420 lines
14 KiB
C
420 lines
14 KiB
C
/*
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* Server-side file mapping management
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*
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* Copyright (C) 1999 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "config.h"
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#include "wine/port.h"
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#include <assert.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "windef.h"
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#include "winternl.h"
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#include "file.h"
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#include "handle.h"
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#include "thread.h"
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#include "request.h"
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struct mapping
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{
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struct object obj; /* object header */
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file_pos_t size; /* mapping size */
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int protect; /* protection flags */
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struct file *file; /* file mapped */
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int header_size; /* size of headers (for PE image mapping) */
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void *base; /* default base addr (for PE image mapping) */
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struct file *shared_file; /* temp file for shared PE mapping */
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int shared_size; /* shared mapping total size */
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struct list shared_entry; /* entry in global shared PE mappings list */
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};
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static void mapping_dump( struct object *obj, int verbose );
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static struct fd *mapping_get_fd( struct object *obj );
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static void mapping_destroy( struct object *obj );
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static const struct object_ops mapping_ops =
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{
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sizeof(struct mapping), /* size */
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mapping_dump, /* dump */
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no_add_queue, /* add_queue */
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NULL, /* remove_queue */
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NULL, /* signaled */
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NULL, /* satisfied */
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no_signal, /* signal */
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mapping_get_fd, /* get_fd */
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no_close_handle, /* close_handle */
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mapping_destroy /* destroy */
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};
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static struct list shared_list = LIST_INIT(shared_list);
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#ifdef __i386__
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/* These are always the same on an i386, and it will be faster this way */
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# define page_mask 0xfff
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# define page_shift 12
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# define init_page_size() do { /* nothing */ } while(0)
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#else /* __i386__ */
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static int page_shift, page_mask;
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static void init_page_size(void)
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{
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int page_size;
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# ifdef HAVE_GETPAGESIZE
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page_size = getpagesize();
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# else
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# ifdef __svr4__
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page_size = sysconf(_SC_PAGESIZE);
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# else
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# error Cannot get the page size on this platform
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# endif
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# endif
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page_mask = page_size - 1;
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/* Make sure we have a power of 2 */
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assert( !(page_size & page_mask) );
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page_shift = 0;
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while ((1 << page_shift) != page_size) page_shift++;
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}
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#endif /* __i386__ */
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#define ROUND_SIZE_MASK(addr,size,mask) \
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(((int)(size) + ((int)(addr) & (mask)) + (mask)) & ~(mask))
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#define ROUND_SIZE(size) (((size) + page_mask) & ~page_mask)
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/* find the shared PE mapping for a given mapping */
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static struct file *get_shared_file( struct mapping *mapping )
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{
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struct mapping *ptr;
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LIST_FOR_EACH_ENTRY( ptr, &shared_list, struct mapping, shared_entry )
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if (is_same_file( ptr->file, mapping->file ))
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return (struct file *)grab_object( ptr->shared_file );
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return NULL;
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}
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/* return the size of the memory mapping of a given section */
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static inline unsigned int get_section_map_size( const IMAGE_SECTION_HEADER *sec )
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{
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if (!sec->Misc.VirtualSize) return ROUND_SIZE( sec->SizeOfRawData );
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else return ROUND_SIZE( sec->Misc.VirtualSize );
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}
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/* return the size of the file mapping of a given section */
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static inline unsigned int get_section_filemap_size( const IMAGE_SECTION_HEADER *sec )
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{
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if (!sec->Misc.VirtualSize) return sec->SizeOfRawData;
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else return min( sec->SizeOfRawData, ROUND_SIZE( sec->Misc.VirtualSize ) );
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}
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/* allocate and fill the temp file for a shared PE image mapping */
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static int build_shared_mapping( struct mapping *mapping, int fd,
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IMAGE_SECTION_HEADER *sec, unsigned int nb_sec )
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{
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unsigned int i, size, max_size, total_size;
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off_t shared_pos, read_pos, write_pos;
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char *buffer = NULL;
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int shared_fd;
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long toread;
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/* compute the total size of the shared mapping */
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total_size = max_size = 0;
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for (i = 0; i < nb_sec; i++)
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{
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if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
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(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
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{
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size = get_section_filemap_size( &sec[i] );
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if (size > max_size) max_size = size;
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total_size += get_section_map_size( &sec[i] );
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}
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}
