riscv/rocket-chip
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Refactor breakpoints and support range comparison (currently disabled)

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This commit is contained in:
Andrew Waterman 2016-06-10 19:55:58 -07:00
parent c8c7246cce
commit e3b4b55836
3 changed files with 53 additions and 32 deletions
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41
rocket/src/main/scala/breakpoint.scala
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@ -30,13 +30,28 @@ class BPControl(implicit p: Parameters) extends CoreBundle()(p) {
def tdrType = 1
def bpaMaskMax = 4
def enabled(mstatus: MStatus) = Cat(m, h, s, u)(mstatus.prv)
}
class BP(implicit p: Parameters) extends CoreBundle()(p) {
val control = new BPControl
val address = UInt(width = vaddrBits)
def mask(dummy: Int = 0) = {
var mask: UInt = control.bpmatch(1)
for (i <- 1 until control.bpaMaskMax)
mask = Cat(mask(i-1) && address(i-1), mask)
mask
}
def pow2AddressMatch(x: UInt) =
(~x | mask()) === (~address | mask())
}
class BreakpointUnit(implicit p: Parameters) extends CoreModule()(p) {
val io = new Bundle {
val status = new MStatus().asInput
val bpcontrol = Vec(p(NBreakpoints), new BPControl).asInput
val bpaddress = Vec(p(NBreakpoints), UInt(width = vaddrBits)).asInput
val bp = Vec(p(NBreakpoints), new BP).asInput
val pc = UInt(INPUT, vaddrBits)
val ea = UInt(INPUT, vaddrBits)
val xcpt_if = Bool(OUTPUT)
@ -48,16 +63,20 @@ class BreakpointUnit(implicit p: Parameters) extends CoreModule()(p) {
io.xcpt_ld := false
io.xcpt_st := false
for (((bpc, bpa), i) <- io.bpcontrol zip io.bpaddress zipWithIndex) {
var mask: UInt = bpc.bpmatch(1)
for (i <- 1 until bpc.bpaMaskMax)
mask = Cat(mask(i-1) && bpa(i-1), mask)
for (bp <- io.bp) {
when (bp.control.enabled(io.status)) {
when (bp.pow2AddressMatch(io.pc) && bp.control.x) { io.xcpt_if := true }
when (bp.pow2AddressMatch(io.ea) && bp.control.r) { io.xcpt_ld := true }
when (bp.pow2AddressMatch(io.ea) && bp.control.w) { io.xcpt_st := true }
}
}
def matches(x: UInt) = (~x | mask) === (~bpa | mask)
when (Cat(bpc.m, bpc.h, bpc.s, bpc.u)(io.status.prv)) {
when (matches(io.pc) && bpc.x) { io.xcpt_if := true }
when (matches(io.ea) && bpc.r) { io.xcpt_ld := true }
when (matches(io.ea) && bpc.w) { io.xcpt_st := true }
if (!io.bp.isEmpty) for ((bpl, bph) <- io.bp zip io.bp.tail) {
def matches(x: UInt) = !(x < bpl.address) && x < bph.address
when (bph.control.enabled(io.status) && bph.control.bpmatch === 1) {
when (matches(io.pc) && bph.control.x) { io.xcpt_if := true }
when (matches(io.ea) && bph.control.r) { io.xcpt_ld := true }
when (matches(io.ea) && bph.control.w) { io.xcpt_st := true }
}
}
}

