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//////////////////////////////////////////////////////////////////////
////                                                              ////
////  or1200_monitor.v                                            ////
////                                                              ////
////  OR1200 processor monitor module                             ////
////                                                              ////
////  Author(s):                                                  ////
////      - Damjan Lampret, lampret@opencores.org                 ////
////      - Julius Baxter, julius@opencores.org                   ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2009, 2010 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                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
 
`include "timescale.v"
`include "or1200_defines.v"
`include "or1200_monitor_defines.v"
`include "test-defines.v"
 
 
module or1200_monitor;
 
   integer fexe;
   integer finsn;
 
   reg [23:0] ref;
`ifdef OR1200_MONITOR_SPRS
   integer    fspr;
`endif
   integer    fgeneral;
`ifdef OR1200_MONITOR_LOOKUP
   integer    flookup;
`endif
   integer    r3;
   integer    insns;
 
 
   //
   // Initialization
   //
   initial begin
      ref = 0;
`ifdef OR1200_MONITOR_EXEC_STATE
      fexe = $fopen({"../out/",`TEST_NAME_STRING,"-executed.log"});
`endif
`ifdef OR1200_MONITOR_EXEC_LOG_DISASSEMBLY
      finsn = fexe;
`endif
      $timeformat (-9, 2, " ns", 12);
`ifdef OR1200_MONITOR_SPRS
      fspr = $fopen({"../out/",`TEST_NAME_STRING,"-sprs.log"});
`endif
      fgeneral = $fopen({"../out/",`TEST_NAME_STRING,"-general.log"});
`ifdef OR1200_MONITOR_LOOKUP
      flookup = $fopen({"../out/",`TEST_NAME_STRING,"-lookup.log"});
`endif
      insns = 0;
 
   end
 
   //
   // Get GPR
   //
   task get_gpr;
      input     [4:0]    gpr_no;
      output [31:0]      gpr;
      integer           j;
      begin
 
`ifdef OR1200_RFRAM_GENERIC
         for(j = 0; j < 32; j = j + 1) begin
            gpr[j] = `OR1200_TOP.`CPU_cpu.`CPU_rf.rf_a.mem[gpr_no*32+j];
         end
 
`else
         //gpr = `OR1200_TOP.`CPU_cpu.`CPU_rf.rf_a.mem[gpr_no];
         gpr = `OR1200_TOP.`CPU_cpu.`CPU_rf.rf_a.get_gpr(gpr_no);
 
`endif
 
 
      end
   endtask
 
   //
   // Write state of the OR1200 registers into a file
   //
   // Limitation: only a small subset of register file RAMs
   // are supported
   //
   task display_arch_state;
      reg [5:0] i;
      reg [31:0] r;
      integer    j;
      begin
`ifdef OR1200_MONITOR_EXEC_STATE
         ref = ref + 1;
 `ifdef OR1200_MONITOR_LOOKUP
         $fdisplay(flookup, "Instruction %d: %t", insns, $time);
 `endif
         $fwrite(fexe, "\nEXECUTED(%d): %h:  %h", insns,
                 `OR1200_TOP.`CPU_cpu.`CPU_except.wb_pc,
                 `OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn);
 `ifdef OR1200_MONITOR_EXEC_LOG_DISASSEMBLY
         $fwrite(fexe,"\t");
         // Decode the instruction, print it out
         or1200_print_op(`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn);
 `endif
         for(i = 0; i < 32; i = i + 1) begin
            if (i % 4 == 0)
              $fdisplay(fexe);
            get_gpr(i, r);
            $fwrite(fexe, "GPR%d: %h  ", i, r);
         end
         $fdisplay(fexe);
         r = `OR1200_TOP.`CPU_cpu.`CPU_sprs.sr;
         $fwrite(fexe, "SR   : %h  ", r);
         r = `OR1200_TOP.`CPU_cpu.`CPU_sprs.epcr;
         $fwrite(fexe, "EPCR0: %h  ", r);
         r = `OR1200_TOP.`CPU_cpu.`CPU_sprs.eear;
         $fwrite(fexe, "EEAR0: %h  ", r);
         r = `OR1200_TOP.`CPU_cpu.`CPU_sprs.esr;
         $fdisplay(fexe, "ESR0 : %h", r);
`endif //  `ifdef OR1200_MONITOR_EXEC_STATE
`ifdef OR1200_DISPLAY_EXECUTED
         ref = ref + 1;
 `ifdef OR1200_MONITOR_LOOKUP
         $fdisplay(flookup, "Instruction %d: %t", insns, $time);
 `endif
         $fwrite(fexe, "\nEXECUTED(%d): %h:  %h", insns, `OR1200_TOP.`CPU_cpu.`CPU_except.wb_pc, `OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn);
`endif
         insns = insns + 1;
      end
   endtask // display_arch_state
 
   /* Keep a trace buffer of the last lot of instructions and addresses
    * "executed",as read from the writeback stage, and cause a $finish if we hit
    * an instruction that is invalid, such as all zeros.
    * Currently, only breaks on an all zero instruction, but should probably be
    * made to break for anything with an X in it too. And of course ideally this
    * shouldn't be needed - but is handy if someone changes something and stops
    * the test continuing forever.
    */
   integer num_nul_inst;
   initial num_nul_inst = 0;
 
   task monitor_for_crash;
`define OR1200_MONITOR_CRASH_TRACE_SIZE 32
      //Trace buffer of 32 instructions
      reg [31:0] insn_trace [0:`OR1200_MONITOR_CRASH_TRACE_SIZE-1];
      //Trace buffer of the addresses of those instructions
      reg [31:0] addr_trace [0:`OR1200_MONITOR_CRASH_TRACE_SIZE-1];
      integer    i;
 
      begin
         if (`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn == 32'h00000000)
           num_nul_inst = num_nul_inst + 1;
         else
           num_nul_inst = 0; // Reset it
 
         if (num_nul_inst == 1000) // Sat a loop a bit too long...
           begin
              $fdisplay(fgeneral, "ERROR - no instruction at PC %h",
                        `OR1200_TOP.`CPU_cpu.`CPU_except.wb_pc);
              $fdisplay(fgeneral, "Crash trace: Last %d instructions: ",
                        `OR1200_MONITOR_CRASH_TRACE_SIZE);
 
              $fdisplay(fgeneral, "PC\t\tINSTR");
              for(i=`OR1200_MONITOR_CRASH_TRACE_SIZE-1;i>=0;i=i-1) begin
                 $fdisplay(fgeneral, "%h\t%h",addr_trace[i], insn_trace[i]);
              end
              $display("*");
              $display("* or1200_monitor : OR1200 crash detected (suspected CPU PC corruption)");
              $display("*");
 
              #100 $finish;
           end
         else
           begin
              for(i=`OR1200_MONITOR_CRASH_TRACE_SIZE-1;i>0;i=i-1) begin
                 insn_trace[i] = insn_trace[i-1];
                 addr_trace[i] = addr_trace[i-1];
              end
              insn_trace[0] = `OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn;
              addr_trace[0] = `OR1200_TOP.`CPU_cpu.`CPU_except.wb_pc;
           end
 
      end
   endtask // monitor_for_crash
 
 
   //
   // Write state of the OR1200 registers into a file; version for exception
   //
   task display_arch_state_except;
      reg [5:0] i;
      reg [31:0] r;
      integer    j;
      begin
`ifdef OR1200_MONITOR_EXEC_STATE
         ref = ref + 1;
 `ifdef OR1200_MONITOR_LOOKUP
         $fdisplay(flookup, "Instruction %d: %t", insns, $time);
 `endif
         $fwrite(fexe, "\nEXECUTED(%d): %h:  %h  (exception)", insns, `OR1200_TOP.`CPU_cpu.`CPU_except.ex_pc, `OR1200_TOP.`CPU_cpu.`CPU_ctrl.ex_insn);
         for(i = 0; i < 32; i = i + 1) begin
            if (i % 4 == 0)
              $fdisplay(fexe);
            get_gpr(i, r);
            $fwrite(fexe, "GPR%d: %h  ", i, r);
         end
         $fdisplay(fexe);
         r = `OR1200_TOP.`CPU_cpu.`CPU_sprs.sr;
         $fwrite(fexe, "SR   : %h  ", r);
         r = `OR1200_TOP.`CPU_cpu.`CPU_sprs.epcr;
         $fwrite(fexe, "EPCR0: %h  ", r);
         r = `OR1200_TOP.`CPU_cpu.`CPU_sprs.eear;
         $fwrite(fexe, "EEAR0: %h  ", r);
         r = `OR1200_TOP.`CPU_cpu.`CPU_sprs.esr;
         $fdisplay(fexe, "ESR0 : %h", r);
         insns = insns + 1;
`endif //  `ifdef OR1200_MONITOR_EXEC_STATE
`ifdef OR1200_DISPLAY_EXECUTED
         ref = ref + 1;
 `ifdef OR1200_MONITOR_LOOKUP
         $fdisplay(flookup, "Instruction %d: %t", insns, $time);
 `endif
         $fwrite(fexe, "\nEXECUTED(%d): %h:  %h  (exception)", insns,
                 `OR1200_TOP.`CPU_cpu.`CPU_except.ex_pc,
                 `OR1200_TOP.`CPU_cpu.`CPU_ctrl.ex_insn);
         insns = insns + 1;
`endif
 
