projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 1c79356b | 1 | /* |
| 5d5c5d0d A |
2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. |
| 3 | * | |
| 8f6c56a5 | 4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
| 1c79356b | 5 | * |
| 8f6c56a5 A |
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 | |
| 8ad349bb | 24 | * limitations under the License. |
| 8f6c56a5 A |
25 | * |
| 26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ | |
| 1c79356b A |
27 | */ |
| 28 | /* | |
| 29 | * Copyright (c) 1992 NeXT Computer, Inc. | |
| 30 | * | |
| 31 | * Selector value conversion/validation. | |
| 32 | * | |
| 33 | * HISTORY | |
| 34 | * | |
| 35 | * 19 June 1992 ? at NeXT | |
| 36 | * Created. | |
| 37 | */ | |
| 38 | ||
| 39 | ||
| 40 | static inline | |
| 41 | unsigned int | |
| 42 | sel_to_selector( | |
| 43 | sel_t sel | |
| 44 | ) | |
| 45 | { | |
| 46 | union { | |
| 47 | sel_t sel; | |
| 48 | unsigned short selector; | |
| 49 | } tconv; | |
| 50 | ||
| 51 | tconv.sel = sel; | |
| 52 | ||
| 53 | return (tconv.selector); | |
| 54 | } | |
| 55 | ||
| 56 | static inline | |
| 57 | sel_t | |
| 58 | selector_to_sel( | |
| 59 | unsigned int selector | |
| 60 | ) | |
| 61 | { | |
| 62 | union { | |
| 63 | unsigned short selector; | |
| 64 | sel_t sel; | |
| 65 | } tconv; | |
| 66 | ||
| 67 | tconv.selector = selector; | |
| 68 | ||
| 69 | return (tconv.sel); | |
| 70 | } | |
| 71 | ||
| 72 | #if 0 | |
| 73 | static inline | |
| 74 | boolean_t | |
| 75 | valid_user_data_selector( | |
| 76 | unsigned int selector | |
| 77 | ) | |
| 78 | { | |
| 79 | sel_t sel = selector_to_sel(selector); | |
| 80 | ||
| 81 | if (selector == 0) | |
| 82 | return (TRUE); | |
| 83 | ||
| 84 | if (sel.ti == SEL_LDT) | |
| 85 | return (TRUE); | |
| 86 | else if (sel.index < GDTSZ) { | |
| 87 | data_desc_t *desc = (data_desc_t *)sel_to_gdt_entry(sel); | |
| 88 | ||
| 89 | if (desc->dpl == USER_PRIV) | |
| 90 | return (TRUE); | |
| 91 | } | |
| 92 | ||
| 93 | return (FALSE); | |
| 94 | } | |
| 95 | ||
| 96 | static inline | |
| 97 | boolean_t | |
| 98 | valid_user_code_selector( | |
| 99 | unsigned int selector | |
| 100 | ) | |
| 101 | { | |
| 102 | sel_t sel = selector_to_sel(selector); | |
| 103 | ||
| 104 | if (selector == 0) | |
| 105 | return (FALSE); | |
| 106 | ||
| 107 | if (sel.ti == SEL_LDT) { | |
| 108 | if (sel.rpl == USER_PRIV) | |
| 109 | return (TRUE); | |
| 110 | } | |
| 111 | else if (sel.index < GDTSZ && sel.rpl == USER_PRIV) { | |
| 112 | code_desc_t *desc = (code_desc_t *)sel_to_gdt_entry(sel); | |
| 113 | ||
| 114 | if (desc->dpl == USER_PRIV) | |
| 115 | return (TRUE); | |
| 116 | } | |
| 117 | ||
| 118 | return (FALSE); | |
| 119 | } | |
| 120 | ||
| 121 | static inline | |
| 122 | boolean_t | |
| 123 | valid_user_stack_selector( | |
| 124 | unsigned int selector | |
| 125 | ) | |
| 126 | { | |
| 127 | sel_t sel = selector_to_sel(selector); | |
| 128 | ||
| 129 | if (selector == 0) | |
| 130 | return (FALSE); | |
| 131 | ||
| 132 | if (sel.ti == SEL_LDT) { | |
| 133 | if (sel.rpl == USER_PRIV) | |
| 134 | return (TRUE); | |
| 135 | } | |
| 136 | else if (sel.index < GDTSZ && sel.rpl == USER_PRIV) { | |
| 137 | data_desc_t *desc = (data_desc_t *)sel_to_gdt_entry(sel); | |
| 138 | ||
| 139 | if (desc->dpl == USER_PRIV) | |
| 140 | return (TRUE); | |
| 141 | } | |
| 142 | ||
| 143 | return (FALSE); | |
| 144 | } | |
| 145 | #endif |