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//////////////////////////////////////////////////////////////////////
////                                                              ////
////  OR1200's Exception logic                                    ////
////                                                              ////
////  This file is part of the OpenRISC 1200 project              ////
////  http://www.opencores.org/project,or1k                       ////
////                                                              ////
////  Description                                                 ////
////  Handles all OR1K exceptions inside CPU block.               ////
////                                                              ////
////  To Do:                                                      ////
////   - make it smaller and faster                               ////
////                                                              ////
////  Author(s):                                                  ////
////      - Damjan Lampret, lampret@opencores.org                 ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2000 Authors and OPENCORES.ORG                 ////
////                                                              ////
//// This source file may be used and distributed without         ////
//// restriction provided that this copyright statement is not    ////
//// removed from the file and that any derivative work contains  ////
//// the original copyright notice and the associated disclaimer. ////
////                                                              ////
//// This source file is free software; you can redistribute it   ////
//// and/or modify it under the terms of the GNU Lesser General   ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any   ////
//// later version.                                               ////
////                                                              ////
//// This source is distributed in the hope that it will be       ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
//// PURPOSE.  See the GNU Lesser General Public License for more ////
//// details.                                                     ////
////                                                              ////
//// You should have received a copy of the GNU Lesser General    ////
//// Public License along with this source; if not, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
//
// $Log: or1200_except.v,v $
//
// Revision 2.0  2010/06/30 11:00:00  ORSoC
// Major update: 
// Structure reordered and bugs fixed. 
 
// synopsys translate_off
`include "timescale.v"
// synopsys translate_on
`include "or1200_defines.v"
 
`define OR1200_EXCEPTFSM_WIDTH 3
`define OR1200_EXCEPTFSM_IDLE   `OR1200_EXCEPTFSM_WIDTH'd0
`define OR1200_EXCEPTFSM_FLU1   `OR1200_EXCEPTFSM_WIDTH'd1
`define OR1200_EXCEPTFSM_FLU2   `OR1200_EXCEPTFSM_WIDTH'd2
`define OR1200_EXCEPTFSM_FLU3   `OR1200_EXCEPTFSM_WIDTH'd3
`define OR1200_EXCEPTFSM_FLU4   `OR1200_EXCEPTFSM_WIDTH'd4
`define OR1200_EXCEPTFSM_FLU5   `OR1200_EXCEPTFSM_WIDTH'd5
 
//
// Exception recognition and sequencing
//
 
module or1200_except
  (
   // Clock and reset
   clk, rst,
 
   // Internal i/f
   sig_ibuserr, sig_dbuserr, sig_illegal, sig_align, sig_range, sig_dtlbmiss,
   sig_dmmufault, sig_int, sig_syscall, sig_trap, sig_itlbmiss, sig_immufault,
   sig_tick, ex_branch_taken, genpc_freeze, id_freeze, ex_freeze, wb_freeze,
   if_stall,  if_pc, id_pc, ex_pc, wb_pc, id_flushpipe, ex_flushpipe,
   extend_flush, except_flushpipe, except_type, except_start, except_started,
   except_stop, except_trig, ex_void, abort_mvspr, branch_op, spr_dat_ppc,
   spr_dat_npc, datain, du_dsr, epcr_we, eear_we, esr_we, pc_we, epcr, eear,
   du_dmr1, du_hwbkpt, du_hwbkpt_ls_r, esr, sr_we, to_sr, sr, lsu_addr,
   abort_ex, icpu_ack_i, icpu_err_i, dcpu_ack_i, dcpu_err_i, sig_fp, fpcsr_fpee
 
);
 
//
// I/O
//
input                           clk;
input                           rst;
input                           sig_ibuserr;
input                           sig_dbuserr;
input                           sig_illegal;
input                           sig_align;
input                           sig_range;
input                           sig_dtlbmiss;
input                           sig_dmmufault;
input                           sig_int;
input                           sig_syscall;
input                           sig_trap;
input                           sig_itlbmiss;
input                           sig_immufault;
input                           sig_tick;
input                           sig_fp;
input                           fpcsr_fpee;
input                           ex_branch_taken;
input                           genpc_freeze;
input                           id_freeze;
input                           ex_freeze;
input                           wb_freeze;
input                           if_stall;
input   [31:0]           if_pc;
output  [31:0]           id_pc;
output  [31:0]      ex_pc;
output  [31:0]      wb_pc;
input   [31:0]           datain;
input   [`OR1200_DU_DSR_WIDTH-1:0]     du_dsr;
input   [24:0]                       du_dmr1;
input                   du_hwbkpt;
input                   du_hwbkpt_ls_r;
input                           epcr_we;
input                           eear_we;
input                           esr_we;
input                           pc_we;
output  [31:0]                   epcr;
output  [31:0]                   eear;
output  [`OR1200_SR_WIDTH-1:0]   esr;
input   [`OR1200_SR_WIDTH-1:0]   to_sr;
input                           sr_we;
input   [`OR1200_SR_WIDTH-1:0]   sr;
input   [31:0]                   lsu_addr;
input                   id_flushpipe;
input                   ex_flushpipe;
output                          except_flushpipe;
output                          extend_flush;
output  [`OR1200_EXCEPT_WIDTH-1:0]       except_type;
output                          except_start;
output                          except_started;
output  [13:0]           except_stop;
output  [13:0]           except_trig;
input                           ex_void;
input   [`OR1200_BRANCHOP_WIDTH-1:0]    branch_op;
output  [31:0]                   spr_dat_ppc;
output  [31:0]                   spr_dat_npc;
output                          abort_ex;
output              abort_mvspr;
input                           icpu_ack_i;
input                           icpu_err_i;
input                           dcpu_ack_i;
input                           dcpu_err_i;
 
