From 872be901d4563e97b38acd1673536f40b2ce76c4 Mon Sep 17 00:00:00 2001
From: Yongbok Kim <yongbok.kim@mips.com>
Date: Tue, 3 Jul 2018 00:57:01 -0400
Subject: [PATCH] target/mips: Raise a RI when given fs is n/a from CTC1

Fix to raise a Reserved Instruction exception when given fs is not
available from CTC1.

Backports commit f48a2cb21824217a61ec7be797860a0702e5325c from qemu
---
 qemu/target/mips/op_helper.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/qemu/target/mips/op_helper.c b/qemu/target/mips/op_helper.c
index 1651b73a..2f2ae753 100644
--- a/qemu/target/mips/op_helper.c
+++ b/qemu/target/mips/op_helper.c
@@ -2617,6 +2617,9 @@ void helper_ctc1(CPUMIPSState *env, target_ulong arg1, uint32_t fs, uint32_t rt)
                (env->active_fpu.fcr31 & ~(env->active_fpu.fcr31_rw_bitmask));
         break;
     default:
+        if (env->insn_flags & ISA_MIPS32R6) {
+            do_raise_exception(env, EXCP_RI, GETPC());
+        }
         return;
     }
     restore_fp_status(env);