/* Read ELF (Executable and Linking Format) object files for GDB.
- Copyright (C) 1991 Free Software Foundation, Inc.
+ Copyright 1991, 92, 93, 94, 95, 96, 1998 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
-/************************************************************************
- * *
- * NOTICE *
- * *
- * This file is still under construction. When it is complete, this *
- * notice will be removed. Until then, direct any questions or changes *
- * to Fred Fish at Cygnus Support (fnf@cygint) *
- * *
- * FIXME Still needs support for shared libraries. *
- * FIXME Still needs support for core files. *
- * FIXME The ".debug" and ".line" section names are hardwired. *
- * FIXME Still needs support ELF symbol tables (as distinct *
- * from DWARF support). Can use them to build the misc *
- * function vector at least. This is fairly trivial once *
- * bfd is extended to handle ELF symbol tables. *
- * *
- ************************************************************************/
-
-#include <stdio.h>
+ 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 "elf/common.h"
-#include "elf/external.h"
-#include "elf/internal.h"
#include "bfd.h"
-#include "symfile.h"
+#include "gdb_string.h"
+#include "elf-bfd.h"
+#include "elf/mips.h"
#include "symtab.h"
-#include "ansidecl.h"
+#include "symfile.h"
+#include "objfiles.h"
+#include "buildsym.h"
+#include "stabsread.h"
+#include "gdb-stabs.h"
+#include "complaints.h"
+#include "demangle.h"
-extern int EXFUN (strcmp, (CONST char *a, CONST char *b));
-extern int EXFUN (dwarf_build_psymtabs,
- (int desc, char *filename, CORE_ADDR addr, int mainline,
- unsigned int dbfoff, unsigned int dbsize, unsigned int lnoffset,
- unsigned int lnsize, struct objfile *objfile));
+extern void _initialize_elfread PARAMS ((void));
-#define STREQ(a,b) (strcmp((a),(b))==0)
+/* 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 {
- unsigned int dboffset; /* Offset to dwarf debug section */
- unsigned int dbsize; /* Size of dwarf debug section */
- unsigned int lnoffset; /* Offset to dwarf line number section */
- unsigned int lnsize; /* Size of dwarf line number section */
-};
+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
+elf_symfile_init PARAMS ((struct objfile *));
+
+static void
+elf_new_init PARAMS ((struct objfile *));
+
+static void
+elf_symfile_read PARAMS ((struct objfile *, int));
+
+static void
+elf_symfile_finish PARAMS ((struct objfile *));
+
+static void
+elf_symtab_read PARAMS ((struct objfile *, int));
+
+static void
+free_elfinfo PARAMS ((void *));
+
+static struct minimal_symbol *
+ record_minimal_symbol_and_info PARAMS ((char *, CORE_ADDR,
+ enum minimal_symbol_type, char *,
+ asection * bfd_section,
+ struct objfile *));
+
+static void
+elf_locate_sections PARAMS ((bfd *, asection *, void *));
/* We are called once per section from elf_symfile_read. We
need to examine each section we are passed, check to see
knowledge of DWARF (by design, so any debugging format can be
used).
- FIXME: The section names should not be hardwired strings. */
+ 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
-DEFUN(elf_locate_sections, (abfd, sectp, ei),
- bfd *abfd AND
- asection *sectp AND
- struct elfinfo *ei)
+elf_locate_sections (ignore_abfd, sectp, eip)
+ bfd *ignore_abfd;
+ asection *sectp;
+ PTR eip;
{
- if (STREQ (sectp -> name, ".debug"))
+ 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 -> dboffset = sectp -> filepos;
- ei -> dbsize = bfd_get_section_size_before_reloc (sectp);
+ ei->stabsect = sectp;
}
- else if (STREQ (sectp -> name, ".line"))
+ else if (STREQ (sectp->name, ".stab.index"))
{
- ei -> lnoffset = sectp -> filepos;
- ei -> lnsize = bfd_get_section_size_before_reloc (sectp);
+ ei->stabindexsect = sectp;
+ }
+ else if (STREQ (sectp->name, ".mdebug"))
+ {
+ ei->mdebugsect = sectp;
}
}
+#if 0 /* Currently unused */
+
char *
-DEFUN(elf_interpreter, (abfd),
- bfd *abfd)
+elf_interpreter (abfd)
+ bfd *abfd;
{
sec_ptr interp_sec;
unsigned size;
{
size = bfd_section_size (abfd, interp_sec);
interp = alloca (size);
- if (bfd_get_section_contents (abfd, interp_sec, interp, (file_ptr)0,
+ if (bfd_get_section_contents (abfd, interp_sec, interp, (file_ptr) 0,
size))
{
interp = savestring (interp, size - 1);
return (interp);
}
-/*
-
-LOCAL FUNCTION
-
- record_misc_function -- add entry to miscellaneous function vector
-
-SYNOPSIS
-
- static void record_misc_function (char *name, CORE_ADDR address)
-
-DESCRIPTION
-
- Given a pointer to the name of a symbol that should be added to the
- miscellaneous function vector, and the address associated with that
- symbol, records this information for later use in building the
- miscellaneous function vector.
