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docs: Document how to use gdb with unix sockets 

With gdb 9.0 and better it is possible to connect to a gdbstub
over unix sockets, which is better than a TCP socket connection
in some situations. The QEMU command line to set this up is
non-obvious; document it.

Signed-off-by: Sebastian Meyer <meyer@absint.com>
Message-id: 162867284829.27377.4784930719350564918-0@git.sr.ht
[PMM: Tweaked commit message; adjusted wording in a couple of
places; fixed rST formatting issue; moved section up out of
the 'advanced debugging options' subsection]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Sebastian Meyer 2021-08-10 18:04:36 +02:00 committed by Peter Maydell
parent 6f287c700c
commit 24b1a6aa43
1 changed files with 25 additions and 1 deletions
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docs/system/gdb.rst
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@ -15,7 +15,8 @@ The ``-s`` option will make QEMU listen for an incoming connection
from gdb on TCP port 1234, and ``-S`` will make QEMU not start the
guest until you tell it to from gdb. (If you want to specify which
TCP port to use or to use something other than TCP for the gdbstub
connection, use the ``-gdb dev`` option instead of ``-s``.)
connection, use the ``-gdb dev`` option instead of ``-s``. See
`Using unix sockets`_ for an example.)
.. parsed-literal::
@ -100,6 +101,29 @@ not just those in the cluster you are currently working on::
(gdb) set schedule-multiple on
Using unix sockets
==================
An alternate method for connecting gdb to the QEMU gdbstub is to use
a unix socket (if supported by your operating system). This is useful when
running several tests in parallel, or if you do not have a known free TCP
port (e.g. when running automated tests).
First create a chardev with the appropriate options, then
instruct the gdbserver to use that device:
.. parsed-literal::
|qemu_system| -chardev socket,path=/tmp/gdb-socket,server=on,wait=off,id=gdb0 -gdb chardev:gdb0 -S ...
Start gdb as before, but this time connect using the path to
the socket::
(gdb) target remote /tmp/gdb-socket
Note that to use a unix socket for the connection you will need
gdb version 9.0 or newer.
Advanced debugging options
==========================