Re: MariaDB 10.11 issue on armel/armhf

[Jeffrey Walton <noloader@gmail.com>]

On Mon, Jan 16, 2023 at 10:21 PM Otto Kekäläinen <otto@debian.org> wrote:
>
> Are there any ARM experts here interested in helping MariaDB 10.11 run
> better on armel/armhf?
>
> The issue is explained well in upstream bug
> https://jira.mariadb.org/browse/MDEV-30411 but upstream is not
> investing developers/testing into armel/armhf, so I wanted to check if
> anybody here could help.
>
> Basically the upstream header
> https://github.com/MariaDB/server/tree/10.11/include/my_rdtsc.h needs
> to be extended to handle armel/armhf (and maybe also mipsel and
> mips64el) properly so it would make all official Debian architectures
> happy.

I believe Andy Polyakov performed the heavy lifting for OpenSSL. I
would check the OpenSSL code. It should not be much more than a
copy/paste. Or if you don't like the license, convert the *.pl file to
a source file to see how OpenSSL does it, then write your own.

openssl$ grep -IR rdtsc | ...

crypto/alphacpuid.pl:.end       OPENSSL_rdtsc
crypto/alphacpuid.pl:.ent       OPENSSL_rdtsc
crypto/alphacpuid.pl:.globl     OPENSSL_rdtsc
crypto/alphacpuid.pl:OPENSSL_rdtsc:
crypto/armcap.c:uint32_t OPENSSL_rdtsc(void)
crypto/c64xpluscpuid.pl:        .asg    OPENSSL_rdtsc,_OPENSSL_rdtsc
crypto/c64xpluscpuid.pl:        .global _OPENSSL_rdtsc
crypto/c64xpluscpuid.pl:_OPENSSL_rdtsc:
crypto/cpuid.c:uint32_t OPENSSL_rdtsc(void)
crypto/ia64cpuid.S:.endp   OPENSSL_rdtsc#
crypto/ia64cpuid.S:.global      OPENSSL_rdtsc#
crypto/ia64cpuid.S:.proc        OPENSSL_rdtsc#
crypto/ia64cpuid.S:OPENSSL_rdtsc:
crypto/loongarch64cpuid.pl:# uint32_t OPENSSL_rdtsc(void)
crypto/loongarch64cpuid.pl:.globl OPENSSL_rdtsc
crypto/loongarch64cpuid.pl:.type   OPENSSL_rdtsc,\@function
crypto/loongarch64cpuid.pl:OPENSSL_rdtsc:
crypto/pariscid.pl:     .EXPORT OPENSSL_rdtsc,ENTRY
crypto/pariscid.pl:OPENSSL_rdtsc
crypto/ppccap.c:        OPENSSL_rdtsc_mfspr268();
crypto/ppccap.c:        OPENSSL_rdtsc_mftb();
crypto/ppccap.c:        return OPENSSL_rdtsc_mfspr268();
crypto/ppccap.c:        return OPENSSL_rdtsc_mftb();
crypto/ppccap.c:long OPENSSL_rdtsc_mfspr268(void);
crypto/ppccap.c:long OPENSSL_rdtsc_mftb(void);
crypto/ppccap.c:uint32_t OPENSSL_rdtsc(void)
crypto/ppccpuid.pl:.OPENSSL_rdtsc_mfspr268:
crypto/ppccpuid.pl:.OPENSSL_rdtsc_mftb:
crypto/ppccpuid.pl:.globl       .OPENSSL_rdtsc_mfspr268
crypto/ppccpuid.pl:.globl       .OPENSSL_rdtsc_mftb
crypto/riscvcap.c:uint32_t OPENSSL_rdtsc(void)
crypto/s390xcpuid.pl:.globl     OPENSSL_rdtsc
crypto/s390xcpuid.pl:.size      OPENSSL_rdtsc,.-OPENSSL_rdtsc
crypto/s390xcpuid.pl:.type      OPENSSL_rdtsc,\@function
crypto/s390xcpuid.pl:OPENSSL_rdtsc:
crypto/sparcv9cap.c:uint32_t OPENSSL_rdtsc(void)
crypto/x86_64cpuid.pl:  rdtsc
crypto/x86_64cpuid.pl:  rdtsc                   # collect 1st diff
crypto/x86_64cpuid.pl:  rdtsc                   # collect 1st tick
crypto/x86_64cpuid.pl:.Loop:    rdtsc
crypto/x86_64cpuid.pl:.globl    OPENSSL_rdtsc
crypto/x86_64cpuid.pl:.size     OPENSSL_rdtsc,.-OPENSSL_rdtsc
crypto/x86_64cpuid.pl:.type     OPENSSL_rdtsc,\@abi-omnipotent
crypto/x86_64cpuid.pl:OPENSSL_rdtsc:
crypto/x86cpuid.pl:     &rdtsc  ();

You can convert a *.pl file to a source file that can be assembled or
compiled by following the instructions at
https://wiki.openssl.org/index.php/Cryptogams_AES or
https://wiki.openssl.org/index.php/Cryptogams_SHA.

Jeff