      end
   endtask
 
   integer iwb_progress;
   reg [31:0] iwb_progress_addr;
   //
   // WISHBONE bus checker
   //
   always @(posedge `OR1200_TOP.iwb_clk_i)
     if (`OR1200_TOP.iwb_rst_i) begin
        iwb_progress = 0;
        iwb_progress_addr = `OR1200_TOP.iwb_adr_o;
     end
     else begin
        if (`OR1200_TOP.iwb_cyc_o && (iwb_progress != 2)) begin
           iwb_progress = 1;
        end
        if (`OR1200_TOP.iwb_stb_o) begin
           if (iwb_progress >= 1) begin
              if (iwb_progress == 1)
                iwb_progress_addr = `OR1200_TOP.iwb_adr_o;
              iwb_progress = 2;
           end
           else begin
              $fdisplay(fgeneral, "WISHBONE protocol violation: `OR1200_TOP.iwb_stb_o raised without `OR1200_TOP.iwb_cyc_o, at %t\n", $time);
              #100 $finish;
           end
        end
        if (`OR1200_TOP.iwb_ack_i & `OR1200_TOP.iwb_err_i) begin
           $fdisplay(fgeneral, "WISHBONE protocol violation: `OR1200_TOP.iwb_ack_i and `OR1200_TOP.iwb_err_i raised at the same time, at %t\n", $time);
        end
        if ((iwb_progress == 2) && (iwb_progress_addr != `OR1200_TOP.iwb_adr_o)) begin
           $fdisplay(fgeneral, "WISHBONE protocol violation: `OR1200_TOP.iwb_adr_o changed while waiting for `OR1200_TOP.iwb_err_i/`OR1200_TOP.iwb_ack_i, at %t\n", $time);
           #100 $finish;
        end
        if (`OR1200_TOP.iwb_ack_i | `OR1200_TOP.iwb_err_i)
          if (iwb_progress == 2) begin
             iwb_progress = 0;
             iwb_progress_addr = `OR1200_TOP.iwb_adr_o;
          end
          else begin
             $fdisplay(fgeneral, "WISHBONE protocol violation: `OR1200_TOP.iwb_ack_i/`OR1200_TOP.iwb_err_i raised without `OR1200_TOP.iwb_cyc_i/`OR1200_TOP.iwb_stb_i, at %t\n", $time);
             #100 $finish;
          end
        if ((iwb_progress == 2) && !`OR1200_TOP.iwb_stb_o) begin
           $fdisplay(fgeneral, "WISHBONE protocol violation: `OR1200_TOP.iwb_stb_o lowered without `OR1200_TOP.iwb_err_i/`OR1200_TOP.iwb_ack_i, at %t\n", $time);
           #100 $finish;
        end
     end
 
   integer dwb_progress;
   reg [31:0] dwb_progress_addr;
   //
   // WISHBONE bus checker
   //
   always @(posedge `OR1200_TOP.dwb_clk_i)
     if (`OR1200_TOP.dwb_rst_i)
       dwb_progress = 0;
     else begin
        if (`OR1200_TOP.dwb_cyc_o && (dwb_progress != 2))
          dwb_progress = 1;
        if (`OR1200_TOP.dwb_stb_o)
          if (dwb_progress >= 1) begin
             if (dwb_progress == 1)
               dwb_progress_addr = `OR1200_TOP.dwb_adr_o;
             dwb_progress = 2;
          end
          else begin
             $fdisplay(fgeneral, "WISHBONE protocol violation: `OR1200_TOP.dwb_stb_o raised without `OR1200_TOP.dwb_cyc_o, at %t\n", $time);
             #100 $finish;
          end
        if (`OR1200_TOP.dwb_ack_i & `OR1200_TOP.dwb_err_i) begin
           $fdisplay(fgeneral, "WISHBONE protocol violation: `OR1200_TOP.dwb_ack_i and `OR1200_TOP.dwb_err_i raised at the same time, at %t\n", $time);
        end
        if ((dwb_progress == 2) && (dwb_progress_addr != `OR1200_TOP.dwb_adr_o)) begin
           $fdisplay(fgeneral, "WISHBONE protocol violation: `OR1200_TOP.dwb_adr_o changed while waiting for `OR1200_TOP.dwb_err_i/`OR1200_TOP.dwb_ack_i, at %t\n", $time);
           #100 $finish;
        end
        if (`OR1200_TOP.dwb_ack_i | `OR1200_TOP.dwb_err_i)
          if (dwb_progress == 2) begin
             dwb_progress = 0;
             dwb_progress_addr = `OR1200_TOP.dwb_adr_o;
          end
          else begin
             $fdisplay(fgeneral, "WISHBONE protocol violation: `OR1200_TOP.dwb_ack_i/`OR1200_TOP.dwb_err_i raised without `OR1200_TOP.dwb_cyc_i/`OR1200_TOP.dwb_stb_i, at %t\n", $time);
             #100 $finish;
          end
        if ((dwb_progress == 2) && !`OR1200_TOP.dwb_stb_o) begin
           $fdisplay(fgeneral, "WISHBONE protocol violation: `OR1200_TOP.dwb_stb_o lowered without `OR1200_TOP.dwb_err_i/`OR1200_TOP.dwb_ack_i, at %t\n", $time);
           #100 $finish;
        end
     end
 
   //
   // Hooks for:
   // - displaying registers
   // - end of simulation
   // - access to SPRs
   //
   always @(posedge `CPU_CORE_CLK)
     if (!`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_freeze) begin
        //      #2;
        if (((`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn[31:26] != `OR1200_OR32_NOP)
             | !`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn[16])
            & !(`OR1200_TOP.`CPU_cpu.`CPU_except.except_flushpipe &
                `OR1200_TOP.`CPU_cpu.`CPU_except.ex_dslot))
          begin
             display_arch_state;
             monitor_for_crash;
          end
        else
          if (`OR1200_TOP.`CPU_cpu.`CPU_except.except_flushpipe)
            display_arch_state_except;
        // small hack to stop simulation (l.nop 1):
        if (`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn == 32'h1500_0001) begin
           get_gpr(3, r3);
           $fdisplay(fgeneral, "%t: l.nop exit (%h)", $time, r3);
`ifdef OR1200_MONITOR_VERBOSE_NOPS
           $display("exit(%h)",r3);
`endif
           $finish;
        end
        // debug if test (l.nop 10)
        if (`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn == 32'h1500_000a) begin
           $fdisplay(fgeneral, "%t: l.nop dbg_if_test", $time);
        end
        // simulation reports (l.nop 2)
        if (`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn == 32'h1500_0002) begin
           get_gpr(3, r3);
           $fdisplay(fgeneral, "%t: l.nop report (0x%h)", $time, r3);
`ifdef OR1200_MONITOR_VERBOSE_NOPS
           $display("report (0x%h);", r3);
`endif
        end
        // simulation printfs (l.nop 3)
        if (`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn == 32'h1500_0003) begin
           get_gpr(3, r3);
           $fdisplay(fgeneral, "%t: l.nop printf (%h)", $time, r3);
        end
        if (`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn == 32'h1500_0004) begin
           // simulation putc (l.nop 4)
           get_gpr(3, r3);
           $write("%c", r3);
           $fdisplay(fgeneral, "%t: l.nop putc (%c)", $time, r3);
        end
`ifdef OR1200_MONITOR_SPRS
        if (`OR1200_TOP.`CPU_cpu.`CPU_sprs.spr_we)
          $fdisplay(fspr, "%t: Write to SPR : [%h] <- %h", $time,
                    `OR1200_TOP.`CPU_cpu.`CPU_sprs.spr_addr,
                    `OR1200_TOP.`CPU_cpu.`CPU_sprs.spr_dat_o);
        if ((|`OR1200_TOP.`CPU_cpu.`CPU_sprs.spr_cs) &
            !`OR1200_TOP.`CPU_cpu.`CPU_sprs.spr_we)
          $fdisplay(fspr, "%t: Read from SPR: [%h] -> %h", $time,
                    `OR1200_TOP.`CPU_cpu.`CPU_sprs.spr_addr,
                    `OR1200_TOP.`CPU_cpu.`CPU_sprs.to_wbmux);
`endif
     end
 
