Initial creation of sourceware repository

1 files changed, 988 insertions, 0 deletions

diff --git a/gdb/objfiles.c b/gdb/objfiles.c
new file mode 100644
index 0000000000..971a7d4de4
--- /dev/null
+++ b/gdb/objfiles.c
@@ -0,0 +1,988 @@
+/* GDB routines for manipulating objfiles.
+   Copyright 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
+   Contributed by Cygnus Support, using pieces from other GDB modules.
+
+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.  */
+
+/* This file contains support routines for creating, manipulating, and
+   destroying objfile structures. */
+
+#include "defs.h"
+#include "bfd.h"		/* Binary File Description */
+#include "symtab.h"
+#include "symfile.h"
+#include "objfiles.h"
+#include "gdb-stabs.h"
+#include "target.h"
+
+#include <sys/types.h>
+#include "gdb_stat.h"
+#include <fcntl.h>
+#include "obstack.h"
+#include "gdb_string.h"
+
+/* Prototypes for local functions */
+
+#if defined(USE_MMALLOC) && defined(HAVE_MMAP)
+
+static int
+open_existing_mapped_file PARAMS ((char *, long, int));
+
+static int
+open_mapped_file PARAMS ((char *filename, long mtime, int mapped));
+
+static PTR
+map_to_file PARAMS ((int));
+
+#endif  /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
+
+static void
+add_to_objfile_sections PARAMS ((bfd *, sec_ptr, PTR));
+
+/* Externally visible variables that are owned by this module.
+   See declarations in objfile.h for more info. */
+
+struct objfile *object_files;		/* Linked list of all objfiles */
+struct objfile *current_objfile;	/* For symbol file being read in */
+struct objfile *symfile_objfile;	/* Main symbol table loaded from */
+struct objfile *rt_common_objfile;	/* For runtime common symbols */
+
+int mapped_symbol_files;		/* Try to use mapped symbol files */
+
+/* Locate all mappable sections of a BFD file. 
+   objfile_p_char is a char * to get it through
+   bfd_map_over_sections; we cast it back to its proper type.  */
+
+#ifndef TARGET_KEEP_SECTION
+#define TARGET_KEEP_SECTION(ASECT)	0
+#endif
+
+static void
+add_to_objfile_sections (abfd, asect, objfile_p_char)
+     bfd *abfd;
+     sec_ptr asect;
+     PTR objfile_p_char;
+{
+  struct objfile *objfile = (struct objfile *) objfile_p_char;
+  struct obj_section section;
+  flagword aflag;
+
+  aflag = bfd_get_section_flags (abfd, asect);
+
+  if (!(aflag & SEC_ALLOC) && !(TARGET_KEEP_SECTION(asect)))
+    return;
+
+  if (0 == bfd_section_size (abfd, asect))
+    return;
+  section.offset = 0;
+  section.objfile = objfile;
+  section.the_bfd_section = asect;
+  section.ovly_mapped = 0;
+  section.addr = bfd_section_vma (abfd, asect);
+  section.endaddr = section.addr + bfd_section_size (abfd, asect);
+  obstack_grow (&objfile->psymbol_obstack, (char *) &section, sizeof(section));
+  objfile->sections_end = (struct obj_section *) (((unsigned long) objfile->sections_end) + 1);
+}
+
+/* Builds a section table for OBJFILE.
+   Returns 0 if OK, 1 on error (in which case bfd_error contains the
+   error).  */
+
+int
+build_objfile_section_table (objfile)
+     struct objfile *objfile;
+{
+  /* objfile->sections can be already set when reading a mapped symbol
+     file.  I believe that we do need to rebuild the section table in
+     this case (we rebuild other things derived from the bfd), but we
+     can't free the old one (it's in the psymbol_obstack).  So we just
+     waste some memory.  */
+
+  objfile->sections_end = 0;
+  bfd_map_over_sections (objfile->obfd, add_to_objfile_sections, (char *)objfile);
+  objfile->sections = (struct obj_section *)
+    obstack_finish (&objfile->psymbol_obstack);
+  objfile->sections_end = objfile->sections + (unsigned long) objfile->sections_end;
+  return(0);
+}
+
+/* Given a pointer to an initialized bfd (ABFD) and a flag that indicates
+   whether or not an objfile is to be mapped (MAPPED), allocate a new objfile
+   struct, fill it in as best we can, link it into the list of all known
+   objfiles, and return a pointer to the new objfile struct.
