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target/riscv: Convert quadrant 0 of RVXC insns to decodetree 

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
This commit is contained in:
Bastian Koppelmann 2019-02-13 07:53:56 -08:00
parent 4ba79c47a2
commit e98d9140f2
4 changed files with 154 additions and 38 deletions
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9
target/riscv/Makefile.objs
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@ -10,4 +10,11 @@ target/riscv/decode_insn32.inc.c: $(decode32-y) $(DECODETREE)
$(PYTHON) $(DECODETREE) -o $@ --decode decode_insn32 $(decode32-y), \
"GEN", $(TARGET_DIR)$@)
target/riscv/translate.o: target/riscv/decode_insn32.inc.c
target/riscv/decode_insn16.inc.c: \
$(SRC_PATH)/target/riscv/insn16.decode $(DECODETREE)
$(call quiet-command, \
$(PYTHON) $(DECODETREE) -o $@ --decode decode_insn16 --insnwidth 16 $<, \
"GEN", $(TARGET_DIR)$@)
target/riscv/translate.o: target/riscv/decode_insn32.inc.c \
target/riscv/decode_insn16.inc.c

55
target/riscv/insn16.decode Normal file
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@ -0,0 +1,55 @@
#
# RISC-V translation routines for the RVXI Base Integer Instruction Set.
#
# Copyright (c) 2018 Peer Adelt, peer.adelt@hni.uni-paderborn.de
# Bastian Koppelmann, kbastian@mail.uni-paderborn.de
#
# 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
%rs1_3 7:3 !function=ex_rvc_register
%rs2_3 2:3 !function=ex_rvc_register
# Immediates:
%nzuimm_ciw 7:4 11:2 5:1 6:1 !function=ex_shift_2
%uimm_cl_d 5:2 10:3 !function=ex_shift_3
%uimm_cl_w 5:1 10:3 6:1 !function=ex_shift_2
# Argument sets:
&cl rs1 rd
&cl_dw uimm rs1 rd
&ciw nzuimm rd
&cs rs1 rs2
&cs_dw uimm rs1 rs2
# Formats 16:
@ciw ... ........ ... .. &ciw nzuimm=%nzuimm_ciw rd=%rs2_3
@cl_d ... ... ... .. ... .. &cl_dw uimm=%uimm_cl_d rs1=%rs1_3 rd=%rs2_3
@cl_w ... ... ... .. ... .. &cl_dw uimm=%uimm_cl_w rs1=%rs1_3 rd=%rs2_3
@cl ... ... ... .. ... .. &cl rs1=%rs1_3 rd=%rs2_3
@cs ... ... ... .. ... .. &cs rs1=%rs1_3 rs2=%rs2_3
@cs_d ... ... ... .. ... .. &cs_dw uimm=%uimm_cl_d rs1=%rs1_3 rs2=%rs2_3
@cs_w ... ... ... .. ... .. &cs_dw uimm=%uimm_cl_w rs1=%rs1_3 rs2=%rs2_3
# *** RV64C Standard Extension (Quadrant 0) ***
c_addi4spn 000 ........ ... 00 @ciw
c_fld 001 ... ... .. ... 00 @cl_d
c_lw 010 ... ... .. ... 00 @cl_w
c_flw_ld 011 --- ... -- ... 00 @cl #Note: Must parse uimm manually
c_fsd 101 ... ... .. ... 00 @cs_d
c_sw 110 ... ... .. ... 00 @cs_w
c_fsw_sd 111 --- ... -- ... 00 @cs #Note: Must parse uimm manually

75
target/riscv/insn_trans/trans_rvc.inc.c Normal file
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@ -0,0 +1,75 @@
/*
* RISC-V translation routines for the RVC Compressed Instruction Set.
*
* Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu
* Copyright (c) 2018 Peer Adelt, peer.adelt@hni.uni-paderborn.de
* Bastian Koppelmann, kbastian@mail.uni-paderborn.de
*
* 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_c_addi4spn(DisasContext *ctx, arg_c_addi4spn *a)
{
if (a->nzuimm == 0) {
/* Reserved in ISA */
return false;
}
arg_addi arg = { .rd = a->rd, .rs1 = 2, .imm = a->nzuimm };
return trans_addi(ctx, &arg);
}
static bool trans_c_fld(DisasContext *ctx, arg_c_fld *a)
{
arg_fld arg = { .rd = a->rd, .rs1 = a->rs1, .imm = a->uimm };
return trans_fld(ctx, &arg);
}
static bool trans_c_lw(DisasContext *ctx, arg_c_lw *a)
{
arg_lw arg = { .rd = a->rd, .rs1 = a->rs1, .imm = a->uimm };
return trans_lw(ctx, &arg);
}
static bool trans_c_flw_ld(DisasContext *ctx, arg_c_flw_ld *a)
{
#ifdef TARGET_RISCV32
/* C.FLW ( RV32FC-only ) */
return false;
#else
/* C.LD ( RV64C/RV128C-only ) */
return false;
#endif
}
static bool trans_c_fsd(DisasContext *ctx, arg_c_fsd *a)
{
arg_fsd arg = { .rs1 = a->rs1, .rs2 = a->rs2, .imm = a->uimm };
return trans_fsd(ctx, &arg);
}
static bool trans_c_sw(DisasContext *ctx, arg_c_sw *a)
{
arg_sw arg = { .rs1 = a->rs1, .rs2 = a->rs2, .imm = a->uimm };
return trans_sw(ctx, &arg);
}
static bool trans_c_fsw_sd(DisasContext *ctx, arg_c_fsw_sd *a)
{
#ifdef TARGET_RISCV32
/* C.FSW ( RV32FC-only ) */
return false;
#else
/* C.SD ( RV64C/RV128C-only ) */
return false;
#endif
}