 
`ifdef RAM_WB
 `define RAM_WB_TOP `DUT_TOP.ram_wb0.ram_wb_b3_0
   task get_insn_from_wb_ram;
      input [31:0] addr;
      output [31:0] insn;
      begin
         insn = `RAM_WB_TOP.get_mem32(addr[31:2]);
      end
   endtask // get_insn_from_wb_ram
`endif
 
`ifdef VERSATILE_SDRAM
 `define SDRAM_TOP `TB_TOP.sdram0
   // Bit selects to define the bank
   // 32 MB part with 4 banks
 `define SDRAM_BANK_SEL_BITS 24:23
 `define SDRAM_WORD_SEL_TOP_BIT 22
   // Gets instruction word from correct bank
   task get_insn_from_sdram;
      input [31:0] addr;
      output [31:0] insn;
      reg [`SDRAM_WORD_SEL_TOP_BIT-1:0] word_addr;
 
      begin
         word_addr = addr[`SDRAM_WORD_SEL_TOP_BIT:2];
         if (addr[`SDRAM_BANK_SEL_BITS] == 2'b00)
           begin
 
              //$display("%t: get_insn_from_sdram bank0, word 0x%h, (%h and %h in SDRAM)", $time, word_addr, `SDRAM_TOP.Bank0[{word_addr,1'b0}], `SDRAM_TOP.Bank0[{word_addr,1'b1}]);         
              insn[15:0] = `SDRAM_TOP.Bank0[{word_addr,1'b1}];
              insn[31:16] = `SDRAM_TOP.Bank0[{word_addr,1'b0}];
           end
      end
 
   endtask // get_insn_from_sdram
`endif //  `ifdef VERSATILE_SDRAM
 
`ifdef XILINX_DDR2
   //SJK this needs to be fixed
//SJK  `define DDR2_TOP `TB_TOP.gen_cs[0]
   // Gets instruction word from correct bank
   task get_insn_from_xilinx_ddr2;
      input [31:0] addr;
      output [31:0] insn;
      reg [16*8-1:0] ddr2_array_line0,ddr2_array_line1,ddr2_array_line2,
                     ddr2_array_line3;
      integer        word_in_line_num;
      begin
         // Get our 4 128-bit chunks (8 half-words in each!! Confused yet?), 
         // 16 words total
/* SJK
         `DDR2_TOP.gen[0].u_mem0.memory_read(addr[28:27],addr[26:13],{addr[12:6],3'd0},ddr2_array_line0);
         `DDR2_TOP.gen[1].u_mem0.memory_read(addr[28:27],addr[26:13],{addr[12:6],3'd0},ddr2_array_line1);
         `DDR2_TOP.gen[2].u_mem0.memory_read(addr[28:27],addr[26:13],{addr[12:6],3'd0},ddr2_array_line2);
         `DDR2_TOP.gen[3].u_mem0.memory_read(addr[28:27],addr[26:13],{addr[12:6],3'd0},ddr2_array_line3);
*/
         u_mem0.memory_read(addr[28:27],addr[26:13],{addr[12:6],3'd0},ddr2_array_line0);
         insn[31:0] = ddr2_array_line0[31:0];
         $display("SJK DEBUG");
 
/*
         case (addr[5:2])
           4'h0:
             begin
                insn[15:0] = ddr2_array_line0[15:0];
                insn[31:16] = ddr2_array_line1[15:0];
             end
           4'h1:
             begin
                insn[15:0] = ddr2_array_line2[15:0];
                insn[31:16] = ddr2_array_line3[15:0];
             end
           4'h2:
             begin
                insn[15:0] = ddr2_array_line0[31:16];
                insn[31:16] = ddr2_array_line1[31:16];
             end
           4'h3:
             begin
                insn[15:0] = ddr2_array_line2[31:16];
                insn[31:16] = ddr2_array_line3[31:16];
             end
           4'h4:
             begin
                insn[15:0] = ddr2_array_line0[47:32];
                insn[31:16] = ddr2_array_line1[47:32];
             end
           4'h5:
             begin
                insn[15:0] = ddr2_array_line2[47:32];
                insn[31:16] = ddr2_array_line3[47:32];
             end
           4'h6:
             begin
                insn[15:0] = ddr2_array_line0[63:48];
                insn[31:16] = ddr2_array_line1[63:48];
             end
           4'h7:
             begin
                insn[15:0] = ddr2_array_line2[63:48];
                insn[31:16] = ddr2_array_line3[63:48];
             end
           4'h8:
             begin
                insn[15:0] = ddr2_array_line0[79:64];
                insn[31:16] = ddr2_array_line1[79:64];
             end
           4'h9:
             begin
                insn[15:0] = ddr2_array_line2[79:64];
                insn[31:16] = ddr2_array_line3[79:64];
             end
           4'ha:
             begin
                insn[15:0] = ddr2_array_line0[95:80];
                insn[31:16] = ddr2_array_line1[95:80];
             end
           4'hb:
             begin
                insn[15:0] = ddr2_array_line2[95:80];
                insn[31:16] = ddr2_array_line3[95:80];
             end
           4'hc:
             begin
                insn[15:0] = ddr2_array_line0[111:96];
                insn[31:16] = ddr2_array_line1[111:96];
             end
           4'hd:
             begin
                insn[15:0] = ddr2_array_line2[111:96];
                insn[31:16] = ddr2_array_line3[111:96];
             end
           4'he:
             begin
                insn[15:0] = ddr2_array_line0[127:112];
                insn[31:16] = ddr2_array_line1[127:112];
             end
           4'hf:
             begin
                insn[15:0] = ddr2_array_line2[127:112];
                insn[31:16] = ddr2_array_line3[127:112];
             end
         endcase // case (addr[5:2])
SJK */
      end
   endtask // get_insn_from_xilinx_ddr2
`endif
 
 
   task get_insn_from_memory;
      input [31:0] id_pc;
      output [31:0] insn;
      begin
         // do a decode of which server we should look in
         case (id_pc[31:28])
`ifdef VERSATILE_SDRAM
           4'h0:
             get_insn_from_sdram(id_pc, insn);
`endif
`ifdef XILINX_DDR2
           4'h0:
             get_insn_from_xilinx_ddr2(id_pc, insn);
`endif
`ifdef RAM_WB
           4'h0:
             get_insn_from_wb_ram(id_pc, insn);
`endif
           4'hf:
             // Flash isn't stored in a memory, it's an FSM so just skip/ignore
             insn = `OR1200_TOP.`CPU_cpu.`CPU_ctrl.id_insn;
           default:
             begin
                $fdisplay(fgeneral, "%t: Unknown memory server for address 0x%h", $time,id_pc);
                insn = 32'hxxxxxxxx; // Unknown server
             end
         endcase // case (id_pc[31:28])
      end
   endtask // get_insn_from_memory
 
 
   //
   // Look in the iMMU TLB MR for this address' page, if MMUs are on and enabled
   //
   task check_for_immu_entry;
      input [31:0] pc;
      output [31:0] physical_pc;
      output        mmu_tlb_miss;
      integer       w,x;
 
      reg [31:`OR1200_IMMU_PS] pc_vpn;
 
      reg [`OR1200_ITLBTRW-1:0] itlb_tr;
      reg [`OR1200_ITLBMRW-1:0] itlb_mr;
 
      integer                   tlb_index;
      reg                       mmu_en;
 
 
      begin
         mmu_tlb_miss = 0;
 
`ifdef OR1200_NO_IMMU
         physical_pc = pc;
`else
         mmu_en = `OR1200_TOP.`CPU_immu_top.immu_en;
         // If MMU is enabled
         if (mmu_en)
           begin
 
              // Look in the iTLB for mapping - get virtual page number
              pc_vpn = pc[31:`OR1200_IMMU_PS];
 
              tlb_index = pc[`OR1200_ITLB_INDX];
 
              // Look at the ITLB match register
              itlb_mr = `OR1200_TOP.`CPU_immu_top.`CPU_immu_tlb.itlb_mr_ram.mem[tlb_index];
 
              // Get the translate register here too, in case there's an error, we print it
              itlb_tr = `OR1200_TOP.`CPU_immu_top.`CPU_immu_tlb.itlb_tr_ram.mem[tlb_index];
 
              if ((itlb_mr[`OR1200_ITLBMR_V_BITS] === 1'b1) & (itlb_mr[`OR1200_ITLBMRW-1:1] === pc[`OR1200_ITLB_TAG]))
                begin
                   // Page number in match register matches page number of virtual PC, so get the physical
                   // address from the translate memory            
                   // Now pull the physical page number out of the tranlsate register (it's after bottom 3 bits)
                   physical_pc = {itlb_tr[`OR1200_ITLBTRW-1:`OR1200_ITLBTRW-(32-`OR1200_IMMU_PS)],pc[`OR1200_IMMU_PS-1:0]};
                   //$display("check_for_immu_entry: found match for virtual PC 0x%h in entry %d of iMMU, mr = 0x%x tr = 0x%x, phys. PC = 0x%h", pc, pc[`OR1200_ITLB_INDX], itlb_mr, itlb_tr, physical_pc);
                end // if ((itlb_mr[`OR1200_ITLBMR_V_BITS]) & (itlb_mr[`OR1200_ITLBMRW-1:1] == pc[`OR1200_ITLB_TAG]))
              else
                begin
 
