396 lines
13 KiB
Plaintext
396 lines
13 KiB
Plaintext
// SPDX-License-Identifier: Apache-2.0
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// Copyright 2019 Western Digital Corporation or its affiliates.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Run time disassembler functions
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// supports RISCV extentions I, C, M, A
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`ifndef RV_NUM_THREADS
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`define RV_NUM_THREADS 1
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`endif
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bit[31:0] [31:0] gpr[`RV_NUM_THREADS];
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// main DASM function
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function string dasm(input[31:0] opcode, input[31:0] pc, input[4:0] regn, input[31:0] regv, input tid=0);
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dasm = (opcode[1:0] == 2'b11) ? dasm32(opcode, pc, tid) : dasm16(opcode, pc, tid);
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if(regn) gpr[tid][regn] = regv;
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endfunction
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///////////////// 16 bits instructions ///////////////////////
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function string dasm16( input[31:0] opcode, input[31:0] pc, input tid=0);
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case(opcode[1:0])
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0: return dasm16_0(opcode, tid);
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1: return dasm16_1(opcode, pc);
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2: return dasm16_2(opcode);
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endcase
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return $sformatf(".short 0x%h", opcode[15:0]);
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endfunction
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function string dasm16_0( input[31:0] opcode, tid);
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case(opcode[15:13])
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3'b000: return dasm16_ciw(opcode);
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3'b001: return {"c.fld ", dasm16_cl(opcode, tid)};
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3'b010: return {"c.lw ", dasm16_cl(opcode, tid)};
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3'b011: return {"c.flw ", dasm16_cl(opcode, tid)};
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3'b101: return {"c.fsd ", dasm16_cl(opcode, tid)};
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3'b110: return {"c.sw ", dasm16_cl(opcode, tid)};
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3'b111: return {"c.fsw ", dasm16_cl(opcode, tid)};
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endcase
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return $sformatf(".short 0x%h", opcode[15:0]);
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endfunction
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function string dasm16_ciw( input[31:0] opcode);
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int imm;
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imm=0;
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if(opcode[15:0] == 0) return ".short 0";
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{imm[5:4],imm[9:6],imm[2],imm[3]} = opcode[12:5];
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return $sformatf("c.addi4spn %s,0x%0h", abi_reg[opcode[4:2]+8], imm);
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endfunction
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function string dasm16_cl( input[31:0] opcode, input tid=0);
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int imm;
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imm=0;
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imm[5:3] = opcode[12:10];
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imm[7:6] = opcode[6:5];
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return $sformatf(" %s,%0d(%s) [%h]", abi_reg[opcode[4:2]+8], imm, abi_reg[opcode[9:7]+8], gpr[tid][opcode[9:7]+8]+imm);
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endfunction
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function string dasm16_1( input[31:0] opcode, input[31:0] pc);
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case(opcode[15:13])
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3'b000: return opcode[11:7]==0 ? "c.nop" : {"c.addi ",dasm16_ci(opcode)};
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3'b001: return {"c.jal ", dasm16_cj(opcode, pc)};
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3'b010: return {"c.li ", dasm16_ci(opcode)};
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3'b011: return dasm16_1_3(opcode);
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3'b100: return dasm16_cr(opcode);
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3'b101: return {"c.j ", dasm16_cj(opcode, pc)};
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3'b110: return {"c.beqz ", dasm16_cb(opcode, pc)};
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3'b111: return {"c.bnez ", dasm16_cb(opcode, pc)};
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endcase
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endfunction
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function string dasm16_ci( input[31:0] opcode);
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int imm;
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imm=0;
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imm[4:0] = opcode[6:2];
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if(opcode[12]) imm [31:5] = '1;
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return $sformatf("%s,%0d", abi_reg[opcode[11:7]], imm);
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endfunction
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function string dasm16_cj( input[31:0] opcode, input[31:0] pc);
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bit[31:0] imm;
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imm=0;
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{imm[11],imm[4],imm[9:8],imm[10],imm[6], imm[7],imm[3:1], imm[5]} = opcode[12:2];
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if(opcode[12]) imm [31:12] = '1;
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return $sformatf("0x%0h", imm+pc);
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endfunction
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function string dasm16_cb( input[31:0] opcode, input[31:0] pc);
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bit[31:0] imm;
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imm=0;
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{imm[8],imm[4:3]} = opcode[12:10];
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{imm[7:6],imm[2:1], imm[5]} = opcode[6:2];
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if(opcode[12]) imm [31:9] = '1;
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return $sformatf("%s,0x%0h",abi_reg[opcode[9:7]+8], imm+pc);
