From: Thorsten Glaser <tg@debian.org>
To: Linus Torvalds <torvalds@linuxfoundation.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
Peter Zijlstra <peterz@infradead.org>,
x86@kernel.org, rostedt@goodmis.org,
linux-kernel@vger.kernel.org, linux-toolchains@vger.kernel.org,
jpoimboe@redhat.com, alexei.starovoitov@gmail.com,
mhiramat@kernel.org
Subject: disassemblers (was Re: [PATCH 1/2] x86: Remove dynamic NOP selection)
Date: Sat, 20 Jan 2024 18:21:43 +0000 (UTC) [thread overview]
Message-ID: <Pine.BSM.4.64L.2401201816560.29203@herc.mirbsd.org> (raw)
In-Reply-To: <Pine.BSM.4.64L.2401201711130.29203@herc.mirbsd.org>
Dixi quod…
>>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 have searched through my bookmarks and found “Agner Fog’s objconv”
https://www.agner.org/optimize/#objconv which I had not yet tried as
it comes with a .exe but apparently, the included GPL source builds
on GNU/Linux (and BSD and MacOSX) as well.
Usage is: ./objconv -fgasm filename.o
This will write filename.asm ⚠ into the same directory as the .o file,
surprisingly.
It works for i386 and amd64 but not x32 (aka amd64ilp32) which is
mis-disassembled as if it were i386. Sample output fragment:
tsv_header:
sub rsp, 8 # 00E3 _ 48: 83. EC, 08
lea rdi, [.LC7+rip] # 00E7 _ 48: 8D. 3D, 00000000(rel)
call puts@PLT # 00EE _ E8, 00000000(PLT r)
add rsp, 8 # 00F3 _ 48: 83. C4, 08
ret # 00F7 _ C3
Bit irritating is it uses decimal numbers…
sub rsp, 232 # 0102 _ 48: 81. EC, 000000E8
… and the way the input is separated with colon, period and comma,
but it’s legible enough.
Credits to Peter Cordes for the discovery.
bye,
//mirabilos
--
When he found out that the m68k port was in a pretty bad shape, he did
not, like many before him, shrug and move on; instead, he took it upon
himself to start compiling things, just so he could compile his shell.
How's that for dedication. -- Wouter, about my Debian/m68k revival
next prev parent reply other threads:[~2024-01-20 18:22 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-12 11:32 [PATCH 0/2] x86: Remove ideal_nops[] Peter Zijlstra
2021-03-12 11:32 ` [PATCH 1/2] x86: Remove dynamic NOP selection Peter Zijlstra
2021-03-12 12:09 ` Peter Zijlstra
2021-03-12 20:36 ` Linus Torvalds
2024-01-20 6:58 ` Thorsten Glaser
2024-01-20 8:22 ` H. Peter Anvin
2024-01-20 16:53 ` Thorsten Glaser
2024-01-21 23:21 ` H. Peter Anvin
2024-01-21 23:58 ` Thorsten Glaser
2024-01-22 0:15 ` H. Peter Anvin
2024-01-22 0:56 ` Steven Rostedt
2024-01-22 1:17 ` Thorsten Glaser
2024-01-22 2:04 ` H. Peter Anvin
2024-01-22 2:15 ` H. Peter Anvin
2024-01-22 2:22 ` Steven Rostedt
2024-01-22 2:31 ` H. Peter Anvin
2024-01-20 17:00 ` Linus Torvalds
2024-01-20 17:19 ` Thorsten Glaser
2024-01-20 18:21 ` Thorsten Glaser [this message]
2024-01-21 22:36 ` David Laight
2024-01-21 23:10 ` H. Peter Anvin
2021-03-12 11:32 ` [PATCH 2/2] objtool,x86: Use asm/nops.h Peter Zijlstra
2021-03-12 14:29 ` [PATCH 0/2] x86: Remove ideal_nops[] Sedat Dilek
2021-03-12 14:47 ` Borislav Petkov
2021-03-12 17:26 ` Steven Rostedt
2021-03-12 17:35 ` Sedat Dilek
2021-03-12 17:46 ` Borislav Petkov
2021-03-12 17:47 ` Steven Rostedt
2021-03-12 18:13 ` Sedat Dilek
2021-03-12 19:03 ` Sedat Dilek
2021-03-12 20:59 ` Borislav Petkov
[not found] ` <CA+icZUWSCS6vAQOXoG6nsW+Dbnogivzf+rmegCTMjz5hjE5cKQ@mail.gmail.com>
2021-03-13 8:49 ` Borislav Petkov
2021-03-13 11:23 ` Borislav Petkov
2021-03-13 12:10 ` Sedat Dilek
2021-03-13 12:15 ` Borislav Petkov
2021-03-13 12:38 ` Sedat Dilek
2021-03-13 12:49 ` Borislav Petkov
2021-03-13 12:58 ` Sedat Dilek
2021-03-13 13:29 ` Borislav Petkov
2021-03-13 13:47 ` Sedat Dilek
2021-03-15 17:04 ` Sedat Dilek
2021-03-15 17:15 ` Borislav Petkov
2021-03-15 17:19 ` Sedat Dilek
2021-03-15 17:23 ` Borislav Petkov
2021-03-15 18:10 ` Peter Zijlstra
2021-03-15 18:23 ` Sedat Dilek
2021-03-15 22:14 ` Peter Zijlstra
2021-03-16 5:56 ` Sedat Dilek
2021-03-27 12:08 ` Sedat Dilek
2021-03-27 20:02 ` Linus Torvalds
2021-03-30 12:31 ` Sedat Dilek
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