Decode: Fix stupid bug in which stalls did not stall the decoder.
[firearm.git] / RegFile.v
index 47f5024..730a620 100644 (file)
--- a/RegFile.v
+++ b/RegFile.v
@@ -1,13 +1,16 @@
 module RegFile(
        input clk,
+       input [3:0] read_0,
+       output reg [31:0] rdata_0,
        input [3:0] read_1,
        output reg [31:0] rdata_1,
        input [3:0] read_2,
        output reg [31:0] rdata_2,
        input [3:0] read_3,
        output reg [31:0] rdata_3,
-       input [3:0] write,
-       input write_req,
+       output reg [31:0] spsr,
+       input write,
+       input [3:0] write_reg,
        input [31:0] write_data
        );
        
@@ -22,35 +25,42 @@ module RegFile(
                regfile[4'h5] = 32'h00500000;
                regfile[4'h6] = 32'h05000000;
                regfile[4'h7] = 32'h50000000;
-               regfile[4'h8] = 32'h0000000A;
-               regfile[4'h9] = 32'h000000A0;
-               regfile[4'hA] = 32'h00000A00;
-               regfile[4'hB] = 32'h0000A000;
-               regfile[4'hC] = 32'h000A0000;
-               regfile[4'hD] = 32'h00A00000;
-               regfile[4'hE] = 32'h0A000000;
-               regfile[4'hF] = 32'hA0000000;
+               regfile[4'h8] = 32'hA0000000;
+               regfile[4'h9] = 32'h0A000000;
+               regfile[4'hA] = 32'h00A00000;
+               regfile[4'hB] = 32'h000A0000;
+               regfile[4'hC] = 32'h0000A000;
+               regfile[4'hD] = 32'h00000A00;
+               regfile[4'hE] = 32'h000000A0;
+               regfile[4'hF] = 32'h00000000;   /* Start off claiming we are in user mode. */
        end
        
        always @(*)
        begin
-               if ((read_1 == write) && write_req)
+               if ((read_0 == write_reg) && write)
+                       rdata_0 = write_data;
+               else
+                       rdata_0 = regfile[read_0];
+               
+               if ((read_1 == write_reg) && write)
                        rdata_1 = write_data;
                else
                        rdata_1 = regfile[read_1];
                
-               if ((read_2 == write) && write_req)
+               if ((read_2 == write_reg) && write)
                        rdata_2 = write_data;
                else
                        rdata_2 = regfile[read_2];
-               
-               if ((read_3 == write) && write_req)
+
+               if ((read_3 == write_reg) && write)
                        rdata_3 = write_data;
                else
                        rdata_3 = regfile[read_3];
+               
+               spsr = regfile[4'hF];
        end
        
        always @(posedge clk)
-               if (write_req)
-                       regfile[write] <= write_data;
+               if (write)
+                       regfile[write_reg] <= write_data;
 endmodule
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