section .data
    hello db "hello world!", 0xa, 0

section .text

global main;  // 程序入口点,要调c的库函数要用main,否则链接时提示找不到main

main:
    push dword hello  ;; //c函数参数传递放在栈中
    extern printf           
    call printf                 ; // 调用外部函数的作用

    add esp, byte 4      ;; // 事实上这是一个出栈动作,以让程序找到正确的地址进行返回
    ret

nasm -f elf hello.asm -o hello.o
tcc  hello.o -o hello.exe -m32

section .data
    format db "%d", 0xa, 0;

section .text

    global main
    main:
        mov eax, 0
        mov ecx, 100

    l:
        add eax, ecx
        loop l
        ;mov eax, (1+100)*100/2;

        extern printf
        push dword eax;
        push dword format;   printf(const char*,...);
        call printf
        add esp, byte 8
        ret

STD_OUTPUT_HANDLE   equ -11
NULL                equ 0

global main

extern ExitProcess, GetStdHandle, WriteConsoleA

section .data
msg                 db "Hello World!", 13, 10, 0
msg.len             equ $ - msg

section .bss
dummy               resd 1

section .text

main:
    push    STD_OUTPUT_HANDLE
    call    GetStdHandle

    push    NULL
    push    dummy
    push    msg.len
    push    msg
    push    eax
    call    WriteConsoleA 

    push    NULL
    call    ExitProcess

nasm -f win32 hello.asm -o hello.obj
GoLink.exe /console /entry GobleyGook hello.obj kernel32.dll

Intel：mov eax, 4
AT&T：movl $4, %eax

Intel：mov al, byte ptr foo
AT&T：movb foo, %al

; masm 编译器自动加上:
;   push ebp
;   mov ebp,esp

;masm
mov edi,[PVal]; 与 mov edi,PVal 结果一样
 mov eax,[var1]; 与 mov eax,var1 结果一样