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authorKlee Dienes <kdienes@apple.com>2002-11-18 16:37:54 +0000
committerKlee Dienes <kdienes@apple.com>2002-11-18 16:37:54 +0000
commit93509525ce7ec98e549760eae1848ebf2fff0c9b (patch)
tree631684b5c008f47a5fd235020b6a2411decf239e /bfd/bfdwin.c
parenteb1284494b10dc685a3b2cf3bd622d605a37b003 (diff)
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2002-11-16 Klee Dienes <kdienes@apple.com>
* Makefile.am (BFD32_LIBS): Add bfdwin.lo, bfdio.lo. (BFD32_LIBS_CFILES): Add bfdwin.c, bfdio.c. (BFD_H_FILES): Add bfdwin.c, bfdio.c. (LIBBFD_H_FILES): Add bfdwin.c, bfdio.c. Add dependencies for bfdwin.c, bfdio.c. * bfd.c: Remove bfd_get_mtime, bfd_get_size. * libbfd.c: Remove real_read, bfd_bread, _bfd_window_internal, bfd_init_window, bfd_free_window, bfd_get_file_window, bfd_bwrite, bfd_tell, bfd_flush, bfd_stat, bfd_seek. * bfdio.c: New file. Contains real_read, bfd_bread, bfd_write, bfd_tell, bfd_flush, bfd_stat, bfd_seek, bfd_ge_mtime, bfd_get_size (moved from libbfd.c and bfd.c). * bfdwin.c New file. Contains _bfd_window_internal, bfd_init_window, bfd_free_window, bfd_get_file_window (moved from libbfd.c and bfd.c). * po/SRC-POTFILES.in: Regenerate. * po/bfd.pot: Regenerate. * libbfd.h: Regenerate. * bfd-in2.h: Regenerate. * aclocal.m4: Regenerate. * Makefile.in: Regenerate. * configure: Regenerate. 2002-11-16 Klee Dienes <kdienes@apple.com> * Makefile.am (DOCFILES): Add bfdwin.texi, bfdio.texi. (PROTOS): Add bfdio.p, bfdwin.p. (SRCDOC): Add bfdio.c, bfdwin.c. (SRCPROT): Add bfdio.c, bfdwin.c. (SRCIPROT): Add bfdio.c, bfdwin.c. (LIBBFD_H_DEP): Add bfdio.c, bfdwin.c. (BFD_H_DEP): Add bfdio.c, bfdwin.c. Add rules for bfdio.texi, bfdwin.text. * bfd.texinfo: Include bfdio.texi.
Diffstat (limited to 'bfd/bfdwin.c')
-rw-r--r--bfd/bfdwin.c255
1 files changed, 255 insertions, 0 deletions
diff --git a/bfd/bfdwin.c b/bfd/bfdwin.c
new file mode 100644
index 0000000..4965458
--- /dev/null
+++ b/bfd/bfdwin.c
@@ -0,0 +1,255 @@
+/* Support for memory-mapped windows into a BFD.
+ Copyright 1995, 1996, 2001, 2002 Free Software Foundation, Inc.
+ Written by Cygnus Support.
+
+This file is part of BFD, the Binary File Descriptor library.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#include "sysdep.h"
+
+#include "bfd.h"
+#include "libbfd.h"
+
+/* Currently, if USE_MMAP is undefined, none if the window stuff is
+ used. Okay, so it's mis-named. At least the command-line option
+ "--without-mmap" is more obvious than "--without-windows" or some
+ such. */
+
+#ifdef USE_MMAP
+
+#undef HAVE_MPROTECT /* code's not tested yet */
+
+#if HAVE_MMAP || HAVE_MPROTECT || HAVE_MADVISE
+#include <sys/mman.h>
+#endif
+
+#ifndef MAP_FILE
+#define MAP_FILE 0
+#endif
+
+static int debug_windows;
+
+/* The idea behind the next and refcount fields is that one mapped
+ region can suffice for multiple read-only windows or multiple
+ non-overlapping read-write windows. It's not implemented yet
+ though. */
+
+/*
+INTERNAL_DEFINITION
+
+.struct _bfd_window_internal {
+. struct _bfd_window_internal *next;
+. PTR data;
+. bfd_size_type size;
+. int refcount : 31; {* should be enough... *}
+. unsigned mapped : 1; {* 1 = mmap, 0 = malloc *}
+.};
+*/
+
+void
+bfd_init_window (windowp)
+ bfd_window *windowp;
+{
+ windowp->data = 0;
+ windowp->i = 0;
+ windowp->size = 0;
+}
+
+void
+bfd_free_window (windowp)
+ bfd_window *windowp;
+{
+ bfd_window_internal *i = windowp->i;
+ windowp->i = 0;
+ windowp->data = 0;
+ if (i == 0)
+ return;
+ i->refcount--;
+ if (debug_windows)
+ fprintf (stderr, "freeing window @%p<%p,%lx,%p>\n",
+ windowp, windowp->data, windowp->size, windowp->i);
+ if (i->refcount != 0)
+ return;
+
+ if (i->mapped)
+ {
+#ifdef HAVE_MMAP
+ munmap (i->data, i->size);
+ goto no_free;
+#else
+ abort ();
+#endif
+ }
+#ifdef HAVE_MPROTECT
