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; fasm demonstration of writing 64-bit ELF executable
; (thanks to František Gábriš)
; syscall numbers: /usr/src/linux/include/asm-x86_64/unistd.h
; parameters order:
; r9 ; 6th param
; r8 ; 5th param
; r10 ; 4th param
; rdx ; 3rd param
; rsi ; 2nd param
; rdi ; 1st param
; eax ; syscall_number
; syscall
format ELF64 executable 3
segment readable executable
entry $
mov edx,msg_size ; CPU zero extends 32-bit operation to 64-bit
; we can use less bytes than in case mov rdx,...
lea rsi,[msg]
mov edi,1 ; STDOUT
mov eax,1 ; sys_write
syscall
xor edi,edi ; exit code 0
mov eax,60 ; sys_exit
syscall
segment readable writeable
msg db 'Hello 64-bit world!',0xA
msg_size = $-msg
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