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how to "nop ptr[eax + 0x00]" on C++ _asm inline

 
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devAnd
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Joined: 22 Jun 2020
Posts: 13
Location: C#, java and ASM
PostPosted: Wed Aug 11, 2021 7:52 pm    Post subject: how to "nop ptr[eax + 0x00]" on C++ _asm inline Reply with quote
Hello guys!!

i have this code in asm:
Code:

cmp ecx,46DC0E00
je 1A380021
nop dword ptr [eax+00]
mov [edx+00000584],ecx
mov [edx+00000584],00000000
jmp game.exe+A42067
mov [edx+00000584],ecx
jmp game.exe+A42067



and i have this code on C++:
Code:
__asm
   {
      cmp ecx, 0x46DC0E00
      je $ + 0x19 //25 bytes

      //i need put NOP DWORD here

      mov[edx + 0x00000584], ecx
      mov[edx + 0x00000584], 0
      jmp JmpBack
      mov[edx + 0x00000584], ecx
      jmp JmpBack
   }


how do I put this nop dword in the c++ code?
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devAnd
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Joined: 22 Jun 2020
Posts: 13
Location: C#, java and ASM
PostPosted: Thu Aug 12, 2021 8:44 pm    Post subject: Reply with quote
Solved, just use:

Code:
#define nopDwordPTR __asm _emit 0x0F __asm _emit 0x1F __asm _emit 0x40 __asm _emit 0x00
   
__asm
   {
      push eax
      mov eax, 0
      cmp ecx, 0x46DC0E00
      je $ + 0x1D
      nopDwordPTR
      mov[edx + 0x00000584], ecx
      mov[edx + 0x00000584], eax
      pop eax
      jmp OneHitJmpBack
      mov[edx + 0x00000584], ecx
      jmp OneHitJmpBack
   }
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atom0s
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PostPosted: Fri Aug 13, 2021 3:40 am    Post subject: Reply with quote
MSVC's inline assembler uses the 'align' keyword to inject the multibyte nop's if you wanted to go that route instead of doing emits.

https://docs.microsoft.com/en-us/cpp/assembler/inline/even-and-align-directives?view=msvc-160

Keep in mind, it's generally used for loop alignment to make them faster. Depending on where you're cave is injected and your code is aligned to, it may not need it and you could potentially be slowing the code down some.
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STN
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PostPosted: Fri Aug 13, 2021 8:52 am    Post subject: Reply with quote
just nop nop nop nop
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