:[diStorm}: problem decoding fnstsw

[Sanjay Patel]

Ah, I see - I was looking at the wrong encoding. You're correct - this should
be 'FNSTSW AX'.

Putting the operand to be in the operand string rather than the mnemonic
would be nice, but it's not a high priority request. If I separate the
mnemonic/operands with a tab or separate columns in a table, it makes the
formatting nicer.

Thanks,
Sanjay

--- Gil Dabah <arkon at ragestorm.net> wrote:

> There are a few decoding for this instruction.
> The constant 0xdf, 0xe0 which results in fnstsw ax (according to the AMD
> specs it's AX, 16 bits operation).
> And 0xdd, <modrm byte /7> which results in FNSTSW rm16.
> But the modrm byte value must be lower than 0xC0, because that instruction
> supports only memory indirection operand.
> 
> Maybe I should indeed put the AX in the operands string rather than the
> mnemonic string itself.
> I have never considered this before. If that might help you, I am willing
> to
> do so.
> 
> On 2/13/07, Sanjay Patel <sanjay3000 at yahoo.com> wrote:
> >
> > I think this 2 byte sequence should be "fnstsw eax":
> >
> > 0xdf, 0xe0
> >
> > But diStorm seems to be returning "fnstsw ax" all in the mnemonic string
> > rather than putting 'ax' into the operand string. My reading of the
> > manuals
> > is not very good - the modrm byte is specified as /7 - so does that mean
> > that
> > 0xe0 is invalid in this case?
> >
> > --Sanjay
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
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> 



 
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