937 lines
27 KiB
C
937 lines
27 KiB
C
/* GDB routines for manipulating objfiles.
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Copyright 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
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Contributed by Cygnus Support, using pieces from other GDB modules.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* This file contains support routines for creating, manipulating, and
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destroying objfile structures. */
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#include "defs.h"
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#include "bfd.h" /* Binary File Description */
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#include "symtab.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "gdb-stabs.h"
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#include "target.h"
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#include <sys/types.h>
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#include "gdb_stat.h"
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#include <fcntl.h>
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#include "obstack.h"
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#include "gdb_string.h"
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/* Prototypes for local functions */
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#if defined(USE_MMALLOC) && defined(HAVE_MMAP)
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static int
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open_existing_mapped_file PARAMS ((char *, long, int));
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static int
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open_mapped_file PARAMS ((char *filename, long mtime, int mapped));
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static PTR
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map_to_file PARAMS ((int));
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#endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
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static void
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add_to_objfile_sections PARAMS ((bfd *, sec_ptr, PTR));
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/* Externally visible variables that are owned by this module.
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See declarations in objfile.h for more info. */
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struct objfile *object_files; /* Linked list of all objfiles */
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struct objfile *current_objfile; /* For symbol file being read in */
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struct objfile *symfile_objfile; /* Main symbol table loaded from */
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struct objfile *rt_common_objfile; /* For runtime common symbols */
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int mapped_symbol_files; /* Try to use mapped symbol files */
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/* Locate all mappable sections of a BFD file.
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objfile_p_char is a char * to get it through
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bfd_map_over_sections; we cast it back to its proper type. */
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static void
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add_to_objfile_sections (abfd, asect, objfile_p_char)
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bfd *abfd;
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sec_ptr asect;
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PTR objfile_p_char;
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{
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struct objfile *objfile = (struct objfile *) objfile_p_char;
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struct obj_section section;
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flagword aflag;
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aflag = bfd_get_section_flags (abfd, asect);
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if (!(aflag & SEC_ALLOC))
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return;
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if (0 == bfd_section_size (abfd, asect))
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return;
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section.offset = 0;
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section.objfile = objfile;
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section.the_bfd_section = asect;
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section.ovly_mapped = 0;
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section.addr = bfd_section_vma (abfd, asect);
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section.endaddr = section.addr + bfd_section_size (abfd, asect);
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obstack_grow (&objfile->psymbol_obstack, (char *) §ion, sizeof(section));
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objfile->sections_end = (struct obj_section *) (((unsigned long) objfile->sections_end) + 1);
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}
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/* Builds a section table for OBJFILE.
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Returns 0 if OK, 1 on error (in which case bfd_error contains the
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error). */
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int
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build_objfile_section_table (objfile)
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struct objfile *objfile;
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{
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/* objfile->sections can be already set when reading a mapped symbol
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file. I believe that we do need to rebuild the section table in
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this case (we rebuild other things derived from the bfd), but we
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can't free the old one (it's in the psymbol_obstack). So we just
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waste some memory. */
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objfile->sections_end = 0;
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bfd_map_over_sections (objfile->obfd, add_to_objfile_sections, (char *)objfile);
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objfile->sections = (struct obj_section *)
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obstack_finish (&objfile->psymbol_obstack);
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objfile->sections_end = objfile->sections + (unsigned long) objfile->sections_end;
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return(0);
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}
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/* Given a pointer to an initialized bfd (ABFD) and a flag that indicates
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whether or not an objfile is to be mapped (MAPPED), allocate a new objfile
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struct, fill it in as best we can, link it into the list of all known
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objfiles, and return a pointer to the new objfile struct. */
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struct objfile *
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allocate_objfile (abfd, mapped)
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bfd *abfd;
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int mapped;
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{
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struct objfile *objfile = NULL;
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struct objfile *last_one = NULL;
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mapped |= mapped_symbol_files;
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#if defined(USE_MMALLOC) && defined(HAVE_MMAP)
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if (abfd != NULL)
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{
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/* If we can support mapped symbol files, try to open/reopen the
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mapped file that corresponds to the file from which we wish to
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read symbols. If the objfile is to be mapped, we must malloc
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the structure itself using the mmap version, and arrange that
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all memory allocation for the objfile uses the mmap routines.
