Home | History | Annotate | Line # | Download | only in powerpc 
      1 /*	$NetBSD: db_memrw.c,v 1.9 2005/12/11 12:18:46 christos Exp $	*/
      2 /*	$OpenBSD: db_memrw.c,v 1.2 1996/12/28 06:21:52 rahnds Exp $	*/
      3 
      4 /*
      5  * Mach Operating System
      6  * Copyright (c) 1992 Carnegie Mellon University
      7  * All Rights Reserved.
      8  *
      9  * Permission to use, copy, modify and distribute this software and its
     10  * documentation is hereby granted, provided that both the copyright
     11  * notice and this permission notice appear in all copies of the
     12  * software, derivative works or modified versions, and any portions
     13  * thereof, and that both notices appear in supporting documentation.
     14  *
     15  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     16  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     17  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     18  *
     19  * Carnegie Mellon requests users of this software to return to
     20  *
     21  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     22  *  School of Computer Science
     23  *  Carnegie Mellon University
     24  *  Pittsburgh PA 15213-3890
     25  *
     26  * any improvements or extensions that they make and grant Carnegie Mellon
     27  * the rights to redistribute these changes.
     28  */
     29 
     30 /*
     31  * Interface to the debugger for virtual memory read/write.
     32  * This is a simple version for kernels with writable text.
     33  * For an example of read-only kernel text, see the file:
     34  * sys/arch/sun3/sun3/db_memrw.c
     35  *
     36  * ALERT!  If you want to access device registers with a
     37  * specific size, then the read/write functions have to
     38  * make sure to do the correct sized pointer access.
     39  */
     40 
     41 #include <sys/cdefs.h>
     42 __KERNEL_RCSID(0, "$NetBSD: db_memrw.c,v 1.9 2005/12/11 12:18:46 christos Exp $");
     43 
     44 #include <sys/param.h>
     45 #include <sys/proc.h>
     46 
     47 #include <uvm/uvm_extern.h>
     48 
     49 #include <machine/db_machdep.h>
     50 
     51 #include <ddb/db_access.h>
     52 
     53 /*
     54  * Read bytes from kernel address space for debugger.
     55  */
     56 void
     57 db_read_bytes(vaddr_t addr, size_t size, char *data)
     58 {
     59 	char	*src = (char*)addr;
     60 
     61 	if (size == 4) {
     62 		*((int*)data) = *((int*)src);
     63 		return;
     64 	}
     65 
     66 	if (size == 2) {
     67 		*((short*)data) = *((short*)src);
     68 		return;
     69 	}
     70 
     71 	while (size > 0) {
     72 		--size;
     73 		*data++ = *src++;
     74 	}
     75 }
     76 
     77 /*
     78  * Write bytes to kernel address space for debugger.
     79  */
     80 void
     81 db_write_bytes(vaddr_t addr, size_t size, const char *data)
     82 {
     83 	char *dst = (char *)addr;
     84 
     85 	if (size == 4) {
     86 
     87 		*((int*)dst) = *((const int*)data);
     88 
     89 	} else 	if (size == 2) {
     90 
     91 		*((short*)dst) = *((const short*)data);
     92 
     93 	} else {
     94 
     95 		while (size > 0) {
     96 			--size;
     97 			*dst++ = *data++;
     98 		}
     99 
    100 	}
    101 
    102 	__syncicache((void *)addr, size);
    103 }
    104