asmsh/child.s

.file "child64.s"

.section .text
.global _start

_start:
	mov $0x9, %rax # MMAP
	xor %rdi, %rdi
	mov $0x1000, %rsi # 1 page map
	mov $(0x1|0x2), %rdx # PROT_READ | PROT_WRITE
	mov $(0x20 | 0x1), %r10 # MAP_ANONYMOUS | MAP_SHARED
	mov $-1, %r8 # fd
	xor %r9, %r9
	syscall

	cmp $0, %rax
	jle .errmap

	push %rax
	xor %rax, %rax
	push %rax


	mov $-1, %r15
	mov $34, %rax # sys_pause
	syscall

	jmp *(%rsp)

	mov $60, %rax
	xor %rdi, %rdi
	syscall

	.errmap:
		mov $60, %rax # sys_exit
		mov $1, %rdi
		syscall