-
-NOTES
+#endif
+
+static struct minimal_symbol *
+record_minimal_symbol_and_info (name, address, ms_type, info, bfd_section,
+ objfile)
+ char *name;
+ CORE_ADDR address;
+ enum minimal_symbol_type ms_type;
+ char *info; /* FIXME, is this really char *? */
+ asection *bfd_section;
+ struct objfile *objfile;
+{
+ int section;
- FIXME: For now we just use mf_unknown as the type. This should be
- fixed.
- */
+ /* Guess the section from the type. This is likely to be wrong in
+ some cases. */
+ switch (ms_type)
+ {
+ case mst_text:
+ case mst_file_text:
+ section = SECT_OFF_TEXT;
+#ifdef SMASH_TEXT_ADDRESS
+ SMASH_TEXT_ADDRESS (address);
+#endif
+ break;
+ case mst_data:
+ case mst_file_data:
+ section = SECT_OFF_DATA;
+ break;
+ case mst_bss:
+ case mst_file_bss:
+ section = SECT_OFF_BSS;
+ break;
+ default:
+ section = -1;
+ break;
+ }
-static void
-DEFUN(record_misc_function, (name, address, mf_type),
- char *name AND CORE_ADDR address AND enum misc_function_type mf_type)
-{
- prim_record_misc_function (obsavestring (name, strlen (name)), address,
- mf_type);
+ return prim_record_minimal_symbol_and_info
+ (name, address, ms_type, info, section, bfd_section, objfile);
}
/*
-LOCAL FUNCTION
+ LOCAL FUNCTION
+
+ elf_symtab_read -- read the symbol table of an ELF file
- elf_symtab_read -- read the symbol table of an ELF file
+ SYNOPSIS
-SYNOPSIS
+ void elf_symtab_read (struct objfile *objfile, int dynamic)
- void elf_symtab_read (bfd *abfd, CORE_ADDR addr, int mainline)
+ DESCRIPTION
-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.
- Given an open bfd, a base address to relocate symbols to, and a
- flag that specifies whether or not this bfd is for an executable
- or not (may be shared library for example), add all the global
- function and data symbols to the miscellaneous function vector.
+ 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
-DEFUN (elf_symtab_read, (abfd, addr, mainline),
- bfd *abfd AND
- CORE_ADDR addr AND
- int mainline)
+elf_symtab_read (objfile, dynamic)
+ struct objfile *objfile;
+ int dynamic;
{
- unsigned int storage_needed;
+ long storage_needed;
asymbol *sym;
asymbol **symbol_table;
- unsigned int number_of_symbols;
- unsigned int i;
+ long number_of_symbols;
+ long i;
+ int index;
struct cleanup *back_to;
CORE_ADDR symaddr;
- enum misc_function_type mf_type;
-
- storage_needed = get_symtab_upper_bound (abfd);
+ 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 **) bfd_xmalloc (storage_needed);
+ symbol_table = (asymbol **) xmalloc (storage_needed);
back_to = make_cleanup (free, symbol_table);
- number_of_symbols = bfd_canonicalize_symtab (abfd, 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 ()));
+ offset = ANOFFSET (objfile->section_offsets, sym->section->index);
for (i = 0; i < number_of_symbols; i++)
{
- sym = *symbol_table++;
- /* Select global/weak symbols that are defined in a specific section.
- Note that bfd now puts abs symbols in their own section, so
- all symbols we are interested in will have a section. */
- if ((sym -> flags & (BSF_GLOBAL | BSF_WEAK))
- && (sym -> section != NULL))
+ sym = symbol_table[i];
+ if (sym->name == NULL || *sym->name == '\0')
{
- symaddr = sym -> value;
- /* Relocate all non-absolute symbols by base address.
- FIXME: Can we eliminate the check for mainline now,
- since shouldn't addr be 0 in this case? */
- if (!mainline && (sym -> section != &bfd_abs_section))
+ /* Skip names that don't exist (shouldn't happen), or names
+ that are null strings (may happen). */
+ continue;
+ }
+
+ 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)
{
- symaddr += addr;
+ 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 -> flags & SEC_CODE)
+ 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)
{
- mf_type = mf_text;
+ 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_DATA)
+ else if (sym->section->flags & SEC_ALLOC)
{
- mf_type = mf_data;
+ if (sym->flags & BSF_GLOBAL)
+ {
+ 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;
+ }
+ else if (STREQ ("Ddata.data", sym->name))
+ {
+ index = SECT_OFF_DATA;
+ }
+ else if (STREQ ("Drodata.rodata", sym->name))
+ {
+ index = SECT_OFF_RODATA;
+ }
+ 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 ((PTR) sectinfo, 0, sizeof (*sectinfo));
+ if (filesym == NULL)
+ {
+ complain (§ion_info_complaint,
+ sym->name);
+ }
+ else
+ {
+ sectinfo->filename =
+ (char *) filesym->name;
+ }
+ }
+ if (sectinfo->sections[index] != 0)
+ {
+ complain (§ion_info_dup_complaint,
+ sectinfo->filename);
+ }
+ /* 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;
+ }
+ sectinfo->sections[index] = symaddr;
+ /* 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
{
- mf_type = mf_unknown;
+ /* 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. */
}
- record_misc_function ((char *) sym -> name, symaddr, mf_type);
+ /* 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, (PTR) size, sym->section, objfile);
+#ifdef SOFUN_ADDRESS_MAYBE_MISSING
+ if (msym != NULL)
+ msym->filename = filesymname;
+#endif
+#ifdef ELF_MAKE_MSYMBOL_SPECIAL
+ ELF_MAKE_MSYMBOL_SPECIAL (sym, msym);
+#endif
}
}
do_cleanups (back_to);
We have been initialized by a call to elf_symfile_init, which
currently does nothing.
