| /* Read ELF (Executable and Linking Format) object files for GDB. |
| Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, |
| 2001, 2002 |
| Free Software Foundation, Inc. |
| Written by Fred Fish at Cygnus Support. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include "defs.h" |
| #include "bfd.h" |
| #include "gdb_string.h" |
| #include "elf-bfd.h" |
| #include "elf/mips.h" |
| #include "symtab.h" |
| #include "symfile.h" |
| #include "objfiles.h" |
| #include "buildsym.h" |
| #include "stabsread.h" |
| #include "gdb-stabs.h" |
| #include "complaints.h" |
| #include "demangle.h" |
| |
| extern void _initialize_elfread (void); |
| |
| /* The struct elfinfo is available only during ELF symbol table and |
| psymtab reading. It is destroyed at the completion of psymtab-reading. |
| It's local to elf_symfile_read. */ |
| |
| struct elfinfo |
| { |
| file_ptr dboffset; /* Offset to dwarf debug section */ |
| unsigned int dbsize; /* Size of dwarf debug section */ |
| file_ptr lnoffset; /* Offset to dwarf line number section */ |
| unsigned int lnsize; /* Size of dwarf line number section */ |
| asection *stabsect; /* Section pointer for .stab section */ |
| asection *stabindexsect; /* Section pointer for .stab.index section */ |
| asection *mdebugsect; /* Section pointer for .mdebug section */ |
| }; |
| |
| /* Various things we might complain about... */ |
| |
| struct complaint section_info_complaint = |
| {"elf/stab section information %s without a preceding file symbol", 0, 0}; |
| |
| struct complaint section_info_dup_complaint = |
| {"duplicated elf/stab section information for %s", 0, 0}; |
| |
| struct complaint stab_info_mismatch_complaint = |
| {"elf/stab section information missing for %s", 0, 0}; |
| |
| struct complaint stab_info_questionable_complaint = |
| {"elf/stab section information questionable for %s", 0, 0}; |
| |
| static void free_elfinfo (void *); |
| |
| /* We are called once per section from elf_symfile_read. We |
| need to examine each section we are passed, check to see |
| if it is something we are interested in processing, and |
| if so, stash away some access information for the section. |
| |
| For now we recognize the dwarf debug information sections and |
| line number sections from matching their section names. The |
| ELF definition is no real help here since it has no direct |
| knowledge of DWARF (by design, so any debugging format can be |
| used). |
| |
| We also recognize the ".stab" sections used by the Sun compilers |
| released with Solaris 2. |
| |
| FIXME: The section names should not be hardwired strings (what |
| should they be? I don't think most object file formats have enough |
| section flags to specify what kind of debug section it is |
| -kingdon). */ |
| |
| static void |
| elf_locate_sections (bfd *ignore_abfd, asection *sectp, void *eip) |
| { |
| register struct elfinfo *ei; |
| |
| ei = (struct elfinfo *) eip; |
| if (STREQ (sectp->name, ".debug")) |
| { |
| ei->dboffset = sectp->filepos; |
| ei->dbsize = bfd_get_section_size_before_reloc (sectp); |
| } |
| else if (STREQ (sectp->name, ".line")) |
| { |
| ei->lnoffset = sectp->filepos; |
| ei->lnsize = bfd_get_section_size_before_reloc (sectp); |
| } |
| else if (STREQ (sectp->name, ".stab")) |
| { |
| ei->stabsect = sectp; |
| } |
| else if (STREQ (sectp->name, ".stab.index")) |
| { |
| ei->stabindexsect = sectp; |
| } |
| else if (STREQ (sectp->name, ".mdebug")) |
| { |
| ei->mdebugsect = sectp; |
| } |
| } |
| |
| #if 0 /* Currently unused */ |
| |
