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    SubjectRe: Compat 32-bit syscall entry from 64-bit task!?
    On Wed, Jan 18, 2012 at 1:04 PM, H. Peter Anvin <hpa@zytor.com> wrote:
    >
    > Fair enough.  Sigh.  I still think an actual pseudo-register would be
    > better.

    .. and that breaks existing binaries too, because the indexing is
    based on offsets into "struct pt_regs", and while we *could* change
    that - leave pt_regs untouched but add a new virtual register - it
    would be problematic.

    We could add a whole new ptrace() access command (eg
    PTRACE_GETSYSTEMREGSET), of course. But that's a lot of effort for
    very little gain.

    So on the whole, putting it in eflags seemed like the *much* simpler approach.

    Linus
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