| File: | src/gnu/usr.bin/binutils/gdb/elfread.c |
| Warning: | line 225, column 8 Value stored to 'msym' is never read |
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| 1 | /* Read ELF (Executable and Linking Format) object files for GDB. |
| 2 | |
| 3 | Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
| 4 | 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. |
| 5 | |
| 6 | Written by Fred Fish at Cygnus Support. |
| 7 | |
| 8 | This file is part of GDB. |
| 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., 59 Temple Place - Suite 330, |
| 23 | Boston, MA 02111-1307, USA. */ |
| 24 | |
| 25 | #include "defs.h" |
| 26 | #include "bfd.h" |
| 27 | #include "gdb_string.h" |
| 28 | #include "elf-bfd.h" |
| 29 | #include "elf/mips.h" |
| 30 | #include "symtab.h" |
| 31 | #include "symfile.h" |
| 32 | #include "objfiles.h" |
| 33 | #include "buildsym.h" |
| 34 | #include "stabsread.h" |
| 35 | #include "gdb-stabs.h" |
| 36 | #include "complaints.h" |
| 37 | #include "demangle.h" |
| 38 | |
| 39 | extern void _initialize_elfread (void); |
| 40 | |
| 41 | /* The struct elfinfo is available only during ELF symbol table and |
| 42 | psymtab reading. It is destroyed at the completion of psymtab-reading. |
| 43 | It's local to elf_symfile_read. */ |
| 44 | |
| 45 | struct elfinfo |
| 46 | { |
| 47 | file_ptr dboffset; /* Offset to dwarf debug section */ |
| 48 | unsigned int dbsize; /* Size of dwarf debug section */ |
| 49 | file_ptr lnoffset; /* Offset to dwarf line number section */ |
| 50 | unsigned int lnsize; /* Size of dwarf line number section */ |
| 51 | asection *stabsect; /* Section pointer for .stab section */ |
| 52 | asection *stabindexsect; /* Section pointer for .stab.index section */ |
| 53 | asection *mdebugsect; /* Section pointer for .mdebug section */ |
| 54 | }; |
| 55 | |
| 56 | static void free_elfinfo (void *); |
| 57 | |
| 58 | /* We are called once per section from elf_symfile_read. We |
| 59 | need to examine each section we are passed, check to see |
| 60 | if it is something we are interested in processing, and |
| 61 | if so, stash away some access information for the section. |
| 62 | |
| 63 | For now we recognize the dwarf debug information sections and |
| 64 | line number sections from matching their section names. The |
| 65 | ELF definition is no real help here since it has no direct |
| 66 | knowledge of DWARF (by design, so any debugging format can be |
| 67 | used). |
| 68 | |
| 69 | We also recognize the ".stab" sections used by the Sun compilers |
| 70 | released with Solaris 2. |
| 71 | |
| 72 | FIXME: The section names should not be hardwired strings (what |
| 73 | should they be? I don't think most object file formats have enough |
| 74 | section flags to specify what kind of debug section it is |
| 75 | -kingdon). */ |
| 76 | |
| 77 | static void |
| 78 | elf_locate_sections (bfd *ignore_abfd, asection *sectp, void *eip) |
| 79 | { |
| 80 | struct elfinfo *ei; |
| 81 | |
| 82 | ei = (struct elfinfo *) eip; |
| 83 | if (strcmp (sectp->name, ".debug") == 0) |
| 84 | { |
| 85 | ei->dboffset = sectp->filepos; |
| 86 | ei->dbsize = bfd_get_section_size (sectp)((sectp)->_raw_size); |
| 87 | } |
| 88 | else if (strcmp (sectp->name, ".line") == 0) |
| 89 | { |
| 90 | ei->lnoffset = sectp->filepos; |
| 91 | ei->lnsize = bfd_get_section_size (sectp)((sectp)->_raw_size); |
| 92 | } |
| 93 | else if (strcmp (sectp->name, ".stab") == 0) |
| 94 | { |
| 95 | ei->stabsect = sectp; |
| 96 | } |
| 97 | else if (strcmp (sectp->name, ".stab.index") == 0) |
| 98 | { |
| 99 | ei->stabindexsect = sectp; |
| 100 | } |
| 101 | else if (strcmp (sectp->name, ".mdebug") == 0) |
| 102 | { |
| 103 | ei->mdebugsect = sectp; |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | static struct minimal_symbol * |
| 108 | record_minimal_symbol (char *name, CORE_ADDR address, |
| 109 | enum minimal_symbol_type ms_type, |
| 110 | asection *bfd_section, struct objfile *objfile) |
| 111 | { |
| 112 | if (ms_type == mst_text || ms_type == mst_file_text) |
| 113 | address = SMASH_TEXT_ADDRESS (address)(gdbarch_smash_text_address (current_gdbarch, address)); |
| 114 | |
| 115 | return prim_record_minimal_symbol_and_info |
| 116 | (name, address, ms_type, NULL((void*)0), bfd_section->index, bfd_section, objfile); |
| 117 | } |
| 118 | |
| 119 | /* |
| 120 | |
| 121 | LOCAL FUNCTION |
| 122 | |
| 123 | elf_symtab_read -- read the symbol table of an ELF file |
| 124 | |
| 125 | SYNOPSIS |
| 126 | |
