bsd/dev/i386/kern_machdep.c

   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
  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 }