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, 2005 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., 51 Franklin Street - Fifth Floor, Boston, MA
  23    02110-1301, 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   unsigned 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)      ((struct som_section_data_struct *) sec->used_by_bfd)
 237 #define som_symbol_data(symbol)         ((som_symbol_type *) symbol)
 238
 239 /* Defines groups of basic relocations.  FIXME:  These should
 240    be the only basic relocations created by GAS.  The rest
 241    should be internal to the BFD backend.
 242
 243    The idea is both SOM and ELF define these basic relocation
 244    types so they map into a SOM or ELF specific relocation as
 245    appropriate.  This allows GAS to share much more code
 246    between the two object formats.  */
 247
 248 #define R_HPPA_NONE                     R_NO_RELOCATION
 249 #define R_HPPA                          R_CODE_ONE_SYMBOL
 250 #define R_HPPA_PCREL_CALL               R_PCREL_CALL
 251 #define R_HPPA_ABS_CALL                 R_ABS_CALL
 252 #define R_HPPA_GOTOFF                   R_DP_RELATIVE
 253 #define R_HPPA_ENTRY                    R_ENTRY
 254 #define R_HPPA_EXIT                     R_EXIT
 255 #define R_HPPA_COMPLEX                  R_COMP1
 256 #define R_HPPA_BEGIN_BRTAB              R_BEGIN_BRTAB
 257 #define R_HPPA_END_BRTAB                R_END_BRTAB
 258 #define R_HPPA_BEGIN_TRY                R_BEGIN_TRY
 259 #define R_HPPA_END_TRY                  R_END_TRY
 260
 261 /* Exported functions, mostly for use by GAS.  */
 262 bfd_boolean  bfd_som_set_section_attributes    (asection *, int, int, unsigned int, int);
 263 bfd_boolean  bfd_som_set_subsection_attributes (asection *, asection *, int, unsigned int, int, int, int, int);
 264 void         bfd_som_set_symbol_type           (asymbol *, unsigned int);
 265 bfd_boolean  bfd_som_attach_aux_hdr            (bfd *, int, char *);
 266 int **       hppa_som_gen_reloc_type           (bfd *, int, int, enum hppa_reloc_field_selector_type_alt, int, asymbol *);
 267 bfd_boolean  bfd_som_attach_compilation_unit   (bfd *, const char *, const char *, const char *, const char *);
 268
 269 #endif /* _SOM_H */