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From: Tom Tromey <>
To: Pedro Alves <>
Cc: Tom Tromey <>,  Eli Zaretskii <>,
Subject: Re: [PATCH v2] Update the 'g' packet documentation
Date: Thu, 16 Feb 2023 11:16:31 -0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <> (Pedro Alves's message of "Thu, 16 Feb 2023 17:10:38 +0000")

>>>>> "Pedro" == Pedro Alves <> writes:

>> While I agree with that, it's also the case that tdep code can reject
>> such a description, and we ran into a case like this in the wild --
>> where a gdbserver does not report a register, causing i386-tdep to
>> reject the description.  However, at one point AdaCore had a port for
>> this target, and that port reported the register but sent back 'x' --
>> which worked.

Pedro> Curious.  It sounds like we made some register in a tdesc feature
Pedro> mandatory, even after the tdesc feature existed in previous
Pedro> releases?  That shouldn't have happened.

No, we are in the clear, what happened is that a vendor out there hacked
gdbserver to drop a register (the x86 "fop" register) for reasons we do
not know.  They also hacked their gdb to accept this.

AdaCore also had a patch for this target's gdbserver to not supply "fop"
(the kernel, mysteriously, does not make it available) -- but did not
change the XML or gdb, instead having the register report as


      reply	other threads:[~2023-02-16 18:16 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-11 18:37 [PATCH] " Tom Tromey
2023-01-11 19:56 ` Eli Zaretskii
2023-01-13 12:09 ` Pedro Alves
2023-01-13 18:58   ` Tom Tromey
2023-01-27 15:25     ` [PATCH v2] " Pedro Alves
2023-01-27 16:15       ` Eli Zaretskii
2023-01-30 21:15       ` Tom Tromey
2023-02-16 17:10         ` Pedro Alves
2023-02-16 18:16           ` Tom Tromey [this message]

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