EHABI: fail on WMMX vops without WMMX support

When the unwinder is built without WMMX support, if we encounter a WMMX register
virtual operation, early rather than attempting to continue as we would not have
saved the register set anyways.  This should never come down this path, but,
just in case, help it abort more explicitly.

llvm-svn: 279941

1 files changed, 10 insertions, 4 deletions

diff --git a/libunwind/src/Unwind-EHABI.cpp b/libunwind/src/Unwind-EHABI.cpp
index 0e9b03491b0..c6a66a33bde 100644
--- a/libunwind/src/Unwind-EHABI.cpp
+++ b/libunwind/src/Unwind-EHABI.cpp
@@ -893,8 +893,11 @@ _Unwind_VRS_Pop(_Unwind_Context *context, _Unwind_VRS_RegClass regclass,
                        static_cast<void *>(context), regclass, discriminator,
                        representation);
   switch (regclass) {
-    case _UVRSC_CORE:
-    case _UVRSC_WMMXC: {
+    case _UVRSC_WMMXC:
+#if !defined(__ARM_WMMX)
+      break;
+#endif
+    case _UVRSC_CORE: {
       if (representation != _UVRSD_UINT32)
         return _UVRSR_FAILED;
       // When popping SP from the stack, we don't want to override it from the
@@ -922,8 +925,11 @@ _Unwind_VRS_Pop(_Unwind_Context *context, _Unwind_VRS_RegClass regclass,
       }
       return _UVRSR_OK;
     }
-    case _UVRSC_VFP:
-    case _UVRSC_WMMXD: {
+    case _UVRSC_WMMXD:
+#if !defined(__ARM_WMMX)
+      break;
+#endif
+    case _UVRSC_VFP: {
       if (representation != _UVRSD_VFPX && representation != _UVRSD_DOUBLE)
         return _UVRSR_FAILED;
       uint32_t first = discriminator >> 16;