| 127 | void elf_symtab_read (struct objfile *objfile, int dynamic) |
| 128 | |
| 129 | DESCRIPTION |
| 130 | |
| 131 | Given an objfile and a flag that specifies whether or not the objfile |
| 132 | is for an executable or not (may be shared library for example), add |
| 133 | all the global function and data symbols to the minimal symbol table. |
| 134 | |
| 135 | In stabs-in-ELF, as implemented by Sun, there are some local symbols |
| 136 | defined in the ELF symbol table, which can be used to locate |
| 137 | the beginnings of sections from each ".o" file that was linked to |
| 138 | form the executable objfile. We gather any such info and record it |
| 139 | in data structures hung off the objfile's private data. |
| 140 | |
| 141 | */ |
| 142 | |
| 143 | static void |
| 144 | elf_symtab_read (struct objfile *objfile, int dynamic) |
| 145 | { |
| 146 | long storage_needed; |
| 147 | asymbol *sym; |
| 148 | asymbol **symbol_table; |
| 149 | long number_of_symbols; |
| 150 | long i; |
| 151 | struct cleanup *back_to; |
| 152 | CORE_ADDR symaddr; |
| 153 | CORE_ADDR offset; |
| 154 | enum minimal_symbol_type ms_type; |
| 155 | /* If sectinfo is nonNULL, it contains section info that should end up |
| 156 | filed in the objfile. */ |
| 157 | struct stab_section_info *sectinfo = NULL((void*)0); |
| 158 | /* If filesym is nonzero, it points to a file symbol, but we haven't |
| 159 | seen any section info for it yet. */ |
| 160 | asymbol *filesym = 0; |
| 161 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING |
| 162 | /* Name of filesym, as saved on the objfile_obstack. */ |
| 163 | char *filesymname = obsavestring ("", 0, &objfile->objfile_obstack); |
| 164 | #endif |
| 165 | struct dbx_symfile_info *dbx = objfile->sym_stab_info; |
| 166 | int stripped = (bfd_get_symcount (objfile->obfd)((objfile->obfd)->symcount) == 0); |
| 167 | |
| 168 | if (dynamic) |
| 169 | { |
| 170 | storage_needed = bfd_get_dynamic_symtab_upper_bound (objfile->obfd)((*((objfile->obfd)->xvec->_bfd_get_dynamic_symtab_upper_bound )) (objfile->obfd)); |
| 171 | |
| 172 | /* Nothing to be done if there is no dynamic symtab. */ |
| 173 | if (storage_needed < 0) |
| 174 | return; |
| 175 | } |
| 176 | else |
| 177 | { |
| 178 | storage_needed = bfd_get_symtab_upper_bound (objfile->obfd)((*((objfile->obfd)->xvec->_bfd_get_symtab_upper_bound )) (objfile->obfd)); |
| 179 | if (storage_needed < 0) |
| 180 | error ("Can't read symbols from %s: %s", bfd_get_filename (objfile->obfd)((char *) (objfile->obfd)->filename), |
| 181 | bfd_errmsg (bfd_get_error ())); |
| 182 | } |
| 183 | if (storage_needed > 0) |
| 184 | { |
| 185 | symbol_table = (asymbol **) xmalloc (storage_needed); |
| 186 | back_to = make_cleanup (xfree, symbol_table); |
| 187 | if (dynamic) |
| 188 | number_of_symbols = bfd_canonicalize_dynamic_symtab (objfile->obfd,((*((objfile->obfd)->xvec->_bfd_canonicalize_dynamic_symtab )) (objfile->obfd, symbol_table)) |
| 189 | symbol_table)((*((objfile->obfd)->xvec->_bfd_canonicalize_dynamic_symtab )) (objfile->obfd, symbol_table)); |
| 190 | else |
| 191 | number_of_symbols = bfd_canonicalize_symtab (objfile->obfd, symbol_table)((*((objfile->obfd)->xvec->_bfd_canonicalize_symtab) ) (objfile->obfd, symbol_table)); |
| 192 | if (number_of_symbols < 0) |
| 193 | error ("Can't read symbols from %s: %s", bfd_get_filename (objfile->obfd)((char *) (objfile->obfd)->filename), |
| 194 | bfd_errmsg (bfd_get_error ())); |
| 195 | |
| 196 | for (i = 0; i < number_of_symbols; i++) |
| 197 | { |
| 198 | sym = symbol_table[i]; |
| 199 | if (sym->name == NULL((void*)0) || *sym->name == '\0') |
| 200 | { |
| 201 | /* Skip names that don't exist (shouldn't happen), or names |
| 202 | that are null strings (may happen). */ |
| 203 | continue; |
| 204 | } |
| 205 | |
| 206 | offset = ANOFFSET (objfile->section_offsets, sym->section->index)((sym->section->index == -1) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 206, "Section index is uninitialized"), -1) : objfile->section_offsets ->offsets[sym->section->index]); |
| 207 | if (dynamic |
| 208 | && sym->section == &bfd_und_section |
| 209 | && (sym->flags & BSF_FUNCTION0x10)) |
| 210 | { |
| 211 | struct minimal_symbol *msym; |
| 212 | |
| 213 | /* Symbol is a reference to a function defined in |
| 214 | a shared library. |
| 215 | If its value is non zero then it is usually the address |
| 216 | of the corresponding entry in the procedure linkage table, |
| 217 | plus the desired section offset. |
