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8.0

assembly 8086 factorial question

Asked by keepthepeace in Assembly Programming Language, C Programming Language, Miscellaneous Programming

Hello im trying to convert a c function into assembly :
What am i doing worng ? I do not understand how procedures work that well ?

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             #include<stdio.h>
 
unsigned int factorial(unsigned int n);
 
_declspec(naked) void 
 f(unsigned int input,unsigned int *output)
{
	// use this function to call factorial(n) and to write the result of factorial(n) 
	//into the memory location at address &output upon the return from factorial(n)
	__asm{
 
		push eax
		push ebx
		push ecx
		push edx 
 
 
		mov ebx,input
		push ebx
		call factorial
		pop ebx
 
 
	
		ret
	}
	
}
 
__declspec(naked) unsigned int
factorial(unsigned int n)
{
	__asm{
		mov ebx, dword ptr[esi + 8]
		cmp ebx, 1
			jle RETURN;
 
 
RETURN:
		mov eax,1
 
 
 
	}
}

           
         

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assembly 8086 factorial question

Asked by keepthepeace in Assembly Programming Language, C Programming Language, Miscellaneous Programming

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