//
// Internal regs and wires
//
reg     [`OR1200_EXCEPT_WIDTH-1:0]       except_type;
reg     [31:0]                   id_pc;
reg                 id_pc_val;
reg     [31:0]                   ex_pc;
reg                 ex_pc_val;
reg     [31:0]                   wb_pc;
reg [31:0]          dl_pc;
reg     [31:0]                   epcr;
reg     [31:0]                   eear;
reg     [`OR1200_SR_WIDTH-1:0]           esr;
reg     [2:0]                    id_exceptflags;
reg     [2:0]                    ex_exceptflags;
reg     [`OR1200_EXCEPTFSM_WIDTH-1:0]    state;
reg                             extend_flush;
reg                             extend_flush_last;
reg                             ex_dslot;
reg                             delayed1_ex_dslot;
reg                             delayed2_ex_dslot;
wire                            except_started;
reg     [2:0]                    delayed_iee;
reg     [2:0]                    delayed_tee;
wire                            int_pending;
wire                            tick_pending;
wire                            fp_pending;
 
reg trace_trap      ;
reg ex_freeze_prev;
reg sr_ted_prev;
reg dsr_te_prev;
reg dmr1_st_prev    ;
reg dmr1_bt_prev    ;
wire dsr_te = ex_freeze_prev ? dsr_te_prev : du_dsr[`OR1200_DU_DSR_TE];
wire sr_ted = ex_freeze_prev ? sr_ted_prev : sr[`OR1200_SR_TED];
wire dmr1_st = ex_freeze_prev ? dmr1_st_prev: du_dmr1[`OR1200_DU_DMR1_ST] ;
wire dmr1_bt = ex_freeze_prev ? dmr1_bt_prev: du_dmr1[`OR1200_DU_DMR1_BT] ;
 
//
// Simple combinatorial logic
//
assign except_started = extend_flush & except_start;
 
assign except_start = (except_type != `OR1200_EXCEPT_NONE) & extend_flush;
 
assign int_pending = sig_int & (sr[`OR1200_SR_IEE] |
                                (sr_we & to_sr[`OR1200_SR_IEE]))
                    & id_pc_val & delayed_iee[2] & ~ex_freeze & ~ex_branch_taken
                     & ~ex_dslot & ~(sr_we & ~to_sr[`OR1200_SR_IEE]);
 
assign tick_pending = sig_tick & (sr[`OR1200_SR_TEE] |
                                  (sr_we & to_sr[`OR1200_SR_TEE])) & id_pc_val
                      & delayed_tee[2] & ~ex_freeze & ~ex_branch_taken
                      & ~ex_dslot & ~(sr_we & ~to_sr[`OR1200_SR_TEE]);
 
assign fp_pending = sig_fp & fpcsr_fpee & ~ex_freeze & ~ex_branch_taken
                    & ~ex_dslot;
 
// Abort write into RF by load & other instructions   
assign abort_ex = sig_dbuserr | sig_dmmufault | sig_dtlbmiss | sig_align |
                  sig_illegal | ((du_hwbkpt | trace_trap) & ex_pc_val
                                 & !sr_ted & !dsr_te);
 
// abort spr read/writes   
assign abort_mvspr  = sig_illegal | ((du_hwbkpt | trace_trap) & ex_pc_val
                                     & !sr_ted & !dsr_te) ;
assign spr_dat_ppc = wb_pc;
 
assign spr_dat_npc = ex_void ? id_pc : ex_pc;
 
//
// Order defines exception detection priority
//
assign except_trig = {
                      ex_exceptflags[1] & ~du_dsr[`OR1200_DU_DSR_IME],
                      ex_exceptflags[0]  & ~du_dsr[`OR1200_DU_DSR_IPFE],
                      ex_exceptflags[2] & ~du_dsr[`OR1200_DU_DSR_BUSEE],
                      sig_illegal       & ~du_dsr[`OR1200_DU_DSR_IIE],
                      sig_align         & ~du_dsr[`OR1200_DU_DSR_AE],
                      sig_dtlbmiss      & ~du_dsr[`OR1200_DU_DSR_DME],
                      sig_trap          & ~du_dsr[`OR1200_DU_DSR_TE],
                      sig_syscall       & ~du_dsr[`OR1200_DU_DSR_SCE] & ~ex_freeze,
                      sig_dmmufault     & ~du_dsr[`OR1200_DU_DSR_DPFE],
                      sig_dbuserr       & ~du_dsr[`OR1200_DU_DSR_BUSEE],
                      sig_range         & ~du_dsr[`OR1200_DU_DSR_RE],
                      fp_pending        & ~du_dsr[`OR1200_DU_DSR_FPE],
                      int_pending       & ~du_dsr[`OR1200_DU_DSR_IE],
                      tick_pending      & ~du_dsr[`OR1200_DU_DSR_TTE]
                      };
 
wire    trace_cond  = !ex_freeze && !ex_void && (1'b0
`ifdef OR1200_DU_DMR1_ST
    ||  dmr1_st
`endif
`ifdef OR1200_DU_DMR1_BT
    ||  ((branch_op != `OR1200_BRANCHOP_NOP) && (branch_op != `OR1200_BRANCHOP_RFE) && dmr1_bt)
`endif
    );
 
assign except_stop = {
                        tick_pending            & du_dsr[`OR1200_DU_DSR_TTE],
                        int_pending             & du_dsr[`OR1200_DU_DSR_IE],
                        ex_exceptflags[1]       & du_dsr[`OR1200_DU_DSR_IME],
                        ex_exceptflags[0]        & du_dsr[`OR1200_DU_DSR_IPFE],
                        ex_exceptflags[2]       & du_dsr[`OR1200_DU_DSR_BUSEE],
                        sig_illegal             & du_dsr[`OR1200_DU_DSR_IIE],
                        sig_align               & du_dsr[`OR1200_DU_DSR_AE],
                        sig_dtlbmiss            & du_dsr[`OR1200_DU_DSR_DME],
                        sig_dmmufault           & du_dsr[`OR1200_DU_DSR_DPFE],
                        sig_dbuserr             & du_dsr[`OR1200_DU_DSR_BUSEE],
                        sig_range               & du_dsr[`OR1200_DU_DSR_RE],
                        sig_trap                & du_dsr[`OR1200_DU_DSR_TE],
                        fp_pending              & du_dsr[`OR1200_DU_DSR_FPE],
                        sig_syscall             & du_dsr[`OR1200_DU_DSR_SCE] & ~ex_freeze
                };
 
always @(posedge clk or posedge rst) begin
        if (rst) begin
                trace_trap  <=  1'b0 ;
        end
        else if (!(trace_trap && !ex_pc_val)) begin
                trace_trap  <=  trace_cond & !dsr_te & !sr_ted ;
        end
end
 
always @(posedge clk or posedge rst) begin
        if (rst) begin
        ex_freeze_prev  <=  1'b0 ;
        sr_ted_prev     <=  1'b0 ;
        dsr_te_prev     <=  1'b0 ;
        dmr1_st_prev    <=  1'b0 ;
        dmr1_bt_prev    <=  1'b0 ;
    end
    else begin
        ex_freeze_prev  <=  ex_freeze ;
        if (!ex_freeze_prev || ex_void) begin
            sr_ted_prev     <=  sr     [`OR1200_SR_TED    ] ;
            dsr_te_prev     <=  du_dsr [`OR1200_DU_DSR_TE ] ;
            dmr1_st_prev    <=  du_dmr1[`OR1200_DU_DMR1_ST] ;
            dmr1_bt_prev    <=  du_dmr1[`OR1200_DU_DMR1_BT] ;
        end
    end
end
 