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endfunction
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function string dasm16_cr( input[31:0] opcode);
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bit[31:0] imm;
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imm = 0;
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imm[4:0] = opcode[6:2];
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if(opcode[5]) imm [31:5] = '1;
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case(opcode[11:10])
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0: return $sformatf("c.srli %s,%0d", abi_reg[opcode[9:7]+8], imm[5:0]);
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1: return $sformatf("c.srai %s,%0d", abi_reg[opcode[9:7]+8], imm[5:0]);
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2: return $sformatf("c.andi %s,0x%0h", abi_reg[opcode[9:7]+8], imm);
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endcase
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case(opcode[6:5])
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0: return $sformatf("c.sub %s,%s", abi_reg[opcode[9:7]+8], abi_reg[opcode[4:2]+8]);
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1: return $sformatf("c.xor %s,%s", abi_reg[opcode[9:7]+8], abi_reg[opcode[4:2]+8]);
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2: return $sformatf("c.or %s,%s", abi_reg[opcode[9:7]+8], abi_reg[opcode[4:2]+8]);
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3: return $sformatf("c.and %s,%s", abi_reg[opcode[9:7]+8], abi_reg[opcode[4:2]+8]);
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endcase
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endfunction
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function string dasm16_1_3( input[31:0] opcode);
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int imm;
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imm=0;
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if(opcode[11:7] == 2) begin
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{imm[4], imm[6],imm[8:7], imm[5]} = opcode[6:2];
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if(opcode[12]) imm [31:9] = '1;
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return $sformatf("c.addi16sp %0d", imm);
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end
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else begin
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imm[16:12] = opcode[6:2];
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if(opcode[12]) imm [31:17] = '1;
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return $sformatf("c.lui %s,0x%0h", abi_reg[opcode[11:7]], imm);
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end
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endfunction
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function string dasm16_2( input[31:0] opcode, input tid=0);
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case(opcode[15:13])
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3'b000: return {"c.slli ", dasm16_ci(opcode)};
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3'b001: return {"c.fldsp ", dasm16_cls(opcode,1,tid)};
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3'b010: return {"c.lwsp ", dasm16_cls(opcode,0,tid)};
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3'b011: return {"c.flwsp ", dasm16_cls(opcode,0,tid)};
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3'b101: return {"c.fsdsp ", dasm16_css(opcode,1,tid)};
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3'b110: return {"c.swsp ", dasm16_css(opcode,0,tid)};
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3'b111: return {"c.fswsp ", dasm16_css(opcode,0,tid)};
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endcase
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if(opcode[12]) begin
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if(opcode[12:2] == 0) return "c.ebreak";
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else if(opcode[6:2] == 0) return $sformatf("c.jalr %s", abi_reg[opcode[11:7]]);
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else return $sformatf("c.add %s,%s", abi_reg[opcode[11:7]], abi_reg[opcode[6:2]]);
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end
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else begin
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if(opcode[6:2] == 0) return $sformatf("c.jr %s", abi_reg[opcode[11:7]]);
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else return $sformatf("c.mv %s,%s", abi_reg[opcode[11:7]], abi_reg[opcode[6:2]]);
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end
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endfunction
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function string dasm16_cls( input[31:0] opcode, input sh1=0, tid=0);
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bit[31:0] imm;
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imm=0;
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if(sh1) {imm[4:3],imm[8:6]} = opcode[6:2];
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else {imm[4:2],imm[7:6]} = opcode[6:2];
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imm[5] = opcode[12];
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return $sformatf("%s,0x%0h [%h]", abi_reg[opcode[11:7]], imm, gpr[tid][2]+imm);
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endfunction
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function string dasm16_css( input[31:0] opcode, input sh1=0, tid=0);
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bit[31:0] imm;
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imm=0;
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if(sh1) {imm[5:3],imm[8:6]} = opcode[12:7];
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else {imm[5:2],imm[7:6]} = opcode[12:7];
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return $sformatf("%s,0x%0h [%h]", abi_reg[opcode[6:2]], imm, gpr[tid][2]+imm);
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endfunction
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///////////////// 32 bit instructions ///////////////////////
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function string dasm32( input[31:0] opcode, input[31:0] pc, input tid=0);
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case(opcode[6:0])
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7'b0110111: return {"lui ", dasm32_u(opcode)};
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7'b0010111: return {"auipc ", dasm32_u(opcode)};
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7'b1101111: return {"jal ", dasm32_j(opcode,pc)};
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7'b1100111: return {"jalr ", dasm32_jr(opcode,pc)};
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7'b1100011: return dasm32_b(opcode,pc);
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7'b0000011: return dasm32_l(opcode,tid);
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7'b0100011: return dasm32_s(opcode,tid);
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7'b0010011: return dasm32_ai(opcode);
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7'b0110011: return dasm32_ar(opcode);
