bfd/som.h

   1 /* HP PA-RISC SOM object file format:  definitions internal to BFD.
   2    Copyright (C) 1990, 91, 92, 93, 94 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 2 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  22
  23 #ifndef _SOM_H
  24 #define _SOM_H
  25
  26 #include "../bfd/sysdep.h"
  27 #include "libhppa.h"
  28
  29 #include <a.out.h>
  30 #include <lst.h>
  31 #include <ar.h>
  32
  33
  34 #if defined(HOST_HPPABSD) || defined (HOST_HPPAOSF)
  35 /* BSD uses a completely different scheme for object file identification.
  36    so for now, define _PA_RISC_ID to accept any random value for a model
  37    number.  */
  38 #undef _PA_RISC_ID
  39 #define _PA_RISC_ID(__m_num) 1
  40 #endif /* HOST_HPPABSD */
  41
  42 #define FILE_HDR_SIZE sizeof(struct header)
  43 #define AUX_HDR_SIZE sizeof(struct som_exec_auxhdr)
  44
  45 typedef struct som_symbol
  46   {
  47     asymbol symbol;
  48     unsigned int som_type;
  49
  50     /* Structured like the ELF tc_data union.  Allows more code sharing
  51        in GAS this way.  */
  52     union
  53       {
  54         unsigned int hppa_arg_reloc;
  55         PTR any;
  56       }
  57     tc_data;
  58
  59     /* Index of this symbol in the symbol table.  Only used when
  60        building relocation streams for incomplete objects.  */
  61     int index;
  62
  63     /* How many times this symbol is used in a relocation.  By sorting
  64        the symbols from most used to least used we can significantly
  65        reduce the size of the relocation stream for incomplete objects.  */
  66     int reloc_count;
  67   }
  68 som_symbol_type;
  69
  70 /* A structure containing all the magic information stored in a BFD's
  71    private data which needs to be copied during an objcopy/strip run.  */
  72 struct som_exec_data
  73   {
  74     /* Sort-of a magic number.  BSD uses it to distinguish between
  75        native executables and hpux executables.  */
  76     short system_id;
  77
  78     /* Magic exec flags.  These control things like whether or not
  79        null pointer dereferencing is allowed and the like.  */
  80     long exec_flags;
  81
  82     /* Add more stuff here as needed.  Good examples of information
  83        we might want to pass would be presumed_dp, entry_* and maybe
  84        others from the file header.  */
  85   };
  86
  87 struct somdata
  88   {
  89     /* All the magic information about an executable which lives
  90        in the private BFD structure and needs to be copied from
  91        the input bfd to the output bfd during a objcopy/strip.  */
  92     struct som_exec_data *exec_data;
  93
  94     /* These three fields are only used when writing files and are
  95        generated from scratch.  They need not be copied for objcopy
  96        or strip to work.  */
  97     struct header *file_hdr;
  98     struct copyright_aux_hdr *copyright_aux_hdr;
  99     struct user_string_aux_hdr *version_aux_hdr;
 100     struct som_exec_auxhdr *exec_hdr;
 101
 102     /* Pointers to a saved copy of the symbol and string tables.  These
 103        need not be copied for objcopy or strip to work.  */
 104     som_symbol_type *symtab;
 105     char *stringtab;
 106
 107     /* We remember these offsets so that after check_file_format, we have
 108        no dependencies on the particular format of the exec_hdr.
 109        These offsets need not be copied for objcopy or strip to work.  */
 110
 111     file_ptr sym_filepos;
 112     file_ptr str_filepos;
 113     file_ptr reloc_filepos;
 114     unsigned stringtab_size;
 115   };
 116
 117 struct som_data_struct
 118   {
 119     struct somdata a;
 120   };
 121
 122 /* Substructure of som_section_data_struct used to hold information
 123    which can't be represented by the generic BFD section structure,
 124    but which must be copied during objcopy or strip.  */
 125 struct som_copyable_section_data_struct
 126   {
 127     /* Various fields in space and subspace headers that we need
 128        to pass around.  */
 129     unsigned int sort_key : 8;
 130     unsigned int access_control_bits : 7;
 131     unsigned int is_defined : 1;
 132     unsigned int is_private : 1;
 133     unsigned int quadrant : 2;
 134
 135     /* For subspaces, this points to the section which represents the
 136        space in which the subspace is contained.  For spaces it points
 137        back to the section for this space.  */
 138     asection *container;
 139
 140     /* The user-specified space number.  It is wrong to use this as
 141        an index since duplicates and holes are allowed.  */
 142     int space_number;
 143
 144     /* Add more stuff here as needed.  Good examples of information
 145        we might want to pass would be initialization pointers,
 146        and the many subspace flags we do not represent yet.  */
 147   };
 148
 149 /* Used to keep extra SOM specific information for a given section.
