS \
        !            99:        ((struct ps_strings *)(USRSTACK - sizeof(struct ps_strings)))
        !           100: 

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