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, 2007, 2008 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 3 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 "som/aout.h"
  34 #include "som/lst.h"
  35 #include "som/internal.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 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 som_header *file_hdr;
 117   struct som_string_auxhdr *copyright_aux_hdr;
 118   struct som_string_auxhdr *version_aux_hdr;
 119   struct som_exec_auxhdr *exec_hdr;
 120   struct som_compilation_unit *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   void * line_info;
 137 };
 138
 139 struct som_data_struct
 140 {
 141   struct somdata a;
 142 };
 143
 144 /* Substructure of som_section_data_struct used to hold information
 145    which can't be represented by the generic BFD section structure,
 146    but which must be copied during objcopy or strip.  */
 147 struct som_copyable_section_data_struct
 148 {
 149   /* Various fields in space and subspace headers that we need
 150      to pass around.  */
 151   unsigned int sort_key : 8;
 152   unsigned int access_control_bits : 7;
 153   unsigned int is_defined : 1;
 154   unsigned int is_private : 1;
 155   unsigned int quadrant : 2;
 156   unsigned int is_comdat : 1;
 157   unsigned int is_common : 1;
 158   unsigned int dup_common : 1;
 159
 160   /* For subspaces, this points to the section which represents the
 161      space in which the subspace is contained.  For spaces it points
 162      back to the section for this space.  */
 163   asection *container;
 164
 165   /* The user-specified space number.  It is wrong to use this as
 166      an index since duplicates and holes are allowed.  */
 167   int space_number;
 168
 169   /* Add more stuff here as needed.  Good examples of information
 170      we might want to pass would be initialization pointers,
 171      and the many subspace flags we do not represent yet.  */
 172 };
 173
 174 /* Used to keep extra SOM specific information for a given section.
 175
 176    reloc_size holds the size of the relocation stream, note this
 177    is very different from the number of relocations as SOM relocations
 178    are variable length.
 179
 180    reloc_stream is the actual stream of relocation entries.  */
 181
 182 struct som_section_data_struct
 183 {
 184   struct som_copyable_section_data_struct *copy_data;
 185   unsigned int reloc_size;
 186   unsigned char *reloc_stream;
 187   struct som_space_dictionary_record *space_dict;
 188   struct som_subspace_dictionary_record *subspace_dict;
 189 };
 190
 191 #define somdata(bfd)                    ((bfd)->tdata.som_data->a)
 192 #define obj_som_exec_data(bfd)          (somdata (bfd).exec_data)
 193 #define obj_som_file_hdr(bfd)           (somdata (bfd).file_hdr)
 194 #define obj_som_exec_hdr(bfd)           (somdata (bfd).exec_hdr)
 195 #define obj_som_copyright_hdr(bfd)      (somdata (bfd).copyright_aux_hdr)
 196 #define obj_som_version_hdr(bfd)        (somdata (bfd).version_aux_hdr)
 197 #define obj_som_compilation_unit(bfd)   (somdata (bfd).comp_unit)
 198 #define obj_som_symtab(bfd)             (somdata (bfd).symtab)
 199 #define obj_som_stringtab(bfd)          (somdata (bfd).stringtab)
 200 #define obj_som_sym_filepos(bfd)        (somdata (bfd).sym_filepos)
 201 #define obj_som_str_filepos(bfd)        (somdata (bfd).str_filepos)
 202 #define obj_som_stringtab_size(bfd)     (somdata (bfd).stringtab_size)
 203 #define obj_som_reloc_filepos(bfd)      (somdata (bfd).reloc_filepos)
 204 #define obj_som_sorted_syms(bfd)        (somdata (bfd).sorted_syms)
 205 #define som_section_data(sec)      ((struct som_section_data_struct *) sec->used_by_bfd)
 206 #define som_symbol_data(symbol)         ((som_symbol_type *) symbol)
 207
 208 /* Defines groups of basic relocations.  FIXME:  These should
 209    be the only basic relocations created by GAS.  The rest
 210    should be internal to the BFD backend.
 211
 212    The idea is both SOM and ELF define these basic relocation
 213    types so they map into a SOM or ELF specific relocation as
 214    appropriate.  This allows GAS to share much more code
 215    between the two object formats.  */
 216
 217 #define R_HPPA_NONE                     R_NO_RELOCATION
 218 #define R_HPPA                          R_CODE_ONE_SYMBOL
 219 #define R_HPPA_PCREL_CALL               R_PCREL_CALL
 220 #define R_HPPA_ABS_CALL                 R_ABS_CALL
 221 #define R_HPPA_GOTOFF                   R_DP_RELATIVE
 222 #define R_HPPA_ENTRY                    R_ENTRY
 223 #define R_HPPA_EXIT                     R_EXIT
 224 #define R_HPPA_COMPLEX                  R_COMP1
 225 #define R_HPPA_BEGIN_BRTAB              R_BEGIN_BRTAB
 226 #define R_HPPA_END_BRTAB                R_END_BRTAB
 227 #define R_HPPA_BEGIN_TRY                R_BEGIN_TRY
 228 #define R_HPPA_END_TRY                  R_END_TRY
 229
 230 /* Exported functions, mostly for use by GAS.  */
 231 bfd_boolean  bfd_som_set_section_attributes    (asection *, int, int, unsigned int, int);
 232 bfd_boolean  bfd_som_set_subsection_attributes (asection *, asection *, int, unsigned int, int, int, int, int);
 233 void         bfd_som_set_symbol_type           (asymbol *, unsigned int);
 234 bfd_boolean  bfd_som_attach_aux_hdr            (bfd *, int, char *);
 235 int **       hppa_som_gen_reloc_type           (bfd *, int, int, enum hppa_reloc_field_selector_type_alt, int, asymbol *);
 236 bfd_boolean  bfd_som_attach_compilation_unit   (bfd *, const char *, const char *, const char *, const char *);
 237
 238 #endif /* _SOM_H */