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      1 /*	$NetBSD: db_memrw.c,v 1.7 2009/11/03 05:07:26 snj Exp $	*/
      2 
      3 /*	$OpenBSD: db_interface.c,v 1.16 2001/03/22 23:31:45 mickey Exp $	*/
      4 
      5 /*
      6  * Copyright (c) 1999-2003 Michael Shalayeff
      7  * All rights reserved.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
     22  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     24  * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     26  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
     27  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     28  * THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include <sys/cdefs.h>
     32 __KERNEL_RCSID(0, "$NetBSD: db_memrw.c,v 1.7 2009/11/03 05:07:26 snj Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/systm.h>
     36 
     37 #include <machine/db_machdep.h>
     38 #include <machine/frame.h>
     39 #include <machine/cpufunc.h>
     40 
     41 #include <hppa/hppa/machdep.h>
     42 
     43 #include <ddb/db_access.h>
     44 
     45 void
     46 db_read_bytes(vaddr_t addr, size_t size, char *data)
     47 {
     48 	char *src = (char *)addr;
     49 
     50 	while (size--)
     51 		*data++ = *src++;
     52 }
     53 
     54 void
     55 db_write_bytes(vaddr_t addr, size_t size, const char *data)
     56 {
     57 	char *dst = (char *)addr;
     58 	extern int etext;
     59 
     60 	/*
     61 	 * Since (most of) the text segment is mapped unwritable,
     62 	 * (but directly), we need to use a special function when
     63 	 * dst is less than etext.
     64 	 */
     65 	while (size--) {
     66 		if (dst < (char *) &etext) {
     67 			hppa_ktext_stb((vaddr_t)dst, *data);
     68 			dst++;
     69 			data++;
     70 		} else
     71 			*dst++ = *data++;
     72 	}
     73 
     74 	fcacheall();
     75 	__asm volatile(
     76 			"	nop	\n"
     77 			"	nop	\n"
     78 			"	nop	\n"
     79 			"	nop	\n"
     80 			"	nop	\n"
     81 			"	nop	\n"
     82 			"	nop	\n");
     83 }
     84