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Re: [PATCH v5 2/3] x86/asm: Add suffix macro for GEN_*_RMWcc()

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On Tue, May 30, 2017 at 02:39:51PM -0700, Kees Cook wrote:
> The coming x86 refcount protection needs to be able to add trailing
> instructions to the GEN_*_RMWcc() operations. This extracts the
> difference between the goto/non-goto cases so the helper macros
> can be defined outside the #ifdef cases. Additionally adds argument
> naming to the resulting asm for referencing from suffixed
> instructions, and adds clobbers for "cc", and "cx" to let suffixes
> use _ASM_CX, and retain any set flags.

Another option is to simply require __GCC_ASM_FLAG_OUTPUT__ for the fast
refcount stuff. That would result in simpler and more readable code.

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[PATCH v5 0/3] Implement fast refcount overflow protection Kees Cook <keescook@chromium.org> - 2017-05-30 23:50 +0200
  [PATCH v5 2/3] x86/asm: Add suffix macro for GEN_*_RMWcc() Kees Cook <keescook@chromium.org> - 2017-05-30 23:50 +0200
    Re: [PATCH v5 2/3] x86/asm: Add suffix macro for GEN_*_RMWcc() Peter Zijlstra <peterz@infradead.org> - 2017-05-31 13:20 +0200
      Re: [PATCH v5 2/3] x86/asm: Add suffix macro for GEN_*_RMWcc() Kees Cook <keescook@chromium.org> - 2017-05-31 15:20 +0200
        Re: [PATCH v5 2/3] x86/asm: Add suffix macro for GEN_*_RMWcc() Peter Zijlstra <peterz@infradead.org> - 2017-05-31 16:10 +0200
          Re: [PATCH v5 2/3] x86/asm: Add suffix macro for GEN_*_RMWcc() Kees Cook <keescook@chromium.org> - 2017-05-31 18:10 +0200
  Re: [PATCH v5 0/3] Implement fast refcount overflow protection Davidlohr Bueso <dave@stgolabs.net> - 2017-05-31 14:30 +0200
    Re: [PATCH v5 0/3] Implement fast refcount overflow protection Kees Cook <keescook@chromium.org> - 2017-05-31 15:30 +0200

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