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If we are reusing an existing mapped file, from which we get
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our objfile pointer, we have to make sure that we update the
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pointers to the alloc/free functions in the obstack, in case
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these functions have moved within the current gdb. */
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int fd;
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fd = open_mapped_file (bfd_get_filename (abfd), bfd_get_mtime (abfd),
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mapped);
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if (fd >= 0)
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{
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PTR md;
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if ((md = map_to_file (fd)) == NULL)
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{
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close (fd);
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}
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else if ((objfile = (struct objfile *) mmalloc_getkey (md, 0)) != NULL)
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{
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/* Update memory corruption handler function addresses. */
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init_malloc (md);
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objfile -> md = md;
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objfile -> mmfd = fd;
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/* Update pointers to functions to *our* copies */
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obstack_chunkfun (&objfile -> psymbol_cache.cache, xmmalloc);
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obstack_freefun (&objfile -> psymbol_cache.cache, mfree);
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obstack_chunkfun (&objfile -> psymbol_obstack, xmmalloc);
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obstack_freefun (&objfile -> psymbol_obstack, mfree);
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obstack_chunkfun (&objfile -> symbol_obstack, xmmalloc);
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obstack_freefun (&objfile -> symbol_obstack, mfree);
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obstack_chunkfun (&objfile -> type_obstack, xmmalloc);
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obstack_freefun (&objfile -> type_obstack, mfree);
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/* If already in objfile list, unlink it. */
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unlink_objfile (objfile);
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/* Forget things specific to a particular gdb, may have changed. */
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objfile -> sf = NULL;
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}
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else
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{
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/* Set up to detect internal memory corruption. MUST be
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done before the first malloc. See comments in
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init_malloc() and mmcheck(). */
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init_malloc (md);
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objfile = (struct objfile *)
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xmmalloc (md, sizeof (struct objfile));
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memset (objfile, 0, sizeof (struct objfile));
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objfile -> md = md;
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objfile -> mmfd = fd;
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objfile -> flags |= OBJF_MAPPED;
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mmalloc_setkey (objfile -> md, 0, objfile);
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obstack_specify_allocation_with_arg (&objfile -> psymbol_cache.cache,
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0, 0, xmmalloc, mfree,
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objfile -> md);
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obstack_specify_allocation_with_arg (&objfile -> psymbol_obstack,
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0, 0, xmmalloc, mfree,
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objfile -> md);
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obstack_specify_allocation_with_arg (&objfile -> symbol_obstack,
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0, 0, xmmalloc, mfree,
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objfile -> md);
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obstack_specify_allocation_with_arg (&objfile -> type_obstack,
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0, 0, xmmalloc, mfree,
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objfile -> md);
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}
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}
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if (mapped && (objfile == NULL))
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{
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warning ("symbol table for '%s' will not be mapped",
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bfd_get_filename (abfd));
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}
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}
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#else /* !defined(USE_MMALLOC) || !defined(HAVE_MMAP) */
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if (mapped)
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{
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warning ("mapped symbol tables are not supported on this machine; missing or broken mmap().");
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/* Turn off the global flag so we don't try to do mapped symbol tables
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any more, which shuts up gdb unless the user specifically gives the
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"mapped" keyword again. */
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mapped_symbol_files = 0;
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}
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#endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
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/* If we don't support mapped symbol files, didn't ask for the file to be
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mapped, or failed to open the mapped file for some reason, then revert
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back to an unmapped objfile. */
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if (objfile == NULL)
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{
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objfile = (struct objfile *) xmalloc (sizeof (struct objfile));
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memset (objfile, 0, sizeof (struct objfile));
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objfile -> md = NULL;
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obstack_specify_allocation (&objfile -> psymbol_cache.cache, 0, 0,
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xmalloc, free);
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obstack_specify_allocation (&objfile -> psymbol_obstack, 0, 0, xmalloc,
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free);
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obstack_specify_allocation (&objfile -> symbol_obstack, 0, 0, xmalloc,
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free);
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obstack_specify_allocation (&objfile -> type_obstack, 0, 0, xmalloc,
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free);
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}
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/* Update the per-objfile information that comes from the bfd, ensuring
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that any data that is reference is saved in the per-objfile data
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region. */
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objfile -> obfd = abfd;
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if (objfile -> name != NULL)
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{
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mfree (objfile -> md, objfile -> name);
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}
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if (abfd != NULL)
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{
