basepecoff.c

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    if (NumberOfRvaAndSizes > EFI_IMAGE_DIRECTORY_ENTRY_BASERELOC) {
      ImageContext->FixupDataSize = DirectoryEntry->Size / sizeof (UINT16) * sizeof (UINTN);
    } else {
      ImageContext->FixupDataSize = 0;
    }
  } else {
    DirectoryEntry              = &Hdr.Te->DataDirectory[0];
    ImageContext->FixupDataSize = DirectoryEntry->Size / sizeof (UINT16) * sizeof (UINTN);
  }
  //
  // Consumer must allocate a buffer for the relocation fixup log.
  // Only used for runtime drivers.
  //
  ImageContext->FixupData = NULL;

  //
  // Load the Codeview info if present
  //
  if (ImageContext->DebugDirectoryEntryRva != 0) {
    if (!(ImageContext->IsTeImage)) {
      DebugEntry = PeCoffLoaderImageAddress (
                    ImageContext,
                    ImageContext->DebugDirectoryEntryRva
                    );
    } else {
      DebugEntry = (EFI_IMAGE_DEBUG_DIRECTORY_ENTRY *)(UINTN)(
                      ImageContext->ImageAddress +
                      ImageContext->DebugDirectoryEntryRva +
                      sizeof(EFI_TE_IMAGE_HEADER) -
                      Hdr.Te->StrippedSize
                      );
    }

    if (DebugEntry != NULL) {
      TempDebugEntryRva = DebugEntry->RVA;
      if (DebugEntry->RVA == 0 && DebugEntry->FileOffset != 0) {
        Section--;
        if ((UINTN)Section->SizeOfRawData < Section->Misc.VirtualSize) {
          TempDebugEntryRva = Section->VirtualAddress + Section->Misc.VirtualSize;
        } else {
          TempDebugEntryRva = Section->VirtualAddress + Section->SizeOfRawData;
        }
      }

      if (TempDebugEntryRva != 0) {
        if (!(ImageContext->IsTeImage)) {
          ImageContext->CodeView = PeCoffLoaderImageAddress (ImageContext, TempDebugEntryRva);
        } else {
          ImageContext->CodeView = (VOID *)(
                                    (UINTN)ImageContext->ImageAddress +
                                    (UINTN)TempDebugEntryRva +
                                    (UINTN)sizeof (EFI_TE_IMAGE_HEADER) -
                                    (UINTN) Hdr.Te->StrippedSize
                                    );
        }

        if (ImageContext->CodeView == NULL) {
          ImageContext->ImageError = IMAGE_ERROR_IMAGE_READ;
          return RETURN_LOAD_ERROR;
        }

        if (DebugEntry->RVA == 0) {
          Size = DebugEntry->SizeOfData;
          if (!(ImageContext->IsTeImage)) {
            Status = ImageContext->ImageRead (
                                    ImageContext->Handle,
                                    DebugEntry->FileOffset,
                                    &Size,
                                    ImageContext->CodeView
                                    );
          } else {
            Status = ImageContext->ImageRead (
                                    ImageContext->Handle,
                                    DebugEntry->FileOffset + sizeof (EFI_TE_IMAGE_HEADER) - Hdr.Te->StrippedSize,
                                    &Size,
                                    ImageContext->CodeView
                                    );
            //
            // Should we apply fix up to this field according to the size difference between PE and TE?
            // Because now we maintain TE header fields unfixed, this field will also remain as they are
            // in original PE image.
            //
          }

          if (RETURN_ERROR (Status)) {
            ImageContext->ImageError = IMAGE_ERROR_IMAGE_READ;
            return RETURN_LOAD_ERROR;
          }

          DebugEntry->RVA = TempDebugEntryRva;
        }

        switch (*(UINT32 *) ImageContext->CodeView) {
        case CODEVIEW_SIGNATURE_NB10:
          ImageContext->PdbPointer = (CHAR8 *)ImageContext->CodeView + sizeof (EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY);
          break;

        case CODEVIEW_SIGNATURE_RSDS:
          ImageContext->PdbPointer = (CHAR8 *)ImageContext->CodeView + sizeof (EFI_IMAGE_DEBUG_CODEVIEW_RSDS_ENTRY);
          break;

        default:
          break;
        }
      }
    }
  }

  return Status;
}


/**
  Reapply fixups on a fixed up PE32/PE32+ image to allow virutal calling at EFI
  runtime.

