Date: Wed, 22 Jun 2011 09:39:08 -0600 From: Warner Losh <imp@bsdimp.com> To: Damjan Marion <damjan.marion@gmail.com> Cc: toolchain@freebsd.org Subject: Re: ARM issue with old binutils Message-ID: <744CFC2C-0F17-4AED-A54A-FC93EB885FAD@bsdimp.com> In-Reply-To: <0C35FE0F-3301-44C6-AC40-233F6C446EBC@gmail.com>
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I'd be inclined to include a small patch to FreeBSD's binutils to implement this. You might be able to snag it from a newer version of binutils if you can track down the author of that code and ask if you can include it in a GPLv2 version of binutils.
Warner
On Jun 22, 2011, at 7:09 AM, Damjan Marion wrote:
>
> Hi,
>
> On my ongoing effort to support clang cross-compiling of world for ARM architecture I hit one weird issue:
>
> Problem is that old ARM Architecture Reference Manual (ARMv5) specifies mnemonics "mov r0, r0, rrx"
> while new ARM ARM defines same instruction as "rrx r0,r0".
>
> Both have same opcode: 0xe1a00060.
>
> Problem is that clang currently uses GAS to assemble files and GAS version we have (2.17.50) doesn't have a clue about new mnemonics "rrx r0,r0".
>
> I see 3 options to fix this:
>
> 1. Ask clang folks to patch llvm to use old mnemonics ("mov r0, r0, rrx" instead of "rrx r0,r0")
> 2. Maintain same patch for freebsd only
> 3. patch binutils to support this new mnemonics
>
> Any thoughts how to proceed?
>
> Thanks,
>
> Damjan
>
>
>
>
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