ELFObjectReader.cpp revision 22add6ff3426df1a85089fe6a6e1597ee3b6f300
15460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao//===- ELFObjectReader.cpp ------------------------------------------------===// 25460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// 35460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// The MCLinker Project 45460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// 55460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// This file is distributed under the University of Illinois Open Source 65460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// License. See LICENSE.TXT for details. 75460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// 85460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao//===----------------------------------------------------------------------===// 922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/LD/ELFObjectReader.h> 10cedee4b38f4786845183be7f5916dd520a170ae0Shih-wei Liao 11cedee4b38f4786845183be7f5916dd520a170ae0Shih-wei Liao#include <string> 12cedee4b38f4786845183be7f5916dd520a170ae0Shih-wei Liao#include <cassert> 13cedee4b38f4786845183be7f5916dd520a170ae0Shih-wei Liao 145460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao#include <llvm/Support/ELF.h> 155460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao#include <llvm/ADT/Twine.h> 16cedee4b38f4786845183be7f5916dd520a170ae0Shih-wei Liao 1722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/IRBuilder.h> 185460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao#include <mcld/MC/MCLDInput.h> 1922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/Fragment/FragmentLinker.h> 20cedee4b38f4786845183be7f5916dd520a170ae0Shih-wei Liao#include <mcld/LD/ELFReader.h> 2122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/LD/EhFrameReader.h> 2222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/LD/EhFrame.h> 235460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao#include <mcld/Target/GNULDBackend.h> 24affc150dc44fab1911775a49636d0ce85333b634Zonr Chang#include <mcld/Support/MsgHandling.h> 2522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao#include <mcld/Object/ObjectBuilder.h> 265460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 275460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liaousing namespace mcld; 285460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 2922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao//===----------------------------------------------------------------------===// 305460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// ELFObjectReader 3122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao//===----------------------------------------------------------------------===// 325460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao/// constructor 3322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei LiaoELFObjectReader::ELFObjectReader(GNULDBackend& pBackend, FragmentLinker& pLinker) 345460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao : ObjectReader(), 3522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_pELFReader(NULL), 3622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_pEhFrameReader(NULL), 3722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_Linker(pLinker), 3822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_ReadFlag(ParseEhFrame), 3922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_Backend(pBackend) { 405460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao if (32 == pBackend.bitclass() && pBackend.isLittleEndian()) { 415460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao m_pELFReader = new ELFReader<32, true>(pBackend); 425460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 4322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 4422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_pEhFrameReader = new EhFrameReader(); 455460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 465460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 475460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao/// destructor 485460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei LiaoELFObjectReader::~ELFObjectReader() 495460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao{ 505460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao delete m_pELFReader; 5122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao delete m_pEhFrameReader; 525460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 535460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 545460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao/// isMyFormat 555460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liaobool ELFObjectReader::isMyFormat(Input &pInput) const 565460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao{ 575460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao assert(pInput.hasMemArea()); 585460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 595460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // Don't warning about the frequently requests. 605460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // MemoryArea has a list of cache to handle this. 615460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao size_t hdr_size = m_pELFReader->getELFHeaderSize(); 6267e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao MemoryRegion* region = pInput.memArea()->request(pInput.fileOffset(), 6367e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao hdr_size); 645460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 655460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao uint8_t* ELF_hdr = region->start(); 665460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao bool result = true; 675460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao if (!m_pELFReader->isELF(ELF_hdr)) 685460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao result = false; 695460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao else if (!m_pELFReader->isMyEndian(ELF_hdr)) 705460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao result = false; 715460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao else if (!m_pELFReader->isMyMachine(ELF_hdr)) 725460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao result = false; 7322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao else if (Input::Object != m_pELFReader->fileType(ELF_hdr)) 745460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao result = false; 755460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao pInput.memArea()->release(region); 765460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao return result; 775460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 785460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 7922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// readHeader - read section header and create LDSections. 