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801 lines
24 KiB
801 lines
24 KiB
/*++
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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ldrreloc.c
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Abstract:
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This module contains the code to relocate an image when
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the preferred base isn't available. This is called by the
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boot loader, device driver loader, and system loader.
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Author:
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Mike O'Leary (mikeol) 03-Feb-1992
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Revision History:
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--*/
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#include "ntrtlp.h"
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#if 0 // These are not actually used.
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// See also ntrtl.h, RtlUshortByteSwap, RtlUlongByteSwap, RtlUlonglongByteSwap.
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//
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// byte swapping macros (LE/BE) used for IA64 relocations
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// source != destination
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//
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//#define SWAP_SHORT(_dst,_src) \
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// ((((unsigned char *)_dst)[1] = ((unsigned char *)_src)[0]), \
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// (((unsigned char *)_dst)[0] = ((unsigned char *)_src)[1]))
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//#define SWAP_INT(_dst,_src) \
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// ((((unsigned char *)_dst)[3] = ((unsigned char *)_src)[0]), \
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// (((unsigned char *)_dst)[2] = ((unsigned char *)_src)[1]), \
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// (((unsigned char *)_dst)[1] = ((unsigned char *)_src)[2]), \
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// (((unsigned char *)_dst)[0] = ((unsigned char *)_src)[3]))
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//#define SWAP_LONG_LONG(_dst,_src) \
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// ((((unsigned char *)_dst)[7] = ((unsigned char *)_src)[0]), \
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// (((unsigned char *)_dst)[6] = ((unsigned char *)_src)[1]), \
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// (((unsigned char *)_dst)[5] = ((unsigned char *)_src)[2]), \
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// (((unsigned char *)_dst)[4] = ((unsigned char *)_src)[3]), \
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// (((unsigned char *)_dst)[3] = ((unsigned char *)_src)[4]), \
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// (((unsigned char *)_dst)[2] = ((unsigned char *)_src)[5]), \
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// (((unsigned char *)_dst)[1] = ((unsigned char *)_src)[6]), \
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// (((unsigned char *)_dst)[0] = ((unsigned char *)_src)[7]))
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#endif
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//
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// Mark a HIGHADJ entry as needing an increment if reprocessing.
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//
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#define LDRP_RELOCATION_INCREMENT 0x1
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//
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// Mark a HIGHADJ entry as not suitable for reprocessing.
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//
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#define LDRP_RELOCATION_FINAL 0x2
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PIMAGE_BASE_RELOCATION
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LdrProcessRelocationBlockLongLong(
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IN ULONG_PTR VA,
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IN ULONG SizeOfBlock,
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IN PUSHORT NextOffset,
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IN LONGLONG Diff
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);
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#if defined(NTOS_KERNEL_RUNTIME)
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#if defined(ALLOC_PRAGMA)
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#pragma alloc_text(PAGE,LdrRelocateImage)
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#pragma alloc_text(PAGE,LdrRelocateImageWithBias)
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#pragma alloc_text(PAGE,LdrProcessRelocationBlock)
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#pragma alloc_text(PAGE,LdrProcessRelocationBlockLongLong)
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#endif // ALLOC_PRAGMA
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#if defined(_ALPHA_)
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PIMAGE_BASE_RELOCATION
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LdrpProcessVolatileRelocationBlock(
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IN ULONG_PTR VA,
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IN ULONG SizeOfBlock,
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IN PUSHORT NextOffset,
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IN LONG_PTR Diff,
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IN LONG_PTR OldDiff,
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IN ULONG_PTR OldBase
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);
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#if defined(ALLOC_PRAGMA)
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#pragma alloc_text(INIT,LdrDoubleRelocateImage)
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#pragma alloc_text(INIT,LdrpProcessVolatileRelocationBlock)
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#endif // ALLOC_PRAGMA
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#endif // _ALPHA_
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#endif // NTOS_KERNEL_RUNTIME
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#if defined(BLDR_KERNEL_RUNTIME)
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typedef LDR_RELOCATE_IMAGE_RETURN_TYPE ARC_STATUS;
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#else
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typedef LDR_RELOCATE_IMAGE_RETURN_TYPE NTSTATUS;
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#endif
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LDR_RELOCATE_IMAGE_RETURN_TYPE
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LdrRelocateImage (
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IN PVOID NewBase,
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IN CONST CHAR* LoaderName,
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IN LDR_RELOCATE_IMAGE_RETURN_TYPE Success,
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IN LDR_RELOCATE_IMAGE_RETURN_TYPE Conflict,
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IN LDR_RELOCATE_IMAGE_RETURN_TYPE Invalid
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)
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/*++
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Routine Description:
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This routine relocates an image file that was not loaded into memory
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at the preferred address.
