328 lines
11 KiB
C
328 lines
11 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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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "config.h"
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#include "winnt.h"
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#include "winbase.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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int size_high; /* mapping size */
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int size_low; /* 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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};
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static void mapping_dump( struct object *obj, int verbose );
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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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NULL, /* get_poll_events */
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NULL, /* poll_event */
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no_read_fd, /* get_read_fd */
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no_write_fd, /* get_write_fd */
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no_flush, /* flush */
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no_get_file_info, /* get_file_info */
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mapping_destroy /* destroy */
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};
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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() /* nothing */
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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_ADDR(addr) \
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((int)(addr) & ~page_mask)
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#define ROUND_SIZE(addr,size) \
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(((int)(size) + ((int)(addr) & page_mask) + page_mask) & ~page_mask)
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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, int nb_sec )
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{
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int i, max_size, total_size, pos;
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char *buffer = NULL;
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int shared_fd = -1;
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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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int size = ROUND_SIZE( 0, sec[i].Misc.VirtualSize );
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if (size > max_size) max_size = size;
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total_size += size;
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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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/* create a temp file for the mapping */
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if (!(mapping->shared_file = create_temp_file( GENERIC_READ|GENERIC_WRITE ))) goto error;
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if (!grow_file( mapping->shared_file, 0, total_size )) goto error;
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if ((shared_fd = file_get_mmap_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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for (i = pos = 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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if (lseek( shared_fd, pos, SEEK_SET ) != pos) goto error;
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pos += ROUND_SIZE( 0, sec[i].Misc.VirtualSize );
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if (sec->Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA) continue;
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if (!sec->PointerToRawData || !sec->SizeOfRawData) continue;
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if (lseek( fd, sec[i].PointerToRawData, SEEK_SET ) != sec[i].PointerToRawData) goto error;
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if (read( fd, buffer, sec[i].SizeOfRawData ) != sec[i].SizeOfRawData) goto error;
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if (write( shared_fd, buffer, sec[i].SizeOfRawData ) != sec[i].SizeOfRawData) goto error;
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}
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close( shared_fd );
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free( buffer );
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return 1;
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error:
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if (shared_fd != -1) close( shared_fd );
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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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int fd, filepos, size;
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/* load the headers */
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if ((fd = file_get_mmap_fd( mapping->file )) == -1) return 0;
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filepos = lseek( fd, 0, SEEK_SET );
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if (read( fd, &dos, sizeof(dos) ) != sizeof(dos)) goto error;
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if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
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if (lseek( fd, dos.e_lfanew, SEEK_SET ) == -1) goto error;
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if (read( fd, &nt, sizeof(nt) ) != sizeof(nt)) goto error;
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if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
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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 (read( fd, sec, size ) != size) goto error;
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if (!build_shared_mapping( mapping, fd, sec, nt.FileHeader.NumberOfSections )) goto error;
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mapping->size_low = ROUND_SIZE( 0, nt.OptionalHeader.SizeOfImage );
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mapping->size_high = 0;
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mapping->base = (void *)nt.OptionalHeader.ImageBase;
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mapping->header_size = ROUND_SIZE( mapping->base, nt.OptionalHeader.SizeOfHeaders );
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mapping->protect = VPROT_IMAGE;
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/* sanity check */
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if (mapping->header_size > mapping->size_low) goto error;
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lseek( fd, filepos, SEEK_SET );
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close( fd );
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free( sec );
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return 1;
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error:
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lseek( fd, filepos, SEEK_SET );
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close( fd );
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if (sec) free( sec );
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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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static struct object *create_mapping( int size_high, int size_low, int protect,
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int handle, const WCHAR *name, size_t len )
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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( &mapping_ops, name, len )))
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return NULL;
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if (get_error() == STATUS_OBJECT_NAME_COLLISION)
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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 != -1)
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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_high && !size_low)
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{
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struct get_file_info_request req;
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struct object *obj = (struct object *)mapping->file;
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obj->ops->get_file_info( obj, &req );
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size_high = req.size_high;
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size_low = ROUND_SIZE( 0, req.size_low );
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}
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else if (!grow_file( mapping->file, size_high, size_low )) goto error;
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}
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else /* Anonymous mapping (no associated file) */
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{
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if ((!size_high && !size_low) || (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_high, size_low )) goto error;
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}
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mapping->size_high = size_high;
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mapping->size_low = ROUND_SIZE( 0, size_low );
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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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mapping->size_high, mapping->size_low, mapping->protect, mapping->file,
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mapping->header_size, 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 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) release_object( mapping->shared_file );
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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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req->handle = -1;
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if ((obj = create_mapping( req->size_high, req->size_low,
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req->protect, req->file_handle,
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get_req_data(req), get_req_data_size(req) )))
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{
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int access = FILE_MAP_ALL_ACCESS;
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if (!(req->protect & VPROT_WRITE)) access &= ~FILE_MAP_WRITE;
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req->handle = alloc_handle( current->process, obj, access, req->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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req->handle = open_object( get_req_data(req), get_req_data_size(req),
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&mapping_ops, req->access, req->inherit );
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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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req->size_high = mapping->size_high;
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req->size_low = mapping->size_low;
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req->protect = mapping->protect;
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req->header_size = mapping->header_size;
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req->base = mapping->base;
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req->shared_file = -1;
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req->shared_size = mapping->shared_size;
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if (mapping->shared_file)
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req->shared_file = alloc_handle( current->process, mapping->shared_file,
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GENERIC_READ|GENERIC_WRITE, 0 );
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if (mapping->file) set_reply_fd( current, file_get_mmap_fd( mapping->file ) );
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release_object( mapping );
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}
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}
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