/* $OpenBSD: db_memrw.c,v 1.1.1.1 2006/10/06 21:02:55 miod Exp $ */
/* $NetBSD: db_memrw.c,v 1.8 2006/02/24 00:57:19 uwe Exp $ */
/*
* Mach Operating System
* Copyright (c) 1991,1990 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* db_interface.c,v 2.4 1991/02/05 17:11:13 mrt (CMU)
*/
/*
* Routines to read and write memory on behalf of the debugger, used
* by DDB.
*/
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/stdint.h>
#include <uvm/uvm_extern.h>
#include <machine/db_machdep.h>
#include <ddb/db_access.h>
/*
* Read bytes from kernel address space for debugger.
*/
void
db_read_bytes(vaddr_t addr, size_t size, char *data)
{
char *src = (char *)addr;
/* properly aligned 4-byte */
if (size == 4 && ((addr & 3) == 0) && (((uintptr_t)data & 3) == 0)) {
*(uint32_t *)data = *(uint32_t *)src;
return;
}
/* properly aligned 2-byte */
if (size == 2 && ((addr & 1) == 0) && (((uintptr_t)data & 1) == 0)) {
*(uint16_t *)data = *(uint16_t *)src;
return;
}
while (size-- > 0)
*data++ = *src++;
}
/*
* Write bytes to kernel address space for debugger.
*/
void
db_write_bytes(vaddr_t addr, size_t size, char *data)
{
char *dst = (char *)addr;
/* properly aligned 4-byte */
if (size == 4 && ((addr & 3) == 0) && (((uintptr_t)data & 3) == 0)) {
*(uint32_t *)dst = *(const uint32_t *)data;
return;
}
/* properly aligned 2-byte */
if (size == 2 && ((addr & 1) == 0) && (((uintptr_t)data & 1) == 0)) {
*(uint16_t *)dst = *(const uint16_t *)data;
return;
}
while (size-- > 0)
*dst++ = *data++;
}