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objfile -> name = mstrsave (objfile -> md, bfd_get_filename (abfd));
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objfile -> mtime = bfd_get_mtime (abfd);
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/* Build section table. */
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if (build_objfile_section_table (objfile))
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{
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error ("Can't find the file sections in `%s': %s",
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objfile -> name, bfd_errmsg (bfd_get_error ()));
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}
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}
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/* Add this file onto the tail of the linked list of other such files. */
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objfile -> next = NULL;
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if (object_files == NULL)
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object_files = objfile;
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else
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{
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for (last_one = object_files;
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last_one -> next;
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last_one = last_one -> next);
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last_one -> next = objfile;
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}
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return (objfile);
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}
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/* Put OBJFILE at the front of the list. */
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void
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objfile_to_front (objfile)
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struct objfile *objfile;
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{
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struct objfile **objp;
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for (objp = &object_files; *objp != NULL; objp = &((*objp)->next))
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{
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if (*objp == objfile)
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{
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/* Unhook it from where it is. */
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*objp = objfile->next;
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/* Put it in the front. */
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objfile->next = object_files;
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object_files = objfile;
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break;
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}
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}
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}
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/* Unlink OBJFILE from the list of known objfiles, if it is found in the
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list.
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It is not a bug, or error, to call this function if OBJFILE is not known
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to be in the current list. This is done in the case of mapped objfiles,
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for example, just to ensure that the mapped objfile doesn't appear twice
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in the list. Since the list is threaded, linking in a mapped objfile
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twice would create a circular list.
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If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
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unlinking it, just to ensure that we have completely severed any linkages
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between the OBJFILE and the list. */
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void
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unlink_objfile (objfile)
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struct objfile *objfile;
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{
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struct objfile** objpp;
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for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp) -> next))
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{
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if (*objpp == objfile)
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{
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*objpp = (*objpp) -> next;
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objfile -> next = NULL;
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break;
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}
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}
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}
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/* Destroy an objfile and all the symtabs and psymtabs under it. Note
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that as much as possible is allocated on the symbol_obstack and
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psymbol_obstack, so that the memory can be efficiently freed.
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Things which we do NOT free because they are not in malloc'd memory
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or not in memory specific to the objfile include:
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objfile -> sf
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FIXME: If the objfile is using reusable symbol information (via mmalloc),
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then we need to take into account the fact that more than one process
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may be using the symbol information at the same time (when mmalloc is
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extended to support cooperative locking). When more than one process
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is using the mapped symbol info, we need to be more careful about when
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we free objects in the reusable area. */
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void
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free_objfile (objfile)
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struct objfile *objfile;
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{
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/* First do any symbol file specific actions required when we are
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finished with a particular symbol file. Note that if the objfile
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is using reusable symbol information (via mmalloc) then each of
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these routines is responsible for doing the correct thing, either
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freeing things which are valid only during this particular gdb
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execution, or leaving them to be reused during the next one. */
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if (objfile -> sf != NULL)
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{
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(*objfile -> sf -> sym_finish) (objfile);
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}
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/* We always close the bfd. */
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if (objfile -> obfd != NULL)
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{
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char *name = bfd_get_filename (objfile->obfd);
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if (!bfd_close (objfile -> obfd))
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warning ("cannot close \"%s\": %s",
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name, bfd_errmsg (bfd_get_error ()));
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free (name);
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}
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/* Remove it from the chain of all objfiles. */
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unlink_objfile (objfile);
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/* If we are going to free the runtime common objfile, mark it
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as unallocated. */
