bfd/som.h

   1 /* HP PA-RISC SOM object file format:  definitions internal to BFD.
   2    Copyright (C) 1990-1991 Free Software Foundation, Inc.
   3
   4    Contributed by the Center for Software Science at the
   5    University of Utah (pa-gdb-bugs@cs.utah.edu).
   6
   7    This file is part of BFD, the Binary File Descriptor library.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  22
  23 #ifndef _SOM_H
  24 #define _SOM_H
  25
  26 #include "../bfd/sysdep.h"
  27
  28 #include <a.out.h>
  29
  30
  31 #ifdef HOST_HPPABSD
  32 /* BSD uses a completely different scheme for object file identification.
  33    so for now, define _PA_RISC_ID to accept any random value for a model
  34    number.  */
  35 #undef _PA_RISC_ID
  36 #define _PA_RISC_ID(__m_num) 1
  37 #endif /* HOST_HPPABSD */
  38
  39 #define FILE_HDR_SIZE sizeof(struct header)
  40 #define AUX_HDR_SIZE sizeof(struct som_exec_auxhdr)
  41
  42 typedef struct som_symbol
  43   {
  44     asymbol symbol;
  45     short desc;
  46     char other;
  47     unsigned char type;
  48     unsigned int som_type;
  49
  50     /* Structured like the ELF tc_data union.  Allows more code sharing
  51        in GAS this way.  */
  52     union
  53       {
  54         unsigned int hppa_arg_reloc;
  55         PTR any;
  56       }
  57     tc_data;
  58
  59     /* Index of this symbol in the symbol table.  Only used when
  60        building relocation streams for incomplete objects.  */
  61     int index;
  62
  63     /* How many times this symbol is used in a relocation.  By sorting
  64        the symbols from most used to least used we can significantly
  65        reduce the size of the relocation stream for incomplete objects.  */
  66     int reloc_count;
  67
  68     /* The unwind descriptor bits associated with R_ENTRY relocations
  69        for functions (not enough room in a BFD reloc to store all the
  70        information, so we tack it onto the symbol associated with the
  71        function.  */
  72     char *unwind;
  73   }
  74 som_symbol_type;
  75
  76 struct somdata
  77   {
  78     struct header *file_hdr;
  79     som_symbol_type *symtab;
  80     char *stringtab;
  81
  82     /* We remember these offsets so that after check_file_format, we have
  83        no dependencies on the particular format of the exec_hdr.  */
  84
  85     file_ptr sym_filepos;
  86     file_ptr str_filepos;
  87     file_ptr reloc_filepos;
  88
  89     unsigned stringtab_size;
  90   };
  91
  92 struct som_data_struct
  93   {
  94     struct somdata a;
  95   };
  96
  97 /* Used to keep extra SOM specific information for a given section.
  98
  99    reloc_size holds the size of the relocation stream, note this
 100    is very different from the number of relocations as SOM relocations
 101    are variable length.
 102
 103    reloc_stream is the actual stream of relocation entries.
 104
 105    The BFD section index may not exactly match a SOM subspace index,
 106    for this reason we keep track of the original SOM subspace index
 107    when a subspace is turned into a BFD section.  */
 108
 109 struct som_section_data_struct
 110   {
 111     unsigned int reloc_size;
 112     char *reloc_stream;
 113     unsigned int subspace_index;
 114     asection *containing_space;
 115     int is_space;
 116     struct space_dictionary_record space_dict;
 117     int is_subspace;
 118     struct subspace_dictionary_record subspace_dict;
 119   };
 120
 121 #define somdata(bfd)                    ((bfd)->tdata.som_data->a)
 122 #define obj_som_file_hdr(bfd)           (somdata(bfd).file_hdr)
 123 #define obj_som_symtab(bfd)             (somdata(bfd).symtab)
 124 #define obj_som_stringtab(bfd)          (somdata(bfd).stringtab)
 125 #define obj_som_sym_filepos(bfd)        (somdata(bfd).sym_filepos)
 126 #define obj_som_str_filepos(bfd)        (somdata(bfd).str_filepos)
 127 #define obj_som_stringtab_size(bfd)     (somdata(bfd).stringtab_size)
 128 #define obj_som_reloc_filepos(bfd)      (somdata(bfd).reloc_filepos)
 129 #define som_section_data(sec) \
 130   ((struct som_section_data_struct *)sec->used_by_bfd)
 131 #define som_symbol_data(symbol) \
 132   (((som_symbol_type **) symbol->udata))
 133
 134
 135 /* Defines groups of basic relocations.  FIXME:  These should
 136    be the only basic relocations created by GAS.  The rest
 137    should be internal to the BFD backend.
 138
 139    The idea is both SOM and ELF define these basic relocation
 140    types so they map into a SOM or ELF specific reloation as
 141    appropriate.  This allows GAS to share much more code
 142    between the two object formats.  */
 143
 144 #define R_HPPA_NONE                     R_NO_RELOCATION
 145 #define R_HPPA                          R_CODE_ONE_SYMBOL
 146 #define R_HPPA_ABS_CALL                 R_ABS_CALL
 147 #define R_HPPA_PCREL_CALL               R_PCREL_CALL
 148 #define R_HPPA_GOTOFF                   R_DP_RELATIVE
 149 #define R_HPPA_COMPLEX                  R_COMP1
 150 #define R_HPPA_COMPLEX_PCREL_CALL       R_COMP2
 151 #define R_HPPA_COMPLEX_ABS_CALL         R_COMP3
 152 #define R_HPPA_ENTRY                    R_ENTRY
 153 #define R_HPPA_EXIT                     R_EXIT
 154
 155 #endif /* _SOM_H */