[Libre-soc-bugs] [Bug 238] POWER Compressed Formal Standard writeup

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=238

--- Comment #174 from Alexandre Oliva <oliva at gnu.org> ---
I'm also getting very concerned about how to preserve the
switch-back-to-compressed-mode state across interrupts.  I can't work out how
to do it.

if there's a register that holds this bit, it would have to be saved across the
interrupt, but by the time we're running the interrupt handler code that would
preserve it, it would already be overwritten

whereas if it's architecturally saved in another register by the architecture's
start-interrupt behavior, then that save register might be overwritten by
another interrupt before the first handler gets a chance to save it

lots of assumptions here, that might not hold, but we have to have that worked
out and documented IMHO

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