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Date: Wed, 9 Mar 2011 05:39:49 +0100 (CET)
Subject: Re: RFC: x86: kill binutils 2.16.x?
From: "Segher Boessenkool" <segher@kernel.crashing.org>
To: "Kyle Moffett" <kyle@moffetthome.net>
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Cc: Andrew Morton <akpm@linux-foundation.org>,
	linux-kbuild <linux-kbuild@vger.kernel.org>,
	Kumar Gala <kumar.gala@freescale.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Kyle Moffett <kyle.d.moffett@boeing.com>,
	"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@elte.hu>,
	linuxppc-dev@lists.ozlabs.org, Thomas Gleixner <tglx@linutronix.de>
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> The problem is not with the kernel compile itself, but with the 2.12
> "dssall" binutils test.  Basically, recent binutils treats e500 as
> effectively a separate architecture that happens to share *most* of
> the opcodes with regular PowerPC.  Any opcode which is not understood
> by the e500 chip is either convert to an equivalent opcode which is
> understood (IE: lwsync => sync), or failed with an error.  This means
> that the kernel compile aborts early telling me to upgrade to a newer
> version of binutils.

$ echo dssall | powerpc-linux-as -many -me500
$ powerpc-linux-objdump -d a.out | grep 0:
   0:   7e 00 06 6c     dssall
$ powerpc-linux-as --version | head -1
GNU assembler (GNU Binutils) 2.21.51.20110309


What version of binutils does not work?  (I also checked with
-me500x2, -me500mc, -mspe, and various combinations.  lwsync
is indeed converted to a regular sync (well, "msync") for e500
and e500x2).


Segher