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binutils-gdb/gdb/elfread.c

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/* Read ELF (Executable and Linking Format) object files for GDB.
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., 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 PARAMS ((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
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
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 (ignore_abfd, sectp, eip)
bfd *ignore_abfd;
asection *sectp;
PTR 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 (abfd)
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 (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;
/* 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;
}
return prim_record_minimal_symbol_and_info
(name, address, ms_type, info, section, 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 (objfile, dynamic)
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 (free, 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 ()));
/* FIXME: Should use section specific offset, not SECT_OFF_TEXT. */
offset = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT);
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;
}
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)
{
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 (&section_info_complaint,
sym->name);
}
else
{
sectinfo->filename =
(char *) filesym->name;
}
}
if (sectinfo->sections[index] != 0)
{
complain (&section_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
{
/* 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, (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);
}
}
/* 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 (objfile, mainline)
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 ((make_cleanup_func) discard_minimal_symbols, 0);
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, (PTR) 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, (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)
{
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);
}
/* 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).
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
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.
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 (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);
}
/* 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 ()
{
add_symtab_fns (&elf_sym_fns);
}
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