Messages in this thread | | | From | Nick Desaulniers <> | Date | Thu, 24 May 2018 13:52:16 -0700 | Subject | Re: [clang] stack protector and f1f029c7bf |
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On Thu, May 24, 2018 at 1:26 PM Nick Desaulniers <ndesaulniers@google.com> wrote: > On Thu, May 24, 2018 at 11:59 AM <hpa@zytor.com> wrote: > > Issue 3: Let's face it, reading and writing the flags should be builtins, > exactly because it has to do stack operations, which really means the > compiler should be involved.
> I'm happy to propose that as a feature request to llvm+gcc.
Oh, looks like both clang and gcc have: __builtin_ia32_readeflags_u64()
https://godbolt.org/g/SwPjhq
Maybe native_save_fl() and native_restore_fl() should be replaced in the kernel with __builtin_ia32_readeflags_u64() and __builtin_ia32_writeeflags_u64()? -- Thanks, ~Nick Desaulniers
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