From: "Eli Zaretskii" <eliz@gnu.org>
To: Johan Rydberg <jrydberg@virtutech.com>
Cc: dan@shearer.org, gdb@sources.redhat.com
Subject: Re: [discuss] Support for reverse-execution
Date: Fri, 20 May 2005 14:12:00 -0000 [thread overview]
Message-ID: <01c55d45$Blat.v2.4$913abec0@zahav.net.il> (raw)
In-Reply-To: <428DD67E.2030507@virtutech.com> (message from Johan Rydberg on Fri, 20 May 2005 14:22:22 +0200)
> Date: Fri, 20 May 2005 14:22:22 +0200
> From: Johan Rydberg <jrydberg@virtutech.com>
> Cc: dan@shearer.org, gdb@sources.redhat.com
>
> (1) foo (i);
> 0: 80 7f 00 08 lwz r3,8(r31)
> 4: 48 00 00 01 bl X <foo>
> 8: nop
> (2) i = 0;
> c: 38 00 00 00 li r0,0
> 10: 90 1f 00 08 stw r0,8(r31)
>
> <foo>:
> ....
> 4c: 4e 80 00 20 blr
>
> You start with PC = c, and single steps backwards. You end up on
> the nop-insn. This is inside the single step range of line 1. So
> you single step another instruction backwards, and suddenly you
> stop at PC = 4c
I guess I don't understand how backwards movement works, because I
thought stepping backwards over the branch instruction does _not_ take
the branch, but rather rewinds the machine state to what it was before
the branch instruction.
Anyway, thanks for the explanations.
> >>+ add_com_alias ("rn", "rnext", class_run, 1);
> >
> > Do we want another alias called "previous"?
>
> I think so, and maybe also "prev" and/or "pre".
The additional aliases won't be necessary, since they both are
unambiguous abbreviations of "previous". So they will work even if we
don't define them as aliases.
next prev parent reply other threads:[~2005-05-20 14:12 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-19 1:23 Dan Shearer
2005-05-19 13:01 ` Johan Rydberg
2005-05-19 13:18 ` Daniel Jacobowitz
2005-05-19 13:47 ` Johan Rydberg
2005-05-20 10:37 ` Eli Zaretskii
2005-05-20 11:37 ` Andreas Schwab
2005-05-20 13:18 ` Daniel Jacobowitz
2005-05-20 13:36 ` Fabian Cenedese
2005-05-20 13:47 ` Daniel Jacobowitz
2005-05-20 14:41 ` Eli Zaretskii
2005-05-20 22:14 ` Daniel Jacobowitz
2005-05-20 12:22 ` Johan Rydberg
2005-05-20 13:19 ` Daniel Jacobowitz
2005-05-20 14:12 ` Eli Zaretskii [this message]
2005-05-20 13:14 ` Daniel Jacobowitz
2005-05-20 14:34 ` Eli Zaretskii
2005-05-20 15:40 ` Johan Rydberg
2005-05-20 10:47 ` Eli Zaretskii
-- strict thread matches above, loose matches on Subject: below --
2005-05-21 15:53 Paul Schlie
2005-05-20 22:11 Michael Snyder
2005-05-20 23:32 ` Paul Schlie
2005-05-20 21:59 Michael Snyder
2005-05-20 21:51 Michael Snyder
2005-05-21 9:44 ` Eli Zaretskii
2005-05-20 21:44 Michael Snyder
2005-05-20 21:25 Michael Snyder
2005-05-20 21:16 Michael Snyder
2005-05-20 21:31 ` Daniel Jacobowitz
2005-05-21 9:39 ` Eli Zaretskii
2005-05-23 18:19 ` Michael Snyder
2005-05-20 21:11 Michael Snyder
2005-05-20 21:27 ` Daniel Jacobowitz
2005-05-20 19:02 Michael Snyder
2005-05-20 20:43 ` Eli Zaretskii
2005-05-20 21:03 ` Michael Snyder
2005-05-20 15:49 Paul Schlie
2005-05-20 17:41 ` Dan Shearer
2005-05-20 22:01 ` Paul Schlie
2005-05-20 22:08 ` Daniel Jacobowitz
2005-05-20 22:43 ` Paul Schlie
2005-05-21 0:58 ` Daniel Jacobowitz
2005-05-21 1:42 ` Paul Schlie
2005-05-21 1:53 ` Daniel Jacobowitz
2005-05-21 1:56 ` Daniel Jacobowitz
2005-05-21 15:03 ` Paul Schlie
2005-05-21 14:13 ` Paul Schlie
2005-05-21 14:23 ` Daniel Jacobowitz
2005-05-21 15:04 ` Paul Schlie
2005-05-20 20:58 ` Michael Snyder
2005-05-20 21:35 ` Paul Schlie
2005-05-16 17:47 Dan Shearer
2005-05-16 18:04 ` Dan Shearer
2005-05-20 18:15 ` Daniel Jacobowitz
2005-05-21 0:05 ` Frank Ch. Eigler
2005-05-21 10:13 ` Eli Zaretskii
2005-05-21 10:28 ` Russell Shaw
2005-05-21 12:38 ` Eli Zaretskii
2005-05-21 12:55 ` Russell Shaw
2005-05-21 14:39 ` Russell Shaw
2005-05-21 14:19 ` Daniel Jacobowitz
2005-05-21 15:46 ` Eli Zaretskii
2005-05-21 17:43 ` Daniel Jacobowitz
2005-05-23 19:39 ` Dan Shearer
2005-05-12 23:08 Michael Snyder
2005-05-13 6:23 ` Eli Zaretskii
2005-05-19 13:46 ` Daniel Jacobowitz
2005-05-19 18:46 ` Michael Snyder
2005-05-19 19:26 ` Johan Rydberg
2005-05-20 10:55 ` Eli Zaretskii
2005-05-20 13:04 ` Daniel Jacobowitz
2005-05-20 14:30 ` Eli Zaretskii
2005-05-20 14:43 ` Andreas Schwab
2005-05-20 20:48 ` Michael Snyder
2005-05-20 20:51 ` Daniel Jacobowitz
2005-05-20 20:38 ` Michael Snyder
2005-05-20 15:05 ` Vladimir Prus
2005-05-20 15:58 ` Eli Zaretskii
2005-05-20 18:14 ` Daniel Jacobowitz
2005-05-20 18:30 ` Eli Zaretskii
2005-05-20 19:27 ` Stan Shebs
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