/** @file

Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>

This program and the accompanying materials are licensed and made available
under the terms and conditions of the BSD License which accompanies this
distribution.  The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php

THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include "WinNtInclude.h"

#ifndef __GNUC__
#include <windows.h>
#include <io.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <ctype.h>

#include <Common/UefiBaseTypes.h>
#include <IndustryStandard/PeImage.h>

#include "PeCoffLib.h"
#include "EfiUtilityMsgs.h"

#include "GenFw.h"
#include "ElfConvert.h"
#include "Elf64Convert.h"

STATIC
VOID
ScanSections64 (
  VOID
  );

STATIC
BOOLEAN
WriteSections64 (
  SECTION_FILTER_TYPES  FilterType
  );

STATIC
VOID
WriteRelocations64 (
  VOID
  );

STATIC
VOID
WriteDebug64 (
  VOID
  );

STATIC
VOID
SetImageSize64 (
  VOID
  );

STATIC
VOID
CleanUp64 (
  VOID
  );

//
// Rename ELF32 strucutres to common names to help when porting to ELF64.
//
typedef Elf64_Shdr Elf_Shdr;
typedef Elf64_Ehdr Elf_Ehdr;
typedef Elf64_Rel Elf_Rel;
typedef Elf64_Rela Elf_Rela;
typedef Elf64_Sym Elf_Sym;
typedef Elf64_Phdr Elf_Phdr;
typedef Elf64_Dyn Elf_Dyn;
#define ELFCLASS ELFCLASS64
#define ELF_R_TYPE(r) ELF64_R_TYPE(r)
#define ELF_R_SYM(r) ELF64_R_SYM(r)

//
// Well known ELF structures.
//
STATIC Elf_Ehdr *mEhdr;
STATIC Elf_Shdr *mShdrBase;
STATIC Elf_Phdr *mPhdrBase;

//
// Coff information
//
STATIC const UINT32 mCoffAlignment = 0x20;

//
// PE section alignment.
//
STATIC const UINT16 mCoffNbrSections = 5;

//
// ELF sections to offset in Coff file.
//
STATIC UINT32 *mCoffSectionsOffset = NULL;

//
// Offsets in COFF file
//
STATIC UINT32 mNtHdrOffset;
STATIC UINT32 mTextOffset;
STATIC UINT32 mDataOffset;
STATIC UINT32 mHiiRsrcOffset;
STATIC UINT32 mRelocOffset;

//
// Initialization Function
//
BOOLEAN
InitializeElf64 (
  UINT8               *FileBuffer,
  ELF_FUNCTION_TABLE  *ElfFunctions
  )
{
  //
  // Initialize data pointer and structures.
  //
  VerboseMsg ("Set EHDR");
  mEhdr = (Elf_Ehdr*) FileBuffer;

  //
  // Check the ELF64 specific header information.
  //
  VerboseMsg ("Check ELF64 Header Information");
  if (mEhdr->e_ident[EI_CLASS] != ELFCLASS64) {
    Error (NULL, 0, 3000, "Unsupported", "ELF EI_DATA not ELFCLASS64");
    return FALSE;
  }
  if (mEhdr->e_ident[EI_DATA] != ELFDATA2LSB) {
    Error (NULL, 0, 3000, "Unsupported", "ELF EI_DATA not ELFDATA2LSB");
    return FALSE;
  }
  if ((mEhdr->e_type != ET_EXEC) && (mEhdr->e_type != ET_DYN)) {
    Error (NULL, 0, 3000, "Unsupported", "ELF e_type not ET_EXEC or ET_DYN");
    return FALSE;
  }
  if (!((mEhdr->e_machine == EM_X86_64))) {
    Error (NULL, 0, 3000, "Unsupported", "ELF e_machine not EM_X86_64");
    return FALSE;
  }
  if (mEhdr->e_version != EV_CURRENT) {
    Error (NULL, 0, 3000, "Unsupported", "ELF e_version (%u) not EV_CURRENT (%d)", (unsigned) mEhdr->e_version, EV_CURRENT);
    return FALSE;
  }

