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/* Read NLM (NetWare Loadable Module) format executable files for GDB.
Copyright 1993, 1994, 1998 Free Software Foundation, Inc.
Written by Fred Fish at Cygnus Support (fnf@cygnus.com).
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 "gdb_string.h"
#include "bfd.h"
#include "symtab.h"
#include "symfile.h"
#include "objfiles.h"
#include "gdb-stabs.h"
#include "buildsym.h"
#include "stabsread.h"
extern void _initialize_nlmread (void);
static void nlm_new_init (struct objfile *);
static void nlm_symfile_init (struct objfile *);
static void nlm_symfile_read (struct objfile *, int);
static void nlm_symfile_finish (struct objfile *);
static void nlm_symtab_read (bfd *, CORE_ADDR, struct objfile *);
/* 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 gdb will be able to read stabs from an NLM
file at some point in the near future. */
static void
nlm_new_init (struct objfile *ignore)
{
stabsread_new_init ();
buildsym_new_init ();
}
/* NLM 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
nlm_symfile_init (struct objfile *ignore)
{
}
/*
LOCAL FUNCTION
nlm_symtab_read -- read the symbol table of an NLM file
SYNOPSIS
void nlm_symtab_read (bfd *abfd, CORE_ADDR addr,
struct objfile *objfile)
DESCRIPTION
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 minimal symbol table.
*/
static void
nlm_symtab_read (bfd *abfd, CORE_ADDR addr, struct objfile *objfile)
{
long storage_needed;
asymbol *sym;
asymbol **symbol_table;
long number_of_symbols;
long i;
struct cleanup *back_to;
CORE_ADDR symaddr;
enum minimal_symbol_type ms_type;
storage_needed = bfd_get_symtab_upper_bound (abfd);
if (storage_needed < 0)
error ("Can't read symbols from %s: %s", bfd_get_filename (abfd),
bfd_errmsg (bfd_get_error ()));
if (storage_needed > 0)
{
symbol_table = (asymbol **) xmalloc (storage_needed);
back_to = make_cleanup (free, symbol_table);
number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
if (number_of_symbols < 0)
error ("Can't read symbols from %s: %s", bfd_get_filename (abfd),
bfd_errmsg (bfd_get_error ()));
for (i = 0; i < number_of_symbols; i++)
{
sym = symbol_table[i];
if ( /*sym -> flags & BSF_GLOBAL */ 1)
{
/* Bfd symbols are section relative. */
symaddr = sym->value + sym->section->vma;
/* Relocate all non-absolute symbols by base address. */
if (sym->section != &bfd_abs_section)
symaddr += addr;
/* 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)
ms_type = mst_text;
else if (sym->section->flags & SEC_DATA)
ms_type = mst_data;
else
ms_type = mst_unknown;
prim_record_minimal_symbol (sym->name, symaddr, ms_type,
objfile);
}
}
do_cleanups (back_to);
}
}
/* Scan and build partial symbols for a symbol file.
We have been initialized by a call to nlm_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.
Note that NLM files have two sets of information that is potentially
useful for building gdb's minimal symbol table. The first is a list
of the publically exported symbols, and is currently used to build
bfd's canonical symbol table. The second is an optional native debugging
format which contains additional symbols (and possibly duplicates of
the publically exported symbols). The optional native debugging format
is not currently used. */
static void
nlm_symfile_read (struct objfile *objfile, int mainline)
{
bfd *abfd = objfile->obfd;
struct cleanup *back_to;
CORE_ADDR offset;
struct symbol *mainsym;
init_minimal_symbol_collection ();
back_to = make_cleanup_discard_minimal_symbols ();
/* FIXME, should take a section_offsets param, not just an offset. */
offset = ANOFFSET (objfile->section_offsets, 0);
/* Process the NLM export records, which become the bfd's canonical symbol
table. */
nlm_symtab_read (abfd, offset, objfile);
stabsect_build_psymtabs (objfile, mainline, ".stab",
".stabstr", ".text");
mainsym = lookup_symbol ("main", NULL, VAR_NAMESPACE, NULL, NULL);
if (mainsym
&& SYMBOL_CLASS (mainsym) == LOC_BLOCK)
{
objfile->ei.main_func_lowpc = BLOCK_START (SYMBOL_BLOCK_VALUE (mainsym));
objfile->ei.main_func_highpc = BLOCK_END (SYMBOL_BLOCK_VALUE (mainsym));
}
/* FIXME: We could locate and read the optional native debugging format
here and add the symbols to the minimal symbol table. */
/* Install any minimal symbols that have been collected as the current
minimal symbols for this objfile. */
install_minimal_symbols (objfile);
do_cleanups (back_to);
}
/* 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
nlm_symfile_finish (struct objfile *objfile)
{
if (objfile->sym_private != NULL)
{
mfree (objfile->md, objfile->sym_private);
}
}
/* Register that we are able to handle NLM file format. */
static struct sym_fns nlm_sym_fns =
{
bfd_target_nlm_flavour,
nlm_new_init, /* sym_new_init: init anything gbl to entire symtab */
nlm_symfile_init, /* sym_init: read initial info, setup for sym_read() */
nlm_symfile_read, /* sym_read: read a symbol file into symtab */
nlm_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_nlmread (void)
{
add_symtab_fns (&nlm_sym_fns);
}
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