[PowerPC] Fix PR 21652 - copy st_other bits on symbol assignment
When processing an assignment in the integrated assembler that sets
a symbol to the value of another symbol, we need to copy the st_other
bits that encode the local entry point offset.
Modeled after MipsTargetELFStreamer::emitAssignment handling of the
ELF::STO_MIPS_MICROMIPS flag.
llvm-svn: 222672
diff --git a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp
index 00be8f4..f2da389 100644
--- a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp
+++ b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp
@@ -184,6 +184,23 @@
if ((Flags & ELF::EF_PPC64_ABI) == 0)
MCA.setELFHeaderEFlags(Flags | 2);
}
+ void emitAssignment(MCSymbol *Symbol, const MCExpr *Value) override {
+ // When encoding an assignment to set symbol A to symbol B, also copy
+ // the st_other bits encoding the local entry point offset.
+ if (Value->getKind() != MCExpr::SymbolRef)
+ return;
+ const MCSymbol &RhsSym =
+ static_cast<const MCSymbolRefExpr *>(Value)->getSymbol();
+ MCSymbolData &Data = getStreamer().getOrCreateSymbolData(&RhsSym);
+ MCSymbolData &SymbolData = getStreamer().getOrCreateSymbolData(Symbol);
+ // The "other" values are stored in the last 6 bits of the second byte.
+ // The traditional defines for STO values assume the full byte and thus
+ // the shift to pack it.
+ unsigned Other = MCELF::getOther(SymbolData) << 2;
+ Other &= ~ELF::STO_PPC64_LOCAL_MASK;
+ Other |= (MCELF::getOther(Data) << 2) & ELF::STO_PPC64_LOCAL_MASK;
+ MCELF::setOther(SymbolData, Other >> 2);
+ }
};
class PPCTargetMachOStreamer : public PPCTargetStreamer {