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1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * The contents of this file constitute Original Code as defined in and
7: * are subject to the Apple Public Source License Version 1.1 (the
8: * "License"). You may not use this file except in compliance with the
9: * License. Please obtain a copy of the License at
10: * http://www.apple.com/publicsource and read it before using this file.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17: * License for the specific language governing rights and limitations
18: * under the License.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22: /*
23: * Copyright (c) 1992 NeXT Computer, Inc.
24: *
25: * Selector value conversion/validation.
26: *
27: * HISTORY
28: *
29: * 19 June 1992 ? at NeXT
30: * Created.
31: */
32:
33: #if 0
34: #import <machdep/i386/table_inline.h>
35: #endif
36:
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: #if 0
71: static inline
72: boolean_t
73: valid_user_data_selector(
74: unsigned int selector
75: )
76: {
77: sel_t sel = selector_to_sel(selector);
78:
79: if (selector == 0)
80: return (TRUE);
81:
82: if (sel.ti == SEL_LDT)
83: return (TRUE);
84: else if (sel.index < GDTSZ) {
85: data_desc_t *desc = (data_desc_t *)sel_to_gdt_entry(sel);
86:
87: if (desc->dpl == USER_PRIV)
88: return (TRUE);
89: }
90:
91: return (FALSE);
92: }
93:
94: static inline
95: boolean_t
96: valid_user_code_selector(
97: unsigned int selector
98: )
99: {
100: sel_t sel = selector_to_sel(selector);
101:
102: if (selector == 0)
103: return (FALSE);
104:
105: if (sel.ti == SEL_LDT) {
106: if (sel.rpl == USER_PRIV)
107: return (TRUE);
108: }
109: else if (sel.index < GDTSZ && sel.rpl == USER_PRIV) {
110: code_desc_t *desc = (code_desc_t *)sel_to_gdt_entry(sel);
111:
112: if (desc->dpl == USER_PRIV)
113: return (TRUE);
114: }
115:
116: return (FALSE);
117: }
118:
119: static inline
120: boolean_t
121: valid_user_stack_selector(
122: unsigned int selector
123: )
124: {
125: sel_t sel = selector_to_sel(selector);
126:
127: if (selector == 0)
128: return (FALSE);
129:
130: if (sel.ti == SEL_LDT) {
131: if (sel.rpl == USER_PRIV)
132: return (TRUE);
133: }
134: else if (sel.index < GDTSZ && sel.rpl == USER_PRIV) {
135: data_desc_t *desc = (data_desc_t *)sel_to_gdt_entry(sel);
136:
137: if (desc->dpl == USER_PRIV)
138: return (TRUE);
139: }
140:
141: return (FALSE);
142: }
143: #endif
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