  PE_COFF_LOADER_IMAGE_CONTEXT.FixupData stores information needed to reapply
  the fixups with a virtual mapping.


  @param  ImageBase          Base address of relocated image
  @param  VirtImageBase      Virtual mapping for ImageBase
  @param  ImageSize          Size of the image to relocate
  @param  RelocationData     Location to place results of read

**/
VOID
EFIAPI
PeCoffLoaderRelocateImageForRuntime (
  IN  PHYSICAL_ADDRESS        ImageBase,
  IN  PHYSICAL_ADDRESS        VirtImageBase,
  IN  UINTN                   ImageSize,
  IN  VOID                    *RelocationData
  )
{
  CHAR8                               *OldBase;
  CHAR8                               *NewBase;
  EFI_IMAGE_DOS_HEADER                *DosHdr;
  EFI_IMAGE_OPTIONAL_HEADER_PTR_UNION Hdr;
  UINT32                              NumberOfRvaAndSizes;
  EFI_IMAGE_DATA_DIRECTORY            *DataDirectory;
  EFI_IMAGE_DATA_DIRECTORY            *RelocDir;
  EFI_IMAGE_BASE_RELOCATION           *RelocBase;
  EFI_IMAGE_BASE_RELOCATION           *RelocBaseEnd;
  UINT16                              *Reloc;
  UINT16                              *RelocEnd;
  CHAR8                               *Fixup;
  CHAR8                               *FixupBase;
  UINT16                              *F16;
  UINT32                              *F32;
  UINT64                              *F64;
  CHAR8                               *FixupData;
  UINTN                               Adjust;
  RETURN_STATUS                       Status;

  OldBase = (CHAR8 *)((UINTN)ImageBase);
  NewBase = (CHAR8 *)((UINTN)VirtImageBase);
  Adjust = (UINTN) NewBase - (UINTN) OldBase;

  //
  // Find the image's relocate dir info
  //
  DosHdr = (EFI_IMAGE_DOS_HEADER *)OldBase;
  if (DosHdr->e_magic == EFI_IMAGE_DOS_SIGNATURE) {
    //
    // Valid DOS header so get address of PE header
    //
    Hdr.Pe32 = (EFI_IMAGE_NT_HEADERS32 *)(((CHAR8 *)DosHdr) + DosHdr->e_lfanew);
  } else {
    //
    // No Dos header so assume image starts with PE header.
    //
    Hdr.Pe32 = (EFI_IMAGE_NT_HEADERS32 *)OldBase;
  }

  if (Hdr.Pe32->Signature != EFI_IMAGE_NT_SIGNATURE) {
    //
    // Not a valid PE image so Exit
    //
    return ;
  }

  //
  // Get some data from the PE type dependent data
  //
  if (Hdr.Pe32->OptionalHeader.Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
    //
    // Use PE32 offset
    //
    NumberOfRvaAndSizes = Hdr.Pe32->OptionalHeader.NumberOfRvaAndSizes;
    DataDirectory = (EFI_IMAGE_DATA_DIRECTORY *)&(Hdr.Pe32->OptionalHeader.DataDirectory[0]);
  } else {
    //
    // Use PE32+ offset
    //
    NumberOfRvaAndSizes = Hdr.Pe32Plus->OptionalHeader.NumberOfRvaAndSizes;
    DataDirectory = (EFI_IMAGE_DATA_DIRECTORY *)&(Hdr.Pe32Plus->OptionalHeader.DataDirectory[0]);
  }

  //
  // Find the relocation block
  //
  // Per the PE/COFF spec, you can't assume that a given data directory
  // is present in the image. You have to check the NumberOfRvaAndSizes in
  // the optional header to verify a desired directory entry is there.
  //
  if (NumberOfRvaAndSizes > EFI_IMAGE_DIRECTORY_ENTRY_BASERELOC) {
    RelocDir      = DataDirectory + EFI_IMAGE_DIRECTORY_ENTRY_BASERELOC;
    RelocBase     = (EFI_IMAGE_BASE_RELOCATION *)(UINTN)(ImageBase + RelocDir->VirtualAddress);
    RelocBaseEnd  = (EFI_IMAGE_BASE_RELOCATION *)(UINTN)(ImageBase + RelocDir->VirtualAddress + RelocDir->Size);
  } else {
    //
    // Cannot find relocations, cannot continue
    //
    ASSERT (FALSE);
    return ;
  }

