206 lines
7.0 KiB
C++
206 lines
7.0 KiB
C++
//===- lib/ReaderWriter/ELF/HeaderChunks.cpp ------------------------------===//
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//
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// The LLVM Linker
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "HeaderChunks.h"
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#include "TargetLayout.h"
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#include "llvm/ADT/STLExtras.h"
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namespace lld {
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namespace elf {
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template <class ELFT> void ELFHeader<ELFT>::finalize() {
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_eh.e_ident[llvm::ELF::EI_CLASS] =
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(ELFT::Is64Bits) ? llvm::ELF::ELFCLASS64 : llvm::ELF::ELFCLASS32;
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_eh.e_ident[llvm::ELF::EI_DATA] =
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(ELFT::TargetEndianness == llvm::support::little)
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? llvm::ELF::ELFDATA2LSB
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: llvm::ELF::ELFDATA2MSB;
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_eh.e_type = this->_ctx.getOutputELFType();
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_eh.e_machine = this->_ctx.getOutputMachine();
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}
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template <class ELFT>
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ELFHeader<ELFT>::ELFHeader(const ELFLinkingContext &ctx)
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: Chunk<ELFT>("elfhdr", Chunk<ELFT>::Kind::ELFHeader, ctx) {
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this->_alignment = ELFT::Is64Bits ? 8 : 4;
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this->_fsize = sizeof(Elf_Ehdr);
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this->_msize = sizeof(Elf_Ehdr);
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memset(_eh.e_ident, 0, llvm::ELF::EI_NIDENT);
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e_ident(llvm::ELF::EI_MAG0, 0x7f);
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e_ident(llvm::ELF::EI_MAG1, 'E');
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e_ident(llvm::ELF::EI_MAG2, 'L');
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e_ident(llvm::ELF::EI_MAG3, 'F');
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e_ehsize(sizeof(Elf_Ehdr));
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e_flags(0);
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}
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template <class ELFT>
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void ELFHeader<ELFT>::write(ELFWriter *writer, TargetLayout<ELFT> &layout,
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llvm::FileOutputBuffer &buffer) {
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uint8_t *chunkBuffer = buffer.getBufferStart();
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uint8_t *atomContent = chunkBuffer + this->fileOffset();
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memcpy(atomContent, &_eh, fileSize());
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}
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template <class ELFT>
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bool ProgramHeader<ELFT>::addSegment(Segment<ELFT> *segment) {
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bool allocatedNew = false;
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ELFLinkingContext::OutputMagic outputMagic = this->_ctx.getOutputMagic();
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// For segments that are not a loadable segment, we
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// just pick the values directly from the segment as there
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// wouldnt be any slices within that
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if (segment->segmentType() != llvm::ELF::PT_LOAD) {
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Elf_Phdr *phdr = allocateProgramHeader(allocatedNew);
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phdr->p_type = segment->segmentType();
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phdr->p_offset = segment->fileOffset();
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phdr->p_vaddr = segment->virtualAddr();
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phdr->p_paddr = segment->virtualAddr();
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phdr->p_filesz = segment->fileSize();
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phdr->p_memsz = segment->memSize();
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phdr->p_flags = segment->flags();
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phdr->p_align = segment->alignment();
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this->_fsize = fileSize();
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this->_msize = this->_fsize;
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return allocatedNew;
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}
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// For all other segments, use the slice
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// to derive program headers
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for (auto slice : segment->slices()) {
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Elf_Phdr *phdr = allocateProgramHeader(allocatedNew);
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phdr->p_type = segment->segmentType();
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phdr->p_offset = slice->fileOffset();
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phdr->p_vaddr = slice->virtualAddr();
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phdr->p_paddr = slice->virtualAddr();
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phdr->p_filesz = slice->fileSize();
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phdr->p_memsz = slice->memSize();
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phdr->p_flags = segment->flags();
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phdr->p_align = slice->alignment();
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uint64_t segPageSize = segment->pageSize();
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uint64_t sliceAlign = slice->alignment();
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// Alignment of PT_LOAD segments are set to the page size, but if the
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// alignment of the slice is greater than the page size, set the alignment
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// of the segment appropriately.