                   // Wait a couple of clocks, see if we're doing a miss
                   @(posedge `CPU_CORE_CLK);
                   @(posedge `CPU_CORE_CLK);
                   if (!(`OR1200_TOP.`CPU_immu_top.miss)) // MMU should indicate miss
                     begin
                        $display("%t: check_for_immu_entry - ERROR - no match found for virtual PC 0x%h in entry %d of iMMU, mr = 0x%x tr = 0x%x, and no miss generated",
                                 $time, pc, pc[`OR1200_ITLB_INDX], itlb_mr, itlb_tr);
                        #100;
                        $finish;
                     end
                   else
                     begin
                        mmu_tlb_miss = 1; // Started a miss, so ignore this instruction
                     end
                end // else: !if((itlb_mr[`OR1200_ITLBMR_V_BITS]) & (itlb_mr[`OR1200_ITLBMRW-1:1] == pc[`OR1200_ITLB_TAG]))
 
           end // if (`OR1200_TOP.`CPU_immu_top.immu_en === 1'b1)
         else
           physical_pc = pc;
`endif // !`ifdef OR1200_NO_IMMU
      end
   endtask // check_for_immu_entry
 
 
   /*
    Instruction memory coherence checking.
 
    For new instruction executed in the pipeline - ensure it matches
    what is in the main program memory. Perform MMU translations if
    it is enabled.
    */
 
   reg [31:0] mem_word;
   reg [31:0] last_addr = 0;
   reg [31:0] last_mem_word;
   reg [31:0] physical_pc;
   reg        tlb_miss;
 
 
`ifdef MEM_COHERENCE_CHECK
 `define MEM_COHERENCE_TRIGGER (`OR1200_TOP.`CPU_cpu.`CPU_ctrl.id_void === 1'b0)
 
 `define INSN_TO_CHECK `OR1200_TOP.`CPU_cpu.`CPU_ctrl.id_insn
 `define PC_TO_CHECK `OR1200_TOP.`CPU_cpu.`CPU_except.id_pc
 
   // Check instruction in decode stage is what is in the RAM
   always @(posedge `CPU_CORE_CLK)
     begin
        if (`MEM_COHERENCE_TRIGGER)
          begin
 
             check_for_immu_entry(`PC_TO_CHECK, physical_pc, tlb_miss);
 
             // Check if it's a new PC - will also get triggered if the
             // instruction has changed since we last checked it
             if (((physical_pc !== last_addr) ||
                  (last_mem_word != `INSN_TO_CHECK)) & !tlb_miss)
               begin
                  // Decode stage not void, check instruction
                  // get PC
                  get_insn_from_memory(physical_pc, mem_word);
 
                  if (mem_word !== `INSN_TO_CHECK)
                    begin
                       $fdisplay(fgeneral, "%t: Instruction mismatch for PC 0x%h (phys. 0x%h) - memory had 0x%h, CPU had 0x%h",
                                 $time, `PC_TO_CHECK, physical_pc, mem_word,
                                 `INSN_TO_CHECK);
                       $display("%t: Instruction mismatch for PC 0x%h (phys. 0x%h) - memory had 0x%h, CPU had 0x%h",
                                $time, `PC_TO_CHECK, physical_pc, mem_word,
                                `INSN_TO_CHECK);
                       #200;
                       $finish;
                    end
                  last_addr = physical_pc;
                  last_mem_word = mem_word;
 
               end // if (((physical_pc !== last_addr) || (last_mem_word != `INSN_TO_CHECK))...      
          end // if (`MEM_COHERENCE_TRIGGER)    
     end // always @ (posedge `CPU_CORE_CLK)
 
`endif //  `ifdef MEM_COHERENCE_CHECK
 
   // Trigger on each instruction that gets into writeback stage properly
   reg exception_coming1, exception_coming2, exception_here;
   reg will_jump, jumping, jump_dslot, jumped;
   reg rfe, except_during_rfe;
   reg dslot_expt;
 
 
   // Maintain a copy of GPRS for previous instruction
   reg [31:0] current_gprs [0:31];
   reg [31:0] current_epcr, current_eear, current_esr, current_sr;
   reg [31:0] previous_gprs [0:31];
   reg [31:0] previous_epcr;
   reg [31:0] previous_eear;
   reg [31:0] previous_esr;
   reg [31:0] previous_sr;
 
   task update_current_gprs;
      integer j;
      begin
         for(j=0;j<32;j=j+1)
           begin
              get_gpr(j,current_gprs[j]);
           end
         current_sr = `OR1200_TOP.`CPU_cpu.`CPU_sprs.sr ;
         current_esr = `OR1200_TOP.`CPU_cpu.`CPU_sprs.epcr ;
         current_epcr = `OR1200_TOP.`CPU_cpu.`CPU_sprs.epcr ;
         current_eear = `OR1200_TOP.`CPU_cpu.`CPU_sprs.eear ;
      end
   endtask
 
   task update_previous_gprs;
      integer j;
      begin
         for(j=0;j<32;j=j+1)
           begin
              previous_gprs[j] = current_gprs[j];
           end
         previous_sr = current_sr;
         previous_esr = current_esr;
         previous_epcr = current_epcr;
         previous_eear = current_eear;
      end
   endtask // update_previous_gprs
 
   // Maintain a list of addresses we expect the processor to execute
   // Whenever we hit a branch or jump or rfe we add to this list - when we
   // execute it then we remove it from the list.
   reg [31:0] expected_addresses [0:31];
   reg        expected_addresses_waiting [0:31]; // List indicating if address is waiting
   reg        duplicate_expected_addresses_waiting [0:31]; // List indicating if a waiting address will be cleared by the single return
   integer    expected_address_num;
   // Initialise things on reset
   always @(`OR1200_TOP.iwb_rst_i)
     begin
        for (expected_address_num=0;expected_address_num<32;expected_address_num=expected_address_num+1)
          begin
             expected_addresses_waiting[expected_address_num] = 0;
             duplicate_expected_addresses_waiting[expected_address_num] = 0;
          end
        expected_address_num = 0;
     end
 
   task add_expected_address;
      input [31:0] expected_pc;
      begin
         if (expected_address_num == 31)
           begin
              $display("%t: Too many branches not reached",$time);
              #100;
              $finish;
           end
         if (expected_addresses_waiting[expected_address_num])
           begin
              $display("%t: expected_addresses tracker bugged out. expected_address_num = %0d",$time,expected_address_num);
              #100;
              $finish;
           end
         else
           begin
`ifdef OR1200_MONITOR_JUMPTRACK_DEBUG_OUTPUT
              // Debugging output...
              $display("%t: Adding address 0x%h to expected list index %0d",$time, expected_pc,expected_address_num);
`endif
              // Put the expected PC in the list, increase the index
              expected_addresses[expected_address_num] = expected_pc;
              expected_addresses_waiting[expected_address_num] = 1;
              expected_address_num = expected_address_num + 1;
           end // else: !if(expected_addresses_waiting[expected_address_num])
      end
   endtask // add_address_to_expect
 
