/* $NetBSD: db_trap.c,v 1.26 2019/03/12 07:44:58 skrll Exp $ */
/*
* 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 "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
[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.
*
* Author: David B. Golub, Carnegie Mellon University
* Date: 7/90
*/
/*
* Trap entry point to kernel debugger.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: db_trap.c,v 1.26 2019/03/12 07:44:58 skrll Exp $");
#include <sys/param.h>
#include <sys/proc.h>
#include <machine/db_machdep.h>
#include <ddb/db_run.h>
#include <ddb/db_command.h>
#include <ddb/db_break.h>
#include <ddb/db_output.h>
#include <ddb/db_sym.h>
#include <ddb/db_extern.h>
/*
* db_trap_callback can be hooked by MD port code to handle special
* cases such as disabling hardware watchdogs while in DDB.
*/
void (*db_trap_callback)(int);
int db_trap_type;
void
db_trap(int type, int code)
{
bool bkpt;
bool watchpt;
db_trap_type = type;
bkpt = IS_BREAKPOINT_TRAP(type, code);
watchpt = IS_WATCHPOINT_TRAP(type, code);
if (db_trap_callback)
db_trap_callback(1);
if (db_stop_at_pc(DDB_REGS, &bkpt)) {
if (db_inst_count) {
db_printf("After %d instructions "
"(%d loads, %d stores),\n",
db_inst_count, db_load_count, db_store_count);
}
if (bkpt)
db_printf("Breakpoint");
else if (watchpt)
db_printf("Watchpoint");
else
db_printf("Stopped");
db_printf(" in pid %d.%d (%s) at\t",
curproc->p_pid, curlwp->l_lid,
curproc->p_comm);
db_dot = PC_REGS(DDB_REGS);
db_print_loc_and_inst(db_dot);
db_command_loop();
}
db_restart_at_pc(DDB_REGS, watchpt);
if (db_trap_callback)
db_trap_callback(0);
}
