if (TT.isOSBinFormatCOFF()) {
// Emit an absolute @feat.00 symbol. This appears to be some kind of
// compiler features bitfield read by link.exe.
+ MCSymbol *S = MMI->getContext().getOrCreateSymbol(StringRef("@feat.00"));
+ OutStreamer->BeginCOFFSymbolDef(S);
+ OutStreamer->EmitCOFFSymbolStorageClass(COFF::IMAGE_SYM_CLASS_STATIC);
+ OutStreamer->EmitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_NULL);
+ OutStreamer->EndCOFFSymbolDef();
+ int64_t Feat00Flags = 0;
+
if (TT.getArch() == Triple::x86) {
- MCSymbol *S = MMI->getContext().getOrCreateSymbol(StringRef("@feat.00"));
- OutStreamer->BeginCOFFSymbolDef(S);
- OutStreamer->EmitCOFFSymbolStorageClass(COFF::IMAGE_SYM_CLASS_STATIC);
- OutStreamer->EmitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_NULL);
- OutStreamer->EndCOFFSymbolDef();
// According to the PE-COFF spec, the LSB of this value marks the object
// for "registered SEH". This means that all SEH handler entry points
// must be registered in .sxdata. Use of any unregistered handlers will
// cause the process to terminate immediately. LLVM does not know how to
// register any SEH handlers, so its object files should be safe.
- OutStreamer->EmitSymbolAttribute(S, MCSA_Global);
- OutStreamer->EmitAssignment(
- S, MCConstantExpr::create(int64_t(1), MMI->getContext()));
+ Feat00Flags |= 1;
}
+
+ if (M.getModuleFlag("cfguardtable"))
+ Feat00Flags |= 0x800; // Object is CFG-aware.
+
+ OutStreamer->EmitSymbolAttribute(S, MCSA_Global);
+ OutStreamer->EmitAssignment(
+ S, MCConstantExpr::create(Feat00Flags, MMI->getContext()));
}
OutStreamer->EmitSyntaxDirective();