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Message-ID: <356384d7-d14f-2c9d-1c13-3d96e75e1727@siemens.com>
Date: Tue, 15 Oct 2019 17:21:16 +0200
From: Jan Kiszka <jan.kiszka@...mens.com>
To: Ilya Leoshkevich <iii@...ux.ibm.com>,
Kieran Bingham <kbingham@...nel.org>,
linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Cc: Heiko Carstens <heiko.carstens@...ibm.com>,
Vasily Gorbik <gor@...ux.ibm.com>
Subject: Re: [PATCH] scripts/gdb: fix debugging modules on s390
On 15.10.19 12:53, Ilya Leoshkevich wrote:
> Currently lx-symbols assumes that module text is always located at
> module->core_layout->base, but s390 uses the following layout:
>
> +------+ <- module->core_layout->base
> | GOT |
> +------+ <- module->core_layout->base + module->arch->plt_offset
> | PLT |
> +------+ <- module->core_layout->base + module->arch->plt_offset +
> | TEXT | module->arch->plt_size
> +------+
>
> Therefore, when trying to debug modules on s390, all the symbol
> addresses are skewed by plt_offset + plt_size.
>
> Fix by adding plt_offset + plt_size to module_addr in
> load_module_symbols().
>
> Signed-off-by: Ilya Leoshkevich <iii@...ux.ibm.com>
> ---
> scripts/gdb/linux/symbols.py | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/scripts/gdb/linux/symbols.py b/scripts/gdb/linux/symbols.py
> index f0d8f2ecfde7..41c6d1a55b03 100644
> --- a/scripts/gdb/linux/symbols.py
> +++ b/scripts/gdb/linux/symbols.py
> @@ -15,7 +15,7 @@ import gdb
> import os
> import re
>
> -from linux import modules
> +from linux import modules, utils
>
>
> if hasattr(gdb, 'Breakpoint'):
> @@ -113,6 +113,12 @@ lx-symbols command."""
> if module_file:
> gdb.write("loading @{addr}: {filename}\n".format(
> addr=module_addr, filename=module_file))
> + if utils.is_target_arch('s390'):
> + # Module text is preceded by PLT stubs on s390.
> + module_arch = module['arch']
> + plt_offset = int(module_arch['plt_offset'])
> + plt_size = int(module_arch['plt_size'])
> + module_addr = hex(int(module_addr, 0) + plt_offset + plt_size)
Shouldn't we report the actual address above, ie. reorder this tuning
with the gdb.write?
> cmdline = "add-symbol-file {filename} {addr}{sections}".format(
> filename=module_file,
> addr=module_addr,
>
Jan
--
Siemens AG, Corporate Technology, CT RDA IOT SES-DE
Corporate Competence Center Embedded Linux
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