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Date: Tue, 02 Mar 2010 22:07:00 -0000
Message-ID: <6dc9ffc81003021407l27b513cbm288d1fd1e43d0c46@mail.gmail.com>
Subject: Re: PATCH: Support x86 pseudo registers
From: "H.J. Lu" <hjl.tools@gmail.com>
To: Michael Snyder <msnyder@vmware.com>
Cc: Eli Zaretskii <eliz@gnu.org>, gdb-patches@sourceware.org
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On Tue, Mar 2, 2010 at 1:59 PM, H.J. Lu <hjl.tools@gmail.com> wrote:
> On Tue, Mar 2, 2010 at 1:57 PM, Michael Snyder <msnyder@vmware.com> wrote:
>> Daniel Jacobowitz wrote:
>>>
>>> On Tue, Mar 02, 2010 at 11:47:35PM +0200, Eli Zaretskii wrote:
>>>>
>>>> Who can help out here? =A0I can help with wording, if someone tells the
>>>> story.
>>>
>>> Presumably H. J. knows why he wrote the patch?
>>>
>>> I presume it lets us say $ah or $ax in addition to $eax, and lets $eax
>>> work on 64-bit systems where we really have $rax.
>>
>> Mmm hmm, and the context would be expressions or anywhere where a
>> register name is appropriate (eg. info reg). =A0Yes?
>>
>
> Yes.
>
> (top-gdb) info reg $edi
> edi =A0 =A0 =A0 =A0 =A0 =A00x1 =A0 =A0 =A01
> (top-gdb) info reg $rdi
> rdi =A0 =A0 =A0 =A0 =A0 =A00x1 =A0 =A0 =A01
> (top-gdb) info reg $dl
> dl =A0 =A0 =A0 =A0 =A0 =A0 0xd8 =A0 =A0 -40
> (top-gdb) info reg $dil
> dil =A0 =A0 =A0 =A0 =A0 =A00x1 =A0 =A0 =A01
> (top-gdb)
>
>

Basically, you can access any byte/word/dword registers, as shown
in assembly code, the same way as word/dword registers.


--=20
H.J.