From: Giuseppe Musacchio <thatlemon@gmail.com>
Date: Thu, 25 Jun 2020 09:12:04 +0000 (+0200)
Subject: linux-user/sparc64: Fix the handling of window spill trap
X-Git-Tag: v5.1.0-rc0~33^2~10
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=d43624c400597aec18dff917c1424b807bbb473d;p=thirdparty%2Fqemu.git

linux-user/sparc64: Fix the handling of window spill trap

Fix the handling of window spill traps by keeping cansave into account
when calculating the new CWP.

Signed-off-by: Giuseppe Musacchio <thatlemon@gmail.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200625091204.3186186-3-laurent@vivier.eu>
---

diff --git a/bsd-user/main.c b/bsd-user/main.c
index 0bfe46cff93..ac40d79bfaa 100644
--- a/bsd-user/main.c
+++ b/bsd-user/main.c
@@ -413,7 +413,11 @@ static void save_window(CPUSPARCState *env)
     save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
     env->wim = new_wim;
 #else
-    save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
+    /*
+     * cansave is zero if the spill trap handler is triggered by `save` and
+     * nonzero if triggered by a `flushw`
+     */
+    save_window_offset(env, cpu_cwp_dec(env, env->cwp - env->cansave - 2));
     env->cansave++;
     env->canrestore--;
 #endif
diff --git a/linux-user/sparc/cpu_loop.c b/linux-user/sparc/cpu_loop.c
index 7645cc04ca7..02532f198df 100644
--- a/linux-user/sparc/cpu_loop.c
+++ b/linux-user/sparc/cpu_loop.c
@@ -69,7 +69,11 @@ static void save_window(CPUSPARCState *env)
     save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
     env->wim = new_wim;
 #else
-    save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
+    /*
+     * cansave is zero if the spill trap handler is triggered by `save` and
+     * nonzero if triggered by a `flushw`
+     */
+    save_window_offset(env, cpu_cwp_dec(env, env->cwp - env->cansave - 2));
     env->cansave++;
     env->canrestore--;
 #endif