From 60445285a84915cc4a064acf0a3d15e89f9fac40 Mon Sep 17 00:00:00 2001
From: ths <ths@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Tue, 23 Oct 2007 23:58:21 +0000
Subject: [PATCH] Fix writable length of the index register.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3431 c046a42c-6fe2-441c-8c8c-71466251a162
---
 target-mips/op.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/target-mips/op.c b/target-mips/op.c
index ca367d76..a666006a 100644
--- a/target-mips/op.c
+++ b/target-mips/op.c
@@ -1481,7 +1481,14 @@ void op_mfc0_desave (void)
 
 void op_mtc0_index (void)
 {
-    env->CP0_Index = (env->CP0_Index & 0x80000000) | (T0 % env->tlb->nb_tlb);
+    int num = 1;
+    unsigned int tmp = env->tlb->nb_tlb;
+
+    do {
+        tmp >>= 1;
+        num <<= 1;
+    } while (tmp);
+    env->CP0_Index = (env->CP0_Index & 0x80000000) | (T0 & (num - 1));
     RETURN();
 }
 
-- 
2.39.5