diff --git a/rocket/src/main/scala/dpath.scala b/rocket/src/main/scala/dpath.scala
index a987b720..c5dd7d5f 100644
--- a/rocket/src/main/scala/dpath.scala
+++ b/rocket/src/main/scala/dpath.scala
@@ -193,6 +193,7 @@ class Datapath(implicit conf: RocketConfiguration) extends Module
   pcr.io.rocc <> io.rocc
   pcr.io.pc := wb_reg_pc
   io.ctrl.csr_replay := pcr.io.replay
+  pcr.io.uarch_counters.foreach(_ := Bool(false))
 
   io.ptw.ptbr := pcr.io.ptbr
   io.ptw.invalidate := pcr.io.fatc
diff --git a/rocket/src/main/scala/dpath_util.scala b/rocket/src/main/scala/dpath_util.scala
index 49da47fe..803d6908 100644
--- a/rocket/src/main/scala/dpath_util.scala
+++ b/rocket/src/main/scala/dpath_util.scala
@@ -99,6 +99,7 @@ class CSRFile(implicit conf: RocketConfiguration) extends Module
     val evec = UInt(OUTPUT, VADDR_BITS+1)
     val exception = Bool(INPUT)
     val retire = UInt(INPUT, log2Up(1+conf.retireWidth))
+    val uarch_counters = Vec.fill(16)(UInt(INPUT, log2Up(1+conf.retireWidth)))
     val cause = UInt(INPUT, conf.xprlen)
     val badvaddr_wen = Bool(INPUT)
     val pc = UInt(INPUT, VADDR_BITS+1)
@@ -125,6 +126,7 @@ class CSRFile(implicit conf: RocketConfiguration) extends Module
   val reg_status = Reg(new Status) // reset down below
   val reg_time = WideCounter(conf.xprlen)
   val reg_instret = WideCounter(conf.xprlen, io.retire)
+  val reg_uarch_counters = io.uarch_counters.map(WideCounter(conf.xprlen, _))
   val reg_fflags = Reg(UInt(width = 5))
   val reg_frm = Reg(UInt(width = 3))
 
@@ -210,7 +212,7 @@ class CSRFile(implicit conf: RocketConfiguration) extends Module
   val read_impl = Bits(2)
   val read_ptbr = reg_ptbr(PADDR_BITS-1,PGIDX_BITS) << PGIDX_BITS
 
-  val read_mapping = Map[Int,Bits](
+  val read_mapping = collection.mutable.Map[Int,Bits](
     CSRs.fflags -> (if (conf.fpu) reg_fflags else UInt(0)),
     CSRs.frm -> (if (conf.fpu) reg_frm else UInt(0)),
     CSRs.fcsr -> (if (conf.fpu) Cat(reg_frm, reg_fflags) else UInt(0)),
@@ -237,6 +239,9 @@ class CSRFile(implicit conf: RocketConfiguration) extends Module
     CSRs.tohost -> reg_tohost,
     CSRs.fromhost -> reg_fromhost)
 
+  for (i <- 0 until reg_uarch_counters.size)
+    read_mapping += (CSRs.uarch0 + i) -> reg_uarch_counters(i)
+
   io.rw.rdata := Mux1H(for ((k, v) <- read_mapping) yield decoded_addr(k) -> v)
 
   io.fcsr_rm := reg_frm
diff --git a/rocket/src/main/scala/instructions.scala b/rocket/src/main/scala/instructions.scala
index 2d91d92c..05d8274d 100644
--- a/rocket/src/main/scala/instructions.scala
+++ b/rocket/src/main/scala/instructions.scala
@@ -219,6 +219,22 @@ object CSRs {
   val fflags = 0x1
   val frm = 0x2
   val fcsr = 0x3
+  val uarch0 = 0x80
+  val uarch1 = 0x81
+  val uarch2 = 0x82
+  val uarch3 = 0x83
+  val uarch4 = 0x84
+  val uarch5 = 0x85
+  val uarch6 = 0x86
+  val uarch7 = 0x87
+  val uarch8 = 0x88
+  val uarch9 = 0x89
+  val uarch10 = 0x8a
+  val uarch11 = 0x8b
+  val uarch12 = 0x8c
+  val uarch13 = 0x8d
+  val uarch14 = 0x8e
+  val uarch15 = 0x8f
   val sup0 = 0x500
   val sup1 = 0x501
   val epc = 0x502
@@ -247,6 +263,22 @@ object CSRs {
     res += fflags
     res += frm
     res += fcsr
+    res += uarch0
+    res += uarch1
+    res += uarch2
+    res += uarch3
+    res += uarch4
+    res += uarch5
+    res += uarch6
+    res += uarch7
+    res += uarch8
+    res += uarch9
+    res += uarch10
+    res += uarch11
+    res += uarch12
+    res += uarch13
+    res += uarch14
+    res += uarch15
     res += sup0
     res += sup1
     res += epc