+ 16'b????????10000000: begin
+ cur_reg = 4'h7;
+ next_regs = {regs[15:8], 8'b0};
+ end
+ 16'b???????100000000: begin
+ cur_reg = 4'h8;
+ next_regs = {regs[15:9], 9'b0};
+ end
+ 16'b??????1000000000: begin
+ cur_reg = 4'h9;
+ next_regs = {regs[15:10], 10'b0};
+ end
+ 16'b?????10000000000: begin
+ cur_reg = 4'hA;
+ next_regs = {regs[15:11], 11'b0};
+ end
+ 16'b????100000000000: begin
+ cur_reg = 4'hB;
+ next_regs = {regs[15:12], 12'b0};
+ end
+ 16'b???1000000000000: begin
+ cur_reg = 4'hC;
+ next_regs = {regs[15:13], 13'b0};
+ end
+ 16'b??10000000000000: begin
+ cur_reg = 4'hD;
+ next_regs = {regs[15:14], 14'b0};
+ end
+ 16'b?100000000000000: begin
+ cur_reg = 4'hE;
+ next_regs = {regs[15], 15'b0};
+ end
+ 16'b1000000000000000: begin
+ cur_reg = 4'hF;
+ next_regs = 16'b0;
+ end
+ default: begin
+ cur_reg = 4'hx;
+ next_regs = 16'b0;
+ end
+ endcase
+ cur_reg = insn[23] ? 4'hF - cur_reg : cur_reg;
+ if(cur_reg == 4'hF && insn[22]) begin
+ next_outcpsr = spsr;
+ end
+
+ if(rw_wait) begin
+ next_regs = regs;
+ cur_reg = prev_reg;
+ raddr = prev_raddr;
+ end
+ else begin
+ offset = prev_offset + 6'h4;
+ offset_sel = insn[24] ? offset : prev_offset;
+ raddr = insn[23] ? op0 + {26'b0, offset_sel} : op0 - {26'b0, offset_sel};
+ if(insn[20]) begin
+ next_write_reg = 1'b1;
+ next_write_num = cur_reg;
+ next_write_data = rd_data;
+ end
+ end
+
+ st_read = cur_reg;
+ wr_data = st_data;
+ busaddr = {raddr[31:2], 2'b0};
+
+ outstall = 1'b1;
+
+ if(next_regs == 16'b0) begin
+ next_lsm_state = 3'b100;
+ end
+ end
+ 3'b100: begin
+ next_write_reg = 1'b1;
+ next_write_num = insn[19:16];
+ next_write_data = insn[23] ? op0 + {26'b0, prev_offset} : op0 - {26'b0, prev_offset};
+ next_lsm_state = 3'b001;
+ end
+ default: begin end
+ endcase
+ end
+ `DECODE_LDCSTC: if(!inbubble) begin
+ $display("WARNING: Unimplemented LDCSTC");
+ end
+ `DECODE_CDP: if(!inbubble) begin
+ cp_req = 1;
+ if (cp_busy) begin
+ outstall = 1;
+ next_outbubble = 1;
+ end
+ if (!cp_ack) begin
+ /* XXX undefined instruction trap */
+ $display("WARNING: Possible CDP undefined instruction");