[PowerPC] Add secure plt support for TLS symbols
This patch supports secure plt mode for TLS symbols.
Differential Revision: https://reviews.llvm.org/D45520
llvm-svn: 355513
diff --git a/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp b/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
index f4ef95c..a8d4303 100644
--- a/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
+++ b/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
@@ -472,8 +472,14 @@
if (!Subtarget->isPPC64() && !Subtarget->isDarwin() &&
isPositionIndependent())
Kind = MCSymbolRefExpr::VK_PLT;
- const MCSymbolRefExpr *TlsRef =
+ const MCExpr *TlsRef =
MCSymbolRefExpr::create(TlsGetAddr, Kind, OutContext);
+
+ // Add 32768 offset to the symbol so we follow up the latest GOT/PLT ABI.
+ if (Kind == MCSymbolRefExpr::VK_PLT && Subtarget->isSecurePlt())
+ TlsRef = MCBinaryExpr::createAdd(TlsRef,
+ MCConstantExpr::create(32768, OutContext),
+ OutContext);
const MachineOperand &MO = MI->getOperand(2);
const GlobalValue *GValue = MO.getGlobal();
MCSymbol *MOSymbol = getSymbol(GValue);