 150
 151    reloc_size holds the size of the relocation stream, note this
 152    is very different from the number of relocations as SOM relocations
 153    are variable length.
 154
 155    reloc_stream is the actual stream of relocation entries.  */
 156
 157 struct som_section_data_struct
 158   {
 159     struct som_copyable_section_data_struct *copy_data;
 160     unsigned int reloc_size;
 161     char *reloc_stream;
 162     struct space_dictionary_record *space_dict;
 163     struct subspace_dictionary_record *subspace_dict;
 164   };
 165
 166 #define somdata(bfd)                    ((bfd)->tdata.som_data->a)
 167 #define obj_som_exec_data(bfd)          (somdata(bfd).exec_data)
 168 #define obj_som_file_hdr(bfd)           (somdata(bfd).file_hdr)
 169 #define obj_som_exec_hdr(bfd)           (somdata(bfd).exec_hdr)
 170 #define obj_som_copyright_hdr(bfd)      (somdata(bfd).copyright_aux_hdr)
 171 #define obj_som_version_hdr(bfd)        (somdata(bfd).version_aux_hdr)
 172 #define obj_som_symtab(bfd)             (somdata(bfd).symtab)
 173 #define obj_som_stringtab(bfd)          (somdata(bfd).stringtab)
 174 #define obj_som_sym_filepos(bfd)        (somdata(bfd).sym_filepos)
 175 #define obj_som_str_filepos(bfd)        (somdata(bfd).str_filepos)
 176 #define obj_som_stringtab_size(bfd)     (somdata(bfd).stringtab_size)
 177 #define obj_som_reloc_filepos(bfd)      (somdata(bfd).reloc_filepos)
 178 #define som_section_data(sec) \
 179   ((struct som_section_data_struct *)sec->used_by_bfd)
 180 #define som_symbol_data(symbol)         ((som_symbol_type *) symbol)
 181
 182
 183 /* Defines groups of basic relocations.  FIXME:  These should
 184    be the only basic relocations created by GAS.  The rest
 185    should be internal to the BFD backend.
 186
 187    The idea is both SOM and ELF define these basic relocation
 188    types so they map into a SOM or ELF specific reloation as
 189    appropriate.  This allows GAS to share much more code
 190    between the two object formats.  */
 191
 192 #define R_HPPA_NONE                     R_NO_RELOCATION
 193 #define R_HPPA                          R_CODE_ONE_SYMBOL
 194 #define R_HPPA_PCREL_CALL               R_PCREL_CALL
 195 #define R_HPPA_ABS_CALL                 R_ABS_CALL
 196 #define R_HPPA_GOTOFF                   R_DP_RELATIVE
 197 #define R_HPPA_ENTRY                    R_ENTRY
 198 #define R_HPPA_EXIT                     R_EXIT
 199 #define R_HPPA_COMPLEX                  R_COMP1
 200
 201 /* Exported functions, mostly for use by GAS.  */
 202 boolean bfd_som_set_section_attributes PARAMS ((asection *, int, int,
 203                                                 unsigned int, int));
 204 boolean bfd_som_set_subsection_attributes PARAMS ((asection *, asection *,
 205                                                    int, unsigned int, int));
 206 void bfd_som_set_symbol_type PARAMS ((asymbol *, unsigned int));
 207 boolean bfd_som_attach_aux_hdr PARAMS ((bfd *, int, char *));
 208 int ** hppa_som_gen_reloc_type
 209   PARAMS ((bfd *, int, int, enum hppa_reloc_field_selector_type_alt));
 210 #endif /* _SOM_H */