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if (!(mapping->shared_size = total_size)) return 1; /* nothing to do */
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if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
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/* create a temp file for the mapping */
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if (!(mapping->shared_file = create_temp_file( GENERIC_READ|GENERIC_WRITE ))) return 0;
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if (!grow_file( mapping->shared_file, total_size )) goto error;
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if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
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if (!(buffer = malloc( max_size ))) goto error;
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/* copy the shared sections data into the temp file */
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shared_pos = 0;
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for (i = 0; i < nb_sec; i++)
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{
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if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
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if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
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write_pos = shared_pos;
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shared_pos += get_section_map_size( &sec[i] );
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read_pos = sec[i].PointerToRawData;
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size = get_section_filemap_size( &sec[i] );
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if (!read_pos || !size) continue;
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toread = size;
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while (toread)
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{
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long res = pread( fd, buffer + sec[i].SizeOfRawData - toread, toread, read_pos );
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if (res <= 0) goto error;
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toread -= res;
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read_pos += res;
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}
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if (pwrite( shared_fd, buffer, size, write_pos ) != size) goto error;
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}
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free( buffer );
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return 1;
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error:
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release_object( mapping->shared_file );
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mapping->shared_file = NULL;
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if (buffer) free( buffer );
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return 0;
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}
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/* retrieve the mapping parameters for an executable (PE) image */
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static int get_image_params( struct mapping *mapping )
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{
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IMAGE_DOS_HEADER dos;
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IMAGE_NT_HEADERS nt;
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IMAGE_SECTION_HEADER *sec = NULL;
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struct fd *fd;
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off_t pos;
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int unix_fd, size, toread;
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/* load the headers */
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if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
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if ((unix_fd = get_unix_fd( fd )) == -1) goto error;
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if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
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if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
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pos = dos.e_lfanew;
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if (pread( unix_fd, &nt.Signature, sizeof(nt.Signature), pos ) != sizeof(nt.Signature))
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goto error;
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pos += sizeof(nt.Signature);
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if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
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if (pread( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader), pos ) != sizeof(nt.FileHeader))
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goto error;
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pos += sizeof(nt.FileHeader);
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/* zero out Optional header in the case it's not present or partial */
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memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
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toread = min( sizeof(nt.OptionalHeader), nt.FileHeader.SizeOfOptionalHeader );
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if (pread( unix_fd, &nt.OptionalHeader, toread, pos ) != toread) goto error;
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pos += nt.FileHeader.SizeOfOptionalHeader;
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/* load the section headers */
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size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
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if (!(sec = malloc( size ))) goto error;
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if (pread( unix_fd, sec, size, pos ) != size) goto error;
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if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
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if (mapping->shared_file) list_add_head( &shared_list, &mapping->shared_entry );
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mapping->size = ROUND_SIZE( nt.OptionalHeader.SizeOfImage );
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mapping->base = (void *)nt.OptionalHeader.ImageBase;
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mapping->header_size = ROUND_SIZE_MASK( mapping->base, nt.OptionalHeader.SizeOfHeaders,
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nt.OptionalHeader.SectionAlignment - 1 );
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mapping->protect = VPROT_IMAGE;
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/* sanity check */
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if (mapping->header_size > mapping->size) goto error;
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free( sec );
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release_object( fd );
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return 1;
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error:
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if (sec) free( sec );
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release_object( fd );
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set_error( STATUS_INVALID_FILE_FOR_SECTION );
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return 0;
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}
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/* get the size of the unix file associated with the mapping */
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inline static int get_file_size( struct file *file, file_pos_t *size )
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{
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struct stat st;
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int unix_fd = get_file_unix_fd( file );
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if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 0;
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*size = st.st_size;
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return 1;
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}
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static struct object *create_mapping( const struct unicode_str *name, unsigned int attr,
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file_pos_t size, int protect, obj_handle_t handle )
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{
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struct mapping *mapping;
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int access = 0;
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if (!page_mask) init_page_size();
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if (!(mapping = create_named_object( sync_namespace, &mapping_ops, name, attr )))
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return NULL;
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if (get_error() == STATUS_OBJECT_NAME_EXISTS)
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return &mapping->obj; /* Nothing else to do */
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mapping->header_size = 0;
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mapping->base = NULL;
