The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_access.c

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    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
   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  Software.Distribution@CS.CMU.EDU
   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 the
   24  * rights to redistribute these changes.
   25  */
   26 /*
   27  *      Author: David B. Golub, Carnegie Mellon University
   28  *      Date:   7/90
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD: releng/10.1/sys/ddb/db_access.c 153072 2005-12-04 02:12:43Z ru $");
   33 
   34 #include <sys/param.h>
   35 #include <sys/kdb.h>
   36 
   37 #include <ddb/ddb.h>
   38 #include <ddb/db_access.h>
   39 
   40 /*
   41  * Access unaligned data items on aligned (longword)
   42  * boundaries.
   43  */
   44 
   45 static unsigned db_extend[] = { /* table for sign-extending */
   46         0,
   47         0xFFFFFF80U,
   48         0xFFFF8000U,
   49         0xFF800000U
   50 };
   51 
   52 #ifndef BYTE_MSF
   53 #define BYTE_MSF        0
   54 #endif
   55 
   56 db_expr_t
   57 db_get_value(addr, size, is_signed)
   58         db_addr_t       addr;
   59         register int    size;
   60         boolean_t       is_signed;
   61 {
   62         char            data[sizeof(u_int64_t)];
   63         register db_expr_t value;
   64         register int    i;
   65 
   66         if (db_read_bytes(addr, size, data) != 0) {
   67                 db_printf("*** error reading from address %llx ***\n",
   68                     (long long)addr);
   69                 kdb_reenter();
   70         }
   71 
   72         value = 0;
   73 #if     BYTE_MSF
   74         for (i = 0; i < size; i++)
   75 #else   /* BYTE_LSF */
   76         for (i = size - 1; i >= 0; i--)
   77 #endif
   78         {
   79             value = (value << 8) + (data[i] & 0xFF);
   80         }
   81 
   82         if (size < 4) {
   83             if (is_signed && (value & db_extend[size]) != 0)
   84                 value |= db_extend[size];
   85         }
   86         return (value);
   87 }
   88 
   89 void
   90 db_put_value(addr, size, value)
   91         db_addr_t       addr;
   92         register int    size;
   93         register db_expr_t value;
   94 {
   95         char            data[sizeof(int)];
   96         register int    i;
   97 
   98 #if     BYTE_MSF
   99         for (i = size - 1; i >= 0; i--)
  100 #else   /* BYTE_LSF */
  101         for (i = 0; i < size; i++)
  102 #endif
  103         {
  104             data[i] = value & 0xFF;
  105             value >>= 8;
  106         }
  107 
  108         if (db_write_bytes(addr, size, data) != 0) {
  109                 db_printf("*** error writing to address %llx ***\n",
  110                     (long long)addr);
  111                 kdb_reenter();
  112         }
  113 }

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