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Add support for the --noexecstack option.

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llvm-svn: 124077
This commit is contained in:
Rafael Espindola
2011-01-23 17:55:27 +00:00
parent 8f01420d9d
commit b3eca9bb71
14 changed files with 89 additions and 25 deletions
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30
llvm/lib/MC/ELFObjectWriter.cpp
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@@ -329,8 +329,11 @@ namespace {
virtual void CreateMetadataSections(MCAssembler &Asm, MCAsmLayout &Layout,
const SectionIndexMapTy &SectionIndexMap);
virtual void CreateGroupSections(MCAssembler &Asm, MCAsmLayout &Layout,
GroupMapTy &GroupMap, RevGroupMapTy &RevGroupMap);
// Create the sections that show up in the symbol table. Currently
// those are the .note.GNU-stack section and the group sections.
virtual void CreateIndexedSections(MCAssembler &Asm, MCAsmLayout &Layout,
GroupMapTy &GroupMap,
RevGroupMapTy &RevGroupMap);
virtual void ExecutePostLayoutBinding(MCAssembler &Asm,
const MCAsmLayout &Layout);
@@ -1174,10 +1177,19 @@ ELFObjectWriter::IsSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm,
return &SecA == &SecB;
}
void ELFObjectWriter::CreateGroupSections(MCAssembler &Asm,
MCAsmLayout &Layout,
GroupMapTy &GroupMap,
RevGroupMapTy &RevGroupMap) {
void ELFObjectWriter::CreateIndexedSections(MCAssembler &Asm,
MCAsmLayout &Layout,
GroupMapTy &GroupMap,
RevGroupMapTy &RevGroupMap) {
// Create the .note.GNU-stack section if needed.
MCContext &Ctx = Asm.getContext();
if (Asm.getNoExecStack()) {
const MCSectionELF *GnuStackSection =
Ctx.getELFSection(".note.GNU-stack", ELF::SHT_PROGBITS, 0,
SectionKind::getReadOnly());
Asm.getOrCreateSectionData(*GnuStackSection);
}
// Build the groups
for (MCAssembler::const_iterator it = Asm.begin(), ie = Asm.end();
it != ie; ++it) {
@@ -1190,7 +1202,7 @@ void ELFObjectWriter::CreateGroupSections(MCAssembler &Asm,
Asm.getOrCreateSymbolData(*SignatureSymbol);
const MCSectionELF *&Group = RevGroupMap[SignatureSymbol];
if (!Group) {
Group = Asm.getContext().CreateELFGroupSection();
Group = Ctx.CreateELFGroupSection();
MCSectionData &Data = Asm.getOrCreateSectionData(*Group);
Data.setAlignment(4);
MCDataFragment *F = new MCDataFragment(&Data);
@@ -1334,8 +1346,8 @@ void ELFObjectWriter::WriteObject(MCAssembler &Asm,
const MCAsmLayout &Layout) {
GroupMapTy GroupMap;
RevGroupMapTy RevGroupMap;
CreateGroupSections(Asm, const_cast<MCAsmLayout&>(Layout), GroupMap,
RevGroupMap);
CreateIndexedSections(Asm, const_cast<MCAsmLayout&>(Layout), GroupMap,
RevGroupMap);
SectionIndexMapTy SectionIndexMap;