[PATCH 2/2] DxeMain: Fix the bug that StackGuard is not enabled

["Ni, Ray" <ray.ni@intel.com>]

Commit e7abb94d1 removed InitializeCpuExceptionHandlersEx
and updated DxeMain to call InitializeCpuExceptionHandlers
for exception setup. But the old behavior that calls *Ex() sets
up the stack guard as well. To match the old behavior,
the patch calls InitializeSeparateExceptionStacks.

Signed-off-by: Ray Ni <ray.ni@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
---
 MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c b/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
index 83f49d7c00..0a1f3d79e2 100644
--- a/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
+++ b/MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c
@@ -256,6 +256,14 @@ DxeMain (
   Status = InitializeCpuExceptionHandlers (VectorInfoList);
   ASSERT_EFI_ERROR (Status);
 
+  //
+  // Setup Stack Guard
+  //
+  if (PcdGetBool (PcdCpuStackGuard)) {
+    Status = InitializeSeparateExceptionStacks (NULL);
+    ASSERT_EFI_ERROR (Status);
+  }
+
   //
   // Initialize Debug Agent to support source level debug in DXE phase
   //
-- 
2.35.1.windows.2