//
// PC and Exception flags pipelines
//
always @(posedge clk or posedge rst) begin
        if (rst) begin
                id_pc <=  32'd0;
        id_pc_val <=  1'b0 ;
                id_exceptflags <=  3'b000;
        end
        else if (id_flushpipe) begin
        id_pc_val <=  1'b0 ;
                id_exceptflags <=  3'b000;
        end
        else if (!id_freeze) begin
                id_pc <=  if_pc;
        id_pc_val <=  1'b1 ;
                id_exceptflags <=  { sig_ibuserr, sig_itlbmiss, sig_immufault };
        end
end
 
//
// delayed_iee
//
// SR[IEE] should not enable interrupts right away
// when it is restored with l.rfe. Instead delayed_iee
// together with SR[IEE] enables interrupts once
// pipeline is again ready.
//
always @(posedge rst or posedge clk)
        if (rst)
                delayed_iee <=  3'b000;
        else if (!sr[`OR1200_SR_IEE])
                delayed_iee <=  3'b000;
        else
                delayed_iee <=  {delayed_iee[1:0], 1'b1};
 
//
// delayed_tee
//
// SR[TEE] should not enable tick exceptions right away
// when it is restored with l.rfe. Instead delayed_tee
// together with SR[TEE] enables tick exceptions once
// pipeline is again ready.
//
always @(posedge rst or posedge clk)
        if (rst)
                delayed_tee <=  3'b000;
        else if (!sr[`OR1200_SR_TEE])
                delayed_tee <=  3'b000;
        else
                delayed_tee <=  {delayed_tee[1:0], 1'b1};
 
//
// PC and Exception flags pipelines
//
always @(posedge clk or posedge rst) begin
        if (rst) begin
                ex_dslot <=  1'b0;
                ex_pc <=  32'd0;
                ex_pc_val <=  1'b0 ;
                ex_exceptflags <=  3'b000;
                delayed1_ex_dslot <=  1'b0;
                delayed2_ex_dslot <=  1'b0;
        end
        else if (ex_flushpipe) begin
                ex_dslot <=  1'b0;
                ex_pc_val <=  1'b0 ;
                ex_exceptflags <=  3'b000;
                delayed1_ex_dslot <=  1'b0;
                delayed2_ex_dslot <=  1'b0;
        end
        else if (!ex_freeze & id_freeze) begin
                ex_dslot <=  1'b0;
                ex_pc <=  id_pc;
                ex_pc_val <=  id_pc_val ;
                ex_exceptflags <=  3'b000;
                delayed1_ex_dslot <=  ex_dslot;
                delayed2_ex_dslot <=  delayed1_ex_dslot;
        end
        else if (!ex_freeze) begin
                ex_dslot <=  ex_branch_taken;
                ex_pc <=  id_pc;
                ex_pc_val <=  id_pc_val ;
                ex_exceptflags <=  id_exceptflags;
                delayed1_ex_dslot <=  ex_dslot;
                delayed2_ex_dslot <=  delayed1_ex_dslot;
        end
end
 
//
// PC and Exception flags pipelines
//
always @(posedge clk or posedge rst) begin
        if (rst) begin
                wb_pc <=  32'd0;
        dl_pc <=  32'd0;
        end
        else if (!wb_freeze) begin
                wb_pc <=  ex_pc;
        dl_pc <=  wb_pc;
        end
end
 
//
// We have started execution of exception handler:
//  1. Asserted for 3 clock cycles
//  2. Don't execute any instruction that is still in pipeline and is not part of exception handler
//
assign except_flushpipe = |except_trig & ~|state;
 
