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Prevent writes to x0

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This commit is contained in:
Olof Kindgren 2018-12-25 13:44:38 +01:00
parent 8ae05ea4cf
commit ba79ffdf0b
1 changed files with 11 additions and 3 deletions
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14
rtl/serv_regfile.v
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@ -58,11 +58,11 @@ module serv_regfile
end
assign o_rs1 = (|i_rs1_addr) & rs1_r;
assign o_rs2 = (|i_rs2_addr) & (rs1_en ? rs2 : rdata[0]);
assign o_rs1 = rs1_r;
assign o_rs2 = (rs1_en ? rs2 : rdata[0]);
wire [8:0] waddr = {i_rd_addr, wcnt[4:1]};
wire wr_en = wcnt[0] & i_rd_en;
wire wr_en = wcnt[0] & i_rd_en & (|i_rd_addr);
wire [8:0] raddr = {!rs1_en ? i_rs1_addr : i_rs2_addr, rcnt[4:1]};
@ -73,4 +73,12 @@ module serv_regfile
memory[waddr] <= wdata;
rdata <= memory[raddr];
end
`ifdef RISCV_FORMAL
integer i;
initial
for (i=0;i<512;i=i+1)
memory[i] = 2'd0;
`endif
endmodule