You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
31 lines
765 B
NASM
31 lines
765 B
NASM
11 months ago
|
|
||
|
|
.global _start
|
||
|
|
//exposes a symbol called start to the assembler
|
||
|
|
.intel_syntax noprefix
|
||
|
|
|
||
|
|
//See: https://www.youtube.com/watch?v=6S5KRJv-7RU
|
||
|
|
//See: https://blog.rchapman.org/posts/Linux_System_Call_Table_for_x86_64/
|
||
|
|
|
||
|
|
_start:
|
||
|
|
//write call (sys_write)
|
||
|
|
mov rax,1
|
||
|
|
//sys_write system call
|
||
|
|
mov rdi, 1
|
||
|
|
//unsigned int fd = 1 (stdout)
|
||
|
|
lea rsi,[hello_world]
|
||
|
|
//load effective address (lea) into rsi of hello_world data
|
||
|
|
mov rdx, 14
|
||
|
|
//size_t count excluding null terminator
|
||
|
|
syscall
|
||
|
|
|
||
|
|
//exit call
|
||
|
|
mov rax, 60
|
||
|
|
mov rdi, 33
|
||
|
|
//return result (must be "rdi" not "rdx" - how are these registers named?)
|
||
|
|
syscall
|
||
|
|
//apprently int 80h interrupt is also syscall?
|
||
|
|
|
||
|
|
hello_world:
|
||
|
|
.asciz "Hello, World!\n"
|
||
|
|
|