linux-kernel - Re: [PATCH v1 5/6] objtool: Add skipped member in struct reloc

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Message-ID: <b6b596a1311d9a26e19ee831a2f8161c175c4ad6.camel@xry111.site>
Date:   Wed, 09 Aug 2023 19:51:35 +0800
From:   Xi Ruoyao <xry111@...111.site>
To:     Peter Zijlstra <peterz@...radead.org>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc:     Josh Poimboeuf <jpoimboe@...nel.org>,
        Huacai Chen <chenhuacai@...nel.org>, loongarch@...ts.linux.dev,
        linux-kernel@...r.kernel.org, loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH v1 5/6] objtool: Add skipped member in struct reloc

On Thu, 2023-08-03 at 14:11 +0200, Peter Zijlstra wrote:
> On Thu, Aug 03, 2023 at 07:36:24PM +0800, Tiezhu Yang wrote:
> 
> > >                         ".long " __stringify_label(c) "b - .\n\t"          \
> 
> > I discussed offline with the engineers who are familiar with gnu
> > assembler of LoongArch, maybe it can modify the gnu assembler
> > to use R_LARCH_32_PCREL to replace a pair of R_LARCH_ADD32 and
> > R_LARCH_SUB32, then I will test it again and drop this change if
> > possible.

Hmm, but I don't like the idea to disallow users having GAS <= 2.41 from
using ORC unwinder.

Can we emit the R_LARCH_32_PCREL reloc with an explicit .reloc
directive?

> Yes, this is exactly what PC relative relocations are for.


-- 
Xi Ruoyao <xry111@...111.site>
School of Aerospace Science and Technology, Xidian University