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/5.2/sys/ddb/db_access.c 118822 2003-08-12 13:24:21Z harti $");
   33 
   34 #include <sys/param.h>
   35 
   36 #include <ddb/ddb.h>
   37 #include <ddb/db_access.h>
   38 
   39 /*
   40  * Access unaligned data items on aligned (longword)
   41  * boundaries.
   42  */
   43 
   44 static unsigned db_extend[] = { /* table for sign-extending */
   45         0,
   46         0xFFFFFF80U,
   47         0xFFFF8000U,
   48         0xFF800000U
   49 };
   50 
   51 db_expr_t
   52 db_get_value(addr, size, is_signed)
   53         db_addr_t       addr;
   54         register int    size;
   55         boolean_t       is_signed;
   56 {
   57         char            data[sizeof(u_int64_t)];
   58         register db_expr_t value;
   59         register int    i;
   60 
   61         db_read_bytes(addr, size, data);
   62 
   63         value = 0;
   64 #if     BYTE_MSF
   65         for (i = 0; i < size; i++)
   66 #else   /* BYTE_LSF */
   67         for (i = size - 1; i >= 0; i--)
   68 #endif
   69         {
   70             value = (value << 8) + (data[i] & 0xFF);
   71         }
   72 
   73         if (size < 4) {
   74             if (is_signed && (value & db_extend[size]) != 0)
   75                 value |= db_extend[size];
   76         }
   77         return (value);
   78 }
   79 
   80 void
   81 db_put_value(addr, size, value)
   82         db_addr_t       addr;
   83         register int    size;
   84         register db_expr_t value;
   85 {
   86         char            data[sizeof(int)];
   87         register int    i;
   88 
   89 #if     BYTE_MSF
   90         for (i = size - 1; i >= 0; i--)
   91 #else   /* BYTE_LSF */
   92         for (i = 0; i < size; i++)
   93 #endif
   94         {
   95             data[i] = value & 0xFF;
   96             value >>= 8;
   97         }
   98 
   99         db_write_bytes(addr, size, data);
  100 }
  101

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

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