   // Use this in the case that there's an execption after a jump, in which 
   // case we'll have two entries when we finally jump back (the one the 
   // original jump put in, and the one put in by the l.rfe or l.jr/ when 
   // returning outside of exception handler), so mark this one as OK for 
   // removing the duplicate of
   task mark_duplicate_expected_address;
      begin
         // This will always be done on the first instruction of an exception 
         // that has occured after a delay slot instruction, so 
         // expected_address_num will be one past the entry for the one we will
         // get a duplicate return call for
         duplicate_expected_addresses_waiting[expected_address_num-1] = 1;
      end
   endtask // mark_duplicate_expected_address
 
 
   task check_expected_address;
      input [31:0] pc;
      input        expecting_hit;
      integer      i,j;
      reg          hit;
      reg          duplicates;
 
      begin
         hit = 0;
         //$display("%t: check_expected_addr 0x%h, index %0d",
         // $time,pc, expected_address_num);     
         if (expected_address_num > 0)
           begin
              // First check the last jump we did
              if (expected_addresses[expected_address_num-1] == pc)
                begin
                   // Jump address hit
                   // Debugging printout:
`ifdef OR1200_MONITOR_JUMPTRACK_DEBUG_OUTPUT
                   $display("%t: PC address 0x%h was in expected list, index %0d",$time, pc,expected_address_num-1);
`endif
                   expected_address_num = expected_address_num-1;
                   expected_addresses_waiting[expected_address_num] = 0;
                   hit = 1;
                end
              else
                begin
                   // Check through the list
                   for(i=0;i<expected_address_num;i=i+1)
                     begin
                        if (expected_addresses[i] == pc)
                          begin
                             // Jump address hit
                             // Debugging printout:
`ifdef OR1200_MONITOR_JUMPTRACK_DEBUG_OUTPUT
                             $display("%t: PC address 0x%h was in expected list, index %0d",$time, pc,i);
`endif
                             for(j=i;j<expected_address_num;j=j+1)
                               begin
                                  // Pull all of the ones above us down one
                                  expected_addresses_waiting[j]
                                    = expected_addresses_waiting[j+1];
                                  expected_addresses[j]
                                    = expected_addresses[j+1];
                                  duplicate_expected_addresses_waiting[j]
                                    = duplicate_expected_addresses_waiting[j+1];
                               end
                             expected_address_num = expected_address_num-1;
                             hit = 1;
                             // quit out. only allow 1 hit
                             i = expected_address_num;
                          end
                     end
                end // else: !if(expected_addresses[expected_ad...
           end // if (expected_address_num > 0)
 
         // Check for duplicates this way because of the way we've declared
         // the array...
         duplicates=0;
         for(i=0;i<32;i=i+1)
           duplicates = duplicates | duplicate_expected_addresses_waiting[i];
 
         if (hit & duplicates)
           begin
              // If we got a hit, check for duplicates we're also meant to clear
`ifdef OR1200_MONITOR_JUMPTRACK_DEBUG_OUTPUT
              $display;
`endif
              for(i=0;i<expected_address_num;i=i+1)
                begin
                   if(duplicate_expected_addresses_waiting[i] &
                      expected_addresses_waiting[i] &
                      expected_addresses[i] == pc)
                     begin
                        // Found a duplicate call address, clear it
                        duplicate_expected_addresses_waiting[i] = 0;
                        expected_addresses_waiting[i] = 0;
 
                        // Now reorder the list - pull all the ones above us
                        // down by one
                        for(j=i;j<expected_address_num;j=j+1)
                          begin
                             expected_addresses_waiting[j] = expected_addresses_waiting[j+1];
                             expected_addresses[j] = expected_addresses[j+1];
                             duplicate_expected_addresses_waiting[j] = duplicate_expected_addresses_waiting[j+1];
                          end
                        expected_address_num = expected_address_num - 1;
                     end
                end // for (i=0;i<expected_address_num;i=i+1)
           end // if (hit & duplicates)
 
         if (expecting_hit & !hit)
           begin
              // Expected this address to be one we're supposed to jump to, but it wasn't!
              $display("%t: Failed to find current PC, 0x%h, in expected PCs for branches/jumps",$time,pc);
              #100;
              $finish;
           end
 
      end
   endtask // check_expected_address
 
   // Task to assert value of GPR
   task assert_gpr_val;
      input [5:0] regnum;
      input [31:0] assert_value;
      input [31:0] pc;
      reg [31:0]   reg_val;
 
      begin
         get_gpr(regnum, reg_val);
         if (reg_val !== assert_value)
           begin
              $display("%t: Assert r%0d value (0x%h) = 0x%h failed. pc=0x%h",
                       $time, regnum, reg_val, assert_value,pc);
              #100;
              $finish;
           end
      end
   endtask // assert_gpr_val
 
   // Task to assert something is true
   task assert_this;
      input assert_result;
      input [31:0] pc;
      begin
         if (!assert_result)
           begin
              $display("%t: Assert failed for instruction at pc=0x%h",
                       $time , pc);
              #100;
              $finish;
           end
      end
   endtask // assert_gpr_val             
 
   // The jumping variable doesn't get updated until we do the proper check of
   // the current instruction reaching the writeback stage. We need to know
   // earlier, eg. in the exception checking part, if this instruction will
   // jump. We do that with this task.
   task check_for_jump;
      input [31:0] insn;
      reg [5:0]    opcode;
      reg          flag;
      begin
         opcode = insn[`OR1K_OPCODE_POS];
         // Use the flag from the previous instruction, as the decision 
         // is made in the execute stage not in te writeback stage, 
         // which is where we're getting our instructions.
         flag = previous_sr[`OR1200_SR_F];
 
         case (opcode)
           `OR1200_OR32_J,
             `OR1200_OR32_JR,
             `OR1200_OR32_JAL,
             `OR1200_OR32_JALR:
               will_jump = 1;
           `OR1200_OR32_BNF:
             will_jump = !flag;
           `OR1200_OR32_BF:
             will_jump = flag;
           default:
             will_jump = 0;
         endcase // case (opcode)
      end
   endtask // check_for_jump   
 
 
 
   // Detect exceptions from the processor here
   reg [13:0] except_trig_r;
   reg        exception_coming;
 
   always @(posedge `CPU_CORE_CLK)
     if (`OR1200_TOP.iwb_rst_i)
       begin
          except_trig_r = 0;
          exception_coming = 0;
          except_during_rfe = 0;
       end
     else if ((|`OR1200_TOP.`CPU_cpu.`CPU_except.except_trig) && !exception_coming)
       begin
          exception_coming  = 1;
          except_trig_r = `OR1200_TOP.`CPU_cpu.`CPU_except.except_trig;
          except_during_rfe = rfe;
       end
 
   task check_incoming_exceptions;
      begin
 
         // Exception timing  - depends on the trigger.
         // Appears to be: 
         // tick timer - dslot - 1 instruction delay, else 2
         // tlb lookasides - 1 instruction for both
 
         casex (except_trig_r)
           13'b1_xxxx_xxxx_xxxx: begin
              //except_type <= #1 `OR1200_EXCEPT_TICK;
              exception_here = exception_coming2;
              exception_coming2 = jump_dslot ? exception_coming: exception_coming1 ;
              exception_coming1 = jump_dslot ? 0 : exception_coming;
           end
           13'b0_1xxx_xxxx_xxxx: begin
              //except_type <= #1 `OR1200_EXCEPT_INT;
              #1;
           end
           13'b0_01xx_xxxx_xxxx: begin
              //except_type <= #1 `OR1200_EXCEPT_ITLBMISS;
              exception_here = exception_coming2;
              exception_coming2 = jump_dslot ? exception_coming : exception_coming1 ;
              exception_coming1 = jump_dslot ? 0 : exception_coming;
           end
           13'b0_001x_xxxx_xxxx: begin
              //except_type <= #1 `OR1200_EXCEPT_IPF;
              exception_here = exception_coming2;
              exception_coming2 = jump_dslot ? exception_coming : exception_coming1 ;
              exception_coming1 = jump_dslot ? 0 : exception_coming;
           end
           13'b0_0001_xxxx_xxxx: begin
              //except_type <= #1 `OR1200_EXCEPT_BUSERR;
              exception_here = exception_coming;
              exception_coming2 = 0;
              exception_coming1 = 0;
           end
           13'b0_0000_1xxx_xxxx: begin
              //except_type <= #1 `OR1200_EXCEPT_ILLEGAL;
              if (will_jump)
                begin
                   // Writeback stage instruction will jump, and we have an
                   // illegal instruction in the decode/execute stage, which is
                   // the delay slot, so indicate the exception is coming...
                   exception_here = exception_coming2;
                   exception_coming2 = exception_coming;
                   exception_coming1 = 0;
                end
              else
                begin
                   exception_here = jump_dslot ?
                                    exception_coming2 : exception_coming;
                   exception_coming2 = jump_dslot ? exception_coming : 0;
                   exception_coming1 = 0;
                end
           end
           13'b0_0000_01xx_xxxx: begin
              //except_type <= #1 `OR1200_EXCEPT_ALIGN;
              if(will_jump)
                begin
                   exception_here = exception_coming2;
                   exception_coming2 = exception_coming;
                   exception_coming1 = 0;
                end
              else
                begin
                   exception_here =  (rfe) ? exception_coming : exception_coming2;
                   exception_coming2 = (rfe) ? 0 : exception_coming;
                   exception_coming1 = 0;
                end
           end
           13'b0_0000_001x_xxxx: begin
              //except_type <= #1 `OR1200_EXCEPT_DTLBMISS;
              // Looks like except_trig goes high here after we check the
              // instruction before the itlb miss after a delay slot, so we
              // miss the dslot variable (it gets propegated before we call
              // this task) so we use the jumped variable here to see if we
              // are an exception after a delay slot          
              //exception_here = (jumped | rfe) ? exception_coming : exception_coming2 ;
              //exception_coming2 = (jumped | rfe) ? 0 : exception_coming;
 
