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8bdc1fd08a
construction.
649 lines
20 KiB
C
649 lines
20 KiB
C
/* Read ELF (Executable and Linking Format) object files for GDB.
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Copyright 1991, 1992 Free Software Foundation, Inc.
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Written by Fred Fish at Cygnus Support.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "defs.h"
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#include "bfd.h"
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#include "libbfd.h" /* For bfd_elf_find_section */
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#include "libelf.h"
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#include "symtab.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "buildsym.h"
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#include "gdb-stabs.h"
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#include "complaints.h"
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#include <string.h>
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#include "demangle.h"
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/* The struct elfinfo is available only during ELF symbol table and
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psymtab reading. It is destroyed at the complation of psymtab-reading.
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It's local to elf_symfile_read. */
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struct elfinfo {
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file_ptr dboffset; /* Offset to dwarf debug section */
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unsigned int dbsize; /* Size of dwarf debug section */
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file_ptr lnoffset; /* Offset to dwarf line number section */
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unsigned int lnsize; /* Size of dwarf line number section */
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asection *stabsect; /* Section pointer for .stab section */
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asection *stabindexsect; /* Section pointer for .stab.index section */
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};
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/* Various things we might complain about... */
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struct complaint section_info_complaint =
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{"elf/stab section information %s without a preceding file symbol", 0, 0};
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struct complaint section_info_dup_complaint =
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{"duplicated elf/stab section information for %s", 0, 0};
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struct complaint stab_info_mismatch_complaint =
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{"elf/stab section information missing for %s", 0, 0};
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struct complaint stab_info_questionable_complaint =
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{"elf/stab section information questionable for %s", 0, 0};
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static void
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elf_symfile_init PARAMS ((struct objfile *));
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static void
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elf_new_init PARAMS ((struct objfile *));
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static void
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elf_symfile_read PARAMS ((struct objfile *, struct section_offsets *, int));
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static void
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elf_symfile_finish PARAMS ((struct objfile *));
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static void
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elf_symtab_read PARAMS ((bfd *, CORE_ADDR, struct objfile *));
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static void
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free_elfinfo PARAMS ((PTR));
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static struct section_offsets *
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elf_symfile_offsets PARAMS ((struct objfile *, CORE_ADDR));
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static void
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record_minimal_symbol_and_info PARAMS ((char *, CORE_ADDR,
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enum minimal_symbol_type, char *,
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struct objfile *));
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static void
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elf_locate_sections PARAMS ((bfd *, asection *, PTR));
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/* We are called once per section from elf_symfile_read. We
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need to examine each section we are passed, check to see
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if it is something we are interested in processing, and
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if so, stash away some access information for the section.
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For now we recognize the dwarf debug information sections and
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line number sections from matching their section names. The
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ELF definition is no real help here since it has no direct
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knowledge of DWARF (by design, so any debugging format can be
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used).
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We also recognize the ".stab" sections used by the Sun compilers
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released with Solaris 2.
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FIXME: The section names should not be hardwired strings. */
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static void
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elf_locate_sections (ignore_abfd, sectp, eip)
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bfd *ignore_abfd;
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asection *sectp;
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PTR eip;
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{
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register struct elfinfo *ei;
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ei = (struct elfinfo *) eip;
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if (STREQ (sectp -> name, ".debug"))
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{
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ei -> dboffset = sectp -> filepos;
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ei -> dbsize = bfd_get_section_size_before_reloc (sectp);
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}
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else if (STREQ (sectp -> name, ".line"))
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{
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ei -> lnoffset = sectp -> filepos;
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ei -> lnsize = bfd_get_section_size_before_reloc (sectp);
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}
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else if (STREQ (sectp -> name, ".stab"))
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{
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ei -> stabsect = sectp;
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}
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else if (STREQ (sectp -> name, ".stab.index"))
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{
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ei -> stabindexsect = sectp;
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}
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}
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#if 0 /* Currently unused */
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char *
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elf_interpreter (abfd)
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bfd *abfd;
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{
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sec_ptr interp_sec;
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unsigned size;
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char *interp = NULL;
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interp_sec = bfd_get_section_by_name (abfd, ".interp");
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if (interp_sec)
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{
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size = bfd_section_size (abfd, interp_sec);
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interp = alloca (size);
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if (bfd_get_section_contents (abfd, interp_sec, interp, (file_ptr)0,
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size))
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{
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interp = savestring (interp, size - 1);
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}
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else
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{
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interp = NULL;
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}
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}
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return (interp);
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}
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#endif
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static void
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record_minimal_symbol_and_info (name, address, ms_type, info, objfile)
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char *name;
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CORE_ADDR address;
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enum minimal_symbol_type ms_type;
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char *info; /* FIXME, is this really char *? */
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struct objfile *objfile;
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{
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name = obsavestring (name, strlen (name), &objfile -> symbol_obstack);
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prim_record_minimal_symbol_and_info (name, address, ms_type, info, -1);
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}
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/*
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LOCAL FUNCTION
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elf_symtab_read -- read the symbol table of an ELF file
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SYNOPSIS
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void elf_symtab_read (bfd *abfd, CORE_ADDR addr,
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struct objfile *objfile)
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DESCRIPTION
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Given an open bfd, a base address to relocate symbols to, and a
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flag that specifies whether or not this bfd is for an executable
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or not (may be shared library for example), add all the global
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function and data symbols to the minimal symbol table.
