bfd/som.h

   1 /* HP PA-RISC SOM object file format:  definitions internal to BFD.
   2    Copyright (C) 1990, 91, 92, 93, 94, 95, 96, 1998
   3    Free Software Foundation, Inc.
   4
   5    Contributed by the Center for Software Science at the
   6    University of Utah (pa-gdb-bugs@cs.utah.edu).
   7
   8    This file is part of BFD, the Binary File Descriptor library.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  23    02111-1307, USA.  */
  24
  25 #ifndef _SOM_H
  26 #define _SOM_H
  27
  28 #include "libhppa.h"
  29
  30 #include <a.out.h>
  31 #include <lst.h>
  32 #include <ar.h>
  33
  34 /* The SOM BFD backend doesn't currently use anything from these
  35    two include files, but it's likely to need them in the future.  */
  36 #ifdef R_DLT_REL
  37 #include <shl.h>
  38 #include <dl.h>
  39 #endif
  40
  41 #if defined(HOST_HPPABSD) || defined (HOST_HPPAOSF)
  42 /* BSD uses a completely different scheme for object file identification.
  43    so for now, define _PA_RISC_ID to accept any random value for a model
  44    number.  */
  45 #undef _PA_RISC_ID
  46 #define _PA_RISC_ID(__m_num) 1
  47 #endif /* HOST_HPPABSD */
  48
  49 #define FILE_HDR_SIZE sizeof(struct header)
  50 #define AUX_HDR_SIZE sizeof(struct som_exec_auxhdr)
  51
  52 typedef struct som_symbol
  53   {
  54     asymbol symbol;
  55     unsigned int som_type;
  56
  57     /* Structured like the ELF tc_data union.  Allows more code sharing
  58        in GAS this way.  */
  59     union
  60       {
  61         struct
  62         {
  63           unsigned int hppa_arg_reloc;
  64           unsigned int hppa_priv_level;
  65         } ap;
  66         PTR any;
  67       }
  68     tc_data;
  69
  70     /* Index of this symbol in the symbol table.  Only used when
  71        building relocation streams for incomplete objects.  */
  72     int index;
  73
  74     /* How many times this symbol is used in a relocation.  By sorting
  75        the symbols from most used to least used we can significantly
  76        reduce the size of the relocation stream for incomplete objects.  */
  77     int reloc_count;
  78
  79     /* During object file writing, the offset of the name of this symbol
  80        in the SOM string table. */
  81     int stringtab_offset;
  82   }
  83 som_symbol_type;
  84
  85 /* A structure containing all the magic information stored in a BFD's
  86    private data which needs to be copied during an objcopy/strip run.  */
  87 struct som_exec_data
  88   {
  89     /* Sort-of a magic number.  BSD uses it to distinguish between
  90        native executables and hpux executables.  */
  91     short system_id;
  92
  93     /* Magic exec flags.  These control things like whether or not
  94        null pointer dereferencing is allowed and the like.  */
  95     long exec_flags;
  96
  97     /* Add more stuff here as needed.  Good examples of information
  98        we might want to pass would be presumed_dp, entry_* and maybe
  99        others from the file header.  */
 100   };
 101
 102 struct somdata
 103   {
 104     /* All the magic information about an executable which lives
 105        in the private BFD structure and needs to be copied from
 106        the input bfd to the output bfd during a objcopy/strip.  */
 107     struct som_exec_data *exec_data;
 108
 109     /* These three fields are only used when writing files and are
 110        generated from scratch.  They need not be copied for objcopy
 111        or strip to work.  */
 112     struct header *file_hdr;
 113     struct copyright_aux_hdr *copyright_aux_hdr;
 114     struct user_string_aux_hdr *version_aux_hdr;
 115     struct som_exec_auxhdr *exec_hdr;
 116     COMPUNIT *comp_unit;
 117
 118     /* Pointers to a saved copy of the symbol and string tables.  These
 119        need not be copied for objcopy or strip to work.  */
 120     som_symbol_type *symtab;
 121     char *stringtab;
 122     asymbol **sorted_syms;
 123
 124     /* We remember these offsets so that after check_file_format, we have
 125        no dependencies on the particular format of the exec_hdr.
 126        These offsets need not be copied for objcopy or strip to work.  */
 127
 128     file_ptr sym_filepos;
 129     file_ptr str_filepos;
 130     file_ptr reloc_filepos;
 131     unsigned stringtab_size;
 132   };
 133
 134 struct som_data_struct
 135   {
 136     struct somdata a;
 137   };
 138
 139 /* Substructure of som_section_data_struct used to hold information
 140    which can't be represented by the generic BFD section structure,
 141    but which must be copied during objcopy or strip.  */
 142 struct som_copyable_section_data_struct
 143   {
 144     /* Various fields in space and subspace headers that we need
 145        to pass around.  */
 146     unsigned int sort_key : 8;
 147     unsigned int access_control_bits : 7;
 148     unsigned int is_defined : 1;
 149     unsigned int is_private : 1;
 150     unsigned int quadrant : 2;
 151
 152     /* For subspaces, this points to the section which represents the
 153        space in which the subspace is contained.  For spaces it points
 154        back to the section for this space.  */
 155     asection *container;
 156
 157     /* The user-specified space number.  It is wrong to use this as
 158        an index since duplicates and holes are allowed.  */
 159     int space_number;
 160
 161     /* Add more stuff here as needed.  Good examples of information
 162        we might want to pass would be initialization pointers,
 163        and the many subspace flags we do not represent yet.  */
 164   };
 165
 166 /* Used to keep extra SOM specific information for a given section.
