Merge pull request #48 from ross144/main

Fixed bug #47, ecall and ebreak don't commit

pipelined/src/hazard/hazard.sv

@@ -68,7 +68,7 @@ module hazard (
   assign FlushDCause = TrapM | RetM | CSRWriteFenceM | BPPredWrongE;
   assign FlushECause = TrapM | RetM | CSRWriteFenceM |(BPPredWrongE & ~(DivBusyE | FDivBusyE));
   assign FlushMCause = TrapM | RetM | CSRWriteFenceM;
-  assign FlushWCause = TrapM & ~(BreakpointFaultM | EcallFaultM);
+  assign FlushWCause = TrapM;
 
   // Stall causes
   //  Most data depenency stalls are identified in the decode stage

pipelined/src/ifu/bpred/bpred.sv

@@ -116,7 +116,7 @@ module bpred (
 
   end else if (`BPRED_TYPE == "BPSPECULATIVEGSHARE") begin:Predictor
     speculativegshare #(`BPRED_SIZE) DirPredictor(.clk, .reset, .StallF, .StallD, .StallE, .StallM, .StallW, .FlushD, .FlushE, .FlushM, .FlushW,
-      .PCNextF, .PCF, .PCD, .PCE, .PCM, .DirPredictionF, .DirPredictionWrongE,
+      .PCNextF, .PCF, .PCD, .PCE, .DirPredictionF, .DirPredictionWrongE,
       .PredInstrClassF, .InstrClassD, .InstrClassE, .WrongPredInstrClassD, .PCSrcE);
 
   end else if (`BPRED_TYPE == "BPLOCALPAg") begin:Predictor
@@ -149,6 +149,7 @@ module bpred (
           .PredValidF,
           .PredictionInstrClassWrongE,
           .IEUAdrE,
+          .InstrClassD,
           .InstrClassE);
 
   // the branch predictor needs a compact decoding of the instruction class.
@@ -179,12 +180,14 @@ module bpred (
 	assign PredInstrClassF = InstrClassF;
 	assign SelBPPredF = (PredInstrClassF[0] & DirPredictionF[1]) | 
 						PredInstrClassF[2] |
-						(PredInstrClassF[1]) ;
+						PredInstrClassF[1] |
+						PredInstrClassF[3];
   end else begin
 	assign PredInstrClassF = BTBPredInstrClassF;
 	assign SelBPPredF = (PredInstrClassF[0] & DirPredictionF[1] & PredValidF) | 
 						PredInstrClassF[2] |
-						(PredInstrClassF[1] & PredValidF) ;
+						(PredInstrClassF[1] & PredValidF) |
+						(PredInstrClassF[3] & PredValidF);
   end
   
   // Part 3 RAS

pipelined/src/ifu/bpred/btb.sv

@@ -41,6 +41,7 @@ module btb #(parameter int Depth = 10 ) (
   // update
   input  logic             PredictionInstrClassWrongE,             // BTB's instruction class guess was wrong
   input  logic [`XLEN-1:0] IEUAdrE,                                // Branch/jump target address to insert into btb
+  input  logic [3:0]       InstrClassD,                            // Instruction class to insert into btb
   input  logic [3:0]       InstrClassE                             // Instruction class to insert into btb
 );
 
@@ -49,12 +50,12 @@ module btb #(parameter int Depth = 10 ) (
   logic [Depth-1:0]         PCNextFIndex, PCFIndex, PCDIndex, PCEIndex;
   logic [`XLEN-1:0] 		ResetPC;
   logic 					MatchF, MatchD, MatchE, MatchNextX, MatchXF;
-  logic [`XLEN+3:0] 		ForwardBTBPrediction, ForwardBTBPredictionF;
+  logic [`XLEN+4:0] 		ForwardBTBPrediction, ForwardBTBPredictionF;
   logic [`XLEN+3:0] 		TableBTBPredictionF;
   logic [`XLEN-1:0] 		PredPCD;  
   logic [3:0] 				PredInstrClassD;  // *** copy of reg outside module
   logic 					UpdateEn;
-  logic 					TablePredValidF;
+  logic 					TablePredValidF, PredValidD;
     
   // hashing function for indexing the PC
   // We have Depth bits to index, but XLEN bits as the input.
@@ -78,13 +79,13 @@ module btb #(parameter int Depth = 10 ) (
   
   flopenr #(1) MatchReg(clk, reset, ~StallF, MatchNextX, MatchXF);
 
-  assign ForwardBTBPrediction = MatchF ? {BTBPredInstrClassF, PredPCF} :
-                                MatchD ? {PredInstrClassD, PredPCD} :
-                                {InstrClassE, IEUAdrE} ;
+  assign ForwardBTBPrediction = MatchF ? {PredValidF, BTBPredInstrClassF, PredPCF} :
+                                MatchD ? {PredValidD, InstrClassD, PredPCD} :
+                                {1'b1, InstrClassE, IEUAdrE} ;
 
-  flopenr #(`XLEN+4) ForwardBTBPredicitonReg(clk, reset, ~StallF, ForwardBTBPrediction, ForwardBTBPredictionF);
+  flopenr #(`XLEN+5) ForwardBTBPredicitonReg(clk, reset, ~StallF, ForwardBTBPrediction, ForwardBTBPredictionF);
 
-  assign {BTBPredInstrClassF, PredPCF} = MatchXF ? ForwardBTBPredictionF : TableBTBPredictionF;
+  assign {PredValidF, BTBPredInstrClassF, PredPCF} = MatchXF ? ForwardBTBPredictionF : {TablePredValidF, TableBTBPredictionF};
 
   always_ff @ (posedge clk) begin
     if (reset) begin
@@ -95,7 +96,7 @@ module btb #(parameter int Depth = 10 ) (
 	if(~StallF | reset) TablePredValidF = ValidBits[PCNextFIndex];
   end
 
-  assign PredValidF = MatchXF ? 1'b1 : TablePredValidF;
+  //assign PredValidF = MatchXF ? 1'b1 : TablePredValidF;
   
   assign UpdateEn = |InstrClassE | PredictionInstrClassWrongE;
 
@@ -104,6 +105,6 @@ module btb #(parameter int Depth = 10 ) (
     .clk, .ce1(~StallF | reset), .ra1(PCNextFIndex), .rd1(TableBTBPredictionF),
      .ce2(~StallM & ~FlushM), .wa2(PCEIndex), .wd2({InstrClassE, IEUAdrE}), .we2(UpdateEn), .bwe2('1));
 
-  flopenrc #(`XLEN+4) BTBD(clk, reset, FlushD, ~StallD, {BTBPredInstrClassF, PredPCF}, {PredInstrClassD, PredPCD});
+  flopenrc #(`XLEN+1) BTBD(clk, reset, FlushD, ~StallD, {PredValidF, PredPCF}, {PredValidD, PredPCD});
 
 endmodule

pipelined/src/ifu/bpred/speculativegshare.sv

@@ -36,7 +36,7 @@ module speculativegshare #(parameter int k = 10 ) (
   output logic [1:0] 	  DirPredictionF, 
   output logic 			  DirPredictionWrongE,
   // update
-  input logic [`XLEN-1:0] PCNextF, PCF, PCD, PCE, PCM,
+  input logic [`XLEN-1:0] PCNextF, PCF, PCD, PCE,
   input logic [3:0] 	  PredInstrClassF, InstrClassD, InstrClassE,
   input logic [3:0] 	  WrongPredInstrClassD, 
   input logic 			  PCSrcE