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In stabs-in-ELF, as implemented by Sun, there are some local symbols
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defined in the ELF symbol table, which can be used to locate
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the beginnings of sections from each ".o" file that was linked to
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form the executable objfile. We gather any such info and record it
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in data structures hung off the objfile's private data.
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*/
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static void
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elf_symtab_read (abfd, addr, objfile)
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bfd *abfd;
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CORE_ADDR addr;
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struct objfile *objfile;
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{
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unsigned int storage_needed;
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asymbol *sym;
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asymbol **symbol_table;
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unsigned int number_of_symbols;
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unsigned int i;
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int index;
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struct cleanup *back_to;
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CORE_ADDR symaddr;
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enum minimal_symbol_type ms_type;
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/* If sectinfo is nonzero, it contains section info that should end up
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filed in the objfile. */
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struct stab_section_info *sectinfo = 0;
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/* If filesym is nonzero, it points to a file symbol, but we haven't
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seen any section info for it yet. */
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asymbol *filesym = 0;
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struct dbx_symfile_info *dbx = (struct dbx_symfile_info *)
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objfile->sym_private;
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storage_needed = get_symtab_upper_bound (abfd);
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if (storage_needed > 0)
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{
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symbol_table = (asymbol **) xmalloc (storage_needed);
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back_to = make_cleanup (free, symbol_table);
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number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
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for (i = 0; i < number_of_symbols; i++)
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{
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sym = symbol_table[i];
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/* Select global/weak symbols that are defined in a specific section.
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Note that bfd now puts abs symbols in their own section, so
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all symbols we are interested in will have a section. */
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if ((sym -> flags & (BSF_GLOBAL | BSF_WEAK))
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&& (sym -> section != NULL))
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{
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/* Bfd symbols are section relative. */
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symaddr = sym -> value + sym -> section -> vma;
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/* Relocate all non-absolute symbols by base address. */
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if (sym -> section != &bfd_abs_section)
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symaddr += addr;
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/* For non-absolute symbols, use the type of the section
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they are relative to, to intuit text/data. Bfd provides
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no way of figuring this out for absolute symbols. */
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if (sym -> section -> flags & SEC_CODE)
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{
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ms_type = mst_text;
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}
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else if (sym -> section -> flags & SEC_DATA)
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{
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ms_type = mst_data;
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}
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else
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{
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/* FIXME: Solaris2 shared libraries include lots of
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odd "absolute" and "undefined" symbols, that play
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hob with actions like finding what function the PC
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is in. Ignore them if they aren't text or data. */
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/* ms_type = mst_unknown; */
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continue; /* Skip this symbol. */
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}
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/* Pass symbol size field in via BFD. FIXME!!! */
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{
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elf32_symbol_type *esym = (elf32_symbol_type *) sym;
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unsigned long size = esym->internal_elf_sym.st_size;
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record_minimal_symbol_and_info ((char *) sym -> name, symaddr,
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ms_type, (PTR) size, objfile);
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}
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}
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/* See if this is a debugging symbol that helps Solaris
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stabs-in-elf debugging. */
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else if (sym->flags & BSF_FILE)
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{
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/* Chain any old one onto the objfile; remember new sym. */
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if (sectinfo)
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{
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sectinfo->next = dbx->stab_section_info;
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dbx->stab_section_info = sectinfo;
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sectinfo = 0;
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}
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filesym = sym;
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}
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else if ((sym->flags & BSF_LOCAL) &&
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(sym->section) &&
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(sym->section->flags & SEC_DATA) &&
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(sym->name))
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{
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/* Named Local variable in a Data section. Check its name. */
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index = -1;
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switch (sym->name[1])
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{
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case 'b':
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if (STREQ ("Bbss.bss", sym->name))
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index = SECT_OFF_BSS;
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break;
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case 'd':
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if (STREQ ("Ddata.data", sym->name))
