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From: Mark Wielaard <mark@klomp.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Tony Ambardar <tony.ambardar@gmail.com>,
	Mark Wielaard <mjw@redhat.com>,
	Hengqi Chen <hengqi.chen@gmail.com>,
	bpf@vger.kernel.org, dwarves@vger.kernel.org,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Andrii Nakryiko <andrii@kernel.org>
Subject: Re: elfutils DWARF problem was: Re: Problem with BTF generation on mips64el
Date: Mon, 3 Jun 2024 21:18:33 +0200	[thread overview]
Message-ID: <20240603191833.GD4421@gnu.wildebeest.org> (raw)
In-Reply-To: <Zl4AHfG6Gg5Htdgc@x1>

Hi,

On Mon, Jun 03, 2024 at 02:40:45PM -0300, Arnaldo Carvalho de Melo wrote:
> Couldn't find a way to ask eu-readelf for more verbose output, where we
> could perhaps get some clue as to why it produces nothing while binutils
> readelf manages to grok it, Mark, do you know some other way to ask
> eu-readelf to produce more debug output?
> 
> I'm unsure if the netdevsim.ko file was left in a semi encoded BTF state
> that then made eu-readelf to not be able to process it while pahole,
> that uses eltuils' libraries, was able to process the first two CUs for
> a kernel module and all the CUs for the vmlinux file :-\

I haven't looked at the vmlinux file. But for the .ko file the issue
is that the elfutils MIPS backend isn't complete. Specifically MIPS
relocations aren't recognized (and so cannot be applied). There are
some pending patches which try to fix that:

https://patchwork.sourceware.org/project/elfutils/list/?series=31601

Cheers,

Mark

  reply	other threads:[~2024-06-03 19:27 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-05-31  1:30 Problem with BTF generation on mips64el Tony Ambardar
2024-05-31  2:17 ` Hengqi Chen
2024-05-31  8:13   ` Jiri Olsa
2024-05-31 11:36     ` Tony Ambardar
2024-05-31 14:21       ` Jiri Olsa
2024-06-03  9:02         ` Tony Ambardar
2024-06-03  9:18           ` Jiri Olsa
2024-06-03 12:16           ` [PATCH bpf v1 0/2] bpf: Fix linker optimization removing kfuncs Tony Ambardar
2024-06-03 12:16             ` [PATCH bpf v1 1/2] Compiler Attributes: Add __retain macro Tony Ambardar
2024-06-03 13:57               ` Miguel Ojeda
2024-06-04  2:37                 ` Tony Ambardar
2024-06-03 12:16             ` [PATCH bpf v1 2/2] bpf: Harden __bpf_kfunc tag against linker kfunc removal Tony Ambardar
2024-06-04  5:23             ` [PATCH bpf v2 0/2] bpf: Fix linker optimization removing kfuncs Tony Ambardar
2024-06-04  5:23               ` [PATCH bpf v2 1/2] compiler_types.h: Define __retain for __attribute__((__retain__)) Tony Ambardar
2024-06-05  5:55                 ` Yonghong Song
2024-06-10 22:56                   ` Tony Ambardar
2024-06-14 18:47                     ` Yonghong Song
2024-06-15  6:57                       ` Tony Ambardar
2024-06-17  3:26                         ` Yonghong Song
2024-06-04  5:23               ` [PATCH bpf v2 2/2] bpf: Harden __bpf_kfunc tag against linker kfunc removal Tony Ambardar
2024-06-04  7:56                 ` Jiri Olsa
2024-06-25 10:46                 ` Geert Uytterhoeven
2024-06-26  9:52                   ` Jiri Olsa
2024-06-26 11:40                     ` Geert Uytterhoeven
2024-06-14 17:20               ` [PATCH bpf v2 0/2] bpf: Fix linker optimization removing kfuncs patchwork-bot+netdevbpf
2024-05-31 10:49   ` Problem with BTF generation on mips64el Tony Ambardar
2024-05-31 16:06     ` Arnaldo Carvalho de Melo
2024-05-31 21:46       ` Tony Ambardar
2024-06-03 11:20       ` Tony Ambardar
2024-06-03 14:56         ` Arnaldo Carvalho de Melo
2024-06-03 17:40           ` elfutils DWARF problem was: " Arnaldo Carvalho de Melo
2024-06-03 19:18             ` Mark Wielaard [this message]
2024-06-04  3:47               ` Tony Ambardar
2024-06-04  8:27                 ` Ying Huang
2024-06-11  6:36                 ` Tony Ambardar
2024-06-11  7:51                   ` Tony Ambardar
2024-06-11 13:07                   ` Mark Wielaard
2024-06-12  0:18                     ` Tony Ambardar
2024-06-12  3:31                     ` Ying Huang
2024-06-12  2:39                   ` Ying Huang

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