linux-kernel - Re: [PATCH 1/3] LoongArch: tools: Add relocs tool support

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Message-ID: <78a4a6b0970c309daa336a2329e69d28df486552.camel@xry111.site>
Date:   Sat, 03 Sep 2022 18:49:14 +0800
From:   Xi Ruoyao <xry111@...111.site>
To:     Youling Tang <tangyouling@...ngson.cn>,
        Huacai Chen <chenhuacai@...nel.org>
Cc:     linux-kernel@...r.kernel.org, loongarch@...ts.linux.dev,
        Xuerui Wang <kernel@...0n.name>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Jinyang He <hejinyang@...ngson.cn>
Subject: Re: [PATCH 1/3] LoongArch: tools: Add relocs tool support

On Sat, 2022-09-03 at 09:57 +0800, Youling Tang wrote:
> > > Unlike (pre-r6) MIPS, LoongArch has a complete support for PIC, and
> > > currently LoongArch toolchain always produces PIC (except, if -Wa,-mla-
> > > {local,global}-with-abs or la.abs macros are used explicitly).
> > > 
> > > So would it be easier to review and correct the uses of "la.abs" in the
> > > code, and make the main kernel image a real PIE?  Then we can load it
> > > everywhere w/o any need to do relocation at load time.
> 
> At the beginning I also wanted to make the main kernel image a real PIE
> and tried it, some of the "la.abs" can be modified, but I encountered
> difficulties in modifying the  exception handling code part, the kernel
> will not  boot after modification :(, I will continue to work hard try.

I just tried the same thing and get the same result :(.  Will spend
several hours reading the LoongArch manual about exception...

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