linux-kernel - Re: [tip: objtool/core] objtool: Parse options from OBJTOOL

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Message-ID: <YEDqytNoqAMj1M+T@hirez.programming.kicks-ass.net>
Date:   Thu, 4 Mar 2021 15:12:26 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     linux-tip-commits@...r.kernel.org, Borislav Petkov <bp@...en8.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>, x86@...nel.org
Subject: Re: [tip: objtool/core] objtool: Parse options from OBJTOOL_ARGS

On Wed, Mar 03, 2021 at 08:45:31AM -0000, tip-bot2 for Peter Zijlstra wrote:
> The following commit has been merged into the objtool/core branch of tip:
> 
> Commit-ID:     b52eb21aeca75790869c26b91b1d7b80b3946430
> Gitweb:        https://git.kernel.org/tip/b52eb21aeca75790869c26b91b1d7b80b3946430
> Author:        Peter Zijlstra <peterz@...radead.org>
> AuthorDate:    Fri, 26 Feb 2021 11:32:30 +01:00
> Committer:     Peter Zijlstra <peterz@...radead.org>
> CommitterDate: Wed, 03 Mar 2021 09:38:32 +01:00
> 
> objtool: Parse options from OBJTOOL_ARGS
> 
> Teach objtool to parse options from the OBJTOOL_ARGS environment
> variable.
> 
> This enables things like:
> 
>   $ OBJTOOL_ARGS="--backup" make O=defconfig-build/ kernel/ponies.o
> 
> to obtain both defconfig-build/kernel/ponies.o{,.orig} and easily
> inspect what objtool actually did.

Latest objdiff.sh to go with this:

$ cat objdiff.sh
#!/bin/bash

name=$1
pre=${name}.orig
post=${name}

function to_text {
	obj=$1
	( objdump -wdr $obj;
	  readelf -W --relocs --symbols $obj |
		  awk '/^Relocation section/ { $6=0 } { print $0 }'
	) > ${obj}.tmp
}

to_text $pre
to_text $post

diff -u ${pre}.tmp ${post}.tmp

rm ${pre}.tmp ${post}.tmp