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csr: Bring functionality in line with v13 spec. ebreak does not cause exception in Debug Mode, it just starts at Debug ROM again.

This commit is contained in:
Megan Wachs 2017-03-27 21:21:48 -07:00
parent 42ca597478
commit bb64c92906
1 changed files with 11 additions and 11 deletions
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22
src/main/scala/rocket/CSR.scala
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@ -47,8 +47,7 @@ class MStatus extends Bundle {
class DCSR extends Bundle {
val xdebugver = UInt(width = 2)
val ndreset = Bool()
val fullreset = Bool()
val zero4 = UInt(width=2)
val zero3 = UInt(width = 12)
val ebreakm = Bool()
val ebreakh = Bool()
@ -58,9 +57,9 @@ 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 = Bool()
val halt = Bool()
val zero1 = UInt(width=2)
val step = Bool()
val prv = UInt(width = PRV.SZ)
}
@ -468,8 +467,8 @@ class CSRFile(perfEventSets: EventSets = new EventSets(Seq()))(implicit p: Param
val causeIsDebugTrigger = !cause(xLen-1) && cause_lsbs === CSR.debugTriggerCause
val causeIsDebugBreak = !cause(xLen-1) && insn_break && Cat(reg_dcsr.ebreakm, reg_dcsr.ebreakh, reg_dcsr.ebreaks, reg_dcsr.ebreaku)(reg_mstatus.prv)
val trapToDebug = Bool(usingDebug) && (reg_singleStepped || causeIsDebugInt || causeIsDebugTrigger || causeIsDebugBreak || reg_debug)
val debugTVec = Mux(reg_debug, Mux(insn_break, UInt(0x800), UInt(0x808)), UInt(0x800))
val delegate = Bool(usingVM) && reg_mstatus.prv <= PRV.S && Mux(cause(xLen-1), reg_mideleg(cause_lsbs), reg_medeleg(cause_lsbs))
val debugTVec = Mux(reg_debug, UInt(0x808), UInt(0x800))
val tvec = Mux(trapToDebug, debugTVec, Mux(delegate, reg_stvec.sextTo(vaddrBitsExtended), reg_mtvec))
io.evec := tvec
io.ptbr := reg_sptbr
@ -505,11 +504,13 @@ class CSRFile(perfEventSets: EventSets = new EventSets(Seq()))(implicit p: Param
)
when (trapToDebug) {
reg_debug := true
reg_dpc := epc
reg_dcsr.cause := Mux(reg_singleStepped, 4, Mux(causeIsDebugInt, 3, Mux[UInt](causeIsDebugTrigger, 2, 1)))
reg_dcsr.prv := trimPrivilege(reg_mstatus.prv)
new_prv := PRV.M
when (!reg_debug) {
reg_debug := true
reg_dpc := epc
reg_dcsr.cause := Mux(reg_singleStepped, 4, Mux(causeIsDebugInt, 3, Mux[UInt](causeIsDebugTrigger, 2, 1)))
reg_dcsr.prv := trimPrivilege(reg_mstatus.prv)
new_prv := PRV.M
}
}.elsewhen (delegate) {
reg_sepc := formEPC(epc)
reg_scause := cause
@ -623,7 +624,6 @@ class CSRFile(perfEventSets: EventSets = new EventSets(Seq()))(implicit p: Param
if (usingDebug) {
when (decoded_addr(CSRs.dcsr)) {
val new_dcsr = new DCSR().fromBits(wdata)
reg_dcsr.halt := new_dcsr.halt
reg_dcsr.step := new_dcsr.step
reg_dcsr.ebreakm := new_dcsr.ebreakm
if (usingVM) reg_dcsr.ebreaks := new_dcsr.ebreaks