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/* $NetBSD: db_memrw.c,v 1.4 2001/05/18 20:38:27 matt Exp $ */
/* $OpenBSD: db_memrw.c,v 1.5 2003/10/15 01:06:13 drahn Exp $ */
/*
* Mach Operating System
* Copyright (c) 1992 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.
*/
/*
* Interface to the debugger for virtual memory read/write.
* This is a simple version for kernels with writable text.
* For an example of read-only kernel text, see the file:
* sys/arch/sun3/sun3/db_memrw.c
*
* ALERT! If you want to access device registers with a
* specific size, then the read/write functions have to
* make sure to do the correct sized pointer access.
*/
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <uvm/uvm_extern.h>
#include <machine/db_machdep.h>
#include <machine/pcb.h>
#include <ddb/db_access.h>
/*
* Read bytes from kernel address space for debugger.
*/
void
db_read_bytes(addr, size, data)
vaddr_t addr;
size_t size;
char *data;
{
char *src = (char *)addr;
faultbuf env;
faultbuf *old_onfault = curpcb->pcb_onfault;
if (setfault(&env)) {
curpcb->pcb_onfault = old_onfault;
return;
}
if (size == 4) {
*((int *)data) = *((int *)src);
} else if (size == 2) {
*((short *)data) = *((short *)src);
} else {
while (size > 0) {
--size;
*data++ = *src++;
}
}
curpcb->pcb_onfault = old_onfault;
}
/*
* Write bytes to kernel address space for debugger.
*/
void
db_write_bytes(addr, size, data)
vaddr_t addr;
size_t size;
char *data;
{
char *dst = (char *)addr;
faultbuf env;
faultbuf *old_onfault = curpcb->pcb_onfault;
if (setfault(&env)) {
curpcb->pcb_onfault = old_onfault;
return;
}
if (size == 4) {
*((int *)dst) = *((int *)data);
} else if (size == 2) {
*((short *)dst) = *((short *)data);
} else {
while (size > 0) {
--size;
*dst++ = *data++;
}
}
syncicache((void *)addr, size);
curpcb->pcb_onfault = old_onfault;
}
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