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 2,
   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 #ifndef AOUT_MACHTYPE
  34 #define AOUT_MACHTYPE 0
  35 #endif /* AOUT_MACHTYPE */
  36
  37 extern const short seg_N_TYPE[];
  38 extern const segT  N_TYPE_seg[];
  39
  40 #ifndef DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE
  41 #define DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE    (OMAGIC)
  42 #endif /* DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE */
  43
  44 /* SYMBOL TABLE */
  45 /* Symbol table entry data type */
  46
  47 typedef struct nlist obj_symbol_type; /* Symbol table entry */
  48
  49 /* Symbol table macros and constants */
  50
  51 /*
  52  *  Macros to extract information from a symbol table entry.
  53  *  This syntaxic indirection allows independence regarding a.out or coff.
  54  *  The argument (s) of all these macros is a pointer to a symbol table entry.
  55  */
  56
  57 /* True if the symbol is external */
  58 #define S_IS_EXTERNAL(s)        ((s)->sy_symbol.n_type & N_EXT)
  59
  60 /* True if symbol has been defined, ie is in N_{TEXT,DATA,BSS,ABS} or N_EXT */
  61 #define S_IS_DEFINED(s)         ((S_GET_TYPE(s) != N_UNDF) || (S_GET_OTHER(s) != 0) || (S_GET_DESC(s) != 0))
  62
  63 #define S_IS_REGISTER(s)        ((s)->sy_symbol.n_type == N_REGISTER)
  64
  65 /* True if a debug special symbol entry */
  66 #define S_IS_DEBUG(s)           ((s)->sy_symbol.n_type & N_STAB)
  67 /* True if a symbol is local symbol name */
  68 /* A symbol name whose name begin with ^A is a gas internal pseudo symbol
  69    nameless symbols come from .stab directives. */
  70 #define S_IS_LOCAL(s)           (S_GET_NAME(s) && \
  71                                  !S_IS_DEBUG(s) && \
  72                                  (S_GET_NAME(s)[0] == '\001' || \
  73                                   (S_LOCAL_NAME(s) && !flagseen['L'])))
  74 /* True if a symbol is not defined in this file */
  75 #define S_IS_EXTERN(s)          ((s)->sy_symbol.n_type & N_EXT)
  76 /* True if the symbol has been generated because of a .stabd directive */
  77 #define S_IS_STABD(s)           (S_GET_NAME(s) == (char *)0)
  78
  79 /* Accessors */
  80 /* The value of the symbol */
  81 #define S_GET_VALUE(s)          (((s)->sy_symbol.n_value))
  82 /* The name of the symbol */
  83 #define S_GET_NAME(s)           ((s)->sy_symbol.n_un.n_name)
  84 /* The pointer to the string table */
  85 #define S_GET_OFFSET(s)         ((s)->sy_symbol.n_un.n_strx)
  86 /* The type of the symbol */
  87 #define S_GET_TYPE(s)           ((s)->sy_symbol.n_type & N_TYPE)
  88 /* The numeric value of the segment */
  89 #define S_GET_SEGMENT(s)        (N_TYPE_seg[S_GET_TYPE(s)])
  90 /* The n_other expression value */
  91 #define S_GET_OTHER(s)          ((s)->sy_symbol.n_other)
  92 /* The n_desc expression value */
  93 #define S_GET_DESC(s)           ((s)->sy_symbol.n_desc)
  94
  95 /* Modifiers */
  96 /* Set the value of the symbol */
  97 #define S_SET_VALUE(s,v)        ((s)->sy_symbol.n_value = (unsigned long) (v))
  98 /* Assume that a symbol cannot be simultaneously in more than on segment */
  99 /* set segment */
 100 #define S_SET_SEGMENT(s,seg)    ((s)->sy_symbol.n_type &= ~N_TYPE,(s)->sy_symbol.n_type|=SEGMENT_TO_SYMBOL_TYPE(seg))
 101 /* The symbol is external */
 102 #define S_SET_EXTERNAL(s)       ((s)->sy_symbol.n_type |= N_EXT)
 103 /* The symbol is not external */
 104 #define S_CLEAR_EXTERNAL(s)     ((s)->sy_symbol.n_type &= ~N_EXT)
 105 /* Set the name of the symbol */
 106 #define S_SET_NAME(s,v)         ((s)->sy_symbol.n_un.n_name = (v))
 107 /* Set the offset in the string table */
 108 #define S_SET_OFFSET(s,v)       ((s)->sy_symbol.n_un.n_strx = (v))
 109 /* Set the n_other expression value */
 110 #define S_SET_OTHER(s,v)        ((s)->sy_symbol.n_other = (v))
 111 /* Set the n_desc expression value */
 112 #define S_SET_DESC(s,v)         ((s)->sy_symbol.n_desc = (v))
 113
 114 /* File header macro and type definition */
 115
 116 #define H_GET_FILE_SIZE(h)      (H_GET_HEADER_SIZE(h) \
 117                                  + H_GET_TEXT_SIZE(h) \
 118                                  + H_GET_DATA_SIZE(h) \