- ADDR is the address relative to which the symbols in it are (e.g.
- the base address of the text segment).
+ 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).
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. The function dwarf_psymtab_to_symtab() is the function that
- does this for DWARF 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 just use the information to
- add to the misc function vector. This gives us some minimal debugging
- capability even for files compiled without -g.
- */
+ 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
-DEFUN(elf_symfile_read, (sf, addr, mainline),
- struct sym_fns *sf AND
- CORE_ADDR addr AND
- int mainline)
+elf_symfile_read (objfile, mainline)
+ struct objfile *objfile;
+ int mainline;
{
- bfd *abfd = sf->objfile->obfd;
+ bfd *abfd = objfile->obfd;
struct elfinfo ei;
struct cleanup *back_to;
+ CORE_ADDR offset;
- init_misc_bunches ();
- back_to = make_cleanup (discard_misc_bunches, 0);
+ init_minimal_symbol_collection ();
+ back_to = make_cleanup ((make_cleanup_func) discard_minimal_symbols, 0);
- /* Process the normal ELF symbol table first. */
+ memset ((char *) &ei, 0, sizeof (ei));
- elf_symtab_read (abfd, addr, mainline);
+ /* 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, (PTR) objfile);
- /* Now process the DWARF debugging information, which is contained in
- special ELF sections. We first have to find them... */
+ /* 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. */
- (void) memset ((char *) &ei, 0, sizeof (ei));
- bfd_map_over_sections (abfd, elf_locate_sections, &ei);
- if (ei.dboffset && ei.lnoffset)
+ 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)
{
- dwarf_build_psymtabs (fileno ((FILE *)(abfd -> iostream)),
- bfd_get_filename (abfd),
- addr, mainline,
- ei.dboffset, ei.dbsize,
- ei.lnoffset, ei.lnsize, sf->objfile);
+ init_psymbol_list (objfile, 0);
+ mainline = 0;
}
- if (!partial_symtab_list)
+ /* We first have to find them... */
+ bfd_map_over_sections (abfd, elf_locate_sections, (PTR) & 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)
{
- wrap_here ("");
- printf_filtered ("(no debugging symbols found)...");
- wrap_here ("");
+ 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);
}
- /* Go over the miscellaneous functions and install them in the
- miscellaneous function vector. */
-
- condense_misc_bunches (!mainline);
+ /* 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 (objp)
+ PTR 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;
+ mfree (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).
- For now at least, we have nothing in particular to do, so this function is
- just a stub. */
+ We reinitialize buildsym, since we may be reading stabs from an ELF file. */
+
+static void
+elf_new_init (ignore)
+ 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
-DEFUN_VOID (elf_new_init)
+elf_symfile_finish (objfile)
+ struct objfile *objfile;
{
+ if (objfile->sym_stab_info != NULL)
+ {
+ mfree (objfile->md, objfile->sym_stab_info);
+ }
}
/* ELF specific initialization routine for reading symbols.
just a stub. */
static void
-DEFUN(elf_symfile_init, (sf),
- struct sym_fns *sf)
+elf_symfile_init (objfile)
+ 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 (objfile, pst)
+ 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++)
+ ANOFFSET (pst->section_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);
+}
\f
-/* Register that we are able to handle ELF object file formats and DWARF
- debugging formats.
-
- Unlike other object file formats, where the debugging information format
- is implied by the object file format, the ELF object file format and the
- DWARF debugging information format are two distinct, and potentially
- separate entities. I.E. it is perfectly possible to have ELF objects
- with debugging formats other than DWARF. And it is conceivable that the
- DWARF debugging format might be used with another object file format,
- like COFF, by simply using COFF's custom section feature.
-
- GDB, and to a lesser extent BFD, should support the notion of separate
- object file formats and debugging information formats. For now, we just
- use "elf" in the same sense as "a.out" or "coff", to imply both the ELF
- object file format and the DWARF debugging format. */
-
-static struct sym_fns elf_sym_fns = {
- "elf", /* sym_name: name or name prefix of BFD target type */
- 3, /* sym_namelen: number of significant sym_name chars */
- 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 */
- NULL, /* sym_bfd: accessor for symbol file being read */
- NULL, /* sym_private: sym_init & sym_read shared info */
- NULL /* next: pointer to next struct sym_fns */
+/* 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
-DEFUN_VOID (_initialize_elfread)
+_initialize_elfread ()
{
add_symtab_fns (&elf_sym_fns);
}
projects / binutils.git / blobdiff