linux-kernel - Re: [PATCH v4 2/5] LoongArch: Use la.pcrel instead of la.abs for exception handlers

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Message-ID: <48c4b1f81c21950e9fd46d4acb5196d979b147cb.camel@xry111.site>
Date:   Thu, 16 Feb 2023 15:10:17 +0800
From:   Xi Ruoyao <xry111@...111.site>
To:     Jinyang He <hejinyang@...ngson.cn>,
        Youling Tang <tangyouling@...ngson.cn>,
        Huacai Chen <chenhuacai@...nel.org>
Cc:     Xuerui Wang <kernel@...0n.name>, loongarch@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Xuefeng Li <lixuefeng@...ngson.cn>,
        Jianmin lv <lvjianmin@...ngson.cn>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>
Subject: Re: [PATCH v4 2/5] LoongArch: Use la.pcrel instead of la.abs for
 exception handlers

On Thu, 2023-02-16 at 14:59 +0800, Jinyang He wrote:
> +.macro la.abs reg, sym
> +766:
> +    nop
> +    nop
> +    nop
> +    nop

In the "formal" version we can code

lu12i.w		reg, 0
ori		reg, reg, 0
lu32i.d		reg, 0
lu52i.d		reg, reg, 0

here.  Then we only need to fixup the immediate slot so we can avoid
using parse_r.


> +    .pushsection ".laabs", "aw", %progbits
> +768:
> +    .word 768b-766b
> +    parse_r regno, \reg
> +    .word regno
> +    .dword \sym
> +    .popsection
> +.endm

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