| Line 33... |
Line 33... |
sc_trace(o_vcd, o_pc, "/top/proc0/dec0/o_pc");
|
sc_trace(o_vcd, o_pc, "/top/proc0/dec0/o_pc");
|
sc_trace(o_vcd, o_instr, "/top/proc0/dec0/o_instr");
|
sc_trace(o_vcd, o_instr, "/top/proc0/dec0/o_instr");
|
sc_trace(o_vcd, o_isa_type, "/top/proc0/dec0/o_isa_type");
|
sc_trace(o_vcd, o_isa_type, "/top/proc0/dec0/o_isa_type");
|
sc_trace(o_vcd, o_instr_vec, "/top/proc0/dec0/o_instr_vec");
|
sc_trace(o_vcd, o_instr_vec, "/top/proc0/dec0/o_instr_vec");
|
sc_trace(o_vcd, o_exception, "/top/proc0/dec0/o_exception");
|
sc_trace(o_vcd, o_exception, "/top/proc0/dec0/o_exception");
|
|
sc_trace(o_vcd, o_compressed, "/top/proc0/dec0/o_compressed");
|
}
|
}
|
}
|
}
|
|
|
void InstrDecoder::comb() {
|
void InstrDecoder::comb() {
|
v = r;
|
v = r;
|
|
|
bool w_o_valid;
|
bool w_o_valid;
|
bool w_error = false;
|
bool w_error = false;
|
|
bool w_compressed = false;
|
sc_uint<32> wb_instr = i_f_instr.read();
|
sc_uint<32> wb_instr = i_f_instr.read();
|
sc_uint<5> wb_opcode1 = wb_instr(6, 2);
|
sc_uint<32> wb_instr_out;
|
sc_uint<3> wb_opcode2 = wb_instr(14, 12);
|
sc_uint<5> wb_opcode1;
|
|
sc_uint<3> wb_opcode2;
|
sc_bv<Instr_Total> wb_dec = 0;
|
sc_bv<Instr_Total> wb_dec = 0;
|
sc_bv<ISA_Total> wb_isa_type = 0;
|
sc_bv<ISA_Total> wb_isa_type = 0;
|
|
|
if (wb_instr(1, 0) != 0x3) {
|
if (wb_instr(1, 0) != 0x3) {
|
|
w_compressed = 1;
|
|
wb_opcode1 = (wb_instr(15, 13), wb_instr(1, 0));
|
|
wb_instr_out = 0x00000003;
|
|
switch (wb_opcode1) {
|
|
case OPCODE_C_ADDI4SPN:
|
|
wb_isa_type[ISA_I_type] = 1;
|
|
wb_dec[Instr_ADDI] = 1;
|
|
wb_instr_out(11, 7) = 0x8 | wb_instr(4, 2); // rd
|
|
wb_instr_out(19, 15) = 0x2; // rs1 = sp
|
|
wb_instr_out(29, 22) =
|
|
(wb_instr(10, 7), wb_instr(12, 11), wb_instr[5], wb_instr[6]);
|
|
break;
|
|
case OPCODE_C_NOP_ADDI:
|
|
wb_isa_type[ISA_I_type] = 1;
|
|
wb_dec[Instr_ADDI] = 1;
|
|
wb_instr_out(11, 7) = wb_instr(11, 7); // rd
|
|
wb_instr_out(19, 15) = wb_instr(11, 7); // rs1
|
|
wb_instr_out(24, 20) = wb_instr(6, 2); // imm
|
|
if (wb_instr[12]) {
|
|
wb_instr_out(31, 25) = ~0;
|
|
}
|
|
break;
|
|
case OPCODE_C_SLLI:
|
|
wb_isa_type[ISA_I_type] = 1;
|
|
wb_dec[Instr_SLLI] = 1;
|
|
wb_instr_out(11, 7) = wb_instr(11, 7); // rd
|
|
wb_instr_out(19, 15) = wb_instr(11, 7); // rs1
|
|
wb_instr_out(25, 20) = (wb_instr[12], wb_instr(6, 2)); // shamt
|
|
break;
|
|
case OPCODE_C_JAL_ADDIW:
|
|