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Arguments:
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NewBase - Supplies a pointer to the image base.
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LoaderName - Indicates which loader routine is being called from.
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Success - Value to return if relocation successful.
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Conflict - Value to return if can't relocate.
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Invalid - Value to return if relocations are invalid.
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Return Value:
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Success if image is relocated.
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Conflict if image can't be relocated.
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Invalid if image contains invalid fixups.
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--*/
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{
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//
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// Just call LdrRelocateImageWithBias() with a zero bias.
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//
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return LdrRelocateImageWithBias( NewBase,
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0,
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LoaderName,
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Success,
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Conflict,
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Invalid );
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}
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LDR_RELOCATE_IMAGE_RETURN_TYPE
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LdrRelocateImageWithBias (
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IN PVOID NewBase,
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IN LONGLONG AdditionalBias,
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IN CONST CHAR* LoaderName,
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IN LDR_RELOCATE_IMAGE_RETURN_TYPE Success,
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IN LDR_RELOCATE_IMAGE_RETURN_TYPE Conflict,
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IN LDR_RELOCATE_IMAGE_RETURN_TYPE Invalid
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)
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/*++
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Routine Description:
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This routine relocates an image file that was not loaded into memory
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at the preferred address.
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Arguments:
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NewBase - Supplies a pointer to the image base.
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AdditionalBias - An additional quantity to add to all fixups. The
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32-bit X86 loader uses this when loading 64-bit images
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to specify a NewBase that is actually a 64-bit value.
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LoaderName - Indicates which loader routine is being called from.
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Success - Value to return if relocation successful.
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Conflict - Value to return if can't relocate.
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Invalid - Value to return if relocations are invalid.
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Return Value:
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Success if image is relocated.
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Conflict if image can't be relocated.
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Invalid if image contains invalid fixups.
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--*/
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{
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LONGLONG Diff;
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ULONG TotalCountBytes = 0;
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ULONG_PTR VA;
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ULONG_PTR OldBase;
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ULONG SizeOfBlock;
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PUCHAR FixupVA;
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USHORT Offset;
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PUSHORT NextOffset = NULL;
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PIMAGE_NT_HEADERS NtHeaders;
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PIMAGE_BASE_RELOCATION NextBlock;
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LDR_RELOCATE_IMAGE_RETURN_TYPE Status;
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RTL_PAGED_CODE();
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NtHeaders = RtlImageNtHeader( NewBase );
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if ( NtHeaders ) {
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OldBase = NtHeaders->OptionalHeader.ImageBase;
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}
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else {
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Status = Invalid;
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goto Exit;
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}
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//
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// Locate the relocation section.
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//
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NextBlock = (PIMAGE_BASE_RELOCATION)RtlImageDirectoryEntryToData(
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NewBase, TRUE, IMAGE_DIRECTORY_ENTRY_BASERELOC, &TotalCountBytes);
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//
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// It is possible for a file to have no relocations, but the relocations
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// must not have been stripped.
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//
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if (!NextBlock || !TotalCountBytes) {
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if (NtHeaders->FileHeader.Characteristics & IMAGE_FILE_RELOCS_STRIPPED) {
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#if DBG
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DbgPrint("%s: Image can't be relocated, no fixup information.\n", LoaderName);
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#endif // DBG
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Status = Conflict;
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} else {
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Status = Success;
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}
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goto Exit;
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}
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//
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// If the image has a relocation table, then apply the specified fixup
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// information to the image.
