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Date: Wed, 13 May 2009 16:38:00 -0000
Message-ID: <daef60380905130937g5b845d4fm278ab5d3755b6278@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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Maybe you can read i387-tdep.c.

Thanks,
Hui

On Thu, May 14, 2009 at 00:17, paawan oza <paawan1982@yahoo.com> wrote:
>
> Hi Hui,
>
> file : linux-tdep.c
> function : i386_process_record
>
> here I start adding floating point register support.
> I think it records the memory
>
> so remaining thing for floating point is store registers 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:
>
>
> I am not sure ptrace will give FPU affected flags !!!
>
> and another thing is ;
> take floating point insn
> opcode =A0mnemnic =A0 desc
> DE F9 =A0 FDIVP =A0 =A0 Divide ST(1) by ST(0),
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0store result in ST(1), and pop the reg=
ister 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 float=
ing point.
>
> please clarify.
>
> Regards,
> Oza.
>
>
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