| char * |
| elf_interpreter (bfd *abfd) |
| { |
| sec_ptr interp_sec; |
| unsigned size; |
| char *interp = NULL; |
| |
| interp_sec = bfd_get_section_by_name (abfd, ".interp"); |
| if (interp_sec) |
| { |
| size = bfd_section_size (abfd, interp_sec); |
| interp = alloca (size); |
| if (bfd_get_section_contents (abfd, interp_sec, interp, (file_ptr) 0, |
| size)) |
| { |
| interp = savestring (interp, size - 1); |
| } |
| else |
| { |
| interp = NULL; |
| } |
| } |
| return (interp); |
| } |
| |
| #endif |
| |
| static struct minimal_symbol * |
| record_minimal_symbol_and_info (char *name, CORE_ADDR address, |
| enum minimal_symbol_type ms_type, char *info, /* FIXME, is this really char *? */ |
| asection *bfd_section, struct objfile *objfile) |
| { |
| if (ms_type == mst_text || ms_type == mst_file_text) |
| address = SMASH_TEXT_ADDRESS (address); |
| |
| return prim_record_minimal_symbol_and_info |
| (name, address, ms_type, info, bfd_section->index, bfd_section, objfile); |
| } |
| |
| /* |
| |
| LOCAL FUNCTION |
| |
| elf_symtab_read -- read the symbol table of an ELF file |
| |
| SYNOPSIS |
| |
| void elf_symtab_read (struct objfile *objfile, int dynamic) |
| |
| DESCRIPTION |
| |
| Given an objfile and a flag that specifies whether or not the objfile |
| is for an executable or not (may be shared library for example), add |
| all the global function and data symbols to the minimal symbol table. |
| |
| In stabs-in-ELF, as implemented by Sun, there are some local symbols |
| defined in the ELF symbol table, which can be used to locate |
| the beginnings of sections from each ".o" file that was linked to |
| form the executable objfile. We gather any such info and record it |
| in data structures hung off the objfile's private data. |
| |
| */ |
| |
| static void |
| elf_symtab_read (struct objfile *objfile, int dynamic) |
| { |
| long storage_needed; |
| asymbol *sym; |
| asymbol **symbol_table; |
| long number_of_symbols; |
| long i; |
| int index; |
| struct cleanup *back_to; |
| CORE_ADDR symaddr; |
| CORE_ADDR offset; |
| enum minimal_symbol_type ms_type; |
| /* If sectinfo is nonNULL, it contains section info that should end up |
| filed in the objfile. */ |
| struct stab_section_info *sectinfo = NULL; |
| /* If filesym is nonzero, it points to a file symbol, but we haven't |
| seen any section info for it yet. */ |
| asymbol *filesym = 0; |
| #ifdef SOFUN_ADDRESS_MAYBE_MISSING |
| /* Name of filesym, as saved on the symbol_obstack. */ |
| char *filesymname = obsavestring ("", 0, &objfile->symbol_obstack); |
| #endif |
| struct dbx_symfile_info *dbx = objfile->sym_stab_info; |
| unsigned long size; |
| int stripped = (bfd_get_symcount (objfile->obfd) == 0); |
| |
| if (dynamic) |
| { |
| storage_needed = bfd_get_dynamic_symtab_upper_bound (objfile->obfd); |
| |
| /* Nothing to be done if there is no dynamic symtab. */ |
| if (storage_needed < 0) |
| return; |
| } |
| else |
| { |
| storage_needed = bfd_get_symtab_upper_bound (objfile->obfd); |
| if (storage_needed < 0) |
| error ("Can't read symbols from %s: %s", bfd_get_filename (objfile->obfd), |
| bfd_errmsg (bfd_get_error ())); |
| } |
| if (storage_needed > 0) |
| { |
| symbol_table = (asymbol **) xmalloc (storage_needed); |
| back_to = make_cleanup (xfree, symbol_table); |
| if (dynamic) |
| number_of_symbols = bfd_canonicalize_dynamic_symtab (objfile->obfd, |
| symbol_table); |
| else |
| number_of_symbols = bfd_canonicalize_symtab (objfile->obfd, symbol_table); |
| if (number_of_symbols < 0) |
