/* BFD library -- caching of file descriptors.
Copyright 1990, 1991, 1992, 1993, 1994, 1996, 2000, 2001, 2002,
- 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
+ 2003, 2004, 2005, 2007, 2008, 2009 Free Software Foundation, Inc.
Hacked by Steve Chamberlain of Cygnus Support (steve@cygnus.com).
#include "libbfd.h"
#include "libiberty.h"
+#ifdef HAVE_MMAP
+#include <sys/mman.h>
+#endif
+
/* In some cases we can optimize cache operation when reopening files.
For instance, a flush is entirely unnecessary if the file is already
closed, so a flush would use CACHE_NO_OPEN. Similarly, a seek using
kill->where = real_ftell ((FILE *) kill->iostream);
- /* Save the file st_mtime. This is a hack so that gdb can detect when
- an executable has been deleted and recreated. The only thing that
- makes this reasonable is that st_mtime doesn't change when a file
- is unlinked, so saving st_mtime makes BFD's file cache operation
- a little more transparent for this particular usage pattern. If we
- hadn't closed the file then we would not have lost the original
- contents, st_mtime etc. Of course, if something is writing to an
- existing file, then this is the wrong thing to do.
- FIXME: gdb should save these times itself on first opening a file,
- and this hack be removed. */
- if (kill->direction == no_direction || kill->direction == read_direction)
- {
- bfd_get_mtime (kill);
- kill->mtime_set = TRUE;
- }
-
return bfd_cache_delete (kill);
}
static int
cache_bseek (struct bfd *abfd, file_ptr offset, int whence)
{
- FILE *f = bfd_cache_lookup (abfd, whence != SEEK_CUR ? CACHE_NO_SEEK : 0);
+ FILE *f = bfd_cache_lookup (abfd, whence != SEEK_CUR ? CACHE_NO_SEEK : CACHE_NORMAL);
if (f == NULL)
return -1;
return real_fseek (f, offset, whence);
first octet in the file, NOT the beginning of the archive header. */
static file_ptr
-cache_bread (struct bfd *abfd, void *buf, file_ptr nbytes)
+cache_bread_1 (struct bfd *abfd, void *buf, file_ptr nbytes)
{
FILE *f;
file_ptr nread;
if (nbytes == 0)
return 0;
- f = bfd_cache_lookup (abfd, 0);
+ f = bfd_cache_lookup (abfd, CACHE_NORMAL);
if (f == NULL)
return 0;
return -1;
}
#endif
+ if (nread < nbytes)
+ /* This may or may not be an error, but in case the calling code
+ bails out because of it, set the right error code. */
+ bfd_set_error (bfd_error_file_truncated);
+ return nread;
+}
+
+static file_ptr
+cache_bread (struct bfd *abfd, void *buf, file_ptr nbytes)
+{
+ file_ptr nread = 0;
+
+ /* Some filesystems are unable to handle reads that are too large
+ (for instance, NetApp shares with oplocks turned off). To avoid
+ hitting this limitation, we read the buffer in chunks of 8MB max. */
+ while (nread < nbytes)
+ {
+ const file_ptr max_chunk_size = 0x800000;
+ file_ptr chunk_size = nbytes - nread;
+ file_ptr chunk_nread;
+
+ if (chunk_size > max_chunk_size)
+ chunk_size = max_chunk_size;
+
+ chunk_nread = cache_bread_1 (abfd, (char *) buf + nread, chunk_size);
+
+ /* Update the nread count.
+
+ We just have to be careful of the case when cache_bread_1 returns
+ a negative count: If this is our first read, then set nread to
+ that negative count in order to return that negative value to the
+ caller. Otherwise, don't add it to our total count, or we would
+ end up returning a smaller number of bytes read than we actually
+ did. */
+ if (nread == 0 || chunk_nread > 0)
+ nread += chunk_nread;
+
+ if (chunk_nread < chunk_size)
+ break;
+ }
+
return nread;
}
cache_bwrite (struct bfd *abfd, const void *where, file_ptr nbytes)
{
file_ptr nwrite;
- FILE *f = bfd_cache_lookup (abfd, 0);
+ FILE *f = bfd_cache_lookup (abfd, CACHE_NORMAL);
+
if (f == NULL)
return 0;
nwrite = fwrite (where, 1, nbytes, f);
{
int sts;
FILE *f = bfd_cache_lookup (abfd, CACHE_NO_OPEN);
+
if (f == NULL)
return 0;
sts = fflush (f);
{
int sts;
FILE *f = bfd_cache_lookup (abfd, CACHE_NO_SEEK_ERROR);
+
if (f == NULL)
return -1;
sts = fstat (fileno (f), sb);
return sts;
}
-static const struct bfd_iovec cache_iovec = {
+static void *
+cache_bmmap (struct bfd *abfd ATTRIBUTE_UNUSED,
+ void *addr ATTRIBUTE_UNUSED,
+ bfd_size_type len ATTRIBUTE_UNUSED,
+ int prot ATTRIBUTE_UNUSED,
+ int flags ATTRIBUTE_UNUSED,
+ file_ptr offset ATTRIBUTE_UNUSED)
+{
+ void *ret = (void *) -1;
+
+ if ((abfd->flags & BFD_IN_MEMORY) != 0)
+ abort ();
+#ifdef HAVE_MMAP
+ else
+ {
+ FILE *f = bfd_cache_lookup (abfd, CACHE_NO_SEEK_ERROR);
+ if (f == NULL)
+ return ret;
+
+ ret = mmap (addr, len, prot, flags, fileno (f), offset);
+ if (ret == (void *) -1)
+ bfd_set_error (bfd_error_system_call);
+ }
+#endif
+
+ return ret;
+}
+
+static const struct bfd_iovec cache_iovec =
+{
&cache_bread, &cache_bwrite, &cache_btell, &cache_bseek,
- &cache_bclose, &cache_bflush, &cache_bstat
+ &cache_bclose, &cache_bflush, &cache_bstat, &cache_bmmap
};
/*
projects / msp430-binutils.git / blobdiff