  //
  // Update section header pointers
  //
  VerboseMsg ("Update Header Pointers");
  mShdrBase  = (Elf_Shdr *)((UINT8 *)mEhdr + mEhdr->e_shoff);
  mPhdrBase = (Elf_Phdr *)((UINT8 *)mEhdr + mEhdr->e_phoff);

  //
  // Create COFF Section offset buffer and zero.
  //
  VerboseMsg ("Create COFF Section Offset Buffer");
  mCoffSectionsOffset = (UINT32 *)malloc(mEhdr->e_shnum * sizeof (UINT32));
  memset(mCoffSectionsOffset, 0, mEhdr->e_shnum * sizeof(UINT32));

  //
  // Fill in function pointers.
  //
  VerboseMsg ("Fill in Function Pointers");
  ElfFunctions->ScanSections = ScanSections64;
  ElfFunctions->WriteSections = WriteSections64;
  ElfFunctions->WriteRelocations = WriteRelocations64;
  ElfFunctions->WriteDebug = WriteDebug64;
  ElfFunctions->SetImageSize = SetImageSize64;
  ElfFunctions->CleanUp = CleanUp64;

  return TRUE;
}


//
// Header by Index functions
//
STATIC
Elf_Shdr*
GetShdrByIndex (
  UINT32 Num
  )
{
  if (Num >= mEhdr->e_shnum)
    return NULL;
  return (Elf_Shdr*)((UINT8*)mShdrBase + Num * mEhdr->e_shentsize);
}

STATIC
UINT32
CoffAlign (
  UINT32 Offset
  )
{
  return (Offset + mCoffAlignment - 1) & ~(mCoffAlignment - 1);
}

//
// filter functions
//
STATIC
BOOLEAN
IsTextShdr (
  Elf_Shdr *Shdr
  )
{
  return (BOOLEAN) ((Shdr->sh_flags & (SHF_WRITE | SHF_ALLOC)) == SHF_ALLOC);
}

STATIC
BOOLEAN
IsHiiRsrcShdr (
  Elf_Shdr *Shdr
  )
{
  Elf_Shdr *Namedr = GetShdrByIndex(mEhdr->e_shstrndx);

  return (BOOLEAN) (strcmp((CHAR8*)mEhdr + Namedr->sh_offset + Shdr->sh_name, ELF_HII_SECTION_NAME) == 0);
}

STATIC
BOOLEAN
IsDataShdr (
  Elf_Shdr *Shdr
  )
{
  if (IsHiiRsrcShdr(Shdr)) {
    return FALSE;
  }
  return (BOOLEAN) (Shdr->sh_flags & (SHF_WRITE | SHF_ALLOC)) == (SHF_ALLOC | SHF_WRITE);
}

//
// Elf functions interface implementation
//

STATIC
VOID
ScanSections64 (
  VOID
  )
{
  UINT32                          i;
  EFI_IMAGE_DOS_HEADER            *DosHdr;
  EFI_IMAGE_OPTIONAL_HEADER_UNION *NtHdr;
  UINT32                          CoffEntry;

  CoffEntry = 0;
  mCoffOffset = 0;

  //
  // Coff file start with a DOS header.
  //
  mCoffOffset = sizeof(EFI_IMAGE_DOS_HEADER) + 0x40;
  mNtHdrOffset = mCoffOffset;
  switch (mEhdr->e_machine) {
  case EM_X86_64:
  case EM_IA_64:
    mCoffOffset += sizeof (EFI_IMAGE_NT_HEADERS64);
  break;
  default:
    VerboseMsg ("%s unknown e_machine type. Assume X64", (UINTN)mEhdr->e_machine);
    mCoffOffset += sizeof (EFI_IMAGE_NT_HEADERS64);
  break;
  }

  mTableOffset = mCoffOffset;
  mCoffOffset += mCoffNbrSections * sizeof(EFI_IMAGE_SECTION_HEADER);