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mapping->shared_file = NULL;
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mapping->shared_size = 0;
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if (protect & VPROT_READ) access |= GENERIC_READ;
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if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
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if (handle)
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{
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if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
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if (protect & VPROT_IMAGE)
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{
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if (!get_image_params( mapping )) goto error;
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return &mapping->obj;
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}
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if (!size)
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{
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if (!get_file_size( mapping->file, &size )) goto error;
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if (!size)
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{
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set_error( STATUS_FILE_INVALID );
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goto error;
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}
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}
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else
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{
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if (!grow_file( mapping->file, size )) goto error;
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}
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}
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else /* Anonymous mapping (no associated file) */
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{
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if (!size || (protect & VPROT_IMAGE))
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{
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set_error( STATUS_INVALID_PARAMETER );
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mapping->file = NULL;
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goto error;
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}
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if (!(mapping->file = create_temp_file( access ))) goto error;
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if (!grow_file( mapping->file, size )) goto error;
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}
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mapping->size = (size + page_mask) & ~((file_pos_t)page_mask);
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mapping->protect = protect;
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return &mapping->obj;
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error:
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release_object( mapping );
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return NULL;
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}
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static void mapping_dump( struct object *obj, int verbose )
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{
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struct mapping *mapping = (struct mapping *)obj;
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assert( obj->ops == &mapping_ops );
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fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
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"shared_file=%p shared_size=%08x ",
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(unsigned int)(mapping->size >> 32), (unsigned int)mapping->size,
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mapping->protect, mapping->file, mapping->header_size,
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mapping->base, mapping->shared_file, mapping->shared_size );
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dump_object_name( &mapping->obj );
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fputc( '\n', stderr );
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}
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static struct fd *mapping_get_fd( struct object *obj )
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{
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struct mapping *mapping = (struct mapping *)obj;
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return get_obj_fd( (struct object *)mapping->file );
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}
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static void mapping_destroy( struct object *obj )
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{
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struct mapping *mapping = (struct mapping *)obj;
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assert( obj->ops == &mapping_ops );
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if (mapping->file) release_object( mapping->file );
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if (mapping->shared_file)
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{
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release_object( mapping->shared_file );
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list_remove( &mapping->shared_entry );
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}
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}
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int get_page_size(void)
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{
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if (!page_mask) init_page_size();
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return page_mask + 1;
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}
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/* create a file mapping */
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DECL_HANDLER(create_mapping)
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{
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struct object *obj;
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struct unicode_str name;
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file_pos_t size = ((file_pos_t)req->size_high << 32) | req->size_low;
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reply->handle = 0;
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get_req_unicode_str( &name );
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if ((obj = create_mapping( &name, req->attributes, size, req->protect, req->file_handle )))
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{
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reply->handle = alloc_handle( current->process, obj, req->access,
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req->attributes & OBJ_INHERIT );
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release_object( obj );
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}
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}
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/* open a handle to a mapping */
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DECL_HANDLER(open_mapping)
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{
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struct unicode_str name;
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get_req_unicode_str( &name );
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reply->handle = open_object( sync_namespace, &name, &mapping_ops, req->access, req->attributes );
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}
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/* get a mapping information */
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DECL_HANDLER(get_mapping_info)
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{
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struct mapping *mapping;
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if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
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0, &mapping_ops )))
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{
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reply->size_high = (unsigned int)(mapping->size >> 32);
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reply->size_low = (unsigned int)mapping->size;
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reply->protect = mapping->protect;
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reply->header_size = mapping->header_size;
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reply->base = mapping->base;
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reply->shared_file = 0;
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reply->shared_size = mapping->shared_size;
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if (mapping->shared_file)
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reply->shared_file = alloc_handle( current->process, mapping->shared_file,
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GENERIC_READ|GENERIC_WRITE, 0 );
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release_object( mapping );
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}
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}
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