target/arm: Add SVE decode skeleton

Including only 4, as-yet unimplemented, instruction patterns
so that the whole thing compiles.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180516223007.10256-3-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

.gitignore

@@ -206,3 +206,4 @@ trace-dtrace-root.h
 trace-dtrace-root.dtrace
 trace-ust-all.h
 trace-ust-all.c
+/target/arm/decode-sve.inc.c

target/arm/Makefile.objs

@@ -10,3 +10,13 @@ obj-y += gdbstub.o
 obj-$(TARGET_AARCH64) += cpu64.o translate-a64.o helper-a64.o gdbstub64.o
 obj-y += crypto_helper.o
 obj-$(CONFIG_SOFTMMU) += arm-powerctl.o
+
+DECODETREE = $(SRC_PATH)/scripts/decodetree.py
+
+target/arm/decode-sve.inc.c: $(SRC_PATH)/target/arm/sve.decode $(DECODETREE)
+	$(call quiet-command,\
+	  $(PYTHON) $(DECODETREE) --decode disas_sve -o $@ $<,\
+	  "GEN", $(TARGET_DIR)$@)
+
+target/arm/translate-sve.o: target/arm/decode-sve.inc.c
+obj-$(TARGET_AARCH64) += translate-sve.o

target/arm/sve.decode

@@ -0,0 +1,45 @@
+# AArch64 SVE instruction descriptions
+#
+#  Copyright (c) 2017 Linaro, Ltd
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, see <http://www.gnu.org/licenses/>.
+
+#
+# This file is processed by scripts/decodetree.py
+#
+
+###########################################################################
+# Named attribute sets.  These are used to make nice(er) names
+# when creating helpers common to those for the individual
+# instruction patterns.
+
+&rrr_esz        rd rn rm esz
+
+###########################################################################
+# Named instruction formats.  These are generally used to
+# reduce the amount of duplication between instruction patterns.
+
+# Three operand with unused vector element size
+@rd_rn_rm_e0    ........ ... rm:5 ... ... rn:5 rd:5             &rrr_esz esz=0
+
+###########################################################################
+# Instruction patterns.  Grouped according to the SVE encodingindex.xhtml.
+
+### SVE Logical - Unpredicated Group
+
+# SVE bitwise logical operations (unpredicated)
+AND_zzz         00000100 00 1 ..... 001 100 ..... .....         @rd_rn_rm_e0
+ORR_zzz         00000100 01 1 ..... 001 100 ..... .....         @rd_rn_rm_e0
+EOR_zzz         00000100 10 1 ..... 001 100 ..... .....         @rd_rn_rm_e0
+BIC_zzz         00000100 11 1 ..... 001 100 ..... .....         @rd_rn_rm_e0

target/arm/translate-a64.c

@@ -13676,9 +13676,14 @@ static void disas_a64_insn(CPUARMState *env, DisasContext *s)
     s->fp_access_checked = false;
 
     switch (extract32(insn, 25, 4)) {
-    case 0x0: case 0x1: case 0x2: case 0x3: /* UNALLOCATED */
+    case 0x0: case 0x1: case 0x3: /* UNALLOCATED */
         unallocated_encoding(s);
         break;
+    case 0x2:
+        if (!arm_dc_feature(s, ARM_FEATURE_SVE) || !disas_sve(s, insn)) {
+            unallocated_encoding(s);
+        }
+        break;
     case 0x8: case 0x9: /* Data processing - immediate */
         disas_data_proc_imm(s, insn);
         break;

target/arm/translate-sve.c

@@ -0,0 +1,63 @@
+/*
+ * AArch64 SVE translation
+ *
+ * Copyright (c) 2018 Linaro, Ltd
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+#include "cpu.h"
+#include "exec/exec-all.h"
+#include "tcg-op.h"
+#include "tcg-op-gvec.h"
+#include "qemu/log.h"
+#include "arm_ldst.h"
+#include "translate.h"
+#include "internals.h"
+#include "exec/helper-proto.h"
+#include "exec/helper-gen.h"
+#include "exec/log.h"
+#include "trace-tcg.h"
+#include "translate-a64.h"
+
+/*
+ * Include the generated decoder.
+ */
+
+#include "decode-sve.inc.c"
+
+/*
+ * Implement all of the translator functions referenced by the decoder.
+ */
+
+static bool trans_AND_zzz(DisasContext *s, arg_AND_zzz *a, uint32_t insn)
+{
+    return false;
+}
+
+static bool trans_ORR_zzz(DisasContext *s, arg_ORR_zzz *a, uint32_t insn)
+{
+    return false;
+}
+
+static bool trans_EOR_zzz(DisasContext *s, arg_EOR_zzz *a, uint32_t insn)
+{
+    return false;
+}
+
+static bool trans_BIC_zzz(DisasContext *s, arg_BIC_zzz *a, uint32_t insn)
+{
+    return false;
+}