263 lines
5.7 KiB
C
263 lines
5.7 KiB
C
/* $OpenBSD: db_break.c,v 1.23 2023/03/08 04:43:07 guenther Exp $ */
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/* $NetBSD: db_break.c,v 1.7 1996/03/30 22:30:03 christos Exp $ */
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/*
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* Mach Operating System
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* Copyright (c) 1993,1992,1991,1990 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie Mellon
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* the rights to redistribute these changes.
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*
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* Author: David B. Golub, Carnegie Mellon University
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* Date: 7/90
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*/
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/*
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* Breakpoints.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <machine/db_machdep.h> /* type definitions */
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#include <ddb/db_access.h>
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#include <ddb/db_sym.h>
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#include <ddb/db_break.h>
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#include <ddb/db_output.h>
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#define NBREAKPOINTS 100
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struct db_breakpoint db_break_table[NBREAKPOINTS];
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db_breakpoint_t db_next_free_breakpoint = &db_break_table[0];
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db_breakpoint_t db_free_breakpoints = 0;
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db_breakpoint_t db_breakpoint_list = 0;
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db_breakpoint_t db_breakpoint_alloc(void);
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void db_breakpoint_free(db_breakpoint_t);
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void db_set_breakpoint(vaddr_t, int);
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void db_delete_breakpoint(vaddr_t);
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void db_list_breakpoints(void);
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db_breakpoint_t
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db_breakpoint_alloc(void)
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{
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db_breakpoint_t bkpt;
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if ((bkpt = db_free_breakpoints) != 0) {
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db_free_breakpoints = bkpt->link;
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return (bkpt);
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}
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if (db_next_free_breakpoint == &db_break_table[NBREAKPOINTS]) {
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db_printf("All breakpoints used.\n");
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return (0);
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}
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bkpt = db_next_free_breakpoint;
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db_next_free_breakpoint++;
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return (bkpt);
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}
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void
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db_breakpoint_free(db_breakpoint_t bkpt)
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{
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bkpt->link = db_free_breakpoints;
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db_free_breakpoints = bkpt;
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}
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void
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db_set_breakpoint(vaddr_t addr, int count)
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{
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db_breakpoint_t bkpt;
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if (db_find_breakpoint(addr)) {
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db_printf("Already set.\n");
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return;
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}
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#ifdef DB_VALID_BREAKPOINT
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if (!DB_VALID_BREAKPOINT(addr)) {
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db_printf("Not a valid address for a breakpoint.\n");
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return;
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}
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#endif
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bkpt = db_breakpoint_alloc();
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if (bkpt == 0) {
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db_printf("Too many breakpoints.\n");
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return;
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}
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bkpt->address = addr;
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bkpt->flags = 0;
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bkpt->init_count = count;
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bkpt->count = count;
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bkpt->link = db_breakpoint_list;
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db_breakpoint_list = bkpt;
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}
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void
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db_delete_breakpoint(vaddr_t addr)
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{
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db_breakpoint_t bkpt;
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db_breakpoint_t *prev;
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for (prev = &db_breakpoint_list; (bkpt = *prev) != 0;
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prev = &bkpt->link) {
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if (bkpt->address == addr) {
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*prev = bkpt->link;
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break;
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}
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}
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if (bkpt == 0) {
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db_printf("Not set.\n");
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return;
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}
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db_breakpoint_free(bkpt);
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}
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db_breakpoint_t
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db_find_breakpoint(vaddr_t addr)
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{
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db_breakpoint_t bkpt;
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for (bkpt = db_breakpoint_list; bkpt != 0; bkpt = bkpt->link)
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if (bkpt->address == addr)
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return (bkpt);
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return (0);
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}
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int db_breakpoints_inserted = 1;
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void
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db_set_breakpoints(void)
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{
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db_breakpoint_t bkpt;
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if (!db_breakpoints_inserted) {
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for (bkpt = db_breakpoint_list; bkpt != 0; bkpt = bkpt->link) {
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bkpt->bkpt_inst =
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db_get_value(bkpt->address, BKPT_SIZE, 0);
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db_put_value(bkpt->address, BKPT_SIZE,
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BKPT_SET(bkpt->bkpt_inst));
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}
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db_breakpoints_inserted = 1;
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}
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}
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void
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db_clear_breakpoints(void)
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{
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db_breakpoint_t bkpt;
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if (db_breakpoints_inserted) {
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for (bkpt = db_breakpoint_list; bkpt != 0; bkpt = bkpt->link)
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db_put_value(bkpt->address, BKPT_SIZE, bkpt->bkpt_inst);
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db_breakpoints_inserted = 0;
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}
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}
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/*
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* Set a temporary breakpoint.
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* The instruction is changed immediately,
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* so the breakpoint does not have to be on the breakpoint list.
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*/
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db_breakpoint_t
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db_set_temp_breakpoint(vaddr_t addr)
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{
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db_breakpoint_t bkpt;
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#ifdef DB_VALID_BREAKPOINT
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if (!DB_VALID_BREAKPOINT(addr)) {
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db_printf("Not a valid address for a breakpoint.\n");
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return (0);
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}
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#endif
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bkpt = db_breakpoint_alloc();
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if (bkpt == 0) {
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db_printf("Too many breakpoints.\n");
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return (0);
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}
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bkpt->address = addr;
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bkpt->flags = BKPT_TEMP;
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bkpt->init_count = 1;
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bkpt->count = 1;
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bkpt->bkpt_inst = db_get_value(bkpt->address, BKPT_SIZE, 0);
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db_put_value(bkpt->address, BKPT_SIZE, BKPT_SET(bkpt->bkpt_inst));
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return bkpt;
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}
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void
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db_delete_temp_breakpoint(db_breakpoint_t bkpt)
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{
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db_put_value(bkpt->address, BKPT_SIZE, bkpt->bkpt_inst);
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db_breakpoint_free(bkpt);
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}
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/*
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* List breakpoints.
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*/
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void
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db_list_breakpoints(void)
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{
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db_breakpoint_t bkpt;
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if (db_breakpoint_list == NULL) {
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db_printf("No breakpoints set\n");
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return;
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}
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db_printf(" Count Address\n");
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for (bkpt = db_breakpoint_list; bkpt != 0; bkpt = bkpt->link) {
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db_printf(" %5d ", bkpt->init_count);
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db_printsym(bkpt->address, DB_STGY_PROC, db_printf);
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db_printf("\n");
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}
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}
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/* Delete breakpoint */
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void
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db_delete_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
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{
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db_delete_breakpoint((vaddr_t)addr);
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}
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/* Set breakpoint with skip count */
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void
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db_breakpoint_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
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{
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if (count == -1)
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count = 1;
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db_set_breakpoint((vaddr_t)addr, count);
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}
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/* list breakpoints */
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void
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db_listbreak_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
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{
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db_list_breakpoints();
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}
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