lkml.org 
[lkml]   [2017]   [May]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v5 2/3] x86/asm: Add suffix macro for GEN_*_RMWcc()
On Wed, May 31, 2017 at 06:17:16AM -0700, Kees Cook wrote:
> On Wed, May 31, 2017 at 4:13 AM, Peter Zijlstra <peterz@infradead.org> wrote:
> > 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.
>
> What versions of GCC support that?

IIRC 6+

\
 
 \ /
  Last update: 2017-05-31 16:04    [W:0.093 / U:0.484 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site