[BREAKING] Simplify URL paths

content/drafts/assembly.md

@@ -0,0 +1,47 @@
+---
+tags:
+  - computer-science
+  - notes
+author: TrudeEH
+draft: true
+showToc: true
+title: Assembly
+---
+
+#todo
+
+## Assembler/Compiler
+
+- `gcc` GNU C Compiler (The package includes `as` (assembler) and `ld` (linker))
+
+```Shell
+as <file.asm> -o <output.o> # Assemble
+gcc -o <output_file> <output.o> -nostdlib -static # Link using gcc
+ld <output.o> # Link using ld
+```
+
+## Hello World
+
+```Assembly
+.global _start
+.intel_syntax noprefix
+_start:
+	// sys_write (Print to stdout)
+	mov rax, 1
+	mov rdi, 1
+	lea rsi, [hello_world]
+	// Buffer length
+	mov rdx, 14
+	syscall
+	// sys_exit (safely end the program with a re turn code)
+	mov rax, 60
+	// Exit with code 0
+	mov rdi, 0
+	syscall
+	
+hello_world:
+	// ASCII, zero delimited
+	.asciz "Hello, World!\n"
+```
+
+To know which system calls we can execute and which values needed for the registers, refer to [this table](https://blog.rchapman.org/posts/Linux_System_Call_Table_for_x86_64/).