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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /*
26: * Copyright (c) 1992 NeXT Computer, Inc.
27: *
28: * Selector value conversion/validation.
29: *
30: * HISTORY
31: *
32: * 19 June 1992 ? at NeXT
33: * Created.
34: */
35:
36: #import <machdep/i386/table_inline.h>
37:
38: static inline
39: unsigned int
40: sel_to_selector(
41: sel_t sel
42: )
43: {
44: union {
45: sel_t sel;
46: unsigned short selector;
47: } tconv;
48:
49: tconv.sel = sel;
50:
51: return (tconv.selector);
52: }
53:
54: static inline
55: sel_t
56: selector_to_sel(
57: unsigned int selector
58: )
59: {
60: union {
61: unsigned short selector;
62: sel_t sel;
63: } tconv;
64:
65: tconv.selector = selector;
66:
67: return (tconv.sel);
68: }
69:
70: static inline
71: boolean_t
72: valid_user_data_selector(
73: unsigned int selector
74: )
75: {
76: sel_t sel = selector_to_sel(selector);
77:
78: if (selector == 0)
79: return (TRUE);
80:
81: if (sel.ti == SEL_LDT)
82: return (TRUE);
83: else if (sel.index < GDTSZ) {
84: data_desc_t *desc = (data_desc_t *)sel_to_gdt_entry(sel);
85:
86: if (desc->dpl == USER_PRIV)
87: return (TRUE);
88: }
89:
90: return (FALSE);
91: }
92:
93: static inline
94: boolean_t
95: valid_user_code_selector(
96: unsigned int selector
97: )
98: {
99: sel_t sel = selector_to_sel(selector);
100:
101: if (selector == 0)
102: return (FALSE);
103:
104: if (sel.ti == SEL_LDT) {
105: if (sel.rpl == USER_PRIV)
106: return (TRUE);
107: }
108: else if (sel.index < GDTSZ && sel.rpl == USER_PRIV) {
109: code_desc_t *desc = (code_desc_t *)sel_to_gdt_entry(sel);
110:
111: if (desc->dpl == USER_PRIV)
112: return (TRUE);
113: }
114:
115: return (FALSE);
116: }
117:
118: static inline
119: boolean_t
120: valid_user_stack_selector(
121: unsigned int selector
122: )
123: {
124: sel_t sel = selector_to_sel(selector);
125:
126: if (selector == 0)
127: return (FALSE);
128:
129: if (sel.ti == SEL_LDT) {
130: if (sel.rpl == USER_PRIV)
131: return (TRUE);
132: }
133: else if (sel.index < GDTSZ && sel.rpl == USER_PRIV) {
134: data_desc_t *desc = (data_desc_t *)sel_to_gdt_entry(sel);
135:
136: if (desc->dpl == USER_PRIV)
137: return (TRUE);
138: }
139:
140: return (FALSE);
141: }
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