| error ("Can't read symbols from %s: %s", bfd_get_filename (objfile->obfd), |
| bfd_errmsg (bfd_get_error ())); |
| |
| for (i = 0; i < number_of_symbols; i++) |
| { |
| sym = symbol_table[i]; |
| if (sym->name == NULL || *sym->name == '\0') |
| { |
| /* Skip names that don't exist (shouldn't happen), or names |
| that are null strings (may happen). */ |
| continue; |
| } |
| |
| offset = ANOFFSET (objfile->section_offsets, sym->section->index); |
| if (dynamic |
| && sym->section == &bfd_und_section |
| && (sym->flags & BSF_FUNCTION)) |
| { |
| struct minimal_symbol *msym; |
| |
| /* Symbol is a reference to a function defined in |
| a shared library. |
| If its value is non zero then it is usually the address |
| of the corresponding entry in the procedure linkage table, |
| plus the desired section offset. |
| If its value is zero then the dynamic linker has to resolve |
| the symbol. We are unable to find any meaningful address |
| for this symbol in the executable file, so we skip it. */ |
| symaddr = sym->value; |
| if (symaddr == 0) |
| continue; |
| symaddr += offset; |
| msym = record_minimal_symbol_and_info |
| ((char *) sym->name, symaddr, |
| mst_solib_trampoline, NULL, sym->section, objfile); |
| #ifdef SOFUN_ADDRESS_MAYBE_MISSING |
| if (msym != NULL) |
| msym->filename = filesymname; |
| #endif |
| continue; |
| } |
| |
| /* If it is a nonstripped executable, do not enter dynamic |
| symbols, as the dynamic symbol table is usually a subset |
| of the main symbol table. */ |
| if (dynamic && !stripped) |
| continue; |
| if (sym->flags & BSF_FILE) |
| { |
| /* STT_FILE debugging symbol that helps stabs-in-elf debugging. |
| Chain any old one onto the objfile; remember new sym. */ |
| if (sectinfo != NULL) |
| { |
| sectinfo->next = dbx->stab_section_info; |
| dbx->stab_section_info = sectinfo; |
| sectinfo = NULL; |
| } |
| filesym = sym; |
| #ifdef SOFUN_ADDRESS_MAYBE_MISSING |
| filesymname = |
| obsavestring ((char *) filesym->name, strlen (filesym->name), |
| &objfile->symbol_obstack); |
| #endif |
| } |
| else if (sym->flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK)) |
| { |
| struct minimal_symbol *msym; |
| |
| /* Select global/local/weak symbols. Note that bfd puts abs |
| symbols in their own section, so all symbols we are |
| interested in will have a section. */ |
| /* Bfd symbols are section relative. */ |
| symaddr = sym->value + sym->section->vma; |
| /* Relocate all non-absolute symbols by the section offset. */ |
| if (sym->section != &bfd_abs_section) |
| { |
| symaddr += offset; |
| } |
| /* For non-absolute symbols, use the type of the section |
| they are relative to, to intuit text/data. Bfd provides |
| no way of figuring this out for absolute symbols. */ |
| if (sym->section == &bfd_abs_section) |
| { |
| /* This is a hack to get the minimal symbol type |
| right for Irix 5, which has absolute addresses |
| with special section indices for dynamic symbols. */ |
| unsigned short shndx = |
| ((elf_symbol_type *) sym)->internal_elf_sym.st_shndx; |
| |
| switch (shndx) |
| { |
| case SHN_MIPS_TEXT: |
| ms_type = mst_text; |
| break; |
| case SHN_MIPS_DATA: |
| ms_type = mst_data; |
| break; |
| case SHN_MIPS_ACOMMON: |
| ms_type = mst_bss; |
| break; |
| default: |
| ms_type = mst_abs; |
| } |
| |
| /* If it is an Irix dynamic symbol, skip section name |
| symbols, relocate all others by section offset. */ |
| if (ms_type != mst_abs) |
| { |
| if (sym->name[0] == '.') |
| continue; |
| symaddr += offset; |
| } |
| } |