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index = SECT_OFF_DATA;
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break;
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case 'r':
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if (STREQ ("Drodata.rodata", sym->name))
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index = SECT_OFF_RODATA;
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break;
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}
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if (index > 0)
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{
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/* We have some new info. Allocate a sectinfo, if
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needed, and fill it in. */
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if (!sectinfo)
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{
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sectinfo = (struct stab_section_info *)
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xmmalloc (objfile -> md,
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sizeof (*sectinfo));
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memset ((PTR) sectinfo, 0, sizeof (*sectinfo));
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if (!filesym)
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complain (§ion_info_complaint, sym->name);
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else
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sectinfo->filename = (char *)filesym->name;
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}
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if (sectinfo->sections[index])
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complain (§ion_info_dup_complaint, sectinfo->filename);
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/* Bfd symbols are section relative. */
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symaddr = sym -> value + sym -> section -> vma;
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/* Relocate all non-absolute symbols by base address. */
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if (sym -> section != &bfd_abs_section)
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symaddr += addr;
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sectinfo->sections[index] = symaddr;
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}
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}
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}
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do_cleanups (back_to);
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}
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}
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/* Scan and build partial symbols for a symbol file.
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We have been initialized by a call to elf_symfile_init, which
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currently does nothing.
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SECTION_OFFSETS is a set of offsets to apply to relocate the symbols
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in each section. We simplify it down to a single offset for all
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symbols. FIXME.
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MAINLINE is true if we are reading the main symbol
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table (as opposed to a shared lib or dynamically loaded file).
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This function only does the minimum work necessary for letting the
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user "name" things symbolically; it does not read the entire symtab.
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Instead, it reads the external and static symbols and puts them in partial
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symbol tables. When more extensive information is requested of a
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file, the corresponding partial symbol table is mutated into a full
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fledged symbol table by going back and reading the symbols
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for real.
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We look for sections with specific names, to tell us what debug
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format to look for: FIXME!!!
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dwarf_build_psymtabs() builds psymtabs for DWARF symbols;
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elfstab_build_psymtabs() handles STABS symbols.
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Note that ELF files have a "minimal" symbol table, which looks a lot
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like a COFF symbol table, but has only the minimal information necessary
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for linking. We process this also, and use the information to
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build gdb's minimal symbol table. This gives us some minimal debugging
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capability even for files compiled without -g. */
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static void
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elf_symfile_read (objfile, section_offsets, mainline)
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struct objfile *objfile;
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struct section_offsets *section_offsets;
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int mainline;
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{
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bfd *abfd = objfile->obfd;
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struct elfinfo ei;
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struct cleanup *back_to;
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CORE_ADDR offset;
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init_minimal_symbol_collection ();
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back_to = make_cleanup (discard_minimal_symbols, 0);
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memset ((char *) &ei, 0, sizeof (ei));
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/* Allocate struct to keep track of the symfile */
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objfile->sym_private = (PTR)
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xmmalloc (objfile -> md, sizeof (struct dbx_symfile_info));
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memset ((char *) objfile->sym_private, 0, sizeof (struct dbx_symfile_info));
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make_cleanup (free_elfinfo, (PTR) objfile);
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/* Process the normal ELF symbol table first. This may write some
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chain of info into the dbx_symfile_info in objfile->sym_private,
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which can later be used by elfstab_offset_sections. */
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/* FIXME, should take a section_offsets param, not just an offset. */
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offset = ANOFFSET (section_offsets, 0);
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elf_symtab_read (abfd, offset, objfile);
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/* Now process debugging information, which is contained in
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special ELF sections. We first have to find them... */
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bfd_map_over_sections (abfd, elf_locate_sections, (PTR) &ei);
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if (ei.dboffset && ei.lnoffset)
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{
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/* DWARF sections */
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dwarf_build_psymtabs (objfile,
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section_offsets, mainline,
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ei.dboffset, ei.dbsize,
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ei.lnoffset, ei.lnsize);
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}
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if (ei.stabsect)
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{
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/* STABS sections */
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/* FIXME: Sun didn't really know how to implement this well.