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//
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Diff = (PCHAR)NewBase - (PCHAR)OldBase + AdditionalBias;
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while (TotalCountBytes) {
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SizeOfBlock = NextBlock->SizeOfBlock;
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TotalCountBytes -= SizeOfBlock;
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SizeOfBlock -= sizeof(IMAGE_BASE_RELOCATION);
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SizeOfBlock /= sizeof(USHORT);
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NextOffset = (PUSHORT)((PCHAR)NextBlock + sizeof(IMAGE_BASE_RELOCATION));
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VA = (ULONG_PTR)NewBase + NextBlock->VirtualAddress;
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if ( !(NextBlock = LdrProcessRelocationBlockLongLong( VA,
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SizeOfBlock,
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NextOffset,
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Diff)) ) {
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#if DBG
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DbgPrint("%s: Unknown base relocation type\n", LoaderName);
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#endif
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Status = Invalid;
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goto Exit;
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}
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}
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Status = Success;
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Exit:
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if (Status != Success) {
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DbgPrint(
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"%s: %s() failed 0x%lx\n"
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"%s: OldBase : %p\n"
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"%s: NewBase : %p\n"
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"%s: Diff : 0x%I64x\n"
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"%s: NextOffset : %p\n"
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"%s: *NextOffset : 0x%x\n"
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"%s: SizeOfBlock : 0x%lx\n",
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LoaderName, __FUNCTION__, Status,
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LoaderName, OldBase,
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LoaderName, NewBase,
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LoaderName, Diff,
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LoaderName, NextOffset,
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LoaderName, (NextOffset != NULL) ? *NextOffset : 0,
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LoaderName, SizeOfBlock
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);
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#if DBG
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DbgBreakPoint();
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#endif
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}
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return Status;
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}
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PIMAGE_BASE_RELOCATION
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LdrProcessRelocationBlock(
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IN ULONG_PTR VA,
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IN ULONG SizeOfBlock,
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IN PUSHORT NextOffset,
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IN LONG_PTR Diff
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)
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{
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PIMAGE_BASE_RELOCATION baseRelocation;
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baseRelocation = LdrProcessRelocationBlockLongLong( VA,
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SizeOfBlock,
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NextOffset,
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(LONGLONG)Diff );
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return baseRelocation;
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}
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PIMAGE_BASE_RELOCATION
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LdrProcessRelocationBlockLongLong(
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IN ULONG_PTR VA,
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IN ULONG SizeOfBlock,
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IN PUSHORT NextOffset,
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IN LONGLONG Diff
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)
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{
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PUCHAR FixupVA;
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USHORT Offset;
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LONG Temp;
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LONG TempOrig;
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ULONG Temp32;
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ULONGLONG Value64;
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LONGLONG Temp64;
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LONG_PTR ActualDiff;
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RTL_PAGED_CODE();
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while (SizeOfBlock--) {
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Offset = *NextOffset & (USHORT)0xfff;
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FixupVA = (PUCHAR)(VA + Offset);
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//
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// Apply the fixups.
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//
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switch ((*NextOffset) >> 12) {
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case IMAGE_REL_BASED_HIGHLOW :
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//
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// HighLow - (32-bits) relocate the high and low half
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// of an address.
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//
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*(LONG UNALIGNED *)FixupVA += (ULONG) Diff;
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break;
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case IMAGE_REL_BASED_HIGH :
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//
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// High - (16-bits) relocate the high half of an address.
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//
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Temp = *(PUSHORT)FixupVA << 16;
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Temp += (ULONG) Diff;
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*(PUSHORT)FixupVA = (USHORT)(Temp >> 16);
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break;
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case IMAGE_REL_BASED_HIGHADJ :
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//
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// Adjust high - (16-bits) relocate the high half of an
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// address and adjust for sign extension of low half.
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//
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#if defined(NTOS_KERNEL_RUNTIME)
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//
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// If the address has already been relocated then don't
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// process it again now or information will be lost.
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//
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if (Offset & LDRP_RELOCATION_FINAL) {
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++NextOffset;
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--SizeOfBlock;
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break;
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}
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#endif
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Temp = *(PUSHORT)FixupVA << 16;
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#if defined(BLDR_KERNEL_RUNTIME)
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TempOrig = Temp;
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#endif
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++NextOffset;
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--SizeOfBlock;
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Temp += (LONG)(*(PSHORT)NextOffset);
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Temp += (ULONG) Diff;
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Temp += 0x8000;
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*(PUSHORT)FixupVA = (USHORT)(Temp >> 16);
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#if defined(BLDR_KERNEL_RUNTIME)
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ActualDiff = ((((ULONG_PTR)(Temp - TempOrig)) >> 16) -
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(((ULONG_PTR)Diff) >> 16 ));
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if (ActualDiff == 1) {
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//
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// Mark the relocation as needing an increment if it is
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// relocated again.
