[PATCH] ArmPkg/DefaultExceptionHandlerLib ARM: avoid endless loop in RELEASE builds

[Ard Biesheuvel <ard.biesheuvel@linaro.org>]

Ensure that we prevent the CPU from proceeding after having taken an
unhandled exception on a RELEASE build, which does not contain the
ASSERT() which ensures this on DEBUG and NOOPT builds.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 ArmPkg/Library/DefaultExceptionHandlerLib/Arm/DefaultExceptionHandler.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/ArmPkg/Library/DefaultExceptionHandlerLib/Arm/DefaultExceptionHandler.c b/ArmPkg/Library/DefaultExceptionHandlerLib/Arm/DefaultExceptionHandler.c
index 0b9da031b47d..9d96d5aabd96 100644
--- a/ArmPkg/Library/DefaultExceptionHandlerLib/Arm/DefaultExceptionHandler.c
+++ b/ArmPkg/Library/DefaultExceptionHandlerLib/Arm/DefaultExceptionHandler.c
@@ -267,10 +267,15 @@ DefaultExceptionHandler (
   DEBUG ((EFI_D_ERROR, "\n"));
   ASSERT (FALSE);
 
+  if (!PcAdjust) {
+    CpuDeadLoop ();
+  }
+
   // Clear the error registers that we have already displayed incase some one wants to keep going
   SystemContext.SystemContextArm->DFSR = 0;
   SystemContext.SystemContextArm->IFSR = 0;
 
   // If some one is stepping past the exception handler adjust the PC to point to the next instruction
   SystemContext.SystemContextArm->PC += PcAdjust;
+
 }
-- 
2.19.2