Messages in this thread | | | Date | Wed, 18 Jan 2012 13:30:25 -0800 | From | "H. Peter Anvin" <> | Subject | Re: Compat 32-bit syscall entry from 64-bit task!? |
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On 01/18/2012 01:26 PM, Linus Torvalds wrote: > 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. >
I would have assumed it would be a new register set (which could be expanded in the future if we have additional system information to provide.)
-hpa
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