[PATCH v2 1/3] target/hppa: Fix assemble_16 insns for wide mode

[Richard Henderson <richard.henderson@linaro.org>]

Reported-by: Sven Schnelle <svens@stackframe.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/hppa/insns.decode | 15 +++++++++------
 target/hppa/translate.c  | 22 ++++++++++++++++++++++
 2 files changed, 31 insertions(+), 6 deletions(-)

diff --git a/target/hppa/insns.decode b/target/hppa/insns.decode
index f5a3f02fd1..0d9f8159ec 100644
--- a/target/hppa/insns.decode
+++ b/target/hppa/insns.decode
@@ -27,13 +27,14 @@
 %assemble_11a   0:s1 4:10            !function=expand_shl3
 %assemble_12    0:s1 2:1 3:10        !function=expand_shl2
 %assemble_12a   0:s1 3:11            !function=expand_shl2
+%assemble_16    0:16                 !function=expand_16
 %assemble_17    0:s1 16:5 2:1 3:10   !function=expand_shl2
 %assemble_22    0:s1 16:10 2:1 3:10  !function=expand_shl2
+%assemble_sp    14:2                 !function=sp0_if_wide
 
 %assemble_21    0:s1 1:11 14:2 16:5 12:2  !function=expand_shl11
 
 %lowsign_11     0:s1 1:10
-%lowsign_14     0:s1 1:13
 
 %sm_imm         16:10 !function=expand_sm_imm
 
@@ -221,7 +222,7 @@ sub_b_tsv       000010 ..... ..... .... 110100 . .....  @rrr_cf_d
 
 ldil            001000 t:5 .....................        i=%assemble_21
 addil           001010 r:5 .....................        i=%assemble_21
-ldo             001101 b:5 t:5 -- ..............        i=%lowsign_14
+ldo             001101 b:5 t:5  ................        i=%assemble_16
 
 addi            101101 ..... ..... .... 0 ...........   @rri_cf
 addi_tsv        101101 ..... ..... .... 1 ...........   @rri_cf
@@ -306,10 +307,12 @@ fstd            001011 ..... ..... .. . 1 -- 100 0 . .....      @fldstdi
 
 @ldstim11       ...... b:5 t:5 sp:2 ..............      \
                 &ldst disp=%assemble_11a m=%ma2_to_m x=0 scale=0 size=3
-@ldstim14       ...... b:5 t:5 sp:2 ..............      \
-                &ldst disp=%lowsign_14 x=0 scale=0 m=0
-@ldstim14m      ...... b:5 t:5 sp:2 ..............      \
-                &ldst disp=%lowsign_14 x=0 scale=0 m=%neg_to_m
+@ldstim14       ...... b:5 t:5 ................          \
+                &ldst sp=%assemble_sp disp=%assemble_16  \
+                x=0 scale=0 m=0
+@ldstim14m      ...... b:5 t:5 ................          \
+                &ldst sp=%assemble_sp disp=%assemble_16  \
+                x=0 scale=0 m=%neg_to_m
 @ldstim12m      ...... b:5 t:5 sp:2 ..............      \
                 &ldst disp=%assemble_12a x=0 scale=0 m=%pos_to_m
 
diff --git a/target/hppa/translate.c b/target/hppa/translate.c
index eb2046c5ad..cbe44ef75a 100644
--- a/target/hppa/translate.c
+++ b/target/hppa/translate.c
@@ -144,6 +144,28 @@ static int assemble_6(DisasContext *ctx, int val)
     return (val ^ 31) + 1;
 }
 
+/* Expander for assemble_16(s,im14). */
+static int expand_16(DisasContext *ctx, int val)
+{
+    /*
+     * @val is bits [0:15], containing both im14 and s.
+     * Swizzle thing around depending on PSW.W.
+     */
+    int s = extract32(val, 14, 2);
+    int i = (-(val & 1) << 13) | extract32(val, 1, 13);
+
+    if (ctx->tb_flags & PSW_W) {
+        i ^= s << 13;
+    }
+    return i;
+}
+
+/* The sp field is only present with !PSW_W. */
+static int sp0_if_wide(DisasContext *ctx, int sp)
+{
+    return ctx->tb_flags & PSW_W ? 0 : sp;
+}
+
 /* Translate CMPI doubleword conditions to standard. */
 static int cmpbid_c(DisasContext *ctx, int val)
 {
-- 
2.34.1