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/* $OpenBSD: db_trap.c,v 1.28 2017/01/09 17:58:44 mpi Exp $ */
/* $NetBSD: db_trap.c,v 1.9 1996/02/05 01:57:18 christos Exp $ */
/*
* Mach Operating System
* Copyright (c) 1993,1992,1991,1990 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 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 Mellon
* the rights to redistribute these changes.
*
* Author: David B. Golub, Carnegie Mellon University
* Date: 7/90
*/
/*
* Trap entry point to kernel debugger.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <machine/db_machdep.h>
#include <ddb/db_run.h>
#include <ddb/db_command.h>
#include <ddb/db_output.h>
#include <ddb/db_sym.h>
#include <ddb/db_extern.h>
#include <ddb/db_interface.h>
#include <ddb/db_var.h>
void
db_trap(int type, int code)
{
boolean_t bkpt;
boolean_t watchpt;
db_is_active = 1;
bkpt = IS_BREAKPOINT_TRAP(type, code);
watchpt = IS_WATCHPOINT_TRAP(type, code);
if (db_stop_at_pc(&ddb_regs, &bkpt)) {
if (db_inst_count) {
db_printf("After %d instructions\n", db_inst_count);
}
if (bkpt)
db_printf("Breakpoint at\t");
else if (watchpt)
db_printf("Watchpoint at\t");
else
db_printf("Stopped at\t");
db_dot = PC_REGS(&ddb_regs);
db_print_loc_and_inst(db_dot);
if (panicstr != NULL) {
static int ddb_msg_shown;
if (! ddb_msg_shown) {
/* show on-proc threads */
db_show_all_procs(0, 0, 0, "o");
}
/* then the backtrace */
db_stack_trace_print(db_dot, 0, 14 /* arbitrary */, "",
db_printf);
if (db_print_position() != 0)
db_printf("\n");
if (! ddb_msg_shown) {
db_printf(
"https://www.openbsd.org/ddb.html describes the minimum info required in bug\n"
"reports. Insufficient info makes it difficult to find and fix bugs.\n");
ddb_msg_shown = 1;
}
}
db_command_loop();
}
db_restart_at_pc(&ddb_regs, watchpt);
db_is_active = 0;
}
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