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+// -*- mode:c++ -*-
+
+// Copyright (c) 2015 RISC-V Foundation
+// Copyright (c) 2016 The University of Virginia
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met: redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer;
+// redistributions in binary form must reproduce the above copyright
+// notice, this list of conditions and the following disclaimer in the
+// documentation and/or other materials provided with the distribution;
+// neither the name of the copyright holders nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Authors: Alec Roelke
+
+////////////////////////////////////////////////////////////////////
+//
+// The RISC-V ISA decoder
+//
+
+decode OPCODE default Unknown::unknown() {
+ 0x03: decode FUNCT3 {
+ format Load {
+ 0x0: lb({{
+ Rd_sd = Mem_sb;
+ }});
+ 0x1: lh({{
+ Rd_sd = Mem_sh;
+ }});
+ 0x2: lw({{
+ Rd_sd = Mem_sw;
+ }});
+ 0x3: ld({{
+ Rd_sd = Mem_sd;
+ }});
+ 0x4: lbu({{
+ Rd = Mem_ub;
+ }});
+ 0x5: lhu({{
+ Rd = Mem_uh;
+ }});
+ 0x6: lwu({{
+ Rd = Mem_uw;
+ }});
+ }
+ }
+
+ 0x0f: decode FUNCT3 {
+ format IOp {
+ 0x0: fence({{
+ }}, IsNonSpeculative, IsMemBarrier, No_OpClass);
+ 0x1: fence_i({{
+ }}, IsNonSpeculative, IsSerializeAfter, No_OpClass);
+ }
+ }
+
+ 0x13: decode FUNCT3 {
+ format IOp {
+ 0x0: addi({{
+ Rd_sd = Rs1_sd + imm;
+ }});
+ 0x1: slli({{
+ Rd = Rs1 << SHAMT6;
+ }});
+ 0x2: slti({{
+ Rd = (Rs1_sd < imm) ? 1 : 0;
+ }});
+ 0x3: sltiu({{
+ Rd = (Rs1 < (uint64_t)imm) ? 1 : 0;
+ }});
+ 0x4: xori({{
+ Rd = Rs1 ^ (uint64_t)imm;
+ }});
+ 0x5: decode SRTYPE {
+ 0x0: srli({{
+ Rd = Rs1 >> SHAMT6;
+ }});
+ 0x1: srai({{
+ Rd_sd = Rs1_sd >> SHAMT6;
+ }});
+ }
+ 0x6: ori({{
+ Rd = Rs1 | (uint64_t)imm;
+ }});
+ 0x7: andi({{
+ Rd = Rs1 & (uint64_t)imm;
+ }});
+ }
+ }
+
+ 0x17: UOp::auipc({{
+ Rd = PC + imm;
+ }});
+
+ 0x1b: decode FUNCT3 {
+ format IOp {
+ 0x0: addiw({{
+ Rd_sd = (int32_t)Rs1 + (int32_t)imm;
+ }});
+ 0x1: slliw({{
+ Rd_sd = Rs1_sw << SHAMT5;
+ }});
+ 0x5: decode SRTYPE {
+ 0x0: srliw({{
+ Rd = Rs1_uw >> SHAMT5;
+ }});
+ 0x1: sraiw({{
+ Rd_sd = Rs1_sw >> SHAMT5;
+ }});
+ }
+ }
+ }
+
+ 0x23: decode FUNCT3 {
+ format Store {
+ 0x0: sb({{
+ Mem_ub = Rs2_ub;
+ }});
+ 0x1: sh({{
+ Mem_uh = Rs2_uh;
+ }});
+ 0x2: sw({{
+ Mem_uw = Rs2_uw;
+ }});
+ 0x3: sd({{
+ Mem_ud = Rs2_ud;
+ }});
+ }
+ }
+
+ 0x33: decode FUNCT3 {
+ format ROp {
+ 0x0: decode FUNCT7 {
+ 0x0: add({{
+ Rd = Rs1_sd + Rs2_sd;
+ }});
+ 0x20: sub({{
+ Rd = Rs1_sd - Rs2_sd;
+ }});
+ }
+ 0x1: decode FUNCT7 {
+ 0x0: sll({{
+ Rd = Rs1 << Rs2<5:0>;
+ }});
+ }
+ 0x2: decode FUNCT7 {
+ 0x0: slt({{
+ Rd = (Rs1_sd < Rs2_sd) ? 1 : 0;
+ }});
+ }
+ 0x3: decode FUNCT7 {
+ 0x0: sltu({{
+ Rd = (Rs1 < Rs2) ? 1 : 0;
+ }});
+ }
+ 0x4: decode FUNCT7 {
+ 0x0: xor({{
+ Rd = Rs1 ^ Rs2;
+ }});
+ }
+ 0x5: decode FUNCT7 {
+ 0x0: srl({{
+ Rd = Rs1 >> Rs2<5:0>;
+ }});
+ 0x20: sra({{
+ Rd_sd = Rs1_sd >> Rs2<5:0>;
