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1 ; nasm -f elf hello.asm # this will produce hello.o ELF object file
2 ; ld -s -o hello hello.o # this will produce hello executable
3
4 section .text
5 global _start ;must be declared for linker (ld)
6
7 _start: ;tell linker entry point
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9 00000000 BA0E000000 mov edx,len ;message length
10 00000005 B9[00000000] mov ecx,msg ;message to write
11 0000000A BB01000000 mov ebx,1 ;file descriptor (stdout)
12 0000000F B804000000 mov eax,4 ;system call number (sys_write)
13 00000014 CD80 int 0x80 ;call kernel
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15 00000016 B801000000 mov eax,1 ;system call number (sys_exit)
16 0000001B CD80 int 0x80 ;call kernel
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18 section .data
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20 00000000 48656C6C6F2C20776F- msg db 'Hello, world!',0xa ;our dear string
21 00000009 726C64210A
22 len equ $ - msg ;length of our dear string
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