| 218 | If its value is zero then the dynamic linker has to resolve |
| 219 | the symbol. We are unable to find any meaningful address |
| 220 | for this symbol in the executable file, so we skip it. */ |
| 221 | symaddr = sym->value; |
| 222 | if (symaddr == 0) |
| 223 | continue; |
| 224 | symaddr += offset; |
| 225 | msym = record_minimal_symbol |
Value stored to 'msym' is never read | |
| 226 | ((char *) sym->name, symaddr, |
| 227 | mst_solib_trampoline, sym->section, objfile); |
| 228 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING |
| 229 | if (msym != NULL((void*)0)) |
| 230 | msym->filename = filesymname; |
| 231 | #endif |
| 232 | continue; |
| 233 | } |
| 234 | |
| 235 | /* If it is a nonstripped executable, do not enter dynamic |
| 236 | symbols, as the dynamic symbol table is usually a subset |
| 237 | of the main symbol table. */ |
| 238 | if (dynamic && !stripped) |
| 239 | continue; |
| 240 | if (sym->flags & BSF_FILE0x4000) |
| 241 | { |
| 242 | /* STT_FILE debugging symbol that helps stabs-in-elf debugging. |
| 243 | Chain any old one onto the objfile; remember new sym. */ |
| 244 | if (sectinfo != NULL((void*)0)) |
| 245 | { |
| 246 | sectinfo->next = dbx->stab_section_info; |
| 247 | dbx->stab_section_info = sectinfo; |
| 248 | sectinfo = NULL((void*)0); |
| 249 | } |
| 250 | filesym = sym; |
| 251 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING |
| 252 | filesymname = |
| 253 | obsavestring ((char *) filesym->name, strlen (filesym->name), |
| 254 | &objfile->objfile_obstack); |
| 255 | #endif |
| 256 | } |
| 257 | else if (sym->flags & (BSF_GLOBAL0x02 | BSF_LOCAL0x01 | BSF_WEAK0x80)) |
| 258 | { |
| 259 | struct minimal_symbol *msym; |
| 260 | |
| 261 | /* Select global/local/weak symbols. Note that bfd puts abs |
| 262 | symbols in their own section, so all symbols we are |
| 263 | interested in will have a section. */ |
| 264 | /* Bfd symbols are section relative. */ |
| 265 | symaddr = sym->value + sym->section->vma; |
| 266 | /* Relocate all non-absolute symbols by the section offset. */ |
| 267 | if (sym->section != &bfd_abs_section) |
| 268 | { |
| 269 | symaddr += offset; |
| 270 | } |
| 271 | /* For non-absolute symbols, use the type of the section |
| 272 | they are relative to, to intuit text/data. Bfd provides |
| 273 | no way of figuring this out for absolute symbols. */ |
| 274 | if (sym->section == &bfd_abs_section) |
| 275 | { |
| 276 | /* This is a hack to get the minimal symbol type |
| 277 | right for Irix 5, which has absolute addresses |
| 278 | with special section indices for dynamic symbols. */ |
| 279 | unsigned short shndx = |
| 280 | ((elf_symbol_type *) sym)->internal_elf_sym.st_shndx; |
| 281 | |
| 282 | switch (shndx) |
| 283 | { |
| 284 | case SHN_MIPS_TEXT0xff01: |
| 285 | ms_type = mst_text; |
| 286 | break; |
| 287 | case SHN_MIPS_DATA0xff02: |
| 288 | ms_type = mst_data; |
| 289 | break; |
| 290 | case SHN_MIPS_ACOMMON0xff00: |
| 291 | ms_type = mst_bss; |
| 292 | break; |
| 293 | default: |
| 294 | ms_type = mst_abs; |
| 295 | } |
| 296 | |
| 297 | /* If it is an Irix dynamic symbol, skip section name |
| 298 | symbols, relocate all others by section offset. */ |
| 299 | if (ms_type != mst_abs) |
| 300 | { |
| 301 | if (sym->name[0] == '.') |
| 302 | continue; |
| 303 | symaddr += offset; |
| 304 | } |
| 305 | } |
| 306 | else if (sym->section->flags & SEC_CODE0x020) |
| 307 | { |
| 308 | if (sym->flags & BSF_GLOBAL0x02) |
| 309 | { |
| 310 | ms_type = mst_text; |
| 311 | } |
| 312 | else if ((sym->name[0] == '.' && sym->name[1] == 'L') |
| 313 | || ((sym->flags & BSF_LOCAL0x01) |
| 314 | && sym->name[0] == '$' |
| 315 | && sym->name[1] == 'L')) |
| 316 | /* Looks like a compiler-generated label. Skip |
| 317 | it. The assembler should be skipping these (to |
| 318 | keep executables small), but apparently with |
| 319 | gcc on the (deleted) delta m88k SVR4, it loses. |
| 320 | So to have us check too should be harmless (but |
| 321 | I encourage people to fix this in the assembler |
| 322 | instead of adding checks here). */ |
| 323 | continue; |
| 324 | else |
| 325 | { |
| 326 | ms_type = mst_file_text; |
| 327 | } |
| 328 | } |
| 329 | else if (sym->section->flags & SEC_ALLOC0x001) |
| 330 | { |
| 331 | if (sym->flags & (BSF_GLOBAL0x02 | BSF_WEAK0x80)) |
| 332 | { |
| 333 | if (sym->section->flags & SEC_LOAD0x002) |
| 334 | { |
| 335 | ms_type = mst_data; |
| 336 | } |
| 337 | else |
| 338 | { |
| 339 | ms_type = mst_bss; |