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//
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*(NextOffset - 1) |= LDRP_RELOCATION_INCREMENT;
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}
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else if (ActualDiff != 0) {
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//
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// Mark the relocation as cannot be reprocessed.
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//
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*(NextOffset - 1) |= LDRP_RELOCATION_FINAL;
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}
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#endif
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break;
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case IMAGE_REL_BASED_LOW :
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//
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// Low - (16-bit) relocate the low half of an address.
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//
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Temp = *(PSHORT)FixupVA;
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Temp += (ULONG) Diff;
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*(PUSHORT)FixupVA = (USHORT)Temp;
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break;
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case IMAGE_REL_BASED_IA64_IMM64:
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//
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// Align it to bundle address before fixing up the
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// 64-bit immediate value of the movl instruction.
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//
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FixupVA = (PUCHAR)((ULONG_PTR)FixupVA & ~(15));
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Value64 = (ULONGLONG)0;
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//
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// Extract the lower 32 bits of IMM64 from bundle
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//
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EXT_IMM64(Value64,
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(PULONG)FixupVA + EMARCH_ENC_I17_IMM7B_INST_WORD_X,
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EMARCH_ENC_I17_IMM7B_SIZE_X,
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EMARCH_ENC_I17_IMM7B_INST_WORD_POS_X,
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EMARCH_ENC_I17_IMM7B_VAL_POS_X);
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EXT_IMM64(Value64,
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(PULONG)FixupVA + EMARCH_ENC_I17_IMM9D_INST_WORD_X,
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EMARCH_ENC_I17_IMM9D_SIZE_X,
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EMARCH_ENC_I17_IMM9D_INST_WORD_POS_X,
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EMARCH_ENC_I17_IMM9D_VAL_POS_X);
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EXT_IMM64(Value64,
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(PULONG)FixupVA + EMARCH_ENC_I17_IMM5C_INST_WORD_X,
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EMARCH_ENC_I17_IMM5C_SIZE_X,
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EMARCH_ENC_I17_IMM5C_INST_WORD_POS_X,
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EMARCH_ENC_I17_IMM5C_VAL_POS_X);
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EXT_IMM64(Value64,
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(PULONG)FixupVA + EMARCH_ENC_I17_IC_INST_WORD_X,
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EMARCH_ENC_I17_IC_SIZE_X,
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EMARCH_ENC_I17_IC_INST_WORD_POS_X,
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EMARCH_ENC_I17_IC_VAL_POS_X);
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EXT_IMM64(Value64,
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(PULONG)FixupVA + EMARCH_ENC_I17_IMM41a_INST_WORD_X,
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EMARCH_ENC_I17_IMM41a_SIZE_X,
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EMARCH_ENC_I17_IMM41a_INST_WORD_POS_X,
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EMARCH_ENC_I17_IMM41a_VAL_POS_X);
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EXT_IMM64(Value64,
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((PULONG)FixupVA + EMARCH_ENC_I17_IMM41b_INST_WORD_X),
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EMARCH_ENC_I17_IMM41b_SIZE_X,
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EMARCH_ENC_I17_IMM41b_INST_WORD_POS_X,
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EMARCH_ENC_I17_IMM41b_VAL_POS_X);