| else if (sym->section->flags & SEC_CODE) |
| { |
| if (sym->flags & BSF_GLOBAL) |
| { |
| ms_type = mst_text; |
| } |
| else if ((sym->name[0] == '.' && sym->name[1] == 'L') |
| || ((sym->flags & BSF_LOCAL) |
| && sym->name[0] == '$' |
| && sym->name[1] == 'L')) |
| /* Looks like a compiler-generated label. Skip it. |
| The assembler should be skipping these (to keep |
| executables small), but apparently with gcc on the |
| delta m88k SVR4, it loses. So to have us check too |
| should be harmless (but I encourage people to fix this |
| in the assembler instead of adding checks here). */ |
| continue; |
| #ifdef HARRIS_TARGET |
| else if (sym->name[0] == '.' && sym->name[1] == '.') |
| { |
| /* Looks like a Harris compiler generated label for the |
| purpose of marking instructions that are relevant to |
| DWARF dies. The assembler can't get rid of these |
| because they are relocatable addresses that the |
| linker needs to resolve. */ |
| continue; |
| } |
| #endif |
| else |
| { |
| ms_type = mst_file_text; |
| } |
| } |
| else if (sym->section->flags & SEC_ALLOC) |
| { |
| if (sym->flags & (BSF_GLOBAL | BSF_WEAK)) |
| { |
| if (sym->section->flags & SEC_LOAD) |
| { |
| ms_type = mst_data; |
| } |
| else |
| { |
| ms_type = mst_bss; |
| } |
| } |
| else if (sym->flags & BSF_LOCAL) |
| { |
| /* Named Local variable in a Data section. Check its |
| name for stabs-in-elf. The STREQ macro checks the |
| first character inline, so we only actually do a |
| strcmp function call on names that start with 'B' |
| or 'D' */ |
| index = SECT_OFF_MAX; |
| if (STREQ ("Bbss.bss", sym->name)) |
| { |
| index = SECT_OFF_BSS (objfile); |
| } |
| else if (STREQ ("Ddata.data", sym->name)) |
| { |
| index = SECT_OFF_DATA (objfile); |
| } |
| else if (STREQ ("Drodata.rodata", sym->name)) |
| { |
| index = SECT_OFF_RODATA (objfile); |
| } |
| if (index != SECT_OFF_MAX) |
| { |
| /* Found a special local symbol. Allocate a |
| sectinfo, if needed, and fill it in. */ |
| if (sectinfo == NULL) |
| { |
| sectinfo = (struct stab_section_info *) |
| xmmalloc (objfile->md, sizeof (*sectinfo)); |
| memset (sectinfo, 0, |
| sizeof (*sectinfo)); |
| if (filesym == NULL) |
| { |
| complain (§ion_info_complaint, |
| sym->name); |
| } |
| else |
| { |
| sectinfo->filename = |
| (char *) filesym->name; |
| } |
| } |
| if (index != -1) |
| { |
| if (sectinfo->sections[index] != 0) |
| { |
| complain (§ion_info_dup_complaint, |
| sectinfo->filename); |
| } |
| } |
| else |
| internal_error (__FILE__, __LINE__, |
| "Section index uninitialized."); |
| /* Bfd symbols are section relative. */ |
| symaddr = sym->value + sym->section->vma; |
| /* Relocate non-absolute symbols by the section offset. */ |
| if (sym->section != &bfd_abs_section) |
| { |
| symaddr += offset; |
| } |
| if (index != -1) |
| sectinfo->sections[index] = symaddr; |
| else |
| internal_error (__FILE__, __LINE__, |
| "Section index uninitialized."); |
| /* The special local symbols don't go in the |
| minimal symbol table, so ignore this one. */ |
| continue; |
| } |
| /* Not a special stabs-in-elf symbol, do regular |
| symbol processing. */ |
| if (sym->section->flags & SEC_LOAD) |
| { |
| ms_type = mst_file_data; |
| } |
| else |
| { |
| ms_type = mst_file_bss; |
| } |
| } |
| else |
| { |
| ms_type = mst_unknown; |
| } |
| } |
| else |
| { |
| /* FIXME: Solaris2 shared libraries include lots of |
| odd "absolute" and "undefined" symbols, that play |
| hob with actions like finding what function the PC |