| 340 | } |
| 341 | } |
| 342 | else if (sym->flags & BSF_LOCAL0x01) |
| 343 | { |
| 344 | /* Named Local variable in a Data section. |
| 345 | Check its name for stabs-in-elf. */ |
| 346 | int special_local_sect; |
| 347 | if (strcmp ("Bbss.bss", sym->name) == 0) |
| 348 | special_local_sect = SECT_OFF_BSS (objfile)(objfile)->sect_index_bss; |
| 349 | else if (strcmp ("Ddata.data", sym->name) == 0) |
| 350 | special_local_sect = SECT_OFF_DATA (objfile)((objfile->sect_index_data == -1) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 350, "sect_index_data not initialized"), -1) : objfile-> sect_index_data); |
| 351 | else if (strcmp ("Drodata.rodata", sym->name) == 0) |
| 352 | special_local_sect = SECT_OFF_RODATA (objfile)((objfile->sect_index_rodata == -1) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 352, "sect_index_rodata not initialized"), -1) : objfile-> sect_index_rodata); |
| 353 | else |
| 354 | special_local_sect = -1; |
| 355 | if (special_local_sect >= 0) |
| 356 | { |
| 357 | /* Found a special local symbol. Allocate a |
| 358 | sectinfo, if needed, and fill it in. */ |
| 359 | if (sectinfo == NULL((void*)0)) |
| 360 | { |
| 361 | int max_index; |
| 362 | size_t size; |
| 363 | |
| 364 | max_index |
| 365 | = max (SECT_OFF_BSS (objfile),(((objfile)->sect_index_bss) > (((((objfile->sect_index_data == -1) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 366, "sect_index_data not initialized"), -1) : objfile-> sect_index_data)) > (((objfile->sect_index_rodata == -1 ) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 367, "sect_index_rodata not initialized"), -1) : objfile-> sect_index_rodata)) ? (((objfile->sect_index_data == -1) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 366, "sect_index_data not initialized"), -1) : objfile-> sect_index_data)) : (((objfile->sect_index_rodata == -1) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 367, "sect_index_rodata not initialized"), -1) : objfile-> sect_index_rodata)))) ? ((objfile)->sect_index_bss) : (((( (objfile->sect_index_data == -1) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 366, "sect_index_data not initialized"), -1) : objfile-> sect_index_data)) > (((objfile->sect_index_rodata == -1 ) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 367, "sect_index_rodata not initialized"), -1) : objfile-> sect_index_rodata)) ? (((objfile->sect_index_data == -1) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 366, "sect_index_data not initialized"), -1) : objfile-> sect_index_data)) : (((objfile->sect_index_rodata == -1) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 367, "sect_index_rodata not initialized"), -1) : objfile-> sect_index_rodata))))) |
| 366 | max (SECT_OFF_DATA (objfile),(((objfile)->sect_index_bss) > (((((objfile->sect_index_data == -1) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 366, "sect_index_data not initialized"), -1) : objfile-> sect_index_data)) > (((objfile->sect_index_rodata == -1 ) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 367, "sect_index_rodata not initialized"), -1) : objfile-> sect_index_rodata)) ? (((objfile->sect_index_data == -1) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 366, "sect_index_data not initialized"), -1) : objfile-> sect_index_data)) : (((objfile->sect_index_rodata == -1) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 367, "sect_index_rodata not initialized"), -1) : objfile-> sect_index_rodata)))) ? ((objfile)->sect_index_bss) : (((( (objfile->sect_index_data == -1) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 366, "sect_index_data not initialized"), -1) : objfile-> sect_index_data)) > (((objfile->sect_index_rodata == -1 ) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 367, "sect_index_rodata not initialized"), -1) : objfile-> sect_index_rodata)) ? (((objfile->sect_index_data == -1) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 366, "sect_index_data not initialized"), -1) : objfile-> sect_index_data)) : (((objfile->sect_index_rodata == -1) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 367, "sect_index_rodata not initialized"), -1) : objfile-> sect_index_rodata))))) |