//
// Exception FSM that sequences execution of exception handler
//
// except_type signals which exception handler we start fetching in:
//  1. Asserted in next clock cycle after exception is recognized
//
   always @(posedge clk or posedge rst) begin
      if (rst) begin
         state <=  `OR1200_EXCEPTFSM_IDLE;
         except_type <=  `OR1200_EXCEPT_NONE;
         extend_flush <=  1'b0;
         epcr <=  32'b0;
         eear <=  32'b0;
         esr <=  {2'h1, {`OR1200_SR_WIDTH-3{1'b0}}, 1'b1};
         extend_flush_last <=  1'b0;
      end
      else begin
`ifdef OR1200_CASE_DEFAULT
         case (state)   // synopsys parallel_case
`else
           case (state) // synopsys full_case parallel_case
`endif
             `OR1200_EXCEPTFSM_IDLE:
               if (except_flushpipe) begin
                  state <=  `OR1200_EXCEPTFSM_FLU1;
                  extend_flush <=  1'b1;
                  esr <=  sr_we ? to_sr : sr;
                  casex (except_trig)
`ifdef OR1200_EXCEPT_ITLBMISS
                    14'b1x_xxxx_xxxx_xxxx: begin
                       except_type <=  `OR1200_EXCEPT_ITLBMISS;
                       eear <=  ex_dslot ?
                               ex_pc : ex_pc;
                       epcr <=  ex_dslot ?
                               wb_pc : ex_pc;
                    end
`endif
`ifdef OR1200_EXCEPT_IPF
                    14'b01_xxxx_xxxx_xxxx: begin
                       except_type <=  `OR1200_EXCEPT_IPF;
                       eear <=  ex_dslot ?
                               ex_pc : delayed1_ex_dslot ?
                               id_pc : delayed2_ex_dslot ?
                               id_pc : id_pc;
                       epcr <=  ex_dslot ?
                               wb_pc : delayed1_ex_dslot ?
                               id_pc : delayed2_ex_dslot ?
                               id_pc : id_pc;
                    end
`endif
`ifdef OR1200_EXCEPT_BUSERR
                    14'b00_1xxx_xxxx_xxxx: begin        // Insn. Bus Error
                       except_type <=  `OR1200_EXCEPT_BUSERR;
                       eear <=  ex_dslot ?
                               wb_pc : ex_pc;
                       epcr <=  ex_dslot ?
                               wb_pc : ex_pc;
                    end
`endif
`ifdef OR1200_EXCEPT_ILLEGAL
                    14'b00_01xx_xxxx_xxxx: begin
                       except_type <=  `OR1200_EXCEPT_ILLEGAL;
                       eear <=  ex_pc;
                       epcr <=  ex_dslot ?
                               wb_pc : ex_pc;
                    end
`endif
`ifdef OR1200_EXCEPT_ALIGN
                    14'b00_001x_xxxx_xxxx: begin
                       except_type <=  `OR1200_EXCEPT_ALIGN;
                       eear <=  lsu_addr;
                       epcr <=  ex_dslot ?
                               wb_pc : ex_pc;
                    end
`endif
`ifdef OR1200_EXCEPT_DTLBMISS
                    14'b00_0001_xxxx_xxxx: begin
                       except_type <=  `OR1200_EXCEPT_DTLBMISS;
                       eear <=  lsu_addr;
                       epcr <=  ex_dslot ?
                               wb_pc : delayed1_ex_dslot ?
                               dl_pc : ex_pc;
                    end
`endif
`ifdef OR1200_EXCEPT_TRAP
                    14'b00_0000_1xxx_xxxx: begin
                       except_type <=  `OR1200_EXCEPT_TRAP;
                       epcr <=  ex_dslot ?
                               wb_pc : delayed1_ex_dslot ?
                               id_pc : ex_pc;
                    end
`endif
`ifdef OR1200_EXCEPT_SYSCALL
                    14'b00_0000_01xx_xxxx: begin
                       except_type <=  `OR1200_EXCEPT_SYSCALL;
                       epcr <=  ex_dslot ?
                               wb_pc : delayed1_ex_dslot ?
                               id_pc : delayed2_ex_dslot ?
                               id_pc : id_pc;
                    end
`endif
`ifdef OR1200_EXCEPT_DPF
                    14'b00_0000_001x_xxxx: begin
                       except_type <=  `OR1200_EXCEPT_DPF;
                       eear <=  lsu_addr;
                       epcr <=  ex_dslot ?
                               wb_pc : delayed1_ex_dslot ?
                               dl_pc : ex_pc;
                    end
`endif
`ifdef OR1200_EXCEPT_BUSERR
                    14'b00_0000_0001_xxxx: begin        // Data Bus Error
                       except_type <=  `OR1200_EXCEPT_BUSERR;
                       eear <=  lsu_addr;
                       epcr <=  ex_dslot ?
                               wb_pc : delayed1_ex_dslot ?
                               dl_pc : ex_pc;
                    end
`endif
`ifdef OR1200_EXCEPT_RANGE
                    14'b00_0000_0000_1xxx: begin
                       except_type <=  `OR1200_EXCEPT_RANGE;
                       epcr <=  ex_dslot ?
                               wb_pc : delayed1_ex_dslot ?
                               id_pc : delayed2_ex_dslot ?
                               id_pc : id_pc;
                    end
`endif
`ifdef OR1200_EXCEPT_FLOAT
                    14'b00_0000_0000_01xx: begin
                       except_type <=  `OR1200_EXCEPT_FLOAT;
                       epcr <=  id_pc;
                    end
`endif
`ifdef OR1200_EXCEPT_INT
                    14'b00_0000_0000_001x: begin
                       except_type <=  `OR1200_EXCEPT_INT;
                       epcr <=  id_pc;
                    end
`endif
`ifdef OR1200_EXCEPT_TICK
                    14'b00_0000_0000_0001: begin
                       except_type <=  `OR1200_EXCEPT_TICK;
                       epcr <=  id_pc;
                    end
`endif
                    default:
                      except_type <=  `OR1200_EXCEPT_NONE;
                  endcase
               end
               else if (pc_we) begin
                  state <=  `OR1200_EXCEPTFSM_FLU1;
                  extend_flush <=  1'b1;
               end
               else begin
                  if (epcr_we)
                    epcr <=  datain;
                  if (eear_we)
                    eear <=  datain;
                  if (esr_we)
                    esr <=  {datain[`OR1200_SR_WIDTH-1], 1'b1, datain[`OR1200_SR_WIDTH-3:0]};
               end
             `OR1200_EXCEPTFSM_FLU1:
               if (icpu_ack_i | icpu_err_i | genpc_freeze)
                 state <=  `OR1200_EXCEPTFSM_FLU2;
             `OR1200_EXCEPTFSM_FLU2:
`ifdef OR1200_EXCEPT_TRAP
               if (except_type == `OR1200_EXCEPT_TRAP) begin
                  state <=  `OR1200_EXCEPTFSM_IDLE;
                  extend_flush <=  1'b0;
                  extend_flush_last <=  1'b0;
                  except_type <=  `OR1200_EXCEPT_NONE;
               end
               else
`endif
                 state <=  `OR1200_EXCEPTFSM_FLU3;
             `OR1200_EXCEPTFSM_FLU3:
               begin
                  state <=  `OR1200_EXCEPTFSM_FLU4;
               end
             `OR1200_EXCEPTFSM_FLU4: begin
                state <=  `OR1200_EXCEPTFSM_FLU5;
                extend_flush <=  1'b0;
                extend_flush_last <=  1'b0; // damjan
             end
`ifdef OR1200_CASE_DEFAULT
             default: begin
`else
                `OR1200_EXCEPTFSM_FLU5: begin
`endif
                   if (!if_stall && !id_freeze) begin
                      state <=  `OR1200_EXCEPTFSM_IDLE;
                      except_type <=  `OR1200_EXCEPT_NONE;
                      extend_flush_last <=  1'b0;
                   end
                end
           endcase
         end
   end
 
