[Libre-soc-bugs] [Bug 768] fast emulation traps with trap address based on PO and XO

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=768

--- Comment #2 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #1)
> ideas: hw swap-out caller-saved regs so interrupt handler can just be a c
> function

paul mentioned something about the e300? how it was a software-emulated
MMU and consequently there was a bit in the MSR you could set which
enabled swapping at exception time of the top 4 GPRs into SPRs *in addition*
to SRR0/1

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