From: Arnd Bergmann <arnd@arndb.de>
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Russell King <linux@armlinux.org.uk>,
Nicolas Pitre <nicolas.pitre@linaro.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Jonas Jensen <jonas.jensen@gmail.com>
Subject: Re: [PATCH] ARM: disallow ARM_THUMB for ARMv4 builds
Date: Fri, 16 Dec 2016 22:51:08 +0100 [thread overview]
Message-ID: <4112999.Nl7pxYH1YF@wuerfel> (raw)
In-Reply-To: <CAKv+Gu93Gtkh7spA-HUHNKSmDjhK_nuwR9KaDu8=S2GDyhUJCA@mail.gmail.com>
On Friday, December 16, 2016 5:20:22 PM CET Ard Biesheuvel wrote:
>
> Can't we use the old
>
> tst lr, #1
> moveq pc, lr
> bx lr
>
> trick? (where bx lr needs to be emitted as a plain opcode to hide it
> from the assembler)
>
Yes, that should work around the specific problem in theory, but back
when Jonas tried it, it still didn't work. There may also be other
problems in that configuration.
Arnd
next prev parent reply other threads:[~2016-12-16 21:51 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-16 9:14 [PATCH] ARM: disallow ARM_THUMB for ARMv4 builds Arnd Bergmann
2016-12-16 17:20 ` Ard Biesheuvel
2016-12-16 21:51 ` Arnd Bergmann [this message]
2016-12-18 11:57 ` Ard Biesheuvel
2016-12-18 14:16 ` Russell King - ARM Linux
2016-12-18 15:04 ` Ard Biesheuvel
2016-12-18 23:40 ` Russell King - ARM Linux
2016-12-19 4:10 ` Nicolas Pitre
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