Added some more ASM languages and Squirrel.

a/assembler_nasm_freebsd.asm

@@ -0,0 +1,31 @@
+section	.text
+    global _start			;must be declared for linker (ld)
+
+_syscall:		
+	int	0x80		;system call
+	ret
+
+_start:				;tell linker entry point
+
+	push	dword len	;message length
+	push	dword msg	;message to write
+	push	dword 1		;file descriptor (stdout)
+	mov	eax,0x4		;system call number (sys_write)
+	call	_syscall	;call kernel
+
+				;the alternate way to call kernel:
+				;push	eax
+				;call	7:0
+
+	add	esp,12		;clean stack (3 arguments * 4)
+
+	push	dword 0		;exit code
+	mov	eax,0x1		;system call number (sys_exit)
+	call	_syscall	;call kernel
+
+				;we do not return from sys_exit,
+				;there's no need to clean stack
+section	.data
+
+msg	db	"Hello, world!",0xa	;our string
+len	equ	$ - msg			;length of our string