From e1bbf567c22c9083febf0c44d5816881a33796c2 Mon Sep 17 00:00:00 2001 From: Donald Sebastian Leung Date: Tue, 4 Aug 2020 16:57:43 +0800 Subject: [PATCH] Add MUL instruction --- insns/insn_mul.py | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 insns/insn_mul.py diff --git a/insns/insn_mul.py b/insns/insn_mul.py new file mode 100644 index 0000000..5f250b1 --- /dev/null +++ b/insns/insn_mul.py @@ -0,0 +1,23 @@ +from insn_R import * + +class rvfi_insn_mul(rvfi_insn_R): + def __init__(self): + super(rvfi_insn_mul, self).__init__() + def ports(self): + return super(rvfi_insn_mul, self).ports() + def elaborate(self, platform): + m = super(rvfi_insn_mul, self).elaborate(platform) + + # MUL instruction + altops_bitmask = Signal(32) + m.d.comb += altops_bitmask.eq(0x2cdf52a55876063e) + result = Signal(32) + m.d.comb += result.eq((self.rvfi_rs1_rdata + self.rvfi_rs2_rdata) ^ altops_bitmask) + m.d.comb += self.spec_valid.eq(self.rvfi_valid & (~self.insn_padding) & (self.insn_funct7 == 0b0000001) & (self.insn_funct3 == 0b000) & (self.insn_opcode == 0b0110011)) + m.d.comb += self.spec_rs1_addr.eq(self.insn_rs1) + m.d.comb += self.spec_rs2_addr.eq(self.insn_rs2) + m.d.comb += self.spec_rd_addr.eq(self.insn_rd) + m.d.comb += self.spec_rd_wdata.eq(Mux(self.spec_rd_addr, result, 0)) + m.d.comb += self.spec_pc_wdata.eq(self.rvfi_pc_rdata + 4) + + return m