linux-kernel - Re: [RFC PATCH 4/4] objtool/powerpc: Add --mcount specific implementation

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Date:   Thu, 16 Jun 2022 15:57:51 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Sathvika Vasireddy <sv@...ux.vnet.ibm.com>,
        "aik@...abs.ru" <aik@...abs.ru>,
        Chen Zhongjin <chenzhongjin@...wei.com>,
        "jpoimboe@...hat.com" <jpoimboe@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "mbenes@...e.cz" <mbenes@...e.cz>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        Sathvika Vasireddy <sv@...ux.ibm.com>
Subject: Re: [RFC PATCH 4/4] objtool/powerpc: Add --mcount specific
 implementation

On Thu, Jun 16, 2022 at 01:40:34PM +0000, Christophe Leroy wrote:
> sizeof(u64) is always 8 by definition.
> 
> So if size is 8 we are working on a binary file for a 64 bits target, if 
> not it means we are working for a 32 bits target.

Cross-builds invalidate this I think. Best to look at something like:

  elf->ehdr.e_ident[EI_CLASS] == ELFCLASS32