TEST_F( ELFReaderTest, read_symbol_and_rela )
{
ASSERT_TRUE(m_pInput->hasMemArea());
ASSERT_TRUE(m_pInput->hasContext());
m_pInput->setType(Input::Object);
// -- read symbols
LDSection* symtab_shdr = m_pInput->context()->getSection(".symtab");
ASSERT_TRUE(NULL!=symtab_shdr);
LDSection* strtab_shdr = symtab_shdr->getLink();
ASSERT_TRUE(NULL!=strtab_shdr);
MemoryRegion* symtab_region = m_pInput->memArea()->request(
m_pInput->fileOffset() + symtab_shdr->offset(),
symtab_shdr->size());
MemoryRegion* strtab_region = m_pInput->memArea()->request(
m_pInput->fileOffset() + strtab_shdr->offset(),
strtab_shdr->size());
char* strtab = reinterpret_cast<char*>(strtab_region->start());
bool result = m_pELFReader->readSymbols(*m_pInput, *m_pIRBuilder,
*symtab_region, strtab);
ASSERT_TRUE(result);
ASSERT_EQ("hello.c", std::string(m_pInput->context()->getSymbol(1)->name()));
ASSERT_EQ("puts", std::string(m_pInput->context()->getSymbol(10)->name()));
ASSERT_TRUE(NULL==m_pInput->context()->getSymbol(11));
m_pInput->memArea()->release(symtab_region);
m_pInput->memArea()->release(strtab_region);
// -- read relocations
MemoryArea* mem = m_pInput->memArea();
LDContext::sect_iterator rs = m_pInput->context()->relocSectBegin();
ASSERT_TRUE(rs!=m_pInput->context()->relocSectEnd());
ASSERT_EQ(".rela.text", (*rs)->name());
uint64_t offset = m_pInput->fileOffset() + (*rs)->offset();
uint64_t size = (*rs)->size();
MemoryRegion* region = mem->request(offset, size);
IRBuilder::CreateRelocData(**rs); /// create relocation data for the header
ASSERT_EQ(llvm::ELF::SHT_RELA, (*rs)->type());
ASSERT_TRUE(m_pELFReader->readRela(*m_pInput, **rs, *region));
mem->release(region);
const RelocData::RelocationListType &rRelocs =
(*rs)->getRelocData()->getRelocationList();
RelocData::const_iterator rReloc = rRelocs.begin();
ASSERT_EQ(2, rRelocs.size());
ASSERT_TRUE(rRelocs.end()!=rReloc);
++rReloc; /// test rRelocs[1]
ASSERT_EQ("puts", std::string(rReloc->symInfo()->name()));
ASSERT_EQ(llvm::ELF::R_X86_64_PC32, rReloc->type());
ASSERT_EQ(0x0, rReloc->symValue());
ASSERT_EQ(-0x4, rReloc->addend());
}
void EhFrameHdr::emitOutput<32>(MemoryArea& pOutput)
{
MemoryRegion* ehframehdr_region =
pOutput.request(m_EhFrameHdr.offset(), m_EhFrameHdr.size());
MemoryRegion* ehframe_region =
pOutput.request(m_EhFrame.offset(),
m_EhFrame.size());
uint8_t* data = (uint8_t*)ehframehdr_region->start();
// version
data[0] = 1;
// eh_frame_ptr_enc
data[1] = DW_EH_PE_pcrel | DW_EH_PE_sdata4;
// eh_frame_ptr
uint32_t* eh_frame_ptr = (uint32_t*)(data + 4);
*eh_frame_ptr = m_EhFrame.addr() - (m_EhFrameHdr.addr() + 4);
// fde_count
uint32_t* fde_count = (uint32_t*)(data + 8);
if (m_EhFrame.hasEhFrame())
*fde_count = 0;
else
*fde_count = m_EhFrame.getEhFrame()->numOfFDEs();
if (0 != *fde_count) {
// fde_count_enc
data[2] = DW_EH_PE_udata4;
// table_enc
data[3] = DW_EH_PE_datarel | DW_EH_PE_sdata4;
}
else {
// fde_count_enc
data[2] = DW_EH_PE_omit;
// table_enc
data[3] = DW_EH_PE_omit;
}
if (0 != *fde_count) {
// prepare the binary search table
typedef std::vector<bit32::Entry> SearchTableType;
SearchTableType search_table;
MemoryRegion* ehframe_region =
pOutput.request(m_EhFrame.offset(), m_EhFrame.size());
EhFrame::const_fde_iterator fde, fde_end = m_EhFrame.getEhFrame()->fde_end();
for(fde = m_EhFrame.getEhFrame()->fde_begin(); fde != fde_end; ++fde) {
assert(*fde != NULL);
SizeTraits<32>::Offset offset;
SizeTraits<32>::Address fde_pc;
SizeTraits<32>::Address fde_addr;
offset = (*fde)->getOffset();
fde_pc = computePCBegin(**fde, *ehframe_region);
fde_addr = m_EhFrame.addr() + offset;
search_table.push_back(std::make_pair(fde_pc, fde_addr));
}
pOutput.release(ehframe_region);
std::sort(search_table.begin(), search_table.end(), bit32::EntryCompare);
// write out the binary search table
uint32_t* bst = (uint32_t*)(data + 12);
SearchTableType::const_iterator entry, entry_end = search_table.end();
size_t id = 0;
for (entry = search_table.begin(); entry != entry_end; ++entry) {
bst[id++] = (*entry).first - m_EhFrameHdr.addr();
bst[id++] = (*entry).second - m_EhFrameHdr.addr();
}
}
pOutput.release(ehframehdr_region);
pOutput.release(ehframe_region);
}