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[/] [openrisc/] [trunk/] [gnu-src/] [binutils-2.18.50/] [bfd/] [bfdwin.c] - Blame information for rev 179

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1 38 julius
/* Support for memory-mapped windows into a BFD.
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   Copyright 1995, 1996, 2001, 2002, 2003, 2005, 2007, 2008
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   Free Software Foundation, Inc.
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   Written by Cygnus Support.
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   This file is part of BFD, the Binary File Descriptor library.
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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 3 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., 51 Franklin Street - Fifth Floor, Boston,
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   MA 02110-1301, USA.  */
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#include "sysdep.h"
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#include "bfd.h"
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#include "libbfd.h"
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/* Currently, if USE_MMAP is undefined, none if the window stuff is
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   used.  Okay, so it's mis-named.  At least the command-line option
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   "--without-mmap" is more obvious than "--without-windows" or some
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   such.  */
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#ifdef USE_MMAP
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#undef HAVE_MPROTECT /* code's not tested yet */
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#if HAVE_MMAP || HAVE_MPROTECT || HAVE_MADVISE
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#include <sys/mman.h>
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#endif
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#ifndef MAP_FILE
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#define MAP_FILE 0
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#endif
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static int debug_windows;
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/* The idea behind the next and refcount fields is that one mapped
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   region can suffice for multiple read-only windows or multiple
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   non-overlapping read-write windows.  It's not implemented yet
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   though.  */
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/*
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INTERNAL_DEFINITION
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.struct _bfd_window_internal {
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.  struct _bfd_window_internal *next;
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.  void *data;
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.  bfd_size_type size;
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.  int refcount : 31;           {* should be enough...  *}
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.  unsigned mapped : 1;         {* 1 = mmap, 0 = malloc *}
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.};
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*/
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void
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bfd_init_window (bfd_window *windowp)
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{
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  windowp->data = 0;
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  windowp->i = 0;
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  windowp->size = 0;
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}
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void
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bfd_free_window (bfd_window *windowp)
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{
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  bfd_window_internal *i = windowp->i;
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  windowp->i = 0;
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  windowp->data = 0;
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  if (i == 0)
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    return;
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  i->refcount--;
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  if (debug_windows)
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    fprintf (stderr, "freeing window @%p<%p,%lx,%p>\n",
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             windowp, windowp->data, windowp->size, windowp->i);
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  if (i->refcount != 0)
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    return;
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  if (i->mapped)
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    {
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#ifdef HAVE_MMAP
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      munmap (i->data, i->size);
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      goto no_free;
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#else
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      abort ();
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#endif
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    }
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#ifdef HAVE_MPROTECT
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  mprotect (i->data, i->size, PROT_READ | PROT_WRITE);
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#endif
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  free (i->data);
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#ifdef HAVE_MMAP
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 no_free:
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#endif
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  i->data = 0;
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  /* There should be no more references to i at this point.  */
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  free (i);
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}
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static int ok_to_map = 1;
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bfd_boolean
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bfd_get_file_window (bfd *abfd,
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                     file_ptr offset,
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                     bfd_size_type size,
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                     bfd_window *windowp,
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                     bfd_boolean writable)
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{
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  static size_t pagesize;
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  bfd_window_internal *i = windowp->i;
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  bfd_size_type size_to_alloc = size;
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  if (debug_windows)
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    fprintf (stderr, "bfd_get_file_window (%p, %6ld, %6ld, %p<%p,%lx,%p>, %d)",
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             abfd, (long) offset, (long) size,
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             windowp, windowp->data, (unsigned long) windowp->size,
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             windowp->i, writable);
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  /* Make sure we know the page size, so we can be friendly to mmap.  */
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  if (pagesize == 0)
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    pagesize = getpagesize ();
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  if (pagesize == 0)
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    abort ();
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  if (i == 0)
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    {
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      i = bfd_zmalloc (sizeof (bfd_window_internal));
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      windowp->i = i;
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      if (i == 0)
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        return FALSE;
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      i->data = 0;
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    }
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#ifdef HAVE_MMAP
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  if (ok_to_map
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      && (i->data == 0 || i->mapped == 1)