| 367 | SECT_OFF_RODATA (objfile)))(((objfile)->sect_index_bss) > (((((objfile->sect_index_data == -1) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 366, "sect_index_data not initialized"), -1) : objfile-> sect_index_data)) > (((objfile->sect_index_rodata == -1 ) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 367, "sect_index_rodata not initialized"), -1) : objfile-> sect_index_rodata)) ? (((objfile->sect_index_data == -1) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 366, "sect_index_data not initialized"), -1) : objfile-> sect_index_data)) : (((objfile->sect_index_rodata == -1) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 367, "sect_index_rodata not initialized"), -1) : objfile-> sect_index_rodata)))) ? ((objfile)->sect_index_bss) : (((( (objfile->sect_index_data == -1) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 366, "sect_index_data not initialized"), -1) : objfile-> sect_index_data)) > (((objfile->sect_index_rodata == -1 ) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 367, "sect_index_rodata not initialized"), -1) : objfile-> sect_index_rodata)) ? (((objfile->sect_index_data == -1) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 366, "sect_index_data not initialized"), -1) : objfile-> sect_index_data)) : (((objfile->sect_index_rodata == -1) ? (internal_error ("/usr/src/gnu/usr.bin/binutils/gdb/elfread.c" , 367, "sect_index_rodata not initialized"), -1) : objfile-> sect_index_rodata))))); |
| 368 | |
| 369 | /* max_index is the largest index we'll |
| 370 | use into this array, so we must |
| 371 | allocate max_index+1 elements for it. |
| 372 | However, 'struct stab_section_info' |
| 373 | already includes one element, so we |
| 374 | need to allocate max_index aadditional |
| 375 | elements. */ |
| 376 | size = (sizeof (struct stab_section_info) |
| 377 | + (sizeof (CORE_ADDR) |
| 378 | * max_index)); |
| 379 | sectinfo = (struct stab_section_info *) |
| 380 | xmalloc (size); |
| 381 | memset (sectinfo, 0, size); |
| 382 | sectinfo->num_sections = max_index; |
| 383 | if (filesym == NULL((void*)0)) |
| 384 | { |
| 385 | complaint (&symfile_complaints, |
| 386 | "elf/stab section information %s without a preceding file symbol", |
| 387 | sym->name); |
| 388 | } |
| 389 | else |
| 390 | { |
| 391 | sectinfo->filename = |
| 392 | (char *) filesym->name; |
| 393 | } |
| 394 | } |
| 395 | if (sectinfo->sections[special_local_sect] != 0) |
| 396 | complaint (&symfile_complaints, |
| 397 | "duplicated elf/stab section information for %s", |
| 398 | sectinfo->filename); |
| 399 | /* BFD symbols are section relative. */ |
| 400 | symaddr = sym->value + sym->section->vma; |
| 401 | /* Relocate non-absolute symbols by the |
| 402 | section offset. */ |
| 403 | if (sym->section != &bfd_abs_section) |
| 404 | symaddr += offset; |
| 405 | sectinfo->sections[special_local_sect] = symaddr; |
| 406 | /* The special local symbols don't go in the |
| 407 | minimal symbol table, so ignore this one. */ |
| 408 | continue; |
| 409 | } |
| 410 | /* Not a special stabs-in-elf symbol, do regular |
| 411 | symbol processing. */ |
| 412 | if (sym->section->flags & SEC_LOAD0x002) |
| 413 | { |
| 414 | ms_type = mst_file_data; |
| 415 | } |
| 416 | else |
| 417 | { |
| 418 | ms_type = mst_file_bss; |
| 419 | } |
| 420 | } |
| 421 | else |
| 422 | { |
| 423 | ms_type = mst_unknown; |
| 424 | } |
| 425 | } |
| 426 | else |
| 427 | { |
| 428 | /* FIXME: Solaris2 shared libraries include lots of |
| 429 | odd "absolute" and "undefined" symbols, that play |
| 430 | hob with actions like finding what function the PC |
| 431 | is in. Ignore them if they aren't text, data, or bss. */ |
| 432 | /* ms_type = mst_unknown; */ |
| 433 | continue; /* Skip this symbol. */ |
| 434 | } |
| 435 | msym = record_minimal_symbol |
| 436 | ((char *) sym->name, symaddr, |
| 437 | ms_type, sym->section, objfile); |
| 438 | if (msym) |
| 439 | { |
| 440 | /* Pass symbol size field in via BFD. FIXME!!! */ |
| 441 | unsigned long size = ((elf_symbol_type *) sym)->internal_elf_sym.st_size; |
| 442 | MSYMBOL_SIZE(msym)(msym)->size = size; |
| 443 | } |
| 444 | #ifdef SOFUN_ADDRESS_MAYBE_MISSING |
| 445 | if (msym != NULL((void*)0)) |
| 446 | msym->filename = filesymname; |
| 447 | #endif |
| 448 | ELF_MAKE_MSYMBOL_SPECIAL (sym, msym)(gdbarch_elf_make_msymbol_special (current_gdbarch, sym, msym )); |
| 449 | } |
| 450 | } |
| 451 | do_cleanups (back_to); |
| 452 | } |
| 453 | } |
| 454 | |
| 455 | /* Scan and build partial symbols for a symbol file. |
| 456 | We have been initialized by a call to elf_symfile_init, which |
| 457 | currently does nothing. |
| 458 | |
| 459 | SECTION_OFFSETS is a set of offsets to apply to relocate the symbols |
| 460 | in each section. We simplify it down to a single offset for all |
| 461 | symbols. FIXME. |
| 462 | |