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EXT_IMM64(Value64,
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((PULONG)FixupVA + EMARCH_ENC_I17_IMM41c_INST_WORD_X),
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EMARCH_ENC_I17_IMM41c_SIZE_X,
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EMARCH_ENC_I17_IMM41c_INST_WORD_POS_X,
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EMARCH_ENC_I17_IMM41c_VAL_POS_X);
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EXT_IMM64(Value64,
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((PULONG)FixupVA + EMARCH_ENC_I17_SIGN_INST_WORD_X),
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EMARCH_ENC_I17_SIGN_SIZE_X,
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EMARCH_ENC_I17_SIGN_INST_WORD_POS_X,
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EMARCH_ENC_I17_SIGN_VAL_POS_X);
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//
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// Update 64-bit address
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//
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Value64+=Diff;
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//
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// Insert IMM64 into bundle
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//
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INS_IMM64(Value64,
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((PULONG)FixupVA + EMARCH_ENC_I17_IMM7B_INST_WORD_X),
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EMARCH_ENC_I17_IMM7B_SIZE_X,
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EMARCH_ENC_I17_IMM7B_INST_WORD_POS_X,
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EMARCH_ENC_I17_IMM7B_VAL_POS_X);
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INS_IMM64(Value64,
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((PULONG)FixupVA + EMARCH_ENC_I17_IMM9D_INST_WORD_X),
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EMARCH_ENC_I17_IMM9D_SIZE_X,
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EMARCH_ENC_I17_IMM9D_INST_WORD_POS_X,
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EMARCH_ENC_I17_IMM9D_VAL_POS_X);
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INS_IMM64(Value64,
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((PULONG)FixupVA + EMARCH_ENC_I17_IMM5C_INST_WORD_X),
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EMARCH_ENC_I17_IMM5C_SIZE_X,
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EMARCH_ENC_I17_IMM5C_INST_WORD_POS_X,
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EMARCH_ENC_I17_IMM5C_VAL_POS_X);
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INS_IMM64(Value64,
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((PULONG)FixupVA + EMARCH_ENC_I17_IC_INST_WORD_X),
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EMARCH_ENC_I17_IC_SIZE_X,
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EMARCH_ENC_I17_IC_INST_WORD_POS_X,
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EMARCH_ENC_I17_IC_VAL_POS_X);
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INS_IMM64(Value64,
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((PULONG)FixupVA + EMARCH_ENC_I17_IMM41a_INST_WORD_X),
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EMARCH_ENC_I17_IMM41a_SIZE_X,
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EMARCH_ENC_I17_IMM41a_INST_WORD_POS_X,
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EMARCH_ENC_I17_IMM41a_VAL_POS_X);
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INS_IMM64(Value64,
|
|
((PULONG)FixupVA + EMARCH_ENC_I17_IMM41b_INST_WORD_X),
|
|
EMARCH_ENC_I17_IMM41b_SIZE_X,
|
|
EMARCH_ENC_I17_IMM41b_INST_WORD_POS_X,
|
|
EMARCH_ENC_I17_IMM41b_VAL_POS_X);
|
|
INS_IMM64(Value64,
|
|
((PULONG)FixupVA + EMARCH_ENC_I17_IMM41c_INST_WORD_X),
|
|
EMARCH_ENC_I17_IMM41c_SIZE_X,
|
|
EMARCH_ENC_I17_IMM41c_INST_WORD_POS_X,
|
|
EMARCH_ENC_I17_IMM41c_VAL_POS_X);
|
|
INS_IMM64(Value64,
|
|
((PULONG)FixupVA + EMARCH_ENC_I17_SIGN_INST_WORD_X),
|
|
EMARCH_ENC_I17_SIGN_SIZE_X,
|
|
EMARCH_ENC_I17_SIGN_INST_WORD_POS_X,
|
|
EMARCH_ENC_I17_SIGN_VAL_POS_X);
|
|
break;
|
|
|
|
case IMAGE_REL_BASED_DIR64:
|
|
|
|
*(ULONGLONG UNALIGNED *)FixupVA += Diff;
|
|
|
|
break;
|
|
|
|
case IMAGE_REL_BASED_MIPS_JMPADDR :
|
|
//
|
|
// JumpAddress - (32-bits) relocate a MIPS jump address.
|
|
//
|
|
Temp = (*(PULONG)FixupVA & 0x3ffffff) << 2;
|
|
Temp += (ULONG) Diff;
|
|
*(PULONG)FixupVA = (*(PULONG)FixupVA & ~0x3ffffff) |
|
|
((Temp >> 2) & 0x3ffffff);
|
|
|
|
break;
|
|
|
|
case IMAGE_REL_BASED_ABSOLUTE :
|
|
//
|
|
// Absolute - no fixup required.
|
|
//
|
|
break;
|
|
|
|
case IMAGE_REL_BASED_SECTION :
|
|
//
|
|
// Section Relative reloc. Ignore for now.
