413 lines
8.4 KiB
C
413 lines
8.4 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: David B. Golub, Carnegie Mellon University
|
|
* Date: 7/90
|
|
*/
|
|
/*
|
|
* Breakpoints.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_comconsole.h"
|
|
|
|
#include <sys/param.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_kern.h>
|
|
|
|
#include <ddb/ddb.h>
|
|
#include <ddb/db_break.h>
|
|
#include <ddb/db_access.h>
|
|
#include <ddb/db_sym.h>
|
|
|
|
#define NBREAKPOINTS 100
|
|
static struct db_breakpoint db_break_table[NBREAKPOINTS];
|
|
static db_breakpoint_t db_next_free_breakpoint = &db_break_table[0];
|
|
static db_breakpoint_t db_free_breakpoints = 0;
|
|
static db_breakpoint_t db_breakpoint_list = 0;
|
|
|
|
static db_breakpoint_t db_breakpoint_alloc(void);
|
|
static void db_breakpoint_free(db_breakpoint_t bkpt);
|
|
static void db_delete_breakpoint(vm_map_t map, db_addr_t addr);
|
|
static db_breakpoint_t db_find_breakpoint(vm_map_t map, db_addr_t addr);
|
|
static void db_list_breakpoints(void);
|
|
static void db_set_breakpoint(vm_map_t map, db_addr_t addr, int count);
|
|
|
|
static db_breakpoint_t
|
|
db_breakpoint_alloc()
|
|
{
|
|
register db_breakpoint_t bkpt;
|
|
|
|
if ((bkpt = db_free_breakpoints) != 0) {
|
|
db_free_breakpoints = bkpt->link;
|
|
return (bkpt);
|
|
}
|
|
if (db_next_free_breakpoint == &db_break_table[NBREAKPOINTS]) {
|
|
db_printf("All breakpoints used.\n");
|
|
return (0);
|
|
}
|
|
bkpt = db_next_free_breakpoint;
|
|
db_next_free_breakpoint++;
|
|
|
|
return (bkpt);
|
|
}
|
|
|
|
static void
|
|
db_breakpoint_free(bkpt)
|
|
register db_breakpoint_t bkpt;
|
|
{
|
|
bkpt->link = db_free_breakpoints;
|
|
db_free_breakpoints = bkpt;
|
|
}
|
|
|
|
static void
|
|
db_set_breakpoint(map, addr, count)
|
|
vm_map_t map;
|
|
db_addr_t addr;
|
|
int count;
|
|
{
|
|
register db_breakpoint_t bkpt;
|
|
|
|
if (db_find_breakpoint(map, addr)) {
|
|
db_printf("Already set.\n");
|
|
return;
|
|
}
|
|
|
|
bkpt = db_breakpoint_alloc();
|
|
if (bkpt == 0) {
|
|
db_printf("Too many breakpoints.\n");
|
|
return;
|
|
}
|
|
|
|
bkpt->map = map;
|
|
bkpt->address = addr;
|
|
bkpt->flags = 0;
|
|
bkpt->init_count = count;
|
|
bkpt->count = count;
|
|
|
|
bkpt->link = db_breakpoint_list;
|
|
db_breakpoint_list = bkpt;
|
|
}
|
|
|
|
static void
|
|
db_delete_breakpoint(map, addr)
|
|
vm_map_t map;
|
|
db_addr_t addr;
|
|
{
|
|
register db_breakpoint_t bkpt;
|
|
register db_breakpoint_t *prev;
|
|
|
|
for (prev = &db_breakpoint_list;
|
|
(bkpt = *prev) != 0;
|
|
prev = &bkpt->link) {
|
|
if (db_map_equal(bkpt->map, map) &&
|
|
(bkpt->address == addr)) {
