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References: <20210109171058.497636-1-alobakin@pm.me> <CAKwvOdmV2tj4Uyz1iDkqCj+snWPpnnAmxJyN+puL33EpMRPzUw@mail.gmail.com>
 <20210109191457.786517-1-alobakin@pm.me> <CAKwvOdnOXXaz+S1agu5kCQLm+qEkXE2Hpd2_V8yPsbUTQH7JZw@mail.gmail.com>
 <20210111204936.17905-1-alobakin@pm.me>
In-Reply-To: <20210111204936.17905-1-alobakin@pm.me>
From:   Nick Desaulniers <ndesaulniers@google.com>
Date:   Tue, 12 Jan 2021 14:14:58 -0800
Message-ID: <CAKwvOdnvd1NaBQEJ0fPsYiGff4=tUdrcuAR0no9FUMqnOZSu6Q@mail.gmail.com>
Subject: Re: [BUG mips llvm] MIPS: malformed R_MIPS_{HI16,LO16} with LLVM
To:     Alexander Lobakin <alobakin@pm.me>
Cc:     Fangrui Song <maskray@google.com>,
        clang-built-linux <clang-built-linux@googlegroups.com>,
        linux-mips@vger.kernel.org,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        Ralf Baechle <ralf@linux-mips.org>,
        LKML <linux-kernel@vger.kernel.org>,
        linux-arch <linux-arch@vger.kernel.org>
Content-Type: multipart/mixed; boundary="0000000000001150b305b8bb5be1"
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On Mon, Jan 11, 2021 at 12:50 PM Alexander Lobakin <alobakin@pm.me> wrote:
>
> > The disassembly for me produces:
> >     399c: 3c 03 00 00   lui     $3, 0 <phy_device_free>
> >                         0000399c:  R_MIPS_HI16  .text
> > ...
> >     39a8: 24 63 3a 5c   addiu   $3, $3, 14940 <phy_probe>
> >                         000039a8:  R_MIPS_LO16  .text
>
> So, in your case the values of the instructions that relocs refer are:
>
> 0x3c030000 R_MIPS_HI16
> 0x24633a5c R_MIPS_LO16
>
> Mine were:
>
> 0x3c010000
> 0x24339444
>
> Your second one doesn't have bit 15 set, so I think this pair won't
> break the code.
> Try to hunt for R_MIPS_LO16 that have this bit set, i.e. they have
> '8', '9', 'a', 'b', 'c', 'd' or 'e' as their [15:12].

I don't think any of my R_MIPS_LO16 in that file have that bit set.
See attached.
-- 
Thanks,
~Nick Desaulniers

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