CoCalc -- hello.asm

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

Project: public

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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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