1 /*
2 * Copyright (c) 2024 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28
29 #if DEVELOPMENT || DEBUG
30
31 #include <kern/bits.h>
32
33 static int
sysctl_test_memmove(__unused int64_t in,__unused int64_t * out)34 sysctl_test_memmove(__unused int64_t in, __unused int64_t *out)
35 {
36 // Ensure our platform-specific memmove implements correct semantics
37 extern void *__xnu_memmove(
38 void *dst __sized_by(n),
39 const void *src __sized_by(n),
40 size_t n) __asm("_memmove");
41
42 // Given two buffers
43 int dest = 0;
44 int source = 42;
45 // When I call our platform-specific memmove implementation
46 void* memmove_ret = __xnu_memmove(&dest, &source, sizeof(int));
47 // Then the value of `src` has been copied to `dst`
48 if (dest != 42) {
49 return KERN_FAILURE;
50 }
51 // And `src` is unmodified
52 if (source != 42) {
53 return KERN_FAILURE;
54 }
55 // And the return value is the `dest` pointer we passed in
56 if (memmove_ret != &dest) {
57 return KERN_FAILURE;
58 }
59 return KERN_SUCCESS;
60 }
61
62 SYSCTL_TEST_REGISTER(test_memmove, sysctl_test_memmove);
63
64 #endif /* DEBUG || DEVELOPMENT */
65