 119                                  + H_GET_SYMBOL_TABLE_SIZE(h) \
 120                                  + H_GET_TEXT_RELOCATION_SIZE(h) \
 121                                  + H_GET_DATA_RELOCATION_SIZE(h) \
 122                                  + H_GET_STRING_SIZE(h))
 123
 124 #define H_GET_HEADER_SIZE(h)            (sizeof(struct exec))
 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_ENTRY_POINT(h)            ((h)->header.a_entry)
 132 #define H_GET_STRING_SIZE(h)            ((h)->string_table_size)
 133 #define H_GET_LINENO_SIZE(h)            (0)
 134
 135 #define H_GET_DYNAMIC(h)                ((h)->header.a_info >> 31)
 136 #define H_GET_VERSION(h)                (((h)->header.a_info >> 24) & 0x7f)
 137 #define H_GET_MACHTYPE(h)               (((h)->header.a_info >> 16) & 0xff)
 138 #define H_GET_MAGIC_NUMBER(h)           ((h)->header.a_info & 0xffff)
 139
 140 #define H_SET_DYNAMIC(h,v)              ((h)->header.a_info = (((v) << 31) \
 141                                                                | (H_GET_VERSION(h) << 24) \
 142                                                                | (H_GET_MACHTYPE(h) << 16) \
 143                                                                | (H_GET_MAGIC_NUMBER(h))))
 144
 145 #define H_SET_VERSION(h,v)              ((h)->header.a_info = ((H_GET_DYNAMIC(h) << 31) \
 146                                                                | ((v) << 24) \
 147                                                                | (H_GET_MACHTYPE(h) << 16) \
 148                                                                | (H_GET_MAGIC_NUMBER(h))))
 149
 150 #define H_SET_MACHTYPE(h,v)             ((h)->header.a_info = ((H_GET_DYNAMIC(h) << 31) \
 151                                                                | (H_GET_VERSION(h) << 24) \
 152                                                                | ((v) << 16) \
 153                                                                | (H_GET_MAGIC_NUMBER(h))))
 154
 155 #define H_SET_MAGIC_NUMBER(h,v)         ((h)->header.a_info = ((H_GET_DYNAMIC(h) << 31) \
 156                                                                | (H_GET_VERSION(h) << 24) \
 157                                                                | (H_GET_MACHTYPE(h) << 16) \
 158                                                                | ((v))))
 159
 160 #define H_SET_TEXT_SIZE(h,v)            ((h)->header.a_text = md_section_align(SEG_TEXT, (v)))
 161 #define H_SET_DATA_SIZE(h,v)            ((h)->header.a_data = md_section_align(SEG_DATA, (v)))
 162 #define H_SET_BSS_SIZE(h,v)             ((h)->header.a_bss = md_section_align(SEG_BSS, (v)))
 163
 164 #define H_SET_RELOCATION_SIZE(h,t,d)    (H_SET_TEXT_RELOCATION_SIZE((h),(t)),\
 165                                          H_SET_DATA_RELOCATION_SIZE((h),(d)))
 166
 167 #define H_SET_TEXT_RELOCATION_SIZE(h,v) ((h)->header.a_trsize = (v))
 168 #define H_SET_DATA_RELOCATION_SIZE(h,v) ((h)->header.a_drsize = (v))
 169 #define H_SET_SYMBOL_TABLE_SIZE(h,v)    ((h)->header.a_syms = (v) * \
 170                                          sizeof(struct nlist))
 171
 172 #define H_SET_ENTRY_POINT(h,v)          ((h)->header.a_entry = (v))
 173 #define H_SET_STRING_SIZE(h,v)          ((h)->string_table_size = (v))
 174
 175 /*
 176  * Current means for getting the name of a segment.
 177  * This will change for infinite-segments support (e.g. COFF).
 178  */
 179 #define segment_name(seg)  ( seg_name[(int)(seg)] )
 180 extern char *const seg_name[];
 181
 182 typedef struct {
 183         struct exec     header;                 /* a.out header */
 184         long    string_table_size;      /* names + '\0' + sizeof(int) */
 185 } object_headers;
 186
 187 /* line numbering stuff. */
 188 #define OBJ_EMIT_LINENO(a, b, c)        {;}
 189
 190 #define obj_symbol_new_hook(s)  {;}
 191
 192 #ifdef __STDC__
 193 struct fix;
 194 void tc_aout_fix_to_chars(char *where, struct fix *fixP, relax_addressT segment_address);
 195 #else
 196 void tc_aout_fix_to_chars();
 197 #endif /* __STDC__ */
 198
 199 /*
 200  * Local Variables:
 201  * comment-column: 0
 202  * fill-column: 131
 203  * End:
 204  */
 205
 206 /* end of obj-aout.h */