target/arm: Convert Data Processing (reg-shifted-reg)

Convert the register shifted by register form of the data
processing insns.  For A32, we cannot yet remove any code
because the legacy decoder intertwines the immediate form.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20190904193059.26202-5-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

3 files changed, 87 insertions, 20 deletions

diff --git a/target/arm/a32.decode b/target/arm/a32.decode
index b23e83f17c..8e0fb06d05 100644
--- a/target/arm/a32.decode
+++ b/target/arm/a32.decode
@@ -23,6 +23,7 @@
 #
 
 &s_rrr_shi       s rd rn rm shim shty
+&s_rrr_shr       s rn rd rm rs shty
 
 # Data-processing (register)
 
@@ -49,3 +50,29 @@ ORR_rrri         .... 000 1100 . .... .... ..... .. 0 ....    @s_rrr_shi
 MOV_rxri         .... 000 1101 . 0000 .... ..... .. 0 ....    @s_rxr_shi
 BIC_rrri         .... 000 1110 . .... .... ..... .. 0 ....    @s_rrr_shi
 MVN_rxri         .... 000 1111 . 0000 .... ..... .. 0 ....    @s_rxr_shi
+
+# Data-processing (register-shifted register)
+
+@s_rrr_shr       ---- ... .... s:1 rn:4 rd:4 rs:4 . shty:2 . rm:4 \
+                 &s_rrr_shr
+@s_rxr_shr       ---- ... .... s:1 .... rd:4 rs:4 . shty:2 . rm:4 \
+                 &s_rrr_shr rn=0
+@S_xrr_shr       ---- ... .... .   rn:4 .... rs:4 . shty:2 . rm:4 \
+                 &s_rrr_shr rd=0 s=1
+
+AND_rrrr         .... 000 0000 . .... .... .... 0 .. 1 ....   @s_rrr_shr
+EOR_rrrr         .... 000 0001 . .... .... .... 0 .. 1 ....   @s_rrr_shr
+SUB_rrrr         .... 000 0010 . .... .... .... 0 .. 1 ....   @s_rrr_shr
+RSB_rrrr         .... 000 0011 . .... .... .... 0 .. 1 ....   @s_rrr_shr
+ADD_rrrr         .... 000 0100 . .... .... .... 0 .. 1 ....   @s_rrr_shr
+ADC_rrrr         .... 000 0101 . .... .... .... 0 .. 1 ....   @s_rrr_shr
+SBC_rrrr         .... 000 0110 . .... .... .... 0 .. 1 ....   @s_rrr_shr
+RSC_rrrr         .... 000 0111 . .... .... .... 0 .. 1 ....   @s_rrr_shr
+TST_xrrr         .... 000 1000 1 .... 0000 .... 0 .. 1 ....   @S_xrr_shr
+TEQ_xrrr         .... 000 1001 1 .... 0000 .... 0 .. 1 ....   @S_xrr_shr
+CMP_xrrr         .... 000 1010 1 .... 0000 .... 0 .. 1 ....   @S_xrr_shr
+CMN_xrrr         .... 000 1011 1 .... 0000 .... 0 .. 1 ....   @S_xrr_shr
+ORR_rrrr         .... 000 1100 . .... .... .... 0 .. 1 ....   @s_rrr_shr
+MOV_rxrr         .... 000 1101 . 0000 .... .... 0 .. 1 ....   @s_rxr_shr
+BIC_rrrr         .... 000 1110 . .... .... .... 0 .. 1 ....   @s_rrr_shr
+MVN_rxrr         .... 000 1111 . 0000 .... .... 0 .. 1 ....   @s_rxr_shr
diff --git a/target/arm/t32.decode b/target/arm/t32.decode
index 7068596b99..f0a73fa003 100644
--- a/target/arm/t32.decode
+++ b/target/arm/t32.decode
@@ -20,6 +20,7 @@
 #
 
 &s_rrr_shi       !extern s rd rn rm shim shty
+&s_rrr_shr       !extern s rn rd rm rs shty
 
 # Data-processing (register)
 
@@ -61,3 +62,8 @@ SBC_rrri         1110101 1011 . .... 0 ... .... .... ....     @s_rrr_shi
   SUB_rrri       1110101 1101 . .... 0 ... .... .... ....     @s_rrr_shi
 }
 RSB_rrri         1110101 1110 . .... 0 ... .... .... ....     @s_rrr_shi
+
+# Data-processing (register-shifted register)
+
+MOV_rxrr         1111 1010 0 shty:2 s:1 rm:4 1111 rd:4 0000 rs:4 \
+                 &s_rrr_shr rn=0
diff --git a/target/arm/translate.c b/target/arm/translate.c
index cb97f5b22d..ff78b1bb74 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -7795,17 +7795,66 @@ static bool op_s_rxr_shi(DisasContext *s, arg_s_rrr_shi *a,
     return store_reg_kind(s, a->rd, tmp, kind);
 }
 
