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Index > Windows > Bug with 64-bit dword registers in proc64.inc / fastcall?

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KingDemon



Joined: 16 Oct 2006
Posts: 21
Location: Somewhere in Romania
KingDemon
Hi, I'm getting "Error: operand sizes do not match" on this line of code:
Code:
invoke  wsprintf, rdi, msg, r12d    

I also tried adding the dword size modifier, but still get the error:
Code:
invoke  wsprintf, rdi, msg, dword r12d    

The fastcall macro translates the last parameter to "mov r8b, r12d":
Code:
        else if size@param = 1
         if ~ param eq r8b
          mov r8b,param
         end if
        end if     

I then tracked it down to where size@param was being set:
Code:
        virtual
         origin = $
         inc param
         load opcode byte from origin
         if opcode = 67h; | opcode = 41h
          load opcode byte from origin+1
         end if
         if opcode and 0F8h = 48h
          size@param = 8
         else if opcode = 66h
          size@param = 2
         else if opcode = 0FFh
          size@param = 4
         else
          size@param = 1
         end if
        end virtual    


The commented-out part is my addition to fix the problem. For some reason, the "inc r12d" instruction in this case gets encoded with the 0x41 prefix-opcode added to it.

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Post 18 Feb 2014, 19:09
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Tomasz Grysztar



Joined: 16 Jun 2003
Posts: 7756
Location: Kraków, Poland
Tomasz Grysztar
You are using an outdated version of fasmw package. This bug had been fixed a few months ago.
Post 18 Feb 2014, 19:55
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KingDemon



Joined: 16 Oct 2006
Posts: 21
Location: Somewhere in Romania
KingDemon
Thanks... I had 1.70.03. Time to update.
Post 19 Feb 2014, 20:50
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