On Tue, Oct 29, 2019 at 10:45 AM Sami Tolvanen <samitolvanen@xxxxxxxxxx> wrote: > > On Fri, Oct 25, 2019 at 4:03 AM Mark Rutland <mark.rutland@xxxxxxx> wrote: > > We have a similar issue with pointer authentication, and we're solving > > that with -fpatchable-function-entry, which allows us to hook the > > callsite before it does anything with the return address. IIUC we could > > use the same mechanism here (and avoid introducing a third). > > > > Are there plans to implement -fpatchable-function-entry on the clang > > side? > > I'm not sure if there are plans at the moment, but if this feature is > needed for PAC, adding it to clang shouldn't be a problem. Nick, did > you have any thoughts on this? I didn't see anything explicitly in LLVM's issue tracker. I also didn't see -fpatchable-function-entry currently in -next other than under arch/parisc. Are there patches I can look at? Has ARM's kernel team expressed the need to ARM's LLVM team? -- Thanks, ~Nick Desaulniers