+ }});
+ }
+ 0x6: decode FUNCT7 {
+ 0x0: or({{
+ Rd = Rs1 | Rs2;
+ }});
+ }
+ 0x7: decode FUNCT7 {
+ 0x0: and({{
+ Rd = Rs1 & Rs2;
+ }});
+ }
+ }
+ }
+
+ 0x37: UOp::lui({{
+ Rd = (uint64_t)imm;
+ }});
+
+ 0x3b: decode FUNCT3 {
+ format ROp {
+ 0x0: decode FUNCT7 {
+ 0x0: addw({{
+ Rd_sd = Rs1_sw + Rs2_sw;
+ }});
+ 0x20: subw({{
+ Rd_sd = Rs1_sw - Rs2_sw;
+ }});
+ }
+ 0x1: sllw({{
+ Rd_sd = Rs1_sw << Rs2<4:0>;
+ }});
+ 0x5: decode FUNCT7 {
+ 0x0: srlw({{
+ Rd_uw = Rs1_uw >> Rs2<4:0>;
+ }});
+ 0x20: sraw({{
+ Rd_sd = Rs1_sw >> Rs2<4:0>;
+ }});
+ }
+ }
+ }
+
+ 0x63: decode FUNCT3 {
+ format SBOp {
+ 0x0: beq({{
+ if (Rs1 == Rs2) {
+ NPC = PC + imm;
+ } else {
+ NPC = NPC;
+ }
+ }}, IsDirectControl, IsCondControl);
+ 0x1: bne({{
+ if (Rs1 != Rs2) {
+ NPC = PC + imm;
+ } else {
+ NPC = NPC;
+ }
+ }}, IsDirectControl, IsCondControl);
+ 0x4: blt({{
+ if (Rs1_sd < Rs2_sd) {
+ NPC = PC + imm;
+ } else {
+ NPC = NPC;
+ }
+ }}, IsDirectControl, IsCondControl);
+ 0x5: bge({{
+ if (Rs1_sd >= Rs2_sd) {
+ NPC = PC + imm;
+ } else {
+ NPC = NPC;
+ }
+ }}, IsDirectControl, IsCondControl);
+ 0x6: bltu({{
+ if (Rs1 < Rs2) {
+ NPC = PC + imm;
+ } else {
+ NPC = NPC;
+ }
+ }}, IsDirectControl, IsCondControl);
+ 0x7: bgeu({{
+ if (Rs1 >= Rs2) {
+ NPC = PC + imm;
+ } else {
+ NPC = NPC;
+ }
+ }}, IsDirectControl, IsCondControl);
+ }
+ }
+
+ 0x67: decode FUNCT3 {
+ 0x0: Jump::jalr({{
+ Rd = NPC;
+ NPC = (imm + Rs1) & (~0x1);
+ }}, IsIndirectControl, IsUncondControl, IsCall);
+ }
+
+ 0x6f: UJOp::jal({{
+ Rd = NPC;
+ NPC = PC + imm;
+ }}, IsDirectControl, IsUncondControl, IsCall);
+
+ 0x73: decode FUNCT3 {
+ format IOp {
+ 0x0: decode FUNCT12 {
+ 0x0: ecall({{
+ fault = std::make_shared<SyscallFault>();
+ }}, IsSerializeAfter, IsNonSpeculative, IsSyscall, No_OpClass);
+ 0x1: ebreak({{
+ fault = std::make_shared<BreakpointFault>();
+ }}, IsSerializeAfter, IsNonSpeculative, No_OpClass);
+ 0x100: eret({{
+ fault = std::make_shared<UnimplementedFault>("eret");
+ }}, No_OpClass);
+ }
+ 0x1: csrrw({{
+ Rd = xc->readMiscReg(FUNCT12);
+ xc->setMiscReg(FUNCT12, Rs1);
+ }}, IsNonSpeculative, No_OpClass);
+ 0x2: csrrs({{
+ Rd = xc->readMiscReg(FUNCT12);
+ if (Rs1 != 0) {
+ xc->setMiscReg(FUNCT12, Rd | Rs1);
+ }
+ }}, IsNonSpeculative, No_OpClass);
+ 0x3: csrrc({{
+ Rd = xc->readMiscReg(FUNCT12);
+ if (Rs1 != 0) {
+ xc->setMiscReg(FUNCT12, Rd & ~Rs1);
+ }
+ }}, IsNonSpeculative, No_OpClass);
+ 0x5: csrrwi({{
+ Rd = xc->readMiscReg(FUNCT12);
+ xc->setMiscReg(FUNCT12, ZIMM);
+ }}, IsNonSpeculative, No_OpClass);
+ 0x6: csrrsi({{
+ Rd = xc->readMiscReg(FUNCT12);
+ if (ZIMM != 0) {
+ xc->setMiscReg(FUNCT12, Rd | ZIMM);
+ }
+ }}, IsNonSpeculative, No_OpClass);
+ 0x7: csrrci({{
+ Rd = xc->readMiscReg(FUNCT12);
+ if (ZIMM != 0) {
+ xc->setMiscReg(FUNCT12, Rd & ~ZIMM);
+ }
+ }}, IsNonSpeculative, No_OpClass);
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-26 00:09:56 +0000