Re: Contributing to the glibc Project

[Adhemerval Zanella <adhemerval dot zanella at linaro dot org>]

Hi Nam-goo Lee,

Thanks for taking interest in working with glibc. At this link [1]
you will find a descriptive checklist of what is required and
suggested to do before starting send patches to libc-alpha.  Pay
special attention at item '9. FSF copyright Assignment' since
without it we can't take your contributions.

Regarding your specific interest, in fact there are multiple
string implementation for ARM:

$ find sysdeps/arm/ -iname 'str*' -o -iname 'mem*'
sysdeps/arm/armv6t2/memchr.S
sysdeps/arm/armv6t2/strlen.S
sysdeps/arm/memusage.h
sysdeps/arm/memcpy.S
sysdeps/arm/memset.S
sysdeps/arm/memmove.S
sysdeps/arm/strlen.S
sysdeps/arm/armv7/multiarch/memcpy_impl.S
sysdeps/arm/armv7/multiarch/memcpy.S
sysdeps/arm/armv7/multiarch/memcpy_neon.S
sysdeps/arm/armv7/multiarch/memcpy_vfp.S
sysdeps/arm/armv7/strcmp.S
sysdeps/arm/armv6/strcpy.S
sysdeps/arm/armv6/strchr.S
sysdeps/arm/armv6/strlen.S
sysdeps/arm/armv6/strrchr.S

For strlen we do have an armv6, armv6 thumb2, and the default one
which should work on minimum supported arm (armv5?).

Also note that for armv7+ we use ifunc to select of different
implementation for memcpy. One possible work I would suggest you
and use the memcpy* for amrv7 and create also a multiarch memmove
implementation based on current armv7 strategies, since armv7 
still uses the default memmove.S implementation.

[1] https://sourceware.org/glibc/wiki/Contribution%20checklist

On 13/10/2016 02:37, Nam-goo Lee wrote:
> Hi.
> 
> I'd like to contribute to the glibc project.
> I've checked the jobs listed on the PROJECT file.
> I became interested on the job number [8] - assembly programming.
> I'd like to work on the ARM architecture.
> 
> Looking at the codes under the /sysdeps/arm directory, it seems there
> is only one assembly code for the string handling functions: strlen.S.
> I'd like to contribute to the project by committing assembly codes of
> the string handling functions for the ARM architecture.
> 
> If this job is available, it'll be my first contribution to an
> open-source project, and I'm really excited and looking forward to
> joining the glibc developer community.
> 
> Best regards,
> Nam-goo Lee
>