+
+   USER_LOADED is simply recorded in the objfile.  This record offers a way for
+   run_command to remove old objfile entries which are no longer valid (i.e.,
+   are associated with an old inferior), but to preserve ones that the user
+   explicitly loaded via the add-symbol-file command.
+
+   IS_SOLIB is also simply recorded in the objfile. */
+
+struct objfile *
+allocate_objfile (abfd, mapped, user_loaded, is_solib)
+     bfd *abfd;
+     int mapped;
+     int  user_loaded;
+     int  is_solib;
+{
+  struct objfile *objfile = NULL;
+  struct objfile *last_one = NULL;
+
+  mapped |= mapped_symbol_files;
+
+#if defined(USE_MMALLOC) && defined(HAVE_MMAP)
+  if (abfd != NULL)
+  {
+
+    /* If we can support mapped symbol files, try to open/reopen the
+       mapped file that corresponds to the file from which we wish to
+       read symbols.  If the objfile is to be mapped, we must malloc
+       the structure itself using the mmap version, and arrange that
+       all memory allocation for the objfile uses the mmap routines.
+       If we are reusing an existing mapped file, from which we get
+       our objfile pointer, we have to make sure that we update the
+       pointers to the alloc/free functions in the obstack, in case
+       these functions have moved within the current gdb.  */
+
+    int fd;
+
+    fd = open_mapped_file (bfd_get_filename (abfd), bfd_get_mtime (abfd),
+			   mapped);
+    if (fd >= 0)
+      {
+	PTR md;
+
+	if ((md = map_to_file (fd)) == NULL)
+	  {
+	    close (fd);
+	  }
+	else if ((objfile = (struct objfile *) mmalloc_getkey (md, 0)) != NULL)
+	  {
+	    /* Update memory corruption handler function addresses. */
+	    init_malloc (md);
+	    objfile -> md = md;
+	    objfile -> mmfd = fd;
+	    /* Update pointers to functions to *our* copies */
+	    obstack_chunkfun (&objfile -> psymbol_cache.cache, xmmalloc);
+	    obstack_freefun (&objfile -> psymbol_cache.cache, mfree);
+	    obstack_chunkfun (&objfile -> psymbol_obstack, xmmalloc);
+	    obstack_freefun (&objfile -> psymbol_obstack, mfree);
+	    obstack_chunkfun (&objfile -> symbol_obstack, xmmalloc);
+	    obstack_freefun (&objfile -> symbol_obstack, mfree);
+	    obstack_chunkfun (&objfile -> type_obstack, xmmalloc);
+	    obstack_freefun (&objfile -> type_obstack, mfree);
+	    /* If already in objfile list, unlink it. */
+	    unlink_objfile (objfile);
+	    /* Forget things specific to a particular gdb, may have changed. */
+	    objfile -> sf = NULL;
+	  }
+	else
+	  {
+
+	    /* Set up to detect internal memory corruption.  MUST be
+	       done before the first malloc.  See comments in
+	       init_malloc() and mmcheck().  */
+
+	    init_malloc (md);
+
+	    objfile = (struct objfile *)
+	      xmmalloc (md, sizeof (struct objfile));
+	    memset (objfile, 0, sizeof (struct objfile));
+	    objfile -> md = md;
+	    objfile -> mmfd = fd;
+	    objfile -> flags |= OBJF_MAPPED;
+	    mmalloc_setkey (objfile -> md, 0, objfile);
+	    obstack_specify_allocation_with_arg (&objfile -> psymbol_cache.cache,
+						 0, 0, xmmalloc, mfree,
+						 objfile -> md);
+	    obstack_specify_allocation_with_arg (&objfile -> psymbol_obstack,
+						 0, 0, xmmalloc, mfree,
+						 objfile -> md);
+	    obstack_specify_allocation_with_arg (&objfile -> symbol_obstack,
+						 0, 0, xmmalloc, mfree,
+						 objfile -> md);
+	    obstack_specify_allocation_with_arg (&objfile -> type_obstack,
+						 0, 0, xmmalloc, mfree,
+						 objfile -> md);
+	  }
+      }
+
+    if (mapped && (objfile == NULL))
+      {
+	warning ("symbol table for '%s' will not be mapped",
+		 bfd_get_filename (abfd));
+      }
+  }
+#else	/* !defined(USE_MMALLOC) || !defined(HAVE_MMAP) */
+
+  if (mapped)
+    {
+      warning ("mapped symbol tables are not supported on this machine; missing or broken mmap().");
+
