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busybear: add better warning on illegal instruction

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...also it seems that mret is being picked up as an illegal instruction??
This commit is contained in:
Noah Boorstin 2021-03-22 18:24:31 -04:00
parent 34b8f750ce
commit 849641f31e
1 changed files with 7 additions and 1 deletions
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8
wally-pipelined/testbench/testbench-busybear.sv
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@ -262,8 +262,14 @@ module testbench_busybear();
end
always @(dut.hart.priv.csr.genblk1.csrm.MCAUSE_REGW) begin
if (dut.hart.priv.csr.genblk1.csrm.MCAUSE_REGW == 2 && instrs != 0) begin
$display("!!!!!! illegal instruction !!!!!!!!!!");
$display("(as a reminder, MCAUSE and MEPC are set by this)");
$display("at %0t ps, instr %0d, HADDR %x", $time, instrs, HADDR);
`ERROR
end
if (dut.hart.priv.csr.genblk1.csrm.MCAUSE_REGW == 5 && instrs != 0) begin
$display("!!!!!!illegal (physical) memory access !!!!!!!!!!");
$display("!!!!!! illegal (physical) memory access !!!!!!!!!!");
$display("(as a reminder, MCAUSE and MEPC are set by this)");
$display("at %0t ps, instr %0d, HADDR %x", $time, instrs, HADDR);
`ERROR