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.brTag.needFlush(io.redirect) 17 val valid = iovalid && !redirectHit 18 19 val isRVC = uop.cf.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.brTarget := target // DontCare 27 io.out.bits.redirect.brTag := uop.brTag 28 io.out.bits.redirect.btbType := LookupTree(func, RV32I_BRUInstr.bruFuncTobtbTypeTable) 29 io.out.bits.redirect.isRVC := isRVC 30 io.out.bits.redirect.taken := true.B 31 io.out.bits.redirect.hist := uop.cf.hist 32 io.out.bits.redirect.tageMeta := uop.cf.tageMeta 33 io.out.bits.redirect.fetchIdx := uop.cf.fetchOffset >> 1.U //TODO: consider RVC 34 io.out.bits.redirect.btbPredCtr := uop.cf.btbPredCtr 35 io.out.bits.redirect.btbHit := uop.cf.btbHit 36 io.out.bits.redirect.rasSp := uop.cf.rasSp 37 io.out.bits.redirect.rasTopCtr := uop.cf.rasTopCtr 38 io.out.bits.redirect.isException := false.B 39 io.out.bits.redirect.roqIdx := uop.roqIdx 40 41 // Output 42 val res = pcDelaySlot 43 44 io.in.ready := io.out.ready 45 io.out.valid := valid // TODO: CSR/MOU/FMV may need change it 46 io.out.bits.uop <> io.in.bits.uop 47 io.out.bits.data := res 48 49 io.dmem <> DontCare 50 io.out.bits.debug <> DontCare 51 52 // NOTE: the debug info is for one-cycle exec, if FMV needs multi-cycle, may needs change it 53 XSDebug(io.in.valid, "In(%d %d) Out(%d %d) Redirect:(%d %d %d) brTag:%x\n", 54 io.in.valid, 55 io.in.ready, 56 io.out.valid, 57 io.out.ready, 58 io.redirect.valid, 59 io.redirect.bits.isException, 60 redirectHit, 61 io.redirect.bits.brTag.value 62 ) 63 XSDebug(io.in.valid, "src1:%x offset:%x func:%b type:JUMP pc:%x res:%x\n", src1, offset, func, pc, res) 64} 65