.global user_exec
user_exec:
	
	sub sp, sp, 36 * 8
	mov x1, x0
	mov x0, sp
	mov x2, 36 * 8
	bl memcpy

	ldp lr, x0,   [sp, 16 * 15]
	ldp x1, x2,   [sp, 16 * 16]
	ldr x3,       [sp, 16 * 17]
	msr spsr_el1, x0
	msr elr_el1,  x1
	msr esr_el1,  x2
	msr sp_el0,   x3

	ldp x0, x1,   [sp, 16 * 0]
	ldp x2, x3,   [sp, 16 * 1]
	ldp x4, x5,   [sp, 16 * 2]
	ldp x6, x7,   [sp, 16 * 3]
	ldp x8, x9,   [sp, 16 * 4]
	ldp x10, x11, [sp, 16 * 5]
	ldp x12, x13, [sp, 16 * 6]
	ldp x14, x15, [sp, 16 * 7]
	ldp x16, x17, [sp, 16 * 8]
	ldp x18, x19, [sp, 16 * 9]
	ldp x20, x21, [sp, 16 * 10]
	ldp x22, x23, [sp, 16 * 11]
	ldp x24, x25, [sp, 16 * 12]
	ldp x26, x27, [sp, 16 * 13]
	ldp x28, fp,  [sp, 16 * 14]

	add sp, sp, 36 * 8

	eret