Date: Wed, 14 Oct 2015 15:51:42 -0400 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: [PATCHv3 1/3] fix matching errors for overwritten registers in x86 CFI generation script On Wed, Oct 14, 2015 at 09:44:50PM +0200, Alex wrote: > On Wed, Oct 14, 2015 at 9:27 PM, Rich Felker <dalias@...c.org> wrote: > > > On Wed, Oct 14, 2015 at 09:23:59PM +0200, Alex wrote: > > > On Wed, Oct 14, 2015 at 9:14 PM, Rich Felker <dalias@...c.org> wrote: > > > > > > > On Wed, Oct 14, 2015 at 12:21:05PM +0200, Alex wrote: > > > > > This has been an interesting exercise so far. Is there any other arch > > > > which > > > > > you think it would be worthwhile to develop a CFI generation script > > for? > > > > It > > > > > should be something which has enough users to avoid problems with > > bitrot. > > > > > > > > CFI is probably a lot less interesting on archs where you have a > > > > plenty registers not to need to manipulate stack frames in asm > > > > functions, since in that case the debugger mostly works fine without > > > > CFI. I don't know right off which of the other archs have significant > > > > amounts of asm that adjusts the stack pointer, but you could go > > > > through and check them. Having ABI info for them all would be helpful; > > > > I'm pasting my draft ABI reference (which might have errors) below. > > > > > > Fair enough. If it's not likely to help anyone, I'll leave the CFI > > > generation here. > > > > > > Another idea: are you interested in an implementation of POSIX AIO which > > > uses the native AIO syscalls? Bad idea? > > > > Those syscalls have nothing at all to do with POSIX AIO. They're > > completely different. :( > > The interface presented by the raw syscalls is not the POSIX AIO interface, > but I haven't seen any reason yet why io_setup, io_submit, io_getevents, > etc. couldn't be used to implement the POSIX AIO interface. Is there such a > reason? They only work on certain types of devices/files, and only when the offset and memory source/dest meet some arbitrary alignment requirements. And those are just the big problems. I don't see any indication that they match the subtle behavior requirements for POSIX AIO in any way. Rich
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