| 463 | MAINLINE is true if we are reading the main symbol |
| 464 | table (as opposed to a shared lib or dynamically loaded file). |
| 465 | |
| 466 | This function only does the minimum work necessary for letting the |
| 467 | user "name" things symbolically; it does not read the entire symtab. |
| 468 | Instead, it reads the external and static symbols and puts them in partial |
| 469 | symbol tables. When more extensive information is requested of a |
| 470 | file, the corresponding partial symbol table is mutated into a full |
| 471 | fledged symbol table by going back and reading the symbols |
| 472 | for real. |
| 473 | |
| 474 | We look for sections with specific names, to tell us what debug |
| 475 | format to look for: FIXME!!! |
| 476 | |
| 477 | dwarf_build_psymtabs() builds psymtabs for DWARF symbols; |
| 478 | elfstab_build_psymtabs() handles STABS symbols; |
| 479 | mdebug_build_psymtabs() handles ECOFF debugging information. |
| 480 | |
| 481 | Note that ELF files have a "minimal" symbol table, which looks a lot |
| 482 | like a COFF symbol table, but has only the minimal information necessary |
| 483 | for linking. We process this also, and use the information to |
| 484 | build gdb's minimal symbol table. This gives us some minimal debugging |
| 485 | capability even for files compiled without -g. */ |
| 486 | |
| 487 | static void |
| 488 | elf_symfile_read (struct objfile *objfile, int mainline) |
| 489 | { |
| 490 | bfd *abfd = objfile->obfd; |
| 491 | struct elfinfo ei; |
| 492 | struct cleanup *back_to; |
| 493 | CORE_ADDR offset; |
| 494 | |
| 495 | init_minimal_symbol_collection (); |
| 496 | back_to = make_cleanup_discard_minimal_symbols (); |
| 497 | |
| 498 | memset ((char *) &ei, 0, sizeof (ei)); |
| 499 | |
| 500 | /* Allocate struct to keep track of the symfile */ |
| 501 | objfile->sym_stab_info = (struct dbx_symfile_info *) |
| 502 | xmalloc (sizeof (struct dbx_symfile_info)); |
| 503 | memset ((char *) objfile->sym_stab_info, 0, sizeof (struct dbx_symfile_info)); |
| 504 | make_cleanup (free_elfinfo, (void *) objfile); |
| 505 | |
| 506 | /* Process the normal ELF symbol table first. This may write some |
| 507 | chain of info into the dbx_symfile_info in objfile->sym_stab_info, |
| 508 | which can later be used by elfstab_offset_sections. */ |
| 509 | |
| 510 | elf_symtab_read (objfile, 0); |
| 511 | |
| 512 | /* Add the dynamic symbols. */ |
| 513 | |
| 514 | elf_symtab_read (objfile, 1); |
| 515 | |
| 516 | /* Install any minimal symbols that have been collected as the current |
| 517 | minimal symbols for this objfile. The debug readers below this point |
| 518 | should not generate new minimal symbols; if they do it's their |
| 519 | responsibility to install them. "mdebug" appears to be the only one |
| 520 | which will do this. */ |
| 521 | |
| 522 | install_minimal_symbols (objfile); |
| 523 | do_cleanups (back_to); |
| 524 | |
| 525 | /* Now process debugging information, which is contained in |
| 526 | special ELF sections. */ |
| 527 | |
| 528 | /* If we are reinitializing, or if we have never loaded syms yet, |
| 529 | set table to empty. MAINLINE is cleared so that *_read_psymtab |
| 530 | functions do not all also re-initialize the psymbol table. */ |
| 531 | if (mainline) |
| 532 | { |
| 533 | init_psymbol_list (objfile, 0); |
| 534 | mainline = 0; |
| 535 | } |
| 536 | |
| 537 | /* We first have to find them... */ |
| 538 | bfd_map_over_sections (abfd, elf_locate_sections, (void *) & ei); |
| 539 | |
| 540 | /* ELF debugging information is inserted into the psymtab in the |
| 541 | order of least informative first - most informative last. Since |
| 542 | the psymtab table is searched `most recent insertion first' this |
| 543 | increases the probability that more detailed debug information |
| 544 | for a section is found. |
| 545 | |
| 546 | For instance, an object file might contain both .mdebug (XCOFF) |
| 547 | and .debug_info (DWARF2) sections then .mdebug is inserted first |
| 548 | (searched last) and DWARF2 is inserted last (searched first). If |
| 549 | we don't do this then the XCOFF info is found first - for code in |
| 550 | an included file XCOFF info is useless. */ |
| 551 | |
| 552 | if (ei.mdebugsect) |
| 553 | { |
| 554 | const struct ecoff_debug_swap *swap; |
| 555 | |
| 556 | /* .mdebug section, presumably holding ECOFF debugging |
| 557 | information. */ |
| 558 | swap = get_elf_backend_data (abfd)((const struct elf_backend_data *) (abfd)->xvec->backend_data )->elf_backend_ecoff_debug_swap; |
