gas/config/obj-aout.h

   1 /* a.out object file format
   2    Copyright (C) 1989, 1990, 1991 Free Software Foundation, Inc.
   3
   4 This file is part of GAS, the GNU Assembler.
   5
   6 GAS is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as
   8 published by the Free Software Foundation; either version 1,
   9 or (at your option) any later version.
  10
  11 GAS is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  14 the GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public
  17 License along with GAS; see the file COPYING.  If not, write
  18 to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
  19
  20 /* $Id$ */
  21
  22 /* Tag to validate a.out object file format processing */
  23 #define OBJ_AOUT 1
  24
  25 #include "targ-cpu.h"
  26
  27 #ifndef         VMS
  28 #include "a.out.gnu.h"          /* Needed to define struct nlist. Sigh. */
  29 #else
  30 #include "a_out.h"
  31 #endif
  32
  33 extern const short seg_N_TYPE[];
  34 extern const segT  N_TYPE_seg[];
  35
  36 #ifndef DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE
  37 #define DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE    (OMAGIC)
  38 #endif /* DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE */
  39
  40 /* SYMBOL TABLE */
  41 /* Symbol table entry data type */
  42
  43 typedef struct nlist obj_symbol_type; /* Symbol table entry */
  44
  45 /* If compiler generate leading underscores, remove them. */
  46
  47 #ifndef STRIP_UNDERSCORE
  48 #define STRIP_UNDERSCORE 0
  49 #endif /* STRIP_UNDERSCORE */
  50
  51 /* Symbol table macros and constants */
  52
  53 /*
  54  *  Macros to extract information from a symbol table entry.
  55  *  This syntaxic indirection allows independence regarding a.out or coff.
  56  *  The argument (s) of all these macros is a pointer to a symbol table entry.
  57  */
  58
  59 /* True if the symbol is external */
  60 #define S_IS_EXTERNAL(s)        ((s)->sy_symbol.n_type & N_EXT)
  61
  62 /* True if symbol has been defined, ie is in N_{TEXT,DATA,BSS,ABS} or N_EXT */
  63 #define S_IS_DEFINED(s)         ((S_GET_TYPE(s) != N_UNDF) || (S_GET_OTHER(s) != 0) || (S_GET_DESC(s) != 0))
  64
  65 #define S_IS_REGISTER(s)        ((s)->sy_symbol.n_type == N_REGISTER)
  66
  67 /* True if a debug special symbol entry */
  68 #define S_IS_DEBUG(s)           ((s)->sy_symbol.n_type & N_STAB)
  69 /* True if a symbol is local symbol name */
  70 /* A symbol name whose name begin with ^A is a gas internal pseudo symbol
  71    nameless symbols come from .stab directives. */
  72 #define S_IS_LOCAL(s)           (S_GET_NAME(s) && \
  73                                  !S_IS_DEBUG(s) && \
  74                                  (S_GET_NAME(s)[0] == '\001' || \
  75                                   (S_LOCAL_NAME(s) && !flagseen['L'])))
  76 /* True if a symbol is not defined in this file */
  77 #define S_IS_EXTERN(s)          ((s)->sy_symbol.n_type & N_EXT)
  78 /* True if the symbol has been generated because of a .stabd directive */
  79 #define S_IS_STABD(s)           (S_GET_NAME(s) == (char *)0)
  80
  81 /* Accessors */
  82 /* The value of the symbol */
  83 #define S_GET_VALUE(s)          (((s)->sy_symbol.n_value))
  84 /* The name of the symbol */
  85 #define S_GET_NAME(s)           ((s)->sy_symbol.n_un.n_name)
  86 /* The pointer to the string table */
  87 #define S_GET_OFFSET(s)         ((s)->sy_symbol.n_un.n_strx)
  88 /* The type of the symbol */
  89 #define S_GET_TYPE(s)           ((s)->sy_symbol.n_type & N_TYPE)
  90 /* The numeric value of the segment */
  91 #define S_GET_SEGMENT(s)        (N_TYPE_seg[S_GET_TYPE(s)])
  92 /* The n_other expression value */
  93 #define S_GET_OTHER(s)          ((s)->sy_symbol.n_other)
  94 /* The n_desc expression value */
  95 #define S_GET_DESC(s)           ((s)->sy_symbol.n_desc)
  96
  97 /* Modifiers */
  98 /* Set the value of the symbol */
  99 #define S_SET_VALUE(s,v)        ((s)->sy_symbol.n_value = (unsigned long) (v))
 100 /* Assume that a symbol cannot be simultaneously in more than on segment */
 101  /* set segment */
