Re: MMX & Floating point insn suport for reversible debugging

[Hui Zhu <teawater at gmail dot com>]

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.
>
> ?here I start adding floating point register support.
> ?I think curerntly it records the memory
>
> ?so remaining thing for floating point is store
> ?registers st0 to st7.
>
>
>> > code to be added here...
>> > ? /* floats */
>> > ? ? ?/* It just record the memory change of
>> instrcution. */
>> > ? ?case 0xd8:
>> > ? ?case 0xd9:
>> > ? ?case 0xda:
>> > ? ?case 0xdb:
>> > ? ?case 0xdc:
>> > ? ?case 0xdd:
>> > ? ?case 0xde:
>> > ? ?case 0xdf:
>> >
>> >
> ? ?do 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?  :)

>
> ? ?and another thing is ;
> ? ?take floating point insn
> ? ?opcode ?mnemnic ? desc
> ? ?DE F9 ? FDIVP ? ? Divide ST(1) by ST(0),
> ? ? ? ? ? ? ? ? ? ? ?store result in ST(1), and
> ? ? ? ? ? ? ? ? ? ? ?pop 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