1package xiangshan.backend.fu 2 3import chisel3._ 4import chisel3.util._ 5import xiangshan._ 6import utils._ 7import xiangshan.backend._ 8import xiangshan.backend.fu.FunctionUnit._ 9import xiangshan.backend.decode.isa._ 10 11class Jump extends FunctionUnit(jmpCfg){ 12 val io = IO(new ExuIO) 13 14 val (iovalid, src1, offset, func, pc, uop) = (io.in.valid, io.in.bits.src1, io.in.bits.uop.ctrl.imm, io.in.bits.uop.ctrl.fuOpType, SignExt(io.in.bits.uop.cf.pc, AddrBits), io.in.bits.uop) 15 16 val redirectHit = uop.needFlush(io.redirect) 17 val valid = iovalid && !redirectHit 18 19 val isRVC = uop.cf.brUpdate.isRVC 20 val pcDelaySlot = Mux(isRVC, pc + 2.U, pc + 4.U) 21 val target = src1 + offset // NOTE: src1 is (pc/rf(rs1)), src2 is (offset) 22 23 io.out.bits.redirectValid := valid 24 io.out.bits.redirect.pc := uop.cf.pc 25 io.out.bits.redirect.target := target 26 io.out.bits.redirect.brTag := uop.brTag 27 io.out.bits.redirect.isException := false.B 28 io.out.bits.redirect.isMisPred := DontCare // check this in brq 29 io.out.bits.redirect.isReplay := false.B 30 io.out.bits.redirect.roqIdx := uop.roqIdx 31 32 io.out.bits.brUpdate := uop.cf.brUpdate 33 io.out.bits.brUpdate.brTarget := target // DontCare 34 io.out.bits.brUpdate.btbType := LookupTree(func, RV32I_BRUInstr.bruFuncTobtbTypeTable) 35 io.out.bits.brUpdate.taken := true.B 36 io.out.bits.brUpdate.fetchIdx := uop.cf.brUpdate.fetchOffset >> 1.U //TODO: consider RVC 37 38 // Output 39 val res = pcDelaySlot 40 41 io.in.ready := io.out.ready 42 io.out.valid := valid // TODO: CSR/MOU/FMV may need change it 43 io.out.bits.uop <> io.in.bits.uop 44 io.out.bits.data := res 45 46 io.dmem <> DontCare 47 io.out.bits.debug <> DontCare 48 49 // NOTE: the debug info is for one-cycle exec, if FMV needs multi-cycle, may needs change it 50 XSDebug(io.in.valid, "In(%d %d) Out(%d %d) Redirect:(%d %d %d) brTag:%x\n", 51 io.in.valid, 52 io.in.ready, 53 io.out.valid, 54 io.out.ready, 55 io.redirect.valid, 56 io.redirect.bits.isException, 57 redirectHit, 58 io.redirect.bits.brTag.value 59 ) 60 XSDebug(io.in.valid, "src1:%x offset:%x func:%b type:JUMP pc:%x res:%x\n", src1, offset, func, pc, res) 61} 62