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They made .stab sections that don't point to the .stabstr
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section with the sh_link field. BFD doesn't make string table
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sections visible to the caller. So we have to search the
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ELF section table, not the BFD section table, for the string
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table. */
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struct elf32_internal_shdr *elf_sect;
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elf_sect = bfd_elf_find_section (abfd, ".stabstr");
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if (elf_sect)
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elfstab_build_psymtabs (objfile,
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section_offsets,
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mainline,
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ei.stabsect->filepos, /* .stab offset */
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bfd_get_section_size_before_reloc (ei.stabsect),/* .stab size */
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(file_ptr) elf_sect->sh_offset, /* .stabstr offset */
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elf_sect->sh_size); /* .stabstr size */
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}
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if (!have_partial_symbols ())
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{
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wrap_here ("");
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printf_filtered ("(no debugging symbols found)...");
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wrap_here ("");
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}
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/* Install any minimal symbols that have been collected as the current
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minimal symbols for this objfile. */
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install_minimal_symbols (objfile);
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do_cleanups (back_to);
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}
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/* This cleans up the objfile's sym_private pointer, and the chain of
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stab_section_info's, that might be dangling from it. */
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static void
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free_elfinfo (objp)
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PTR objp;
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{
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struct objfile *objfile = (struct objfile *)objp;
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struct dbx_symfile_info *dbxinfo = (struct dbx_symfile_info *)
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objfile->sym_private;
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struct stab_section_info *ssi, *nssi;
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ssi = dbxinfo->stab_section_info;
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while (ssi)
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{
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nssi = ssi->next;
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mfree (objfile->md, ssi);
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ssi = nssi;
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}
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dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */
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}
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/* Initialize anything that needs initializing when a completely new symbol
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file is specified (not just adding some symbols from another file, e.g. a
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shared library).
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We reinitialize buildsym, since we may be reading stabs from an ELF file. */
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static void
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elf_new_init (ignore)
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struct objfile *ignore;
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{
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stabsread_new_init ();
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buildsym_new_init ();
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}
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/* Perform any local cleanups required when we are done with a particular
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objfile. I.E, we are in the process of discarding all symbol information
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for an objfile, freeing up all memory held for it, and unlinking the
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objfile struct from the global list of known objfiles. */
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static void
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elf_symfile_finish (objfile)
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struct objfile *objfile;
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{
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if (objfile -> sym_private != NULL)
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{
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mfree (objfile -> md, objfile -> sym_private);
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}
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}
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/* ELF specific initialization routine for reading symbols.
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It is passed a pointer to a struct sym_fns which contains, among other
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things, the BFD for the file whose symbols are being read, and a slot for
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a pointer to "private data" which we can fill with goodies.
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For now at least, we have nothing in particular to do, so this function is
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just a stub. */
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static void
|
||
elf_symfile_init (ignore)
|
||
struct objfile *ignore;
|
||
{
|
||
}
|
||
|
||
/* ELF specific parsing routine for section offsets.
|
||
|
||
Plain and simple for now. */
|
||
|
||
static
|
||
struct section_offsets *
|
||
elf_symfile_offsets (objfile, addr)
|
||
struct objfile *objfile;
|
||
CORE_ADDR addr;
|
||
{
|
||
struct section_offsets *section_offsets;
|
||
int i;
|
||
|
||
section_offsets = (struct section_offsets *)
|
||
obstack_alloc (&objfile -> psymbol_obstack,
|
||
sizeof (struct section_offsets) +
|
||
sizeof (section_offsets->offsets) * (SECT_OFF_MAX-1));
|
||
|
||
for (i = 0; i < SECT_OFF_MAX; i++)
|
||
ANOFFSET (section_offsets, i) = addr;
|
||
|
||
return section_offsets;
|
||
}
|
||
|
||
/* 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 = (struct dbx_symfile_info *)
|
||
objfile->sym_private;
|
||
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 (struct section_offsets) +
|
||
sizeof (pst->section_offsets->offsets) * (SECT_OFF_MAX-1));
|
||
|
||
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);
|
||
}
|
||
|
||
/* 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 */
|
||
elf_symfile_finish, /* sym_finish: finished with file, cleanup */
|
||
elf_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */
|
||
NULL /* next: pointer to next struct sym_fns */
|
||
};
|
||
|
||
void
|
||
_initialize_elfread ()
|
||
{
|
||
add_symtab_fns (&elf_sym_fns);
|
||
}
|