endmodule

Line No.	Rev	Author	Line
1	10	unneback	`//////////////////////////////////////////////////////////////////////`
2			`//// ////`
3			`//// OR1200's Exception logic ////`
4			`//// ////`
5			`//// This file is part of the OpenRISC 1200 project ////`
6	185	julius	`//// http://www.opencores.org/project,or1k ////`
7	10	unneback	`//// ////`
8			`//// Description ////`
9			`//// Handles all OR1K exceptions inside CPU block. ////`
10			`//// ////`
11			`//// To Do: ////`
12			`//// - make it smaller and faster ////`
13			`//// ////`
14			`//// Author(s): ////`
15			`//// - Damjan Lampret, lampret@opencores.org ////`
16			`//// ////`
17			`//////////////////////////////////////////////////////////////////////`
18			`//// ////`
19			`//// Copyright (C) 2000 Authors and OPENCORES.ORG ////`
20			`//// ////`
21			`//// This source file may be used and distributed without ////`
22			`//// restriction provided that this copyright statement is not ////`
23			`//// removed from the file and that any derivative work contains ////`
24			`//// the original copyright notice and the associated disclaimer. ////`
25			`//// ////`
26			`//// This source file is free software; you can redistribute it ////`
27			`//// and/or modify it under the terms of the GNU Lesser General ////`
28			`//// Public License as published by the Free Software Foundation; ////`
29			`//// either version 2.1 of the License, or (at your option) any ////`
30			`//// later version. ////`
31			`//// ////`
32			`//// This source is distributed in the hope that it will be ////`
33			`//// useful, but WITHOUT ANY WARRANTY; without even the implied ////`
34			`//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////`
35			`//// PURPOSE. See the GNU Lesser General Public License for more ////`
36			`//// details. ////`
37			`//// ////`
38			`//// You should have received a copy of the GNU Lesser General ////`
39			`//// Public License along with this source; if not, download it ////`
40			`//// from http://www.opencores.org/lgpl.shtml ////`
41			`//// ////`
42			`//////////////////////////////////////////////////////////////////////`
43			`//`
44	151	marcus.erl	`// $Log: or1200_except.v,v $`
45	10	unneback	`//`
46	141	marcus.erl	`// Revision 2.0 2010/06/30 11:00:00 ORSoC`
47			`// Major update:`
48			`// Structure reordered and bugs fixed.`
49	10	unneback
50			`// synopsys translate_off`
51			`include "timescale.v"
52			`// synopsys translate_on`
53			`include "or1200_defines.v"
54
55			`define OR1200_EXCEPTFSM_WIDTH 3
56			`define OR1200_EXCEPTFSM_IDLE `OR1200_EXCEPTFSM_WIDTH'd0
57			`define OR1200_EXCEPTFSM_FLU1 `OR1200_EXCEPTFSM_WIDTH'd1
58			`define OR1200_EXCEPTFSM_FLU2 `OR1200_EXCEPTFSM_WIDTH'd2
59			`define OR1200_EXCEPTFSM_FLU3 `OR1200_EXCEPTFSM_WIDTH'd3
60			`define OR1200_EXCEPTFSM_FLU4 `OR1200_EXCEPTFSM_WIDTH'd4
61			`define OR1200_EXCEPTFSM_FLU5 `OR1200_EXCEPTFSM_WIDTH'd5
62
63			`//`
64			`// Exception recognition and sequencing`
65			`//`
66
67	185	julius	`module or1200_except`
68			`(`
69			`// Clock and reset`
70			`clk, rst,`
71
72			`// Internal i/f`
73			`sig_ibuserr, sig_dbuserr, sig_illegal, sig_align, sig_range, sig_dtlbmiss,`
74			`sig_dmmufault, sig_int, sig_syscall, sig_trap, sig_itlbmiss, sig_immufault,`
75			`sig_tick, ex_branch_taken, genpc_freeze, id_freeze, ex_freeze, wb_freeze,`
76			`if_stall, if_pc, id_pc, ex_pc, wb_pc, id_flushpipe, ex_flushpipe,`
77			`extend_flush, except_flushpipe, except_type, except_start, except_started,`
78			`except_stop, except_trig, ex_void, abort_mvspr, branch_op, spr_dat_ppc,`
79			`spr_dat_npc, datain, du_dsr, epcr_we, eear_we, esr_we, pc_we, epcr, eear,`
80			`du_dmr1, du_hwbkpt, du_hwbkpt_ls_r, esr, sr_we, to_sr, sr, lsu_addr,`
81			`abort_ex, icpu_ack_i, icpu_err_i, dcpu_ack_i, dcpu_err_i, sig_fp, fpcsr_fpee`
82
83	10	unneback	`);`
84
85			`//`
86			`// I/O`
87			`//`
88			`input clk;`
89			`input rst;`
90			`input sig_ibuserr;`
91			`input sig_dbuserr;`
92			`input sig_illegal;`
93			`input sig_align;`
94			`input sig_range;`
95			`input sig_dtlbmiss;`
96			`input sig_dmmufault;`
97			`input sig_int;`
98			`input sig_syscall;`
99			`input sig_trap;`
100			`input sig_itlbmiss;`
101			`input sig_immufault;`
102			`input sig_tick;`
103	185	julius	`input sig_fp;`
104			`input fpcsr_fpee;`
105	141	marcus.erl	`input ex_branch_taken;`
106	10	unneback	`input genpc_freeze;`
107			`input id_freeze;`
108			`input ex_freeze;`
109			`input wb_freeze;`
110			`input if_stall;`
111	141	marcus.erl	`input [31:0] if_pc;`
112			`output [31:0] id_pc;`
113			`output [31:0] ex_pc;`
114			`output [31:0] wb_pc;`