| 559 | if (swap) |
| 560 | elfmdebug_build_psymtabs (objfile, swap, ei.mdebugsect); |
| 561 | } |
| 562 | if (ei.stabsect) |
| 563 | { |
| 564 | asection *str_sect; |
| 565 | |
| 566 | /* Stab sections have an associated string table that looks like |
| 567 | a separate section. */ |
| 568 | str_sect = bfd_get_section_by_name (abfd, ".stabstr"); |
| 569 | |
| 570 | /* FIXME should probably warn about a stab section without a stabstr. */ |
| 571 | if (str_sect) |
| 572 | elfstab_build_psymtabs (objfile, |
| 573 | mainline, |
| 574 | ei.stabsect, |
| 575 | str_sect->filepos, |
| 576 | bfd_section_size (abfd, str_sect)((str_sect)->_raw_size)); |
| 577 | } |
| 578 | if (dwarf2_has_info (objfile)) |
| 579 | { |
| 580 | /* DWARF 2 sections */ |
| 581 | dwarf2_build_psymtabs (objfile, mainline); |
| 582 | } |
| 583 | else if (ei.dboffset && ei.lnoffset) |
| 584 | { |
| 585 | /* DWARF sections */ |
| 586 | dwarf_build_psymtabs (objfile, |
| 587 | mainline, |
| 588 | ei.dboffset, ei.dbsize, |
| 589 | ei.lnoffset, ei.lnsize); |
| 590 | } |
| 591 | |
| 592 | /* FIXME: kettenis/20030504: This still needs to be integrated with |
| 593 | dwarf2read.c in a better way. */ |
| 594 | dwarf2_build_frame_info (objfile); |
| 595 | } |
| 596 | |
| 597 | /* This cleans up the objfile's sym_stab_info pointer, and the chain of |
| 598 | stab_section_info's, that might be dangling from it. */ |
| 599 | |
| 600 | static void |
| 601 | free_elfinfo (void *objp) |
| 602 | { |
| 603 | struct objfile *objfile = (struct objfile *) objp; |
| 604 | struct dbx_symfile_info *dbxinfo = objfile->sym_stab_info; |
| 605 | struct stab_section_info *ssi, *nssi; |
| 606 | |
| 607 | ssi = dbxinfo->stab_section_info; |
| 608 | while (ssi) |
| 609 | { |
| 610 | nssi = ssi->next; |
| 611 | xfree (ssi); |
| 612 | ssi = nssi; |
| 613 | } |
| 614 | |
| 615 | dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */ |
| 616 | } |
| 617 | |
| 618 | |
| 619 | /* Initialize anything that needs initializing when a completely new symbol |
| 620 | file is specified (not just adding some symbols from another file, e.g. a |
| 621 | shared library). |
| 622 | |
| 623 | We reinitialize buildsym, since we may be reading stabs from an ELF file. */ |
| 624 | |
| 625 | static void |
| 626 | elf_new_init (struct objfile *ignore) |
| 627 | { |
| 628 | stabsread_new_init (); |
| 629 | buildsym_new_init (); |
| 630 | } |
| 631 | |
| 632 | /* Perform any local cleanups required when we are done with a particular |
| 633 | objfile. I.E, we are in the process of discarding all symbol information |
| 634 | for an objfile, freeing up all memory held for it, and unlinking the |
| 635 | objfile struct from the global list of known objfiles. */ |
| 636 | |
| 637 | static void |
| 638 | elf_symfile_finish (struct objfile *objfile) |
| 639 | { |
| 640 | if (objfile->sym_stab_info != NULL((void*)0)) |
| 641 | { |
| 642 | xfree (objfile->sym_stab_info); |
| 643 | } |
| 644 | } |
| 645 | |
| 646 | /* ELF specific initialization routine for reading symbols. |
| 647 | |
| 648 | It is passed a pointer to a struct sym_fns which contains, among other |
| 649 | things, the BFD for the file whose symbols are being read, and a slot for |
| 650 | a pointer to "private data" which we can fill with goodies. |
| 651 | |
| 652 | For now at least, we have nothing in particular to do, so this function is |
| 653 | just a stub. */ |
| 654 | |
| 655 | static void |
| 656 | elf_symfile_init (struct objfile *objfile) |
| 657 | { |
| 658 | /* ELF objects may be reordered, so set OBJF_REORDERED. If we |
| 659 | find this causes a significant slowdown in gdb then we could |
| 660 | set it in the debug symbol readers only when necessary. */ |
| 661 | objfile->flags |= OBJF_REORDERED(1 << 2); |
| 662 | } |
| 663 | |
| 664 | /* When handling an ELF file that contains Sun STABS debug info, |
| 665 | some of the debug info is relative to the particular chunk of the |
| 666 | section that was generated in its individual .o file. E.g. |
| 667 | offsets to static variables are relative to the start of the data |
| 668 | segment *for that module before linking*. This information is |
| 669 | painfully squirreled away in the ELF symbol table as local symbols |
| 670 | with wierd names. Go get 'em when needed. */ |
| 671 | |
| 672 | void |
| 673 | elfstab_offset_sections (struct objfile *objfile, struct partial_symtab *pst) |
| 674 | { |
| 675 | char *filename = pst->filename; |