+      /* Turn off the global flag so we don't try to do mapped symbol tables
+	 any more, which shuts up gdb unless the user specifically gives the
+	 "mapped" keyword again. */
+
+      mapped_symbol_files = 0;
+    }
+
+#endif	/* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
+
+  /* If we don't support mapped symbol files, didn't ask for the file to be
+     mapped, or failed to open the mapped file for some reason, then revert
+     back to an unmapped objfile. */
+
+  if (objfile == NULL)
+    {
+      objfile = (struct objfile *) xmalloc (sizeof (struct objfile));
+      memset (objfile, 0, sizeof (struct objfile));
+      objfile -> md = NULL;
+      obstack_specify_allocation (&objfile -> psymbol_cache.cache, 0, 0,
+				  xmalloc, free);
+      obstack_specify_allocation (&objfile -> psymbol_obstack, 0, 0, xmalloc,
+				  free);
+      obstack_specify_allocation (&objfile -> symbol_obstack, 0, 0, xmalloc,
+				  free);
+      obstack_specify_allocation (&objfile -> type_obstack, 0, 0, xmalloc,
+				  free);
+    }
+
+  /* Update the per-objfile information that comes from the bfd, ensuring
+     that any data that is reference is saved in the per-objfile data
+     region. */
+
+  objfile -> obfd = abfd;
+  if (objfile -> name != NULL)
+    {
+      mfree (objfile -> md, objfile -> name);
+    }
+  if (abfd != NULL)
+    {
+      objfile -> name = mstrsave (objfile -> md, bfd_get_filename (abfd));
+      objfile -> mtime = bfd_get_mtime (abfd);
+
+      /* Build section table.  */
+
+      if (build_objfile_section_table (objfile))
+	{
+	  error ("Can't find the file sections in `%s': %s", 
+		 objfile -> name, bfd_errmsg (bfd_get_error ()));
+	}
+    }
+
+  /* Add this file onto the tail of the linked list of other such files. */
+
+  objfile -> next = NULL;
+  if (object_files == NULL)
+    object_files = objfile;
+  else
+    {
+      for (last_one = object_files;
+	   last_one -> next;
+	   last_one = last_one -> next);
+      last_one -> next = objfile;
+    }
+
+  /* Record whether this objfile was created because the user explicitly
+     caused it (e.g., used the add-symbol-file command).
+     */
+  objfile -> user_loaded = user_loaded;
+
+  /* Record whether this objfile definitely represents a solib. */
+  objfile -> is_solib = is_solib;
+
+  return (objfile);
+}
+
+/* Put OBJFILE at the front of the list.  */
+
+void
+objfile_to_front (objfile)
+     struct objfile *objfile;
+{
+  struct objfile **objp;
+  for (objp = &object_files; *objp != NULL; objp = &((*objp)->next))
+    {
+      if (*objp == objfile)
+	{
+	  /* Unhook it from where it is.  */
+	  *objp = objfile->next;
+	  /* Put it in the front.  */
+	  objfile->next = object_files;
+	  object_files = objfile;
+	  break;
+	}
+    }
+}
+
+/* Unlink OBJFILE from the list of known objfiles, if it is found in the
+   list.
+
+   It is not a bug, or error, to call this function if OBJFILE is not known
+   to be in the current list.  This is done in the case of mapped objfiles,
+   for example, just to ensure that the mapped objfile doesn't appear twice
+   in the list.  Since the list is threaded, linking in a mapped objfile
+   twice would create a circular list.
+
+   If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
+   unlinking it, just to ensure that we have completely severed any linkages
+   between the OBJFILE and the list. */
+
+void
+unlink_objfile (objfile)
+     struct objfile *objfile;
+{
+  struct objfile** objpp;
+
+  for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp) -> next))
+    {
+      if (*objpp == objfile) 
+	{
+	  *objpp = (*objpp) -> next;
+	  objfile -> next = NULL;
+	  break;
+	}
+    }
+}
+
+
+/* Destroy an objfile and all the symtabs and psymtabs under it.  Note
+   that as much as possible is allocated on the symbol_obstack and
+   psymbol_obstack, so that the memory can be efficiently freed.