// JAL is the RV32C only instruction
|
|
wb_isa_type[ISA_I_type] = 1;
|
|
wb_dec[Instr_ADDIW] = 1;
|
|
wb_instr_out(11, 7) = wb_instr(11, 7); // rd
|
|
wb_instr_out(19, 15) = wb_instr(11, 7); // rs1
|
|
wb_instr_out(24, 20) = wb_instr(6, 2); // imm
|
|
if (wb_instr[12]) {
|
|
wb_instr_out(31, 25) = ~0;
|
|
}
|
|
break;
|
|
case OPCODE_C_LW:
|
|
wb_isa_type[ISA_I_type] = 1;
|
|
wb_dec[Instr_LW] = 1;
|
|
wb_instr_out(11, 7) = 0x8 | wb_instr(4, 2); // rd
|
|
wb_instr_out(19, 15) = 0x8 | wb_instr(9, 7); // rs1
|
|
wb_instr_out(26, 22) =
|
|
(wb_instr[5], wb_instr(12, 10), wb_instr[6]);
|
|
break;
|
|
case OPCODE_C_LI: // ADDI rd = r0 + imm
|
|
wb_isa_type[ISA_I_type] = 1;
|
|
wb_dec[Instr_ADDI] = 1;
|
|
wb_instr_out(11, 7) = wb_instr(11, 7); // rd
|
|
wb_instr_out(24, 20) = wb_instr(6, 2); // imm
|
|
if (wb_instr[12]) {
|
|
wb_instr_out(31, 25) = ~0;
|
|
}
|
|
break;
|
|
case OPCODE_C_LWSP:
|
|
wb_isa_type[ISA_I_type] = 1;
|
|
wb_dec[Instr_LW] = 1;
|
|
wb_instr_out(11, 7) = wb_instr(11, 7); // rd
|
|
wb_instr_out(19, 15) = 0x2; // rs1 = sp
|
|
wb_instr_out(27, 22) =
|
|
(wb_instr(3, 2), wb_instr[12], wb_instr(6, 4));
|
|
break;
|
|
case OPCODE_C_LD:
|
|
wb_isa_type[ISA_I_type] = 1;
|
|
wb_dec[Instr_LD] = 1;
|
|
wb_instr_out(11, 7) = 0x8 | wb_instr(4, 2); // rd
|
|
wb_instr_out(19, 15) = 0x8 | wb_instr(9, 7); // rs1
|
|
wb_instr_out(27, 23) =
|
|
(wb_instr[6], wb_instr[5], wb_instr(12, 10));
|
|
break;
|
|
case OPCODE_C_ADDI16SP_LUI:
|
|
if (wb_instr(11, 7) == 0x2) {
|
|
wb_isa_type[ISA_I_type] = 1;
|
|
wb_dec[Instr_ADDI] = 1;
|
|
wb_instr_out(11, 7) = 0x2; // rd = sp
|
|
wb_instr_out(19, 15) = 0x2; // rs1 = sp
|
|
wb_instr_out(28, 24) =
|
|
(wb_instr(4, 3), wb_instr[5], wb_instr[2], wb_instr[6]);
|
|
if (wb_instr[12]) {
|
|
wb_instr_out(31, 29) = ~0;
|
|
}
|
|
} else {
|
|
wb_isa_type[ISA_U_type] = 1;
|
|
wb_dec[Instr_LUI] = 1;
|
|
wb_instr_out(11, 7) = wb_instr(11, 7); // rd
|
|
wb_instr_out(16, 12) = wb_instr(6, 2);
|
|
if (wb_instr[12]) {
|
|
wb_instr_out(31, 17) = ~0;
|
|
}
|
|
}
|
|
break;
|
|
case OPCODE_C_LDSP:
|
|
wb_isa_type[ISA_I_type] = 1;
|
|
wb_dec[Instr_LD] = 1;
|
|
wb_instr_out(11, 7) = wb_instr(11, 7); // rd
|
|
wb_instr_out(19, 15) = 0x2; // rs1 = sp
|
|
wb_instr_out(28, 23) =
|
|
(wb_instr(4, 2), wb_instr[12], wb_instr(6, 5));
|
|
break;
|
|
case OPCODE_C_MATH:
|
|
if (wb_instr(11, 10) == 0) {
|
|
wb_isa_type[ISA_I_type] = 1;
|
|
wb_dec[Instr_SRLI] = 1;
