311 lines
6.7 KiB
C
311 lines
6.7 KiB
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 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.
|
|
*/
|
|
/*
|
|
* Author: Richard P. Draves, Carnegie Mellon University
|
|
* Date: 10/90
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/proc.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/pmap.h>
|
|
#include <vm/vm_map.h>
|
|
|
|
#include <ddb/ddb.h>
|
|
#include <ddb/db_watch.h>
|
|
|
|
/*
|
|
* Watchpoints.
|
|
*/
|
|
|
|
static bool db_watchpoints_inserted = true;
|
|
|
|
#define NWATCHPOINTS 100
|
|
static struct db_watchpoint db_watch_table[NWATCHPOINTS];
|
|
static db_watchpoint_t db_next_free_watchpoint = &db_watch_table[0];
|
|
static db_watchpoint_t db_free_watchpoints = 0;
|
|
static db_watchpoint_t db_watchpoint_list = 0;
|
|
|
|
static db_watchpoint_t db_watchpoint_alloc(void);
|
|
static void db_watchpoint_free(db_watchpoint_t watch);
|
|
static void db_delete_watchpoint(vm_map_t map, db_addr_t addr);
|
|
#ifdef notused
|
|
static bool db_find_watchpoint(vm_map_t map, db_addr_t addr,
|
|
db_regs_t *regs);
|
|
#endif
|
|
static void db_list_watchpoints(void);
|
|
static void db_set_watchpoint(vm_map_t map, db_addr_t addr,
|
|
vm_size_t size);
|
|
|
|
static 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);
|
|
}
|
|
|
|
static void
|
|
db_watchpoint_free(db_watchpoint_t watch)
|
|
{
|
|
watch->link = db_free_watchpoints;
|
|
db_free_watchpoints = watch;
|
|
}
|
|
|
|
static void
|
|
db_set_watchpoint(vm_map_t map, db_addr_t addr, vm_size_t size)
|
|
{
|
|
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;
|
|
}
|
|
|
|
static void
|
|
db_delete_watchpoint(vm_map_t map, db_addr_t addr)
|
|
{
|
|
db_watchpoint_t watch;
|
|
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");
|
|
}
|
|
|
|
static void
|
|
db_list_watchpoints(void)
|
|
{
|
|
db_watchpoint_t watch;
|
|
|
|
if (db_watchpoint_list == 0) {
|
|
db_printf("No watchpoints set\n");
|
|
return;
|
|
}
|
|
|
|
#ifdef __LP64__
|
|
db_printf(" Map Address Size\n");
|
|
#else
|
|
db_printf(" Map Address Size\n");
|
|
#endif
|
|
for (watch = db_watchpoint_list;
|
|
watch != 0;
|
|
watch = watch->link)
|
|
#ifdef __LP64__
|
|
db_printf("%s%16p %16lx %lx\n",
|
|
#else
|
|
db_printf("%s%8p %8lx %lx\n",
|
|
#endif
|
|
db_map_current(watch->map) ? "*" : " ",
|
|
(void *)watch->map, (long)watch->loaddr,
|
|
(long)watch->hiaddr - (long)watch->loaddr);
|
|
}
|
|
|
|
/* Delete watchpoint */
|
|
/*ARGSUSED*/
|
|
void
|
|
db_deletewatch_cmd(db_expr_t addr, bool have_addr, db_expr_t count,
|
|
char *modif)
|
|
{
|
|
db_delete_watchpoint(db_map_addr(addr), addr);
|
|
}
|
|
|
|
/* Set watchpoint */
|
|
/*ARGSUSED*/
|
|
void
|
|
db_watchpoint_cmd(db_expr_t addr, bool 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);
|
|
}
|
|
|
|
/*
|
|
* At least one non-optional show-command must be implemented using
|
|
* DB_SHOW_COMMAND() so that db_show_cmd_set gets created. Here is one.
|
|
*/
|
|
DB_SHOW_COMMAND(watches, db_listwatch_cmd)
|
|
{
|
|
db_list_watchpoints();
|
|
db_md_list_watchpoints();
|
|
}
|
|
|
|
void
|
|
db_set_watchpoints(void)
|
|
{
|
|
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(void)
|
|
{
|
|
db_watchpoints_inserted = false;
|
|
}
|
|
|
|
#ifdef notused
|
|
static bool
|
|
db_find_watchpoint(vm_map_t map, db_addr_t addr, db_regs_t regs)
|
|
{
|
|
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);
|
|
}
|
|
#endif
|
|
|
|
|
|
|
|
/* Delete hardware watchpoint */
|
|
/*ARGSUSED*/
|
|
void
|
|
db_deletehwatch_cmd(db_expr_t addr, bool have_addr, db_expr_t count,
|
|
char *modif)
|
|
{
|
|
int rc;
|
|
|
|
if (count < 0)
|
|
count = 4;
|
|
|
|
rc = db_md_clr_watchpoint(addr, count);
|
|
if (rc < 0)
|
|
db_printf("hardware watchpoint could not be deleted\n");
|
|
}
|
|
|
|
/* Set hardware watchpoint */
|
|
/*ARGSUSED*/
|
|
void
|
|
db_hwatchpoint_cmd(db_expr_t addr, bool have_addr, db_expr_t count,
|
|
char *modif)
|
|
{
|
|
int rc;
|
|
|
|
if (count < 0)
|
|
count = 4;
|
|
|
|
rc = db_md_set_watchpoint(addr, count);
|
|
if (rc < 0)
|
|
db_printf("hardware watchpoint could not be set\n");
|
|
}
|