def MOpDecoder():
return GenDecoderFixed(
OpClass.OP_CLASS_MUL,
'm_msg',
MMsg(),
{'opcode': Opcode.OP},
['funct7', 'funct3'],
{
(0b0000001, 0b000):
m_msg(MFunc.M_FUNC_MUL, MVariant.M_VARIANT_N, 0),
(0b0000001, 0b001):
m_msg(MFunc.M_FUNC_MUL, MVariant.M_VARIANT_H, 0),
(0b0000001, 0b010):
m_msg(MFunc.M_FUNC_MUL, MVariant.M_VARIANT_HSU, 0),
(0b0000001, 0b011):
m_msg(MFunc.M_FUNC_MUL, MVariant.M_VARIANT_HU, 0),
(0b0000001, 0b100):
m_msg(MFunc.M_FUNC_DIV, MVariant.M_VARIANT_N, 0),
(0b0000001, 0b101):
m_msg(MFunc.M_FUNC_DIV, MVariant.M_VARIANT_U, 0),
(0b0000001, 0b110):
m_msg(MFunc.M_FUNC_REM, MVariant.M_VARIANT_N, 0),
(0b0000001, 0b111):
m_msg(MFunc.M_FUNC_REM, MVariant.M_VARIANT_U, 0),
},
rs1_val=1,
rs2_val=1,
rd_val=1,
)
def JALDecoder():
return GenDecoderFixed(
OpClass.OP_CLASS_JUMP,
'jump_msg',
JumpMsg(),
{'opcode': Opcode.JAL},
[],
0,
speculative=1,
rd_val=1,
imm_type=ImmType.IMM_TYPE_J,
imm_val=1,
)
def MiscDecoder():
return GenDecoderFixed(
OpClass.OP_CLASS_ALU,
'alu_msg',
AluMsg(),
{},
['opcode'],
{
Opcode.LUI: alu_msg(AluFunc.ALU_FUNC_LUI, 0, 0),
Opcode.AUIPC: alu_msg(AluFunc.ALU_FUNC_AUIPC, 0, 0),
},
rd_val=1,
imm_type=ImmType.IMM_TYPE_U,
imm_val=1,
)
def OpImm32Decoder():
return GenDecoderFixed(
OpClass.OP_CLASS_ALU,
'alu_msg',
AluMsg(),
{'opcode': Opcode.OP_IMM_32},
['funct3'],
{
0b000: alu_msg(AluFunc.ALU_FUNC_ADD, 0, 1),
},
rs1_val=1,
rd_val=1,
imm_type=ImmType.IMM_TYPE_I,
imm_val=1,
)
def FenceDecoder():
return GenDecoderFixed(
OpClass.OP_CLASS_SYSTEM,
'system_msg',
SystemMsg(),
{
'opcode': Opcode.MISC_MEM,
'rd': 0,
'funct3': 0,
'rs1': 0,
'fence_upper': 0,
},
[],
system_msg(SystemFunc.SYSTEM_FUNC_FENCE),
)
def OpImmShiftDecoder():
return GenDecoderFixed(
OpClass.OP_CLASS_ALU,
'alu_msg',
AluMsg(),
{'opcode': Opcode.OP_IMM},
['funct7_shft64', 'funct3'],
{
(0b000000, 0b001): alu_msg(AluFunc.ALU_FUNC_SLL, 0),
(0b000000, 0b101): alu_msg(AluFunc.ALU_FUNC_SRL, 0),
(0b010000, 0b101): alu_msg(AluFunc.ALU_FUNC_SRA, 0),
},
rs1_val=1,
rd_val=1,
imm_type=ImmType.IMM_TYPE_SHAMT64,
imm_val=1,
)
def Op32Decoder():
return GenDecoderFixed(
OpClass.OP_CLASS_ALU,
'alu_msg',
AluMsg(),
{'opcode': Opcode.OP_32},
['funct7', 'funct3'],
{
(0b0000000, 0b000): alu_msg(AluFunc.ALU_FUNC_ADD, 0, 1),
(0b0100000, 0b000): alu_msg(AluFunc.ALU_FUNC_SUB, 0, 1),
(0b0000000, 0b001): alu_msg(AluFunc.ALU_FUNC_SLL, 0, 1),
(0b0000000, 0b101): alu_msg(AluFunc.ALU_FUNC_SRL, 0, 1),
(0b0100000, 0b101): alu_msg(AluFunc.ALU_FUNC_SRA, 0, 1),
},
rs1_val=1,
rs2_val=1,
rd_val=1,
)
def SystemCallDecoder():
return GenDecoderFixed(
OpClass.OP_CLASS_SYSTEM,
'system_msg',
SystemMsg(),
{
'opcode': Opcode.SYSTEM,
'rd': 0,
'funct3': 0,
'rs1': 0,
'funct7': 0,
},
['rs2'],
{
0: system_msg(SystemFunc.SYSTEM_FUNC_ECALL),
1: system_msg(SystemFunc.SYSTEM_FUNC_EBREAK),
},
)
def OpImmDecoder():
return GenDecoderFixed(
OpClass.OP_CLASS_ALU,
'alu_msg',
AluMsg(),
{'opcode': Opcode.OP_IMM},
['funct3'],
{
0b000: alu_msg(AluFunc.ALU_FUNC_ADD, 0),
0b010: alu_msg(AluFunc.ALU_FUNC_SLT, 0),
0b011: alu_msg(AluFunc.ALU_FUNC_SLT, 1),
0b100: alu_msg(AluFunc.ALU_FUNC_XOR, 0),
0b110: alu_msg(AluFunc.ALU_FUNC_OR, 0),
0b111: alu_msg(AluFunc.ALU_FUNC_AND, 0),
},
rs1_val=1,
rd_val=1,
imm_type=ImmType.IMM_TYPE_I,
imm_val=1,
)