Source to ddb/db_watch.c
/*
* 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 [email protected]
* 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.
*/
/*
* HISTORY
* $Log: db_watch.c,v $
* Revision 1.1 1992/03/25 21:45:37 pace
* Initial revision
*
* Revision 2.5 91/02/05 17:07:27 mrt
* Changed to new Mach copyright
* [91/01/31 16:20:02 mrt]
*
* Revision 2.4 91/01/08 15:09:24 rpd
* Use db_map_equal, db_map_current, db_map_addr.
* [90/11/10 rpd]
*
* Revision 2.3 90/11/05 14:26:39 rpd
* Initialize db_watchpoints_inserted to TRUE.
* [90/11/04 rpd]
*
* Revision 2.2 90/10/25 14:44:16 rwd
* Made db_watchpoint_cmd parse a size argument.
* [90/10/17 rpd]
* Generalized the watchpoint support.
* [90/10/16 rwd]
* Created.
* [90/10/16 rpd]
*
*/
/*
* Author: Richard P. Draves, Carnegie Mellon University
* Date: 10/90
*/
#include "param.h"
#include "proc.h"
#include <machine/db_machdep.h>
#include <vm/vm_map.h>
#include <ddb/db_lex.h>
#include <ddb/db_watch.h>
#include <ddb/db_access.h>
#include <ddb/db_sym.h>
#include <machine/db_machdep.h>
/*
* Watchpoints.
*/
extern boolean_t db_map_equal();
extern boolean_t db_map_current();
extern vm_map_t db_map_addr();
boolean_t db_watchpoints_inserted = TRUE;
#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()
{
register 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(watch)
register db_watchpoint_t watch;
{
watch->link = db_free_watchpoints;
db_free_watchpoints = watch;
}
void
db_set_watchpoint(map, addr, size)
vm_map_t map;
db_addr_t addr;
vm_size_t size;
{
register db_watchpoint_t watch;
if (map == NULL) {
db_printf("No map.\n");
return;
}
/*
* Should we do anything fancy with overlapping regions?
*/
for (watch = db_watchpoint_list;
watch != 0;
watch = watch->link)
if (db_map_equal(watch->map, map) &&
(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->map = map;
watch->loaddr = addr;
watch->hiaddr = addr+size;
watch->link = db_watchpoint_list;
db_watchpoint_list = watch;
db_watchpoints_inserted = FALSE;
}
void
db_delete_watchpoint(map, addr)
vm_map_t map;
db_addr_t addr;
{
register db_watchpoint_t watch;
register db_watchpoint_t *prev;
for (prev = &db_watchpoint_list;
(watch = *prev) != 0;
prev = &watch->link)
if (db_map_equal(watch->map, map) &&
(watch->loaddr <= addr) &&
(addr < watch->hiaddr)) {
*prev = watch->link;
db_watchpoint_free(watch);
return;
}
db_printf("Not set.\n");
}
void
db_list_watchpoints()
{
register db_watchpoint_t watch;
if (db_watchpoint_list == 0) {
db_printf("No watchpoints set\n");
return;
}
db_printf(" Map Address Size\n");
for (watch = db_watchpoint_list;
watch != 0;
watch = watch->link)
db_printf("%s%8x %8x %x\n",
db_map_current(watch->map) ? "*" : " ",
watch->map, watch->loaddr,
watch->hiaddr - watch->loaddr);
}
/* Delete watchpoint */
/*ARGSUSED*/
void
db_deletewatch_cmd(addr, have_addr, count, modif)
db_expr_t addr;
int have_addr;
db_expr_t count;
char * modif;
{
db_delete_watchpoint(db_map_addr(addr), addr);
}
/* Set watchpoint */
/*ARGSUSED*/
void
db_watchpoint_cmd(addr, have_addr, count, modif)
db_expr_t addr;
int have_addr;
db_expr_t count;
char * modif;
{
vm_size_t size;
db_expr_t value;
if (db_expression(&value))
size = (vm_size_t) value;
else
size = 4;
db_skip_to_eol();
db_set_watchpoint(db_map_addr(addr), addr, size);
}
/* list watchpoints */
void
db_listwatch_cmd()
{
db_list_watchpoints();
}
void
db_set_watchpoints()
{
register db_watchpoint_t watch;
if (!db_watchpoints_inserted) {
for (watch = db_watchpoint_list;
watch != 0;
watch = watch->link)
pmap_protect(watch->map->pmap,
trunc_page(watch->loaddr),
round_page(watch->hiaddr),
VM_PROT_READ);
db_watchpoints_inserted = TRUE;
}
}
void
db_clear_watchpoints()
{
db_watchpoints_inserted = FALSE;
}
boolean_t
db_find_watchpoint(map, addr, regs)
vm_map_t map;
db_addr_t addr;
db_regs_t *regs;
{
register db_watchpoint_t watch;
db_watchpoint_t found = 0;
for (watch = db_watchpoint_list;
watch != 0;
watch = watch->link)
if (db_map_equal(watch->map, map)) {
if ((watch->loaddr <= addr) &&
(addr < watch->hiaddr))
return (TRUE);
else if ((trunc_page(watch->loaddr) <= addr) &&
(addr < round_page(watch->hiaddr)))
found = watch;
}
/*
* We didn't hit exactly on a watchpoint, but we are
* in a protected region. We want to single-step
* and then re-protect.
*/
if (found) {
db_watchpoints_inserted = FALSE;
db_single_step(regs);
}
return (FALSE);
}