From: Max Filippov <jcmvbkbc@gmail.com>
Date: Mon, 31 Oct 2011 21:51:02 +0000 (+0400)
Subject: target-xtensa: mask out undefined bits of WINDOWSTART SR
X-Git-Tag: qemu-xen-4.3.0-rc1~2053^2~5
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=53a72dfda584c8d54df61f7c1aea9f9ff86b138c;p=qemu-upstream-4.5-testing.git

target-xtensa: mask out undefined bits of WINDOWSTART SR

According to ISA, table 5-156, bits 32:NAREG/4 of the WINDOWSTART SR
must be zero.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
---

diff --git a/target-xtensa/translate.c b/target-xtensa/translate.c
index 1688bb246..b724d466d 100644
--- a/target-xtensa/translate.c
+++ b/target-xtensa/translate.c
@@ -466,7 +466,7 @@ static void gen_wsr_windowbase(DisasContext *dc, uint32_t sr, TCGv_i32 v)
 
 static void gen_wsr_windowstart(DisasContext *dc, uint32_t sr, TCGv_i32 v)
 {
-    tcg_gen_mov_i32(cpu_SR[sr], v);
+    tcg_gen_andi_i32(cpu_SR[sr], v, (1 << dc->config->nareg / 4) - 1);
     reset_used_window(dc);
 }