target/arm: Add framework for MVE decode

Add the framework for decoding MVE insns, with the necessary new
files and the meson.build rules, but no actual content yet.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210614151007.4545-11-peter.maydell@linaro.org

target/arm/meson.build

@@ -6,6 +6,7 @@ gen = [
   decodetree.process('vfp.decode', extra_args: '--decode=disas_vfp'),
   decodetree.process('vfp-uncond.decode', extra_args: '--decode=disas_vfp_uncond'),
   decodetree.process('m-nocp.decode', extra_args: '--decode=disas_m_nocp'),
+  decodetree.process('mve.decode', extra_args: '--decode=disas_mve'),
   decodetree.process('a32.decode', extra_args: '--static-decode=disas_a32'),
   decodetree.process('a32-uncond.decode', extra_args: '--static-decode=disas_a32_uncond'),
   decodetree.process('t32.decode', extra_args: '--static-decode=disas_t32'),
@@ -27,6 +28,7 @@ arm_ss.add(files(
   'tlb_helper.c',
   'translate.c',
   'translate-m-nocp.c',
+  'translate-mve.c',
   'translate-neon.c',
   'translate-vfp.c',
   'vec_helper.c',

target/arm/mve.decode

@@ -0,0 +1,20 @@
+# M-profile MVE instruction descriptions
+#
+#  Copyright (c) 2021 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 2.1 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
+#

target/arm/translate-a32.h

@@ -22,6 +22,7 @@
 
 /* Prototypes for autogenerated disassembler functions */
 bool disas_m_nocp(DisasContext *dc, uint32_t insn);
+bool disas_mve(DisasContext *dc, uint32_t insn);
 bool disas_vfp(DisasContext *s, uint32_t insn);
 bool disas_vfp_uncond(DisasContext *s, uint32_t insn);
 bool disas_neon_dp(DisasContext *s, uint32_t insn);

target/arm/translate-mve.c

@@ -0,0 +1,29 @@
+/*
+ *  ARM translation: M-profile MVE instructions
+ *
+ *  Copyright (c) 2021 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 2.1 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 "tcg/tcg-op.h"
+#include "tcg/tcg-op-gvec.h"
+#include "exec/exec-all.h"
+#include "exec/gen-icount.h"
+#include "translate.h"
+#include "translate-a32.h"
+
+/* Include the generated decoder */
+#include "decode-mve.c.inc"

target/arm/translate.c

@@ -8919,6 +8919,7 @@ static void disas_thumb2_insn(DisasContext *s, uint32_t insn)
     if (disas_t32(s, insn) ||
         disas_vfp_uncond(s, insn) ||
         disas_neon_shared(s, insn) ||
+        disas_mve(s, insn) ||
         ((insn >> 28) == 0xe && disas_vfp(s, insn))) {
         return;
     }