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From: Mark Wielaard <mark@klomp.org>
To: Andrii Nakryiko <andrii.nakryiko@gmail.com>,
	Jiri Olsa <jolsa@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Andrii Nakryiko <andriin@fb.com>,
	dwarves@vger.kernel.org, Networking <netdev@vger.kernel.org>,
	bpf <bpf@vger.kernel.org>, Yonghong Song <yhs@fb.com>,
	Hao Luo <haoluo@google.com>, Martin KaFai Lau <kafai@fb.com>,
	Song Liu <songliubraving@fb.com>,
	John Fastabend <john.fastabend@gmail.com>,
	KP Singh <kpsingh@chromium.org>,
	Joe Lawrence <joe.lawrence@redhat.com>
Subject: Re: [PATCH 2/3] bpf_encoder: Translate SHN_XINDEX in symbol's st_shndx values
Date: Sat, 23 Jan 2021 21:21:57 +0100	[thread overview]
Message-ID: <51de59d9a4ef0ee544772ea59aae80d50a4930b5.camel@klomp.org> (raw)
In-Reply-To: <CAEf4BzaviAOnNc31vUjWcCK7JvEwc8_nPQTiEpxMFcoTcvNw8w@mail.gmail.com>

Hi,

On Sat, 2021-01-23 at 12:07 -0800, Andrii Nakryiko wrote:
> > the latest upstream code seems to set it always,
> > but I agree we should be careful
> 
> oh, then maybe it's not necessary. I honestly don't even know where
> the authoritative source code of libelf is, so I just found some
> random source code with Google.

The elfutils.org libelf implementation can be found here:
https://sourceware.org/git/?p=elfutils.git;a=tree;f=libelf;hb=HEAD

There are some other implementations, but some aren't maintained and
others aren't packaged for any distro (anymore). libelf is a semi-
standard "SVR4 Unix" library, so you might also find it for some none
GNU/Linux OSes like Solaris. The ELF specification itself is contained
in the System V Application Binary Interface (gABI). The libelf library
itself isn't actually officially part of the specification. But we
still do try to keep the implementations (source) compatible through
the generic-abi mailinglist.

Cheers,

Mark

  reply	other threads:[~2021-01-23 20:22 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-21 20:22 [PATCHv2 0/3] dwarves,libbpf: Add support to use optional extended section index table Jiri Olsa
2021-01-21 20:22 ` [PATCH 1/3] elf_symtab: Add support for SHN_XINDEX index to elf_section_by_name Jiri Olsa
2021-01-21 23:10   ` Andrii Nakryiko
2021-01-21 23:34     ` Jiri Olsa
2021-01-21 20:22 ` [PATCH 2/3] bpf_encoder: Translate SHN_XINDEX in symbol's st_shndx values Jiri Olsa
2021-01-21 23:32   ` Andrii Nakryiko
2021-01-22  9:32     ` Jiri Olsa
2021-01-22 20:46     ` Jiri Olsa
2021-01-22 22:55       ` Andrii Nakryiko
2021-01-23 18:51         ` Jiri Olsa
2021-01-23 20:07           ` Andrii Nakryiko
2021-01-23 20:21             ` Mark Wielaard [this message]
2021-01-23 20:08           ` Mark Wielaard
2021-01-23 20:15             ` Jiri Olsa
2021-01-23 21:23     ` Jiri Olsa
2021-01-24  6:08       ` Andrii Nakryiko
2021-01-21 20:22 ` [PATCH bpf-next 3/3] libbpf: Use string table index from index table if needed Jiri Olsa
2021-01-21 23:46   ` Andrii Nakryiko
  -- strict thread matches above, loose matches on Subject: below --
2021-01-19 22:12 [PATCH 0/3] dwarves,libbpf: Add support to use optional extended section index table Jiri Olsa
2021-01-19 22:12 ` [PATCH 2/3] bpf_encoder: Translate SHN_XINDEX in symbol's st_shndx values Jiri Olsa
2021-01-20  2:03   ` Andrii Nakryiko
2021-01-20 12:25     ` Jiri Olsa

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