linux-kernel - Re: [PATCH 0/2] Make badr macro compatible with newer GAS versions

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Message-ID: <CAKv+Gu-RHM7HAmzWw9Ge+w21kWxKxLbJT7DD5huv-7WWOPUVWA@mail.gmail.com>
Date:   Tue, 19 Jun 2018 22:34:38 +0200
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Russell King <linux@...linux.org.uk>,
        Mark Rutland <mark.rutland@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] Make badr macro compatible with newer GAS versions

On 19 June 2018 at 22:32, Guenter Roeck <linux@...ck-us.net> wrote:
> On Tue, Jun 19, 2018 at 09:26:31PM +0200, Ard Biesheuvel wrote:
>> Work around the mindless and backward incompatible change in GAS that
>> prevents us from using a simple addition to set the Thumb bit in local
>> symbol references taken using 'adr' instructions (#2)
>>
>> As a preparatory step, remove badr occurrences in ARM code sequences
>> contained in Thumb2 kernels.
>>
>> Ard Biesheuvel (2):
>>   ARM: avoid badr macro for switching to Thumb-2 mode
>>   ARM: assembler: prevent ADR from setting the Thumb bit twice
>>
>
> This doesn't work for images built with a toolchain based on gcc 7.3.0
> and binutils 2.28.1. It _does_ work for images built with gcc 7.3.0/
> binutils 2.30.
>

Sigh.

So does it fail? Or is the resulting binary broken?