+ mprotect (i->data, i->size, PROT_READ | PROT_WRITE);
+#endif
+ free (i->data);
+#ifdef HAVE_MMAP
+ no_free:
+#endif
+ i->data = 0;
+ /* There should be no more references to i at this point. */
+ free (i);
+}
+
+static int ok_to_map = 1;
+
+boolean
+bfd_get_file_window (abfd, offset, size, windowp, writable)
+ bfd *abfd;
+ file_ptr offset;
+ bfd_size_type size;
+ bfd_window *windowp;
+ boolean writable;
+{
+ static size_t pagesize;
+ bfd_window_internal *i = windowp->i;
+ bfd_size_type size_to_alloc = size;
+
+ if (debug_windows)
+ fprintf (stderr, "bfd_get_file_window (%p, %6ld, %6ld, %p<%p,%lx,%p>, %d)",
+ abfd, (long) offset, (long) size,
+ windowp, windowp->data, (unsigned long) windowp->size,
+ windowp->i, writable);
+
+ /* Make sure we know the page size, so we can be friendly to mmap. */
+ if (pagesize == 0)
+ pagesize = getpagesize ();
+ if (pagesize == 0)
+ abort ();
+
+ if (i == 0)
+ {
+ i = ((bfd_window_internal *)
+ bfd_zmalloc ((bfd_size_type) sizeof (bfd_window_internal)));
+ windowp->i = i;
+ if (i == 0)
+ return false;
+ i->data = 0;
+ }
+#ifdef HAVE_MMAP
+ if (ok_to_map
+ && (i->data == 0 || i->mapped == 1)
+ && (abfd->flags & BFD_IN_MEMORY) == 0)
+ {
+ file_ptr file_offset, offset2;
+ size_t real_size;
+ int fd;
+ FILE *f;
+
+ /* Find the real file and the real offset into it. */
+ while (abfd->my_archive != NULL)
+ {
+ offset += abfd->origin;
+ abfd = abfd->my_archive;
+ }
+ f = bfd_cache_lookup (abfd);
+ fd = fileno (f);
+
+ /* Compute offsets and size for mmap and for the user's data. */
+ offset2 = offset % pagesize;
+ if (offset2 < 0)
+ abort ();
+ file_offset = offset - offset2;
+ real_size = offset + size - file_offset;
+ real_size = real_size + pagesize - 1;
+ real_size -= real_size % pagesize;
+
+ /* If we're re-using a memory region, make sure it's big enough. */
+ if (i->data && i->size < size)
+ {
+ munmap (i->data, i->size);
+ i->data = 0;
+ }
+ i->data = mmap (i->data, real_size,
+ writable ? PROT_WRITE | PROT_READ : PROT_READ,
+ (writable
+ ? MAP_FILE | MAP_PRIVATE
+ : MAP_FILE | MAP_SHARED),
+ fd, file_offset);
+ if (i->data == (PTR) -1)
+ {
+ /* An error happened. Report it, or try using malloc, or
+ something. */
+ bfd_set_error (bfd_error_system_call);
+ i->data = 0;
+ windowp->data = 0;
+ if (debug_windows)
+ fprintf (stderr, "\t\tmmap failed!\n");
+ return false;
+ }
+ if (debug_windows)
+ fprintf (stderr, "\n\tmapped %ld at %p, offset is %ld\n",
+ (long) real_size, i->data, (long) offset2);
+ i->size = real_size;
+ windowp->data = (PTR) ((bfd_byte *) i->data + offset2);
+ windowp->size = size;
+ i->mapped = 1;
+ return true;
+ }
+ else if (debug_windows)
+ {
+ if (ok_to_map)
+ fprintf (stderr, _("not mapping: data=%lx mapped=%d\n"),
+ (unsigned long) i->data, (int) i->mapped);
+ else
+ fprintf (stderr, _("not mapping: env var not set\n"));
+ }
+#else
+ ok_to_map = 0;
+#endif
+
+#ifdef HAVE_MPROTECT
+ if (!writable)
+ {
+ size_to_alloc += pagesize - 1;
+ size_to_alloc -= size_to_alloc % pagesize;
+ }
+#endif
+ if (debug_windows)
+ fprintf (stderr, "\n\t%s(%6ld)",
+ i->data ? "realloc" : " malloc", (long) size_to_alloc);
+ i->data = (PTR) bfd_realloc (i->data, size_to_alloc);
+ if (debug_windows)
+ fprintf (stderr, "\t-> %p\n", i->data);
+ i->refcount = 1;
+ if (i->data == NULL)
+ {
+ if (size_to_alloc == 0)
+ return true;
+ return false;
+ }
+ if (bfd_seek (abfd, offset, SEEK_SET) != 0)
+ return false;
+ i->size = bfd_bread (i->data, size, abfd);
+ if (i->size != size)
+ return false;
+ i->mapped = 0;
+#ifdef HAVE_MPROTECT
+ if (!writable)
+ {
+ if (debug_windows)
+ fprintf (stderr, "\tmprotect (%p, %ld, PROT_READ)\n", i->data,
+ (long) i->size);
+ mprotect (i->data, i->size, PROT_READ);
+ }
+#endif
+ windowp->data = i->data;
+ windowp->size = i->size;
+ return true;
+}
+
+#endif /* USE_MMAP */