|
|
wb_instr_out(11, 7) = 0x8 | wb_instr(9, 7); // rd
|
|
wb_instr_out(19, 15) = 0x8 | wb_instr(9, 7); // rs1
|
|
wb_instr_out(25, 20) = (wb_instr[12], wb_instr(6, 2)); // shamt
|
|
} else if (wb_instr(11, 10) == 1) {
|
|
wb_isa_type[ISA_I_type] = 1;
|
|
wb_dec[Instr_SRAI] = 1;
|
|
wb_instr_out(11, 7) = 0x8 | wb_instr(9, 7); // rd
|
|
wb_instr_out(19, 15) = 0x8 | wb_instr(9, 7); // rs1
|
|
wb_instr_out(25, 20) = (wb_instr[12], wb_instr(6, 2)); // shamt
|
|
} else if (wb_instr(11, 10) == 2) {
|
|
wb_isa_type[ISA_I_type] = 1;
|
|
wb_dec[Instr_ANDI] = 1;
|
|
wb_instr_out(11, 7) = 0x8 | wb_instr(9, 7); // rd
|
|
wb_instr_out(19, 15) = 0x8 | wb_instr(9, 7); // rs1
|
|
wb_instr_out(24, 20) = wb_instr(6, 2); // imm
|
|
if (wb_instr[12]) {
|
|
wb_instr_out(31, 25) = ~0;
|
|
}
|
|
} else if (wb_instr[12] == 0) {
|
|
wb_isa_type[ISA_R_type] = 1;
|
|
wb_instr_out(11, 7) = 0x8 | wb_instr(9, 7); // rd
|
|
wb_instr_out(19, 15) = 0x8 | wb_instr(9, 7); // rs1
|
|
wb_instr_out(24, 20) = 0x8 | wb_instr(4, 2); // rs2
|
|
switch (wb_instr(6, 5)) {
|
|
case 0:
|
|
wb_dec[Instr_SUB] = 1;
|
|
break;
|
|
case 1:
|
|
wb_dec[Instr_XOR] = 1;
|
|
break;
|
|
case 2:
|
|
wb_dec[Instr_OR] = 1;
|
|
break;
|
|
default:
|
|
wb_dec[Instr_AND] = 1;
|
|
}
|
|
} else {
|
|
wb_isa_type[ISA_R_type] = 1;
|
|
wb_instr_out(11, 7) = 0x8 | wb_instr(9, 7); // rd
|
|
wb_instr_out(19, 15) = 0x8 | wb_instr(9, 7); // rs1
|
|
wb_instr_out(24, 20) = 0x8 | wb_instr(4, 2); // rs2
|
|
switch (wb_instr(6, 5)) {
|
|
case 0:
|
|
wb_dec[Instr_SUBW] = 1;
|
|
break;
|
|
case 1:
|
|
wb_dec[Instr_ADDW] = 1;
|
|
break;
|
|
default:
|
w_error = true;
|
w_error = true;
|
}
|
}
|
|
}
|
|
break;
|
|
case OPCODE_C_JR_MV_EBREAK_JALR_ADD:
|
|
wb_isa_type[ISA_I_type] = 1;
|
|
if (wb_instr[12] == 0) {
|
|
if (wb_instr(6, 2) == 0) {
|
|
wb_dec[Instr_JALR] = 1;
|
|
wb_instr_out(19, 15) = wb_instr(11, 7); // rs1
|
|
} else {
|
|
wb_dec[Instr_ADDI] = 1;
|
|
wb_instr_out(11, 7) = wb_instr(11, 7); // rd
|
|
wb_instr_out(19, 15) = wb_instr(6, 2); // rs1
|
|
}
|
|
} else {
|
|
if (wb_instr(11, 7) == 0 && wb_instr(6, 2) == 0) {
|
|
wb_dec[Instr_EBREAK] = 1;
|
|
} else if (wb_instr(6, 2) == 0) {
|
|
wb_dec[Instr_JALR] = 1;
|
|
wb_instr_out(11, 7) = 0x1; // rd = ra
|
|
wb_instr_out(19, 15) = wb_instr(11, 7); // rs1
|
|
} else {
|
|
wb_dec[Instr_ADD] = 1;
|
|
wb_isa_type[ISA_R_type] = 1;
|
|
wb_instr_out(11, 7) = wb_instr(11, 7); // rd