  //
  // First text sections.
  //
  mCoffOffset = CoffAlign(mCoffOffset);
  mTextOffset = mCoffOffset;
  for (i = 0; i < mEhdr->e_shnum; i++) {
    Elf_Shdr *shdr = GetShdrByIndex(i);
    if (IsTextShdr(shdr)) {
      if ((shdr->sh_addralign != 0) && (shdr->sh_addralign != 1)) {
        // the alignment field is valid
        if ((shdr->sh_addr & (shdr->sh_addralign - 1)) == 0) {
          // if the section address is aligned we must align PE/COFF
          mCoffOffset = (UINT32) ((mCoffOffset + shdr->sh_addralign - 1) & ~(shdr->sh_addralign - 1));
        } else if ((shdr->sh_addr % shdr->sh_addralign) != (mCoffOffset % shdr->sh_addralign)) {
          // ARM RVCT tools have behavior outside of the ELF specification to try
          // and make images smaller.  If sh_addr is not aligned to sh_addralign
          // then the section needs to preserve sh_addr MOD sh_addralign.
          // Normally doing nothing here works great.
          Error (NULL, 0, 3000, "Invalid", "Unsupported section alignment.");
        }
      }

      /* Relocate entry.  */
      if ((mEhdr->e_entry >= shdr->sh_addr) &&
          (mEhdr->e_entry < shdr->sh_addr + shdr->sh_size)) {
        CoffEntry = (UINT32) (mCoffOffset + mEhdr->e_entry - shdr->sh_addr);
      }
      mCoffSectionsOffset[i] = mCoffOffset;
      mCoffOffset += (UINT32) shdr->sh_size;
    }
  }

  if (mEhdr->e_machine != EM_ARM) {
    mCoffOffset = CoffAlign(mCoffOffset);
  }

  //
  //  Then data sections.
  //
  mDataOffset = mCoffOffset;
  for (i = 0; i < mEhdr->e_shnum; i++) {
    Elf_Shdr *shdr = GetShdrByIndex(i);
    if (IsDataShdr(shdr)) {
      if ((shdr->sh_addralign != 0) && (shdr->sh_addralign != 1)) {
        // the alignment field is valid
        if ((shdr->sh_addr & (shdr->sh_addralign - 1)) == 0) {
          // if the section address is aligned we must align PE/COFF
          mCoffOffset = (UINT32) ((mCoffOffset + shdr->sh_addralign - 1) & ~(shdr->sh_addralign - 1));
        } else if ((shdr->sh_addr % shdr->sh_addralign) != (mCoffOffset % shdr->sh_addralign)) {
          // ARM RVCT tools have behavior outside of the ELF specification to try
          // and make images smaller.  If sh_addr is not aligned to sh_addralign
          // then the section needs to preserve sh_addr MOD sh_addralign.
          // Normally doing nothing here works great.
          Error (NULL, 0, 3000, "Invalid", "Unsupported section alignment.");
        }
      }
      mCoffSectionsOffset[i] = mCoffOffset;
      mCoffOffset += (UINT32) shdr->sh_size;
    }
  }
  mCoffOffset = CoffAlign(mCoffOffset);

  //
  //  The HII resource sections.
  //
  mHiiRsrcOffset = mCoffOffset;
  for (i = 0; i < mEhdr->e_shnum; i++) {
    Elf_Shdr *shdr = GetShdrByIndex(i);
    if (IsHiiRsrcShdr(shdr)) {
      if ((shdr->sh_addralign != 0) && (shdr->sh_addralign != 1)) {
        // the alignment field is valid
        if ((shdr->sh_addr & (shdr->sh_addralign - 1)) == 0) {
          // if the section address is aligned we must align PE/COFF
          mCoffOffset = (UINT32) ((mCoffOffset + shdr->sh_addralign - 1) & ~(shdr->sh_addralign - 1));
        } else if ((shdr->sh_addr % shdr->sh_addralign) != (mCoffOffset % shdr->sh_addralign)) {
          // ARM RVCT tools have behavior outside of the ELF specification to try
          // and make images smaller.  If sh_addr is not aligned to sh_addralign
          // then the section needs to preserve sh_addr MOD sh_addralign.
          // Normally doing nothing here works great.
          Error (NULL, 0, 3000, "Invalid", "Unsupported section alignment.");
        }
      }
      if (shdr->sh_size != 0) {
        mCoffSectionsOffset[i] = mCoffOffset;
        mCoffOffset += (UINT32) shdr->sh_size;
        mCoffOffset = CoffAlign(mCoffOffset);
        SetHiiResourceHeader ((UINT8*) mEhdr + shdr->sh_offset, mHiiRsrcOffset);
      }
      break;
    }
  }

  mRelocOffset = mCoffOffset;

