/*
 * Copyright (c) 2013 embedded brains GmbH.  All rights reserved.
 *
 *  embedded brains GmbH
 *  Obere Lagerstr. 30
 *  82178 Puchheim
 *  Germany
 *  <rtems@embedded-brains.de>
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.rtems.com/license/LICENSE.
 */

#ifdef HAVE_CONFIG_H
  #include "config.h"
#endif

#include <rtems/asm.h>
#include <rtems/system.h>

#ifdef ARM_MULTILIB_ARCH_V4

.extern _ARM_Exception_default

.globl _ARMV4_Exception_undef_default
.globl _ARMV4_Exception_swi_default
.globl _ARMV4_Exception_data_abort_default
.globl _ARMV4_Exception_pref_abort_default
.globl _ARMV4_Exception_reserved_default
.globl _ARMV4_Exception_irq_default
.globl _ARMV4_Exception_fiq_default

.section ".text"

.arm

_ARMV4_Exception_undef_default:

	/* Save context and load vector */
	sub	sp, #20
	stmdb	sp!, {r0-r12}
	mov	r4, #1

	b	save_more_context

_ARMV4_Exception_swi_default:

	/* Save context and load vector */
	sub	sp, #20
	stmdb	sp!, {r0-r12}
	mov	r4, #2

	b	save_more_context

_ARMV4_Exception_pref_abort_default:

	/* Save context and load vector */
	sub	sp, #20
	stmdb	sp!, {r0-r12}
	mov	r4, #3

	b	save_more_context

_ARMV4_Exception_data_abort_default:

	/* Save context and load vector */
	sub	sp, #20
	stmdb	sp!, {r0-r12}
	mov	r4, #4

_ARMV4_Exception_reserved_default:

	/* Save context and load vector */
	sub	sp, #20
	stmdb	sp!, {r0-r12}
	mov	r4, #5

_ARMV4_Exception_irq_default:

	/* Save context and load vector */
	sub	sp, #20
	stmdb	sp!, {r0-r12}
	mov	r4, #6

_ARMV4_Exception_fiq_default:

	/* Save context and load vector */
	sub	sp, #20
	stmdb	sp!, {r0-r12}
	mov	r4, #7

save_more_context:

	/* Save more context */
	mov	r2, lr
	mrs	r3, spsr
	mrs	r7, cpsr
	orr	r5, r3, #ARM_PSR_I
	bic	r5, #ARM_PSR_T
	msr	cpsr, r5
	mov	r0, sp
	mov	r1, lr
	msr	cpsr, r7
	add	r5, sp, #72
	stmdb	r5!, {r0-r4}

	/* Call high level handler */
	mov	r0, sp
	SWITCH_FROM_ARM_TO_THUMB	r1
	bl	_ARM_Exception_default

	/* Just in case */
twiddle:
	b	twiddle

#endif /* ARM_MULTILIB_ARCH_V4 */