Multi-byte NOP instructions support

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vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 24 Jul 2006, 17:51

same way like some guy patented a wheel after law change in astrualia...

america is off the way, same way like roman empire was in cca 500 AD.... and it will end same way, unfortunately

24 Jul 2006, 17:51

Hunter

Joined: 07 Jun 2006
Posts: 41

Hunter 16 Aug 2006, 09:15

Tomasz, Why don't you want to support muti-byte NOP for completeness? Wink

16 Aug 2006, 09:15

Madis731

Joined: 25 Sep 2003
Posts: 2139
Location: Estonia

Madis731 18 Aug 2006, 11:50

Hmm, but how would it be implemented then?

Code:

nop
word nop
dword nop

or something else?

18 Aug 2006, 11:50

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 18 Aug 2006, 12:25

if, then "nop word", not otherwise Smile

18 Aug 2006, 12:25

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8268
Location: Kraków, Poland

Tomasz Grysztar 18 Aug 2006, 12:40

The syntax like "nop dword [eax]" appears obvious from the opcode point of view, though its usability is questionable. Perhaps the syntax where you could directly specify how many bytes long NOP you want would be better, but for this I'd stick to macro solution (we can make a package of code alignment macros for different processors).

18 Aug 2006, 12:40

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 18 Aug 2006, 13:04

i also like the idea with macros more... anyway, it's still just optimization, all those instructions are encodeable using current assembler

18 Aug 2006, 13:04

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4624
Location: Argentina

LocoDelAssembly 18 Aug 2006, 14:13

My Athlon64 reaches int3 with this

Code:

format PE GUI 4.0

macro nop src 
{ 
local ..lea 
  if ~src eq 
    db $0F 
    ..lea: lea eax, src 
    store $1F at ..lea 
  else 
    nop 
  end if 
} 
irps instr, noP nOp nOP Nop NoP NOp NOP {macro instr src \{nop src\}} 

nop dword [ebx+esi+5]
int3

18 Aug 2006, 14:13

Hunter

Joined: 07 Jun 2006
Posts: 41

Hunter 18 Aug 2006, 15:31

I think, It's needed for completeness, because it's official Intel instruction and official mnemocode. Smile

18 Aug 2006, 15:31

MazeGen

Joined: 06 Oct 2003
Posts: 977
Location: Czechoslovakia

MazeGen 21 Aug 2006, 15:57

vid wrote:

same way like some guy patented a wheel after law change in astrualia...

Sorry for off-topic, I couldn't resist. Friend of mine has found the link:

http://news.bbc.co.uk/2/hi/asia-pacific/1418165.stm

21 Aug 2006, 15:57

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