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 */ 270