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rocket-chip
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Add cover properties for exceptions in the core.

This commit is contained in:
Richard Xia 2017-11-28 19:49:01 -08:00
parent 9d489c6dcd
commit 29c70501f2
1 changed files with 36 additions and 0 deletions
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36
src/main/scala/rocket/RocketCore.scala
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@ -9,6 +9,7 @@ import chisel3.core.withReset
import freechips.rocketchip.config.Parameters
import freechips.rocketchip.tile._
import freechips.rocketchip.util._
import freechips.rocketchip.util.property._
import scala.collection.immutable.ListMap
import scala.collection.mutable.ArrayBuffer
@ -239,6 +240,15 @@ class Rocket(implicit p: Parameters) extends CoreModule()(p)
(id_xcpt1.ae.inst, UInt(Causes.fetch_access)),
(id_illegal_insn, UInt(Causes.illegal_instruction))))
val idCoverCauses = List(
(CSR.debugTriggerCause, "DEBUG_TRIGGER"),
(Causes.breakpoint, "BREAKPOINT"),
(Causes.fetch_page_fault, "FETCH_PAGE_FAULT"),
(Causes.fetch_access, "FETCH_ACCESS"),
(Causes.illegal_instruction, "ILLEGAL_INSTRUCTION")
)
coverExceptions(id_xcpt, id_cause, "DECODE", idCoverCauses)
val dcache_bypass_data =
if (fastLoadByte) io.dmem.resp.bits.data
else if (fastLoadWord) io.dmem.resp.bits.data_word_bypass
@ -357,6 +367,9 @@ class Rocket(implicit p: Parameters) extends CoreModule()(p)
val (ex_xcpt, ex_cause) = checkExceptions(List(
(ex_reg_xcpt_interrupt || ex_reg_xcpt, ex_reg_cause)))
val exCoverCauses = idCoverCauses
coverExceptions(ex_xcpt, ex_cause, "EXECUTE", exCoverCauses)
// memory stage
val mem_pc_valid = mem_reg_valid || mem_reg_replay || mem_reg_xcpt_interrupt
val mem_br_target = mem_reg_pc.asSInt +
@ -423,6 +436,13 @@ class Rocket(implicit p: Parameters) extends CoreModule()(p)
(mem_reg_xcpt_interrupt || mem_reg_xcpt, mem_reg_cause),
(mem_reg_valid && mem_new_xcpt, mem_new_cause)))
val memCoverCauses = (exCoverCauses ++ List(
(CSR.debugTriggerCause, "DEBUG_TRIGGER"),
(Causes.breakpoint, "BREKPOINT"),
(Causes.misaligned_fetch, "MISALIGNED_FETCH")
)).distinct
coverExceptions(mem_xcpt, mem_cause, "MEMORY", memCoverCauses)
val dcache_kill_mem = mem_reg_valid && mem_ctrl.wxd && io.dmem.replay_next // structural hazard on writeback port
val fpu_kill_mem = mem_reg_valid && mem_ctrl.fp && io.fpu.nack_mem
val replay_mem = dcache_kill_mem || mem_reg_replay || fpu_kill_mem
@ -458,6 +478,16 @@ class Rocket(implicit p: Parameters) extends CoreModule()(p)
(wb_reg_valid && wb_ctrl.mem && io.dmem.s2_xcpt.ae.ld, UInt(Causes.load_access))
))
val wbCoverCauses = List(
(Causes.misaligned_store, "MISALIGNED_STORE"),
(Causes.misaligned_load, "MISALIGNED_LOAD"),
(Causes.store_page_fault, "STORE_PAGE_FAULT"),
(Causes.load_page_fault, "LOAD_PAGE_FAULT"),
(Causes.store_access, "STORE_ACCESS"),
(Causes.load_access, "LOAD_ACCESS")
)
coverExceptions(wb_xcpt, wb_cause, "WRITEBACK", wbCoverCauses)
val wb_wxd = wb_reg_valid && wb_ctrl.wxd
val wb_set_sboard = wb_ctrl.div || wb_dcache_miss || wb_ctrl.rocc
val replay_wb_common = io.dmem.s2_nack || wb_reg_replay
@ -702,6 +732,12 @@ class Rocket(implicit p: Parameters) extends CoreModule()(p)
def checkExceptions(x: Seq[(Bool, UInt)]) =
(x.map(_._1).reduce(_||_), PriorityMux(x))
def coverExceptions(exceptionValid: Bool, cause: UInt, labelPrefix: String, coverCausesLabels: Seq[(Int, String)]): Unit = {
for ((coverCause, label) <- coverCausesLabels) {
cover(exceptionValid && (cause === UInt(coverCause)), s"${labelPrefix}_${label}")
}
}
def checkHazards(targets: Seq[(Bool, UInt)], cond: UInt => Bool) =
targets.map(h => h._1 && cond(h._2)).reduce(_||_)