 167
 168    reloc_size holds the size of the relocation stream, note this
 169    is very different from the number of relocations as SOM relocations
 170    are variable length.
 171
 172    reloc_stream is the actual stream of relocation entries.  */
 173
 174 struct som_section_data_struct
 175   {
 176     struct som_copyable_section_data_struct *copy_data;
 177     unsigned int reloc_size;
 178     char *reloc_stream;
 179     struct space_dictionary_record *space_dict;
 180     struct subspace_dictionary_record *subspace_dict;
 181   };
 182
 183 #define somdata(bfd)                    ((bfd)->tdata.som_data->a)
 184 #define obj_som_exec_data(bfd)          (somdata(bfd).exec_data)
 185 #define obj_som_file_hdr(bfd)           (somdata(bfd).file_hdr)
 186 #define obj_som_exec_hdr(bfd)           (somdata(bfd).exec_hdr)
 187 #define obj_som_copyright_hdr(bfd)      (somdata(bfd).copyright_aux_hdr)
 188 #define obj_som_version_hdr(bfd)        (somdata(bfd).version_aux_hdr)
 189 #define obj_som_compilation_unit(bfd)   (somdata(bfd).comp_unit)
 190 #define obj_som_symtab(bfd)             (somdata(bfd).symtab)
 191 #define obj_som_stringtab(bfd)          (somdata(bfd).stringtab)
 192 #define obj_som_sym_filepos(bfd)        (somdata(bfd).sym_filepos)
 193 #define obj_som_str_filepos(bfd)        (somdata(bfd).str_filepos)
 194 #define obj_som_stringtab_size(bfd)     (somdata(bfd).stringtab_size)
 195 #define obj_som_reloc_filepos(bfd)      (somdata(bfd).reloc_filepos)
 196 #define obj_som_sorted_syms(bfd)        (somdata(bfd).sorted_syms)
 197 #define som_section_data(sec) \
 198   ((struct som_section_data_struct *)sec->used_by_bfd)
 199 #define som_symbol_data(symbol)         ((som_symbol_type *) symbol)
 200
 201
 202 /* Defines groups of basic relocations.  FIXME:  These should
 203    be the only basic relocations created by GAS.  The rest
 204    should be internal to the BFD backend.
 205
 206    The idea is both SOM and ELF define these basic relocation
 207    types so they map into a SOM or ELF specific reloation as
 208    appropriate.  This allows GAS to share much more code
 209    between the two object formats.  */
 210
 211 #define R_HPPA_NONE                     R_NO_RELOCATION
 212 #define R_HPPA                          R_CODE_ONE_SYMBOL
 213 #define R_HPPA_PCREL_CALL               R_PCREL_CALL
 214 #define R_HPPA_ABS_CALL                 R_ABS_CALL
 215 #define R_HPPA_GOTOFF                   R_DP_RELATIVE
 216 #define R_HPPA_ENTRY                    R_ENTRY
 217 #define R_HPPA_EXIT                     R_EXIT
 218 #define R_HPPA_COMPLEX                  R_COMP1
 219 #define R_HPPA_BEGIN_BRTAB              R_BEGIN_BRTAB
 220 #define R_HPPA_END_BRTAB                R_END_BRTAB
 221 #define R_HPPA_BEGIN_TRY                R_BEGIN_TRY
 222 #define R_HPPA_END_TRY                  R_END_TRY
 223
 224 /* Exported functions, mostly for use by GAS.  */
 225 boolean bfd_som_set_section_attributes PARAMS ((asection *, int, int,
 226                                                 unsigned int, int));
 227 boolean bfd_som_set_subsection_attributes PARAMS ((asection *, asection *,
 228                                                    int, unsigned int, int));
 229 void bfd_som_set_symbol_type PARAMS ((asymbol *, unsigned int));
 230 boolean bfd_som_attach_aux_hdr PARAMS ((bfd *, int, char *));
 231 int ** hppa_som_gen_reloc_type
 232   PARAMS ((bfd *, int, int, enum hppa_reloc_field_selector_type_alt,
 233            int, asymbol *));
 234 boolean bfd_som_attach_compilation_unit
 235   PARAMS ((bfd *, const char *, const char *, const char *, const char *));
 236
 237 #endif /* _SOM_H */