1*043036a2SApple OSS Distributions /*
2*043036a2SApple OSS Distributions * Copyright (c) 2025 Apple Computer, Inc. All rights reserved.
3*043036a2SApple OSS Distributions *
4*043036a2SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5*043036a2SApple OSS Distributions *
6*043036a2SApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code
7*043036a2SApple OSS Distributions * as defined in and that are subject to the Apple Public Source License
8*043036a2SApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in
9*043036a2SApple OSS Distributions * compliance with the License. The rights granted to you under the License
10*043036a2SApple OSS Distributions * may not be used to create, or enable the creation or redistribution of,
11*043036a2SApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to
12*043036a2SApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any
13*043036a2SApple OSS Distributions * terms of an Apple operating system software license agreement.
14*043036a2SApple OSS Distributions *
15*043036a2SApple OSS Distributions * Please obtain a copy of the License at
16*043036a2SApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file.
17*043036a2SApple OSS Distributions *
18*043036a2SApple OSS Distributions * The Original Code and all software distributed under the License are
19*043036a2SApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20*043036a2SApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21*043036a2SApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22*043036a2SApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23*043036a2SApple OSS Distributions * Please see the License for the specific language governing rights and
24*043036a2SApple OSS Distributions * limitations under the License.
25*043036a2SApple OSS Distributions *
26*043036a2SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27*043036a2SApple OSS Distributions */
28*043036a2SApple OSS Distributions #include <mach/vm_param.h>
29*043036a2SApple OSS Distributions #include <stdint.h>
30*043036a2SApple OSS Distributions
31*043036a2SApple OSS Distributions #define _STR(X) #X
32*043036a2SApple OSS Distributions #define STR(X) _STR(X)
33*043036a2SApple OSS Distributions
34*043036a2SApple OSS Distributions void start() asm ("start");
35*043036a2SApple OSS Distributions
36*043036a2SApple OSS Distributions /*
37*043036a2SApple OSS Distributions * A library-free routine to return the number of bytes in a pointer. This
38*043036a2SApple OSS Distributions * allows us to test the kernel loader policy without having an external
39*043036a2SApple OSS Distributions * dependency on dyld and/or the presence of a slice in a library dependency
40*043036a2SApple OSS Distributions * (which it often does not, even if the kernel supports the policy).
41*043036a2SApple OSS Distributions *
42*043036a2SApple OSS Distributions * No C code. The stack is not guaranteed to be aligned yet.
43*043036a2SApple OSS Distributions */
44*043036a2SApple OSS Distributions __attribute__((naked, noreturn))
45*043036a2SApple OSS Distributions void
start()46*043036a2SApple OSS Distributions start()
47*043036a2SApple OSS Distributions {
48*043036a2SApple OSS Distributions /* exit(__WORDSIZE/8) */
49*043036a2SApple OSS Distributions asm volatile (
50*043036a2SApple OSS Distributions "mov x0, " STR(__WORDSIZE/8) "\n"
51*043036a2SApple OSS Distributions "mov x16, #1\n"
52*043036a2SApple OSS Distributions "svc #(" STR(SWI_SYSCALL) ")\n");
53*043036a2SApple OSS Distributions }
54