linux-kernel - Re: [PATCH v4 0/4] LoongArch: Support new relocation types

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Message-ID: <d6cab26afc5829c1b93bc1cc5867ebf22f5c7f47.camel@xry111.site>
Date:   Mon, 01 Aug 2022 19:39:54 +0800
From:   Xi Ruoyao <xry111@...111.site>
To:     Youling Tang <tangyouling@...ngson.cn>,
        Jinyang He <hejinyang@...ngson.cn>
Cc:     Huacai Chen <chenhuacai@...nel.org>, loongarch@...ts.linux.dev,
        LKML <linux-kernel@...r.kernel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Lulu Cheng <chenglulu@...ngson.cn>
Subject: Re: [PATCH v4 0/4] LoongArch: Support new relocation types

On Mon, 2022-08-01 at 19:28 +0800, Youling Tang wrote:

> > Actually, I really hope kernel image is in the XKVRANGE, rather
> > than being in XKPRANGE. So that we can limit kernel and modules
> > be in 4GB range. I think it will make all work normally. :-(
> > 
> 
> Assuming that the kernel and modules are limited to 4G, the external
> symbols will be accessed through pcrel32, which means that there is no
> need to pass the GOT table entry and there is no need for got support

We'll still need to modify GCC to use PC-rel for accessing an object in
another TU (by default, or an option to control), instead of GOT.  Or
just add support to GOT relocations here.  But anyway it will be much
easier as we won't need to handle per-CPU variables specially.
-- 
Xi Ruoyao <xry111@...111.site>
School of Aerospace Science and Technology, Xidian University