[Qemu-devel] [PATCH] target-s390x: Add Extract PSW instruction

[Bastian Koppelmann]

Never versions of the linux kernel need this instruction, so let's add it to
the tcg frontend.

Signed-off-by: Bastian Koppelmann <address@hidden>
---
 target-s390x/insn-data.def |  3 ++-
 target-s390x/translate.c   | 19 +++++++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/target-s390x/insn-data.def b/target-s390x/insn-data.def
index 4d2feb6..338d510 100644
--- a/target-s390x/insn-data.def
+++ b/target-s390x/insn-data.def
@@ -287,7 +287,8 @@
     C(0xb24f, EAR,     RRE,   Z,   0, 0, new, r1_32, ear, 0)
 /* EXTRACT FPC */
     C(0xb38c, EFPC,    RRE,   Z,   0, 0, new, r1_32, efpc, 0)
-
+/* EXTRACT PSW */
+    C(0xb98d, EPSW,    RRE,   Z,   0, 0, new, r1_32, epsw, 0)
 /* FIND LEFTMOST ONE */
     C(0xb983, FLOGR,   RRE,   EI,  0, r2_o, r1_P, 0, flogr, 0)
 
diff --git a/target-s390x/translate.c b/target-s390x/translate.c
index dbf1993..539a794 100644
--- a/target-s390x/translate.c
+++ b/target-s390x/translate.c
@@ -2051,6 +2051,25 @@ static ExitStatus op_efpc(DisasContext *s, DisasOps *o)
     return NO_EXIT;
 }
 
+static ExitStatus op_epsw(DisasContext *s, DisasOps *o)
+{
+   TCGv tmp = tcg_temp_new();
+    int r1 = get_field(s->fields, r1);
+    int r2 = get_field(s->fields, r2);
+
+    tcg_gen_shli_tl(tmp, psw_mask, 32);
+    tcg_gen_andi_tl(regs[r1], regs[r1], ~0xffffffffull);
+    tcg_gen_or_tl(regs[r1], regs[r1], tmp);
+
+    if (r2 != 0) {
+        tcg_gen_andi_tl(tmp, psw_mask, ~0xffffffffull);
+        tcg_gen_andi_tl(regs[r2], regs[r2], ~0xffffffffull);
+        tcg_gen_or_tl(regs[r2], regs[r2], tmp);
+    }
+    tcg_temp_free(tmp);
+    return NO_EXIT;
+}
+
 static ExitStatus op_ex(DisasContext *s, DisasOps *o)
 {
     /* ??? Perhaps a better way to implement EXECUTE is to set a bit in
-- 
2.1.3