+/*
+ * Data-processing (register-shifted register)
+ *
+ * Operate, with set flags, one register source,
+ * one register shifted register source, and a destination.
+ */
+static bool op_s_rrr_shr(DisasContext *s, arg_s_rrr_shr *a,
+                         void (*gen)(TCGv_i32, TCGv_i32, TCGv_i32),
+                         int logic_cc, StoreRegKind kind)
+{
+    TCGv_i32 tmp1, tmp2;
+
+    tmp1 = load_reg(s, a->rs);
+    tmp2 = load_reg(s, a->rm);
+    gen_arm_shift_reg(tmp2, a->shty, tmp1, logic_cc);
+    tmp1 = load_reg(s, a->rn);
+
+    gen(tmp1, tmp1, tmp2);
+    tcg_temp_free_i32(tmp2);
+
+    if (logic_cc) {
+        gen_logic_CC(tmp1);
+    }
+    return store_reg_kind(s, a->rd, tmp1, kind);
+}
+
+static bool op_s_rxr_shr(DisasContext *s, arg_s_rrr_shr *a,
+                         void (*gen)(TCGv_i32, TCGv_i32),
+                         int logic_cc, StoreRegKind kind)
+{
+    TCGv_i32 tmp1, tmp2;
+
+    tmp1 = load_reg(s, a->rs);
+    tmp2 = load_reg(s, a->rm);
+    gen_arm_shift_reg(tmp2, a->shty, tmp1, logic_cc);
+
+    gen(tmp2, tmp2);
+    if (logic_cc) {
+        gen_logic_CC(tmp2);
+    }
+    return store_reg_kind(s, a->rd, tmp2, kind);
+}
+
 #define DO_ANY3(NAME, OP, L, K)                                         \
     static bool trans_##NAME##_rrri(DisasContext *s, arg_s_rrr_shi *a)  \
-    { StoreRegKind k = (K); return op_s_rrr_shi(s, a, OP, L, k); }
+    { StoreRegKind k = (K); return op_s_rrr_shi(s, a, OP, L, k); }      \
+    static bool trans_##NAME##_rrrr(DisasContext *s, arg_s_rrr_shr *a)  \
+    { StoreRegKind k = (K); return op_s_rrr_shr(s, a, OP, L, k); }
 
 #define DO_ANY2(NAME, OP, L, K)                                         \
     static bool trans_##NAME##_rxri(DisasContext *s, arg_s_rrr_shi *a)  \
-    { StoreRegKind k = (K); return op_s_rxr_shi(s, a, OP, L, k); }
+    { StoreRegKind k = (K); return op_s_rxr_shi(s, a, OP, L, k); }      \
+    static bool trans_##NAME##_rxrr(DisasContext *s, arg_s_rrr_shr *a)  \
+    { StoreRegKind k = (K); return op_s_rxr_shr(s, a, OP, L, k); }
 
 #define DO_CMP2(NAME, OP, L)                                            \
     static bool trans_##NAME##_xrri(DisasContext *s, arg_s_rrr_shi *a)  \
-    { return op_s_rrr_shi(s, a, OP, L, STREG_NONE); }
+    { return op_s_rrr_shi(s, a, OP, L, STREG_NONE); }                   \
+    static bool trans_##NAME##_xrrr(DisasContext *s, arg_s_rrr_shr *a)  \
+    { return op_s_rrr_shr(s, a, OP, L, STREG_NONE); }
 
 DO_ANY3(AND, tcg_gen_and_i32, a->s, STREG_NORMAL)
 DO_ANY3(EOR, tcg_gen_xor_i32, a->s, STREG_NORMAL)
@@ -9590,7 +9639,6 @@ static void disas_thumb2_insn(DisasContext *s, uint32_t insn)
     TCGv_i32 addr;
     TCGv_i64 tmp64;
     int op;
-    int logic_cc;
 
     /*
      * ARMv6-M supports a limited subset of Thumb2 instructions.
@@ -10028,22 +10076,8 @@ static void disas_thumb2_insn(DisasContext *s, uint32_t insn)
         if (op < 4 && (insn & 0xf000) != 0xf000)
             goto illegal_op;
         switch (op) {
-        case 0: /* Register controlled shift.  */
-            tmp = load_reg(s, rn);
-            tmp2 = load_reg(s, rm);
-            if ((insn & 0x70) != 0)
-                goto illegal_op;
-            /*
-             * 0b1111_1010_0xxx_xxxx_1111_xxxx_0000_xxxx:
-             *  - MOV, MOVS (register-shifted register), flagsetting
-             */
-            op = (insn >> 21) & 3;
-            logic_cc = (insn & (1 << 20)) != 0;
-            gen_arm_shift_reg(tmp, op, tmp2, logic_cc);
-            if (logic_cc)
-                gen_logic_CC(tmp);
-            store_reg(s, rd, tmp);
-            break;
+        case 0: /* Register controlled shift, in decodetree */
+            goto illegal_op;
         case 1: /* Sign/zero extend.  */
             op = (insn >> 20) & 7;
             switch (op) {