115			`input [31:0] datain;`
116	10	unneback	input [`OR1200_DU_DSR_WIDTH-1:0] du_dsr;
117	141	marcus.erl	`input [24:0] du_dmr1;`
118			`input du_hwbkpt;`
119			`input du_hwbkpt_ls_r;`
120	10	unneback	`input epcr_we;`
121			`input eear_we;`
122			`input esr_we;`
123			`input pc_we;`
124			`output [31:0] epcr;`
125			`output [31:0] eear;`
126			output [`OR1200_SR_WIDTH-1:0] esr;
127			input [`OR1200_SR_WIDTH-1:0] to_sr;
128			`input sr_we;`
129			input [`OR1200_SR_WIDTH-1:0] sr;
130			`input [31:0] lsu_addr;`
131	141	marcus.erl	`input id_flushpipe;`
132			`input ex_flushpipe;`
133			`output except_flushpipe;`
134	10	unneback	`output extend_flush;`
135			output [`OR1200_EXCEPT_WIDTH-1:0] except_type;
136			`output except_start;`
137			`output except_started;`
138	185	julius	`output [13:0] except_stop;`
139			`output [13:0] except_trig;`
140	10	unneback	`input ex_void;`
141	141	marcus.erl	input [`OR1200_BRANCHOP_WIDTH-1:0] branch_op;
142	10	unneback	`output [31:0] spr_dat_ppc;`
143			`output [31:0] spr_dat_npc;`
144			`output abort_ex;`
145	141	marcus.erl	`output abort_mvspr;`
146	10	unneback	`input icpu_ack_i;`
147			`input icpu_err_i;`
148			`input dcpu_ack_i;`
149			`input dcpu_err_i;`
150
151			`//`
152			`// Internal regs and wires`
153			`//`
154			reg [`OR1200_EXCEPT_WIDTH-1:0] except_type;
155			`reg [31:0] id_pc;`
156	141	marcus.erl	`reg id_pc_val;`
157	10	unneback	`reg [31:0] ex_pc;`
158	141	marcus.erl	`reg ex_pc_val;`
159	10	unneback	`reg [31:0] wb_pc;`
160	141	marcus.erl	`reg [31:0] dl_pc;`
161	10	unneback	`reg [31:0] epcr;`
162			`reg [31:0] eear;`
163			reg [`OR1200_SR_WIDTH-1:0] esr;
164			`reg [2:0] id_exceptflags;`
165			`reg [2:0] ex_exceptflags;`
166			reg [`OR1200_EXCEPTFSM_WIDTH-1:0] state;
167			`reg extend_flush;`
168			`reg extend_flush_last;`
169			`reg ex_dslot;`
170			`reg delayed1_ex_dslot;`
171			`reg delayed2_ex_dslot;`
172			`wire except_started;`
173			`reg [2:0] delayed_iee;`
174			`reg [2:0] delayed_tee;`
175			`wire int_pending;`
176			`wire tick_pending;`
177	185	julius	`wire fp_pending;`
178
179	141	marcus.erl	`reg trace_trap ;`
180			`reg ex_freeze_prev;`
181			`reg sr_ted_prev;`
182			`reg dsr_te_prev;`
183			`reg dmr1_st_prev ;`
184			`reg dmr1_bt_prev ;`
185			wire dsr_te = ex_freeze_prev ? dsr_te_prev : du_dsr[`OR1200_DU_DSR_TE];
186			wire sr_ted = ex_freeze_prev ? sr_ted_prev : sr[`OR1200_SR_TED];
187			wire dmr1_st = ex_freeze_prev ? dmr1_st_prev: du_dmr1[`OR1200_DU_DMR1_ST] ;
188			wire dmr1_bt = ex_freeze_prev ? dmr1_bt_prev: du_dmr1[`OR1200_DU_DMR1_BT] ;
189	10	unneback
190			`//`
191			`// Simple combinatorial logic`
192			`//`
193			`assign except_started = extend_flush & except_start;`
194	185	julius
195	141	marcus.erl	assign except_start = (except_type != `OR1200_EXCEPT_NONE) & extend_flush;
196	185	julius
197			assign int_pending = sig_int & (sr[`OR1200_SR_IEE] \|
198			(sr_we & to_sr[`OR1200_SR_IEE]))
199			`& id_pc_val & delayed_iee[2] & ~ex_freeze & ~ex_branch_taken`
200			& ~ex_dslot & ~(sr_we & ~to_sr[`OR1200_SR_IEE]);
201
202			assign tick_pending = sig_tick & (sr[`OR1200_SR_TEE] \|
203			(sr_we & to_sr[`OR1200_SR_TEE])) & id_pc_val
204			`& delayed_tee[2] & ~ex_freeze & ~ex_branch_taken`
205			& ~ex_dslot & ~(sr_we & ~to_sr[`OR1200_SR_TEE]);
206
207			`assign fp_pending = sig_fp & fpcsr_fpee & ~ex_freeze & ~ex_branch_taken`
208			`& ~ex_dslot;`
209
210			`// Abort write into RF by load & other instructions`
211			`assign abort_ex = sig_dbuserr \| sig_dmmufault \| sig_dtlbmiss \| sig_align \|`
212			`sig_illegal \| ((du_hwbkpt \| trace_trap) & ex_pc_val`
213			`& !sr_ted & !dsr_te);`
214
215			`// abort spr read/writes`
216			`assign abort_mvspr = sig_illegal \| ((du_hwbkpt \| trace_trap) & ex_pc_val`
217			`& !sr_ted & !dsr_te) ;`
218	10	unneback	`assign spr_dat_ppc = wb_pc;`
219	185	julius
220	10	unneback	`assign spr_dat_npc = ex_void ? id_pc : ex_pc;`
221
222			`//`
223			`// Order defines exception detection priority`
224			`//`
225			`assign except_trig = {`
226	151	marcus.erl	ex_exceptflags[1] & ~du_dsr[`OR1200_DU_DSR_IME],
227			ex_exceptflags[0] & ~du_dsr[`OR1200_DU_DSR_IPFE],
228			ex_exceptflags[2] & ~du_dsr[`OR1200_DU_DSR_BUSEE],
229	185	julius	sig_illegal & ~du_dsr[`OR1200_DU_DSR_IIE],
230	151	marcus.erl	sig_align & ~du_dsr[`OR1200_DU_DSR_AE],
231	185	julius	sig_dtlbmiss & ~du_dsr[`OR1200_DU_DSR_DME],
232	151	marcus.erl	sig_trap & ~du_dsr[`OR1200_DU_DSR_TE],
233	185	julius	sig_syscall & ~du_dsr[`OR1200_DU_DSR_SCE] & ~ex_freeze,
234			sig_dmmufault & ~du_dsr[`OR1200_DU_DSR_DPFE],
235			sig_dbuserr & ~du_dsr[`OR1200_DU_DSR_BUSEE],
