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Re: [Qemu-trivial] [Qemu-devel] [PATCH] linux-user: Support gdb 'qOffset

From: Laurent Vivier
Subject: Re: [Qemu-trivial] [Qemu-devel] [PATCH] linux-user: Support gdb 'qOffsets' query for ELF
Date: Mon, 26 Aug 2019 10:29:19 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0

Le 17/08/2019 à 01:34, Josh Kunz via Qemu-devel a écrit :
> This is needed to support debugging PIE ELF binaries running under QEMU
> user mode. Currently, `code_offset` and `data_offset` remain unset for
> all ELF binaries, so GDB is unable to correctly locate the position of
> the binary's text and data.
> The fields `code_offset`, and `data_offset` were originally added way
> back in 2006 to support debugging of bFMT executables (978efd6aac6),
> and support was just never added for ELF. Since non-PIE binaries are
> loaded at exactly the address specified in the binary, GDB does not need
> to relocate any symbols, so the buggy behavior is not normally observed.
> Buglink: https://bugs.launchpad.net/qemu/+bug/1528239
> Signed-off-by: Josh Kunz <address@hidden>
> ---
>  linux-user/elfload.c | 2 ++
>  1 file changed, 2 insertions(+)

As it seems they are text and data segment offsets, why it's not based
on info->start_code and info->start_data?


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