| is in. Ignore them if they aren't text, data, or bss. */ |
| /* ms_type = mst_unknown; */ |
| continue; /* Skip this symbol. */ |
| } |
| /* Pass symbol size field in via BFD. FIXME!!! */ |
| size = ((elf_symbol_type *) sym)->internal_elf_sym.st_size; |
| msym = record_minimal_symbol_and_info |
| ((char *) sym->name, symaddr, |
| ms_type, (void *) size, sym->section, objfile); |
| #ifdef SOFUN_ADDRESS_MAYBE_MISSING |
| if (msym != NULL) |
| msym->filename = filesymname; |
| #endif |
| ELF_MAKE_MSYMBOL_SPECIAL (sym, msym); |
| } |
| } |
| do_cleanups (back_to); |
| } |
| } |
| |
| /* Scan and build partial symbols for a symbol file. |
| We have been initialized by a call to elf_symfile_init, which |
| currently does nothing. |
| |
| SECTION_OFFSETS is a set of offsets to apply to relocate the symbols |
| in each section. We simplify it down to a single offset for all |
| symbols. FIXME. |
| |
| MAINLINE is true if we are reading the main symbol |
| table (as opposed to a shared lib or dynamically loaded file). |
| |
| This function only does the minimum work necessary for letting the |
| user "name" things symbolically; it does not read the entire symtab. |
| Instead, it reads the external and static symbols and puts them in partial |
| symbol tables. When more extensive information is requested of a |
| file, the corresponding partial symbol table is mutated into a full |
| fledged symbol table by going back and reading the symbols |
| for real. |
| |
| We look for sections with specific names, to tell us what debug |
| format to look for: FIXME!!! |
| |
| dwarf_build_psymtabs() builds psymtabs for DWARF symbols; |
| elfstab_build_psymtabs() handles STABS symbols; |
| mdebug_build_psymtabs() handles ECOFF debugging information. |
| |
| Note that ELF files have a "minimal" symbol table, which looks a lot |
| like a COFF symbol table, but has only the minimal information necessary |
| for linking. We process this also, and use the information to |
| build gdb's minimal symbol table. This gives us some minimal debugging |
| capability even for files compiled without -g. */ |
| |
| static void |
| elf_symfile_read (struct objfile *objfile, int mainline) |
| { |
| bfd *abfd = objfile->obfd; |
| struct elfinfo ei; |
| struct cleanup *back_to; |
| CORE_ADDR offset; |
| |
| init_minimal_symbol_collection (); |
| back_to = make_cleanup_discard_minimal_symbols (); |
| |
| memset ((char *) &ei, 0, sizeof (ei)); |
| |
| /* Allocate struct to keep track of the symfile */ |
| objfile->sym_stab_info = (struct dbx_symfile_info *) |
| xmmalloc (objfile->md, sizeof (struct dbx_symfile_info)); |
| memset ((char *) objfile->sym_stab_info, 0, sizeof (struct dbx_symfile_info)); |
| make_cleanup (free_elfinfo, (void *) objfile); |
| |
| /* Process the normal ELF symbol table first. This may write some |
| chain of info into the dbx_symfile_info in objfile->sym_stab_info, |
| which can later be used by elfstab_offset_sections. */ |
| |
| elf_symtab_read (objfile, 0); |
| |
| /* Add the dynamic symbols. */ |
| |
| elf_symtab_read (objfile, 1); |
| |
| /* Now process debugging information, which is contained in |
| special ELF sections. */ |
| |
| /* If we are reinitializing, or if we have never loaded syms yet, |
| set table to empty. MAINLINE is cleared so that *_read_psymtab |
| functions do not all also re-initialize the psymbol table. */ |
| if (mainline) |
| { |
| init_psymbol_list (objfile, 0); |
| mainline = 0; |
| } |
| |
| /* We first have to find them... */ |
| bfd_map_over_sections (abfd, elf_locate_sections, (void *) & ei); |
