i386, i486, ... control

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idle

Joined: 06 Jan 2011
Posts: 440
Location: Ukraine

idle 19 Jan 2011, 10:22

Does fasm recognize i386, i486 ... putting those in a stream?
Do the tables have reserved bytes for this?
Can such a modification be done easily?

19 Jan 2011, 10:22

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20757
Location: In your JS exploiting you and your system

revolution 19 Jan 2011, 10:30

See here. I think that is what you are asking for.

19 Jan 2011, 10:30

idle

Joined: 06 Jan 2011
Posts: 440
Location: Ukraine

idle 19 Jan 2011, 16:53

revolution, thanks
that is partial decision still

i486 has a built-in fpu but .486 macro does not allow such, why?

19 Jan 2011, 16:53

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20757
Location: In your JS exploiting you and your system

revolution 19 Jan 2011, 16:56

Not all 486's have the FPU.

Anyhow, just enable the FPU stuff with .486f instead, no problem.

19 Jan 2011, 16:56

idle

Joined: 06 Jan 2011
Posts: 440
Location: Ukraine

idle 19 Jan 2011, 17:32

.486f, but i do not expect conditional moves of floats to be available, fcomi... too

19 Jan 2011, 17:32

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20757
Location: In your JS exploiting you and your system

revolution 19 Jan 2011, 17:58

idle wrote:

.486f, but i do not expect conditional moves of floats to be available, fcomi... too

They aren't available with .486f

19 Jan 2011, 17:58

idle

Joined: 06 Jan 2011
Posts: 440
Location: Ukraine

idle 19 Jan 2011, 18:04

but:

Code:

macro .486f {
...
        invalidate_pentium
        invalidate_mmx
...
}

macro invalidate_pentium {
...
    invalidate_p6
...
}

macro invalidate_p6 {
    invalidate_fpu_p6
    invalidate_p6_p2
    invalidate rdpmc
    irp cc,c,z,e,s,a,b,g,l,ae,be,ge,le,o,p,pe,nc,nz,ne,ns,na,nb,ng,nl,nae,nbe,nge,nle,no,np,po \{
        invalidate cmov\#cc
    \}
}

19 Jan 2011, 18:04

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20757
Location: In your JS exploiting you and your system

revolution 19 Jan 2011, 18:14

Code:

macro invalidate_fpu_p6 {
    invalidate_sse
    invalidate fcmovb,fcmove,fcmovbe,fcmovu,fcmovnb,fcmovne,fcmovnbe,fcmovnu,\
             fcomi,fcomip,fucomi,fucomip
}

19 Jan 2011, 18:14

idle

Joined: 06 Jan 2011
Posts: 440
Location: Ukraine

idle 19 Jan 2011, 18:22

i do not understand what invalidate macro does but it works, thanks
i seems i'm too look through masm-internals with OllyDbg Smile

19 Jan 2011, 18:22

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20757
Location: In your JS exploiting you and your system

revolution 19 Jan 2011, 18:27

The invalidate macro just makes an impossible directive "rb -1". It is a deferrable error; that means that only when all ifs and other conditional expressions are fully resolved will the error be signalled.

19 Jan 2011, 18:27

idle

Joined: 06 Jan 2011
Posts: 440
Location: Ukraine

idle 19 Jan 2011, 18:33

oh, that's not optimal
if fasm's execution that would be very fast
every instruction handler could check some variable:

Code:

test    [machine],var_machine
jb      .error_etc

19 Jan 2011, 18:33

idle

Joined: 06 Jan 2011
Posts: 440
Location: Ukraine

idle 19 Jan 2011, 18:36

i put wrong code
smth working
you understand, i know
Wink

19 Jan 2011, 18:36

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20757
Location: In your JS exploiting you and your system

revolution 19 Jan 2011, 18:40

idle wrote:

oh, that's not optimal
if fasm's execution that would be very fast
every instruction handler could check some variable:
Code:
test    [machine],var_machine
jb      .error_etc
    

You need to suggest this to Tomasz, not me. But Tomasz has already stated that he prefers macro solutions so it seems we will have to be content with the current solution.

BTW: I did do that for fasmarm, but I have no control over the x86 version of fasm.

19 Jan 2011, 18:40

idle

Joined: 06 Jan 2011
Posts: 440
Location: Ukraine

idle 19 Jan 2011, 21:33

set www of your profile to fasm-arm - people (from wasm.ru) do not often know who you are

19 Jan 2011, 21:33

idle

Joined: 06 Jan 2011
Posts: 440
Location: Ukraine

idle 20 Jan 2011, 00:16

http://en.wikipedia.org/wiki/X86_instruction_listings

20 Jan 2011, 00:16

idle

Joined: 06 Jan 2011
Posts: 440
Location: Ukraine

idle 22 Jan 2011, 09:57

A one-line description of x87 instructions by unknown
Find 'These can be loaded using the FLD0, FLD1,'.
Tomasz, add fldz's alias please.
x87 was published in 1986, as i know, but i'm not sure whether that FLD0 is so popular since(that's history for me as i was absent).

22 Jan 2011, 09:57

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