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/*
* Copyright (c) 2013 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 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>
#define FRAME_OFFSET_R4 0
#define FRAME_OFFSET_R5 4
#define FRAME_OFFSET_R6 8
#define FRAME_OFFSET_R7 12
#define FRAME_OFFSET_R8 16
#define FRAME_OFFSET_R9 20
#define FRAME_OFFSET_R10 24
#define FRAME_OFFSET_R11 28
#define FRAME_OFFSET_LR 32
#define FRAME_SIZE (FRAME_OFFSET_LR + 4)
.section .text
FUNCTION_THUMB_ENTRY(_CPU_Context_validate)
/* Save */
sub sp, sp, #FRAME_SIZE
mov r1, r4
str r1, [sp, #FRAME_OFFSET_R4]
mov r1, r5
str r1, [sp, #FRAME_OFFSET_R5]
mov r1, r6
str r1, [sp, #FRAME_OFFSET_R6]
mov r1, r7
str r1, [sp, #FRAME_OFFSET_R7]
mov r1, r8
str r1, [sp, #FRAME_OFFSET_R8]
mov r1, r9
str r1, [sp, #FRAME_OFFSET_R9]
mov r1, r10
str r1, [sp, #FRAME_OFFSET_R10]
mov r1, r11
str r1, [sp, #FRAME_OFFSET_R11]
mov r1, lr
str r1, [sp, #FRAME_OFFSET_LR]
/* Fill */
/* R1 is used for temporary values */
mov r1, r0
/* R2 contains the stack pointer */
mov r2, sp
.macro fill_register reg
add r1, r1, #1
mov \reg, r1
.endm
fill_register r3
fill_register r4
fill_register r5
fill_register r6
fill_register r7
fill_register r8
fill_register r9
fill_register r10
fill_register r11
fill_register r12
fill_register lr
/* Check */
check:
.macro check_register reg
add r1, r1, #1
cmp \reg, r1
bne restore
.endm
cmp r2, sp
bne restore
mov r1, r0
check_register r3
check_register r4
check_register r5
check_register r6
check_register r7
check_register r8
check_register r9
check_register r10
check_register r11
check_register r12
check_register lr
b check
/* Restore */
restore:
ldr r1, [sp, #FRAME_OFFSET_R4]
mov r4, r1
ldr r1, [sp, #FRAME_OFFSET_R5]
mov r5, r1
ldr r1, [sp, #FRAME_OFFSET_R6]
mov r6, r1
ldr r1, [sp, #FRAME_OFFSET_R7]
mov r7, r1
ldr r1, [sp, #FRAME_OFFSET_R8]
mov r8, r1
ldr r1, [sp, #FRAME_OFFSET_R9]
mov r9, r1
ldr r1, [sp, #FRAME_OFFSET_R10]
mov r10, r1
ldr r1, [sp, #FRAME_OFFSET_R11]
mov r11, r1
ldr r1, [sp, #FRAME_OFFSET_LR]
mov lr, r1
add sp, sp, #FRAME_SIZE
bx lr
FUNCTION_END(_CPU_Context_validate)
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