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@xxxxxxxxxxxxx>
> AuthorDate: Fri, 26 Feb 2021 11:32:30 +01:00
> Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> 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
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