[Bug 243155] Linuxulator: broken fadvise64 for 32-bit applications on amd64

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243155

--- Comment #3 from Mark Johnston <markj at FreeBSD.org> ---
I think this is a problem with truss rather than the kernel.  Really there's
two problems:

1. We don't define distinct syscall argument structures for Linux32 vs Linux64.
 That is, freebsd32_posix_fadvise_args splits the off_t arguments into two
fields, but linux_fadvise64_args (used in the Linux32 sysent table) does not. 
So for a posix_fadvise() call in a 32-bit FreeBSD binary on amd64, truss
prints:

    freebsd32_posix_fadvise(0x1,0x2,0x0,0x3,0x0,0x4) ERR#19 'Operation not
supported by device'

Obviously not perfect either, but at least you can see what's happening.

2. truss doesn't call quad_fixup() on 64-bit platforms even when the target ABI
is freebsd32 or linux32.  Otherwise it could fix the splitting that I described
above and always print four arguments like one would expect.

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