; safe_64.asm   for testing protections within sections
; Assemble:	nasm -f elf64  safe_64.asm
; Link:		gcc -o safe_64  safe_64.o
; Run:		./safe_64
; Output:
; it should stop with a system caught error

        global main		; the standard gcc entry point
        extern	printf		; the C function, to be called

        section .rodata		; read only data section, constants
a:	dq	5		; long int a=5;
fmt:    db "Bad, still running",10,0


        section .text           ; Code section. not writeable
main:				; the program label for the entry point
        push    rbp		; set up stack frame

	mov	rax,0x789abcde
	mov	[a],rax		; should be error, read only section
        mov	rdi,fmt		; address of format string
	mov	rax,0
	call	printf

        pop     rbp
	mov	rax,0		; normal, no error, return value
	ret			; return