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 #include "libhppa.h"
  28
  29 #include <a.out.h>
  30 #include <lst.h>
  31 #include <ar.h>
  32
  33
  34 #if defined(HOST_HPPABSD) || defined (HOST_HPPAOSF)
  35 /* BSD uses a completely different scheme for object file identification.
  36    so for now, define _PA_RISC_ID to accept any random value for a model
  37    number.  */
  38 #undef _PA_RISC_ID
  39 #define _PA_RISC_ID(__m_num) 1
  40 #endif /* HOST_HPPABSD */
  41
  42 #define FILE_HDR_SIZE sizeof(struct header)
  43 #define AUX_HDR_SIZE sizeof(struct som_exec_auxhdr)
  44
  45 typedef struct som_symbol
  46   {
  47     asymbol symbol;
  48     short desc;
  49     char other;
  50     unsigned char type;
  51     unsigned int som_type;
  52
  53     /* Structured like the ELF tc_data union.  Allows more code sharing
  54        in GAS this way.  */
  55     union
  56       {
  57         unsigned int hppa_arg_reloc;
  58         PTR any;
  59       }
  60     tc_data;
  61
  62     /* Index of this symbol in the symbol table.  Only used when
  63        building relocation streams for incomplete objects.  */
  64     int index;
  65
  66     /* How many times this symbol is used in a relocation.  By sorting
  67        the symbols from most used to least used we can significantly
  68        reduce the size of the relocation stream for incomplete objects.  */
  69     int reloc_count;
  70
  71     /* The unwind descriptor bits associated with R_ENTRY relocations
  72        for functions (not enough room in a BFD reloc to store all the
  73        information, so we tack it onto the symbol associated with the
  74        function.  */
  75     char *unwind;
  76   }
  77 som_symbol_type;
  78
  79 struct somdata
  80   {
  81     struct header *file_hdr;
  82     struct copyright_aux_hdr *copyright_aux_hdr;
  83     struct user_string_aux_hdr *version_aux_hdr;
  84     som_symbol_type *symtab;
  85     char *stringtab;
  86
  87     /* We remember these offsets so that after check_file_format, we have
  88        no dependencies on the particular format of the exec_hdr.  */
  89
  90     file_ptr sym_filepos;
  91     file_ptr str_filepos;
  92     file_ptr reloc_filepos;
  93
  94     unsigned stringtab_size;
  95   };
  96
  97 struct som_data_struct
  98   {
  99     struct somdata a;
 100   };
 101
 102 /* Used to keep extra SOM specific information for a given section.
 103
 104    reloc_size holds the size of the relocation stream, note this
 105    is very different from the number of relocations as SOM relocations
 106    are variable length.
 107
 108    reloc_stream is the actual stream of relocation entries.
 109
 110    The BFD section index may not exactly match a SOM subspace index,
 111    for this reason we keep track of the original SOM subspace index
 112    when a subspace is turned into a BFD section.  */
 113
 114 struct som_section_data_struct
 115   {
 116     unsigned int reloc_size;
 117     char *reloc_stream;
 118     unsigned int subspace_index;
 119     asection *containing_space;
 120     int is_space;
 121     struct space_dictionary_record space_dict;
 122     int is_subspace;
 123     struct subspace_dictionary_record subspace_dict;
 124   };
 125
 126 #define somdata(bfd)                    ((bfd)->tdata.som_data->a)
 127 #define obj_som_file_hdr(bfd)           (somdata(bfd).file_hdr)
 128 #define obj_som_copyright_hdr(bfd)      (somdata(bfd).copyright_aux_hdr)
 129 #define obj_som_version_hdr(bfd)        (somdata(bfd).version_aux_hdr)
 130 #define obj_som_symtab(bfd)             (somdata(bfd).symtab)
 131 #define obj_som_stringtab(bfd)          (somdata(bfd).stringtab)
 132 #define obj_som_sym_filepos(bfd)        (somdata(bfd).sym_filepos)
 133 #define obj_som_str_filepos(bfd)        (somdata(bfd).str_filepos)
 134 #define obj_som_stringtab_size(bfd)     (somdata(bfd).stringtab_size)
 135 #define obj_som_reloc_filepos(bfd)      (somdata(bfd).reloc_filepos)
 136 #define som_section_data(sec) \
 137   ((struct som_section_data_struct *)sec->used_by_bfd)
 138 #define som_symbol_data(symbol) \
 139   ((som_symbol_type *) symbol)
 140
 141
 142 /* Defines groups of basic relocations.  FIXME:  These should
 143    be the only basic relocations created by GAS.  The rest
 144    should be internal to the BFD backend.
 145
 146    The idea is both SOM and ELF define these basic relocation
 147    types so they map into a SOM or ELF specific reloation as
 148    appropriate.  This allows GAS to share much more code
 149    between the two object formats.  */
 150
 151 #define R_HPPA_NONE                     R_NO_RELOCATION
 152 #define R_HPPA                          R_CODE_ONE_SYMBOL
 153 #define R_HPPA_ABS_CALL                 R_ABS_CALL
 154 #define R_HPPA_PCREL_CALL               R_PCREL_CALL
 155 #define R_HPPA_GOTOFF                   R_DP_RELATIVE
 156 #define R_HPPA_COMPLEX                  R_COMP1
 157 #define R_HPPA_COMPLEX_PCREL_CALL       R_COMP2
 158 #define R_HPPA_COMPLEX_ABS_CALL         R_COMP3
 159 #define R_HPPA_ENTRY                    R_ENTRY
 160 #define R_HPPA_EXIT                     R_EXIT
 161
 162 /* Exported functions, mostly for use by GAS.  */
 163 void bfd_som_set_section_attributes PARAMS ((asection *, int, int,
 164                                              unsigned int, int));
 165 void bfd_som_set_subsection_attributes PARAMS ((asection *, asection *,
 166                                                 int, unsigned int, int));
 167 void bfd_som_set_symbol_type PARAMS ((asymbol *, unsigned int));
 168 void bfd_som_attach_unwind_info PARAMS ((asymbol *, char *));
 169 boolean bfd_som_attach_aux_hdr PARAMS ((bfd *, int, char *));
 170 int ** hppa_som_gen_reloc_type
 171   PARAMS ((bfd *, int, int, enum hppa_reloc_field_selector_type_alt));
 172 #endif /* _SOM_H */