Revert of Cache ntdll exports in ELF

chrome_elf/ntdll_cache.cc

-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include <windows.h>
-
-#include "chrome_elf/ntdll_cache.h"
-
-FunctionLookupTable g_ntdll_lookup;
-
-void InitCache() {
-  HMODULE ntdll_handle = ::GetModuleHandle(L"ntdll.dll");
-
-  // To find the Export Address Table address, we start from the DOS header.
-  // The module handle is actually the address of the header.
-  IMAGE_DOS_HEADER* dos_header =
-      reinterpret_cast<IMAGE_DOS_HEADER*>(ntdll_handle);
-  // The e_lfanew is an offset from the DOS header to the NT header. It should
-  // never be 0.
-  IMAGE_NT_HEADERS* nt_headers = reinterpret_cast<IMAGE_NT_HEADERS*>(
-      ntdll_handle + dos_header->e_lfanew / sizeof(uintptr_t));
-  // For modules that have an import address table, its offset from the
-  // DOS header is stored in the second data directory's VirtualAddress.
-  if (!nt_headers->OptionalHeader.DataDirectory[0].VirtualAddress)
-    return;
-
-  BYTE* base_addr = reinterpret_cast<BYTE*>(ntdll_handle);
-
-  IMAGE_DATA_DIRECTORY* exports_data_dir =
-      &nt_headers->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT];
-
-  IMAGE_EXPORT_DIRECTORY* exports = reinterpret_cast<IMAGE_EXPORT_DIRECTORY*>(
-      base_addr + exports_data_dir->VirtualAddress);
-
-  WORD* ordinals = reinterpret_cast<WORD*>(
-      base_addr + exports->AddressOfNameOrdinals);
-  DWORD* names = reinterpret_cast<DWORD*>(
-      base_addr + exports->AddressOfNames);
-  DWORD* funcs = reinterpret_cast<DWORD*>(
-      base_addr + exports->AddressOfFunctions);
-  int num_entries = exports->NumberOfNames;
-
-  for (int i = 0; i < num_entries; i++) {
-    char* name = reinterpret_cast<char*>(base_addr + names[i]);
-    WORD ord =  ordinals[i];
-    DWORD func = funcs[ord];
-    FARPROC func_addr = reinterpret_cast<FARPROC>(func + base_addr);
-    g_ntdll_lookup[std::string(name)] = func_addr;
-  }
-}