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/* $OpenBSD: db_watch.c,v 1.18 2020/10/15 03:14:00 deraadt Exp $ */
/* $NetBSD: db_watch.c,v 1.9 1996/03/30 22:30:12 christos Exp $ */
/*
* Mach Operating System
* Copyright (c) 1993,1992,1991,1990 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.
*
* Author: Richard P. Draves, Carnegie Mellon University
* Date: 10/90
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <machine/db_machdep.h>
#include <ddb/db_break.h>
#include <ddb/db_watch.h>
#include <ddb/db_lex.h>
#include <ddb/db_run.h>
#include <ddb/db_sym.h>
#include <ddb/db_output.h>
#include <ddb/db_command.h>
#include <ddb/db_extern.h>
/*
* Watchpoints.
*/
int db_watchpoints_inserted = 1;
#define NWATCHPOINTS 100
struct db_watchpoint db_watch_table[NWATCHPOINTS];
db_watchpoint_t db_next_free_watchpoint = &db_watch_table[0];
db_watchpoint_t db_free_watchpoints = 0;
db_watchpoint_t db_watchpoint_list = 0;
db_watchpoint_t
db_watchpoint_alloc(void)
{
db_watchpoint_t watch;
if ((watch = db_free_watchpoints) != 0) {
db_free_watchpoints = watch->link;
return (watch);
}
if (db_next_free_watchpoint == &db_watch_table[NWATCHPOINTS]) {
db_printf("All watchpoints used.\n");
return (0);
}
watch = db_next_free_watchpoint;
db_next_free_watchpoint++;
return (watch);
}
void
db_watchpoint_free(db_watchpoint_t watch)
{
watch->link = db_free_watchpoints;
db_free_watchpoints = watch;
}
void
db_set_watchpoint(vaddr_t addr, vsize_t size)
{
db_watchpoint_t watch;
/*
* Should we do anything fancy with overlapping regions?
*/
for (watch = db_watchpoint_list; watch != 0; watch = watch->link)
if (watch->loaddr == addr && watch->hiaddr == addr + size) {
db_printf("Already set.\n");
return;
}
watch = db_watchpoint_alloc();
if (watch == 0) {
db_printf("Too many watchpoints.\n");
return;
}
watch->loaddr = addr;
watch->hiaddr = addr+size;
watch->link = db_watchpoint_list;
db_watchpoint_list = watch;
db_watchpoints_inserted = 0;
}
void
db_delete_watchpoint(vaddr_t addr)
{
db_watchpoint_t watch;
db_watchpoint_t *prev;
for (prev = &db_watchpoint_list; (watch = *prev) != 0;
prev = &watch->link)
if (watch->loaddr <= addr && addr < watch->hiaddr) {
*prev = watch->link;
db_watchpoint_free(watch);
return;
}
db_printf("Not set.\n");
}
void
db_list_watchpoints(void)
{
db_watchpoint_t watch;
if (db_watchpoint_list == 0) {
db_printf("No watchpoints set\n");
return;
}
db_printf(" Address Size\n");
for (watch = db_watchpoint_list; watch != 0; watch = watch->link)
db_printf("%8lx %lx\n",
watch->loaddr, watch->hiaddr - watch->loaddr);
}
/* Delete watchpoint */
/*ARGSUSED*/
void
db_deletewatch_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
{
db_delete_watchpoint(addr);
}
/* Set watchpoint */
/*ARGSUSED*/
void
db_watchpoint_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
{
vsize_t size;
db_expr_t value;
if (db_expression(&value))
size = (vsize_t) value;
else
size = 4;
db_skip_to_eol();
db_set_watchpoint(addr, size);
}
/* list watchpoints */
/*ARGSUSED*/
void
db_listwatch_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
{
db_list_watchpoints();
}
void
db_set_watchpoints(void)
{
db_watchpoint_t watch;
if (!db_watchpoints_inserted && db_watchpoint_list != NULL) {
for (watch = db_watchpoint_list; watch != 0;
watch = watch->link)
pmap_protect(pmap_kernel(), trunc_page(watch->loaddr),
round_page(watch->hiaddr), PROT_READ);
pmap_update(pmap_kernel());
db_watchpoints_inserted = 1;
}
}
void
db_clear_watchpoints(void)
{
db_watchpoints_inserted = 0;
}
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