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if (outputMagic != ELFLinkingContext::OutputMagic::NMAGIC &&
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outputMagic != ELFLinkingContext::OutputMagic::OMAGIC) {
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phdr->p_align =
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(phdr->p_type == llvm::ELF::PT_LOAD)
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? (segPageSize < sliceAlign) ? sliceAlign : segPageSize
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: sliceAlign;
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} else
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phdr->p_align = slice->alignment();
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}
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this->_fsize = fileSize();
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this->_msize = this->_fsize;
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return allocatedNew;
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}
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template <class ELFT>
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void ProgramHeader<ELFT>::write(ELFWriter *writer, TargetLayout<ELFT> &layout,
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llvm::FileOutputBuffer &buffer) {
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uint8_t *chunkBuffer = buffer.getBufferStart();
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uint8_t *dest = chunkBuffer + this->fileOffset();
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for (auto phi : _ph) {
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memcpy(dest, phi, sizeof(Elf_Phdr));
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dest += sizeof(Elf_Phdr);
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}
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}
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template <class ELFT>
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typename ProgramHeader<ELFT>::Elf_Phdr *
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ProgramHeader<ELFT>::allocateProgramHeader(bool &allocatedNew) {
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Elf_Phdr *phdr;
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if (_phi == _ph.end()) {
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phdr = new (_allocator) Elf_Phdr;
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_ph.push_back(phdr);
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_phi = _ph.end();
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allocatedNew = true;
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} else {
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phdr = (*_phi);
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++_phi;
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}
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return phdr;
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}
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template <class ELFT>
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SectionHeader<ELFT>::SectionHeader(const ELFLinkingContext &ctx, int32_t order)
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: Chunk<ELFT>("shdr", Chunk<ELFT>::Kind::SectionHeader, ctx) {
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this->_fsize = 0;
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this->_alignment = 8;
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this->setOrder(order);
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// The first element in the list is always NULL
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Elf_Shdr *nullshdr = new (_sectionAllocate.Allocate<Elf_Shdr>()) Elf_Shdr;
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::memset(nullshdr, 0, sizeof(Elf_Shdr));
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_sectionInfo.push_back(nullshdr);
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this->_fsize += sizeof(Elf_Shdr);
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}
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template <class ELFT>
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void SectionHeader<ELFT>::appendSection(OutputSection<ELFT> *section) {
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Elf_Shdr *shdr = new (_sectionAllocate.Allocate<Elf_Shdr>()) Elf_Shdr;
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shdr->sh_name = _stringSection->addString(section->name());
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shdr->sh_type = section->type();
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shdr->sh_flags = section->flags();
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shdr->sh_offset = section->fileOffset();
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shdr->sh_addr = section->virtualAddr();
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if (section->isLoadableSection())
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shdr->sh_size = section->memSize();
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else
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shdr->sh_size = section->fileSize();
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shdr->sh_link = section->link();
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shdr->sh_info = section->shinfo();
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shdr->sh_addralign = section->alignment();
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shdr->sh_entsize = section->entsize();
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_sectionInfo.push_back(shdr);
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}
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template <class ELFT>
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void SectionHeader<ELFT>::updateSection(Section<ELFT> *section) {
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Elf_Shdr *shdr = _sectionInfo[section->ordinal()];
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shdr->sh_type = section->getType();
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shdr->sh_flags = section->getFlags();
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shdr->sh_offset = section->fileOffset();
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shdr->sh_addr = section->virtualAddr();
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shdr->sh_size = section->fileSize();
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shdr->sh_link = section->getLink();
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shdr->sh_info = section->getInfo();
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shdr->sh_addralign = section->alignment();
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shdr->sh_entsize = section->getEntSize();
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}
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template <class ELFT>
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void SectionHeader<ELFT>::write(ELFWriter *writer, TargetLayout<ELFT> &layout,
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llvm::FileOutputBuffer &buffer) {
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uint8_t *chunkBuffer = buffer.getBufferStart();
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uint8_t *dest = chunkBuffer + this->fileOffset();
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for (auto shi : _sectionInfo) {
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memcpy(dest, shi, sizeof(Elf_Shdr));
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dest += sizeof(Elf_Shdr);
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}
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_stringSection->write(writer, layout, buffer);
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}
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template class ELFHeader<ELF32LE>;
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template class ELFHeader<ELF32BE>;
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template class ELFHeader<ELF64LE>;
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template class ELFHeader<ELF64BE>;
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template class ProgramHeader<ELF32LE>;
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template class ProgramHeader<ELF32BE>;
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template class ProgramHeader<ELF64LE>;
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template class ProgramHeader<ELF64BE>;
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template class SectionHeader<ELF32LE>;
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template class SectionHeader<ELF32BE>;
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template class SectionHeader<ELF64LE>;
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template class SectionHeader<ELF64BE>;
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} // end namespace elf
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} // end namespace lld
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