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Import of OpenBSD 4.2 release kernel tree with initial code to support 
Jornada 720/728, StrongARM 1110-based handheld PC.
At this point kernel roots on NFS and boots into vfs_mountroot() and traps.
What is supported:
- glass console, Jornada framebuffer (jfb) works in 16bpp direct color mode
(needs some palette tweaks for non black/white/blue colors, i think)
- saic, SA11x0 interrupt controller (needs cleanup)
- sacom, SA11x0 UART (supported only as boot console for now)
- SA11x0 GPIO controller fully supported (but can't handle multiple interrupt
handlers on one gpio pin)
- sassp, SSP port on SA11x0 that attaches spibus
- Jornada microcontroller (jmcu) to control kbd, battery, etc throught
the SPI bus (wskbd attaches on jmcu, but not tested)
- tod functions seem work
- initial code for SA-1111 (chip companion) : this is TODO

Next important steps, i think:
- gpio and intc on sa1111
- pcmcia support for sa11x0 (and sa1111 help logic)
- REAL root on nfs when we have PCMCIA support (we may use any of supported pccard NICs)
- root on wd0! (using already supported PCMCIA-ATA)

/*	$OpenBSD: db_trap.c,v 1.13 2007/06/04 17:03:04 miod 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/proc.h>
#include <sys/systm.h>

#include <uvm/uvm_extern.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>
#include <ddb/db_interface.h>

void
db_trap(int type, int code)
{
	boolean_t	bkpt;
	boolean_t	watchpt;

	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 ", db_inst_count);
			db_printf("(%d loads, %d stores),\n", db_load_count,
			    db_store_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);

		/*
		 * Just in case we do not have any usable console driver,
		 * give the user a traceback.
		 */
		if (cold) {
			db_stack_trace_print(db_dot, 0, 10 /* arbitrary */, "",
			    db_printf);
		}

		if (panicstr != NULL) {
			if (db_print_position() != 0)
				db_printf("\n");
			db_printf("RUN AT LEAST 'trace' AND 'ps' AND INCLUDE "
			    "OUTPUT WHEN REPORTING THIS PANIC!\n");
			db_printf("DO NOT EVEN BOTHER REPORTING THIS WITHOUT "
			    "INCLUDING THAT INFORMATION!\n");
		}

		db_command_loop();
	}

	db_restart_at_pc(DDB_REGS, watchpt);
}