  //
  // Allocate base Coff file.  Will be expanded later for relocations.
  //
  mCoffFile = (UINT8 *)malloc(mCoffOffset);
  memset(mCoffFile, 0, mCoffOffset);

  //
  // Fill headers.
  //
  DosHdr = (EFI_IMAGE_DOS_HEADER *)mCoffFile;
  DosHdr->e_magic = EFI_IMAGE_DOS_SIGNATURE;
  DosHdr->e_lfanew = mNtHdrOffset;

  NtHdr = (EFI_IMAGE_OPTIONAL_HEADER_UNION*)(mCoffFile + mNtHdrOffset);

  NtHdr->Pe32Plus.Signature = EFI_IMAGE_NT_SIGNATURE;

  switch (mEhdr->e_machine) {
  case EM_X86_64:
    NtHdr->Pe32Plus.FileHeader.Machine = EFI_IMAGE_MACHINE_X64;
    NtHdr->Pe32Plus.OptionalHeader.Magic = EFI_IMAGE_NT_OPTIONAL_HDR64_MAGIC;
    break;
  case EM_IA_64:
    NtHdr->Pe32Plus.FileHeader.Machine = EFI_IMAGE_MACHINE_IPF;
    NtHdr->Pe32Plus.OptionalHeader.Magic = EFI_IMAGE_NT_OPTIONAL_HDR64_MAGIC;
    break;
  default:
    VerboseMsg ("%s unknown e_machine type. Assume X64", (UINTN)mEhdr->e_machine);
    NtHdr->Pe32Plus.FileHeader.Machine = EFI_IMAGE_MACHINE_X64;
    NtHdr->Pe32Plus.OptionalHeader.Magic = EFI_IMAGE_NT_OPTIONAL_HDR64_MAGIC;
  }

  NtHdr->Pe32Plus.FileHeader.NumberOfSections = mCoffNbrSections;
  NtHdr->Pe32Plus.FileHeader.TimeDateStamp = (UINT32) time(NULL);
  mImageTimeStamp = NtHdr->Pe32Plus.FileHeader.TimeDateStamp;
  NtHdr->Pe32Plus.FileHeader.PointerToSymbolTable = 0;
  NtHdr->Pe32Plus.FileHeader.NumberOfSymbols = 0;
  NtHdr->Pe32Plus.FileHeader.SizeOfOptionalHeader = sizeof(NtHdr->Pe32Plus.OptionalHeader);
  NtHdr->Pe32Plus.FileHeader.Characteristics = EFI_IMAGE_FILE_EXECUTABLE_IMAGE
    | EFI_IMAGE_FILE_LINE_NUMS_STRIPPED
    | EFI_IMAGE_FILE_LOCAL_SYMS_STRIPPED
    | EFI_IMAGE_FILE_LARGE_ADDRESS_AWARE;

  NtHdr->Pe32Plus.OptionalHeader.SizeOfCode = mDataOffset - mTextOffset;
  NtHdr->Pe32Plus.OptionalHeader.SizeOfInitializedData = mRelocOffset - mDataOffset;
  NtHdr->Pe32Plus.OptionalHeader.SizeOfUninitializedData = 0;
  NtHdr->Pe32Plus.OptionalHeader.AddressOfEntryPoint = CoffEntry;

  NtHdr->Pe32Plus.OptionalHeader.BaseOfCode = mTextOffset;

  NtHdr->Pe32Plus.OptionalHeader.ImageBase = 0;
  NtHdr->Pe32Plus.OptionalHeader.SectionAlignment = mCoffAlignment;
  NtHdr->Pe32Plus.OptionalHeader.FileAlignment = mCoffAlignment;
  NtHdr->Pe32Plus.OptionalHeader.SizeOfImage = 0;

