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Annotation of Gnu-Mach/ddb/db_access.c, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Mach Operating System
        !             3:  * Copyright (c) 1991,1990 Carnegie Mellon University
        !             4:  * All Rights Reserved.
        !             5:  * 
        !             6:  * Permission to use, copy, modify and distribute this software and its
        !             7:  * documentation is hereby granted, provided that both the copyright
        !             8:  * notice and this permission notice appear in all copies of the
        !             9:  * software, derivative works or modified versions, and any portions
        !            10:  * thereof, and that both notices appear in supporting documentation.
        !            11:  * 
        !            12:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            13:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            14:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            15:  * 
        !            16:  * Carnegie Mellon requests users of this software to return to
        !            17:  * 
        !            18:  *  Software Distribution Coordinator  or  [email protected]
        !            19:  *  School of Computer Science
        !            20:  *  Carnegie Mellon University
        !            21:  *  Pittsburgh PA 15213-3890
        !            22:  * 
        !            23:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            24:  * the rights to redistribute these changes.
        !            25:  */
        !            26: /*
        !            27:  *     Author: David B. Golub, Carnegie Mellon University
        !            28:  *     Date:   7/90
        !            29:  */
        !            30: #include "mach_kdb.h"
        !            31: #if MACH_KDB
        !            32: 
        !            33: #include <mach/boolean.h>
        !            34: #include <machine/db_machdep.h>                /* type definitions */
        !            35: #include <machine/setjmp.h>
        !            36: #include <kern/task.h>
        !            37: #include <ddb/db_access.h>
        !            38: 
        !            39: 
        !            40: 
        !            41: /*
        !            42:  * Access unaligned data items on aligned (longword)
        !            43:  * boundaries.
        !            44:  */
        !            45: 
        !            46: extern void    db_read_bytes();        /* machine-dependent */
        !            47: extern void    db_write_bytes();       /* machine-dependent */
        !            48: 
        !            49: int db_access_level = DB_ACCESS_LEVEL;
        !            50: 
        !            51: /*
        !            52:  * This table is for sign-extending things.
        !            53:  * Therefore its entries are signed, and yes
        !            54:  * they are infact negative numbers.
        !            55:  * So don't you put no more Us in it. Or Ls either.
        !            56:  * Otherwise there is no point having it, n'est pas ?
        !            57:  */
        !            58: static int db_extend[sizeof(int)+1] = {        /* table for sign-extending */
        !            59:        0,
        !            60:        0xFFFFFF80,
        !            61:        0xFFFF8000,
        !            62:        0xFF800000,
        !            63:        0x80000000
        !            64: };
        !            65: 
        !            66: db_expr_t
        !            67: db_get_task_value(addr, size, is_signed, task)
        !            68:        db_addr_t       addr;
        !            69:        register int    size;
        !            70:        boolean_t       is_signed;
        !            71:        task_t          task;
        !            72: {
        !            73:        char            data[sizeof(db_expr_t)];
        !            74:        register db_expr_t value;
        !            75:        register int    i;
        !            76: 
        !            77:        db_read_bytes((void*)addr, size, data, task);
        !            78: 
        !            79:        value = 0;
        !            80: #if    BYTE_MSF
        !            81:        for (i = 0; i < size; i++)
        !            82: #else  /* BYTE_LSF */
        !            83:        for (i = size - 1; i >= 0; i--)
        !            84: #endif
        !            85:        {
        !            86:            value = (value << 8) + (data[i] & 0xFF);
        !            87:        }
        !            88:            
        !            89:        if (size <= sizeof(int)) {
        !            90:            if (is_signed && (value & db_extend[size]) != 0)
        !            91:                value |= db_extend[size];
        !            92:        }
        !            93:        return (value);
        !            94: }
        !            95: 
        !            96: void
        !            97: db_put_task_value(addr, size, value, task)
        !            98:        db_addr_t       addr;
        !            99:        register int    size;
        !           100:        register db_expr_t value;
        !           101:        task_t          task;
        !           102: {
        !           103:        char            data[sizeof(db_expr_t)];
        !           104:        register int    i;
        !           105: 
        !           106: #if    BYTE_MSF
        !           107:        for (i = size - 1; i >= 0; i--)
        !           108: #else  /* BYTE_LSF */
        !           109:        for (i = 0; i < size; i++)
        !           110: #endif
        !           111:        {
        !           112:            data[i] = value & 0xFF;
        !           113:            value >>= 8;
        !           114:        }
        !           115: 
        !           116:        db_write_bytes((void*)addr, size, data, task);
        !           117: }
        !           118: 
        !           119: db_expr_t
        !           120: db_get_value(addr, size, is_signed)
        !           121:        db_addr_t       addr;
        !           122:        int             size;
        !           123:        boolean_t       is_signed;
        !           124: {
        !           125:        return(db_get_task_value(addr, size, is_signed, TASK_NULL));
        !           126: }
        !           127: 
        !           128: void
        !           129: db_put_value(addr, size, value)
        !           130:        db_addr_t       addr;
        !           131:        int             size;
        !           132:        db_expr_t       value;
        !           133: {
        !           134:        db_put_task_value(addr, size, value, TASK_NULL);
        !           135: }
        !           136: 
        !           137: #endif MACH_KDB

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