[PATCH] Add biarch support for powerpc64

[Andreas Schwab]

Roland McGrath <roland at redhat.com> writes:

> Is there any actual benefit to arch=powerpc64 and the separate directory of
> files that all just #include the powerpc files?  I think we'd do as well
> just to leave arch=powerpc for the powerpc64 configuration.  It doesn't
> seem likely that these lists will diverge for ppc32/ppc64 in the future.

Actually I originally planned to make the ppc64 syscall table different
from the ppc32 table, leaving out the unimplemented and 32-bit only
syscalls.

> To support those systems more smoothly, we could also make ppc32
> strace use PTRACE_GETREGS64 to support ppc64 tracees, but that would
> require much more work in the inverse biarch decoding support.

There are a lot of places that assume you can read sizeof(long) worth of
data from the u-area to read a register's contents.  That won't work on
ppc32 targeting ppc64 whereas it works fine the other way round.

Andreas.

-- 
Andreas Schwab, schwab at linux-m68k.org
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