riscv/rocket-chip
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Merge pull request #825 from freechipsproject/debug_wfi

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Debug + WFI Interactions
This commit is contained in:
Megan Wachs 2017-06-28 21:28:51 -07:00 committed by GitHub
commit 992b480c74
3 changed files with 17 additions and 10 deletions
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2
riscv-tools

@ -1 +1 @@
Subproject commit 7cd1d1057d3bcd040b9e655fd35f57ccc97e075a
Subproject commit 75371b4e19435833f80767da691b718c68551f13

13
src/main/scala/rocket/CSR.scala
View File

@ -59,9 +59,7 @@ class DCSR extends Bundle {
val stopcycle = Bool()
val stoptime = Bool()
val cause = UInt(width = 3)
// TODO: debugint is not in the Debug Spec v13
val debugint = Bool()
val zero1 = UInt(width=2)
val zero1 = UInt(width=3)
val step = Bool()
val prv = UInt(width = PRV.SZ)
}
@ -214,6 +212,7 @@ class CSRFile(perfEventSets: EventSets = new EventSets(Seq()))(implicit p: Param
reset_dcsr.xdebugver := 1
reset_dcsr.prv := PRV.M
val reg_dcsr = Reg(init=reset_dcsr)
val reg_debugint = Reg(Bool())
val (supported_interrupts, delegable_interrupts) = {
val sup = Wire(new MIP)
@ -312,7 +311,7 @@ class CSRFile(perfEventSets: EventSets = new EventSets(Seq()))(implicit p: Param
io.pmp := reg_pmp.map(PMP(_))
// debug interrupts are only masked by being in debug mode
when (Bool(usingDebug) && reg_dcsr.debugint && !reg_debug) {
when (Bool(usingDebug) && reg_debugint && !reg_debug) {
io.interrupt := true
io.interrupt_cause := UInt(interruptMSB) + CSR.debugIntCause
}
@ -505,8 +504,8 @@ class CSRFile(perfEventSets: EventSets = new EventSets(Seq()))(implicit p: Param
val exception = insn_call || insn_break || io.exception
assert(PopCount(insn_ret :: insn_call :: insn_break :: io.exception :: Nil) <= 1, "these conditions must be mutually exclusive")
when (insn_wfi) { reg_wfi := true }
when (pending_interrupts.orR || exception) { reg_wfi := false }
when (insn_wfi && !io.singleStep && !reg_debug) { reg_wfi := true }
when (pending_interrupts.orR || exception || reg_debugint) { reg_wfi := false }
assert(!reg_wfi || io.retire === UInt(0))
when (io.retire(0) || exception) { reg_singleStepped := true }
@ -721,7 +720,7 @@ class CSRFile(perfEventSets: EventSets = new EventSets(Seq()))(implicit p: Param
reg_mip.mtip := io.interrupts.mtip
reg_mip.msip := io.interrupts.msip
reg_mip.meip := io.interrupts.meip
reg_dcsr.debugint := io.interrupts.debug
reg_debugint := io.interrupts.debug
if (!usingVM) {
reg_mideleg := 0

12
src/main/scala/uncore/devices/debug/Debug.scala
View File

@ -328,6 +328,8 @@ class TLDebugModuleOuter(device: Device)(implicit p: Parameters) extends LazyMod
when (DMCONTROLWrEn) {
DMCONTROLNxt.ndmreset := DMCONTROLWrData.ndmreset
DMCONTROLNxt.hartsel := DMCONTROLWrData.hartsel
DMCONTROLNxt.haltreq := DMCONTROLWrData.haltreq
DMCONTROLNxt.resumereq := DMCONTROLWrData.resumereq
}
}
@ -934,6 +936,8 @@ class TLDebugModuleInner(device: Device, getNComponents: () => Int)(implicit p:
val commandWrIsAccessRegister = (COMMANDWrData.cmdtype === DebugAbstractCommandType.AccessRegister.id.U)
val commandRegIsAccessRegister = (COMMANDReg.cmdtype === DebugAbstractCommandType.AccessRegister.id.U)
val commandWrIsUnsupported = COMMANDWrEn && !commandWrIsAccessRegister;
val commandRegIsUnsupported = Wire(init = true.B)
val commandRegBadHaltResume = Wire(init = false.B)
when (commandRegIsAccessRegister) {
@ -951,16 +955,20 @@ class TLDebugModuleInner(device: Device, getNComponents: () => Int)(implicit p:
// -----------------------
when (ctrlStateReg === CtrlState(Waiting)){
when (wrAccessRegisterCommand || regAccessRegisterCommand) {
ctrlStateNxt := CtrlState(CheckGenerate)
}.elsewhen (commandWrIsUnsupported) { // These checks are really on the command type.
errorUnsupported := true.B
}.elsewhen (autoexec && commandRegIsUnsupported) {
errorUnsupported := true.B
}
}.elsewhen (ctrlStateReg === CtrlState(CheckGenerate)){
// We use this state to ensure that the COMMAND has been
// registered by the time that we need to use it, to avoid
// generating it directly from the COMMANDWrData.
// This 'commandRegIsUnsupported' is really just checking the
// AccessRegisterCommand parameters (regno)
when (commandRegIsUnsupported) {
errorUnsupported := true.B
ctrlStateNxt := CtrlState(Waiting)