diff options
author | Andras Becsi <andras.becsi@digia.com> | 2014-03-18 13:16:26 +0100 |
---|---|---|
committer | Frederik Gladhorn <frederik.gladhorn@digia.com> | 2014-03-20 15:55:39 +0100 |
commit | 3f0f86b0caed75241fa71c95a5d73bc0164348c5 (patch) | |
tree | 92b9fb00f2e9e90b0be2262093876d4f43b6cd13 /chromium/chrome_elf/ntdll_cache.cc | |
parent | e90d7c4b152c56919d963987e2503f9909a666d2 (diff) | |
download | qtwebengine-chromium-3f0f86b0caed75241fa71c95a5d73bc0164348c5.tar.gz |
Update to new stable branch 1750
This also includes an updated ninja and chromium dependencies
needed on Windows.
Change-Id: Icd597d80ed3fa4425933c9f1334c3c2e31291c42
Reviewed-by: Zoltan Arvai <zarvai@inf.u-szeged.hu>
Reviewed-by: Zeno Albisser <zeno.albisser@digia.com>
Diffstat (limited to 'chromium/chrome_elf/ntdll_cache.cc')
-rw-r--r-- | chromium/chrome_elf/ntdll_cache.cc | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/chromium/chrome_elf/ntdll_cache.cc b/chromium/chrome_elf/ntdll_cache.cc new file mode 100644 index 00000000000..e5504421ae4 --- /dev/null +++ b/chromium/chrome_elf/ntdll_cache.cc @@ -0,0 +1,51 @@ +// 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 <stdint.h> +#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(uint32_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; + } +} |