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7'b0001111: return {"fence", dasm32_fence(opcode)};
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7'b1110011: return dasm32_e(opcode);
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7'b0101111: return dasm32_a(opcode,tid);
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endcase
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return $sformatf(".long 0x%h", opcode);
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endfunction
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function string dasm32_u( input[31:0] opcode);
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bit[31:0] imm;
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imm=0;
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imm[31:12] = opcode[31:12];
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return $sformatf("%s,0x%0h", abi_reg[opcode[11:7]], imm);
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endfunction
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function string dasm32_j( input[31:0] opcode, input[31:0] pc);
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int imm;
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imm=0;
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{imm[20], imm[10:1], imm[11], imm[19:12]} = opcode[31:12];
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if(opcode[31]) imm[31:20] = '1;
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return $sformatf("%s,0x%0h",abi_reg[opcode[11:7]], imm+pc);
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endfunction
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function string dasm32_jr( input[31:0] opcode, input[31:0] pc);
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int imm;
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imm=0;
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imm[11:1] = opcode[31:19];
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if(opcode[31]) imm[31:12] = '1;
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return $sformatf("%s,%s,0x%0h",abi_reg[opcode[11:7]], abi_reg[opcode[19:15]], imm+pc);
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endfunction
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function string dasm32_b( input[31:0] opcode, input[31:0] pc);
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int imm;
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string mn;
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imm=0;
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{imm[12],imm[10:5]} = opcode[31:25];
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{imm[4:1],imm[11]} = opcode[11:7];
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if(opcode[31]) imm[31:12] = '1;
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case(opcode[14:12])
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0: mn = "beq ";
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1: mn = "bne ";
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2,3 : return $sformatf(".long 0x%h", opcode);
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4: mn = "blt ";
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5: mn = "bge ";
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6: mn = "bltu ";
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7: mn = "bgeu ";
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endcase
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return $sformatf("%s%s,%s,0x%0h", mn, abi_reg[opcode[19:15]], abi_reg[opcode[24:20]], imm+pc);
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endfunction
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function string dasm32_l( input[31:0] opcode, input tid=0);
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int imm;
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string mn;
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imm=0;
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imm[11:0] = opcode[31:20];
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if(opcode[31]) imm[31:12] = '1;
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case(opcode[14:12])
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0: mn = "lb ";
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1: mn = "lh ";
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2: mn = "lw ";
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4: mn = "lbu ";
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5: mn = "lhu ";
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default : return $sformatf(".long 0x%h", opcode);
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endcase
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return $sformatf("%s%s,%0d(%s) [%h]", mn, abi_reg[opcode[11:7]], imm, abi_reg[opcode[19:15]], imm+gpr[tid][opcode[19:15]]);
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endfunction
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function string dasm32_s( input[31:0] opcode, input tid=0);
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int imm;
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string mn;
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imm=0;
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imm[11:5] = opcode[31:25];
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imm[4:0] = opcode[11:7];
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if(opcode[31]) imm[31:12] = '1;
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case(opcode[14:12])
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0: mn = "sb ";
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1: mn = "sh ";
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2: mn = "sw ";
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default : return $sformatf(".long 0x%h", opcode);
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endcase
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return $sformatf("%s%s,%0d(%s) [%h]", mn, abi_reg[opcode[24:20]], imm, abi_reg[opcode[19:15]], imm+gpr[tid][opcode[19:15]]);
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endfunction
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function string dasm32_ai( input[31:0] opcode);
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int imm;
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string mn;
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imm=0;
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imm[11:0] = opcode[31:20];
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if(opcode[31]) imm[31:12] = '1;
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case(opcode[14:12])
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0: mn = "addi ";
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2: mn = "slti ";
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3: mn = "sltiu ";
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4: mn = "xori ";
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6: mn = "ori ";
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7: mn = "andi ";
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default: return dasm32_si(opcode);
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endcase
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return $sformatf("%s%s,%s,%0d", mn, abi_reg[opcode[11:7]], abi_reg[opcode[19:15]], imm);
