[PATCH v2 08/12] target/hppa: Allow read-access to PSW with rsm 0, reg instruction

[deller@kernel.org]

From: Helge Deller <deller@gmx.de>

HP-UX 11 and HP ODE tools use the "rsm 0,%reg" instruction in not priviledged
code paths to get the current PSW flags. The constant 0 means that no bits of
the PSW shall be reset, so this is effectively a read-only access to the PSW.
Allow this read-only access even for not privileged code.

Signed-off-by: Helge Deller <deller@gmx.de>
Acked-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/hppa/translate.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/target/hppa/translate.c b/target/hppa/translate.c
index 53ec57ee86..01f3188656 100644
--- a/target/hppa/translate.c
+++ b/target/hppa/translate.c
@@ -2156,10 +2156,16 @@ static bool trans_ldsid(DisasContext *ctx, arg_ldsid *a)
 
 static bool trans_rsm(DisasContext *ctx, arg_rsm *a)
 {
+#ifdef CONFIG_USER_ONLY
     CHECK_MOST_PRIVILEGED(EXCP_PRIV_OPR);
-#ifndef CONFIG_USER_ONLY
+#else
     TCGv_i64 tmp;
 
+    /* HP-UX 11i and HP ODE use rsm for read-access to PSW */
+    if (a->i) {
+        CHECK_MOST_PRIVILEGED(EXCP_PRIV_OPR);
+    }
+
     nullify_over(ctx);
 
     tmp = tcg_temp_new_i64();
-- 
2.43.0