Re: [PATCH 2/2] Remove vestiges of NaCl port from ARM assembly files.

[Matt Turner <mattst88@gmail.com>]

On Fri, May 12, 2017 at 7:09 AM, Joseph Myers <joseph@codesourcery.com> wrote:
> On Fri, 12 May 2017, Florian Weimer wrote:
>
>> On 05/12/2017 02:37 AM, Zack Weinberg wrote:
>> > This semi-mechanical patch removes all uses and definitions of the
>> > sfi_breg, sfi_pld, and sfi_sp macros from various ARM-specific
>> > assembly files.  These were only used by NaCl.  Please read carefully,
>> > I don't have any ARM hardware to test this patch on and I may have
>> > screwed up my regular expressions.
>>
>> I did a build on an armv7l-redhat-linux-gnueabihf system, and the libc.so.6
>> file had identical disassembly before and after the build, so I assume that
>> this is okay.
>
> Yes, it's OK given that testing and the removal of the NaCl port itself.
>
> (There are several other defines in sysdeps/arm/nacl/arm-features.h that
> are never defined for non-NaCl, or have constant definitions for non-NaCl
> - ARM_ALWAYS_BX, ARM_BX_ALIGN_LOG2, ARM_NO_INDEX_REGISTER - and which
> should probably be cleaned up as well eventually in separate patches, but
> the sfi_* are by far the most invasive.  ARM_ASSUME_NO_IWMMXT is only
> defined for NaCl at present, but logically could be defined for all builds
> for ARMv6 and later (__ARM_ARCH >= 6, given GCC 4.8 or later or the
> __ARM_ARCH emulation in sysdep.h) as iWMMXt is only on certain v5TE
> processors.  NO_THUMB is more complicated in that only NaCl defines it in
> arm-features.h, but some individual .S files define it as well.)

Some Marvell CPUs have iwMMXt, like the one in the OLPC XO 1.75. It's am ARMv7.