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Why do I get Floating point exception when I divide?

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Why do I get Floating point exception when I divide?, using idiv x86 nasm

no2pencil	27 Aug, 2008 - 12:12 AM Post #1
My fridge be runnin OH NOEZ! Joined: 10 May, 2007 Posts: 6,328 Thanked 57 times Dream Kudos: 2375 Expert In: Goofing Off My Contributions	CODE _div: ; use division push ebp ; bring in the arguments. mov ebp, esp mov eax, [ebp+8]; Argument 1 mov edx, [ebp+12]; Argument 2 xor edx, edx; clear out register edx mov edx, ebx; Place ebx argument 2 into ebx idiv ebx; Divide EDX:EAX by EBX pop eax; Return the quotient ret No matter what arguments I give, I get the dreaded floating point exception error. I can't find a proper explanation w/Google as to why! Any ideas?
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no2pencil	27 Aug, 2008 - 12:41 AM Post #2
My fridge be runnin OH NOEZ! Joined: 10 May, 2007 Posts: 6,328 Thanked 57 times Dream Kudos: 2375 Expert In: Goofing Off My Contributions	I'm not sure if this is correct, but this is what I did to fix it : CODE _div: push ebp mov ebp, esp mov eax, [ebp+8] ; low mov edx, 0 ; high idiv dword [ebp+12] ; divide edx:eax by ebp+12 (2nd argument) mov [ebp+12],eax ; Store the remainder back into ebp pop ebp ; return the quotient ret
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AmitTheInfinity	27 Aug, 2008 - 12:50 AM Post #3
C Surfing ∞ Joined: 25 Jan, 2007 Posts: 1,015 Thanked 34 times Dream Kudos: 125 My Contributions	You copied your argument 2 in edx and then cleared it in next statement using XOR. I think you wanted to copy your second argument in ebx instead of edx, right? CODE mov edx, [ebp+12]; Argument 2 You copied it to edx and not ebx xor edx, edx; clear out register edx mov edx, ebx; Place ebx argument 2 into ebx but you never had argument 2 in ebx!!! May be it was just a typo. Correct it and see whether it works.
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no2pencil	27 Aug, 2008 - 12:57 AM Post #4
My fridge be runnin OH NOEZ! Joined: 10 May, 2007 Posts: 6,328 Thanked 57 times Dream Kudos: 2375 Expert In: Goofing Off My Contributions	QUOTE(AmitTheInfinity @ 27 Aug, 2008 - 04:50 AM) Correct it and see whether it works. Yeah Now how can I return the remainder? Shouldn't it be in register edx?
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