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      1 /*	$NetBSD: db_memrw.c,v 1.9 2008/06/07 03:25:13 uwe Exp $	*/
      2 
      3 /*
      4  * Mach Operating System
      5  * Copyright (c) 1991,1990 Carnegie Mellon University
      6  * All Rights Reserved.
      7  *
      8  * Permission to use, copy, modify and distribute this software and its
      9  * documentation is hereby granted, provided that both the copyright
     10  * notice and this permission notice appear in all copies of the
     11  * software, derivative works or modified versions, and any portions
     12  * thereof, and that both notices appear in supporting documentation.
     13  *
     14  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
     15  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     16  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     17  *
     18  * Carnegie Mellon requests users of this software to return to
     19  *
     20  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     21  *  School of Computer Science
     22  *  Carnegie Mellon University
     23  *  Pittsburgh PA 15213-3890
     24  *
     25  * any improvements or extensions that they make and grant Carnegie the
     26  * rights to redistribute these changes.
     27  *
     28  *	db_interface.c,v 2.4 1991/02/05 17:11:13 mrt (CMU)
     29  */
     30 
     31 /*
     32  * Routines to read and write memory on behalf of the debugger, used
     33  * by DDB and KGDB.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 __KERNEL_RCSID(0, "$NetBSD: db_memrw.c,v 1.9 2008/06/07 03:25:13 uwe Exp $");
     38 
     39 #include <sys/param.h>
     40 #include <sys/proc.h>
     41 #include <sys/systm.h>
     42 
     43 #include <uvm/uvm_extern.h>
     44 
     45 #include <sh3/cache.h>
     46 #include <machine/db_machdep.h>
     47 
     48 #include <ddb/db_access.h>
     49 
     50 /*
     51  * Read bytes from kernel address space for debugger.
     52  */
     53 void
     54 db_read_bytes(vaddr_t addr, size_t size, char *data)
     55 {
     56 	char *src = (char *)addr;
     57 
     58 	/* properly aligned 4-byte */
     59 	if (size == 4 && ((addr & 3) == 0) && (((uintptr_t)data & 3) == 0)) {
     60 		*(uint32_t *)data = *(uint32_t *)src;
     61 		return;
     62 	}
     63 
     64 	/* properly aligned 2-byte */
     65 	if (size == 2 && ((addr & 1) == 0) && (((uintptr_t)data & 1) == 0)) {
     66 		*(uint16_t *)data = *(uint16_t *)src;
     67 		return;
     68 	}
     69 
     70 	while (size-- > 0)
     71 		*data++ = *src++;
     72 }
     73 
     74 
     75 /*
     76  * Write bytes to kernel address space for debugger.
     77  * XXX: need support for writing to P3 read-only text pages.
     78  */
     79 void
     80 db_write_bytes(vaddr_t addr, size_t size, const char *data)
     81 {
     82 	char *dst = (char *)addr;
     83 
     84 	/* properly aligned 4-byte */
     85 	if (size == 4 && ((addr & 3) == 0) && (((uintptr_t)data & 3) == 0))
     86 		*(uint32_t *)dst = *(const uint32_t *)data;
     87 
     88 	/* properly aligned 2-byte */
     89 	else if (size == 2 && ((addr & 1) == 0) && (((uintptr_t)data & 1) == 0))
     90 		*(uint16_t *)dst = *(const uint16_t *)data;
     91 
     92 	else
     93 		while (size-- > 0)
     94 			*dst++ = *data++;
     95 
     96 	sh_icache_sync_all();
     97 }
     98