bfd/som.h

   1 /* HP PA-RISC SOM object file format:  definitions internal to BFD.
   2    Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 2000, 2001,
   3    2002 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     /* We must preserve the version identifier too.  Some versions
  98        of the HP linker do not grok NEW_VERSION_ID for reasons unknown.  */
  99     unsigned int version_id;
 100
 101     /* Add more stuff here as needed.  Good examples of information
 102        we might want to pass would be presumed_dp, entry_* and maybe
 103        others from the file header.  */
 104   };
 105
 106 struct somdata
 107   {
 108     /* All the magic information about an executable which lives
 109        in the private BFD structure and needs to be copied from
 110        the input bfd to the output bfd during an objcopy/strip.  */
 111     struct som_exec_data *exec_data;
 112
 113     /* These three fields are only used when writing files and are
 114        generated from scratch.  They need not be copied for objcopy
 115        or strip to work.  */
 116     struct header *file_hdr;
 117     struct copyright_aux_hdr *copyright_aux_hdr;
 118     struct user_string_aux_hdr *version_aux_hdr;
 119     struct som_exec_auxhdr *exec_hdr;
 120     COMPUNIT *comp_unit;
 121
 122     /* Pointers to a saved copy of the symbol and string tables.  These
 123        need not be copied for objcopy or strip to work.  */
 124     som_symbol_type *symtab;
 125     char *stringtab;
 126     asymbol **sorted_syms;
 127
 128     /* We remember these offsets so that after check_file_format, we have
 129        no dependencies on the particular format of the exec_hdr.
 130        These offsets need not be copied for objcopy or strip to work.  */
 131
 132     file_ptr sym_filepos;
 133     file_ptr str_filepos;
 134     file_ptr reloc_filepos;
 135     unsigned stringtab_size;
 136   };
 137
 138 struct som_data_struct
 139   {
 140     struct somdata a;
 141   };
 142
 143 /* Substructure of som_section_data_struct used to hold information
 144    which can't be represented by the generic BFD section structure,
 145    but which must be copied during objcopy or strip.  */
 146 struct som_copyable_section_data_struct
 147   {
 148     /* Various fields in space and subspace headers that we need
 149        to pass around.  */
 150     unsigned int sort_key : 8;
 151     unsigned int access_control_bits : 7;
 152     unsigned int is_defined : 1;
 153     unsigned int is_private : 1;
 154     unsigned int quadrant : 2;
 155
 156     /* For subspaces, this points to the section which represents the
 157        space in which the subspace is contained.  For spaces it points
 158        back to the section for this space.  */
 159     asection *container;
 160
 161     /* The user-specified space number.  It is wrong to use this as
 162        an index since duplicates and holes are allowed.  */
 163     int space_number;
 164
 165     /* Add more stuff here as needed.  Good examples of information
 166        we might want to pass would be initialization pointers,
 167        and the many subspace flags we do not represent yet.  */
 168   };
 169
 170 /* Used to keep extra SOM specific information for a given section.
 171
 172    reloc_size holds the size of the relocation stream, note this
 173    is very different from the number of relocations as SOM relocations
 174    are variable length.
 175
 176    reloc_stream is the actual stream of relocation entries.  */
 177
 178 struct som_section_data_struct
 179   {
 180     struct som_copyable_section_data_struct *copy_data;
 181     unsigned int reloc_size;
 182     char *reloc_stream;
 183     struct space_dictionary_record *space_dict;
 184     struct subspace_dictionary_record *subspace_dict;
 185   };
 186
 187 #define somdata(bfd)                    ((bfd)->tdata.som_data->a)
 188 #define obj_som_exec_data(bfd)          (somdata(bfd).exec_data)
 189 #define obj_som_file_hdr(bfd)           (somdata(bfd).file_hdr)
 190 #define obj_som_exec_hdr(bfd)           (somdata(bfd).exec_hdr)
 191 #define obj_som_copyright_hdr(bfd)      (somdata(bfd).copyright_aux_hdr)
 192 #define obj_som_version_hdr(bfd)        (somdata(bfd).version_aux_hdr)
 193 #define obj_som_compilation_unit(bfd)   (somdata(bfd).comp_unit)
 194 #define obj_som_symtab(bfd)             (somdata(bfd).symtab)
 195 #define obj_som_stringtab(bfd)          (somdata(bfd).stringtab)
 196 #define obj_som_sym_filepos(bfd)        (somdata(bfd).sym_filepos)
 197 #define obj_som_str_filepos(bfd)        (somdata(bfd).str_filepos)
 198 #define obj_som_stringtab_size(bfd)     (somdata(bfd).stringtab_size)
 199 #define obj_som_reloc_filepos(bfd)      (somdata(bfd).reloc_filepos)
 200 #define obj_som_sorted_syms(bfd)        (somdata(bfd).sorted_syms)
 201 #define som_section_data(sec) \
 202   ((struct som_section_data_struct *)sec->used_by_bfd)
 203 #define som_symbol_data(symbol)         ((som_symbol_type *) symbol)
 204
 205 /* Defines groups of basic relocations.  FIXME:  These should
 206    be the only basic relocations created by GAS.  The rest
 207    should be internal to the BFD backend.
 208
 209    The idea is both SOM and ELF define these basic relocation
 210    types so they map into a SOM or ELF specific reloation as
 211    appropriate.  This allows GAS to share much more code
 212    between the two object formats.  */
 213
 214 #define R_HPPA_NONE                     R_NO_RELOCATION
 215 #define R_HPPA                          R_CODE_ONE_SYMBOL
 216 #define R_HPPA_PCREL_CALL               R_PCREL_CALL
 217 #define R_HPPA_ABS_CALL                 R_ABS_CALL
 218 #define R_HPPA_GOTOFF                   R_DP_RELATIVE
 219 #define R_HPPA_ENTRY                    R_ENTRY
 220 #define R_HPPA_EXIT                     R_EXIT
 221 #define R_HPPA_COMPLEX                  R_COMP1
 222 #define R_HPPA_BEGIN_BRTAB              R_BEGIN_BRTAB
 223 #define R_HPPA_END_BRTAB                R_END_BRTAB
 224 #define R_HPPA_BEGIN_TRY                R_BEGIN_TRY
 225 #define R_HPPA_END_TRY                  R_END_TRY
 226
 227 /* Exported functions, mostly for use by GAS.  */
 228 bfd_boolean bfd_som_set_section_attributes
 229   PARAMS ((asection *, int, int, unsigned int, int));
 230 bfd_boolean bfd_som_set_subsection_attributes
 231   PARAMS ((asection *, asection *, int, unsigned int, int));
 232 void bfd_som_set_symbol_type PARAMS ((asymbol *, unsigned int));
 233 bfd_boolean bfd_som_attach_aux_hdr PARAMS ((bfd *, int, char *));
 234 int ** hppa_som_gen_reloc_type
 235   PARAMS ((bfd *, int, int, enum hppa_reloc_field_selector_type_alt,
 236            int, asymbol *));
 237 bfd_boolean bfd_som_attach_compilation_unit
 238   PARAMS ((bfd *, const char *, const char *, const char *, const char *));
 239
 240 #endif /* _SOM_H */