access faults now write badvaddr PCR register with faulting address

rocket/src/main/scala/ctrl.scala

@@ -33,11 +33,14 @@ class ioCtrlDpath extends Bundle()
   val sel_wb   = UFix(3, 'output);
   val ren_pcr  = Bool('output);
   val wen_pcr  = Bool('output);
-  val exception = Bool('output);
-  val cause    = UFix(5,'output);
   val eret     = Bool('output);
   val mem_load = Bool('output);
   val wen      = Bool('output);
+  // exception handling
+  val exception = Bool('output);
+  val cause    = UFix(5,'output);
+  val badvaddr_wen = Bool('output); // high for any access fault
+  val badvaddr_sel = Bool('output); // select between instruction PC or load/store addr
   // inputs from datapath
   val btb_hit = Bool('input);
   val inst    = Bits(32, 'input);
@@ -389,7 +392,9 @@ class rocketCtrl extends Component
 	// write cause to PCR on an exception
 	io.dpath.exception := mem_exception;
 	io.dpath.cause     := mem_cause;
-
+	io.dpath.badvaddr_wen := io.xcpt_dtlb_ld || io.xcpt_dtlb_st || mem_reg_xcpt_itlb;
+	io.dpath.badvaddr_sel := mem_reg_xcpt_itlb;
+	
   // replay execute stage PC when the D$ is blocked, when the D$ misses, and for privileged instructions
   val replay_ex = (ex_reg_mem_val && !io.dmem.req_rdy) || io.dmem.resp_miss || mem_reg_privileged;
   

rocket/src/main/scala/dpath.scala

@@ -108,6 +108,7 @@ class rocketDpath extends Component
   // writeback definitions
   val wb_reg_valid          = Reg(resetVal = Bool(false));
   val wb_reg_pc             = Reg(resetVal = UFix(0,VADDR_BITS));
+  val wb_reg_mem_req_addr   = Reg(resetVal = UFix(0,VADDR_BITS));
   val wb_reg_waddr          = Reg(resetVal = UFix(0,5));
   val wb_reg_wdata          = Reg(resetVal = Bits(0,64));
   val wb_reg_ctrl_ll_wb     = Reg(resetVal = Bool(false));
@@ -117,6 +118,8 @@ class rocketDpath extends Component
   val wb_reg_ctrl_exception = Reg(resetVal = Bool(false));
   val wb_reg_ctrl_wen       = Reg(resetVal = Bool(false));
   val wb_reg_ctrl_wen_pcr   = Reg(resetVal = Bool(false));
+  val wb_reg_badvaddr_sel   = Reg(resetVal = Bool(false));
+  val wb_reg_badvaddr_wen   = Reg(resetVal = Bool(false));
 
   val r_dmem_resp_val       = Reg(resetVal = Bool(false));
   val r_dmem_resp_waddr     = Reg(resetVal = UFix(0,5));
@@ -412,6 +415,9 @@ class rocketDpath extends Component
   wb_reg_ctrl_eret      <== mem_reg_ctrl_eret;
   wb_reg_ctrl_exception <== io.ctrl.exception;
   wb_reg_ctrl_cause     <== io.ctrl.cause;
+  wb_reg_mem_req_addr   <== io.dmem.req_addr;
+  wb_reg_badvaddr_wen   <== io.ctrl.badvaddr_wen;
+  wb_reg_badvaddr_sel   <== io.ctrl.badvaddr_sel;
 
   when (io.ctrl.killm) {
     wb_reg_valid          <== Bool(false);
@@ -448,10 +454,13 @@ class rocketDpath extends Component
   pcr.io.w.en   := wb_reg_ctrl_wen_pcr;
   pcr.io.w.data := wb_reg_wdata;
 
-  pcr.io.eret      	:= wb_reg_ctrl_eret;
-  pcr.io.exception 	:= wb_reg_ctrl_exception;
-  pcr.io.cause 			:= wb_reg_ctrl_cause;
-  pcr.io.pc					:= wb_reg_pc;
+  pcr.io.eret      	  := wb_reg_ctrl_eret;
+  pcr.io.exception 	  := wb_reg_ctrl_exception;
+  pcr.io.cause 			  := wb_reg_ctrl_cause;
+  pcr.io.pc					  := wb_reg_pc;
+  pcr.io.ldst_addr    := wb_reg_mem_req_addr;
+  pcr.io.badvaddr_wen := wb_reg_badvaddr_wen;
+  pcr.io.badvaddr_sel := wb_reg_badvaddr_sel;
   
   // temporary debug outputs so things don't get optimized away
   io.debug.id_valid  := id_reg_valid;

rocket/src/main/scala/dpath_util.scala

@@ -40,7 +40,10 @@ class ioDpathPCR extends Bundle()
   val evec      = UFix(VADDR_BITS, 'output);
   val exception = Bool('input);
   val cause 		= UFix(5, 'input);
+  val badvaddr_wen = Bool('input);
+  val badvaddr_sel = Bool('input);
   val pc    		= UFix(VADDR_BITS, 'input);
+  val ldst_addr = UFix(VADDR_BITS, 'input);
   val eret  		= Bool('input);
 }
 
@@ -95,6 +98,10 @@ class rocketDpathPCR extends Component
     }
   }
   
+  when (io.badvaddr_wen) {
+    reg_badvaddr 		<== Mux(io.badvaddr_sel, io.pc, io.ldst_addr);
+  }
+  
   when (io.exception && !reg_status_et) {
   	reg_error_mode <== Bool(true);
   }
@@ -106,7 +113,7 @@ class rocketDpathPCR extends Component
   	reg_epc       <== io.pc;
   	reg_cause     <== io.cause;
   }
-  
+    
   when (!io.exception && io.eret) {
   	reg_status_s  <== reg_status_ps;
   	reg_status_et <== Bool(true);