target-ppc: add setb instruction

The CR number is provided in the opcode as - BFA (11:13)

Returns:
  -1 if bit 0 of CR field is set
   1 if bit 1 of CR field is set
   0 otherwise.

Signed-off-by: Vivek Andrew Sha <vivekandrewsha@gmail.com>
[ reworded commit, used 32bit ops as crf is 32bits ]
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

target-ppc/translate.c

@@ -4867,6 +4867,27 @@ static void gen_mtspr(DisasContext *ctx)
     }
 }
 
+#if defined(TARGET_PPC64)
+/* setb */
+static void gen_setb(DisasContext *ctx)
+{
+    TCGv_i32 t0 = tcg_temp_new_i32();
+    TCGv_i32 t8 = tcg_temp_new_i32();
+    TCGv_i32 tm1 = tcg_temp_new_i32();
+    int crf = crfS(ctx->opcode);
+
+    tcg_gen_setcondi_i32(TCG_COND_GEU, t0, cpu_crf[crf], 4);
+    tcg_gen_movi_i32(t8, 8);
+    tcg_gen_movi_i32(tm1, -1);
+    tcg_gen_movcond_i32(TCG_COND_GEU, t0, cpu_crf[crf], t8, tm1, t0);
+    tcg_gen_ext_i32_tl(cpu_gpr[rD(ctx->opcode)], t0);
+
+    tcg_temp_free_i32(t0);
+    tcg_temp_free_i32(t8);
+    tcg_temp_free_i32(tm1);
+}
+#endif
+
 /***                         Cache management                              ***/
 
 /* dcbf */
@@ -10185,6 +10206,7 @@ GEN_HANDLER(mftb, 0x1F, 0x13, 0x0B, 0x00000001, PPC_MFTB),
 GEN_HANDLER(mtcrf, 0x1F, 0x10, 0x04, 0x00000801, PPC_MISC),
 #if defined(TARGET_PPC64)
 GEN_HANDLER(mtmsrd, 0x1F, 0x12, 0x05, 0x001EF801, PPC_64B),
+GEN_HANDLER_E(setb, 0x1F, 0x00, 0x04, 0x0003F801, PPC_NONE, PPC2_ISA300),
 #endif
 GEN_HANDLER(mtmsr, 0x1F, 0x12, 0x04, 0x001EF801, PPC_MISC),
 GEN_HANDLER(mtspr, 0x1F, 0x13, 0x0E, 0x00000000, PPC_MISC),