Add asm handlers for all exceptions.

Change-Id: Iec3b10c344594d2bff110b4c3239298dc7e0c8d3
diff --git a/inc/hf/cpu.h b/inc/hf/cpu.h
index af01151..94ca629 100644
--- a/inc/hf/cpu.h
+++ b/inc/hf/cpu.h
@@ -84,3 +84,4 @@
 void vcpu_init(struct vcpu *vcpu, struct vm *vm);
 void vcpu_on(struct vcpu *vcpu);
 void vcpu_off(struct vcpu *vcpu);
+size_t vcpu_index(struct vcpu *vcpu);