|
|
*prev = bkpt->link;
|
|
break;
|
|
}
|
|
}
|
|
if (bkpt == 0) {
|
|
db_printf("Not set.\n");
|
|
return;
|
|
}
|
|
|
|
db_breakpoint_free(bkpt);
|
|
}
|
|
|
|
static db_breakpoint_t
|
|
db_find_breakpoint(map, addr)
|
|
vm_map_t map;
|
|
db_addr_t addr;
|
|
{
|
|
register db_breakpoint_t bkpt;
|
|
|
|
for (bkpt = db_breakpoint_list;
|
|
bkpt != 0;
|
|
bkpt = bkpt->link)
|
|
{
|
|
if (db_map_equal(bkpt->map, map) &&
|
|
(bkpt->address == addr))
|
|
return (bkpt);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
db_breakpoint_t
|
|
db_find_breakpoint_here(addr)
|
|
db_addr_t addr;
|
|
{
|
|
return db_find_breakpoint(db_map_addr(addr), addr);
|
|
}
|
|
|
|
static boolean_t db_breakpoints_inserted = TRUE;
|
|
|
|
#ifndef BKPT_WRITE
|
|
#define BKPT_WRITE(addr, storage) \
|
|
do { \
|
|
*storage = db_get_value(addr, BKPT_SIZE, FALSE); \
|
|
db_put_value(addr, BKPT_SIZE, BKPT_SET(*storage)); \
|
|
} while (0)
|
|
#endif
|
|
|
|
#ifndef BKPT_CLEAR
|
|
#define BKPT_CLEAR(addr, storage) \
|
|
db_put_value(addr, BKPT_SIZE, *storage)
|
|
#endif
|
|
|
|
void
|
|
db_set_breakpoints()
|
|
{
|
|
register db_breakpoint_t bkpt;
|
|
|
|
if (!db_breakpoints_inserted) {
|
|
|
|
for (bkpt = db_breakpoint_list;
|
|
bkpt != 0;
|
|
bkpt = bkpt->link)
|
|
if (db_map_current(bkpt->map)) {
|
|
BKPT_WRITE(bkpt->address, &bkpt->bkpt_inst);
|
|
}
|
|
db_breakpoints_inserted = TRUE;
|
|
}
|
|
}
|
|
|
|
void
|
|
db_clear_breakpoints()
|
|
{
|
|
register db_breakpoint_t bkpt;
|
|
|
|
if (db_breakpoints_inserted) {
|
|
|
|
for (bkpt = db_breakpoint_list;
|
|
bkpt != 0;
|
|
bkpt = bkpt->link)
|
|
if (db_map_current(bkpt->map)) {
|
|
BKPT_CLEAR(bkpt->address, &bkpt->bkpt_inst);
|
|
}
|
|
db_breakpoints_inserted = FALSE;
|
|
}
|
|
}
|
|
|
|
#ifdef SOFTWARE_SSTEP
|
|
/*
|
|
* Set a temporary breakpoint.
|
|
* The instruction is changed immediately,
|
|
* so the breakpoint does not have to be on the breakpoint list.
|
|
*/
|
|
db_breakpoint_t
|
|
db_set_temp_breakpoint(addr)
|
|
db_addr_t addr;
|
|
{
|
|
register db_breakpoint_t bkpt;
|
|
|
|
bkpt = db_breakpoint_alloc();
|
|
if (bkpt == 0) {
|
|
db_printf("Too many breakpoints.\n");
|
|
return 0;
|
|
}
|
|
|
|
bkpt->map = NULL;
|
|
bkpt->address = addr;
|
|
bkpt->flags = BKPT_TEMP;
|
|
bkpt->init_count = 1;
|
|
bkpt->count = 1;
|
|
|
|
BKPT_WRITE(bkpt->address, &bkpt->bkpt_inst);
|
|
return bkpt;
|
|
}
|
|
|
|
void
|
|
db_delete_temp_breakpoint(bkpt)
|
|
db_breakpoint_t bkpt;
|
|
{
|
|
BKPT_CLEAR(bkpt->address, &bkpt->bkpt_inst);
|
|
db_breakpoint_free(bkpt);
|
|
}
|
|
#endif /* SOFTWARE_SSTEP */
|
|
|
|
/*
|
|
* List breakpoints.
