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llvm-svn: 282807
This commit is contained in:
Rui Ueyama 2016-09-29 23:04:50 +00:00
parent 2d68f8ade4
commit e364d1f431
1 changed files with 10 additions and 7 deletions
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17
lld/ELF/InputFiles.cpp
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@ -720,9 +720,10 @@ static InputFile *createELFFile(MemoryBufferRef MB) {
return Obj;
}
// Wraps a binary blob with an ELF header and footer
// so that we can link it as a regular ELF file.
template <class ELFT> InputFile *BinaryFile::createELF() {
// Wrap the binary blob with an ELF header and footer
// so that we can link it as a regular ELF file.
// Fill the ELF file header.
ELFCreator<ELFT> ELF(ET_REL, Config->EMachine);
auto DataSec = ELF.addSection(".data");
DataSec.Header->sh_flags = SHF_ALLOC;
@ -730,33 +731,35 @@ template <class ELFT> InputFile *BinaryFile::createELF() {
DataSec.Header->sh_type = SHT_PROGBITS;
DataSec.Header->sh_addralign = 8;
// Replace non-alphanumeric characters with '_'.
std::string Filepath = MB.getBufferIdentifier();
std::transform(Filepath.begin(), Filepath.end(), Filepath.begin(),
[](char C) { return isalnum(C) ? C : '_'; });
std::string StartSym = "_binary_" + Filepath + "_start";
std::string EndSym = "_binary_" + Filepath + "_end";
std::string SizeSym = "_binary_" + Filepath + "_size";
// Add _start, _end and _size symbols.
std::string StartSym = "_binary_" + Filepath + "_start";
auto SSym = ELF.addSymbol(StartSym);
SSym.Sym->setBindingAndType(STB_GLOBAL, STT_OBJECT);
SSym.Sym->st_shndx = DataSec.Index;
std::string EndSym = "_binary_" + Filepath + "_end";
auto ESym = ELF.addSymbol(EndSym);
ESym.Sym->setBindingAndType(STB_GLOBAL, STT_OBJECT);
ESym.Sym->st_shndx = DataSec.Index;
ESym.Sym->st_value = MB.getBufferSize();
std::string SizeSym = "_binary_" + Filepath + "_size";
auto SZSym = ELF.addSymbol(SizeSym);
SZSym.Sym->setBindingAndType(STB_GLOBAL, STT_OBJECT);
SZSym.Sym->st_shndx = SHN_ABS;
SZSym.Sym->st_value = MB.getBufferSize();
// Fix the ELF file layout and write it down to ELFData uint8_t vector.
std::size_t Size = ELF.layout();
ELFData.resize(Size);
ELF.write(ELFData.data());
// .data
// Fill .data section with actual data.
std::copy(MB.getBufferStart(), MB.getBufferEnd(),
ELFData.data() + DataSec.Header->sh_offset);