236	151	marcus.erl	sig_range & ~du_dsr[`OR1200_DU_DSR_RE],
237	185	julius	fp_pending & ~du_dsr[`OR1200_DU_DSR_FPE],
238			int_pending & ~du_dsr[`OR1200_DU_DSR_IE],
239			tick_pending & ~du_dsr[`OR1200_DU_DSR_TTE]
240	151	marcus.erl	`};`
241	185	julius
242	141	marcus.erl	`wire trace_cond = !ex_freeze && !ex_void && (1'b0`
243			`ifdef OR1200_DU_DMR1_ST
244			`\|\| dmr1_st`
245			`endif
246			`ifdef OR1200_DU_DMR1_BT
247			\|\| ((branch_op != `OR1200_BRANCHOP_NOP) && (branch_op != `OR1200_BRANCHOP_RFE) && dmr1_bt)
248			`endif
249			`);`
250
251	10	unneback	`assign except_stop = {`
252			tick_pending & du_dsr[`OR1200_DU_DSR_TTE],
253			int_pending & du_dsr[`OR1200_DU_DSR_IE],
254			ex_exceptflags[1] & du_dsr[`OR1200_DU_DSR_IME],
255			ex_exceptflags[0] & du_dsr[`OR1200_DU_DSR_IPFE],
256			ex_exceptflags[2] & du_dsr[`OR1200_DU_DSR_BUSEE],
257			sig_illegal & du_dsr[`OR1200_DU_DSR_IIE],
258			sig_align & du_dsr[`OR1200_DU_DSR_AE],
259			sig_dtlbmiss & du_dsr[`OR1200_DU_DSR_DME],
260			sig_dmmufault & du_dsr[`OR1200_DU_DSR_DPFE],
261			sig_dbuserr & du_dsr[`OR1200_DU_DSR_BUSEE],
262			sig_range & du_dsr[`OR1200_DU_DSR_RE],
263	141	marcus.erl	sig_trap & du_dsr[`OR1200_DU_DSR_TE],
264	185	julius	fp_pending & du_dsr[`OR1200_DU_DSR_FPE],
265	10	unneback	sig_syscall & du_dsr[`OR1200_DU_DSR_SCE] & ~ex_freeze
266			`};`
267
268	141	marcus.erl	`always @(posedge clk or posedge rst) begin`
269			`if (rst) begin`
270	258	julius	`trace_trap <= 1'b0 ;`
271	141	marcus.erl	`end`
272			`else if (!(trace_trap && !ex_pc_val)) begin`
273	258	julius	`trace_trap <= trace_cond & !dsr_te & !sr_ted ;`
274	141	marcus.erl	`end`
275			`end`
276
277			`always @(posedge clk or posedge rst) begin`
278			`if (rst) begin`
279	258	julius	`ex_freeze_prev <= 1'b0 ;`
280			`sr_ted_prev <= 1'b0 ;`
281			`dsr_te_prev <= 1'b0 ;`
282			`dmr1_st_prev <= 1'b0 ;`
283			`dmr1_bt_prev <= 1'b0 ;`
284	141	marcus.erl	`end`
285			`else begin`
286	258	julius	`ex_freeze_prev <= ex_freeze ;`
287	141	marcus.erl	`if (!ex_freeze_prev \|\| ex_void) begin`
288	258	julius	sr_ted_prev <= sr [`OR1200_SR_TED ] ;
289			dsr_te_prev <= du_dsr [`OR1200_DU_DSR_TE ] ;
290			dmr1_st_prev <= du_dmr1[`OR1200_DU_DMR1_ST] ;
291			dmr1_bt_prev <= du_dmr1[`OR1200_DU_DMR1_BT] ;
292	141	marcus.erl	`end`
293			`end`
294			`end`
295
296	10	unneback	`//`
297			`// PC and Exception flags pipelines`
298			`//`
299			`always @(posedge clk or posedge rst) begin`
300			`if (rst) begin`
301	258	julius	`id_pc <= 32'd0;`
302			`id_pc_val <= 1'b0 ;`
303			`id_exceptflags <= 3'b000;`
304	10	unneback	`end`
305	141	marcus.erl	`else if (id_flushpipe) begin`
306	258	julius	`id_pc_val <= 1'b0 ;`
307			`id_exceptflags <= 3'b000;`
308	10	unneback	`end`
309			`else if (!id_freeze) begin`
310	258	julius	`id_pc <= if_pc;`
311			`id_pc_val <= 1'b1 ;`
312			`id_exceptflags <= { sig_ibuserr, sig_itlbmiss, sig_immufault };`
313	10	unneback	`end`
314			`end`
315
316			`//`
317			`// delayed_iee`
318			`//`
319			`// SR[IEE] should not enable interrupts right away`
320			`// when it is restored with l.rfe. Instead delayed_iee`
321			`// together with SR[IEE] enables interrupts once`
322			`// pipeline is again ready.`
323			`//`
324			`always @(posedge rst or posedge clk)`
325			`if (rst)`
326	258	julius	`delayed_iee <= 3'b000;`
327	10	unneback	else if (!sr[`OR1200_SR_IEE])
328	258	julius	`delayed_iee <= 3'b000;`
329	10	unneback	`else`
330	258	julius	`delayed_iee <= {delayed_iee[1:0], 1'b1};`
331	10	unneback
332			`//`
333			`// delayed_tee`
334			`//`
335			`// SR[TEE] should not enable tick exceptions right away`
336			`// when it is restored with l.rfe. Instead delayed_tee`
337			`// together with SR[TEE] enables tick exceptions once`
338			`// pipeline is again ready.`
339			`//`
340			`always @(posedge rst or posedge clk)`
341			`if (rst)`
342	258	julius	`delayed_tee <= 3'b000;`
343	10	unneback	else if (!sr[`OR1200_SR_TEE])
344	258	julius	`delayed_tee <= 3'b000;`
345	10	unneback	`else`
346	258	julius	`delayed_tee <= {delayed_tee[1:0], 1'b1};`
347	10	unneback
348			`//`
349			`// PC and Exception flags pipelines`
350			`//`
351			`always @(posedge clk or posedge rst) begin`
352			`if (rst) begin`
353	258	julius	`ex_dslot <= 1'b0;`
354			`ex_pc <= 32'd0;`
355			`ex_pc_val <= 1'b0 ;`
356			`ex_exceptflags <= 3'b000;`
357			`delayed1_ex_dslot <= 1'b0;`
358			`delayed2_ex_dslot <= 1'b0;`
359	10	unneback	`end`
360	141	marcus.erl	`else if (ex_flushpipe) begin`
361	258	julius	`ex_dslot <= 1'b0;`
362			`ex_pc_val <= 1'b0 ;`
363			`ex_exceptflags <= 3'b000;`
364			`delayed1_ex_dslot <= 1'b0;`
365			`delayed2_ex_dslot <= 1'b0;`
366	10	unneback	`end`
