target/mips: Introduce decodetree structure for NEC Vr54xx extension

The decoder is called but doesn't decode anything. This will
ease reviewing the next commit.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20210801235926.3178085-3-f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

5 files changed, 33 insertions, 0 deletions

diff --git a/target/mips/tcg/meson.build b/target/mips/tcg/meson.build
index ff618a1..8f6f750 100644
--- a/target/mips/tcg/meson.build
+++ b/target/mips/tcg/meson.build
@@ -2,6 +2,7 @@ gen = [
   decodetree.process('rel6.decode', extra_args: ['--decode=decode_isa_rel6']),
   decodetree.process('msa.decode', extra_args: '--decode=decode_ase_msa'),
   decodetree.process('tx79.decode', extra_args: '--static-decode=decode_tx79'),
+  decodetree.process('vr54xx.decode', extra_args: '--decode=decode_ext_vr54xx'),
 ]
 
 mips_ss.add(gen)
@@ -19,6 +20,7 @@ mips_ss.add(files(
   'translate_addr_const.c',
   'txx9_translate.c',
   'vr54xx_helper.c',
+  'vr54xx_translate.c',
 ))
 mips_ss.add(when: 'TARGET_MIPS64', if_true: files(
   'tx79_translate.c',
diff --git a/target/mips/tcg/translate.c b/target/mips/tcg/translate.c
index 490add3..3436363 100644
--- a/target/mips/tcg/translate.c
+++ b/target/mips/tcg/translate.c
@@ -16098,6 +16098,9 @@ static void decode_opc(CPUMIPSState *env, DisasContext *ctx)
     if (cpu_supports_isa(env, INSN_R5900) && decode_ext_txx9(ctx, ctx->opcode)) {
         return;
     }
+    if (cpu_supports_isa(env, INSN_VR54XX) && decode_ext_vr54xx(ctx, ctx->opcode)) {
+        return;
+    }
 
     /* ISA extensions */
     if (ase_msa_available(env) && decode_ase_msa(ctx, ctx->opcode)) {
diff --git a/target/mips/tcg/translate.h b/target/mips/tcg/translate.h
index 791e3e2..bb0a6b8 100644
--- a/target/mips/tcg/translate.h
+++ b/target/mips/tcg/translate.h
@@ -201,6 +201,7 @@ bool decode_ext_txx9(DisasContext *ctx, uint32_t insn);
 #if defined(TARGET_MIPS64)
 bool decode_ext_tx79(DisasContext *ctx, uint32_t insn);
 #endif
+bool decode_ext_vr54xx(DisasContext *ctx, uint32_t insn);
 
 /*
  * Helpers for implementing sets of trans_* functions.
diff --git a/target/mips/tcg/vr54xx.decode b/target/mips/tcg/vr54xx.decode
new file mode 100644
index 0000000..f6b3e42
--- /dev/null
+++ b/target/mips/tcg/vr54xx.decode
@@ -0,0 +1,8 @@
+# MIPS VR5432 instruction set extensions
+#
+# Copyright (C) 2021  Philippe Mathieu-Daudé
+#
+# SPDX-License-Identifier: LGPL-2.1-or-later
+#
+# Reference: VR5432 Microprocessor User’s Manual
+#            (Document Number U13751EU5V0UM00)
diff --git a/target/mips/tcg/vr54xx_translate.c b/target/mips/tcg/vr54xx_translate.c
new file mode 100644
index 0000000..13e58fd
--- /dev/null
+++ b/target/mips/tcg/vr54xx_translate.c
@@ -0,0 +1,19 @@
+/*
+ * VR5432 extensions translation routines
+ *
+ * Reference: VR5432 Microprocessor User’s Manual
+ *            (Document Number U13751EU5V0UM00)
+ *
+ *  Copyright (c) 2021 Philippe Mathieu-Daudé
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "tcg/tcg-op.h"
+#include "exec/helper-gen.h"
+#include "translate.h"
+#include "internal.h"
+
+/* Include the auto-generated decoder. */
+#include "decode-vr54xx.c.inc"