linux-kernel - Re: [PATCH v2 8/8] LoongArch: Add ORC unwinder support

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Date:   Tue, 17 Oct 2023 20:39:28 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Jinyang He <hejinyang@...ngson.cn>,
        Huacai Chen <chenhuacai@...nel.org>
Cc:     Josh Poimboeuf <jpoimboe@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org,
        loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH v2 8/8] LoongArch: Add ORC unwinder support



On 10/15/2023 08:57 PM, Jinyang He wrote:
> On 2023-10-14 19:37, Huacai Chen wrote:

...

>
> Hi, Tiezhu,
>
> We can think the jirl with link register is a call instruction.
> loongarch_suspend_enter:
>     jirl   a0, t0, 0 /* Call BIOS's STR sleep routine */
> Its link register is a0, (not ra), we also think it is a call
> instruction. The func is also stack banlaced. So the func can be a
> regular function.

Yes, thank you, I will modify jirl decoder to handle this special case
in hibernate_asm.o.

Thanks,
Tiezhu