| |
| /* ELF debugging information is inserted into the psymtab in the |
| order of least informative first - most informative last. Since |
| the psymtab table is searched `most recent insertion first' this |
| increases the probability that more detailed debug information |
| for a section is found. |
| |
| For instance, an object file might contain both .mdebug (XCOFF) |
| and .debug_info (DWARF2) sections then .mdebug is inserted first |
| (searched last) and DWARF2 is inserted last (searched first). If |
| we don't do this then the XCOFF info is found first - for code in |
| an included file XCOFF info is useless. */ |
| |
| if (ei.mdebugsect) |
| { |
| const struct ecoff_debug_swap *swap; |
| |
| /* .mdebug section, presumably holding ECOFF debugging |
| information. */ |
| swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap; |
| if (swap) |
| elfmdebug_build_psymtabs (objfile, swap, ei.mdebugsect); |
| } |
| if (ei.stabsect) |
| { |
| asection *str_sect; |
| |
| /* Stab sections have an associated string table that looks like |
| a separate section. */ |
| str_sect = bfd_get_section_by_name (abfd, ".stabstr"); |
| |
| /* FIXME should probably warn about a stab section without a stabstr. */ |
| if (str_sect) |
| elfstab_build_psymtabs (objfile, |
| mainline, |
| ei.stabsect->filepos, |
| bfd_section_size (abfd, ei.stabsect), |
| str_sect->filepos, |
| bfd_section_size (abfd, str_sect)); |
| } |
| if (dwarf2_has_info (abfd)) |
| { |
| /* DWARF 2 sections */ |
| dwarf2_build_psymtabs (objfile, mainline); |
| } |
| else if (ei.dboffset && ei.lnoffset) |
| { |
| /* DWARF sections */ |
| dwarf_build_psymtabs (objfile, |
| mainline, |
| ei.dboffset, ei.dbsize, |
| ei.lnoffset, ei.lnsize); |
| } |
| |
| if (DWARF2_BUILD_FRAME_INFO_P ()) |
| DWARF2_BUILD_FRAME_INFO(objfile); |
| |
| /* Install any minimal symbols that have been collected as the current |
| minimal symbols for this objfile. */ |
| |
| install_minimal_symbols (objfile); |
| |
| do_cleanups (back_to); |
| } |
| |
| /* This cleans up the objfile's sym_stab_info pointer, and the chain of |
| stab_section_info's, that might be dangling from it. */ |
| |
| static void |
| free_elfinfo (void *objp) |
| { |
| struct objfile *objfile = (struct objfile *) objp; |
| struct dbx_symfile_info *dbxinfo = objfile->sym_stab_info; |
| struct stab_section_info *ssi, *nssi; |
| |
| ssi = dbxinfo->stab_section_info; |
| while (ssi) |
| { |
| nssi = ssi->next; |
| xmfree (objfile->md, ssi); |
| ssi = nssi; |
| } |
| |
| dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */ |
| } |
| |
| |
| /* Initialize anything that needs initializing when a completely new symbol |
| file is specified (not just adding some symbols from another file, e.g. a |
| shared library). |
| |
| We reinitialize buildsym, since we may be reading stabs from an ELF file. */ |
| |
| static void |
| elf_new_init (struct objfile *ignore) |
| { |
| stabsread_new_init (); |
| buildsym_new_init (); |
| } |
| |
| /* Perform any local cleanups required when we are done with a particular |
| objfile. I.E, we are in the process of discarding all symbol information |
| for an objfile, freeing up all memory held for it, and unlinking the |
| objfile struct from the global list of known objfiles. */ |
| |
| static void |
| elf_symfile_finish (struct objfile *objfile) |
| { |
| if (objfile->sym_stab_info != NULL) |
| { |
| xmfree (objfile->md, objfile->sym_stab_info); |
| } |
| } |
| |
| /* ELF specific initialization routine for reading symbols. |
