[PowerPC] Option for secure plt mode

This patch enables option for secure plt mode in
clang (-msecure-plt).

Differential Revision: https://reviews.llvm.org/D44921

llvm-svn: 329795

2 files changed, 17 insertions, 0 deletions

diff --git a/clang/lib/Driver/ToolChains/Arch/PPC.cpp b/clang/lib/Driver/ToolChains/Arch/PPC.cpp
index 7c7e1c70e55..f6a95962ace 100644
--- a/clang/lib/Driver/ToolChains/Arch/PPC.cpp
+++ b/clang/lib/Driver/ToolChains/Arch/PPC.cpp
@@ -106,6 +106,16 @@ void ppc::getPPCTargetFeatures(const Driver &D, const llvm::Triple &Triple,
   ppc::FloatABI FloatABI = ppc::getPPCFloatABI(D, Args);
   if (FloatABI == ppc::FloatABI::Soft)
     Features.push_back("-hard-float");
+
+  ppc::ReadGOTPtrMode ReadGOT = ppc::getPPCReadGOTPtrMode(D, Args);
+  if (ReadGOT == ppc::ReadGOTPtrMode::SecurePlt)
+    Features.push_back("+secure-plt");
+}
+
+ppc::ReadGOTPtrMode ppc::getPPCReadGOTPtrMode(const Driver &D, const ArgList &Args) {
+  if (Args.getLastArg(options::OPT_msecure_plt))
+    return ppc::ReadGOTPtrMode::SecurePlt;
+  return ppc::ReadGOTPtrMode::Bss;
 }
 
 ppc::FloatABI ppc::getPPCFloatABI(const Driver &D, const ArgList &Args) {
diff --git a/clang/lib/Driver/ToolChains/Arch/PPC.h b/clang/lib/Driver/ToolChains/Arch/PPC.h
index 7d7c68101b7..7eb675cdd15 100644
--- a/clang/lib/Driver/ToolChains/Arch/PPC.h
+++ b/clang/lib/Driver/ToolChains/Arch/PPC.h
@@ -29,10 +29,17 @@ enum class FloatABI {
   Hard,
 };
 
+enum class ReadGOTPtrMode {
+  Bss,
+  SecurePlt,
+};
+
 FloatABI getPPCFloatABI(const Driver &D, const llvm::opt::ArgList &Args);
 
 std::string getPPCTargetCPU(const llvm::opt::ArgList &Args);
 const char *getPPCAsmModeForCPU(StringRef Name);
+ReadGOTPtrMode getPPCReadGOTPtrMode(const Driver &D,
+	                                const llvm::opt::ArgList &Args);
 
 void getPPCTargetFeatures(const Driver &D, const llvm::Triple &Triple,
                           const llvm::opt::ArgList &Args,