bsd/ppc/exec.h

   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) 1994, The University of Utah and
  24  * the Center for Software Science at the University of Utah (CSS).
  25  * All rights reserved.
  26  *
  27  * Permission to use, copy, modify and distribute this software and its
  28  * documentation is hereby granted, provided that both the copyright
  29  * notice and this permission notice appear in all copies of the
  30  * software, derivative works or modified versions, and any portions
  31  * thereof, and that both notices appear in supporting documentation.
  32  *
  33  * THE UNIVERSITY OF UTAH AND CSS ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
  34  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSS DISCLAIM ANY LIABILITY OF
  35  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  36  *
  37  * CSS requests users of this software to return to css-dist@cs.utah.edu any
  38  * improvements that they make and grant CSS redistribution rights.
  39  *
  40  */
  41
  42 /* Size of a page in an object file. */
  43 #define __LDPGSZ        4096
  44
  45 /* Valid magic number check. */
  46 #define N_BADMAG(ex) \
  47         ((ex).a_magic != NMAGIC && (ex).a_magic != OMAGIC && \
  48             (ex).a_magic != ZMAGIC)
  49
  50 /* Address of the bottom of the text segment. */
  51 #define N_TXTADDR(X)    0
  52
  53 /* Address of the bottom of the data segment. */
  54 #define N_DATADDR(ex) \
  55         (N_TXTADDR(ex) + ((ex).a_magic == OMAGIC ? (ex).a_text \
  56         : __LDPGSZ + ((ex).a_text - 1 & ~(__LDPGSZ - 1))))
  57
  58 /* Text segment offset. */
  59 #define N_TXTOFF(ex) \
  60         ((ex).a_magic == ZMAGIC ? __LDPGSZ : sizeof(struct exec))
  61
  62 /* Data segment offset. */
  63 #define N_DATOFF(ex) \
  64         (N_TXTOFF(ex) + ((ex).a_magic != ZMAGIC ? (ex).a_text : \
  65         __LDPGSZ + ((ex).a_text - 1 & ~(__LDPGSZ - 1))))
  66
  67 /* Symbol table offset. */
  68 #define N_SYMOFF(ex) \
  69         (N_TXTOFF(ex) + (ex).a_text + (ex).a_data + (ex).a_trsize + \
  70             (ex).a_drsize)
  71
  72 /* String table offset. */
  73 #define N_STROFF(ex)    (N_SYMOFF(ex) + (ex).a_syms)
  74
  75 /* Description of the object file header (a.out format). */
  76 struct exec {
  77 #define OMAGIC  0407            /* old impure format */
  78 #define NMAGIC  0410            /* read-only text */
  79 #define ZMAGIC  0413            /* demand load format */
  80 #define QMAGIC  0314            /* demand load format. Header in text. */
  81         unsigned int    a_magic;        /* magic number */
  82
  83         unsigned int    a_text;         /* text segment size */
  84         unsigned int    a_data;         /* initialized data size */
  85         unsigned int    a_bss;          /* uninitialized data size */
  86         unsigned int    a_syms;         /* symbol table size */
  87         unsigned int    a_entry;        /* entry point */
  88         unsigned int    a_trsize;       /* text relocation size */
  89         unsigned int    a_drsize;       /* data relocation size */
  90 };
  91
  92 /*
  93  * Address of ps_strings structure (in user space).
  94  */
  95 #define PS_STRINGS \
  96         ((struct ps_strings *)(USRSTACK - sizeof(struct ps_strings)))
  97