|
|
wb_instr_out(19, 15) = wb_instr(11, 7); // rs1
|
|
wb_instr_out(24, 20) = wb_instr(6, 2); // rs2
|
|
}
|
|
}
|
|
break;
|
|
case OPCODE_C_J: // JAL with rd = 0
|
|
wb_isa_type[ISA_UJ_type] = 1;
|
|
wb_dec[Instr_JAL] = 1;
|
|
wb_instr_out[20] = wb_instr[12]; // imm11
|
|
wb_instr_out(23, 21) = wb_instr(5, 3); // imm10_1(3:1)
|
|
wb_instr_out[24] = wb_instr[11]; // imm10_1(4)
|
|
wb_instr_out[25] = wb_instr[2]; // imm10_1(5)
|
|
wb_instr_out[26] = wb_instr[7]; // imm10_1(6)
|
|
wb_instr_out[27] = wb_instr[6]; // imm10_1(7)
|
|
wb_instr_out(29, 28) = wb_instr(10, 9); // imm10_1(9:8)
|
|
wb_instr_out[30] = wb_instr[8]; // imm10_1(10)
|
|
if (wb_instr[12]) {
|
|
wb_instr_out(19, 12) = ~0; // imm19_12
|
|
wb_instr_out[31] = 1; // imm20
|
|
}
|
|
break;
|
|
case OPCODE_C_SW:
|
|
wb_isa_type[ISA_S_type] = 1;
|
|
wb_dec[Instr_SW] = 1;
|
|
wb_instr_out(24, 20) = 0x8 | wb_instr(4, 2); // rs2
|
|
wb_instr_out(19, 15) = 0x8 | wb_instr(9, 7); // rs1
|
|
wb_instr_out(11, 9) = (wb_instr(11, 10), wb_instr[6]);
|
|
wb_instr_out(26, 25) = (wb_instr[5] , wb_instr[12]);
|
|
break;
|
|
case OPCODE_C_BEQZ:
|
|
wb_isa_type[ISA_SB_type] = 1;
|
|
wb_dec[Instr_BEQ] = 1;
|
|
wb_instr_out(19, 15) = 0x8 | wb_instr(9, 7); // rs1
|
|
wb_instr_out(11, 8) = (wb_instr(11, 10), wb_instr(4, 3));
|
|
wb_instr_out(27, 25) = (wb_instr(6, 5), wb_instr[2]);
|
|
if (wb_instr[12]) {
|
|
wb_instr_out(30, 28) = ~0;
|
|
wb_instr_out[7] = 1;
|
|
wb_instr_out[31] = 1;
|
|
}
|
|
break;
|
|
case OPCODE_C_SWSP:
|
|
wb_isa_type[ISA_S_type] = 1;
|
|
wb_dec[Instr_SW] = 1;
|
|
wb_instr_out(24, 20) = wb_instr(6, 2); // rs2
|
|
wb_instr_out(19, 15) = 0x2; // rs1 = sp
|
|
wb_instr_out(11, 9) = wb_instr(11, 9);
|
|
wb_instr_out(27, 25) = (wb_instr(8, 7), wb_instr[12]);
|
|
break;
|
|
case OPCODE_C_SD:
|
|
wb_isa_type[ISA_S_type] = 1;
|
|
wb_dec[Instr_SD] = 1;
|
|
wb_instr_out(24, 20) = 0x8 | wb_instr(4, 2); // rs2
|
|
wb_instr_out(19, 15) = 0x8 | wb_instr(9, 7); // rs1
|
|
wb_instr_out(11, 10) = wb_instr(11, 10);
|
|
wb_instr_out(27, 25) = (wb_instr(6, 5), wb_instr[12]);
|
|
break;
|
|
case OPCODE_C_BNEZ:
|
|
wb_isa_type[ISA_SB_type] = 1;
|
|
wb_dec[Instr_BNE] = 1;
|
|
wb_instr_out(19, 15) = 0x8 | wb_instr(9, 7); // rs1
|
|
wb_instr_out(11, 8) = (wb_instr(11, 10), wb_instr(4, 3));
|
|
wb_instr_out(27, 25) = (wb_instr(6, 5), wb_instr[2]);
|
|
if (wb_instr[12]) {
|
|
wb_instr_out(30, 28) = ~0;
|
|