  NtHdr->Pe32Plus.OptionalHeader.SizeOfHeaders = mTextOffset;
  NtHdr->Pe32Plus.OptionalHeader.NumberOfRvaAndSizes = EFI_IMAGE_NUMBER_OF_DIRECTORY_ENTRIES;

  //
  // Section headers.
  //
  if ((mDataOffset - mTextOffset) > 0) {
    CreateSectionHeader (".text", mTextOffset, mDataOffset - mTextOffset,
            EFI_IMAGE_SCN_CNT_CODE
            | EFI_IMAGE_SCN_MEM_EXECUTE
            | EFI_IMAGE_SCN_MEM_READ);
  } else {
    // Don't make a section of size 0.
    NtHdr->Pe32Plus.FileHeader.NumberOfSections--;
  }

  if ((mHiiRsrcOffset - mDataOffset) > 0) {
    CreateSectionHeader (".data", mDataOffset, mHiiRsrcOffset - mDataOffset,
            EFI_IMAGE_SCN_CNT_INITIALIZED_DATA
            | EFI_IMAGE_SCN_MEM_WRITE
            | EFI_IMAGE_SCN_MEM_READ);
  } else {
    // Don't make a section of size 0.
    NtHdr->Pe32Plus.FileHeader.NumberOfSections--;
  }

  if ((mRelocOffset - mHiiRsrcOffset) > 0) {
    CreateSectionHeader (".rsrc", mHiiRsrcOffset, mRelocOffset - mHiiRsrcOffset,
            EFI_IMAGE_SCN_CNT_INITIALIZED_DATA
            | EFI_IMAGE_SCN_MEM_READ);

    NtHdr->Pe32Plus.OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_RESOURCE].Size = mRelocOffset - mHiiRsrcOffset;
    NtHdr->Pe32Plus.OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_RESOURCE].VirtualAddress = mHiiRsrcOffset;
  } else {
    // Don't make a section of size 0.
    NtHdr->Pe32Plus.FileHeader.NumberOfSections--;
  }

}

STATIC
BOOLEAN
WriteSections64 (
  SECTION_FILTER_TYPES  FilterType
  )
{
  UINT32      Idx;
  Elf_Shdr    *SecShdr;
  UINT32      SecOffset;
  BOOLEAN     (*Filter)(Elf_Shdr *);

  //
  // Initialize filter pointer
  //
  switch (FilterType) {
    case SECTION_TEXT:
      Filter = IsTextShdr;
      break;
    case SECTION_HII:
      Filter = IsHiiRsrcShdr;
      break;
    case SECTION_DATA:
      Filter = IsDataShdr;
      break;
    default:
      return FALSE;
  }

  //
  // First: copy sections.
  //
  for (Idx = 0; Idx < mEhdr->e_shnum; Idx++) {
    Elf_Shdr *Shdr = GetShdrByIndex(Idx);
    if ((*Filter)(Shdr)) {
      switch (Shdr->sh_type) {
      case SHT_PROGBITS:
        /* Copy.  */
        memcpy(mCoffFile + mCoffSectionsOffset[Idx],
              (UINT8*)mEhdr + Shdr->sh_offset,
              (size_t) Shdr->sh_size);
        break;

      case SHT_NOBITS:
        memset(mCoffFile + mCoffSectionsOffset[Idx], 0, (size_t) Shdr->sh_size);
        break;

      default:
        //
        //  Ignore for unkown section type.
        //
        VerboseMsg ("%s unknown section type %x. We directly copy this section into Coff file", mInImageName, (unsigned)Shdr->sh_type);
        break;
      }
    }
  }

