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section     .text
global      _start                              ;must be declared for linker (ld)
 
_start:                                         ;tell linker entry point
 
    mov     edx,len                             ;message length
    mov     ecx,msg                             ;message to write
    mov     ebx,1                               ;file descriptor (stdout)
    mov     eax,4                               ;system call number (sys_write)
    int     0x80                                ;call kernel
 
    mov     eax,1                               ;system call number (sys_exit)
    int     0x80                                ;call kernel
 
section     .data
 
msg     db  'Hello, world!',0xa                 ;our dear string
len     equ $ - msg                             ;length of our dear string

prog.s: Assembler messages:
prog.s: Warning: end of file not at end of a line; newline inserted
prog.s:1: Error: no such instruction: `section .text'
prog.s:2: Error: no such instruction: `global _start'
prog.s:2: Error: no such instruction: `must be declared for linker (ld)'
prog.s:4: Error: no such instruction: `tell linker entry point'
prog.s:6: Error: too many memory references for `mov'
prog.s:6: Error: no such instruction: `message length'
prog.s:7: Error: too many memory references for `mov'
prog.s:7: Error: no such instruction: `message to write'
prog.s:8: Error: too many memory references for `mov'
prog.s:8: Error: no such instruction: `file descriptor (stdout)'
prog.s:9: Error: too many memory references for `mov'
prog.s:9: Error: no such instruction: `system call number (sys_write)'
prog.s:10: Error: operand size mismatch for `int'
prog.s:12: Error: too many memory references for `mov'
prog.s:12: Error: no such instruction: `system call number (sys_exit)'
prog.s:13: Error: operand size mismatch for `int'
prog.s:15: Error: no such instruction: `section .data'
prog.s:17: Error: no such instruction: `msg db 72ello,world!440xa'
prog.s:17: Error: no such instruction: `our dear string'
prog.s:18: Error: no such instruction: `len equ $ - msg'
prog.s:18: Error: no such instruction: `length of our dear string'

Standard output is empty