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, 2003, 2004 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 /* We want reloc.h to provide PA 2.0 defines.  */
  31 #define PA_2_0
  32
  33 #include <a.out.h>
  34 #include <lst.h>
  35 #include <ar.h>
  36
  37 /* The SOM BFD backend doesn't currently use anything from these
  38    two include files, but it's likely to need them in the future.  */
  39 #ifdef R_DLT_REL
  40 #include <shl.h>
  41 #include <dl.h>
  42 #endif
  43
  44 #if defined(HOST_HPPABSD) || defined (HOST_HPPAOSF)
  45 /* BSD uses a completely different scheme for object file identification.
  46    so for now, define _PA_RISC_ID to accept any random value for a model
  47    number.  */
  48 #undef _PA_RISC_ID
  49 #define _PA_RISC_ID(__m_num) 1
  50 #endif /* HOST_HPPABSD */
  51
  52 #define FILE_HDR_SIZE sizeof (struct header)
  53 #define AUX_HDR_SIZE sizeof (struct som_exec_auxhdr)
  54
  55 typedef struct som_symbol
  56   {
  57     asymbol symbol;
  58     unsigned int som_type;
  59
  60     /* Structured like the ELF tc_data union.  Allows more code sharing
  61        in GAS this way.  */
  62     union
  63       {
  64         struct
  65         {
  66           unsigned int hppa_arg_reloc;
  67           unsigned int hppa_priv_level;
  68         } ap;
  69         PTR any;
  70       }
  71     tc_data;
  72
  73     /* Index of this symbol in the symbol table.  Only used when
  74        building relocation streams for incomplete objects.  */
  75     int index;
  76
  77     /* How many times this symbol is used in a relocation.  By sorting
  78        the symbols from most used to least used we can significantly
  79        reduce the size of the relocation stream for incomplete objects.  */
  80     int reloc_count;
  81
  82     /* During object file writing, the offset of the name of this symbol
  83        in the SOM string table.  */
  84     int stringtab_offset;
  85   }
  86 som_symbol_type;
  87
  88 /* A structure containing all the magic information stored in a BFD's
  89    private data which needs to be copied during an objcopy/strip run.  */
  90 struct som_exec_data
  91   {
  92     /* Sort-of a magic number.  BSD uses it to distinguish between
  93        native executables and hpux executables.  */
  94     short system_id;
  95
  96     /* Magic exec flags.  These control things like whether or not
  97        null pointer dereferencing is allowed and the like.  */
  98     long exec_flags;
  99
 100     /* We must preserve the version identifier too.  Some versions
 101        of the HP linker do not grok NEW_VERSION_ID for reasons unknown.  */
 102     unsigned int version_id;
 103
 104     /* Add more stuff here as needed.  Good examples of information
 105        we might want to pass would be presumed_dp, entry_* and maybe
 106        others from the file header.  */
 107   };
 108
 109 struct somdata
 110   {
 111     /* All the magic information about an executable which lives
 112        in the private BFD structure and needs to be copied from
 113        the input bfd to the output bfd during an objcopy/strip.  */
 114     struct som_exec_data *exec_data;
 115
 116     /* These three fields are only used when writing files and are
 117        generated from scratch.  They need not be copied for objcopy
 118        or strip to work.  */
 119     struct header *file_hdr;
 120     struct copyright_aux_hdr *copyright_aux_hdr;
 121     struct user_string_aux_hdr *version_aux_hdr;
 122     struct som_exec_auxhdr *exec_hdr;
 123     COMPUNIT *comp_unit;
 124
 125     /* Pointers to a saved copy of the symbol and string tables.  These
 126        need not be copied for objcopy or strip to work.  */
 127     som_symbol_type *symtab;
 128     char *stringtab;
 129     asymbol **sorted_syms;
 130
 131     /* We remember these offsets so that after check_file_format, we have
 132        no dependencies on the particular format of the exec_hdr.
 133        These offsets need not be copied for objcopy or strip to work.  */
 134
 135     file_ptr sym_filepos;
 136     file_ptr str_filepos;
 137     file_ptr reloc_filepos;
 138     unsigned stringtab_size;
 139   };
 140
 141 struct som_data_struct
 142   {
 143     struct somdata a;
 144   };
 145
 146 struct som_subspace_dictionary_record
 147   {
 148     int space_index;
 149     unsigned int access_control_bits : 7;
 150     unsigned int memory_resident : 1;
 151     unsigned int dup_common : 1;
 152     unsigned int is_common : 1;
 153     unsigned int is_loadable : 1;
 154     unsigned int quadrant : 2;
 155     unsigned int initially_frozen : 1;
 156     unsigned int is_first : 1;
 157     unsigned int code_only : 1;
 158     unsigned int sort_key : 8;
 159     unsigned int replicate_init : 1;
 160     unsigned int continuation : 1;
 161     unsigned int is_tspecific : 1;
 162     unsigned int is_comdat : 1;
 163     unsigned int reserved : 4;
 164     int file_loc_init_value;
 165     unsigned int initialization_length;
 166     unsigned int subspace_start;
 167     unsigned int subspace_length;
 168     unsigned int reserved2 : 5;
 169     unsigned int alignment :27;
 170     union name_pt name;
 171     int fixup_request_index;
 172     unsigned int fixup_request_quantity;
 173   };
 174
 175 /* Substructure of som_section_data_struct used to hold information
 176    which can't be represented by the generic BFD section structure,
 177    but which must be copied during objcopy or strip.  */
 178 struct som_copyable_section_data_struct
 179   {
 180     /* Various fields in space and subspace headers that we need
 181        to pass around.  */
 182     unsigned int sort_key : 8;
 183     unsigned int access_control_bits : 7;
 184     unsigned int is_defined : 1;
 185     unsigned int is_private : 1;
 186     unsigned int quadrant : 2;
 187     unsigned int is_comdat : 1;
 188     unsigned int is_common : 1;
 189     unsigned int dup_common : 1;
 190
 191     /* For subspaces, this points to the section which represents the
 192        space in which the subspace is contained.  For spaces it points
 193        back to the section for this space.  */
 194     asection *container;
 195
 196     /* The user-specified space number.  It is wrong to use this as
 197        an index since duplicates and holes are allowed.  */
 198     int space_number;
 199
 200     /* Add more stuff here as needed.  Good examples of information
 201        we might want to pass would be initialization pointers,
 202        and the many subspace flags we do not represent yet.  */
 203   };
 204
 205 /* Used to keep extra SOM specific information for a given section.