  ASSERT (RelocBase != NULL && RelocBaseEnd != NULL);

  //
  // Run the whole relocation block. And re-fixup data that has not been
  // modified. The FixupData is used to see if the image has been modified
  // since it was relocated. This is so data sections that have been updated
  // by code will not be fixed up, since that would set them back to
  // defaults.
  //
  FixupData = RelocationData;
  while (RelocBase < RelocBaseEnd) {

    Reloc     = (UINT16 *) ((UINT8 *) RelocBase + sizeof (EFI_IMAGE_BASE_RELOCATION));
    RelocEnd  = (UINT16 *) ((UINT8 *) RelocBase + RelocBase->SizeOfBlock);
    FixupBase = (CHAR8 *) ((UINTN)ImageBase) + RelocBase->VirtualAddress;

    //
    // Run this relocation record
    //
    while (Reloc < RelocEnd) {

      Fixup = FixupBase + (*Reloc & 0xFFF);
      switch ((*Reloc) >> 12) {

      case EFI_IMAGE_REL_BASED_ABSOLUTE:
        break;

      case EFI_IMAGE_REL_BASED_HIGH:
        F16 = (UINT16 *) Fixup;
        if (*(UINT16 *) FixupData == *F16) {
          *F16 = (UINT16) (*F16 + ((UINT16) ((UINT32) Adjust >> 16)));
        }

        FixupData = FixupData + sizeof (UINT16);
        break;

      case EFI_IMAGE_REL_BASED_LOW:
        F16 = (UINT16 *) Fixup;
        if (*(UINT16 *) FixupData == *F16) {
          *F16 = (UINT16) (*F16 + ((UINT16) Adjust & 0xffff));
        }

        FixupData = FixupData + sizeof (UINT16);
        break;

      case EFI_IMAGE_REL_BASED_HIGHLOW:
        F32       = (UINT32 *) Fixup;
        FixupData = ALIGN_POINTER (FixupData, sizeof (UINT32));
        if (*(UINT32 *) FixupData == *F32) {
          *F32 = *F32 + (UINT32) Adjust;
        }

        FixupData = FixupData + sizeof (UINT32);
        break;

      case EFI_IMAGE_REL_BASED_DIR64:
        F64       = (UINT64 *)Fixup;
        FixupData = ALIGN_POINTER (FixupData, sizeof (UINT64));
        if (*(UINT64 *) FixupData == *F64) {
          *F64 = *F64 + (UINT64)Adjust;
        }

        FixupData = FixupData + sizeof (UINT64);
        break;

      case EFI_IMAGE_REL_BASED_HIGHADJ:
        //
        // Not implemented, but not used in EFI 1.0
        //
        ASSERT (FALSE);
        break;

      default:
        //
        // Only Itanium requires ConvertPeImage_Ex
        //
        Status = PeHotRelocateImageEx (Reloc, Fixup, &FixupData, Adjust);
        if (RETURN_ERROR (Status)) {
          return ;
        }
      }
      //
      // Next relocation record
      //
      Reloc += 1;
    }
    //
    // next reloc block
    //
    RelocBase = (EFI_IMAGE_BASE_RELOCATION *) RelocEnd;
  }
}


/**
  ImageRead function that operates on a memory buffer whos base is passed into
  FileHandle.

  @param  FileHandle        Ponter to baes of the input stream
  @param  FileOffset        Offset to the start of the buffer
  @param  ReadSize          Number of bytes to copy into the buffer
  @param  Buffer            Location to place results of read

  @retval RETURN_SUCCESS    Data is read from FileOffset from the Handle into
                            the buffer.
**/
RETURN_STATUS
EFIAPI
PeCoffLoaderImageReadFromMemory (
  IN     VOID    *FileHandle,
  IN     UINTN   FileOffset,
  IN OUT UINTN   *ReadSize,
  OUT    VOID    *Buffer
  )
{
  CopyMem (Buffer, ((UINT8 *)FileHandle) + FileOffset, *ReadSize);
  return RETURN_SUCCESS;
}