  //
  // Second: apply relocations.
  //
  VerboseMsg ("Applying Relocations...");
  for (Idx = 0; Idx < mEhdr->e_shnum; Idx++) {
    Elf_Shdr *RelShdr = GetShdrByIndex(Idx);
    if ((RelShdr->sh_type != SHT_REL) && (RelShdr->sh_type != SHT_RELA)) {
      continue;
    }
    SecShdr = GetShdrByIndex(RelShdr->sh_info);
    SecOffset = mCoffSectionsOffset[RelShdr->sh_info];
    if (RelShdr->sh_type == SHT_RELA && (*Filter)(SecShdr)) {
      UINT64 RelIdx;
      Elf_Shdr *SymtabShdr = GetShdrByIndex(RelShdr->sh_link);
      UINT8 *Symtab = (UINT8*)mEhdr + SymtabShdr->sh_offset;
      for (RelIdx = 0; RelIdx < RelShdr->sh_size; RelIdx += (UINT32) RelShdr->sh_entsize) {
        Elf_Rela *Rel = (Elf_Rela *)((UINT8*)mEhdr + RelShdr->sh_offset + RelIdx);
        Elf_Sym  *Sym = (Elf_Sym *)(Symtab + ELF_R_SYM(Rel->r_info) * SymtabShdr->sh_entsize);
        Elf_Shdr *SymShdr;
        UINT8    *Targ;

        if (Sym->st_shndx == SHN_UNDEF
            || Sym->st_shndx == SHN_ABS
            || Sym->st_shndx > mEhdr->e_shnum) {
          Error (NULL, 0, 3000, "Invalid", "%s bad symbol definition.", mInImageName);
        }
        SymShdr = GetShdrByIndex(Sym->st_shndx);

        //
        // Note: r_offset in a memory address.
        //  Convert it to a pointer in the coff file.
        //
        Targ = mCoffFile + SecOffset + (Rel->r_offset - SecShdr->sh_addr);

        if (mEhdr->e_machine == EM_X86_64) {
          switch (ELF_R_TYPE(Rel->r_info)) {
          case R_X86_64_NONE:
            break;
          case R_X86_64_64:
            //
            // Absolute relocation.
            //
            VerboseMsg ("R_X86_64_64");
            VerboseMsg ("Offset: 0x%08X, Addend: 0x%016LX", 
              (UINT32)(SecOffset + (Rel->r_offset - SecShdr->sh_addr)), 
              *(UINT64 *)Targ);
            *(UINT64 *)Targ = *(UINT64 *)Targ - SymShdr->sh_addr + mCoffSectionsOffset[Sym->st_shndx];
            VerboseMsg ("Relocation:  0x%016LX", *(UINT64*)Targ);
            break;
          case R_X86_64_32:
            VerboseMsg ("R_X86_64_32");
            VerboseMsg ("Offset: 0x%08X, Addend: 0x%08X", 
              (UINT32)(SecOffset + (Rel->r_offset - SecShdr->sh_addr)), 
              *(UINT32 *)Targ);
            *(UINT32 *)Targ = (UINT32)((UINT64)(*(UINT32 *)Targ) - SymShdr->sh_addr + mCoffSectionsOffset[Sym->st_shndx]);
            VerboseMsg ("Relocation:  0x%08X", *(UINT32*)Targ);
            break;
          case R_X86_64_32S:
            VerboseMsg ("R_X86_64_32S");
            VerboseMsg ("Offset: 0x%08X, Addend: 0x%08X", 
              (UINT32)(SecOffset + (Rel->r_offset - SecShdr->sh_addr)), 
              *(UINT32 *)Targ);
            *(INT32 *)Targ = (INT32)((INT64)(*(INT32 *)Targ) - SymShdr->sh_addr + mCoffSectionsOffset[Sym->st_shndx]);
            VerboseMsg ("Relocation:  0x%08X", *(UINT32*)Targ);
            break;
          case R_X86_64_PC32:
            //
            // Relative relocation: Symbol - Ip + Addend
            //
            VerboseMsg ("R_X86_64_PC32");
            VerboseMsg ("Offset: 0x%08X, Addend: 0x%08X", 
              (UINT32)(SecOffset + (Rel->r_offset - SecShdr->sh_addr)), 
              *(UINT32 *)Targ);
            *(UINT32 *)Targ = (UINT32) (*(UINT32 *)Targ
              + (mCoffSectionsOffset[Sym->st_shndx] - SymShdr->sh_addr)
              - (SecOffset - SecShdr->sh_addr));
            VerboseMsg ("Relocation:  0x%08X", *(UINT32 *)Targ);
            break;
          default:
            Error (NULL, 0, 3000, "Invalid", "%s unsupported ELF EM_X86_64 relocation 0x%x.", mInImageName, (unsigned) ELF_R_TYPE(Rel->r_info));
          }
        } else {
          Error (NULL, 0, 3000, "Invalid", "Not EM_X86_X64");
        }
      }
    }
  }

