diff --git a/src/vm.py b/src/vm.py
index 6394b23..7cb4196 100644
--- a/src/vm.py
+++ b/src/vm.py
@@ -23,9 +23,19 @@ class VMCC(IntFlag):
     NEGATIVE = 1 << 1
     ZERO     = 1 << 0
 
+@dataclass
 class Breakpoint(Exception):
     address: int
 
+class VMExceptionType(Enum):
+    END_OF_MEM = auto()
+    INVALID_OPCODE = auto()
+
+@dataclass
+class VMException(Exception):
+    cause: VMExceptionType
+    pc: int
+
 @dataclass
 class VM:
     instr_callbacks: ClassVar[dict[OpcodeDescription, Callable]]