--- /dev/null
+/* Read NLM (NetWare Loadable Module) format executable files for GDB.
+ Copyright 1993 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "defs.h"
+#include "bfd.h"
+#include "symtab.h"
+#include "symfile.h"
+#include "objfiles.h"
+#include "gdb-stabs.h"
+
+static void
+nlm_new_init PARAMS ((struct objfile *));
+
+static void
+nlm_symfile_init PARAMS ((struct objfile *));
+
+static void
+nlm_symfile_read PARAMS ((struct objfile *, struct section_offsets *, int));
+
+static void
+nlm_symfile_finish PARAMS ((struct objfile *));
+
+static void
+nlm_symtab_read PARAMS ((bfd *, CORE_ADDR, struct objfile *));
+
+static struct section_offsets *
+nlm_symfile_offsets PARAMS ((struct objfile *, CORE_ADDR));
+
+static void
+record_minimal_symbol PARAMS ((char *, CORE_ADDR, enum minimal_symbol_type,
+ 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 (ignore)
+ 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 (ignore)
+ struct objfile *ignore;
+{
+}
+
+static void
+record_minimal_symbol (name, address, ms_type, objfile)
+ char *name;
+ CORE_ADDR address;
+ enum minimal_symbol_type ms_type;
+ struct objfile *objfile;
+{
+ name = obsavestring (name, strlen (name), &objfile -> symbol_obstack);
+ prim_record_minimal_symbol (name, address, ms_type);
+}
+
+
+/*
+
+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 (abfd, addr, objfile)
+ bfd *abfd;
+ CORE_ADDR addr;
+ struct objfile *objfile;
+{
+ unsigned int storage_needed;
+ asymbol *sym;
+ asymbol **symbol_table;
+ unsigned int number_of_symbols;
+ unsigned int i;
+ int index;
+ struct cleanup *back_to;
+ CORE_ADDR symaddr;
+ enum minimal_symbol_type ms_type;
+
+ storage_needed = get_symtab_upper_bound (abfd);
+ 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);
+
+ for (i = 0; i < number_of_symbols; i++)
+ {
+ sym = symbol_table[i];
+ if (sym -> flags & BSF_GLOBAL)
+ {
+ /* 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;
+ }
+ record_minimal_symbol ((char *) 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 (objfile, section_offsets, mainline)
+ struct objfile *objfile;
+ struct section_offsets *section_offsets;
+ int mainline;
+{
+ bfd *abfd = objfile -> obfd;
+ struct cleanup *back_to;
+ CORE_ADDR offset;
+
+ init_minimal_symbol_collection ();
+ back_to = make_cleanup (discard_minimal_symbols, 0);
+
+ /* FIXME, should take a section_offsets param, not just an offset. */
+
+ offset = ANOFFSET (section_offsets, 0);
+
+ /* Process the NLM export records, which become the bfd's canonical symbol
+ table. */
+
+ nlm_symtab_read (abfd, offset, objfile);
+
+ /* FIXME: We could locate and read the optional native debugging format
+ here and add the symbols to the minimal symbol table. */
+
+ if (!have_partial_symbols ())
+ {
+ wrap_here ("");
+ printf_filtered ("(no debugging symbols found)...");
+ wrap_here ("");
+ }
+
+ /* 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 (objfile)
+ struct objfile *objfile;
+{
+ if (objfile -> sym_private != NULL)
+ {
+ mfree (objfile -> md, objfile -> sym_private);
+ }
+}
+
+/* NLM specific parsing routine for section offsets.
+ FIXME: This may or may not be necessary. All the symbol readers seem
+ to have similar code. See if it can be generalized and moved elsewhere. */
+
+static
+struct section_offsets *
+nlm_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);
+}
+
+\f
+/* Register that we are able to handle NLM file format. */
+
+static struct sym_fns nlm_sym_fns =
+{
+ "nlm", /* sym_name: name or name prefix of BFD target type */
+ 3, /* sym_namelen: number of significant sym_name chars */
+ 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 */
+ nlm_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */
+ NULL /* next: pointer to next struct sym_fns */
+};
+
+void
+_initialize_nlmread ()
+{
+ add_symtab_fns (&nlm_sym_fns);
+}
projects / binutils-gdb.git / commitdiff