bfd/som.h

   1 /* HP PA-RISC SOM object file format:  definitions internal to BFD.
   2    Copyright (C) 1990-2017 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 3 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., 51 Franklin Street - Fifth Floor, Boston, MA
  22    02110-1301, USA.  */
  23
  24 #ifndef _SOM_H
  25 #define _SOM_H
  26
  27 #include "libhppa.h"
  28
  29 /* We want reloc.h to provide PA 2.0 defines.  */
  30 #define PA_2_0
  31
  32 #include "som/aout.h"
  33 #include "som/lst.h"
  34 #include "som/internal.h"
  35
  36 /* The SOM BFD backend doesn't currently use anything from these
  37    two include files, but it's likely to need them in the future.  */
  38 #ifdef R_DLT_REL
  39 #include <shl.h>
  40 #include <dl.h>
  41 #endif
  42
  43 #ifdef __cplusplus
  44 extern "C" {
  45 #endif
  46
  47 #if defined (HOST_HPPABSD) || defined (HOST_HPPAOSF)
  48 /* BSD uses a completely different scheme for object file identification.
  49    so for now, define _PA_RISC_ID to accept any random value for a model
  50    number.  */
  51 #undef _PA_RISC_ID
  52 #define _PA_RISC_ID(__m_num) 1
  53 #endif /* HOST_HPPABSD */
  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     void * 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 som_header *file_hdr;
 120   struct som_string_auxhdr *copyright_aux_hdr;
 121   struct som_string_auxhdr *version_aux_hdr;
 122   struct som_exec_auxhdr *exec_hdr;
 123   struct som_compilation_unit *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   void * line_info;
 140 };
 141
 142 struct som_data_struct
 143 {
 144   struct somdata a;
 145 };
 146
 147 /* Substructure of som_section_data_struct used to hold information
 148    which can't be represented by the generic BFD section structure,
 149    but which must be copied during objcopy or strip.  */
 150 struct som_copyable_section_data_struct
 151 {
 152   /* Various fields in space and subspace headers that we need
 153      to pass around.  */
 154   unsigned int sort_key : 8;
 155   unsigned int access_control_bits : 7;
 156   unsigned int is_defined : 1;
 157   unsigned int is_private : 1;
 158   unsigned int quadrant : 2;
 159   unsigned int is_comdat : 1;
 160   unsigned int is_common : 1;
 161   unsigned int dup_common : 1;
 162
 163   /* For subspaces, this points to the section which represents the
 164      space in which the subspace is contained.  For spaces it points
 165      back to the section for this space.  */
 166   asection *container;
 167
 168   /* The user-specified space number.  It is wrong to use this as
 169      an index since duplicates and holes are allowed.  */
 170   int space_number;
 171
 172   /* Add more stuff here as needed.  Good examples of information
 173      we might want to pass would be initialization pointers,
 174      and the many subspace flags we do not represent yet.  */
 175 };
 176
 177 /* Used to keep extra SOM specific information for a given section.
 178
 179    reloc_size holds the size of the relocation stream, note this
 180    is very different from the number of relocations as SOM relocations
 181    are variable length.
 182
 183    reloc_stream is the actual stream of relocation entries.  */
 184
 185 struct som_section_data_struct
 186 {
 187   struct som_copyable_section_data_struct *copy_data;
 188   unsigned int reloc_size;
 189   unsigned char *reloc_stream;
 190   struct som_space_dictionary_record *space_dict;
 191   struct som_subspace_dictionary_record *subspace_dict;
 192 };
 193
 194 #define somdata(bfd)                    ((bfd)->tdata.som_data->a)
 195 #define obj_som_exec_data(bfd)          (somdata (bfd).exec_data)
 196 #define obj_som_file_hdr(bfd)           (somdata (bfd).file_hdr)
 197 #define obj_som_exec_hdr(bfd)           (somdata (bfd).exec_hdr)
 198 #define obj_som_copyright_hdr(bfd)      (somdata (bfd).copyright_aux_hdr)
 199 #define obj_som_version_hdr(bfd)        (somdata (bfd).version_aux_hdr)
 200 #define obj_som_compilation_unit(bfd)   (somdata (bfd).comp_unit)
 201 #define obj_som_symtab(bfd)             (somdata (bfd).symtab)
 202 #define obj_som_stringtab(bfd)          (somdata (bfd).stringtab)
 203 #define obj_som_sym_filepos(bfd)        (somdata (bfd).sym_filepos)
 204 #define obj_som_str_filepos(bfd)        (somdata (bfd).str_filepos)
 205 #define obj_som_stringtab_size(bfd)     (somdata (bfd).stringtab_size)
 206 #define obj_som_reloc_filepos(bfd)      (somdata (bfd).reloc_filepos)
 207 #define obj_som_sorted_syms(bfd)        (somdata (bfd).sorted_syms)
 208 #define som_section_data(sec)      ((struct som_section_data_struct *) sec->used_by_bfd)
 209 #define som_symbol_data(symbol)         ((som_symbol_type *) symbol)
 210
 211 /* Defines groups of basic relocations.  FIXME:  These should
 212    be the only basic relocations created by GAS.  The rest
 213    should be internal to the BFD backend.
 214
 215    The idea is both SOM and ELF define these basic relocation
 216    types so they map into a SOM or ELF specific relocation as
 217    appropriate.  This allows GAS to share much more code
 218    between the two object formats.  */
 219
 220 #define R_HPPA_NONE                     R_NO_RELOCATION
 221 #define R_HPPA                          R_CODE_ONE_SYMBOL
 222 #define R_HPPA_PCREL_CALL               R_PCREL_CALL
 223 #define R_HPPA_ABS_CALL                 R_ABS_CALL
 224 #define R_HPPA_GOTOFF                   R_DP_RELATIVE
 225 #define R_HPPA_ENTRY                    R_ENTRY
 226 #define R_HPPA_EXIT                     R_EXIT
 227 #define R_HPPA_COMPLEX                  R_COMP1
 228 #define R_HPPA_BEGIN_BRTAB              R_BEGIN_BRTAB
 229 #define R_HPPA_END_BRTAB                R_END_BRTAB
 230 #define R_HPPA_BEGIN_TRY                R_BEGIN_TRY
 231 #define R_HPPA_END_TRY                  R_END_TRY
 232
 233 /* Exported functions, mostly for use by GAS.  */
 234 bfd_boolean  bfd_som_set_section_attributes    (asection *, int, int, unsigned int, int);
 235 bfd_boolean  bfd_som_set_subsection_attributes (asection *, asection *, int, unsigned int, int, int, int, int);
 236 void         bfd_som_set_symbol_type           (asymbol *, unsigned int);
 237 bfd_boolean  bfd_som_attach_aux_hdr            (bfd *, int, char *);
 238 int **       hppa_som_gen_reloc_type           (bfd *, int, int, enum hppa_reloc_field_selector_type_alt, int, asymbol *);
 239 bfd_boolean  bfd_som_attach_compilation_unit   (bfd *, const char *, const char *, const char *, const char *);
 240 asection *   bfd_section_from_som_symbol       (bfd *abfd, struct som_external_symbol_dictionary_record *symbol);
 241
 242 #ifdef __cplusplus
 243 }
 244 #endif
 245 #endif /* _SOM_H */