8022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liaobool ELFObjectReader::readHeader(Input& pInput) 815460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao{ 825460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao assert(pInput.hasMemArea()); 835460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 845460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao size_t hdr_size = m_pELFReader->getELFHeaderSize(); 8567e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao MemoryRegion* region = pInput.memArea()->request(pInput.fileOffset(), 8667e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao hdr_size); 875460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao uint8_t* ELF_hdr = region->start(); 8822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao bool result = m_pELFReader->readSectionHeaders(pInput, ELF_hdr); 895460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao pInput.memArea()->release(region); 905460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao return result; 915460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 925460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 935460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao/// readSections - read all regular sections. 945460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liaobool ELFObjectReader::readSections(Input& pInput) 955460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao{ 965460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // handle sections 975460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao LDContext::sect_iterator section, sectEnd = pInput.context()->sectEnd(); 985460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao for (section = pInput.context()->sectBegin(); section != sectEnd; ++section) { 995460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // ignore the section if the LDSection* in input context is NULL 1005460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao if (NULL == *section) 1015460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao continue; 1025460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 1035460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao switch((*section)->kind()) { 1045460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao /** group sections **/ 1055460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao case LDFileFormat::Group: { 1065460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao assert(NULL != (*section)->getLink()); 1075460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao ResolveInfo* signature = 10822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_pELFReader->readSignature(pInput, 10922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao *(*section)->getLink(), 11022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao (*section)->getInfo()); 1115460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 1125460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao bool exist = false; 11322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (0 == signature->nameSize() && 114affc150dc44fab1911775a49636d0ce85333b634Zonr Chang ResolveInfo::Section == signature->type()) { 115affc150dc44fab1911775a49636d0ce85333b634Zonr Chang // if the signature is a section symbol in input object, we use the 116affc150dc44fab1911775a49636d0ce85333b634Zonr Chang // section name as group signature. 117affc150dc44fab1911775a49636d0ce85333b634Zonr Chang signatures().insert((*section)->name(), exist); 118affc150dc44fab1911775a49636d0ce85333b634Zonr Chang } else { 119affc150dc44fab1911775a49636d0ce85333b634Zonr Chang signatures().insert(signature->name(), exist); 120affc150dc44fab1911775a49636d0ce85333b634Zonr Chang } 1215460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 1225460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao if (exist) { 1235460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // if this is not the first time we see this group signature, then 12422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // ignore all the members in this group (set Ignore) 12567e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao MemoryRegion* region = pInput.memArea()->request( 12667e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao pInput.fileOffset() + (*section)->offset(), (*section)->size()); 1275460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao llvm::ELF::Elf32_Word* value = 12867e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao reinterpret_cast<llvm::ELF::Elf32_Word*>(region->start()); 1295460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 1305460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao size_t size = region->size() / sizeof(llvm::ELF::Elf32_Word); 1315460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao if (llvm::ELF::GRP_COMDAT == *value) { 13222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao for (size_t index = 1; index < size; ++index) { 13322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao pInput.context()->getSection(value[index])->setKind(LDFileFormat::Ignore); 13422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 1355460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 1365460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao pInput.memArea()->release(region); 1375460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 13822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao ResolveInfo::Destroy(signature); 1395460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao break; 1405460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 1415460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao /** relocation sections **/ 1425460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao case LDFileFormat::Relocation: { 1435460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao assert(NULL != (*section)->getLink()); 1445460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao size_t link_index = (*section)->getLink()->index(); 14522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao LDSection* link_sect = pInput.context()->getSection(link_index); 14622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (NULL == link_sect || LDFileFormat::Ignore == link_sect->kind()) { 1475460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // Relocation sections of group members should also be part of the 1485460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // group. Thus, if the associated member sections are ignored, the 1495460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // related relocations should be also ignored. 