+
+   Things which we do NOT free because they are not in malloc'd memory
+   or not in memory specific to the objfile include:
+
+   	objfile -> sf
+
+   FIXME:  If the objfile is using reusable symbol information (via mmalloc),
+   then we need to take into account the fact that more than one process
+   may be using the symbol information at the same time (when mmalloc is
+   extended to support cooperative locking).  When more than one process
+   is using the mapped symbol info, we need to be more careful about when
+   we free objects in the reusable area. */
+
+void
+free_objfile (objfile)
+     struct objfile *objfile;
+{
+  /* First do any symbol file specific actions required when we are
+     finished with a particular symbol file.  Note that if the objfile
+     is using reusable symbol information (via mmalloc) then each of
+     these routines is responsible for doing the correct thing, either
+     freeing things which are valid only during this particular gdb
+     execution, or leaving them to be reused during the next one. */
+
+  if (objfile -> sf != NULL)
+    {
+      (*objfile -> sf -> sym_finish) (objfile);
+    }
+
+  /* We always close the bfd. */
+
+  if (objfile -> obfd != NULL)
+    {
+      char *name = bfd_get_filename (objfile->obfd);
+      if (!bfd_close (objfile -> obfd))
+	warning ("cannot close \"%s\": %s",
+		 name, bfd_errmsg (bfd_get_error ()));
+      free (name);
+    }
+
+  /* Remove it from the chain of all objfiles. */
+
+  unlink_objfile (objfile);
+
+  /* If we are going to free the runtime common objfile, mark it
+     as unallocated.  */
+
+  if (objfile == rt_common_objfile)
+    rt_common_objfile = NULL;
+
+  /* Before the symbol table code was redone to make it easier to
+     selectively load and remove information particular to a specific
+     linkage unit, gdb used to do these things whenever the monolithic
+     symbol table was blown away.  How much still needs to be done
+     is unknown, but we play it safe for now and keep each action until
+     it is shown to be no longer needed. */
+     
+#if defined (CLEAR_SOLIB)
+  CLEAR_SOLIB ();
+  /* CLEAR_SOLIB closes the bfd's for any shared libraries.  But
+     the to_sections for a core file might refer to those bfd's.  So
+     detach any core file.  */
+  {
+    struct target_ops *t = find_core_target ();
+    if (t != NULL)
+      (t->to_detach) (NULL, 0);
+  }
+#endif
+  /* I *think* all our callers call clear_symtab_users.  If so, no need
+     to call this here.  */
+  clear_pc_function_cache ();
+
+  /* The last thing we do is free the objfile struct itself for the
+     non-reusable case, or detach from the mapped file for the reusable
+     case.  Note that the mmalloc_detach or the mfree is the last thing
+     we can do with this objfile. */
+
+#if defined(USE_MMALLOC) && defined(HAVE_MMAP)
+
+  if (objfile -> flags & OBJF_MAPPED)
+    {
+      /* Remember the fd so we can close it.  We can't close it before
+	 doing the detach, and after the detach the objfile is gone. */
+      int mmfd;
+
+      mmfd = objfile -> mmfd;
+      mmalloc_detach (objfile -> md);
+      objfile = NULL;
+      close (mmfd);
+    }
+
+#endif	/* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
+
+  /* If we still have an objfile, then either we don't support reusable
+     objfiles or this one was not reusable.  So free it normally. */
+
+  if (objfile != NULL)
+    {
+      if (objfile -> name != NULL)
