Index: lldb/trunk/test/functionalities/inferior-assert/TestInferiorAssert.py
===================================================================
--- lldb/trunk/test/functionalities/inferior-assert/TestInferiorAssert.py
+++ lldb/trunk/test/functionalities/inferior-assert/TestInferiorAssert.py
@@ -2,7 +2,7 @@
 
 import os, time
 import unittest2
-import lldb, lldbutil
+import lldb, lldbutil, lldbplatformutil
 from lldbtest import *
 
 class AssertingInferiorTestCase(TestBase):
@@ -149,8 +149,7 @@
         self.check_stop_reason()
 
         # lldb should be able to read from registers from the inferior after asserting.
-        self.expect("register read eax",
-            substrs = ['eax = 0x'])
+        lldbplatformutil.check_first_register_readable(self)
 
     def inferior_asserting_disassemble(self):
         """Test that lldb can disassemble frames after asserting."""
Index: lldb/trunk/test/functionalities/inferior-crashing/TestInferiorCrashing.py
===================================================================
--- lldb/trunk/test/functionalities/inferior-crashing/TestInferiorCrashing.py
+++ lldb/trunk/test/functionalities/inferior-crashing/TestInferiorCrashing.py
@@ -2,7 +2,7 @@
 
 import os, time
 import unittest2
-import lldb, lldbutil
+import lldb, lldbutil, lldbplatformutil
 from lldbtest import *
 
 class CrashingInferiorTestCase(TestBase):
@@ -153,8 +153,7 @@
         self.check_stop_reason()
 
         # lldb should be able to read from registers from the inferior after crashing.
-        self.expect("register read eax",
-            substrs = ['eax = 0x'])
+        lldbplatformutil.check_first_register_readable(self)
 
     def inferior_crashing_expr(self):
         """Test that the lldb expression interpreter can read symbols after crashing."""
@@ -193,8 +192,7 @@
             substrs = ['= 0x0'])
 
         # lldb should be able to read from registers from the inferior after crashing.
-        self.expect("register read eax",
-            substrs = ['eax = 0x'])
+        lldbplatformutil.check_first_register_readable(self)
 
         # And it should report the correct line number.
         self.expect("thread backtrace all",
Index: lldb/trunk/test/functionalities/inferior-crashing/recursive-inferior/TestRecursiveInferior.py
===================================================================
--- lldb/trunk/test/functionalities/inferior-crashing/recursive-inferior/TestRecursiveInferior.py
+++ lldb/trunk/test/functionalities/inferior-crashing/recursive-inferior/TestRecursiveInferior.py
@@ -2,7 +2,7 @@
 
 import os, time
 import unittest2
-import lldb, lldbutil
+import lldb, lldbutil, lldbplatformutil
 import sys
 from lldbtest import *
 
@@ -157,8 +157,7 @@
         self.check_stop_reason()
 
         # lldb should be able to read from registers from the inferior after crashing.
-        self.expect("register read eax",
-            substrs = ['eax = 0x'])
+        lldbplatformutil.check_first_register_readable(self)
 
     def recursive_inferior_crashing_expr(self):
         """Test that the lldb expression interpreter can read symbols after crashing."""
@@ -192,8 +191,7 @@
             substrs = ['(int) $0 ='])
 
         # lldb should be able to read from registers from the inferior after crashing.
-        self.expect("register read eax",
-            substrs = ['eax = 0x'])
+        lldbplatformutil.check_first_register_readable(self)
 
         # And it should report the correct line number.
         self.expect("thread backtrace all",
Index: lldb/trunk/test/lldbplatformutil.py
===================================================================
--- lldb/trunk/test/lldbplatformutil.py
+++ lldb/trunk/test/lldbplatformutil.py
@@ -0,0 +1,11 @@
+""" This module contains functions used by the test cases to hide the
+architecture and/or the platform dependent nature of the tests. """
+
+def check_first_register_readable(test_case):
+    if test_case.getArchitecture() in ['x86_64', 'i386']:
+        test_case.expect("register read eax", substrs = ['eax = 0x'])
+    elif test_case.getArchitecture() in ['aarch64']:
+        test_case.expect("register read x0", substrs = ['x0 = 0x'])
+    else:
+        # TODO: Add check for other architectures
+        test_case.fail("Unsupported architecture for test case (arch: %s)" % test_case.getArchitecture())