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| 1 |
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| 2 | segment .text
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| 3 | global main
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| 4 | extern printf
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| 5 |
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| 6 | main: mov eax, 0
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| 7 | call stampa
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| 8 | lock bts dword [x], 0
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| 9 | jc salta ; gi\`a settato
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| 10 | call stampa
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| 11 | salta: lock bts dword [x], 0
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| 12 | jnc _end
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| 13 | call stampa
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| 14 | jmp _end
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| 15 |
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| 16 | stampa: push dword [x]
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| 17 | push dword fmt
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| 18 | call printf
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| 19 | add esp, 8
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| 20 | ret
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| 21 |
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| 22 |
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| 23 | _end: mov eax, 1 ; call syscall exit
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| 24 | xor ebx, ebx ; exit status 0
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| 25 | int 0x80
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| 26 | hlt
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| 27 |
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| 28 | segment .data
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| 29 | x: dd 0
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| 30 |
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| 31 | segment .rodata
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| 32 | fmt: db "Il valore di x e` %x",0x0a,0 ; 0x0a -> a capo
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