Commit Message
This patch adds Aarch64 SVE specific defines to glibc.
The Linux kernel changes for Aarch64 SVE have recently been pulled
into the head:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c9b012e5f4a1d01dfa8abc6318211a67ba7d5db2
Although not due to be in a kernel release until early 2018, we'd
like to make sure any glibc changes are ready for a similar time.
I haven't run any testsuites as the changes are should not effect them.
Is this ok?
Thanks,
Alan.
2017-12-08 Alan Hayward <alan.hayward@arm.com>
* elf/elf.h: Add NT_ARM_SVE.
* sysdeps/unix/sysv/linux/aarch64/bits/hwcap.h: Add HWCAP_SVE.
elf/elf.h | 2 ++
sysdeps/unix/sysv/linux/aarch64/bits/hwcap.h | 1 +
2 files changed, 3 insertions(+)
Comments
On 08/12/17 14:59, Alan Hayward wrote:
> This patch adds Aarch64 SVE specific defines to glibc.
>
> The Linux kernel changes for Aarch64 SVE have recently been pulled
> into the head:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c9b012e5f4a1d01dfa8abc6318211a67ba7d5db2
> Although not due to be in a kernel release until early 2018, we'd
> like to make sure any glibc changes are ready for a similar time.
>
> I haven't run any testsuites as the changes are should not effect them.
>
> Is this ok?
>
>
> Thanks,
> Alan.
>
>
> 2017-12-08 Alan Hayward <alan.hayward@arm.com>
>
> * elf/elf.h: Add NT_ARM_SVE.
> * sysdeps/unix/sysv/linux/aarch64/bits/hwcap.h: Add HWCAP_SVE.
>
nowadays these files need to be updated as well:
sysdeps/unix/sysv/linux/aarch64/dl-procinfo.h
sysdeps/unix/sysv/linux/aarch64/dl-procinfo.c
glibc release is in february so we have more time,
ideally we would wait for the kernel release.
On 08/12/17 14:59, Alan Hayward wrote:
> This patch adds Aarch64 SVE specific defines to glibc.
...
>
> 2017-12-08 Alan Hayward <alan.hayward@arm.com>
>
> * elf/elf.h: Add NT_ARM_SVE.
> * sysdeps/unix/sysv/linux/aarch64/bits/hwcap.h: Add HWCAP_SVE.
i plan to apply the elf.h part of this patch
and then do the hwcap.h update separately.
> On 11 Jan 2018, at 17:37, Szabolcs Nagy <Szabolcs.Nagy@arm.com> wrote:
>
> On 08/12/17 14:59, Alan Hayward wrote:
>> This patch adds Aarch64 SVE specific defines to glibc.
> ...
>>
>> 2017-12-08 Alan Hayward <alan.hayward@arm.com>
>>
>> * elf/elf.h: Add NT_ARM_SVE.
>> * sysdeps/unix/sysv/linux/aarch64/bits/hwcap.h: Add HWCAP_SVE.
>
> i plan to apply the elf.h part of this patch
> and then do the hwcap.h update separately.
>
Thanks for that!
I took a look at the dl-procinfo.c and it looked simple enough, but haven’t had
the time test to write the patch. Also, I wasn’t sure the best way to test the code
(Didn’t seem anything relevant in the test suite and I’m not sure how to use libc
to access the changes directly).
Alan.
@@ -795,6 +795,8 @@ typedef struct
#define NT_ARM_HW_BREAK 0x402 /* ARM hardware breakpoint registers */
#define NT_ARM_HW_WATCH 0x403 /* ARM hardware watchpoint registers */
#define NT_ARM_SYSTEM_CALL 0x404 /* ARM system call number */
+#define NT_ARM_SVE 0x405 /* ARM Scalable Vector Extension
+ registers */
/* Legal values for the note segment descriptor types for object files. */
@@ -38,3 +38,4 @@
#define HWCAP_FCMA (1 << 14)
#define HWCAP_LRCPC (1 << 15)
#define HWCAP_DCPOP (1 << 16)
+#define HWCAP_SVE (1 << 22)