              exception_here = (jumped | rfe) ? exception_coming : exception_coming2 ;
              exception_coming2 = (jumped | rfe) ? 0 : exception_coming;
 
              exception_coming1 = 0;
           end
           13'b0_0000_0001_xxxx: begin
              //except_type <= #1 `OR1200_EXCEPT_DPF;
              if (jumped) begin // Jumped onto illegal instruction
                 exception_here = exception_coming ;
                 exception_coming2 = 0;
                 exception_coming1 = 0;
              end
              else begin
                 exception_here =  exception_coming2;
                 exception_coming2 = exception_coming;
                 exception_coming1 = 0;
              end
           end
           13'b0_0000_0000_1xxx: begin  // Data Bus Error
              //except_type <= #1 `OR1200_EXCEPT_BUSERR;
              exception_here = exception_coming2 ;
              exception_coming2 = exception_coming;
              exception_coming1 = 0;
           end
           13'b0_0000_0000_01xx: begin
              //except_type <= #1 `OR1200_EXCEPT_RANGE;
              #1;
           end
           13'b0_0000_0000_001x: begin
              // trap         
              #1;
           end
           13'b0_0000_0000_0001: begin
              //except_type <= #1 `OR1200_EXCEPT_SYSCALL;
              exception_here = exception_coming2;
              exception_coming2 = jumped ? exception_coming: exception_coming1 ;
              exception_coming1 = jumped ? 0 : exception_coming;
           end
         endcase // casex (except_trig_r)
 
         exception_coming = 0;
         except_during_rfe = 0;
 
      end
   endtask // check_incoming_exceptions
 
 
 
 
   /////////////////////////////////////////////////////////////////////////
   // Execution tracking task
   /////////////////////////////////////////////////////////////////////////
 
 
`ifdef OR1200_SYSTEM_CHECKER
   always @(posedge `CPU_CORE_CLK)
     begin
        if (`OR1200_TOP.iwb_rst_i)
          begin
             exception_coming1 = 0;exception_coming2 = 0;exception_here= 0;
             jumping = 0; jump_dslot = 0; jumped = 0;
             rfe = 0;
          end
        if (!`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_freeze) begin
           //#2 ;
           // If instruction isn't a l.nop with bit 16 set (implementation's 
           // filler instruction in pipeline), and do not have an exception 
           // signaled with a dslot instruction in the execute stage
           if (((`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn[`OR1K_OPCODE_POS] !=
                 `OR1200_OR32_NOP) || !`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn[16])
               && !(`OR1200_TOP.`CPU_cpu.`CPU_except.except_flushpipe &&
                    `OR1200_TOP.`CPU_cpu.`CPU_except.ex_dslot)) // and not except start
             begin
 
                // Propegate jump-tracking variables
                // If was exception in delay slot, we didn't actually jump
                // so don't set jumped in this case.
                jumped = exception_here ? 0 : jump_dslot;
                jump_dslot = jumping;
                jumping = 0;
                rfe = 0;
 
                // Now, check if current instruction will jump/branch, this is
                // needed by the exception checking code, sets will_jump=1
                check_for_jump(`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn);
 
                // Now check if it's an exception this instruction
                check_incoming_exceptions;
 
                // Case where we just went to an exception after a jump, so we 
                // mark the address we were meant to jump to as a place which will
                // have duplicate return entries in the expected address list
                if (exception_here & (jumped | jump_dslot))
                  begin
                     $display("%t: marked as jump address with exception (dup)"
                              ,$time);
                     mark_duplicate_expected_address;
                  end
 
                or1200_check_execution(`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn,
                                       `OR1200_TOP.`CPU_cpu.`CPU_except.wb_pc,
                                       exception_here);
                //$write("%t: pc:0x%h\t",$time,
                //       `OR1200_TOP.`CPU_cpu.`CPU_except.wb_pc);
                // Decode the instruction, print it out
                //or1200_print_op(`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_insn); 
                //$write("\t exc:%0h dsl:%0h\n",exception_here,jump_dslot);
 
 
 
             end
        end // if (!`OR1200_TOP.`CPU_cpu.`CPU_ctrl.wb_freeze)
     end // always @ (posedge `CPU_CORE_CLK)
`endif
 
 
   task or1200_check_execution;
      input [31:0] insn;
      input [31:0] pc;
      input        exception;
 
      reg [5:0]    opcode;
 
      reg [25:0]   j_imm;
      reg [25:0]   br_imm;
 
      reg [4:0]    rD_num, rA_num, rB_num;
      reg [31:0]   rD_val, rA_val, rB_val;
      reg [15:0]   imm_16bit;
 
      reg [15:0]   mtspr_imm;
 
      reg [3:0]    alu_op;
      reg [1:0]    shrot_op;
 
      reg [5:0]    shroti_imm;
 
      reg [5:0]    sf_op;
 
      reg [5:0]    xsync_op;
 
      reg          flag;
 
      reg [31:0]   br_j_ea; // Branch/jump effective address
 
 
      begin
 
         // Instruction opcode
         opcode = insn[`OR1K_OPCODE_POS];
         // Immediates for jump or branch instructions
         j_imm = insn[`OR1K_J_BR_IMM_POS];
         br_imm = insn[`OR1K_J_BR_IMM_POS];
         // Register numbers (D, A and B)
         rD_num = insn[`OR1K_RD_POS];
         rA_num = insn[`OR1K_RA_POS];
         rB_num = insn[`OR1K_RB_POS];
         // Bottom 16 bits when used as immediates in various instructions
         imm_16bit = insn[15:0];
         // 16-bit immediate for mtspr instructions
         mtspr_imm = {insn[25:21],insn[10:0]};
         // ALU op for ALU instructions
         alu_op = insn[`OR1K_ALU_OP_POS];
         // Shift-rotate op for SHROT ALU instructions
         shrot_op = insn[`OR1K_SHROT_OP_POS];
         shroti_imm = insn[`OR1K_SHROTI_IMM_POS];
 
         // Set flag op
         sf_op = insn[`OR1K_SF_OP];
 
         // Xsync/syscall/trap opcode
         xsync_op = insn[`OR1K_XSYNC_OP_POS];
 
         // Use the flag from the previous instruction, as the decision 
         // is made in the execute stage not in te writeback stage, 
         // which is where we're getting our instructions.
         flag = previous_sr[`OR1200_SR_F];
 
         update_current_gprs;
 
         // Check MSbit of the immediate, sign extend if set
         br_j_ea = j_imm[25] ? pc + {4'hf,j_imm,2'b00} :
                   pc + {4'h0,j_imm,2'b00};
 
         if (exception)
           begin
              $display("%t: exception - at 0x%x",$time, pc);
              // get epcr, put it in the addresses we expect to jump
              // back to
              // Maybe DON'T do this. Because maybe in linux things we 
              // interrupt out of, we don't want to execute them again?
              //add_expected_address(current_epcr);
           end
 
 
         check_expected_address(pc, (jumped & !exception));
 
         rfe = 0;
 
         case (opcode)
           `OR1200_OR32_J:
             begin
                //
                // PC < - exts(Immediate < < 2) + JumpInsnAddr
                //
                //The immediate value is shifted left two bits, sign-extended 
                // to program counter width, and then added to the address of 
                // the jump instruction. The result is the effective address 
                // of the jump. The program unconditionally jumps to EA with 
                // a delay of one instruction.
 
                add_expected_address(br_j_ea);
 
                jumping = 1;
             end
           `OR1200_OR32_JAL:
             begin
                //
                //PC < - exts(Immediate < < 2) + JumpInsnAddr
                //LR < - DelayInsnAddr + 4
                //
                // Link reg is r9, check it is PC+8
                //
                add_expected_address(br_j_ea);
                assert_gpr_val(9, pc+8, pc);
                jumping = 1;    // 
             end
           `OR1200_OR32_BNF:
             begin
                //EA < - exts(Immediate < < 2) + BranchInsnAddr
                //PC < - EA if SR[F] cleared
                if (!flag)
                  begin
                     add_expected_address(br_j_ea);
                     jumping = 1;
                  end
             end
           `OR1200_OR32_BF:
             begin
                //EA < - exts(Immediate < < 2) + BranchInsnAddr
                //PC < - EA if SR[F] set
                if (flag)
                  begin
                     add_expected_address(br_j_ea);
                     jumping = 1;
                  end
             end
           `OR1200_OR32_RFE:
             begin
                add_expected_address(current_epcr);
                // jumping variable keeps track of jumps/branches with delay 
                // slot - there is none for l.rfe
                rfe = 1;
             end
           `OR1200_OR32_JR:
             begin
                //PC < - rB
                get_gpr(rB_num, rB_val);
                add_expected_address(rB_val);
                jumping = 1;
             end
           `OR1200_OR32_JALR:
             begin
                //PC < - rB
                //LR < - DelayInsnAddr + 4
                get_gpr(rB_num, rB_val);
                add_expected_address(rB_val);
                assert_gpr_val(9, pc+8, pc);
                jumping = 1;
             end
           /*
            `OR1200_OR32_LWZ,
            `OR1200_OR32_LBZ,
            `OR1200_OR32_LBS,
            `OR1200_OR32_LHZ,
            `OR1200_OR32_LHS,
            `OR1200_OR32_SW,
            `OR1200_OR32_SB,
            `OR1200_OR32_SH:
            begin
            // Should result in databus access if data cache disabled
            $display("%t: lsu instruction",$time);
end
 