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      && (abfd->flags & BFD_IN_MEMORY) == 0)
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    {
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      file_ptr file_offset, offset2;
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      size_t real_size;
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      int fd;
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      /* Find the real file and the real offset into it.  */
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      while (abfd->my_archive != NULL)
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        {
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          offset += abfd->origin;
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          abfd = abfd->my_archive;
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        }
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      /* Seek into the file, to ensure it is open if cacheable.  */
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      if (abfd->iostream == NULL
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          && (abfd->iovec == NULL
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              || abfd->iovec->bseek (abfd, offset, SEEK_SET) != 0))
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        return FALSE;
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      fd = fileno ((FILE *) abfd->iostream);
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      /* Compute offsets and size for mmap and for the user's data.  */
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      offset2 = offset % pagesize;
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      if (offset2 < 0)
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        abort ();
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      file_offset = offset - offset2;
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      real_size = offset + size - file_offset;
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      real_size = real_size + pagesize - 1;
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      real_size -= real_size % pagesize;
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      /* If we're re-using a memory region, make sure it's big enough.  */
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      if (i->data && i->size < size)
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        {
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          munmap (i->data, i->size);
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          i->data = 0;
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        }
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      i->data = mmap (i->data, real_size,
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                      writable ? PROT_WRITE | PROT_READ : PROT_READ,
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                      (writable
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                       ? MAP_FILE | MAP_PRIVATE
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                       : MAP_FILE | MAP_SHARED),
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                      fd, file_offset);
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      if (i->data == (void *) -1)
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        {
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          /* An error happened.  Report it, or try using malloc, or
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             something.  */
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          bfd_set_error (bfd_error_system_call);
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          i->data = 0;
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          windowp->data = 0;
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          if (debug_windows)
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            fprintf (stderr, "\t\tmmap failed!\n");
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          return FALSE;
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        }
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      if (debug_windows)
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        fprintf (stderr, "\n\tmapped %ld at %p, offset is %ld\n",
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                 (long) real_size, i->data, (long) offset2);
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      i->size = real_size;
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      windowp->data = (bfd_byte *) i->data + offset2;
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      windowp->size = size;
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      i->mapped = 1;
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      return TRUE;
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    }
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  else if (debug_windows)
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    {
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      if (ok_to_map)
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        fprintf (stderr, _("not mapping: data=%lx mapped=%d\n"),
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                 (unsigned long) i->data, (int) i->mapped);
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      else
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        fprintf (stderr, _("not mapping: env var not set\n"));
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    }
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#else
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  ok_to_map = 0;
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#endif
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#ifdef HAVE_MPROTECT
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  if (!writable)
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    {
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      size_to_alloc += pagesize - 1;
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      size_to_alloc -= size_to_alloc % pagesize;
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    }
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#endif
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  if (debug_windows)
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    fprintf (stderr, "\n\t%s(%6ld)",
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             i->data ? "realloc" : " malloc", (long) size_to_alloc);
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  i->data = bfd_realloc_or_free (i->data, size_to_alloc);
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  if (debug_windows)
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    fprintf (stderr, "\t-> %p\n", i->data);
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  if (i->data == NULL)
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    {
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      if (size_to_alloc == 0)
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        return TRUE;
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      return FALSE;
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    }
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  i->refcount = 1;
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  if (bfd_seek (abfd, offset, SEEK_SET) != 0)
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    return FALSE;
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  i->size = bfd_bread (i->data, size, abfd);
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  if (i->size != size)
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    return FALSE;
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  i->mapped = 0;
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#ifdef HAVE_MPROTECT
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  if (!writable)
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    {
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      if (debug_windows)
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        fprintf (stderr, "\tmprotect (%p, %ld, PROT_READ)\n", i->data,
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                 (long) i->size);
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      mprotect (i->data, i->size, PROT_READ);
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    }
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#endif
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  windowp->data = i->data;
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  windowp->size = i->size;
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  return TRUE;
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}
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#endif /* USE_MMAP */

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