[ndk][x86] Add option to store sp cookie in var.

Add an option to store the stack protector cookie
in the global variable.

1 files changed, 9 insertions, 0 deletions

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index b75842738ee..28475bded65 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -84,6 +84,12 @@ static cl::opt<int> ReciprocalEstimateRefinementSteps(
              "result of the hardware reciprocal estimate instruction."),
     cl::NotHidden);
 
+// Force to store the stack protector cookie in the global variable
+static cl::opt<bool> ForceGlobalVarStackProtectorCookie(
+  "x86-force-gv-stack-cookie",
+  cl::init(false),
+  cl::desc("Store the stack protector cookie in the global variable"));
+
 // Forward declarations.
 static SDValue getMOVL(SelectionDAG &DAG, SDLoc dl, EVT VT, SDValue V1,
                        SDValue V2);
@@ -1962,6 +1968,9 @@ bool X86TargetLowering::getStackCookieLocation(unsigned &AddressSpace,
   if (!Subtarget->isTargetLinux())
     return false;
 
+  if (ForceGlobalVarStackProtectorCookie)
+    return false;
+
   if (Subtarget->is64Bit()) {
     // %fs:0x28, unless we're using a Kernel code model, in which case it's %gs:
     Offset = 0x28;