|
|
*/
|
|
static void
|
|
db_list_breakpoints()
|
|
{
|
|
register db_breakpoint_t bkpt;
|
|
|
|
if (db_breakpoint_list == 0) {
|
|
db_printf("No breakpoints set\n");
|
|
return;
|
|
}
|
|
|
|
db_printf(" Map Count Address\n");
|
|
for (bkpt = db_breakpoint_list;
|
|
bkpt != 0;
|
|
bkpt = bkpt->link) {
|
|
db_printf("%s%8p %5d ",
|
|
db_map_current(bkpt->map) ? "*" : " ",
|
|
(void *)bkpt->map, bkpt->init_count);
|
|
db_printsym(bkpt->address, DB_STGY_PROC);
|
|
db_printf("\n");
|
|
}
|
|
}
|
|
|
|
/* Delete breakpoint */
|
|
/*ARGSUSED*/
|
|
void
|
|
db_delete_cmd(addr, have_addr, count, modif)
|
|
db_expr_t addr;
|
|
boolean_t have_addr;
|
|
db_expr_t count;
|
|
char * modif;
|
|
{
|
|
db_delete_breakpoint(db_map_addr(addr), (db_addr_t)addr);
|
|
}
|
|
|
|
/* Set breakpoint with skip count */
|
|
/*ARGSUSED*/
|
|
void
|
|
db_breakpoint_cmd(addr, have_addr, count, modif)
|
|
db_expr_t addr;
|
|
boolean_t have_addr;
|
|
db_expr_t count;
|
|
char * modif;
|
|
{
|
|
if (count == -1)
|
|
count = 1;
|
|
|
|
db_set_breakpoint(db_map_addr(addr), (db_addr_t)addr, count);
|
|
}
|
|
|
|
/* list breakpoints */
|
|
void
|
|
db_listbreak_cmd(dummy1, dummy2, dummy3, dummy4)
|
|
db_expr_t dummy1;
|
|
boolean_t dummy2;
|
|
db_expr_t dummy3;
|
|
char * dummy4;
|
|
{
|
|
db_list_breakpoints();
|
|
}
|
|
|
|
/*
|
|
* We want ddb to be usable before most of the kernel has been
|
|
* initialized. In particular, current_thread() or kernel_map
|
|
* (or both) may be null.
|
|
*/
|
|
|
|
boolean_t
|
|
db_map_equal(map1, map2)
|
|
vm_map_t map1, map2;
|
|
{
|
|
return ((map1 == map2) ||
|
|
((map1 == NULL) && (map2 == kernel_map)) ||
|
|
((map1 == kernel_map) && (map2 == NULL)));
|
|
}
|
|
|
|
boolean_t
|
|
db_map_current(map)
|
|
vm_map_t map;
|
|
{
|
|
#if 0
|
|
thread_t thread;
|
|
|
|
return ((map == NULL) ||
|
|
(map == kernel_map) ||
|
|
(((thread = current_thread()) != NULL) &&
|
|
(map == thread->task->map)));
|
|
#else
|
|
return (1);
|
|
#endif
|
|
}
|
|
|
|
vm_map_t
|
|
db_map_addr(addr)
|
|
vm_offset_t addr;
|
|
{
|
|
#if 0
|
|
thread_t thread;
|
|
|
|
/*
|
|
* We want to return kernel_map for all
|
|
* non-user addresses, even when debugging
|
|
* kernel tasks with their own maps.
|
|
*/
|
|
|
|
if ((VM_MIN_ADDRESS <= addr) &&
|
|
(addr < VM_MAX_ADDRESS) &&
|
|
((thread = current_thread()) != NULL))
|
|
return thread->task->map;
|
|
else
|
|
#endif
|
|
return kernel_map;
|
|
}
|
|
|
|
#ifdef ALT_BREAK_TO_DEBUGGER
|
|
/*
|
|
* Solaris implements a new BREAK which is initiated by a character sequence
|
|
* CR ~ ^b which is similar to a familiar pattern used on Sun servers by the
|
|
* Remote Console.
|
|
*
|
|
* Note that this function may be called from almost anywhere, with interrupts
|
|
* disabled and with unknown locks held, so it must not access data other than
|
|
* its arguments. Its up to the caller to ensure that the state variable is
|
|
* consistent.
|
|
*/
|
|
|
|
#define KEY_CR 13 /* CR '\r' */
|
|
#define KEY_TILDE 126 /* ~ */
|
|
#define KEY_CRTLB 2 /* ^B */
|
|
|
|
int
|
|
db_alt_break(int data, int *state)
|
|
{
|
|
int brk = 0;
|
|
|
|
switch (data) {
|
|
case KEY_CR:
|
|
*state = KEY_TILDE;
|
|
break;
|
|
case KEY_TILDE:
|
|
if (*state == KEY_TILDE)
|
|
*state = KEY_CRTLB;
|
|
else
|
|
*state = 0;
|
|
break;
|
|
case KEY_CRTLB:
|
|
if (*state == KEY_CRTLB)
|
|
brk = 1;
|
|
/* FALLTHROUGH */
|
|
default:
|
|
*state = 0;
|
|
break;
|
|
}
|
|
return (brk);
|
|
}
|
|
#endif
|