39
rocket/src/main/scala/csr.scala
View File

@ -126,8 +126,7 @@ class CSRFileIO(implicit p: Parameters) extends CoreBundle {
val rocc = new RoCCInterface().flip
val interrupt = Bool(OUTPUT)
val interrupt_cause = UInt(OUTPUT, xLen)
val bpcontrol = Vec(p(NBreakpoints), new BPControl).asOutput
val bpaddress = Vec(p(NBreakpoints), UInt(width = vaddrBits)).asOutput
val bp = Vec(p(NBreakpoints), new BP).asOutput
}
class CSRFile(implicit p: Parameters) extends CoreModule()(p)
@ -174,8 +173,7 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
val reg_dscratch = Reg(UInt(width = xLen))
val reg_tdrselect = Reg(new TDRSelect)
val reg_bpcontrol = Reg(Vec(p(NBreakpoints), new BPControl))
val reg_bpaddress = Reg(Vec(p(NBreakpoints), UInt(width = vaddrBits)))
val reg_bp = Reg(Vec(1 << log2Up(p(NBreakpoints)), new BP))
val reg_mie = Reg(init=UInt(0, xLen))
val reg_mideleg = Reg(init=UInt(0, xLen))
@ -214,8 +212,7 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
val interruptCause = interruptMSB + PriorityEncoder(all_interrupts)
io.interrupt := all_interrupts.orR
io.interrupt_cause := interruptCause
io.bpcontrol := reg_bpcontrol
io.bpaddress := reg_bpaddress
io.bp := reg_bp take p(NBreakpoints)
val debugIntCause = reg_mip.getWidth
// debug interrupts are only masked by being in debug mode
@ -238,8 +235,8 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
val read_mapping = collection.mutable.LinkedHashMap[Int,Bits](
CSRs.tdrselect -> reg_tdrselect.toBits,
CSRs.tdrdata1 -> (if (p(NBreakpoints) > 0) reg_bpcontrol(reg_tdrselect.tdrindex).toBits else UInt(0)),
CSRs.tdrdata2 -> (if (p(NBreakpoints) > 0) reg_bpaddress(reg_tdrselect.tdrindex) else UInt(0)),
CSRs.tdrdata1 -> reg_bp(reg_tdrselect.tdrindex).control.toBits,
CSRs.tdrdata2 -> reg_bp(reg_tdrselect.tdrindex).address,
CSRs.mimpid -> UInt(0),
CSRs.marchid -> UInt(0),
CSRs.mvendorid -> UInt(0),
@ -340,9 +337,10 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
val read_only = io.rw.addr(11,10).andR
val cpu_wen = cpu_ren && io.rw.cmd =/= CSR.R && priv_sufficient
val wen = cpu_wen && !read_only
val wdata = Mux(io.rw.cmd === CSR.S, io.rw.rdata | io.rw.wdata,
Mux(io.rw.cmd === CSR.C, io.rw.rdata & ~io.rw.wdata,
io.rw.wdata))
val wdata = (Mux((io.rw.cmd === CSR.S || io.rw.cmd === CSR.C), io.rw.rdata, UInt(0)) |
Mux(io.rw.cmd =/= CSR.C, io.rw.wdata, UInt(0))) &
~Mux(io.rw.cmd === CSR.C, io.rw.wdata, UInt(0))
val do_system_insn = priv_sufficient && system_insn
val opcode = UInt(1) << io.rw.addr(2,0)
@ -525,15 +523,17 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
when (decoded_addr(CSRs.medeleg)) { reg_medeleg := wdata & delegable_exceptions }
}
if (p(NBreakpoints) > 0) {
val canWrite = reg_tdrselect.tdrmode || reg_debug
val newTDR = new TDRSelect().fromBits(wdata)
when (decoded_addr(CSRs.tdrselect) && newTDR.tdrindex < newTDR.nTDR) { reg_tdrselect.tdrindex := newTDR.tdrindex }
when (decoded_addr(CSRs.tdrdata1) && canWrite) {
when (decoded_addr(CSRs.tdrselect)) { reg_tdrselect.tdrindex := newTDR.tdrindex }
when (reg_tdrselect.tdrmode || reg_debug) {
when (decoded_addr(CSRs.tdrdata1)) {
val newBPC = new BPControl().fromBits(wdata)
reg_bpcontrol(reg_tdrselect.tdrindex) := newBPC
reg_bpcontrol(reg_tdrselect.tdrindex).bpmatch := newBPC.bpmatch & 2 /* exact/NAPOT only */
reg_bp(reg_tdrselect.tdrindex).control := newBPC
reg_bp(reg_tdrselect.tdrindex).control.bpmatch := newBPC.bpmatch & 2 /* exact/NAPOT only */
}
when (decoded_addr(CSRs.tdrdata2)) { reg_bp(reg_tdrselect.tdrindex).address := wdata }
}
when (decoded_addr(CSRs.tdrdata2) && canWrite) { reg_bpaddress(reg_tdrselect.tdrindex) := wdata }
}
}
@ -553,7 +553,8 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
reg_tdrselect.reserved := 0
reg_tdrselect.tdrmode := true // TODO support D-mode breakpoint theft
for (bpc <- reg_bpcontrol) {
if (reg_bp.isEmpty) reg_tdrselect.tdrindex := 0
for (bpc <- reg_bp map {_.control}) {
bpc.tdrtype := bpc.tdrType
bpc.bpamaskmax := bpc.bpaMaskMax
bpc.reserved := 0
@ -568,4 +569,6 @@ class CSRFile(implicit p: Parameters) extends CoreModule()(p)
bpc.x := false
}
}
for (bp <- reg_bp drop p(NBreakpoints))
bp := new BP().fromBits(0)
}

3
rocket/src/main/scala/rocket.scala
View File

@ -228,8 +228,7 @@ class Rocket(implicit p: Parameters) extends CoreModule()(p) {
val bpu = Module(new BreakpointUnit)
bpu.io.status := csr.io.status
bpu.io.bpcontrol := csr.io.bpcontrol
bpu.io.bpaddress := csr.io.bpaddress
bpu.io.bp := csr.io.bp
bpu.io.pc := id_pc
bpu.io.ea := mem_reg_wdata