1 /*
2 * Copyright (c) 2000-2013 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 * Copyright (C) 1990, NeXT, Inc.
30 *
31 * File: next/kern_machdep.c
32 * Author: John Seamons
33 *
34 * Machine-specific kernel routines.
35 */
36
37 #include <sys/types.h>
38 #include <mach/machine.h>
39 #include <kern/cpu_number.h>
40 #include <machine/exec.h>
41 #include <machine/machine_routines.h>
42
43 #if __x86_64__
44 extern int bootarg_no32exec; /* bsd_init.c */
45 #endif
46
47 /**********************************************************************
48 * Routine: grade_binary()
49 *
50 * Function: Say OK to CPU types that we can actually execute on the given
51 * system. 64-bit binaries have the highest preference, followed
52 * by 32-bit binaries. 0 means unsupported.
53 **********************************************************************/
54 int
grade_binary(cpu_type_t exectype,cpu_subtype_t execsubtype,cpu_subtype_t execfeatures __unused,bool allow_simulator_binary __unused)55 grade_binary(cpu_type_t exectype, cpu_subtype_t execsubtype, cpu_subtype_t execfeatures __unused, bool allow_simulator_binary __unused)
56 {
57 cpu_subtype_t hostsubtype = cpu_subtype();
58
59 switch (exectype) {
60 case CPU_TYPE_X86_64: /* native 64-bit */
61 switch (hostsubtype) {
62 case CPU_SUBTYPE_X86_64_H: /* x86_64h can execute anything */
63 switch (execsubtype) {
64 case CPU_SUBTYPE_X86_64_H:
65 return 3;
66 case CPU_SUBTYPE_X86_64_ALL:
67 return 2;
68 }
69 break;
70 case CPU_SUBTYPE_X86_ARCH1: /* generic systems can only execute ALL subtype */
71 switch (execsubtype) {
72 case CPU_SUBTYPE_X86_64_ALL:
73 return 2;
74 }
75 break;
76 }
77 break;
78 case CPU_TYPE_X86: /* native */
79 #if __x86_64__
80 if (bootarg_no32exec && !allow_simulator_binary) {
81 return 0;
82 }
83 #endif
84 return 1;
85 }
86
87 return 0;
88 }
89