| |
| It is passed a pointer to a struct sym_fns which contains, among other |
| things, the BFD for the file whose symbols are being read, and a slot for |
| a pointer to "private data" which we can fill with goodies. |
| |
| For now at least, we have nothing in particular to do, so this function is |
| just a stub. */ |
| |
| static void |
| elf_symfile_init (struct objfile *objfile) |
| { |
| /* ELF objects may be reordered, so set OBJF_REORDERED. If we |
| find this causes a significant slowdown in gdb then we could |
| set it in the debug symbol readers only when necessary. */ |
| objfile->flags |= OBJF_REORDERED; |
| } |
| |
| /* When handling an ELF file that contains Sun STABS debug info, |
| some of the debug info is relative to the particular chunk of the |
| section that was generated in its individual .o file. E.g. |
| offsets to static variables are relative to the start of the data |
| segment *for that module before linking*. This information is |
| painfully squirreled away in the ELF symbol table as local symbols |
| with wierd names. Go get 'em when needed. */ |
| |
| void |
| elfstab_offset_sections (struct objfile *objfile, struct partial_symtab *pst) |
| { |
| char *filename = pst->filename; |
| struct dbx_symfile_info *dbx = objfile->sym_stab_info; |
| struct stab_section_info *maybe = dbx->stab_section_info; |
| struct stab_section_info *questionable = 0; |
| int i; |
| char *p; |
| |
| /* The ELF symbol info doesn't include path names, so strip the path |
| (if any) from the psymtab filename. */ |
| while (0 != (p = strchr (filename, '/'))) |
| filename = p + 1; |
| |
| /* FIXME: This linear search could speed up significantly |
| if it was chained in the right order to match how we search it, |
| and if we unchained when we found a match. */ |
| for (; maybe; maybe = maybe->next) |
| { |
| if (filename[0] == maybe->filename[0] |
| && STREQ (filename, maybe->filename)) |
| { |
| /* We found a match. But there might be several source files |
| (from different directories) with the same name. */ |
| if (0 == maybe->found) |
| break; |
| questionable = maybe; /* Might use it later. */ |
| } |
| } |
| |
| if (maybe == 0 && questionable != 0) |
| { |
| complain (&stab_info_questionable_complaint, filename); |
| maybe = questionable; |
| } |
| |
| if (maybe) |
| { |
| /* Found it! Allocate a new psymtab struct, and fill it in. */ |
| maybe->found++; |
| pst->section_offsets = (struct section_offsets *) |
| obstack_alloc (&objfile->psymbol_obstack, SIZEOF_SECTION_OFFSETS); |
| for (i = 0; i < SECT_OFF_MAX; i++) |
| (pst->section_offsets)->offsets[i] = maybe->sections[i]; |
| return; |
| } |
| |
| /* We were unable to find any offsets for this file. Complain. */ |
| if (dbx->stab_section_info) /* If there *is* any info, */ |
| complain (&stab_info_mismatch_complaint, filename); |
| } |
| |
| /* Register that we are able to handle ELF object file formats. */ |
| |
| static struct sym_fns elf_sym_fns = |
| { |
| bfd_target_elf_flavour, |
| elf_new_init, /* sym_new_init: init anything gbl to entire symtab */ |
| elf_symfile_init, /* sym_init: read initial info, setup for sym_read() */ |
| elf_symfile_read, /* sym_read: read a symbol file into symtab */ |
| elf_symfile_finish, /* sym_finish: finished with file, cleanup */ |
| default_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */ |
| NULL /* next: pointer to next struct sym_fns */ |
| }; |
| |
| void |
| _initialize_elfread (void) |
| { |
| add_symtab_fns (&elf_sym_fns); |
| } |