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if (objfile == rt_common_objfile)
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rt_common_objfile = NULL;
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/* Before the symbol table code was redone to make it easier to
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selectively load and remove information particular to a specific
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linkage unit, gdb used to do these things whenever the monolithic
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symbol table was blown away. How much still needs to be done
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is unknown, but we play it safe for now and keep each action until
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it is shown to be no longer needed. */
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#if defined (CLEAR_SOLIB)
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CLEAR_SOLIB ();
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/* CLEAR_SOLIB closes the bfd's for any shared libraries. But
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the to_sections for a core file might refer to those bfd's. So
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detach any core file. */
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{
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struct target_ops *t = find_core_target ();
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if (t != NULL)
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(t->to_detach) (NULL, 0);
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}
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#endif
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/* I *think* all our callers call clear_symtab_users. If so, no need
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to call this here. */
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clear_pc_function_cache ();
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/* The last thing we do is free the objfile struct itself for the
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non-reusable case, or detach from the mapped file for the reusable
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case. Note that the mmalloc_detach or the mfree is the last thing
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we can do with this objfile. */
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#if defined(USE_MMALLOC) && defined(HAVE_MMAP)
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if (objfile -> flags & OBJF_MAPPED)
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{
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/* Remember the fd so we can close it. We can't close it before
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doing the detach, and after the detach the objfile is gone. */
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int mmfd;
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mmfd = objfile -> mmfd;
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mmalloc_detach (objfile -> md);
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objfile = NULL;
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close (mmfd);
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}
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#endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
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/* If we still have an objfile, then either we don't support reusable
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objfiles or this one was not reusable. So free it normally. */
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if (objfile != NULL)
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{
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if (objfile -> name != NULL)
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{
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mfree (objfile -> md, objfile -> name);
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}
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if (objfile->global_psymbols.list)
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mfree (objfile->md, objfile->global_psymbols.list);
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if (objfile->static_psymbols.list)
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mfree (objfile->md, objfile->static_psymbols.list);
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/* Free the obstacks for non-reusable objfiles */
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obstack_free (&objfile -> psymbol_cache.cache, 0);
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obstack_free (&objfile -> psymbol_obstack, 0);
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obstack_free (&objfile -> symbol_obstack, 0);
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obstack_free (&objfile -> type_obstack, 0);
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mfree (objfile -> md, objfile);
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objfile = NULL;
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}
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}
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/* Free all the object files at once and clean up their users. */
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void
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free_all_objfiles ()
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{
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struct objfile *objfile, *temp;
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ALL_OBJFILES_SAFE (objfile, temp)
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{
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free_objfile (objfile);
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}
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clear_symtab_users ();
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}
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/* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
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entries in new_offsets. */
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void
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objfile_relocate (objfile, new_offsets)
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struct objfile *objfile;
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struct section_offsets *new_offsets;
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{
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struct section_offsets *delta = (struct section_offsets *)
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alloca (sizeof (struct section_offsets)
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+ objfile->num_sections * sizeof (delta->offsets));
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{
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int i;
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int something_changed = 0;
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for (i = 0; i < objfile->num_sections; ++i)
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{
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ANOFFSET (delta, i) =
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ANOFFSET (new_offsets, i) - ANOFFSET (objfile->section_offsets, i);
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if (ANOFFSET (delta, i) != 0)
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something_changed = 1;
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}
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if (!something_changed)
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return;
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}
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/* OK, get all the symtabs. */
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{
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struct symtab *s;
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ALL_OBJFILE_SYMTABS (objfile, s)
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{
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struct linetable *l;
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struct blockvector *bv;
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int i;
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/* First the line table. */
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l = LINETABLE (s);
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if (l)
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{
|
||
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_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;
|
||
}
|
||
|
||
/* 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 ((section == 0 || section == s->the_bfd_section) &&
|
||
s->addr <= pc && pc < s->endaddr)
|
||
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);
|
||
}
|