/* $OpenBSD: db_memrw.c,v 1.12 2007/02/20 21:15:01 tom Exp $ */
/* $NetBSD: db_memrw.c,v 1.6 1999/04/12 20:38:19 pk 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 "AS IS"
* 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 Mellon
* 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 and KGDB.
*/
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.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;
src = (char *)addr;
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;
pt_entry_t *ptep0 = 0;
pt_entry_t oldmap0 = { 0 };
vaddr_t addr1;
pt_entry_t *ptep1 = 0;
pt_entry_t oldmap1 = { 0 };
extern char etext;
if (addr >= VM_MIN_KERNEL_ADDRESS &&
addr < (vaddr_t)&etext) {
ptep0 = kvtopte(addr);
oldmap0 = *ptep0;
*(int *)ptep0 |= /* INTEL_PTE_WRITE */ PG_RW;
addr1 = trunc_page(addr + size - 1);
if (trunc_page(addr) != addr1) {
/* data crosses a page boundary */
ptep1 = kvtopte(addr1);
oldmap1 = *ptep1;
*(int *)ptep1 |= /* INTEL_PTE_WRITE */ PG_RW;
}
tlbflush();
}
dst = (char *)addr;
while (size-- > 0)
*dst++ = *data++;
if (ptep0) {
*ptep0 = oldmap0;
if (ptep1)
*ptep1 = oldmap1;
tlbflush();
}
}