execute: do stuff only if bubble, still incorrect

[firearm.git] / system.v

diff --git a/system.v b/system.v
index 0961c30274a1b0ce96e909ebe0dd4d2aba4825b6..f80f327e1511474403b2ef3b566e6ef5839314ae 100644 (file)
--- a/system.v
+++ b/system.v
@@ -27,7 +27,7 @@ module System(input clk);
        assign bus_rd = bus_rd_icache;
        assign bus_wr = bus_wr_icache;
        assign bus_ready = bus_ready_blockram;
-       
+
        wire [31:0] icache_rd_addr;
        wire icache_rd_req;
        wire icache_rd_wait;
@@ -44,6 +44,8 @@ module System(input clk);
        wire execute_out_write_reg;
        wire [3:0] execute_out_write_num;
        wire [31:0] execute_out_write_data;
+       wire [31:0] jmppc;
+       wire jmp;
        
        wire bubble_out_fetch;
        wire bubble_out_issue;
@@ -51,7 +53,11 @@ module System(input clk);
        wire [31:0] insn_out_issue;
        wire [31:0] pc_out_fetch;
        wire [31:0] pc_out_issue;
-       
+
+       wire execute_outflush = jmp;
+       wire issue_flush = execute_outflush;
+       wire execute_flush = 1'b0;
+
        BusArbiter busarbiter(.bus_req(bus_req), .bus_ack(bus_ack));
 
        ICache icache(
@@ -75,14 +81,14 @@ module System(input clk);
                .Nrst(1'b1 /* XXX */),
                .rd_addr(icache_rd_addr), .rd_req(icache_rd_req),
                .rd_wait(icache_rd_wait), .rd_data(icache_rd_data),
-               .stall(stall_cause_issue), .jmp(1'b0 /* XXX */), .jmppc(32'b0 /* XXX */),
+               .stall(stall_cause_issue), .jmp(jmp), .jmppc(jmppc),
                .bubble(bubble_out_fetch), .insn(insn_out_fetch),
                .pc(pc_out_fetch));
        
        Issue issue(
                .clk(clk),
                .Nrst(1'b1 /* XXX */),
-               .stall(stall_cause_execute), .flush(1'b0 /* XXX */),
+               .stall(stall_cause_execute), .flush(issue_flush),
                .inbubble(bubble_out_fetch), .insn(insn_out_fetch),
                .inpc(pc_out_fetch), .cpsr(32'b0 /* XXX */),
                .outstall(stall_cause_issue), .outbubble(bubble_out_issue),
@@ -104,14 +110,16 @@ module System(input clk);
        
        Execute execute(
                .clk(clk), .Nrst(1'b0),
-               .stall(1'b0 /* XXX */), .flush(1'b0 /* XXX */),
+               .stall(1'b0 /* XXX */), .flush(execute_flush),
                .inbubble(bubble_out_issue), .pc(pc_out_issue), .insn(insn_out_issue),
                .cpsr(32'b0 /* XXX */), .spsr(decode_out_spsr), .op0(decode_out_op0), .op1(decode_out_op1),
                .op2(decode_out_op2), .carry(decode_out_carry),
                .outstall(stall_cause_execute), .outbubble(execute_out_bubble),
                .write_reg(execute_out_write_reg), .write_num(execute_out_write_num),
-               .write_data(execute_out_write_data));
-       
+               .write_data(execute_out_write_data),
+               .jmppc(jmppc),
+               .jmp(jmp));
+
        reg [31:0] clockno = 0;
        always @(posedge clk)
        begin
@@ -120,6 +128,6 @@ module System(input clk);
                $display("%3d: FETCH:            Bubble: %d, Instruction: %08x, PC: %08x", clockno, bubble_out_fetch, insn_out_fetch, pc_out_fetch);
                $display("%3d: ISSUE:  Stall: %d, Bubble: %d, Instruction: %08x, PC: %08x", clockno, stall_cause_issue, bubble_out_issue, insn_out_issue, pc_out_issue);
                $display("%3d: DECODE:                      op1 %08x, op2 %08x, op3 %08x, carry %d", clockno, decode_out_op0, decode_out_op1, decode_out_op2, decode_out_carry);
-               $display("%3d: EXEC:   Stall: %d, Bubble: %d, Output: %d, [%08x -> %d]", clockno, stall_cause_execute, execute_out_bubble, execute_out_write_reg, execute_out_write_data, execute_out_write_num);
+               $display("%3d: EXEC:   Stall: %d, Bubble: %d, Reg: %d, [%08x -> %d], Jmp: %d [%08x]", clockno, stall_cause_execute, execute_out_bubble, execute_out_write_reg, execute_out_write_data, execute_out_write_num, jmp, jmppc);
        end
 endmodule