From: Steven Seeger <steven.seeger@flightsystems.net>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: QEMU Developers <qemu-devel@nongnu.org>,
Richard Henderson <rth@twiddle.net>,
Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>,
Artyom Tarasenko <atar4qemu@gmail.com>
Subject: Re: [Qemu-devel] [PATCH 01/02] fix issue where a branch to pc+4 confuses GDB because pc and npc are set to the same value
Date: Thu, 15 Feb 2018 22:01:13 -0500 [thread overview]
Message-ID: <1954706.4zhPn1VUeE@wirbelwind> (raw)
In-Reply-To: <CAFEAcA_xHpd5_RVp4_Be3wOa_U6YTpN0wiKheMYApuSOkbtjHw@mail.gmail.com>
All,
I think that the issue I pointed out the list is not a QEMU bug at all but a
GDB bug. GDB's sparc software single step implementation seems to be what is
stuck. It always re-sets the breakpoint at the current instruction in this
case. It calculates the breakpoint offsets by analyzing the instruction and
doesn't take this edge case into account. It does not appear to receive an
invalid npc value from QEMU as I thought it was.
Steven
prev parent reply other threads:[~2018-02-16 3:01 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-15 19:15 [Qemu-devel] [PATCH 01/02] fix issue where a branch to pc+4 confuses GDB because pc and npc are set to the same value Steven Seeger
2018-02-15 19:39 ` Peter Maydell
2018-02-15 21:03 ` Steven Seeger
2018-02-15 21:06 ` Steven Seeger
2018-02-16 3:01 ` Steven Seeger [this message]
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