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diff --git a/cpu/sh2/sh2.h b/cpu/sh2/sh2.h
index 8e9f3b0..9d6f0d2 100644
--- a/cpu/sh2/sh2.h
+++ b/cpu/sh2/sh2.h
@@ -1,6 +1,13 @@
 #ifndef __SH2_H__
 #define __SH2_H__
 
+// registers - matches structure order
+typedef enum {
+  SHR_R0 = 0, SHR_SP = 15,
+  SHR_PC,  SHR_PPC, SHR_PR,   SHR_SR,
+  SHR_GBR, SHR_VBR, SHR_MACH, SHR_MACL,
+} sh2_reg_e;
+
 typedef struct
 {
 	unsigned int	r[16];		// 00