  return TRUE;
}

STATIC
VOID
WriteRelocations64 (
  VOID
  )
{
  UINT32                           Index;
  EFI_IMAGE_OPTIONAL_HEADER_UNION  *NtHdr;
  EFI_IMAGE_DATA_DIRECTORY         *Dir;
  BOOLEAN                          FoundRelocations;
  Elf_Sym                          *Sym;
  Elf_Shdr                         *SymtabShdr;
  UINT8                            *Symtab;


  for (Index = 0, FoundRelocations = FALSE; Index < mEhdr->e_shnum; Index++) {
    Elf_Shdr *RelShdr = GetShdrByIndex(Index);
    if ((RelShdr->sh_type == SHT_REL) || (RelShdr->sh_type == SHT_RELA)) {
      Elf_Shdr *SecShdr = GetShdrByIndex (RelShdr->sh_info);
      if (IsTextShdr(SecShdr) || IsDataShdr(SecShdr)) {
        UINT64 RelIdx;

        SymtabShdr = GetShdrByIndex (RelShdr->sh_link);
        Symtab = (UINT8*)mEhdr + SymtabShdr->sh_offset;
        FoundRelocations = TRUE;
        for (RelIdx = 0; RelIdx < RelShdr->sh_size; RelIdx += RelShdr->sh_entsize) {
          Elf_Rela *Rel = (Elf_Rela *)((UINT8*)mEhdr + RelShdr->sh_offset + RelIdx);
          Elf_Shdr *SymShdr;

          Sym = (Elf_Sym *)(Symtab + ELF_R_SYM(Rel->r_info) * SymtabShdr->sh_entsize);
          SymShdr = GetShdrByIndex (Sym->st_shndx);

          if (mEhdr->e_machine == EM_X86_64) {
            switch (ELF_R_TYPE(Rel->r_info)) {
            case R_X86_64_NONE:
            case R_X86_64_PC32:
              break;
            case R_X86_64_64:
              VerboseMsg ("EFI_IMAGE_REL_BASED_DIR64 Offset: 0x%08X", 
                mCoffSectionsOffset[RelShdr->sh_info] + (Rel->r_offset - SecShdr->sh_addr));
              CoffAddFixup(
                (UINT32) ((UINT64) mCoffSectionsOffset[RelShdr->sh_info]
                + (Rel->r_offset - SecShdr->sh_addr)),
                EFI_IMAGE_REL_BASED_DIR64);
              break;
            case R_X86_64_32S:
            case R_X86_64_32:
              VerboseMsg ("EFI_IMAGE_REL_BASED_HIGHLOW Offset: 0x%08X", 
                mCoffSectionsOffset[RelShdr->sh_info] + (Rel->r_offset - SecShdr->sh_addr));
              CoffAddFixup(
                (UINT32) ((UINT64) mCoffSectionsOffset[RelShdr->sh_info]
                + (Rel->r_offset - SecShdr->sh_addr)),
                EFI_IMAGE_REL_BASED_HIGHLOW);
              break;
            default:
              Error (NULL, 0, 3000, "Invalid", "%s unsupported ELF EM_X86_64 relocation 0x%x.", mInImageName, (unsigned) ELF_R_TYPE(Rel->r_info));
            }
          } else {
            Error (NULL, 0, 3000, "Not Supported", "This tool does not support relocations for ELF with e_machine %u (processor type).", (unsigned) mEhdr->e_machine);
          }
        }
      }
    }
  }

  //
  // Pad by adding empty entries.
  //
  while (mCoffOffset & (mCoffAlignment - 1)) {
    CoffAddFixupEntry(0);
  }

