diff options
Diffstat (limited to 'binutils-2.24/bfd/bfdwin.c')
-rw-r--r-- | binutils-2.24/bfd/bfdwin.c | 264 |
1 files changed, 0 insertions, 264 deletions
diff --git a/binutils-2.24/bfd/bfdwin.c b/binutils-2.24/bfd/bfdwin.c deleted file mode 100644 index 4103e9c2..00000000 --- a/binutils-2.24/bfd/bfdwin.c +++ /dev/null @@ -1,264 +0,0 @@ -/* Support for memory-mapped windows into a BFD. - Copyright 1995, 1996, 2001, 2002, 2003, 2005, 2007, 2008, 2009, 2011 - 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 3 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., 51 Franklin Street - Fifth Floor, Boston, - MA 02110-1301, USA. */ - -#include "sysdep.h" - -#include "bfd.h" -#include "libbfd.h" - -/* Currently, if USE_MMAP is undefined, none of the window stuff is - used. Enabled by --with-mmap. */ - -#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; -. void *data; -. bfd_size_type size; -. int refcount : 31; {* should be enough... *} -. unsigned mapped : 1; {* 1 = mmap, 0 = malloc *} -.}; -*/ - -void -bfd_init_window (bfd_window *windowp) -{ - windowp->data = 0; - windowp->i = 0; - windowp->size = 0; -} - -void -bfd_free_window (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, (unsigned long) 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; - -bfd_boolean -bfd_get_file_window (bfd *abfd, - file_ptr offset, - bfd_size_type size, - bfd_window *windowp, - bfd_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 == NULL) - { - i = bfd_zmalloc (sizeof (bfd_window_internal)); - if (i == NULL) - return FALSE; - i->data = NULL; - } -#ifdef HAVE_MMAP - if (ok_to_map - && (i->data == NULL || i->mapped == 1) - && (abfd->flags & BFD_IN_MEMORY) == 0) - { - file_ptr file_offset, offset2; - size_t real_size; - int fd; - - /* Find the real file and the real offset into it. */ - while (abfd->my_archive != NULL) - { - offset += abfd->origin; - abfd = abfd->my_archive; - } - - /* Seek into the file, to ensure it is open if cacheable. */ - if (abfd->iostream == NULL - && (abfd->iovec == NULL - || abfd->iovec->bseek (abfd, offset, SEEK_SET) != 0)) - goto free_and_fail; - - fd = fileno ((FILE *) abfd->iostream); - /* 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 != NULL && i->size < size) - { - munmap (i->data, i->size); - i->data = NULL; - } - 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 == (void *) -1) - { - /* An error happened. Report it, or try using malloc, or - something. */ - bfd_set_error (bfd_error_system_call); - windowp->data = 0; - if (debug_windows) - fprintf (stderr, "\t\tmmap failed!\n"); - goto free_and_fail; - } - 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 = (bfd_byte *) i->data + offset2; - windowp->size = size; - i->mapped = 1; - i->refcount = 1; - windowp->i = i; - 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 = bfd_realloc_or_free (i->data, size_to_alloc); - if (debug_windows) - fprintf (stderr, "\t-> %p\n", i->data); - if (i->data == NULL) - { - if (size_to_alloc == 0) - { - windowp->i = i; - return TRUE; - } - goto free_and_fail; - } - i->refcount = 1; - if (bfd_seek (abfd, offset, SEEK_SET) != 0) - goto free_and_fail; - i->size = bfd_bread (i->data, size, abfd); - if (i->size != size) - goto free_and_fail; - 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; - windowp->i = i; - return TRUE; - - free_and_fail: - /* We have a bfd_window_internal, but an error occurred. Free it. */ - free (i); - return FALSE; -} - -#endif /* USE_MMAP */ |