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   comp.lang.asm.x86      Ahh, the lost art of x86 assembly      4,675 messages   

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   Message 4,403 of 4,675   
   R.Wieser to All   
   Re: FPU (x87) code debugging.   
   08 Aug 21 16:00:47   
   
   From: address@nospicedham.not.available   
      
   Wolfgang,   
      
   > you seem to work with 32 bit:   
      
   I am.  Didn't think it would matter much.   
      
   > 0F AE 07   FXSAVE [edi]   
      
   I just tried that one, and it worked !   (got 288 bytes of data though, not   
   512)  As a result I'm now thoroughly confused in regard to the mod, reg, r/m   
   encoding.   I tried different ones, but only got crashes.   
      
   > you used 27, so I were confused and had you look at my AMD docs,   
      
   That value was suggested by Robert (in his code).  And as I didn't get   
   anywhere ...   
      
      
   Oh blimy - I don't know how I did it, but I just noticed that I somehow   
   mixed up the 16 and 32-bit mod/reg/rm encodings.  With the MOD and REG both   
   being zero the by R/M targetted registers are rather different between them.   
   :-|   
      
   Bottom line: I made a stupid mistake, created non-working code and got   
   myself confused as a result.   And as I presumptiously forgot to mention the   
   basics of what I was busy with (32-bit coding) I did really help you guys   
   find the cause of it.    My apologies for that.   
      
   Regards,   
   Rudy Wieser   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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