+	{
+	  mfree (objfile -> md, objfile -> name);
+	}
+      if (objfile->global_psymbols.list)
+	mfree (objfile->md, objfile->global_psymbols.list);
+      if (objfile->static_psymbols.list)
+	mfree (objfile->md, objfile->static_psymbols.list);
+      /* Free the obstacks for non-reusable objfiles */
+      obstack_free (&objfile -> psymbol_cache.cache, 0);
+      obstack_free (&objfile -> psymbol_obstack, 0);
+      obstack_free (&objfile -> symbol_obstack, 0);
+      obstack_free (&objfile -> type_obstack, 0);
+      mfree (objfile -> md, objfile);
+      objfile = NULL;
+    }
+}
+
+
+/* Free all the object files at once and clean up their users.  */
+
+void
+free_all_objfiles ()
+{
+  struct objfile *objfile, *temp;
+
+  ALL_OBJFILES_SAFE (objfile, temp)
+    {
+      free_objfile (objfile);
+    }
+  clear_symtab_users ();
+}
+
+/* Relocate OBJFILE to NEW_OFFSETS.  There should be OBJFILE->NUM_SECTIONS
+   entries in new_offsets.  */
+void
+objfile_relocate (objfile, new_offsets)
+     struct objfile *objfile;
+     struct section_offsets *new_offsets;
+{
+  struct section_offsets *delta = (struct section_offsets *) 
+    alloca (sizeof (struct section_offsets)
+	    + objfile->num_sections * sizeof (delta->offsets));
+
+  {
+    int i;
+    int something_changed = 0;
+    for (i = 0; i < objfile->num_sections; ++i)
+      {
+	ANOFFSET (delta, i) =
+	  ANOFFSET (new_offsets, i) - ANOFFSET (objfile->section_offsets, i);
+	if (ANOFFSET (delta, i) != 0)
+	  something_changed = 1;
+      }
+    if (!something_changed)
+      return;
+  }
+
+  /* OK, get all the symtabs.  */
+  {
+    struct symtab *s;
+
+    ALL_OBJFILE_SYMTABS (objfile, s)
+      {
+	struct linetable *l;
+	struct blockvector *bv;
+	int i;
+	
+	/* First the line table.  */
+	l = LINETABLE (s);
+	if (l)
+	  {
+	    for (i = 0; i < l->nitems; ++i)
+	      l->item[i].pc += ANOFFSET (delta, s->block_line_section);
+	  }
+
+	/* Don't relocate a shared blockvector more than once.  */
+	if (!s->primary)
+	  continue;
+
+	bv = BLOCKVECTOR (s);
+	for (i = 0; i < BLOCKVECTOR_NBLOCKS (bv); ++i)
+	  {
+	    struct block *b;
+	    int j;
+	    
+	    b = BLOCKVECTOR_BLOCK (bv, i);
+	    BLOCK_START (b) += ANOFFSET (delta, s->block_line_section);
+	    BLOCK_END (b)   += ANOFFSET (delta, s->block_line_section);
+
+	    for (j = 0; j < BLOCK_NSYMS (b); ++j)
+	      {
+		struct symbol *sym = BLOCK_SYM (b, j);
+		/* The RS6000 code from which this was taken skipped
+		   any symbols in STRUCT_NAMESPACE or UNDEF_NAMESPACE.
+		   But I'm leaving out that test, on the theory that
+		   they can't possibly pass the tests below.  */
+		if ((SYMBOL_CLASS (sym) == LOC_LABEL
+		     || SYMBOL_CLASS (sym) == LOC_STATIC 
+                     || SYMBOL_CLASS (sym) == LOC_INDIRECT)
+		    && SYMBOL_SECTION (sym) >= 0)
+		  {
+		    SYMBOL_VALUE_ADDRESS (sym) += 
+		      ANOFFSET (delta, SYMBOL_SECTION (sym));
+		  }
+#ifdef MIPS_EFI_SYMBOL_NAME
+		/* Relocate Extra Function Info for ecoff.  */
+
+		else
+		  if (SYMBOL_CLASS (sym) == LOC_CONST
+		      && SYMBOL_NAMESPACE (sym) == LABEL_NAMESPACE
+		      && STRCMP (SYMBOL_NAME (sym), MIPS_EFI_SYMBOL_NAME) == 0)
+		ecoff_relocate_efi (sym, ANOFFSET (delta, 
+						   s->block_line_section));
+#endif
+	      }
+	  }
+      }
+  }
+
+  {
+    struct partial_symtab *p;
+
+    ALL_OBJFILE_PSYMTABS (objfile, p)
+      {
+	p->textlow += ANOFFSET (delta, SECT_OFF_TEXT);
+	p->texthigh += ANOFFSET (delta, SECT_OFF_TEXT);
