Index: UnwindRegistersSave.S
===================================================================
--- UnwindRegistersSave.S
+++ UnwindRegistersSave.S
@@ -316,7 +316,11 @@
   str lr, [r0, #56]
   str lr, [r0, #60]  @ store return address as pc
 #endif
+#if __ARM_ARCH_ISA_THUMB1 == 1
+  movs r0, #0        @ return UNW_ESUCCESS
+#else
   mov r0, #0         @ return UNW_ESUCCESS
+#endif
   JMP(lr)
 
 @