linux-kernel - Re: [PATCH 3/5] LoongArch: Support relocation against _GLOBAL_OFFSET_TABLE

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Message-ID: <1671786a-d2a5-5f98-e8be-244ba0a91e91@loongson.cn>
Date:   Thu, 28 Jul 2022 19:21:10 +0800
From:   Jinyang He <hejinyang@...ngson.cn>
To:     Xi Ruoyao <xry111@...111.site>, loongarch@...ts.linux.dev
Cc:     linux-kernel@...r.kernel.org, WANG Xuerui <kernel@...0n.name>,
        Huacai Chen <chenhuacai@...nel.org>
Subject: Re: [PATCH 3/5] LoongArch: Support relocation against
 _GLOBAL_OFFSET_TABLE_

On 07/28/2022 06:57 PM, Xi Ruoyao wrote:

> On Thu, 2022-07-28 at 17:14 +0800, Jinyang He wrote:
>> Not sure but maybe re-align is needed here.
>> Since '{BYTE(0)}' actually use 1byte. _GLOABL_OFFSET_TABLE_ may have
>> difference with really GOT table entry. Have no machine and without
>> test... :-(
> BYTE(0) is only for preventing the linker from removing the section.
> All we want from the linker is a slot for .got in the section table, and
> the actual property (including size) will be filled at runtime by
> module_frob_arch_sections.  The first GOT entry won't be "appended"
> after one byte, it is wrote into the start of .got (at runtime).
Thank you for the detail answer which solves a doubt
that bothered me for a long time. I used to define the
'sym' outside of '.sec'. It always failed without align.