 206
 207    reloc_size holds the size of the relocation stream, note this
 208    is very different from the number of relocations as SOM relocations
 209    are variable length.
 210
 211    reloc_stream is the actual stream of relocation entries.  */
 212
 213 struct som_section_data_struct
 214   {
 215     struct som_copyable_section_data_struct *copy_data;
 216     unsigned int reloc_size;
 217     char *reloc_stream;
 218     struct space_dictionary_record *space_dict;
 219     struct som_subspace_dictionary_record *subspace_dict;
 220   };
 221
 222 #define somdata(bfd)                    ((bfd)->tdata.som_data->a)
 223 #define obj_som_exec_data(bfd)          (somdata(bfd).exec_data)
 224 #define obj_som_file_hdr(bfd)           (somdata(bfd).file_hdr)
 225 #define obj_som_exec_hdr(bfd)           (somdata(bfd).exec_hdr)
 226 #define obj_som_copyright_hdr(bfd)      (somdata(bfd).copyright_aux_hdr)
 227 #define obj_som_version_hdr(bfd)        (somdata(bfd).version_aux_hdr)
 228 #define obj_som_compilation_unit(bfd)   (somdata(bfd).comp_unit)
 229 #define obj_som_symtab(bfd)             (somdata(bfd).symtab)
 230 #define obj_som_stringtab(bfd)          (somdata(bfd).stringtab)
 231 #define obj_som_sym_filepos(bfd)        (somdata(bfd).sym_filepos)
 232 #define obj_som_str_filepos(bfd)        (somdata(bfd).str_filepos)
 233 #define obj_som_stringtab_size(bfd)     (somdata(bfd).stringtab_size)
 234 #define obj_som_reloc_filepos(bfd)      (somdata(bfd).reloc_filepos)
 235 #define obj_som_sorted_syms(bfd)        (somdata(bfd).sorted_syms)
 236 #define som_section_data(sec) \
 237   ((struct som_section_data_struct *)sec->used_by_bfd)
 238 #define som_symbol_data(symbol)         ((som_symbol_type *) symbol)
 239
 240 /* Defines groups of basic relocations.  FIXME:  These should
 241    be the only basic relocations created by GAS.  The rest
 242    should be internal to the BFD backend.
 243
 244    The idea is both SOM and ELF define these basic relocation
 245    types so they map into a SOM or ELF specific relocation as
 246    appropriate.  This allows GAS to share much more code
 247    between the two object formats.  */
 248
 249 #define R_HPPA_NONE                     R_NO_RELOCATION
 250 #define R_HPPA                          R_CODE_ONE_SYMBOL
 251 #define R_HPPA_PCREL_CALL               R_PCREL_CALL
 252 #define R_HPPA_ABS_CALL                 R_ABS_CALL
 253 #define R_HPPA_GOTOFF                   R_DP_RELATIVE
 254 #define R_HPPA_ENTRY                    R_ENTRY
 255 #define R_HPPA_EXIT                     R_EXIT
 256 #define R_HPPA_COMPLEX                  R_COMP1
 257 #define R_HPPA_BEGIN_BRTAB              R_BEGIN_BRTAB
 258 #define R_HPPA_END_BRTAB                R_END_BRTAB
 259 #define R_HPPA_BEGIN_TRY                R_BEGIN_TRY
 260 #define R_HPPA_END_TRY                  R_END_TRY
 261
 262 /* Exported functions, mostly for use by GAS.  */
 263 bfd_boolean bfd_som_set_section_attributes
 264   PARAMS ((asection *, int, int, unsigned int, int));
 265 bfd_boolean bfd_som_set_subsection_attributes
 266   PARAMS ((asection *, asection *, int, unsigned int, int, int, int, int));
 267 void bfd_som_set_symbol_type PARAMS ((asymbol *, unsigned int));
 268 bfd_boolean bfd_som_attach_aux_hdr PARAMS ((bfd *, int, char *));
 269 int ** hppa_som_gen_reloc_type
 270   PARAMS ((bfd *, int, int, enum hppa_reloc_field_selector_type_alt,
 271            int, asymbol *));
 272 bfd_boolean bfd_som_attach_compilation_unit
 273   PARAMS ((bfd *, const char *, const char *, const char *, const char *));
 274
 275 #endif /* _SOM_H */