target/riscv/Makefile.objs | 10 +++++++
target/riscv/insn32.decode | 30 +++++++++++++++++++++
target/riscv/insn_trans/trans_rvi.inc.c | 35 +++++++++++++++++++++++++
target/riscv/translate.c | 24 ++++++++++++-----
4 files changed, 92 insertions(+), 7 deletions(-)
create mode 100644 target/riscv/insn32.decode
create mode 100644 target/riscv/insn_trans/trans_rvi.inc.c
diff --git a/target/riscv/Makefile.objs b/target/riscv/Makefile.objs
index abd0a7cde3..ea02f9b9ef 100644
--- a/target/riscv/Makefile.objs
+++ b/target/riscv/Makefile.objs
@@ -1 +1,11 @@
obj-y += translate.o op_helper.o helper.o cpu.o fpu_helper.o gdbstub.o pmp.o
+
+DECODETREE = $(SRC_PATH)/scripts/decodetree.py
+
+target/riscv/decode_insn32.inc.c: \
+ $(SRC_PATH)/target/riscv/insn32.decode $(DECODETREE)
+ $(call quiet-command, \
+ $(PYTHON) $(DECODETREE) -o $@ --decode decode_insn32 $<, \
+ "GEN", $(TARGET_DIR)$@)
+
+target/riscv/translate.o: target/riscv/decode_insn32.inc.c
diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode
new file mode 100644
index 0000000000..44d4e922b6
--- /dev/null
+++ b/target/riscv/insn32.decode
@@ -0,0 +1,30 @@
+#
+# RISC-V translation routines for the RVXI Base Integer Instruction Set.
+#
+# Copyright (c) 2018 Peer Adelt, address@hidden
+# Bastian Koppelmann, address@hidden
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms and conditions of the GNU General Public License,
+# version 2 or later, as published by the Free Software Foundation.
+#
+# This program is distributed in the hope it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program. If not, see <http://www.gnu.org/licenses/>.
+
+# Fields:
+%rd 7:5
+
+# immediates:
+%imm_u 12:s20 !function=ex_shift_12
+
+# Formats 32:
address@hidden .................... ..... ....... imm=%imm_u
%rd
+
+# *** RV32I Base Instruction Set ***
+lui .................... ..... 0110111 @u
+auipc .................... ..... 0010111 @u
diff --git a/target/riscv/insn_trans/trans_rvi.inc.c
b/target/riscv/insn_trans/trans_rvi.inc.c
new file mode 100644
index 0000000000..aee0d1637d
--- /dev/null
+++ b/target/riscv/insn_trans/trans_rvi.inc.c
@@ -0,0 +1,35 @@
+/*
+ * RISC-V translation routines for the RVXI Base Integer Instruction Set.
+ *
+ * Copyright (c) 2016-2017 Sagar Karandikar, address@hidden
+ * Copyright (c) 2018 Peer Adelt, address@hidden
+ * Bastian Koppelmann, address@hidden
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2 or later, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+static bool trans_lui(DisasContext *ctx, arg_lui *a, uint32_t insn)
+{
+ if (a->rd != 0) {
+ tcg_gen_movi_tl(cpu_gpr[a->rd], a->imm);
+ }
+ return true;
+}
+
+static bool trans_auipc(DisasContext *ctx, arg_auipc *a, uint32_t insn)
+{
+ if (a->rd != 0) {
+ tcg_gen_movi_tl(cpu_gpr[a->rd], a->imm + ctx->base.pc_next);
+ }
+ return true;
+}
diff --git a/target/riscv/translate.c b/target/riscv/translate.c
index e81b9f097e..65a323a201 100644
--- a/target/riscv/translate.c
+++ b/target/riscv/translate.c
@@ -1667,6 +1667,19 @@ static void decode_RV32_64C(CPURISCVState *env,
DisasContext *ctx)
}
}
+#define EX_SH(amount) \
+ static int32_t ex_shift_##amount(int imm) \
+ { \
+ return imm << amount; \
+ }
+EX_SH(12)
+
+bool decode_insn32(DisasContext *ctx, uint32_t insn);
+/* Include the auto-generated decoder for 32 bit insn */
+#include "decode_insn32.inc.c"
+/* Include insn module translation function */
+#include "insn_trans/trans_rvi.inc.c"
+
static void decode_RV32_64G(CPURISCVState *env, DisasContext *ctx)
{
int rs1;
@@ -1687,12 +1700,6 @@ static void decode_RV32_64G(CPURISCVState *env,
DisasContext *ctx)
imm = GET_IMM(ctx->opcode);
switch (op) {
- case OPC_RISC_LUI:
- if (rd == 0) {
- break; /* NOP */
- }
- tcg_gen_movi_tl(cpu_gpr[rd], sextract64(ctx->opcode, 12, 20) << 12);
- break;
case OPC_RISC_AUIPC:
if (rd == 0) {
break; /* NOP */
@@ -1802,7 +1809,10 @@ static void decode_opc(DisasContext *ctx)
}
} else {
ctx->pc_succ_insn = ctx->base.pc_next + 4;
- decode_RV32_64G(ctx->env, ctx);
+ if (!decode_insn32(ctx, ctx->opcode)) {
+ /* fallback to old decoder */
+ decode_RV32_64G(ctx->env, ctx);
+ }
}
}