linux-kernel - Re: [PATCH 1/2] x86: Remove dynamic NOP selection

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Date: Sat, 20 Jan 2024 17:19:16 +0000 (UTC)
From: Thorsten Glaser <tg@...ian.org>
To: Linus Torvalds <torvalds@...uxfoundation.org>
cc: "H. Peter Anvin" <hpa@...or.com>, Peter Zijlstra <peterz@...radead.org>,
        x86@...nel.org, rostedt@...dmis.org, linux-kernel@...r.kernel.org,
        linux-toolchains@...r.kernel.org, jpoimboe@...hat.com,
        alexei.starovoitov@...il.com, mhiramat@...nel.org
Subject: Re: [PATCH 1/2] x86: Remove dynamic NOP selection

Linus Torvalds dixit:

>On that note, does anybody have a better disassembler than objdump? Or
>even a script around it to make it more useful? I do use "objdump
>--disassemble" a fair amount, and I hate how bad it is.

Other than -Mintel (and -Mintel,i8086 for boot code) to make the
syntax 90–95% less awful, I’m sorry I’ve also been looking.

>My pet peeve is the crazy relocation handling (or lack there-of). IOW,

Yes! This!

I’ve been putting markers into the file and then disassembling
the final linked thing instead of just the object file I need
because of this.

>Is there some sane tool that just does the sane thing and shows this as

The only other disassemblers I know don’t know about ELF objects
at all, I’m sorry to say.

I didn’t know about objdump -r, but that’s truly awful to read.
Given a wide enough screen, an intermediate | sed 's/^\t/&&&&/'
at least moves the relocation info more to the right to interrupt
the reading flow less.

Thanks,
//mirabilos
-- 
FWIW, I'm quite impressed with mksh interactively. I thought it was much
*much* more bare bones. But it turns out it beats the living hell out of
ksh93 in that respect. I'd even consider it for my daily use if I hadn't
wasted half my life on my zsh setup. :-) -- Frank Terbeck in #!/bin/mksh