Exception trigger introducing a breakpoint exception

[DingKai Huang]

Hi,

When an exception hits etrigger and introduces a breakpoint exception, mcause will be overwritten with 3 (breakpoint).

In this case, how can the software know the original exception cause? Assuming multiple bits in tdata2 are set.

It seems that the original exception cause can only be reserved when the etrigger.action is "enter debug mode".

Thanks,

DingKai

[justin james]

DingKai https://android.stackexchange.com/questions/105503/how-to-transfer-files-between-bluestacks-and-windows-pc

[Tim Newsome]

https://github.com/riscv/riscv-debug-spec/pull/309 attempts to solve this problem by allowing implementations to disable triggers that cause breakpoint exceptions while in exception handlers.

Tim

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