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- # ----------------------------------------------------------------------------------------
- # Writes "Hello, World" to the console using only system calls. Runs on 64-bit Linux only.
- # To assemble and run:
- #
- # gcc -c hello.s && ld hello.o && ./a.out
- #
- # or
- #
- # gcc -nostdlib hello.s && ./a.out
- # ----------------------------------------------------------------------------------------
- .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\n"
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