From bfc5637339cb2f046bb5a5aeb864b248340404bc Mon Sep 17 00:00:00 2001
From: Aleksandar Markovic <amarkovic@wavecomp.com>
Date: Mon, 27 Aug 2018 04:17:17 -0400
Subject: [PATCH] target/mips: Add nanoMIPS decoding and extraction utilities

Add some basic utility functions and macros for nanoMIPS decoding
engine.

Backports commit 6bfa9f4c9cf24d6cfaaa227722e9cdcca1ad6fe9 from qemu
---
 qemu/target/mips/translate.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/qemu/target/mips/translate.c b/qemu/target/mips/translate.c
index f86d6990..cdd61f94 100644
--- a/qemu/target/mips/translate.c
+++ b/qemu/target/mips/translate.c
@@ -16703,6 +16703,17 @@ enum {
  *
  */
 
+
+/* extraction utilities */
+
+#define NANOMIPS_EXTRACT_RD(op) ((op >> 7) & 0x7)
+#define NANOMIPS_EXTRACT_RS(op) ((op >> 4) & 0x7)
+#define NANOMIPS_EXTRACT_RS2(op) uMIPS_RS(op)
+#define NANOMIPS_EXTRACT_RS1(op) ((op >> 1) & 0x7)
+#define NANOMIPS_EXTRACT_RD5(op) ((op >> 5) & 0x1f)
+#define NANOMIPS_EXTRACT_RS5(op) (op & 0x1f)
+
+
 static int decode_nanomips_opc(CPUMIPSState *env, DisasContext *ctx)
 {
     return 2;