+      }
+  }
+
+  {
+    struct partial_symbol **psym;
+
+    for (psym = objfile->global_psymbols.list;
+	 psym < objfile->global_psymbols.next;
+	 psym++)
+      if (SYMBOL_SECTION (*psym) >= 0)
+	SYMBOL_VALUE_ADDRESS (*psym) += ANOFFSET (delta, 
+						  SYMBOL_SECTION (*psym));
+    for (psym = objfile->static_psymbols.list;
+	 psym < objfile->static_psymbols.next;
+	 psym++)
+      if (SYMBOL_SECTION (*psym) >= 0)
+	SYMBOL_VALUE_ADDRESS (*psym) += ANOFFSET (delta, 
+						  SYMBOL_SECTION (*psym));
+  }
+
+  {
+    struct minimal_symbol *msym;
+    ALL_OBJFILE_MSYMBOLS (objfile, msym)
+      if (SYMBOL_SECTION (msym) >= 0)
+	SYMBOL_VALUE_ADDRESS (msym) += ANOFFSET (delta, SYMBOL_SECTION (msym));
+  }
+  /* Relocating different sections by different amounts may cause the symbols
+     to be out of order.  */
+  msymbols_sort (objfile);
+
+  {
+    int i;
+    for (i = 0; i < objfile->num_sections; ++i)
+      ANOFFSET (objfile->section_offsets, i) = ANOFFSET (new_offsets, i);
+  }
+
+  {
+    struct obj_section *s;
+    bfd *abfd;
+
+    abfd = objfile->obfd;
+
+    for (s = objfile->sections;
+	 s < objfile->sections_end; ++s)
+      {
+	flagword flags;
+
+	flags = bfd_get_section_flags (abfd, s->the_bfd_section);
+
+	if (flags & SEC_CODE)
+	  {
+	    s->addr    += ANOFFSET (delta, SECT_OFF_TEXT);
+	    s->endaddr += ANOFFSET (delta, SECT_OFF_TEXT);
+	  }
+	else if (flags & (SEC_DATA | SEC_LOAD))
+	  {
+	    s->addr    += ANOFFSET (delta, SECT_OFF_DATA);
+	    s->endaddr += ANOFFSET (delta, SECT_OFF_DATA);
+	  }
+	else if (flags & SEC_ALLOC)
+	  {
+	    s->addr    += ANOFFSET (delta, SECT_OFF_BSS);
+	    s->endaddr += ANOFFSET (delta, SECT_OFF_BSS);
+	  }
+      }
+  }
+
+  if (objfile->ei.entry_point != ~(CORE_ADDR)0)
+    objfile->ei.entry_point += ANOFFSET (delta, SECT_OFF_TEXT);
+
+  if (objfile->ei.entry_func_lowpc != INVALID_ENTRY_LOWPC)
+    {
+      objfile->ei.entry_func_lowpc  += ANOFFSET (delta, SECT_OFF_TEXT);
+      objfile->ei.entry_func_highpc += ANOFFSET (delta, SECT_OFF_TEXT);
+    }
+
+  if (objfile->ei.entry_file_lowpc != INVALID_ENTRY_LOWPC)
+    {
+      objfile->ei.entry_file_lowpc  += ANOFFSET (delta, SECT_OFF_TEXT);
+      objfile->ei.entry_file_highpc += ANOFFSET (delta, SECT_OFF_TEXT);
+    }
+
+  if (objfile->ei.main_func_lowpc != INVALID_ENTRY_LOWPC)
+    {
+      objfile->ei.main_func_lowpc  += ANOFFSET (delta, SECT_OFF_TEXT);
+      objfile->ei.main_func_highpc += ANOFFSET (delta, SECT_OFF_TEXT);
+    }
+
+  /* Relocate breakpoints as necessary, after things are relocated. */
+  breakpoint_re_set ();
+}
+
+/* Many places in gdb want to test just to see if we have any partial
+   symbols available.  This function returns zero if none are currently
+   available, nonzero otherwise. */
+
+int
+have_partial_symbols ()
+{
+  struct objfile *ofp;
+
+  ALL_OBJFILES (ofp)
+    {
+      if (ofp -> psymtabs != NULL)
+	{
+	  return 1;
+	}
+    }
+  return 0;
+}
+
+/* Many places in gdb want to test just to see if we have any full
+   symbols available.  This function returns zero if none are currently
+   available, nonzero otherwise. */
+
+int
+have_full_symbols ()
+{
+  struct objfile *ofp;
+
+  ALL_OBJFILES (ofp)
+    {
+      if (ofp -> symtabs != NULL)
+	{
+	  return 1;
+	}
+    }
+  return 0;
+}
+
+
+/* This operations deletes all objfile entries that represent solibs that
+   weren't explicitly loaded by the user, via e.g., the add-symbol-file
+   command.
