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Annotation of XNU/osfmk/ddb/db_access.c, revision 1.1

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:  * @OSF_COPYRIGHT@
        !            24:  */
        !            25: /* 
        !            26:  * Mach Operating System
        !            27:  * Copyright (c) 1991,1990 Carnegie Mellon University
        !            28:  * All Rights Reserved.
        !            29:  * 
        !            30:  * Permission to use, copy, modify and distribute this software and its
        !            31:  * documentation is hereby granted, provided that both the copyright
        !            32:  * notice and this permission notice appear in all copies of the
        !            33:  * software, derivative works or modified versions, and any portions
        !            34:  * thereof, and that both notices appear in supporting documentation.
        !            35:  * 
        !            36:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            37:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            38:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            39:  * 
        !            40:  * Carnegie Mellon requests users of this software to return to
        !            41:  * 
        !            42:  *  Software Distribution Coordinator  or  [email protected]
        !            43:  *  School of Computer Science
        !            44:  *  Carnegie Mellon University
        !            45:  *  Pittsburgh PA 15213-3890
        !            46:  * 
        !            47:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            48:  * the rights to redistribute these changes.
        !            49:  */
        !            50: /*
        !            51:  */
        !            52: /*
        !            53:  *     Author: David B. Golub, Carnegie Mellon University
        !            54:  *     Date:   7/90
        !            55:  */
        !            56: #include <mach/boolean.h>
        !            57: #include <machine/db_machdep.h>                /* type definitions */
        !            58: #include <machine/setjmp.h>
        !            59: #include <machine/endian.h>
        !            60: #include <kern/task.h>
        !            61: #include <ddb/db_access.h>
        !            62: 
        !            63: 
        !            64: 
        !            65: /*
        !            66:  * Access unaligned data items on aligned (longword)
        !            67:  * boundaries.
        !            68:  */
        !            69: 
        !            70: int db_access_level = DB_ACCESS_LEVEL;
        !            71: 
        !            72: /*
        !            73:  * This table is for sign-extending things.
        !            74:  * Therefore its entries are signed, and yes
        !            75:  * they are in fact negative numbers.
        !            76:  * So don't put Us in it. Or Ls either.
        !            77:  * Otherwise there is no point having it, n'est pas ?
        !            78:  */
        !            79: static int db_extend[sizeof(long)+1] = { /* table for sign-extending */
        !            80: #if defined(__arch64__)
        !            81:        0,
        !            82:        0xFFFFFFFFFFFFFF80,
        !            83:        0xFFFFFFFFFFFF8000,
        !            84:        0xFFFFFFFFFF800000,
        !            85:        0xFFFFFFFF80000000,
        !            86:        0xFFFFFF8000000000,
        !            87:        0xFFFF800000000000,
        !            88:        0xFF80000000000000,
        !            89:        0x8000000000000000,
        !            90: #else /* !defined(__arch64__) */
        !            91:        0,
        !            92:        0xFFFFFF80,
        !            93:        0xFFFF8000,
        !            94:        0xFF800000,
        !            95:        0x80000000
        !            96: #endif /* defined(__arch64__) */
        !            97: };
        !            98: 
        !            99: db_expr_t
        !           100: db_get_task_value(
        !           101:        db_addr_t       addr,
        !           102:        register int    size,
        !           103:        boolean_t       is_signed,
        !           104:        task_t          task)
        !           105: {
        !           106:        char            data[sizeof(db_expr_t)];
        !           107:        register db_expr_t value;
        !           108:        register int    i;
        !           109: 
        !           110:        db_read_bytes((vm_offset_t)addr, size, data, task);
        !           111: 
        !           112:        value = 0;
        !           113: #if    BYTE_MSF
        !           114:        for (i = 0; i < size; i++)
        !           115: #else  /* BYTE_LSF */
        !           116:        for (i = size - 1; i >= 0; i--)
        !           117: #endif
        !           118:        {
        !           119:            value = (value << 8) + (data[i] & 0xFF);
        !           120:        }
        !           121:            
        !           122:        if (size <= sizeof(int)) {
        !           123:            if (is_signed && (value & db_extend[size]) != 0)
        !           124:                value |= db_extend[size];
        !           125:        }
        !           126:        return (value);
        !           127: }
        !           128: 
        !           129: void
        !           130: db_put_task_value(
        !           131:        db_addr_t       addr,
        !           132:        register int    size,
        !           133:        register db_expr_t value,
        !           134:        task_t          task)
        !           135: {
        !           136:        char            data[sizeof(db_expr_t)];
        !           137:        register int    i;
        !           138: 
        !           139: #if    BYTE_MSF
        !           140:        for (i = size - 1; i >= 0; i--)
        !           141: #else  /* BYTE_LSF */
        !           142:        for (i = 0; i < size; i++)
        !           143: #endif
        !           144:        {
        !           145:            data[i] = value & 0xFF;
        !           146:            value >>= 8;
        !           147:        }
        !           148: 
        !           149:        db_write_bytes((vm_offset_t)addr, size, data, task);
        !           150: }
        !           151: 
        !           152: db_expr_t
        !           153: db_get_value(
        !           154:        db_addr_t       addr,
        !           155:        int             size,
        !           156:        boolean_t       is_signed)
        !           157: {
        !           158:        return(db_get_task_value(addr, size, is_signed, TASK_NULL));
        !           159: }
        !           160: 
        !           161: void
        !           162: db_put_value(
        !           163:        db_addr_t       addr,
        !           164:        int             size,
        !           165:        db_expr_t       value)
        !           166: {
        !           167:        db_put_task_value(addr, size, value, TASK_NULL);
        !           168: }

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