| 676 | struct dbx_symfile_info *dbx = objfile->sym_stab_info; |
| 677 | struct stab_section_info *maybe = dbx->stab_section_info; |
| 678 | struct stab_section_info *questionable = 0; |
| 679 | int i; |
| 680 | char *p; |
| 681 | |
| 682 | /* The ELF symbol info doesn't include path names, so strip the path |
| 683 | (if any) from the psymtab filename. */ |
| 684 | while (0 != (p = strchr (filename, '/'))) |
| 685 | filename = p + 1; |
| 686 | |
| 687 | /* FIXME: This linear search could speed up significantly |
| 688 | if it was chained in the right order to match how we search it, |
| 689 | and if we unchained when we found a match. */ |
| 690 | for (; maybe; maybe = maybe->next) |
| 691 | { |
| 692 | if (filename[0] == maybe->filename[0] |
| 693 | && strcmp (filename, maybe->filename) == 0) |
| 694 | { |
| 695 | /* We found a match. But there might be several source files |
| 696 | (from different directories) with the same name. */ |
| 697 | if (0 == maybe->found) |
| 698 | break; |
| 699 | questionable = maybe; /* Might use it later. */ |
| 700 | } |
| 701 | } |
| 702 | |
| 703 | if (maybe == 0 && questionable != 0) |
| 704 | { |
| 705 | complaint (&symfile_complaints, |
| 706 | "elf/stab section information questionable for %s", filename); |
| 707 | maybe = questionable; |
| 708 | } |
| 709 | |
| 710 | if (maybe) |
| 711 | { |
| 712 | /* Found it! Allocate a new psymtab struct, and fill it in. */ |
| 713 | maybe->found++; |
| 714 | pst->section_offsets = (struct section_offsets *) |
| 715 | obstack_alloc (&objfile->objfile_obstack,__extension__ ({ struct obstack *__h = (&objfile->objfile_obstack ); __extension__ ({ struct obstack *__o = (__h); int __len = ( ((sizeof (struct section_offsets) + sizeof (((struct section_offsets *) 0)->offsets) * ((objfile->num_sections)-1)))); if ( __o->chunk_limit - __o->next_free < __len) _obstack_newchunk (__o, __len); ((__o)->next_free += (__len)); (void) 0; }) ; __extension__ ({ struct obstack *__o1 = (__h); void *value; value = (void *) __o1->object_base; if (__o1->next_free == value) __o1->maybe_empty_object = 1; __o1->next_free = (((((__o1->next_free) - (char *) 0)+__o1->alignment_mask ) & ~ (__o1->alignment_mask)) + (char *) 0); if (__o1-> next_free - (char *)__o1->chunk > __o1->chunk_limit - (char *)__o1->chunk) __o1->next_free = __o1->chunk_limit ; __o1->object_base = __o1->next_free; value; }); }) |
| 716 | SIZEOF_N_SECTION_OFFSETS (objfile->num_sections))__extension__ ({ struct obstack *__h = (&objfile->objfile_obstack ); __extension__ ({ struct obstack *__o = (__h); int __len = ( ((sizeof (struct section_offsets) + sizeof (((struct section_offsets *) 0)->offsets) * ((objfile->num_sections)-1)))); if ( __o->chunk_limit - __o->next_free < __len) _obstack_newchunk (__o, __len); ((__o)->next_free += (__len)); (void) 0; }) ; __extension__ ({ struct obstack *__o1 = (__h); void *value; value = (void *) __o1->object_base; if (__o1->next_free == value) __o1->maybe_empty_object = 1; __o1->next_free = (((((__o1->next_free) - (char *) 0)+__o1->alignment_mask ) & ~ (__o1->alignment_mask)) + (char *) 0); if (__o1-> next_free - (char *)__o1->chunk > __o1->chunk_limit - (char *)__o1->chunk) __o1->next_free = __o1->chunk_limit ; __o1->object_base = __o1->next_free; value; }); }); |
| 717 | for (i = 0; i < maybe->num_sections; i++) |
| 718 | (pst->section_offsets)->offsets[i] = maybe->sections[i]; |
| 719 | return; |
| 720 | } |
| 721 | |
| 722 | /* We were unable to find any offsets for this file. Complain. */ |
| 723 | if (dbx->stab_section_info) /* If there *is* any info, */ |
| 724 | complaint (&symfile_complaints, |
| 725 | "elf/stab section information missing for %s", filename); |
| 726 | } |
| 727 | |
| 728 | /* Register that we are able to handle ELF object file formats. */ |
| 729 | |
| 730 | static struct sym_fns elf_sym_fns = |
| 731 | { |
| 732 | bfd_target_elf_flavour, |
| 733 | elf_new_init, /* sym_new_init: init anything gbl to entire symtab */ |
| 734 | elf_symfile_init, /* sym_init: read initial info, setup for sym_read() */ |
| 735 | elf_symfile_read, /* sym_read: read a symbol file into symtab */ |
| 736 | elf_symfile_finish, /* sym_finish: finished with file, cleanup */ |
| 737 | default_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */ |
| 738 | NULL((void*)0) /* next: pointer to next struct sym_fns */ |
| 739 | }; |
| 740 | |
| 741 | void |
| 742 | _initialize_elfread (void) |
| 743 | { |
| 744 | add_symtab_fns (&elf_sym_fns); |
| 745 | } |