|
|
//
|
|
break;
|
|
|
|
case IMAGE_REL_BASED_REL32 :
|
|
//
|
|
// Relative intrasection. Ignore for now.
|
|
//
|
|
break;
|
|
|
|
default :
|
|
//
|
|
// Illegal - illegal relocation type.
|
|
//
|
|
|
|
return (PIMAGE_BASE_RELOCATION)NULL;
|
|
}
|
|
++NextOffset;
|
|
}
|
|
return (PIMAGE_BASE_RELOCATION)NextOffset;
|
|
}
|
|
|
|
#if defined(NTOS_KERNEL_RUNTIME) && defined(_ALPHA_)
|
|
|
|
NTSTATUS
|
|
LdrDoubleRelocateImage (
|
|
IN PVOID NewBase,
|
|
IN PVOID CurrentBase,
|
|
IN CONST CHAR* LoaderName,
|
|
IN NTSTATUS Success,
|
|
IN NTSTATUS Conflict,
|
|
IN NTSTATUS Invalid
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine handles the volatile relocations that cannot be easily repeated
|
|
on an image file that has already been relocated at least once.
|
|
|
|
Since this only needs to be done once (at kernel startup time), the
|
|
decision was made to split this into a separate routine so as not to
|
|
impact the mainline code.
|
|
|
|
N.B. This function is for use by memory management ONLY.
|
|
|
|
Arguments:
|
|
|
|
NewBase - Supplies a pointer to the new (second relocated) image base.
|
|
|
|
CurrentBase - Supplies a pointer to the first relocated image base.
|
|
|
|
LoaderName - Indicates which loader routine is being called from.
|
|
|
|
Success - Value to return if relocation successful.
|
|
|
|
Conflict - Value to return if can't relocate.
|
|
|
|
Invalid - Value to return if relocations are invalid.
|
|
|
|
Return Value:
|
|
|
|
Success if image is relocated.
|
|
Conflict if image can't be relocated.
|
|
Invalid if image contains invalid fixups.
|
|
|
|
--*/
|
|
|
|
{
|
|
LONG_PTR Diff;
|
|
LONG_PTR OldDiff;
|
|
ULONG TotalCountBytes;
|
|
ULONG_PTR VA;
|
|
ULONG_PTR OldBase;
|
|
ULONG SizeOfBlock;
|
|
PUCHAR FixupVA;
|
|
USHORT Offset;
|
|
PUSHORT NextOffset;
|
|
PIMAGE_NT_HEADERS NtHeaders;
|
|
PIMAGE_BASE_RELOCATION NextBlock;
|
|
|
|
RTL_PAGED_CODE();
|
|
|
|
NtHeaders = RtlImageNtHeader( NewBase );
|
|
|
|
OldBase = NtHeaders->OptionalHeader.ImageBase;
|
|
OldDiff = (PCHAR)CurrentBase - (PCHAR)OldBase;
|
|
|
|
//
|
|
// Locate the relocation section.
|
|
//
|
|
|
|
NextBlock = (PIMAGE_BASE_RELOCATION)RtlImageDirectoryEntryToData(
|
|
NewBase, TRUE, IMAGE_DIRECTORY_ENTRY_BASERELOC, &TotalCountBytes);
|
|
|
|
if (!NextBlock || !TotalCountBytes) {
|
|
|
|
//
|
|
// The image does not contain a relocation table, and therefore
|
|
// cannot be relocated.
|
|
//
|
|
#if DBG
|
|
DbgPrint("%s: Image can't be relocated, no fixup information.\n", LoaderName);
|
|
#endif // DBG
|
|
return Conflict;
|
|
}
|
|
|
|
//
|
|
// If the image has a relocation table, then apply the specified fixup
|
|
// information to the image.
