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31 lines
765 B
NASM
31 lines
765 B
NASM
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.global _start
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//exposes a symbol called start to the assembler
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.intel_syntax noprefix
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//See: https://www.youtube.com/watch?v=6S5KRJv-7RU
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//See: https://blog.rchapman.org/posts/Linux_System_Call_Table_for_x86_64/
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_start:
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//write call (sys_write)
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mov rax,1
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//sys_write system call
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mov rdi, 1
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//unsigned int fd = 1 (stdout)
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lea rsi,[hello_world]
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//load effective address (lea) into rsi of hello_world data
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mov rdx, 14
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//size_t count excluding null terminator
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syscall
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//exit call
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mov rax, 60
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mov rdi, 33
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//return result (must be "rdi" not "rdx" - how are these registers named?)
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syscall
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//apprently int 80h interrupt is also syscall?
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hello_world:
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.asciz "Hello, World!\n"
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