53
target/riscv/translate.c
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@ -803,27 +803,6 @@ static void decode_RV32_64C0(DisasContext *ctx)
uint8_t rs1s = GET_C_RS1S(ctx->opcode);
switch (funct3) {
case 0:
/* illegal */
if (ctx->opcode == 0) {
gen_exception_illegal(ctx);
} else {
/* C.ADDI4SPN -> addi rd', x2, zimm[9:2]*/
gen_arith_imm(ctx, OPC_RISC_ADDI, rd_rs2, 2,
GET_C_ADDI4SPN_IMM(ctx->opcode));
}
break;
case 1:
/* C.FLD -> fld rd', offset[7:3](rs1')*/
gen_fp_load(ctx, OPC_RISC_FLD, rd_rs2, rs1s,
GET_C_LD_IMM(ctx->opcode));
/* C.LQ(RV128) */
break;
case 2:
/* C.LW -> lw rd', offset[6:2](rs1') */
gen_load(ctx, OPC_RISC_LW, rd_rs2, rs1s,
GET_C_LW_IMM(ctx->opcode));
break;
case 3:
#if defined(TARGET_RISCV64)
/* C.LD(RV64/128) -> ld rd', offset[7:3](rs1')*/
@ -835,21 +814,6 @@ static void decode_RV32_64C0(DisasContext *ctx)
GET_C_LW_IMM(ctx->opcode));
#endif
break;
case 4:
/* reserved */
gen_exception_illegal(ctx);
break;
case 5:
/* C.FSD(RV32/64) -> fsd rs2', offset[7:3](rs1') */
gen_fp_store(ctx, OPC_RISC_FSD, rs1s, rd_rs2,
GET_C_LD_IMM(ctx->opcode));
/* C.SQ (RV128) */
break;
case 6:
/* C.SW -> sw rs2', offset[6:2](rs1')*/
gen_store(ctx, OPC_RISC_SW, rs1s, rd_rs2,
GET_C_LW_IMM(ctx->opcode));
break;
case 7:
#if defined(TARGET_RISCV64)
/* C.SD (RV64/128) -> sd rs2', offset[7:3](rs1')*/
@ -1079,6 +1043,8 @@ static void decode_RV32_64C(DisasContext *ctx)
return imm << amount; \
}
EX_SH(1)
EX_SH(2)
EX_SH(3)
EX_SH(12)
#define REQUIRE_EXT(ctx, ext) do { \
@ -1087,6 +1053,11 @@ EX_SH(12)
} \
} while (0)
static int ex_rvc_register(int reg)
{
return 8 + reg;
}
bool decode_insn32(DisasContext *ctx, uint32_t insn);
/* Include the auto-generated decoder for 32 bit insn */
#include "decode_insn32.inc.c"
@ -1098,6 +1069,11 @@ bool decode_insn32(DisasContext *ctx, uint32_t insn);
#include "insn_trans/trans_rvd.inc.c"
#include "insn_trans/trans_privileged.inc.c"
bool decode_insn16(DisasContext *ctx, uint16_t insn);
/* auto-generated decoder*/
#include "decode_insn16.inc.c"
#include "insn_trans/trans_rvc.inc.c"
static void decode_RV32_64G(DisasContext *ctx)
{
int rs1, rd;
@ -1131,7 +1107,10 @@ static void decode_opc(DisasContext *ctx)
gen_exception_illegal(ctx);
} else {
ctx->pc_succ_insn = ctx->base.pc_next + 2;
decode_RV32_64C(ctx);
if (!decode_insn16(ctx, ctx->opcode)) {
/* fall back to old decoder */
decode_RV32_64C(ctx);
}
}
} else {
ctx->pc_succ_insn = ctx->base.pc_next + 4;