From: Alexei Starovoitov <ast@plumgrid.com>
To: He Kuang <hekuang@huawei.com>,
"Wangnan (F)" <wangnan0@huawei.com>, pi3orama <pi3orama@163.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: llvm bpf debug info. Re: [RFC PATCH v4 3/3] bpf: Introduce function for outputing data to perf event
Date: Mon, 27 Jul 2015 19:18:45 -0700 [thread overview]
Message-ID: <55B6E685.30905@plumgrid.com> (raw)
In-Reply-To: <55B35F42.70803@huawei.com>
On 7/25/15 3:04 AM, He Kuang wrote:
> I noticed that for 64-bit elf format, the reloc sections have
> 'Addend' in the entry, but there's no 'Addend' info in bpf elf
> file(64bit). I think there must be something wrong in the process
> of .s -> .o, which related to 64bit/32bit. Anyway, we can parse out the
> AT_name now, DW_AT_LOCATION still missed and need your help.
looks like objdump/llvm-dwarfdump can only read known EM,
but that that shouldn't be the problem for your dwarf reader right?
It should be able to recognize id-s of ELF::R_X86_64_* relo used right?
As far as AT_location for testprog.c it seems there is no info for
local variables because they were optimized away.
With -O0 I see AT_location being emitted.
Also line number info seems to be good in both cases.
But in our case, we don't need this anyway, no? we need to see
the types of structs mainly or you have some other use cases?
I think line number info would be great to correlate the error reported
by verifier into specific line in C.
next prev parent reply other threads:[~2015-07-28 2:18 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-10 10:03 [RFC PATCH v4 0/3] Make eBPF programs output data to perf event He Kuang
2015-07-10 10:03 ` [RFC PATCH v4 1/3] tracing/events: Fix wrong sample output by storing array length instead of size He Kuang
2015-07-17 14:32 ` Steven Rostedt
2015-07-17 17:24 ` Sara Rostedt
2015-07-17 18:13 ` Steven Rostedt
2015-07-23 19:36 ` Alex Bennée
2015-07-10 10:03 ` [RFC PATCH v4 2/3] tools lib traceevent: Add function to get dynamic arrays length He Kuang
2015-07-10 10:03 ` [RFC PATCH v4 3/3] bpf: Introduce function for outputing data to perf event He Kuang
2015-07-10 22:10 ` Alexei Starovoitov
2015-07-13 4:36 ` He Kuang
2015-07-13 13:52 ` Namhyung Kim
2015-07-13 14:01 ` pi3orama
2015-07-13 14:09 ` Namhyung Kim
2015-07-13 14:29 ` pi3orama
2015-07-14 1:43 ` Alexei Starovoitov
2015-07-14 11:54 ` He Kuang
2015-07-17 4:11 ` Alexei Starovoitov
2015-07-17 4:14 ` Wangnan (F)
2015-07-17 4:27 ` Alexei Starovoitov
2015-07-23 11:54 ` He Kuang
2015-07-23 20:49 ` llvm bpf debug info. " Alexei Starovoitov
2015-07-24 3:20 ` Alexei Starovoitov
2015-07-24 4:16 ` He Kuang
2015-07-25 10:04 ` He Kuang
2015-07-28 2:18 ` Alexei Starovoitov [this message]
2015-07-29 9:38 ` He Kuang
2015-07-29 17:13 ` Alexei Starovoitov
2015-07-29 20:00 ` pi3orama
2015-07-29 22:20 ` Alexei Starovoitov
2015-07-31 10:18 ` Wangnan (F)
2015-07-31 10:20 ` [LLVM PATCH] BPF: add FRAMEADDR support Wang Nan
2015-07-31 10:21 ` [LLVM CLANG PATCH] BPF: add __builtin_bpf_typeid() Wang Nan
2015-07-31 10:48 ` llvm bpf debug info. Re: [RFC PATCH v4 3/3] bpf: Introduce function for outputing data to perf event pi3orama
2015-08-03 19:44 ` Alexei Starovoitov
2015-08-04 9:01 ` Cc llvmdev: " Wangnan (F)
2015-08-05 1:58 ` Wangnan (F)
2015-08-05 2:05 ` Wangnan (F)
2015-08-05 6:51 ` [LLVMdev] " Wangnan (F)
2015-08-05 7:11 ` Alexei Starovoitov
2015-08-05 8:28 ` Wangnan (F)
2015-08-06 3:22 ` [llvm-dev] " Alexei Starovoitov
2015-08-06 4:35 ` Wangnan (F)
2015-08-06 6:55 ` Alexei Starovoitov
2015-08-12 2:34 ` Wangnan (F)
2015-08-12 4:57 ` [llvm-dev] " Alexei Starovoitov
2015-08-12 5:28 ` Wangnan (F)
2015-08-12 13:15 ` Brenden Blanco
2015-08-13 6:24 ` Wangnan (F)
2015-08-05 8:59 ` [LLVMdev] Cc llvmdev: " He Kuang
2015-08-06 3:41 ` [llvm-dev] " Alexei Starovoitov
2015-08-06 4:31 ` Wangnan (F)
2015-08-06 6:50 ` Alexei Starovoitov
2015-07-13 8:29 ` Peter Zijlstra
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=55B6E685.30905@plumgrid.com \
--to=ast@plumgrid.com \
--cc=hekuang@huawei.com \
--cc=linux-kernel@vger.kernel.org \
--cc=pi3orama@163.com \
--cc=wangnan0@huawei.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.