 102 #define S_SET_SEGMENT(s,seg)    ((s)->sy_symbol.n_type &= ~N_TYPE,(s)->sy_symbol.n_type|=SEGMENT_TO_SYMBOL_TYPE(seg))
 103 /* The symbol is external */
 104 #define S_SET_EXTERNAL(s)       ((s)->sy_symbol.n_type |= N_EXT)
 105 /* The symbol is not external */
 106 #define S_CLEAR_EXTERNAL(s)     ((s)->sy_symbol.n_type &= ~N_EXT)
 107 /* Set the name of the symbol */
 108 #define S_SET_NAME(s,v)         ((s)->sy_symbol.n_un.n_name = (v))
 109 /* Set the offset in the string table */
 110 #define S_SET_OFFSET(s,v)       ((s)->sy_symbol.n_un.n_strx = (v))
 111 /* Set the n_other expression value */
 112 #define S_SET_OTHER(s,v)        ((s)->sy_symbol.n_other = (v))
 113 /* Set the n_desc expression value */
 114 #define S_SET_DESC(s,v)         ((s)->sy_symbol.n_desc = (v))
 115
 116 /* File header macro and type definition */
 117
 118 #define H_GET_FILE_SIZE(h)      (sizeof(struct exec) + \
 119                                  H_GET_TEXT_SIZE(h) + H_GET_DATA_SIZE(h) + \
 120                                  H_GET_SYMBOL_TABLE_SIZE(h) + \
 121                                  H_GET_TEXT_RELOCATION_SIZE(h) + \
 122                                  H_GET_DATA_RELOCATION_SIZE(h) + \
 123                                  (h)->string_table_size)
 124
 125 #define H_GET_TEXT_SIZE(h)              ((h)->header.a_text)
 126 #define H_GET_DATA_SIZE(h)              ((h)->header.a_data)
 127 #define H_GET_BSS_SIZE(h)               ((h)->header.a_bss)
 128 #define H_GET_TEXT_RELOCATION_SIZE(h)   ((h)->header.a_trsize)
 129 #define H_GET_DATA_RELOCATION_SIZE(h)   ((h)->header.a_drsize)
 130 #define H_GET_SYMBOL_TABLE_SIZE(h)      ((h)->header.a_syms)
 131 #define H_GET_MAGIC_NUMBER(h)           ((h)->header.a_info)
 132 #define H_GET_ENTRY_POINT(h)            ((h)->header.a_entry)
 133 #define H_GET_STRING_SIZE(h)            ((h)->string_table_size)
 134 #ifdef EXEC_MACHINE_TYPE
 135 #define H_GET_MACHINE_TYPE(h)           ((h)->header.a_machtype)
 136 #endif /* EXEC_MACHINE_TYPE */
 137 #ifdef EXEC_VERSION
 138 #define H_GET_VERSION(h)                ((h)->header.a_version)
 139 #endif /* EXEC_VERSION */
 140
 141 #define H_SET_TEXT_SIZE(h,v)            ((h)->header.a_text = md_section_align(SEG_TEXT, (v)))
 142 #define H_SET_DATA_SIZE(h,v)            ((h)->header.a_data = md_section_align(SEG_DATA, (v)))
 143 #define H_SET_BSS_SIZE(h,v)             ((h)->header.a_bss = md_section_align(SEG_BSS, (v)))
 144
 145 #define H_SET_RELOCATION_SIZE(h,t,d)    (H_SET_TEXT_RELOCATION_SIZE((h),(t)),\
 146                                          H_SET_DATA_RELOCATION_SIZE((h),(d)))
 147
 148 #define H_SET_TEXT_RELOCATION_SIZE(h,v) ((h)->header.a_trsize = (v))
 149 #define H_SET_DATA_RELOCATION_SIZE(h,v) ((h)->header.a_drsize = (v))
 150 #define H_SET_SYMBOL_TABLE_SIZE(h,v)    ((h)->header.a_syms = (v) * \
 151                                          sizeof(struct nlist))
 152
 153 #define H_SET_MAGIC_NUMBER(h,v)         ((h)->header.a_info = (v))
 154
 155 #define H_SET_ENTRY_POINT(h,v)          ((h)->header.a_entry = (v))
 156 #define H_SET_STRING_SIZE(h,v)          ((h)->string_table_size = (v))
 157 #ifdef EXEC_MACHINE_TYPE
 158 #define H_SET_MACHINE_TYPE(h,v)         ((h)->header.a_machtype = (v))
 159 #endif /* EXEC_MACHINE_TYPE */
 160 #ifdef EXEC_VERSION
 161 #define H_SET_VERSION(h,v)              ((h)->header.a_version = (v))
 162 #endif /* EXEC_VERSION */
 163
 164 /*
 165  * Current means for getting the name of a segment.
 166  * This will change for infinite-segments support (e.g. COFF).
 167  */
 168 #define segment_name(seg)  ( seg_name[(int)(seg)] )
 169 extern char *const seg_name[];
 170
 171 typedef struct {
 172     struct exec header;                 /* a.out header */
 173     long        string_table_size;      /* names + '\0' + sizeof(int) */
 174 } object_headers;
 175
 176 /* line numbering stuff. */
 177 #define OBJ_EMIT_LINENO(a, b, c)        ;
 178 #define obj_pre_write_hook(a)           ;
 179
 180 /*
 181  * Local Variables:
 182  * comment-column: 0
 183  * fill-column: 131
 184  * End:
 185  */
 186
 187 /* end of obj-aout.h */