15022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao (*section)->setKind(LDFileFormat::Ignore); 1515460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 1525460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao break; 1535460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 1545460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao /** normal sections **/ 15522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // FIXME: support Version Kind 1565460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao case LDFileFormat::Version: 15722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // FIXME: support GCCExceptTable Kind 15822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case LDFileFormat::GCCExceptTable: 1595460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao /** Fall through **/ 1605460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao case LDFileFormat::Regular: 1615460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao case LDFileFormat::Note: 1625460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao case LDFileFormat::MetaData: { 16322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao SectionData* sd = IRBuilder::CreateSectionData(**section); 16422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (!m_pELFReader->readRegularSection(pInput, *sd)) 165affc150dc44fab1911775a49636d0ce85333b634Zonr Chang fatal(diag::err_cannot_read_section) << (*section)->name(); 166affc150dc44fab1911775a49636d0ce85333b634Zonr Chang break; 167affc150dc44fab1911775a49636d0ce85333b634Zonr Chang } 16822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case LDFileFormat::Debug: { 16922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (m_Linker.getLDInfo().options().stripDebug()) { 17022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao (*section)->setKind(LDFileFormat::Ignore); 17122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 17222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao else { 17322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao SectionData* sd = IRBuilder::CreateSectionData(**section); 17422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (!m_pELFReader->readRegularSection(pInput, *sd)) { 17522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao fatal(diag::err_cannot_read_section) << (*section)->name(); 17622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 17722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 178affc150dc44fab1911775a49636d0ce85333b634Zonr Chang break; 179affc150dc44fab1911775a49636d0ce85333b634Zonr Chang } 18022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case LDFileFormat::EhFrame: { 18122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao EhFrame* eh_frame = IRBuilder::CreateEhFrame(**section); 18222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 18322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (m_Linker.getLDInfo().options().hasEhFrameHdr() && 18422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao (m_ReadFlag & ParseEhFrame)) { 18522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 18622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // if --eh-frame-hdr option is given, parse .eh_frame. 18722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (!m_pEhFrameReader->read<32, true>(pInput, *eh_frame)) { 18822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // if we failed to parse a .eh_frame, we should not parse the rest 18922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // .eh_frame. 19022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao m_ReadFlag ^= ParseEhFrame; 19122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 19222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 19322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao else { 19422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (!m_pELFReader->readRegularSection(pInput, 19522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao eh_frame->getSectionData())) { 19622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao fatal(diag::err_cannot_read_section) << (*section)->name(); 19722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 19822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 1995460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao break; 2005460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 2015460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao /** target dependent sections **/ 2025460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao case LDFileFormat::Target: { 20322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao SectionData* sd = IRBuilder::CreateSectionData(**section); 20422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (!m_Backend.readSection(pInput, *sd)) { 205affc150dc44fab1911775a49636d0ce85333b634Zonr Chang fatal(diag::err_cannot_read_target_section) << (*section)->name(); 20622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 2075460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao break; 2085460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 2095460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao /** BSS sections **/ 2105460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao case LDFileFormat::BSS: { 21122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao IRBuilder::CreateBSS(**section); 2125460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao break; 2135460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 2145460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // ignore 2155460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao case LDFileFormat::Null: 2165460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao case LDFileFormat::NamePool: 21722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case LDFileFormat::Ignore: 21822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case LDFileFormat::StackNote: 2195460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao continue; 220affc150dc44fab1911775a49636d0ce85333b634Zonr Chang // warning 221affc150dc44fab1911775a49636d0ce85333b634Zonr Chang case LDFileFormat::EhFrameHdr: 222affc150dc44fab1911775a49636d0ce85333b634Zonr Chang default: { 223affc150dc44fab1911775a49636d0ce85333b634Zonr Chang warning(diag::warn_illegal_input_section) << (*section)->name() 224affc150dc44fab1911775a49636d0ce85333b634Zonr Chang << pInput.name() 225affc150dc44fab1911775a49636d0ce85333b634Zonr Chang << pInput.path(); 226affc150dc44fab1911775a49636d0ce85333b634Zonr Chang break; 227affc150dc44fab1911775a49636d0ce85333b634Zonr Chang } 2285460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 2295460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } // end of for all sections 2305460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 2315460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao return true; 2325460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 2335460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 23422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao/// readSymbols - read symbols into FragmentLinker from the input relocatable object. 