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format ELF64
extrn printf
extrn scanf
extrn puts
public main
section '.text' executable
main: push rbp
mov rbp,rsp
mov edi,prompt
call puts
sub rsp,16
mov rsi,rsp
mov edi,scan
xor eax,eax
call scanf
mov rax,[rsp]
add rsp,16
mov rsi,rax
lea rcx,[rax-1]
top: mul rcx
sub rcx,1
jnz top
print: mov edi,msg
mov rdx,rax
xor eax,eax
call printf
leave
ret
section '.data' writable
msg db "Factorial of %d is %d",0xA,0
scan db "%d",0
prompt db "Enter an unsigned integer.",0
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