Initial revision

1 files changed, 261 insertions, 0 deletions

diff --git a/gdb/nlmread.c b/gdb/nlmread.c
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+++ b/gdb/nlmread.c
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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"
+
+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 *));
+
+/* 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;
+{
+}
+
+/*
+
+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;
+{
+  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 (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;
+  struct symbol *mainsym;
+
+  init_minimal_symbol_collection ();
+  back_to = make_cleanup ((make_cleanup_func) 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);
+
+  stabsect_build_psymtabs (objfile, section_offsets, 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 (objfile)
+     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 ()
+{
+  add_symtab_fns (&nlm_sym_fns);
+}