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endfunction
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function string dasm32_si( input[31:0] opcode);
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int imm;
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string mn;
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imm = opcode[24:20];
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case(opcode[14:12])
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1: mn = "slli";
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5: mn = opcode[30] ? "srli": "srai";
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endcase
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return $sformatf("%s %s,%s,%0d", mn, abi_reg[opcode[11:7]], abi_reg[opcode[19:15]], imm);
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endfunction
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function string dasm32_ar( input[31:0] opcode);
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string mn;
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if(opcode[25])
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case(opcode[14:12])
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0: mn = "mul ";
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1: mn = "mulh ";
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2: mn = "mulhsu ";
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3: mn = "mulhu ";
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4: mn = "div ";
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5: mn = "divu ";
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6: mn = "rem ";
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7: mn = "remu ";
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endcase
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else
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case(opcode[14:12])
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0: mn = opcode[30]? "sub ":"add ";
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1: mn = "sll ";
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2: mn = "slt ";
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3: mn = "sltu ";
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4: mn = "xor ";
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5: mn = opcode[30]? "sra ":"srl ";
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6: mn = "or ";
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7: mn = "and ";
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endcase
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return $sformatf("%s%s,%s,%s", mn, abi_reg[opcode[11:7]], abi_reg[opcode[19:15]], abi_reg[opcode[24:20]]);
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endfunction
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function string dasm32_fence( input[31:0] opcode);
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return opcode[12] ? ".i" : "";
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endfunction
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function string dasm32_e(input[31:0] opcode);
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if(opcode[31:7] == 0) return "ecall";
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else if({opcode[31:21],opcode [19:7]} == 0) return "ebreak";
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else
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case(opcode[14:12])
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1: return {"csrrw ", dasm32_csr(opcode)};
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2: return {"csrrs ", dasm32_csr(opcode)};
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3: return {"csrrc ", dasm32_csr(opcode)};
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5: return {"csrrwi ", dasm32_csr(opcode, 1)};
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6: return {"csrrsi ", dasm32_csr(opcode, 1)};
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7: return {"csrrci ", dasm32_csr(opcode, 1)};
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endcase
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endfunction
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function string dasm32_csr(input[31:0] opcode, input im=0);
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bit[11:0] csr;
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csr = opcode[31:20];
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if(im) begin
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return $sformatf("%s,csr_%0h,0x%h", abi_reg[opcode[11:7]], csr, opcode[19:15]);
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end
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else begin
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return $sformatf("%s,csr_%0h,%s", abi_reg[opcode[11:7]], csr, abi_reg[opcode[19:15]]);
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end
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endfunction
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//atomics
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function string dasm32_a(input[31:0] opcode, input tid=0);
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case(opcode[31:27])
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'b00010: return $sformatf("lr.w %s,(%s) [%h]", abi_reg[opcode[11:7]], abi_reg[opcode[19:15]], gpr[tid][opcode[19:15]]);
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'b00011: return $sformatf("sc.w %s,%s,(%s) [%h]", abi_reg[opcode[11:7]], abi_reg[opcode[24:20]], abi_reg[opcode[19:15]], gpr[tid][opcode[19:15]]);
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'b00001: return {"amoswap.w", dasm32_amo(opcode, tid)};
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'b00000: return {"amoadd.w", dasm32_amo(opcode, tid)};
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'b00100: return {"amoxor.w", dasm32_amo(opcode, tid)};
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'b01100: return {"amoand.w", dasm32_amo(opcode, tid)};
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'b01000: return {"amoor.w", dasm32_amo(opcode, tid)};
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'b10000: return {"amomin.w", dasm32_amo(opcode, tid)};
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'b10100: return {"amomax.w", dasm32_amo(opcode, tid)};
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'b11000: return {"amominu.w", dasm32_amo(opcode, tid)};
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'b11100: return {"amomaxu.w", dasm32_amo(opcode, tid)};
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endcase
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return $sformatf(".long 0x%h", opcode);
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endfunction
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function string dasm32_amo( input[31:0] opcode, input tid=0);
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return $sformatf(" %s,%s,(%s) [%h]", abi_reg[opcode[11:7]], abi_reg[opcode[24:20]], abi_reg[opcode[19:15]], gpr[tid][opcode[19:15]]);
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endfunction
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