target/mips: Introduce decodetree helpers for Release6 LSA/DLSA opcodes

LSA and LDSA opcodes are also available with MIPS release 6.
Introduce the decodetree config files and call the decode()
helpers in the main decode_opc() loop.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20201215225757.764263-24-f4bug@amsat.org>

target/mips/meson.build

@@ -1,4 +1,6 @@
 gen = [
+  decodetree.process('mips32r6.decode', extra_args: '--static-decode=decode_mips32r6'),
+  decodetree.process('mips64r6.decode', extra_args: '--static-decode=decode_mips64r6'),
   decodetree.process('msa32.decode', extra_args: '--static-decode=decode_msa32'),
   decodetree.process('msa64.decode', extra_args: '--static-decode=decode_msa64'),
 ]
@@ -16,6 +18,7 @@ mips_ss.add(when: 'CONFIG_TCG', if_true: files(
   'msa_helper.c',
   'msa_translate.c',
   'op_helper.c',
+  'rel6_translate.c',
   'tlb_helper.c',
   'translate.c',
   'translate_addr_const.c',

target/mips/mips32r6.decode

@@ -0,0 +1,17 @@
+# MIPS32 Release 6 instruction set
+#
+# Copyright (C) 2020  Philippe Mathieu-Daudé
+#
+# SPDX-License-Identifier: LGPL-2.1-or-later
+#
+# Reference:
+#       MIPS Architecture for Programmers Volume II-A
+#       The MIPS32 Instruction Set Reference Manual, Revision 6.06
+#       (Document Number: MD00086-2B-MIPS32BIS-AFP-06.06)
+#
+
+&rtype              rs rt rd sa
+
+@lsa                ...... rs:5 rt:5 rd:5 ... sa:2 ......   &rtype
+
+LSA                 000000 ..... ..... ..... 000 .. 000101  @lsa

target/mips/mips64r6.decode

@@ -0,0 +1,17 @@
+# MIPS64 Release 6 instruction set
+#
+# Copyright (C) 2020  Philippe Mathieu-Daudé
+#
+# SPDX-License-Identifier: LGPL-2.1-or-later
+#
+# Reference:
+#       MIPS Architecture for Programmers Volume II-A
+#       The MIPS64 Instruction Set Reference Manual, Revision 6.06
+#       (Document Number: MD00087-2B-MIPS64BIS-AFP-6.06)
+#
+
+&rtype              rs rt rd sa !extern
+
+@lsa                ...... rs:5 rt:5 rd:5 ... sa:2 ......   &rtype
+
+DLSA                000000 ..... ..... ..... 000 .. 010101  @lsa

target/mips/rel6_translate.c

@@ -0,0 +1,37 @@
+/*
+ *  MIPS emulation for QEMU - # Release 6 translation routines
+ *
+ *  Copyright (c) 2004-2005 Jocelyn Mayer
+ *  Copyright (c) 2006 Marius Groeger (FPU operations)
+ *  Copyright (c) 2006 Thiemo Seufer (MIPS32R2 support)
+ *  Copyright (c) 2020 Philippe Mathieu-Daudé
+ *
+ * This code is licensed under the GNU GPLv2 and later.
+ */
+
+#include "qemu/osdep.h"
+#include "tcg/tcg-op.h"
+#include "exec/helper-gen.h"
+#include "translate.h"
+
+/* Include the auto-generated decoder.  */
+#include "decode-mips32r6.c.inc"
+#include "decode-mips64r6.c.inc"
+
+static bool trans_LSA(DisasContext *ctx, arg_rtype *a)
+{
+    return gen_lsa(ctx, a->rd, a->rt, a->rs, a->sa);
+}
+
+static bool trans_DLSA(DisasContext *ctx, arg_rtype *a)
+{
+    return gen_dlsa(ctx, a->rd, a->rt, a->rs, a->sa);
+}
+
+bool decode_isa_rel6(DisasContext *ctx, uint32_t insn)
+{
+    if (TARGET_LONG_BITS == 64 && decode_mips64r6(ctx, insn)) {
+        return true;
+    }
+    return decode_mips32r6(ctx, insn);
+}

target/mips/translate.c

@@ -29025,6 +29025,11 @@ static void decode_opc(CPUMIPSState *env, DisasContext *ctx)
         return;
     }
 
+    /* ISA (from latest to oldest) */
+    if (cpu_supports_isa(env, ISA_MIPS_R6) && decode_isa_rel6(ctx, ctx->opcode)) {
+        return;
+    }
+
     if (decode_opc_legacy(env, ctx)) {
         return;
     }

target/mips/translate.h

@@ -171,6 +171,7 @@ extern TCGv bcond;
 void msa_translate_init(void);
 
 /* decodetree generated */
+bool decode_isa_rel6(DisasContext *ctx, uint32_t insn);
 bool decode_ase_msa(DisasContext *ctx, uint32_t insn);
 
 #endif