RFR: 8294211: Zero: Decode arch-specific error context if possible [v2]

[Aleksey Shipilev]

On Thu, 22 Sep 2022 18:59:12 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> src/hotspot/os_cpu/linux_zero/os_linux_zero.cpp line 390:
>> 
>>> 388: 
>>> 389: void os::print_context(outputStream* st, const void* ucVoid) {
>>> 390:   st->print_cr("No context information.");
>> 
>> Regrettable, maybe something for a future RFE?
>
> Yes. I don't want to copy-paste the whole arch-specific code into this file. The bare minimum to have reasonable `hs_err`-s should do :)

I forgot to mention why I do this. If we leave `ShouldNotCallThis()` here, then error handler does a secondary fault in these methods, and `hs_err` prints errors in these sections. So the deal here is removing the risky secondary fault -- I see no reason for it -- rather than printing out more info. When we can do that easily, like in the TOS and PC sections, we do.

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PR: https://git.openjdk.org/jdk/pull/10397