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Date: Thu, 14 May 2009 07:11:00 -0000
Message-ID: <daef60380905140011p1108487doceb999b1036a740d@mail.gmail.com>
Subject: Re: MMX & Floating point insn suport for reversible debugging
From: Hui Zhu <teawater@gmail.com>
To: paawan oza <paawan1982@yahoo.com>
Cc: gdb ml <gdb@sourceware.org>
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On Thu, May 14, 2009 at 00:44, paawan oza <paawan1982@yahoo.com> wrote:
>
> I have gone through i387-tdep.c.
> and I have come up with following doubts.
>
> =A0here I start adding floating point register support.
> =A0I think curerntly it records the memory
>
> =A0so remaining thing for floating point is store
> =A0registers st0 to st7.
>
>
>> > code to be added here...
>> > =A0 /* floats */
>> > =A0 =A0 =A0/* It just record the memory change of
>> instrcution. */
>> > =A0 =A0case 0xd8:
>> > =A0 =A0case 0xd9:
>> > =A0 =A0case 0xda:
>> > =A0 =A0case 0xdb:
>> > =A0 =A0case 0xdc:
>> > =A0 =A0case 0xdd:
>> > =A0 =A0case 0xde:
>> > =A0 =A0case 0xdf:
>> >
>> >
> =A0 =A0do we need to collect affect FPU flags !!

If gdb can output and set this flags, you need to do it.
And I suggest you post more clear information about your question that
you know when you have question with it.  It will make people reply
you mail easyly, right?  :)

>
> =A0 =A0and another thing is ;
> =A0 =A0take floating point insn
> =A0 =A0opcode =A0mnemnic =A0 desc
> =A0 =A0DE F9 =A0 FDIVP =A0 =A0 Divide ST(1) by ST(0),
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0store result in ST(1), and
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0pop the register stack.
>
> I do not think code is taking care of 2 bytes floating
> instruction..
> I suspoe ModR/M and SIB byte encoding is taken care
> with respect to floating point.

Why you can't put the code for "DE F9" in:
>> >    case 0xde:


Thanks,
Hui