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Date:   Mon, 11 Jul 2022 11:14:42 -0500
From:   Segher Boessenkool <segher@kernel.crashing.org>
To:     Christophe Leroy <christophe.leroy@csgroup.eu>
Cc:     Arnd Bergmann <arnd@arndb.de>,
        Pali =?iso-8859-1?Q?Roh=E1r?= <pali@kernel.org>,
        Michael Ellerman <michael@ellerman.id.au>,
        linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] powerpc: e500: Fix compilation with gcc e500 compiler
Message-ID: <20220711161442.GD25951@gate.crashing.org>
References: <20220524093939.30927-1-pali@kernel.org> <20220702094405.tp7eo4df7fjvn2ng@pali> <8D562851-304F-4153-9194-426CC22B7FF2@ellerman.id.au> <20220704103951.nm4m4kpgnus3ucqo@pali> <CAK8P3a2tdny8SA7jcqhUZT13iq1mYqjFueC-gnTUZA1JKCtfgg@mail.gmail.com> <20220708171227.74nbcgsk63y4bdna@pali> <CAK8P3a3YMqGEjRr+ZD4Enm4pnuNNZOaeXqpY=PDXAP7w3P7y4A@mail.gmail.com> <d9339bb9-2410-bea5-7502-1c7839707f4e@csgroup.eu>
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On Sat, Jul 09, 2022 at 09:26:11AM +0000, Christophe Leroy wrote:
> If I select the GENERIC_CPU or e5500 (with altivec) I get:
> 
>    CC      arch/powerpc/kernel/irq.o
> {standard input}: Assembler messages:
> {standard input}:3535: Error: unrecognized opcode: `wrteei'
> {standard input}:5608: Error: unrecognized opcode: `wrteei'

What -mcpu= did it use here?

wrteei is not a PowerPC insn (it is BookE, instead), so it is not
recognised without an appropriate -mcpu=.

> If I select the e5500 (without altivec) or e6500 I get:
> 
>    CC      arch/powerpc/kernel/io.o
> {standard input}: Assembler messages:
> {standard input}:381: Error: unrecognized opcode: `eieio'

Same question.  eieio is a base PowerPC instruction, so this one is
"interesting" :-)


Segher