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Example of using NASM Netwide Assembler online via https://cocalc.com.

Project: public
Path: nasm / hello.asm
Views: 77
License: OTHER
Image: ubuntu2004
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; ----------------------------------------------------------------------------------------
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;
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; From https://cs.lmu.edu/~ray/notes/nasmtutorial/
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;
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; Writes "Hello, World" to the console using only system calls. Runs on 64-bit Linux only.
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; To assemble and run:
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;
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; nasm -felf64 hello.asm && ld hello.o && ./a.out
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; ----------------------------------------------------------------------------------------
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global _start
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section .text
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_start: mov rax, 1 ; system call for write
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mov rdi, 1 ; file handle 1 is stdout
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mov rsi, message ; address of string to output
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mov rdx, 13 ; number of bytes
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syscall ; invoke operating system to do the write
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mov rax, 60 ; system call for exit
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xor rdi, rdi ; exit code 0
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syscall ; invoke operating system to exit
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section .data
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message: db "Hello, World", 10 ; note the newline at the end
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