Hello World

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.global _start .text _start: # write(1, message, 13) mov $1, %rax # system call 1 is write mov $1, %rdi # file handle 1 is stdout mov $message, %rsi # address of string to output mov $13, %rdx # number of bytes syscall # invoke operating system to do the write # exit(0) mov $60, %rax # system call 60 is exit xor %rdi, %rdi # we want return code 0 syscall # invoke operating system to exit message: .ascii "Hello, world!"

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