linux-kernel - Re: RFC: x86: kill binutils 2.16.x?

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Date:	Wed, 9 Mar 2011 05:39:49 +0100 (CET)
From:	"Segher Boessenkool" <segher@...nel.crashing.org>
To:	"Kyle Moffett" <kyle@...fetthome.net>
Cc:	"Benjamin Herrenschmidt" <benh@...nel.crashing.org>,
	"Ingo Molnar" <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"linux-kbuild" <linux-kbuild@...r.kernel.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linuxppc-dev@...ts.ozlabs.org,
	"Kyle Moffett" <kyle.d.moffett@...ing.com>,
	"Kumar Gala" <kumar.gala@...escale.com>
Subject: Re: RFC: x86: kill binutils 2.16.x?

> 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

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