Return to sel_inline.h CVS log

Up to [Apple Darwin 0.x] / kernel / machdep / i386

Annotation of kernel/machdep/i386/sel_inline.h, revision 1.1

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: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.