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Re: [PATCH] ARM: disallow ARM_THUMB for ARMv4 builds

From Arnd Bergmann <arnd@arndb.de>
Newsgroups linux.kernel
Subject Re: [PATCH] ARM: disallow ARM_THUMB for ARMv4 builds
Date 2016-12-16 23:00 +0100
Message-ID <sP8HL-FW-3@gated-at.bofh.it> (permalink)
References <sOWZY-1DO-33@gated-at.bofh.it> <sP4ut-6D6-13@gated-at.bofh.it>
Organization linux.* mail to news gateway

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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

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Thread

[PATCH] ARM: disallow ARM_THUMB for ARMv4 builds Arnd Bergmann <arnd@arndb.de> - 2016-12-16 10:30 +0100
  Re: [PATCH] ARM: disallow ARM_THUMB for ARMv4 builds Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2016-12-16 18:30 +0100
    Re: [PATCH] ARM: disallow ARM_THUMB for ARMv4 builds Arnd Bergmann <arnd@arndb.de> - 2016-12-16 23:00 +0100
      Re: [PATCH] ARM: disallow ARM_THUMB for ARMv4 builds Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2016-12-18 13:00 +0100
        Re: [PATCH] ARM: disallow ARM_THUMB for ARMv4 builds Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-12-18 15:20 +0100
          Re: [PATCH] ARM: disallow ARM_THUMB for ARMv4 builds Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2016-12-18 16:10 +0100
            Re: [PATCH] ARM: disallow ARM_THUMB for ARMv4 builds Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-12-19 00:50 +0100
              Re: [PATCH] ARM: disallow ARM_THUMB for ARMv4 builds Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-12-19 05:20 +0100

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