[PATCH] powerpc64: Implement TLS using PC-relative addressing

[Florian Weimer]

* Tulio Magno Quites Machado Filho via Libc-alpha:

> diff --git a/sysdeps/powerpc/mod-tlsopt-powerpc.c b/sysdeps/powerpc/mod-tlsopt-powerpc.c
> index ee0db12a73..5856dab60b 100644
> --- a/sysdeps/powerpc/mod-tlsopt-powerpc.c
> +++ b/sysdeps/powerpc/mod-tlsopt-powerpc.c
> @@ -24,7 +24,14 @@ tls_get_addr_opt_test (void)
>    tls_index *tls_arg;
>  #ifdef __powerpc64__
>    register unsigned long thread_pointer __asm__ ("r13");
> +  /* PC-relative addressing is available when compiling with -mpcrel.
> +     The first releases of GCC 10 do support -mpcrel, but do not export
> +     __PCREL__.  */
> +# if defined(__PCREL__) || __GNUC__ <= 10 && defined(_ARCH_PWR10)
> +  asm ("pla %0,foo@got@tlsgd@pcrel" : "=r" (tls_arg));
> +# else
>    asm ("addi %0,2,foo@got@tlsgd" : "=r" (tls_arg));
> +# endif

Should this check for binutils support for @pcrel?  Or won't GCC enable
_ARCH_PWR10 in this case?

Thanks,
Florian
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