1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
|
/**
* @file
*
* @ingroup arm
*
* @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.com/license/LICENSE.
*/
#include <rtems/asm.h>
#include <rtems/score/cpu.h>
.extern rtems_fatal_error_occurred
.globl arm_exc_data_abort_set_handler
.globl arm_exc_data_abort
.globl arm_exc_prefetch_abort_set_handler
.globl arm_exc_prefetch_abort
.section ".bss"
data_abort_handler:
.long 0
prefetch_abort_handler:
.long 0
.section ".text"
#ifdef __thumb__
.thumb_func
#endif
arm_exc_data_abort_set_handler:
ldr r1, =data_abort_handler
str r0, [r1]
bx lr
#ifdef __thumb__
.thumb_func
#endif
arm_exc_prefetch_abort_set_handler:
ldr r1, =prefetch_abort_handler
str r0, [r1]
bx lr
.arm
arm_exc_prefetch_abort:
/* Save context and load handler */
sub sp, #16
stmdb sp!, {r0-r12}
ldr r6, =prefetch_abort_handler
b save_more_context
arm_exc_data_abort:
/* Save context and load handler */
sub sp, #16
stmdb sp!, {r0-r12}
ldr r6, =data_abort_handler
save_more_context:
/* Save more context */
mov r2, lr
mrs r3, spsr
mrs r4, cpsr
orr r5, r3, #ARM_PSR_I
bic r5, #ARM_PSR_T
msr cpsr, r5
mov r0, sp
mov r1, lr
msr cpsr, r4
add r5, sp, #68
stmdb r5!, {r0-r3}
/* Call high level handler */
ldr r2, [r6]
cmp r2, #0
ldreq r2, =rtems_fatal_error_occurred
movne r0, sp
moveq r0, #0xaa
#ifndef __thumb__
mov lr, pc
bx r2
#else /* __thumb__ */
SWITCH_FROM_ARM_TO_THUMB r1
bl call_handler
SWITCH_FROM_THUMB_TO_ARM
#endif /* __thumb__ */
/* Restore context */
ldmia r5!, {r0-r3}
mov lr, r2
msr spsr, r3
ldmia sp!, {r0-r12}
add sp, #16
/* Return from interrupt */
subs pc, lr, #8
#ifdef __thumb__
.thumb
call_handler:
bx r2
#endif /* __thumb__ */
|