|
|
//
|
|
|
|
Diff = (PCHAR)NewBase - (PCHAR)OldBase;
|
|
|
|
while (TotalCountBytes) {
|
|
SizeOfBlock = NextBlock->SizeOfBlock;
|
|
TotalCountBytes -= SizeOfBlock;
|
|
SizeOfBlock -= sizeof(IMAGE_BASE_RELOCATION);
|
|
SizeOfBlock /= sizeof(USHORT);
|
|
NextOffset = (PUSHORT)((PCHAR)NextBlock + sizeof(IMAGE_BASE_RELOCATION));
|
|
|
|
VA = (ULONG_PTR)NewBase + NextBlock->VirtualAddress;
|
|
|
|
if ( !(NextBlock = LdrpProcessVolatileRelocationBlock(VA,SizeOfBlock,NextOffset,Diff, OldDiff, OldBase)) ) {
|
|
#if DBG
|
|
DbgPrint("%s: Unknown base relocation type\n", LoaderName);
|
|
#endif
|
|
return Invalid;
|
|
}
|
|
}
|
|
|
|
return Success;
|
|
}
|
|
|
|
PIMAGE_BASE_RELOCATION
|
|
LdrpProcessVolatileRelocationBlock(
|
|
IN ULONG_PTR VA,
|
|
IN ULONG SizeOfBlock,
|
|
IN PUSHORT NextOffset,
|
|
IN LONG_PTR Diff,
|
|
IN LONG_PTR OldDiff,
|
|
IN ULONG_PTR OldBase
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine handles the volatile relocations that cannot be easily repeated
|
|
on an image file that has already been relocated at least once.
|
|
|
|
Since this only needs to be done once (at kernel startup time), the
|
|
decision was made to split this into a separate routine so as not to
|
|
impact the mainline code.
|
|
|
|
N.B. This function is for use by memory management ONLY.
|
|
|
|
Arguments:
|
|
|
|
TBD.
|
|
|
|
Return Value:
|
|
|
|
Next relocation entry to process.
|
|
|
|
--*/
|
|
|
|
{
|
|
PUCHAR FixupVA;
|
|
USHORT Offset;
|
|
LONG Temp;
|
|
ULONG Temp32;
|
|
USHORT TempShort1;
|
|
USHORT TempShort2;
|
|
ULONGLONG Value64;
|
|
LONGLONG Temp64;
|
|
USHORT RelocationType;
|
|
IN PVOID CurrentBase;
|
|
|
|
RTL_PAGED_CODE();
|
|
|
|
CurrentBase = (PVOID)((ULONG_PTR)OldDiff + OldBase);
|
|
|
|
while (SizeOfBlock--) {
|
|
|
|
Offset = *NextOffset & (USHORT)0xfff;
|
|
FixupVA = (PUCHAR)(VA + Offset);
|
|
|
|
//
|
|
// Apply the fixups.
|
|
//
|
|
|
|
switch ((*NextOffset) >> 12) {
|
|
|
|
case IMAGE_REL_BASED_HIGHADJ :
|
|
//
|
|
// Adjust high - (16-bits) relocate the high half of an
|
|
// address and adjust for sign extension of low half.
|
|
//
|
|
|
|
//
|
|
// Return the relocation to its original state, checking for
|
|
// whether the entry was sign extended the 1st time it was
|
|
// relocated.
|
|
//
|
|
FixupVA = (PUCHAR)((LONG_PTR)FixupVA & (LONG_PTR)~(LDRP_RELOCATION_FINAL | LDRP_RELOCATION_INCREMENT));
|
|
Temp = *(PUSHORT)(FixupVA) << 16;
|
|
|
|
++NextOffset;
|
|
--SizeOfBlock;
|
|
|
|
// remove the carry bit from the low word
|
|
Temp -= ((LONG)(*(PSHORT)NextOffset) + (USHORT)OldDiff + 0x8000) & ~0xFFFF;
|
|
|
|
Temp -= (LONG)(OldDiff & ~0xffff);
|
|
|
|
Temp += (LONG)(*(PSHORT)NextOffset);
|
|
Temp += (ULONG) Diff;
|
|
Temp += 0x8000;
|
|
*(PUSHORT)FixupVA = (USHORT)(Temp >> 16);
|
|
|
|
//
|
|
// Mark the relocation as needing no further reprocessing.
|
|
//
|
|
*(NextOffset - 1) |= LDRP_RELOCATION_FINAL;
|
|
break;
|
|
|
|
default :
|
|
break;
|
|
}
|
|
++NextOffset;
|
|
}
|
|
return (PIMAGE_BASE_RELOCATION)NextOffset;
|
|
}
|
|
|
|
#endif // NTOS_KERNEL_RUNTIME && _ALPHA_
|