2355460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liaobool ELFObjectReader::readSymbols(Input& pInput) 2365460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao{ 2375460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao assert(pInput.hasMemArea()); 2385460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 2395460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao LDSection* symtab_shdr = pInput.context()->getSection(".symtab"); 240affc150dc44fab1911775a49636d0ce85333b634Zonr Chang if (NULL == symtab_shdr) { 241affc150dc44fab1911775a49636d0ce85333b634Zonr Chang note(diag::note_has_no_symtab) << pInput.name() 242affc150dc44fab1911775a49636d0ce85333b634Zonr Chang << pInput.path() 243affc150dc44fab1911775a49636d0ce85333b634Zonr Chang << ".symtab"; 244affc150dc44fab1911775a49636d0ce85333b634Zonr Chang return true; 245affc150dc44fab1911775a49636d0ce85333b634Zonr Chang } 246affc150dc44fab1911775a49636d0ce85333b634Zonr Chang 2475460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao LDSection* strtab_shdr = symtab_shdr->getLink(); 248affc150dc44fab1911775a49636d0ce85333b634Zonr Chang if (NULL == strtab_shdr) { 249affc150dc44fab1911775a49636d0ce85333b634Zonr Chang fatal(diag::fatal_cannot_read_strtab) << pInput.name() 250affc150dc44fab1911775a49636d0ce85333b634Zonr Chang << pInput.path() 251affc150dc44fab1911775a49636d0ce85333b634Zonr Chang << ".symtab"; 2525460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao return false; 253affc150dc44fab1911775a49636d0ce85333b634Zonr Chang } 2545460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 25567e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao MemoryRegion* symtab_region = pInput.memArea()->request( 25667e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao pInput.fileOffset() + symtab_shdr->offset(), symtab_shdr->size()); 25767e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao MemoryRegion* strtab_region = pInput.memArea()->request( 25867e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao pInput.fileOffset() + strtab_shdr->offset(), strtab_shdr->size()); 2595460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao char* strtab = reinterpret_cast<char*>(strtab_region->start()); 2605460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao bool result = m_pELFReader->readSymbols(pInput, 2615460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao m_Linker, 2625460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao *symtab_region, 2635460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao strtab); 2645460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao pInput.memArea()->release(symtab_region); 2655460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao pInput.memArea()->release(strtab_region); 2665460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao return result; 2675460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 2685460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 2695460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liaobool ELFObjectReader::readRelocations(Input& pInput) 2705460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao{ 2715460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao assert(pInput.hasMemArea()); 2725460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 2735460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao MemoryArea* mem = pInput.memArea(); 27422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao LDContext::sect_iterator rs, rsEnd = pInput.context()->relocSectEnd(); 27522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao for (rs = pInput.context()->relocSectBegin(); rs != rsEnd; ++rs) { 27622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (LDFileFormat::Ignore == (*rs)->kind()) 27722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao continue; 2785460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 27922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint32_t offset = pInput.fileOffset() + (*rs)->offset(); 28022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint32_t size = (*rs)->size(); 28122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao MemoryRegion* region = mem->request(offset, size); 28222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao IRBuilder::CreateRelocData(**rs); ///< create relocation data for the header 28322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao switch ((*rs)->type()) { 28422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case llvm::ELF::SHT_RELA: { 28522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (!m_pELFReader->readRela(pInput, m_Linker, **rs, *region)) { 28622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao mem->release(region); 28722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return false; 28822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 28922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao break; 29022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 29122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao case llvm::ELF::SHT_REL: { 29222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (!m_pELFReader->readRel(pInput, m_Linker, **rs, *region)) { 29322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao mem->release(region); 29422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return false; 29522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 29622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao break; 29722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 29822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao default: { ///< should not enter 29922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao mem->release(region); 3005460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao return false; 30122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 30222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } // end of switch 30322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 30422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao mem->release(region); 30522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } // end of for all relocation data 30622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 3075460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao return true; 3085460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 3095460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 310