From: Andrew Cagney <ac131313@cygnus.com>
To: Eli Zaretskii <eliz@is.elta.co.il>
Cc: Andrew Morton <akpm@zip.com.au>, gdb@sources.redhat.com
Subject: Re: bitwise operations on registers
Date: Mon, 11 Mar 2002 07:35:00 -0000 [thread overview]
Message-ID: <3C8CCEAF.2030803@cygnus.com> (raw)
In-Reply-To: <Pine.SUN.3.91.1020311130105.17471A-100000@is>
> On Sun, 10 Mar 2002, Andrew Morton wrote:
>
>
>> (gdb) p $esp & 4
>> Argument to arithmetic operation not a number or boolean.
>> (gdb)
>>
>> I don't seem to be able to perform the `&' and `|' arithmetic
>> operators against machine registers.
>
>
> "p $eax & 4" works for me. Doesn't it work for you?
>
> As for $esp, I think GDB knows that it's not a number, so try
>
> (gdb) p (int)$esp & 4
>
> (I don't know whether the built-in knowledge GDB has about $esp should
> prevent it from working without the cast, though.)
Yes, try:
(gdb) p (void*)0 & 4
So, this a bug?
Andrew
next prev parent reply other threads:[~2002-03-11 15:35 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-10 23:50 Andrew Morton
2002-03-11 3:04 ` Eli Zaretskii
2002-03-11 7:35 ` Andrew Cagney [this message]
2002-03-11 7:39 ` Daniel Jacobowitz
2002-03-14 19:12 ` Andrew Cagney
[not found] ` <3C9173AD.E2FBA5DA@zip.com.au>
2002-03-14 21:03 ` Daniel Jacobowitz
2002-03-27 13:43 ` Andrew Cagney
2002-03-27 14:55 ` Daniel Jacobowitz
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