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llvm-readobj: teach it how to dump COFF base relocation table

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222289 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rui Ueyama
2014-11-19 00:18:07 +00:00
parent f82e60f03d
commit 6272b8c4be
7 changed files with 168 additions and 2 deletions
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70
lib/Object/COFFObjectFile.cpp
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@@ -598,6 +598,23 @@ std::error_code COFFObjectFile::initExportTablePtr() {
return object_error::success;
}
std::error_code COFFObjectFile::initBaseRelocPtr() {
const data_directory *DataEntry;
if (getDataDirectory(COFF::BASE_RELOCATION_TABLE, DataEntry))
return object_error::success;
if (DataEntry->RelativeVirtualAddress == 0)
return object_error::success;
uintptr_t IntPtr = 0;
if (std::error_code EC = getRvaPtr(DataEntry->RelativeVirtualAddress, IntPtr))
return EC;
BaseRelocHeader = reinterpret_cast<const coff_base_reloc_block_header *>(
IntPtr);
BaseRelocEnd = reinterpret_cast<coff_base_reloc_block_header *>(
IntPtr + DataEntry->Size);
return object_error::success;
}
COFFObjectFile::COFFObjectFile(MemoryBufferRef Object, std::error_code &EC)
: ObjectFile(Binary::ID_COFF, Object), COFFHeader(nullptr),
COFFBigObjHeader(nullptr), PE32Header(nullptr), PE32PlusHeader(nullptr),
@@ -605,7 +622,8 @@ COFFObjectFile::COFFObjectFile(MemoryBufferRef Object, std::error_code &EC)
SymbolTable32(nullptr), StringTable(nullptr), StringTableSize(0),
ImportDirectory(nullptr), NumberOfImportDirectory(0),
DelayImportDirectory(nullptr), NumberOfDelayImportDirectory(0),
ExportDirectory(nullptr) {
ExportDirectory(nullptr), BaseRelocHeader(nullptr),
BaseRelocEnd(nullptr) {
// Check that we at least have enough room for a header.
if (!checkSize(Data, EC, sizeof(coff_file_header)))
return;
@@ -717,6 +735,10 @@ COFFObjectFile::COFFObjectFile(MemoryBufferRef Object, std::error_code &EC)
if ((EC = initExportTablePtr()))
return;
// Initialize the pointer to the base relocation table.
if ((EC = initBaseRelocPtr()))
return;
EC = object_error::success;
}
@@ -783,6 +805,14 @@ section_iterator COFFObjectFile::section_end() const {
return section_iterator(SectionRef(Ret, this));
}
base_reloc_iterator COFFObjectFile::base_reloc_begin() const {
return base_reloc_iterator(BaseRelocRef(BaseRelocHeader, this));
}
base_reloc_iterator COFFObjectFile::base_reloc_end() const {
return base_reloc_iterator(BaseRelocRef(BaseRelocEnd, this));
}
uint8_t COFFObjectFile::getBytesInAddress() const {
return getArch() == Triple::x86_64 ? 8 : 4;
}
@@ -829,6 +859,10 @@ COFFObjectFile::export_directories() const {
return make_range(export_directory_begin(), export_directory_end());
}
iterator_range<base_reloc_iterator> COFFObjectFile::base_relocs() const {
return make_range(base_reloc_begin(), base_reloc_end());
}
std::error_code COFFObjectFile::getPE32Header(const pe32_header *&Res) const {
Res = PE32Header;
return object_error::success;
@@ -1448,3 +1482,37 @@ ObjectFile::createCOFFObjectFile(MemoryBufferRef Object) {
return EC;
return std::move(Ret);
}
bool BaseRelocRef::operator==(const BaseRelocRef &Other) const {
return Header == Other.Header && Index == Other.Index;
}
void BaseRelocRef::moveNext() {
// Header->BlockSize is the size of the current block, including the
// size of the header itself.
uint32_t Size = sizeof(*Header) +
sizeof(coff_base_reloc_block_entry) * Index;
if (Size == Header->BlockSize) {
// .reloc contains a list of base relocation blocks. Each block
// consists of the header followed by entries. The header contains
// how many entories will follow. When we reach the end of the
// current block, proceed to the next block.
Header = reinterpret_cast<const coff_base_reloc_block_header *>(
reinterpret_cast<const uint8_t *>(Header) + Size);
Index = 0;
} else {
++Index;
}
}
std::error_code BaseRelocRef::getType(uint8_t &Type) const {
auto *Entry = reinterpret_cast<const coff_base_reloc_block_entry *>(Header + 1);
Type = Entry[Index].getType();
return object_error::success;
}
std::error_code BaseRelocRef::getRVA(uint32_t &Result) const {
auto *Entry = reinterpret_cast<const coff_base_reloc_block_entry *>(Header + 1);
Result = Header->PageRVA + Entry[Index].getOffset();
return object_error::success;
}