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JAL handling procedure #39

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RojasMilo opened this issue May 5, 2020 · 1 comment
Open

JAL handling procedure #39

RojasMilo opened this issue May 5, 2020 · 1 comment

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@RojasMilo
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@RojasMilo RojasMilo commented May 5, 2020

I have been working with the riscv-formal for a couple of months now.
Arithmetic, load and store checks are passing but I want to ask you what would be the procedure for a JAL?, at the end of the pipe I have 2 PC values without importance when JAL comes.

I see the correct PC in the pipe.

But how could I tell that the data is not ready yet? if I put the jump trigger signal in the valid the output is warmup!

I am working with a SIIO 5-stage pipeline core.

Thank you for a great tool.

@RojasMilo
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@RojasMilo RojasMilo commented Jun 9, 2020

Hi, I still have this question, but now JAL and JALR are passing.

I add a mux in the RVFI and when JAL comes, it performs a forwarding data from EX to WB. Delivering the correct destination address.

These strategi allow me to find a bug in JALR calculation, do you think is a valid approach?

Thanks

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