+   */
+void
+objfile_purge_solibs ()
+{
+  struct objfile *  objf;
+  struct objfile *  temp;
+
+  ALL_OBJFILES_SAFE (objf, temp)
+  {
+    /* We assume that the solib package has been purged already, or will
+       be soon.
+       */
+    if (! objf->user_loaded && objf->is_solib)
+      free_objfile (objf);
+  }
+}
+
+
+/* Many places in gdb want to test just to see if we have any minimal
+   symbols available.  This function returns zero if none are currently
+   available, nonzero otherwise. */
+
+int
+have_minimal_symbols ()
+{
+  struct objfile *ofp;
+
+  ALL_OBJFILES (ofp)
+    {
+      if (ofp -> msymbols != NULL)
+	{
+	  return 1;
+	}
+    }
+  return 0;
+}
+
+#if defined(USE_MMALLOC) && defined(HAVE_MMAP)
+
+/* Given the name of a mapped symbol file in SYMSFILENAME, and the timestamp
+   of the corresponding symbol file in MTIME, try to open an existing file
+   with the name SYMSFILENAME and verify it is more recent than the base
+   file by checking it's timestamp against MTIME.
+
+   If SYMSFILENAME does not exist (or can't be stat'd), simply returns -1.
+
+   If SYMSFILENAME does exist, but is out of date, we check to see if the
+   user has specified creation of a mapped file.  If so, we don't issue
+   any warning message because we will be creating a new mapped file anyway,
+   overwriting the old one.  If not, then we issue a warning message so that
+   the user will know why we aren't using this existing mapped symbol file.
+   In either case, we return -1.
+
+   If SYMSFILENAME does exist and is not out of date, but can't be opened for
+   some reason, then prints an appropriate system error message and returns -1.
+
+   Otherwise, returns the open file descriptor.  */
+
+static int
+open_existing_mapped_file (symsfilename, mtime, mapped)
+     char *symsfilename;
+     long mtime;
+     int mapped;
+{
+  int fd = -1;
+  struct stat sbuf;
+
+  if (stat (symsfilename, &sbuf) == 0)
+    {
+      if (sbuf.st_mtime < mtime)
+	{
+	  if (!mapped)
+	    {
+	      warning ("mapped symbol file `%s' is out of date, ignored it",
+		       symsfilename);
+	    }
+	}
+      else if ((fd = open (symsfilename, O_RDWR)) < 0)
+	{
+	  if (error_pre_print)
+	    {
+	      printf_unfiltered (error_pre_print);
+	    }
+	  print_sys_errmsg (symsfilename, errno);
+	}
+    }
+  return (fd);
+}
+
+/* Look for a mapped symbol file that corresponds to FILENAME and is more
+   recent than MTIME.  If MAPPED is nonzero, the user has asked that gdb
+   use a mapped symbol file for this file, so create a new one if one does
+   not currently exist.
+
+   If found, then return an open file descriptor for the file, otherwise
+   return -1.
+
+   This routine is responsible for implementing the policy that generates
+   the name of the mapped symbol file from the name of a file containing
+   symbols that gdb would like to read.  Currently this policy is to append
+   ".syms" to the name of the file.
+
+   This routine is also responsible for implementing the policy that
+   determines where the mapped symbol file is found (the search path).
+   This policy is that when reading an existing mapped file, a file of
+   the correct name in the current directory takes precedence over a
+   file of the correct name in the same directory as the symbol file.
+   When creating a new mapped file, it is always created in the current
+   directory.  This helps to minimize the chances of a user unknowingly
+   creating big mapped files in places like /bin and /usr/local/bin, and
+   allows a local copy to override a manually installed global copy (in
+   /bin for example).  */
+
+static int
+open_mapped_file (filename, mtime, mapped)
+     char *filename;
+     long mtime;
+     int mapped;
+{
+  int fd;
+  char *symsfilename;
+
+  /* First try to open an existing file in the current directory, and
+     then try the directory where the symbol file is located. */
+
+  symsfilename = concat ("./", basename (filename), ".syms", (char *) NULL);
+  if ((fd = open_existing_mapped_file (symsfilename, mtime, mapped)) < 0)
+    {
+      free (symsfilename);
+      symsfilename = concat (filename, ".syms", (char *) NULL);
+      fd = open_existing_mapped_file (symsfilename, mtime, mapped);
+    }
+
+  /* If we don't have an open file by now, then either the file does not
+     already exist, or the base file has changed since it was created.  In
+     either case, if the user has specified use of a mapped file, then
+     create a new mapped file, truncating any existing one.  If we can't
+     create one, print a system error message saying why we can't.