367			`else if (!ex_freeze & id_freeze) begin`
368	258	julius	`ex_dslot <= 1'b0;`
369			`ex_pc <= id_pc;`
370			`ex_pc_val <= id_pc_val ;`
371			`ex_exceptflags <= 3'b000;`
372			`delayed1_ex_dslot <= ex_dslot;`
373			`delayed2_ex_dslot <= delayed1_ex_dslot;`
374	10	unneback	`end`
375			`else if (!ex_freeze) begin`
376	258	julius	`ex_dslot <= ex_branch_taken;`
377			`ex_pc <= id_pc;`
378			`ex_pc_val <= id_pc_val ;`
379			`ex_exceptflags <= id_exceptflags;`
380			`delayed1_ex_dslot <= ex_dslot;`
381			`delayed2_ex_dslot <= delayed1_ex_dslot;`
382	10	unneback	`end`
383			`end`
384
385			`//`
386			`// PC and Exception flags pipelines`
387			`//`
388			`always @(posedge clk or posedge rst) begin`
389			`if (rst) begin`
390	258	julius	`wb_pc <= 32'd0;`
391			`dl_pc <= 32'd0;`
392	10	unneback	`end`
393			`else if (!wb_freeze) begin`
394	258	julius	`wb_pc <= ex_pc;`
395			`dl_pc <= wb_pc;`
396	10	unneback	`end`
397			`end`
398
399			`//`
400			`// We have started execution of exception handler:`
401			`// 1. Asserted for 3 clock cycles`
402			`// 2. Don't execute any instruction that is still in pipeline and is not part of exception handler`
403			`//`
404			`assign except_flushpipe = \|except_trig & ~\|state;`
405
406			`//`
407			`// Exception FSM that sequences execution of exception handler`
408			`//`
409			`// except_type signals which exception handler we start fetching in:`
410			`// 1. Asserted in next clock cycle after exception is recognized`
411			`//`
412	185	julius	`always @(posedge clk or posedge rst) begin`
413			`if (rst) begin`
414	258	julius	state <= `OR1200_EXCEPTFSM_IDLE;
415			except_type <= `OR1200_EXCEPT_NONE;
416			`extend_flush <= 1'b0;`
417			`epcr <= 32'b0;`
418			`eear <= 32'b0;`
419			esr <= {2'h1, {`OR1200_SR_WIDTH-3{1'b0}}, 1'b1};
420			`extend_flush_last <= 1'b0;`
421	185	julius	`end`
422			`else begin`
423	10	unneback	`ifdef OR1200_CASE_DEFAULT
424	185	julius	`case (state) // synopsys parallel_case`
425	10	unneback	`else
426	185	julius	`case (state) // synopsys full_case parallel_case`
427	10	unneback	`endif
428	185	julius	`OR1200_EXCEPTFSM_IDLE:
429			`if (except_flushpipe) begin`
430	258	julius	state <= `OR1200_EXCEPTFSM_FLU1;
431			`extend_flush <= 1'b1;`
432			`esr <= sr_we ? to_sr : sr;`
433	185	julius	`casex (except_trig)`
434	151	marcus.erl	`ifdef OR1200_EXCEPT_ITLBMISS
435	185	julius	`14'b1x_xxxx_xxxx_xxxx: begin`
436	258	julius	except_type <= `OR1200_EXCEPT_ITLBMISS;
437			`eear <= ex_dslot ?`
438	185	julius	`ex_pc : ex_pc;`
439	258	julius	`epcr <= ex_dslot ?`
440	185	julius	`wb_pc : ex_pc;`
441			`end`
442	10	unneback	`endif
443			`ifdef OR1200_EXCEPT_IPF
444	185	julius	`14'b01_xxxx_xxxx_xxxx: begin`
445	258	julius	except_type <= `OR1200_EXCEPT_IPF;
446			`eear <= ex_dslot ?`
447	185	julius	`ex_pc : delayed1_ex_dslot ?`
448			`id_pc : delayed2_ex_dslot ?`
449			`id_pc : id_pc;`
450	258	julius	`epcr <= ex_dslot ?`
451	185	julius	`wb_pc : delayed1_ex_dslot ?`
452			`id_pc : delayed2_ex_dslot ?`
453			`id_pc : id_pc;`
454			`end`
455	10	unneback	`endif
456			`ifdef OR1200_EXCEPT_BUSERR
457	185	julius	`14'b00_1xxx_xxxx_xxxx: begin // Insn. Bus Error`
458	258	julius	except_type <= `OR1200_EXCEPT_BUSERR;
459			`eear <= ex_dslot ?`
460	185	julius	`wb_pc : ex_pc;`
461	258	julius	`epcr <= ex_dslot ?`
462	185	julius	`wb_pc : ex_pc;`
463			`end`
464	10	unneback	`endif
465			`ifdef OR1200_EXCEPT_ILLEGAL
466	185	julius	`14'b00_01xx_xxxx_xxxx: begin`
467	258	julius	except_type <= `OR1200_EXCEPT_ILLEGAL;
468			`eear <= ex_pc;`
469			`epcr <= ex_dslot ?`
470	185	julius	`wb_pc : ex_pc;`
471			`end`
472	10	unneback	`endif
473			`ifdef OR1200_EXCEPT_ALIGN
474	185	julius	`14'b00_001x_xxxx_xxxx: begin`
475	258	julius	except_type <= `OR1200_EXCEPT_ALIGN;
476			`eear <= lsu_addr;`
477			`epcr <= ex_dslot ?`
478	185	julius	`wb_pc : ex_pc;`
479			`end`
480	10	unneback	`endif
481			`ifdef OR1200_EXCEPT_DTLBMISS
482	185	julius	`14'b00_0001_xxxx_xxxx: begin`
483	258	julius	except_type <= `OR1200_EXCEPT_DTLBMISS;
484			`eear <= lsu_addr;`
485			`epcr <= ex_dslot ?`
486	185	julius	`wb_pc : delayed1_ex_dslot ?`
487			`dl_pc : ex_pc;`
488			`end`
489	10	unneback	`endif
490	185	julius	`ifdef OR1200_EXCEPT_TRAP
491			`14'b00_0000_1xxx_xxxx: begin`
492	258	julius	except_type <= `OR1200_EXCEPT_TRAP;
493			`epcr <= ex_dslot ?`
494	185	julius	`wb_pc : delayed1_ex_dslot ?`
495			`id_pc : ex_pc;`
496			`end`
497	151	marcus.erl	`endif
498			`ifdef OR1200_EXCEPT_SYSCALL
499	185	julius	`14'b00_0000_01xx_xxxx: begin`
500	258	julius	except_type <= `OR1200_EXCEPT_SYSCALL;

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