            `OR1200_OR32_MFSPR,
            `OR1200_OR32_MTSPR:
            begin
            // Confirm RF values end up in the correct SPR
            $display("%t: mxspr",$time);
end
 
            `OR1200_OR32_MOVHI,
            `OR1200_OR32_ADDI,
            `OR1200_OR32_ADDIC,
            `OR1200_OR32_ANDI,
            `OR1200_OR32_ORI,
            `OR1200_OR32_XORI,
            `OR1200_OR32_MULI,
            `OR1200_OR32_ALU:
            begin
            // Double check operations done on RF and immediate values
            $display("%t: ALU op",$time);
end
 
            `OR1200_OR32_SH_ROTI:
            begin
            // Rotate according to immediate - maybe should be in ALU ops
            $display("%t: rotate op",$time);
end
 
            `OR1200_OR32_SFXXI,
            `OR1200_OR32_SFXX:
            begin
            // Set flag - do the check oursevles, check flag
            $display("%t: set flag op",$time);
end
 
            `OR1200_OR32_MACI,
            `OR1200_OR32_MACMSB:
            begin
            // Either, multiply signed and accumulate, l.mac
            // or multiply signed and subtract, l.msb
            $display("%t: MAC op",$time);
end
            */
 
           /*default:
            begin
            $display("%t: Unknown opcode 0x%h at pc 0x%x\n",
            $time,opcode, pc);
end
            */
         endcase // case (opcode)
 
         update_previous_gprs;
 
      end
   endtask // or1200_check_execution
 
 
   /////////////////////////////////////////////////////////////////////////
   // Instruction decode task
   /////////////////////////////////////////////////////////////////////////
 
   task or1200_print_op;
      input [31:0] insn;
 
      reg [5:0]    opcode;
 
      reg [25:0]   j_imm;
      reg [25:0]   br_imm;
 
      reg [4:0]    rD_num, rA_num, rB_num;
      reg [31:0]   rA_val, rB_val;
      reg [15:0]   imm_16bit;
      reg [10:0]   imm_split16bit;
 
      reg [3:0]    alu_op;
      reg [1:0]    shrot_op;
 
      reg [5:0]    shroti_imm;
 
      reg [5:0]    sf_op;
 
      reg [5:0]    xsync_op;
 
      begin
         // Instruction opcode
         opcode = insn[`OR1K_OPCODE_POS];
         // Immediates for jump or branch instructions
         j_imm = insn[`OR1K_J_BR_IMM_POS];
         br_imm = insn[`OR1K_J_BR_IMM_POS];
         // Register numbers (D, A and B)
         rD_num = insn[`OR1K_RD_POS];
         rA_num = insn[`OR1K_RA_POS];
         rB_num = insn[`OR1K_RB_POS];
         // Bottom 16 bits when used as immediates in various instructions
         imm_16bit = insn[15:0];
         // Bottom 11 bits used as immediates for l.sX instructions
 
         // Split 16-bit immediate for l.mtspr/l.sX instructions
         imm_split16bit = {insn[25:21],insn[10:0]};
         // ALU op for ALU instructions
         alu_op = insn[`OR1K_ALU_OP_POS];
         // Shift-rotate op for SHROT ALU instructions
         shrot_op = insn[`OR1K_SHROT_OP_POS];
         shroti_imm = insn[`OR1K_SHROTI_IMM_POS];
 
         // Set flag op
         sf_op = insn[`OR1K_SF_OP];
 
         // Xsync/syscall/trap opcode
         xsync_op = insn[`OR1K_XSYNC_OP_POS];
 
         case (opcode)
           `OR1200_OR32_J:
             begin
                $fwrite(finsn,"l.j 0x%h", {j_imm,2'b00});
             end
 
           `OR1200_OR32_JAL:
             begin
                $fwrite(finsn,"l.jal 0x%h", {j_imm,2'b00});
             end
 
           `OR1200_OR32_BNF:
             begin
                $fwrite(finsn,"l.bnf 0x%h", {br_imm,2'b00});
             end
 
           `OR1200_OR32_BF:
             begin
                $fwrite(finsn,"l.bf 0x%h", {br_imm,2'b00});
             end
 
           `OR1200_OR32_RFE:
             begin
                $fwrite(finsn,"l.rfe");
             end
 
           `OR1200_OR32_JR:
             begin
                $fwrite(finsn,"l.jr r%0d",rB_num);
             end
 
           `OR1200_OR32_JALR:
             begin
                $fwrite(finsn,"l.jalr r%0d",rB_num);
             end
 
           `OR1200_OR32_LWZ:
             begin
                $fwrite(finsn,"l.lwz r%0d,0x%0h(r%0d)",rD_num,imm_16bit,rA_num);
             end
 
           `OR1200_OR32_LBZ:
             begin
                $fwrite(finsn,"l.lbz r%0d,0x%0h(r%0d)",rD_num,imm_16bit,rA_num);
             end
 
           `OR1200_OR32_LBS:
             begin
                $fwrite(finsn,"l.lbs r%0d,0x%0h(r%0d)",rD_num,imm_16bit,rA_num);
             end
 
           `OR1200_OR32_LHZ:
             begin
                $fwrite(finsn,"l.lhz r%0d,0x%0h(r%0d)",rD_num,imm_16bit,rA_num);
             end
 
           `OR1200_OR32_LHS:
             begin
                $fwrite(finsn,"l.lhs r%0d,0x%0h(r%0d)",rD_num,imm_16bit,rA_num);
             end
 
           `OR1200_OR32_SW:
             begin
                $fwrite(finsn,"l.sw 0x%0h(r%0d),r%0d",imm_split16bit,rA_num,rB_num);
             end
 
           `OR1200_OR32_SB:
             begin
                $fwrite(finsn,"l.sb 0x%0h(r%0d),r%0d",imm_split16bit,rA_num,rB_num);
             end
 
           `OR1200_OR32_SH:
             begin
                $fwrite(finsn,"l.sh 0x%0h(r%0d),r%0d",imm_split16bit,rA_num,rB_num);
             end
 
           `OR1200_OR32_MFSPR:
             begin
                $fwrite(finsn,"l.mfspr r%0d,r%0d,0x%h",rD_num,rA_num,imm_16bit,);
             end
 
           `OR1200_OR32_MTSPR:
             begin
                $fwrite(finsn,"l.mtspr r%0d,r%0d,0x%h",rA_num,rB_num,imm_split16bit);
             end
 
           `OR1200_OR32_MOVHI:
             begin
                if (!insn[16])
                  $fwrite(finsn,"l.movhi r%0d,0x%h",rD_num,imm_16bit);
                else
                  $fwrite(finsn,"l.macrc r%0d",rD_num);
             end
 
           `OR1200_OR32_ADDI:
             begin
                $fwrite(finsn,"l.addi r%0d,r%0d,0x%h",rD_num,rA_num,imm_16bit);
             end
 
           `OR1200_OR32_ADDIC:
             begin
                $fwrite(finsn,"l.addic r%0d,r%0d,0x%h",rD_num,rA_num,imm_16bit);
             end
 
           `OR1200_OR32_ANDI:
             begin
                $fwrite(finsn,"l.andi r%0d,r%0d,0x%h",rD_num,rA_num,imm_16bit);
             end
 
           `OR1200_OR32_ORI:
             begin
                $fwrite(finsn,"l.ori r%0d,r%0d,0x%h",rD_num,rA_num,imm_16bit);
             end
 
           `OR1200_OR32_XORI:
             begin
                $fwrite(finsn,"l.xori r%0d,r%0d,0x%h",rD_num,rA_num,imm_16bit);
             end
 
           `OR1200_OR32_MULI:
             begin
                $fwrite(finsn,"l.muli r%0d,r%0d,0x%h",rD_num,rA_num,imm_16bit);
             end
 
