db_memrw.c

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    1 /*      $FreeBSD: releng/5.2/sys/powerpc/powerpc/db_memrw.c 104435 2002-10-04 01:19:18Z grehan $ */
    2 /*      $NetBSD: db_memrw.c,v 1.5 2001/12/27 10:25:41 dbj Exp $ */
    3 /*      $OpenBSD: db_memrw.c,v 1.2 1996/12/28 06:21:52 rahnds Exp $     */
    4 
    5 /* 
    6  * Mach Operating System
    7  * Copyright (c) 1992 Carnegie Mellon University
    8  * All Rights Reserved.
    9  * 
   10  * Permission to use, copy, modify and distribute this software and its
   11  * documentation is hereby granted, provided that both the copyright
   12  * notice and this permission notice appear in all copies of the
   13  * software, derivative works or modified versions, and any portions
   14  * thereof, and that both notices appear in supporting documentation.
   15  * 
   16  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   17  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   18  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   19  * 
   20  * Carnegie Mellon requests users of this software to return to
   21  * 
   22  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   23  *  School of Computer Science
   24  *  Carnegie Mellon University
   25  *  Pittsburgh PA 15213-3890
   26  * 
   27  * any improvements or extensions that they make and grant Carnegie Mellon 
   28  * the rights to redistribute these changes.
   29  */
   30 
   31 /*
   32  * Interface to the debugger for virtual memory read/write.
   33  * This is a simple version for kernels with writable text.
   34  * For an example of read-only kernel text, see the file:
   35  * sys/arch/sun3/sun3/db_memrw.c
   36  *
   37  * ALERT!  If you want to access device registers with a
   38  * specific size, then the read/write functions have to
   39  * make sure to do the correct sized pointer access.
   40  */
   41 
   42 #include <sys/param.h>
   43 #include <sys/proc.h>
   44 
   45 #include <vm/vm.h>
   46 #include <vm/vm_extern.h>
   47 
   48 #include <machine/db_machdep.h>
   49 
   50 #include <ddb/ddb.h>
   51 
   52 /*
   53  * Read bytes from kernel address space for debugger.
   54  */
   55 void
   56 db_read_bytes(addr, size, data)
   57         vm_offset_t     addr;
   58         register size_t size;
   59         register char   *data;
   60 {
   61         register char   *src = (char*)addr;
   62 
   63         if (size == 4) {
   64                 *((int*)data) = *((int*)src);
   65                 return;
   66         }
   67 
   68         if (size == 2) {
   69                 *((short*)data) = *((short*)src);
   70                 return;
   71         }
   72 
   73         while (size > 0) {
   74                 --size;
   75                 *data++ = *src++;
   76         }
   77 }
   78 
   79 /*
   80  * Write bytes to kernel address space for debugger.
   81  */
   82 void
   83 db_write_bytes(addr, size, data)
   84         vm_offset_t     addr;
   85         register size_t size;
   86         register char   *data;
   87 {
   88         register char   *dst = (char *)addr;
   89 
   90         if (size == 4) {
   91 
   92                 *((int*)dst) = *((int*)data);
   93 
   94         } else  if (size == 2) {
   95 
   96                 *((short*)dst) = *((short*)data);
   97 
   98         } else {
   99 
  100                 while (size > 0) {
  101                         --size;
  102                         *dst++ = *data++;
  103                 }
  104 
  105         }
  106 
  107         __syncicache((void *)addr, size);
  108 }
  109

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FreeBSD/Linux Kernel Cross Reference sys/powerpc/powerpc/db_memrw.c

FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powerpc/db_memrw.c