/**
* @file
*
* @ingroup RTEMSScoreCPUARM
*
* @brief ARM data and prefetch abort exception prologue and epilogue.
*/
/*
* Copyright (c) 2009
* embedded brains GmbH
* Obere Lagerstr. 30
* D-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.org/license/LICENSE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/asm.h>
#ifdef ARM_MULTILIB_ARCH_V4
.extern _ARM_Exception_default
.globl _ARMV4_Exception_data_abort_set_handler
.globl _ARMV4_Exception_data_abort
.globl _ARMV4_Exception_prefetch_abort_set_handler
.globl _ARMV4_Exception_prefetch_abort
.section ".bss"
data_abort_handler:
.long 0
prefetch_abort_handler:
.long 0
.section ".text"
#ifdef __thumb__
.thumb_func
#endif
_ARMV4_Exception_data_abort_set_handler:
ldr r1, =data_abort_handler
str r0, [r1]
#ifdef __thumb__
bx lr
#else
mov pc, lr
#endif
#ifdef __thumb__
.thumb_func
#endif
_ARMV4_Exception_prefetch_abort_set_handler:
ldr r1, =prefetch_abort_handler
str r0, [r1]
#ifdef __thumb__
bx lr
#else
mov pc, lr
#endif
.arm
_ARMV4_Exception_prefetch_abort:
/* Save context and load handler */
sub sp, #20
stmdb sp!, {r0-r12}
mov r4, #3
ldr r6, =prefetch_abort_handler
b save_more_context
_ARMV4_Exception_data_abort:
/* Save context and load handler */
sub sp, #20
stmdb sp!, {r0-r12}
mov r4, #4
ldr r6, =data_abort_handler
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 */
ldr r2, [r6]
cmp r2, #0
ldreq r2, =_ARM_Exception_default
mov r0, sp
#ifndef __thumb__
mov lr, pc
mov pc, r2
#else /* __thumb__ */
SWITCH_FROM_ARM_TO_THUMB r1
bl call_handler
SWITCH_FROM_THUMB_TO_ARM
#endif /* __thumb__ */
/* Restore context */
ldmia r5!, {r0-r4}
mov lr, r2
msr spsr, r3
ldmia sp!, {r0-r12}
add sp, #20
/* Return from interrupt */
subs pc, lr, #8
#ifdef __thumb__
.thumb
call_handler:
bx r2
#endif /* __thumb__ */
#endif /* ARM_MULTILIB_ARCH_V4 */