           `OR1200_OR32_ALU:
             begin
                case(alu_op)
                  `OR1200_ALUOP_ADD:
                    $fwrite(finsn,"l.add ");
                  `OR1200_ALUOP_ADDC:
                    $fwrite(finsn,"l.addc ");
                  `OR1200_ALUOP_SUB:
                    $fwrite(finsn,"l.sub ");
                  `OR1200_ALUOP_AND:
                    $fwrite(finsn,"l.and ");
                  `OR1200_ALUOP_OR:
                    $fwrite(finsn,"l.or ");
                  `OR1200_ALUOP_XOR:
                    $fwrite(finsn,"l.xor ");
                  `OR1200_ALUOP_MUL:
                    $fwrite(finsn,"l.mul ");
                  `OR1200_ALUOP_SHROT:
                    begin
                       case(shrot_op)
                         `OR1200_SHROTOP_SLL:
                           $fwrite(finsn,"l.sll ");
                         `OR1200_SHROTOP_SRL:
                           $fwrite(finsn,"l.srl ");
                         `OR1200_SHROTOP_SRA:
                           $fwrite(finsn,"l.sra ");
                         `OR1200_SHROTOP_ROR:
                           $fwrite(finsn,"l.ror ");
                       endcase // case (shrot_op)
                    end
                  `OR1200_ALUOP_DIV:
                    $fwrite(finsn,"l.div ");
                  `OR1200_ALUOP_DIVU:
                    $fwrite(finsn,"l.divu ");
                  `OR1200_ALUOP_CMOV:
                    $fwrite(finsn,"l.cmov ");
                endcase // case (alu_op)
                $fwrite(finsn,"r%0d,r%0d,r%0d",rD_num,rA_num,rB_num);
             end
 
           `OR1200_OR32_SH_ROTI:
             begin
                case(shrot_op)
                  `OR1200_SHROTOP_SLL:
                    $fwrite(finsn,"l.slli ");
                  `OR1200_SHROTOP_SRL:
                    $fwrite(finsn,"l.srli ");
                  `OR1200_SHROTOP_SRA:
                    $fwrite(finsn,"l.srai ");
                  `OR1200_SHROTOP_ROR:
                    $fwrite(finsn,"l.rori ");
                endcase // case (shrot_op)
                $fwrite(finsn,"r%0d,r%0d,0x%h",rD_num,rA_num,shroti_imm);
             end
 
           `OR1200_OR32_SFXXI:
             begin
                case(sf_op[2:0])
                  `OR1200_COP_SFEQ:
                    $fwrite(finsn,"l.sfeqi ");
                  `OR1200_COP_SFNE:
                    $fwrite(finsn,"l.sfnei ");
                  `OR1200_COP_SFGT:
                    begin
                       if (sf_op[`OR1200_SIGNED_COMPARE])
                         $fwrite(finsn,"l.sfgtsi ");
                       else
                         $fwrite(finsn,"l.sfgtui ");
                    end
                  `OR1200_COP_SFGE:
                    begin
                       if (sf_op[`OR1200_SIGNED_COMPARE])
                         $fwrite(finsn,"l.sfgesi ");
                       else
                         $fwrite(finsn,"l.sfgeui ");
                    end
                  `OR1200_COP_SFLT:
                    begin
                       if (sf_op[`OR1200_SIGNED_COMPARE])
                         $fwrite(finsn,"l.sfltsi ");
                       else
                         $fwrite(finsn,"l.sfltui ");
                    end
                  `OR1200_COP_SFLE:
                    begin
                       if (sf_op[`OR1200_SIGNED_COMPARE])
                         $fwrite(finsn,"l.sflesi ");
                       else
                         $fwrite(finsn,"l.sfleui ");
                    end
                endcase // case (sf_op[2:0])
 
                $fwrite(finsn,"r%0d,0x%h",rA_num, imm_16bit);
 
             end // case: `OR1200_OR32_SFXXI
 
           `OR1200_OR32_SFXX:
             begin
                case(sf_op[2:0])
                  `OR1200_COP_SFEQ:
                    $fwrite(finsn,"l.sfeq ");
                  `OR1200_COP_SFNE:
                    $fwrite(finsn,"l.sfne ");
                  `OR1200_COP_SFGT:
                    begin
                       if (sf_op[`OR1200_SIGNED_COMPARE])
                         $fwrite(finsn,"l.sfgts ");
                       else
                         $fwrite(finsn,"l.sfgtu ");
                    end
                  `OR1200_COP_SFGE:
                    begin
                       if (sf_op[`OR1200_SIGNED_COMPARE])
                         $fwrite(finsn,"l.sfges ");
                       else
                         $fwrite(finsn,"l.sfgeu ");
                    end
                  `OR1200_COP_SFLT:
                    begin
                       if (sf_op[`OR1200_SIGNED_COMPARE])
                         $fwrite(finsn,"l.sflts ");
                       else
                         $fwrite(finsn,"l.sfltu ");
                    end
                  `OR1200_COP_SFLE:
                    begin
                       if (sf_op[`OR1200_SIGNED_COMPARE])
                         $fwrite(finsn,"l.sfles ");
                       else
                         $fwrite(finsn,"l.sfleu ");
                    end
 
                endcase // case (sf_op[2:0])
 
                $fwrite(finsn,"r%0d,r%0d",rA_num, rB_num);
 
             end
 
           `OR1200_OR32_MACI:
             begin
                $fwrite(finsn,"l.maci r%0d,0x%h",rA_num,imm_16bit);
             end
 
           `OR1200_OR32_MACMSB:
             begin
                if(insn[3:0] == 4'h1)
                  $fwrite(finsn,"l.mac ");
                else if(insn[3:0] == 4'h2)
                  $fwrite(finsn,"l.msb ");
 
                $fwrite(finsn,"r%0d,r%0d",rA_num,rB_num);
             end
 
           `OR1200_OR32_NOP:
             begin
                $fwrite(finsn,"l.nop 0x%0h",imm_16bit);
             end
 
           `OR1200_OR32_XSYNC:
             begin
                case (xsync_op)
                  5'd0:
                    $fwrite(finsn,"l.sys 0x%h",imm_16bit);
                  5'd8:
                    $fwrite(finsn,"l.trap 0x%h",imm_16bit);
                  5'd16:
                    $fwrite(finsn,"l.msync");
                  5'd20:
                    $fwrite(finsn,"l.psync");
                  5'd24:
                    $fwrite(finsn,"l.csync");
                  default:
                    begin
                       $display("%t: Instruction with opcode 0x%h has bad specific type information: 0x%h",$time,opcode,insn);
                       $fwrite(finsn,"%t: Instruction with opcode 0x%h has has bad specific type information: 0x%h",$time,opcode,insn);
                    end
                endcase // case (xsync_op)
             end
 
           default:
             begin
                $display("%t: Unknown opcode 0x%h",$time,opcode);
                $fwrite(finsn,"%t: Unknown opcode 0x%h",$time,opcode);
             end
 
         endcase // case (opcode)
 
      end
   endtask // or1200_print_op
 
 
 
endmodule
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[/] [openrisc/] [trunk/] [orpsocv2/] [boards/] [xilinx/] [atlys/] [bench/] [verilog/] [or1200_monitor.v] - Blame information for rev 631

Line No.	Rev	Author	Line
1	631	stekern	`//////////////////////////////////////////////////////////////////////`
2			`//// ////`
3			`//// or1200_monitor.v ////`
4			`//// ////`
5			`//// OR1200 processor monitor module ////`
6			`//// ////`
7			`//// Author(s): ////`
8			`//// - Damjan Lampret, lampret@opencores.org ////`
9			`//// - Julius Baxter, julius@opencores.org ////`
10			`//// ////`
11			`//////////////////////////////////////////////////////////////////////`
12			`//// ////`
13			`//// Copyright (C) 2009, 2010 Authors and OPENCORES.ORG ////`
14			`//// ////`
15			`//// This source file may be used and distributed without ////`
16			`//// restriction provided that this copyright statement is not ////`
17			`//// removed from the file and that any derivative work contains ////`
18			`//// the original copyright notice and the associated disclaimer. ////`
19			`//// ////`
20			`//// This source file is free software; you can redistribute it ////`
21			`//// and/or modify it under the terms of the GNU Lesser General ////`
22			`//// Public License as published by the Free Software Foundation; ////`
23			`//// either version 2.1 of the License, or (at your option) any ////`
24			`//// later version. ////`
25			`//// ////`
26			`//// This source is distributed in the hope that it will be ////`
27			`//// useful, but WITHOUT ANY WARRANTY; without even the implied ////`
28			`//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////`
29			`//// PURPOSE. See the GNU Lesser General Public License for more ////`
30			`//// details. ////`
31			`//// ////`
32			`//// You should have received a copy of the GNU Lesser General ////`
33			`//// Public License along with this source; if not, download it ////`
34			`//// from http://www.opencores.org/lgpl.shtml ////`
35			`//// ////`
36			`//////////////////////////////////////////////////////////////////////`
37
38			`include "timescale.v"
39			`include "or1200_defines.v"
40			`include "or1200_monitor_defines.v"