Initial checkin for stack protectors. Here's what it does:
* The prologue is modified to read the __stack_chk_guard global and insert it
onto the stack.
* The epilogue is modified to read the stored guard from the stack and compare
it to the original __stack_chk_guard value. If they differ, then the
__stack_chk_fail() function is called.
* The stack protector needs to be first on the stack (after the parameters) to
catch any stack-smashing activities.
Front-end support will follow after a round of beta testing.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58673 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LLVMTargetMachine.cpp b/lib/CodeGen/LLVMTargetMachine.cpp
index ee3f604..e1dd463 100644
--- a/lib/CodeGen/LLVMTargetMachine.cpp
+++ b/lib/CodeGen/LLVMTargetMachine.cpp
@@ -60,6 +60,11 @@
EnableFastISelOption("fast-isel", cl::Hidden,
cl::desc("Enable the experimental \"fast\" instruction selector"));
+// Enable stack protectors.
+static cl::opt<int>
+EnableStackProtector("enable-stack-protector", cl::init(0),
+ cl::desc("Use ProPolice as a stack protection method."));
+
FileModel::Model
LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
raw_ostream &Out,
@@ -165,6 +170,8 @@
if (!Fast)
PM.add(createCodeGenPreparePass(getTargetLowering()));
+ PM.add(createStackProtectorPass(EnableStackProtector));
+
if (PrintISelInput)
PM.add(createPrintFunctionPass("\n\n"
"*** Final LLVM Code input to ISel ***\n",