add regress for #421

tests/regress/mov_gs_eax.py

@@ -0,0 +1,27 @@
+#!/usr/bin/python
+
+from unicorn import *
+from unicorn.x86_const import *
+
+import regress
+
+class VldrPcInsn(regress.RegressTest):
+
+    def runTest(self):
+        uc = Uc(UC_ARCH_X86, UC_MODE_32)
+        uc.mem_map(0x1000, 0x1000)
+        # mov gs, eax; mov eax, 1
+        code = '8ee8b801000000'.decode('hex')
+        uc.mem_write(0x1000, code)
+
+        uc.reg_write(UC_X86_REG_EAX, 0xFFFFFFFF)
+        # this should throw an error
+        # the eax test is just to prove the second instruction doesn't execute
+        try:
+            uc.emu_start(0x1000, len(code))
+        except UcError:
+            return
+        self.assertEqual(uc.reg_read(UC_X86_REG_EAX), 1)
+
+if __name__ == '__main__':
+    regress.main()