  NtHdr = (EFI_IMAGE_OPTIONAL_HEADER_UNION *)(mCoffFile + mNtHdrOffset);
  Dir = &NtHdr->Pe32Plus.OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_BASERELOC];
  Dir->Size = mCoffOffset - mRelocOffset;
  if (Dir->Size == 0) {
    // If no relocations, null out the directory entry and don't add the .reloc section
    Dir->VirtualAddress = 0;
    NtHdr->Pe32Plus.FileHeader.NumberOfSections--;
  } else {
    Dir->VirtualAddress = mRelocOffset;
    CreateSectionHeader (".reloc", mRelocOffset, mCoffOffset - mRelocOffset,
            EFI_IMAGE_SCN_CNT_INITIALIZED_DATA
            | EFI_IMAGE_SCN_MEM_DISCARDABLE
            | EFI_IMAGE_SCN_MEM_READ);
  }
}

STATIC
VOID
WriteDebug64 (
  VOID
  )
{
  UINT32                              Len;
  UINT32                              DebugOffset;
  EFI_IMAGE_OPTIONAL_HEADER_UNION     *NtHdr;
  EFI_IMAGE_DATA_DIRECTORY            *DataDir;
  EFI_IMAGE_DEBUG_DIRECTORY_ENTRY     *Dir;
  EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY *Nb10;

  Len = strlen(mInImageName) + 1;
  DebugOffset = mCoffOffset;

  mCoffOffset += sizeof(EFI_IMAGE_DEBUG_DIRECTORY_ENTRY)
    + sizeof(EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY)
    + Len;
  mCoffOffset = CoffAlign(mCoffOffset);

  mCoffFile = realloc(mCoffFile, mCoffOffset);
  memset(mCoffFile + DebugOffset, 0, mCoffOffset - DebugOffset);

  Dir = (EFI_IMAGE_DEBUG_DIRECTORY_ENTRY*)(mCoffFile + DebugOffset);
  Dir->Type = EFI_IMAGE_DEBUG_TYPE_CODEVIEW;
  Dir->SizeOfData = sizeof(EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY) + Len;
  Dir->RVA = DebugOffset + sizeof(EFI_IMAGE_DEBUG_DIRECTORY_ENTRY);
  Dir->FileOffset = DebugOffset + sizeof(EFI_IMAGE_DEBUG_DIRECTORY_ENTRY);

  Nb10 = (EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY*)(Dir + 1);
  Nb10->Signature = CODEVIEW_SIGNATURE_NB10;
  strcpy ((char *)(Nb10 + 1), mInImageName);


  NtHdr = (EFI_IMAGE_OPTIONAL_HEADER_UNION *)(mCoffFile + mNtHdrOffset);
  DataDir = &NtHdr->Pe32Plus.OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_DEBUG];
  DataDir->VirtualAddress = DebugOffset;
  DataDir->Size = mCoffOffset - DebugOffset;
  if (DataDir->Size == 0) {
    // If no debug, null out the directory entry and don't add the .debug section
    DataDir->VirtualAddress = 0;
    NtHdr->Pe32Plus.FileHeader.NumberOfSections--;
  } else {
    DataDir->VirtualAddress = DebugOffset;
    CreateSectionHeader (".debug", DebugOffset, mCoffOffset - DebugOffset,
            EFI_IMAGE_SCN_CNT_INITIALIZED_DATA
            | EFI_IMAGE_SCN_MEM_DISCARDABLE
            | EFI_IMAGE_SCN_MEM_READ);

  }
}

STATIC
VOID
SetImageSize64 (
  VOID
  )
{
  EFI_IMAGE_OPTIONAL_HEADER_UNION *NtHdr;

  //
  // Set image size
  //
  NtHdr = (EFI_IMAGE_OPTIONAL_HEADER_UNION *)(mCoffFile + mNtHdrOffset);
  NtHdr->Pe32Plus.OptionalHeader.SizeOfImage = mCoffOffset;
}

STATIC
VOID
CleanUp64 (
  VOID
  )
{
  if (mCoffSectionsOffset != NULL) {
    free (mCoffSectionsOffset);
  }
}