wb_instr_out[7] = 1;
|
|
wb_instr_out[31] = 1;
|
|
}
|
|
break;
|
|
case OPCODE_C_SDSP:
|
|
wb_isa_type[ISA_S_type] = 1;
|
|
wb_dec[Instr_SD] = 1;
|
|
wb_instr_out(24, 20) = wb_instr(6, 2); // rs2
|
|
wb_instr_out(19, 15) = 0x2; // rs1 = sp
|
|
wb_instr_out(11, 10) = wb_instr(11, 10);
|
|
wb_instr_out(28, 25) = (wb_instr(9, 7), wb_instr[12]);
|
|
break;
|
|
default:
|
|
w_error = true;
|
|
}
|
|
} else {
|
|
wb_opcode1 = wb_instr(6, 2);
|
|
wb_opcode2 = wb_instr(14, 12);
|
switch (wb_opcode1) {
|
switch (wb_opcode1) {
|
case OPCODE_ADD:
|
case OPCODE_ADD:
|
wb_isa_type[ISA_R_type] = 1;
|
wb_isa_type[ISA_R_type] = 1;
|
switch (wb_opcode2) {
|
switch (wb_opcode2) {
|
case 0:
|
case 0:
|
| Line 381... |
Line 645... |
break;
|
break;
|
|
|
default:
|
default:
|
w_error = true;
|
w_error = true;
|
}
|
}
|
|
wb_instr_out = wb_instr;
|
|
} // compressed/!compressed
|
|
|
if (i_f_valid.read()) {
|
if (i_f_valid.read()) {
|
v.valid = 1;
|
v.valid = 1;
|
v.pc = i_f_pc;
|
v.pc = i_f_pc;
|
v.instr = wb_instr;
|
v.instr = wb_instr_out;
|
|
v.compressed = w_compressed;
|
|
|
v.isa_type = wb_isa_type;
|
v.isa_type = wb_isa_type;
|
v.instr_vec = wb_dec;
|
v.instr_vec = wb_dec;
|
v.memop_store = (wb_dec[Instr_SD] | wb_dec[Instr_SW]
|
v.memop_store = (wb_dec[Instr_SD] | wb_dec[Instr_SW]
|
| wb_dec[Instr_SH] | wb_dec[Instr_SB]).to_bool();
|
| wb_dec[Instr_SH] | wb_dec[Instr_SB]).to_bool();
|
| Line 435... |
Line 701... |
v.memop_load = 0;
|
v.memop_load = 0;
|
v.memop_sign_ext = 0;
|
v.memop_sign_ext = 0;
|
v.memop_size = MEMOP_1B;
|
v.memop_size = MEMOP_1B;
|
v.unsigned_op = 0;
|
v.unsigned_op = 0;
|
v.rv32 = 0;
|
v.rv32 = 0;
|
|
v.compressed = 0;
|
|
|
v.instr_unimplemented = !wb_dec.or_reduce();
|
v.instr_unimplemented = !wb_dec.or_reduce();
|
}
|
}
|
|
|
o_valid = w_o_valid;
|
o_valid = w_o_valid;
|
| Line 448... |
Line 715... |
o_memop_store = r.memop_store;
|
o_memop_store = r.memop_store;
|
o_memop_sign_ext = r.memop_sign_ext;
|
o_memop_sign_ext = r.memop_sign_ext;
|
o_memop_size = r.memop_size;
|
o_memop_size = r.memop_size;
|
o_unsigned_op = r.unsigned_op;
|
o_unsigned_op = r.unsigned_op;
|
o_rv32 = r.rv32;
|
o_rv32 = r.rv32;
|
|
o_compressed = r.compressed;
|
o_isa_type = r.isa_type;
|
o_isa_type = r.isa_type;
|
o_instr_vec = r.instr_vec;
|
o_instr_vec = r.instr_vec;
|
o_exception = r.instr_unimplemented;
|
o_exception = r.instr_unimplemented;
|
}
|
}
|
|
|
