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Index > Main > SMX instructions and their assembler syntax

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MazeGen



Joined: 06 Oct 2003
Posts: 977
Location: Czechoslovakia
MazeGen
Intel's SMX extensions instructions use weird mnemonics:
Quote:
GETSEC[CAPABILITIES]
GETSEC[ENTERACCS]
GETSEC[EXITAC]
GETSEC[SENTER]
GETSEC[SEXIT]
GETSEC[PARAMETERS]
GETSEC[SMCRTL]
GETSEC[WAKEUP]

I don't like having brackets as a part of the mnemonic. And something like "GETSEC[CAPABILITIES]" is too long.

How should we implement these in an assembler? Should we use only the part inside brackets?

BTW, is there any example of assembler code which uses these instructions?
Post 17 Mar 2009, 10:33
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
Quote:
How should we implement these in an assembler? Should we use only the part inside brackets?

when writing about these instructions, people usually use just "senter" etc. so yeah.

Quote:
BTW, is there any example of assembler code which uses these instructions?

BluePill2 source. But I am not sure whether s/he DB-ed opcodes or used assembler syntax.
Post 17 Mar 2009, 10:44
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HyperVista



Joined: 18 Apr 2005
Posts: 691
Location: Virginia, USA
HyperVista
vid wrote:
But I am not sure whether s/he ....
LOFL!!
Post 17 Mar 2009, 11:26
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MazeGen



Joined: 06 Oct 2003
Posts: 977
Location: Czechoslovakia
MazeGen
Couldn't find them in the sources.

Now I wonder what is Tomasz's prefered syntax Smile
Post 17 Mar 2009, 11:55
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DJ Mauretto



Joined: 14 Mar 2007
Posts: 464
Location: Rome,Italy
DJ Mauretto
This instructions have the same opcode OF 37 ,
change only the EAX value( plus EBX ECX parameters) ,like CPUID
my favorite way is this:
Code:
xor  eax,eax       ; Get Capabilities
xor  ebx,ebx       ; Index 0
Getsec             ; 0F37

mov  eax,2                        ; ENTERACCS
mov  ebx,Physical_Address
mov  ecx,Code_Size
Getsec                               ; 0F37


; and so on    

I like number ,but i think that many people prefer mnemonic Rolling Eyes

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Post 17 Mar 2009, 12:51
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comrade



Joined: 16 Jun 2003
Posts: 1137
Location: Russian Federation
comrade
Did a woman design this syntax?

Image
Post 17 Mar 2009, 13:45
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
My bad, it's not in bluepill, I have mistaken what SMX is Embarassed
Post 17 Mar 2009, 13:49
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Tomasz Grysztar



Joined: 16 Jun 2003
Posts: 7781
Location: Kraków, Poland
Tomasz Grysztar
MazeGen wrote:
Now I wonder what is Tomasz's prefered syntax Smile
DJ Mauretto has already shown the syntax that fasm uses. Smile

And that weird syntax clearly calls for macro: Wink
Code:
macro getsec op
{
  match [=capabilities],op \{ xor eax,eax \}
  match [=enteraccs],op \{ mov eax,2 \}
  match [=exitac],op \{ mov eax,3 \}
  match [=senter],op \{ mov eax,4 \}
  match [=sexit],op \{ mov eax,5 \}
  match [=parameters],op \{ mov eax,6 \}
  match [=smcrtl],op \{ mov eax,7 \}
  match [=wakeup],op \{ mov eax,8 \}
  getsec
}

getsec[capabilities]    
Post 17 Mar 2009, 19:26
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HyperVista



Joined: 18 Apr 2005
Posts: 691
Location: Virginia, USA
HyperVista
vid wrote:
My bad, it's not in bluepill, I have mistaken what SMX is

It's easy to mistake VMX for SMX (only 0x03 difference between the two) Smile
Post 17 Mar 2009, 22:08
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MazeGen



Joined: 06 Oct 2003
Posts: 977
Location: Czechoslovakia
MazeGen
Tomasz Grysztar wrote:
DJ Mauretto has already shown the syntax that fasm uses. Smile

Doh, didn't realized that fasm supports GETSEC already.

And looking into NASM manual, it supports only GETSEC as well.
Post 18 Mar 2009, 07:44
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