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Clarify language for the '?' packet

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Both QEMU and kgdb make the assumption that the '?' packet is only
sent during the initial setup of a gdbstub connection. Both use that
knowledge to reset breakpoints and ensure the gdbstub is in a
clean-state on a resumed connection. This can cause confusion for
others implementing clients that speak to gdbstub devices. To avoid
that make the language clearer that this is a start-up query packet
that you only expect to see once.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

gdb/doc/ChangeLog:

	* gdb.texinfo (Packets): Clarify language for ? packet.

Change-Id: Iae25d3110fe28b8d2467704962a6889e55224ca5
This commit is contained in:
Alex Bennée
2020-12-23 16:36:16 -05:00
committed by Simon Marchi
parent 279d901e5a
commit f37059ea22
2 changed files with 8 additions and 3 deletions
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4
gdb/doc/ChangeLog
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@ -1,3 +1,7 @@
2020-12-23 Alex Bennée <alex.bennee@linaro.org>
* gdb.texinfo (Packets): Clarify language for ? packet.
2020-12-21 Joel Brobecker <brobecker@adacore.com>
* gdb.texinfo (Requirements): Add GMP to list of requirements.

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gdb/doc/gdb.texinfo
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@ -39502,9 +39502,10 @@ The remote target both supports and has enabled extended mode.
@item ?
@cindex @samp{?} packet
@anchor{? packet}
Indicate the reason the target halted. The reply is the same as for
step and continue. This packet has a special interpretation when the
target is in non-stop mode; see @ref{Remote Non-Stop}.
This is sent when connection is first established to query the reason
the target halted. The reply is the same as for step and continue.
This packet has a special interpretation when the target is in
non-stop mode; see @ref{Remote Non-Stop}.
Reply:
@xref{Stop Reply Packets}, for the reply specifications.