+
+     By default the file is rw for everyone, with the user's umask taking
+     care of turning off the permissions the user wants off. */
+
+  if ((fd < 0) && mapped)
+    {
+      free (symsfilename);
+      symsfilename = concat ("./", basename (filename), ".syms",
+			     (char *) NULL);
+      if ((fd = open (symsfilename, O_RDWR | O_CREAT | O_TRUNC, 0666)) < 0)
+	{
+	  if (error_pre_print)
+	    {
+	      printf_unfiltered (error_pre_print);
+	    }
+	  print_sys_errmsg (symsfilename, errno);
+	}
+    }
+
+  free (symsfilename);
+  return (fd);
+}
+
+static PTR
+map_to_file (fd)
+     int fd;
+{
+  PTR md;
+  CORE_ADDR mapto;
+
+  md = mmalloc_attach (fd, (PTR) 0);
+  if (md != NULL)
+    {
+      mapto = (CORE_ADDR) mmalloc_getkey (md, 1);
+      md = mmalloc_detach (md);
+      if (md != NULL)
+	{
+	  /* FIXME: should figure out why detach failed */
+	  md = NULL;
+	}
+      else if (mapto != (CORE_ADDR) NULL)
+	{
+	  /* This mapping file needs to be remapped at "mapto" */
+	  md = mmalloc_attach (fd, (PTR) mapto);
+	}
+      else
+	{
+	  /* This is a freshly created mapping file. */
+	  mapto = (CORE_ADDR) mmalloc_findbase (20 * 1024 * 1024);
+	  if (mapto != 0)
+	    {
+	      /* To avoid reusing the freshly created mapping file, at the 
+		 address selected by mmap, we must truncate it before trying
+		 to do an attach at the address we want. */
+	      ftruncate (fd, 0);
+	      md = mmalloc_attach (fd, (PTR) mapto);
+	      if (md != NULL)
+		{
+		  mmalloc_setkey (md, 1, (PTR) mapto);
+		}
+	    }
+	}
+    }
+  return (md);
+}
+
+#endif	/* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
+
+/* Returns a section whose range includes PC and SECTION, 
+   or NULL if none found.  Note the distinction between the return type, 
+   struct obj_section (which is defined in gdb), and the input type
+   struct sec (which is a bfd-defined data type).  The obj_section
+   contains a pointer to the bfd struct sec section.  */
+
+struct obj_section *
+find_pc_sect_section (pc, section)
+     CORE_ADDR pc;
+     struct sec *section;
+{
+  struct obj_section *s;
+  struct objfile *objfile;
+  
+  ALL_OBJFILES (objfile)
+    for (s = objfile->sections; s < objfile->sections_end; ++s)
+#if defined(HPUXHPPA)
+      if ((section == 0 || section == s->the_bfd_section) && 
+	  s->addr <= pc && pc <= s->endaddr)
+#else
+      if ((section == 0 || section == s->the_bfd_section) && 
+	  s->addr <= pc && pc < s->endaddr)
+#endif
+	return(s);
+
+  return(NULL);
+}
+
+/* Returns a section whose range includes PC or NULL if none found. 
+   Backward compatibility, no section.  */
+
+struct obj_section *
+find_pc_section(pc)
+     CORE_ADDR pc;
+{
+  return find_pc_sect_section (pc, find_pc_mapped_section (pc));
+}
+  
+
+/* In SVR4, we recognize a trampoline by it's section name. 
+   That is, if the pc is in a section named ".plt" then we are in
+   a trampoline.  */
+
+int
+in_plt_section(pc, name)
+     CORE_ADDR pc;
+     char *name;
+{
+  struct obj_section *s;
+  int retval = 0;
+  
+  s = find_pc_section(pc);
+  
+  retval = (s != NULL
+	    && s->the_bfd_section->name != NULL
+	    && STREQ (s->the_bfd_section->name, ".plt"));
+  return(retval);
+}