linux-kernel - Re: [PATCH 06/27] [AARCH64] Use PTR_REG/PTR_SIZE/PTR_SIZE

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Date:	Tue, 21 Jun 2016 10:05:35 +0200
From:	Andreas Schwab <schwab@...e.de>
To:	Yury Norov <ynorov@...iumnetworks.com>
Cc:	<libc-alpha@...rceware.org>, <linux-kernel@...r.kernel.org>,
	<arnd@...db.de>, <catalin.marinas@....com>,
	<marcus.shawcroft@....com>, <philb@....org>, <davem@...emloft.net>,
	<szabolcs.nagy@....com>, <maxim.kuvyrkov@...aro.org>,
	<joseph@...esourcery.com>, <pinskia@...il.com>,
	Andrew Pinski <apinski@...ium.com>
Subject: Re: [PATCH 06/27] [AARCH64] Use PTR_REG/PTR_SIZE/PTR_SIZE_LOG in dl-tlsesc.S

Yury Norov <ynorov@...iumnetworks.com> writes:

> From: Andrew Pinski <apinski@...ium.com>
>
> This converts dl-tlsdesc.S code over to use the new macros which allows for
> sharing between ILP32 and LP64 code.
>
> * sysdeps/aarch64/dl-tlsdesc.S (_dl_tlsdesc_return): Use PTR_REG.
> (_dl_tlsdesc_undefweak): Use PTR_REG, PTR_SIZE.
> (_dl_tlsdesc_dynamic): Likewise.
> (_dl_tlsdesc_resolve_rela): Likewise.
> (_dl_tlsdesc_resolve_hold): Likewise.

I think you also need to fix _dl_tlsdesc_return_lazy.

>
> Signed-off-by: Yury Norov <ynorov@...iumnetworks.com>
> ---
>  sysdeps/aarch64/dl-tlsdesc.S | 36 ++++++++++++++++++------------------
>  1 file changed, 18 insertions(+), 18 deletions(-)
>
> diff --git a/sysdeps/aarch64/dl-tlsdesc.S b/sysdeps/aarch64/dl-tlsdesc.S
> index 05be370..fe8a17d 100644
> --- a/sysdeps/aarch64/dl-tlsdesc.S
> +++ b/sysdeps/aarch64/dl-tlsdesc.S
> @@ -74,7 +74,7 @@
>  	cfi_startproc
>  	.align 2
>  _dl_tlsdesc_return:
> -	ldr	x0, [x0, #8]
> +	ldr	PTR_REG (0), [x0, #PTR_SIZE]
>  	RET
>  	cfi_endproc
>  	.size	_dl_tlsdesc_return, .-_dl_tlsdesc_return
> @@ -126,9 +126,9 @@ _dl_tlsdesc_undefweak:
>  	   td->entry in _dl_tlsdesc_resolve_rela_fixup ensuring that the load
>  	   from [x0,#8] here happens after the initialization of td->arg.  */
>  	ldar	xzr, [x0]

Does that need to be PTR_REG(zr)?

> -	ldr	x0, [x0, #8]
> +	ldr	PTR_REG (0), [x0, #PTR_SIZE]
>  	mrs	x1, tpidr_el0
> -	sub	x0, x0, x1
> +	sub	PTR_REG (0), PTR_REG (0), PTR_REG (1)
>  	ldr	x1, [sp], #16
>  	cfi_adjust_cfa_offset (-16)
>  	RET
> @@ -189,20 +189,20 @@ _dl_tlsdesc_dynamic:
>  	   td->entry in _dl_tlsdesc_resolve_rela_fixup ensuring that the load
>  	   from [x0,#8] here happens after the initialization of td->arg.  */
>  	ldar	xzr, [x0]

Likewise.

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab@...e.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."