- if (ptr == NULL)
- bfd_set_error (bfd_error_no_memory);
- else
- memset (ptr, 0, size);
- }
-
- return ptr;
-}
-\f
-/* Some IO code */
-
-
-/* Note that archive entries don't have streams; they share their parent's.
- This allows someone to play with the iostream behind BFD's back.
-
- Also, note that the origin pointer points to the beginning of a file's
- contents (0 for non-archive elements). For archive entries this is the
- first octet in the file, NOT the beginning of the archive header. */
-
-static int
-real_read (where, a,b, file)
- PTR where;
- size_t a;
- size_t b;
- FILE *file;
-{
- /* FIXME - this looks like an optimization, but it's really to cover
- up for a feature of some OSs (not solaris - sigh) that
- ld/pe-dll.c takes advantage of (apparently) when it creates BFDs
- internally and tries to link against them. BFD seems to be smart
- enough to realize there are no symbol records in the "file" that
- doesn't exist but attempts to read them anyway. On Solaris,
- attempting to read zero bytes from a NULL file results in a core
- dump, but on other platforms it just returns zero bytes read.
- This makes it to something reasonable. - DJ */
- if (a == 0 || b == 0)
- return 0;
-
-#if defined (__VAX) && defined (VMS)
- /* Apparently fread on Vax VMS does not keep the record length
- information. */
- return read (fileno (file), where, a * b);
-#else
- return fread (where, a, b, file);
-#endif
-}
-
-/* Return value is amount read (FIXME: how are errors and end of file dealt
- with? We never call bfd_set_error, which is probably a mistake). */
-
-bfd_size_type
-bfd_read (ptr, size, nitems, abfd)
- PTR ptr;
- bfd_size_type size;
- bfd_size_type nitems;
- bfd *abfd;
-{
- int nread;
-
- if ((abfd->flags & BFD_IN_MEMORY) != 0)
- {
- struct bfd_in_memory *bim;
- bfd_size_type get;
-
- bim = (struct bfd_in_memory *) abfd->iostream;
- get = size * nitems;
- if (abfd->where + get > bim->size)
- {
- if (bim->size < (bfd_size_type) abfd->where)
- get = 0;
- else
- get = bim->size - abfd->where;
- bfd_set_error (bfd_error_file_truncated);
- }
- memcpy (ptr, bim->buffer + abfd->where, get);
- abfd->where += get;
- return get;
- }
-
- nread = real_read (ptr, 1, (size_t)(size*nitems), bfd_cache_lookup(abfd));
- if (nread > 0)
- abfd->where += nread;
-
- /* Set bfd_error if we did not read as much data as we expected.
-
- If the read failed due to an error set the bfd_error_system_call,
- else set bfd_error_file_truncated.
-
- A BFD backend may wish to override bfd_error_file_truncated to
- provide something more useful (eg. no_symbols or wrong_format). */
- if (nread != (int) (size * nitems))
- {
- if (ferror (bfd_cache_lookup (abfd)))
- bfd_set_error (bfd_error_system_call);
- else
- bfd_set_error (bfd_error_file_truncated);
- }
-
- return nread;
-}
-
-/* The window support stuff should probably be broken out into
- another file.... */
-/* 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. */
-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;
-}
-\f
-/* 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;
-
-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;
- size_t 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)
- {
- windowp->i = i = (bfd_window_internal *) bfd_zmalloc (sizeof (bfd_window_internal));
- 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;