[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/PPCISelDAGToDAG.cpp b/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
index 08a5003..196a98a 100644
--- a/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
@@ -4353,7 +4353,20 @@
if (trySETCC(N))
return;
break;
-
+ // These nodes will be transformed into GETtlsADDR32 node, which
+ // later becomes BL_TLS __tls_get_addr(sym at tlsgd)@PLT
+ case PPCISD::ADDI_TLSLD_L_ADDR:
+ case PPCISD::ADDI_TLSGD_L_ADDR: {
+ const Module *Mod = MF->getFunction().getParent();
+ if (PPCLowering->getPointerTy(CurDAG->getDataLayout()) != MVT::i32 ||
+ !PPCSubTarget->isSecurePlt() || !PPCSubTarget->isTargetELF() ||
+ Mod->getPICLevel() == PICLevel::SmallPIC)
+ break;
+ // Attach global base pointer on GETtlsADDR32 node in order to
+ // generate secure plt code for TLS symbols.
+ getGlobalBaseReg();
+ }
+ break;
case PPCISD::CALL: {
const Module *M = MF->getFunction().getParent();