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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: process_machdep.c,v 1.3 2005/12/16 21:36:31 miod Exp $	*/
/*	$NetBSD: process_machdep.c,v 1.11 2003/08/07 16:26:52 agc Exp $	*/

/*
 * Copyright (c) 1993 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Jan-Simon Pendry.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * From:
 *	Id: procfs_i386.c,v 4.1 1993/12/17 10:47:45 jsp Rel
 */

/*
 * Copyright (c) 1995 Frank Lancaster.  All rights reserved.
 * Copyright (c) 1995 Tools GmbH.  All rights reserved.
 * Copyright (c) 1995 Charles M. Hannum.  All rights reserved.
 * Copyright (c) 1993 Jan-Simon Pendry
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Jan-Simon Pendry.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * From:
 *	Id: procfs_i386.c,v 4.1 1993/12/17 10:47:45 jsp Rel
 */

/*
 * This file may seem a bit stylized, but that so that it's easier to port.
 * Functions to be implemented here are:
 *
 * process_read_regs(proc, regs)
 *	Get the current user-visible register set from the process
 *	and copy it into the regs structure (<machine/reg.h>).
 *	The process is stopped at the time read_regs is called.
 *
 * process_write_regs(proc, regs)
 *	Update the current register set from the passed in regs
 *	structure.  Take care to avoid clobbering special CPU
 *	registers or privileged bits in the PSL.
 *	The process is stopped at the time write_regs is called.
 *
 * process_sstep(proc, sstep)
 *	Arrange for the process to trap or not trap depending on sstep
 *	after executing a single instruction.
 *
 * process_set_pc(proc)
 *	Set the process's program counter.
 */

#include <sys/param.h>

#include <sys/proc.h>
#include <sys/ptrace.h>
#include <sys/systm.h>
#include <sys/user.h>

#include <machine/frame.h>
#include <machine/pcb.h>
#include <machine/reg.h>

#include <arm/armreg.h>

#ifdef ARMFPE
#include <arm/fpe-arm/armfpe.h>
#endif

static __inline struct trapframe *
process_frame(struct proc *p)
{

	return p->p_addr->u_pcb.pcb_tf;
}

int
process_read_regs(struct proc *p, struct reg *regs)
{
	struct trapframe *tf = process_frame(p);

	KASSERT(tf != NULL);
	bcopy((caddr_t)&tf->tf_r0, (caddr_t)regs->r, sizeof(regs->r));
	regs->r_sp = tf->tf_usr_sp;
	regs->r_lr = tf->tf_usr_lr;
	regs->r_pc = tf->tf_pc;
	regs->r_cpsr = tf->tf_spsr;

#ifdef DIAGNOSTIC
	if ((tf->tf_spsr & PSR_MODE) == PSR_USR32_MODE
	    && tf->tf_spsr & I32_bit)
		panic("process_read_regs: Interrupts blocked in user process");
#endif

	return(0);
}

int
process_read_fpregs(struct proc *p, struct fpreg *regs)
{
#ifdef ARMFPE
	arm_fpe_getcontext(p, regs);
	return(0);
#else	/* ARMFPE */
	/* No hardware FP support */
	memset(regs, 0, sizeof(struct fpreg));
	return(0);
#endif	/* ARMFPE */
}

#ifdef	PTRACE

int
process_write_regs(struct proc *p, struct reg *regs)
{
	struct trapframe *tf = process_frame(p);

	KASSERT(tf != NULL);
	bcopy((caddr_t)regs->r, (caddr_t)&tf->tf_r0, sizeof(regs->r));
	tf->tf_usr_sp = regs->r_sp;
	tf->tf_usr_lr = regs->r_lr;
#ifdef __PROG32
	tf->tf_pc = regs->r_pc;
	tf->tf_spsr &=  ~PSR_FLAGS;
	tf->tf_spsr |= regs->r_cpsr & PSR_FLAGS;
#ifdef DIAGNOSTIC
	if ((tf->tf_spsr & PSR_MODE) == PSR_USR32_MODE
	    && tf->tf_spsr & I32_bit)
		panic("process_write_regs: Interrupts blocked in user process");
#endif
#else /* __PROG26 */
	if ((regs->r_pc & (R15_MODE | R15_IRQ_DISABLE | R15_FIQ_DISABLE)) != 0)
		return EPERM;

	tf->tf_r15 = regs->r_pc;
#endif

	return(0);
}

int
process_write_fpregs(struct proc *p,  struct fpreg *regs)
{
#ifdef ARMFPE
	arm_fpe_setcontext(p, regs);
	return(0);
#else	/* ARMFPE */
	/* No hardware FP support */
	return(0);
#endif	/* ARMFPE */
}

int
process_sstep(struct proc *p, int sstep)
{
	if (sstep)
		return (EINVAL);
	return 0;
}

int
process_set_pc(struct proc *p, caddr_t addr)
{
	struct trapframe *tf = process_frame(p);

	KASSERT(tf != NULL);
#ifdef __PROG32
	tf->tf_pc = (int)addr;
#else /* __PROG26 */
	/* Only set the PC, not the PSR */
	if (((register_t)addr & R15_PC) != (register_t)addr)
		return EINVAL;
	tf->tf_r15 = (tf->tf_r15 & ~R15_PC) | (register_t)addr;
#endif

	return (0);
}

#endif	/* PTRACE */