-
Notifications
You must be signed in to change notification settings - Fork 6
Expand file tree
/
Copy pathInit.s
More file actions
82 lines (59 loc) · 2.38 KB
/
Init.s
File metadata and controls
82 lines (59 loc) · 2.38 KB
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
;*********************************************************************************************
; NAME: entry.s
; Author: lihua
; History: 2014-4-10
;********************************************************************************************
IMPORT main
area Init,code,readonly
entry
code32
; ********************** Setup interrupt/exception vectors ********************************
start b Reset_Handler
Undefined_Handler b Undefined_Handler
SWI_Handler b SWI_Handler
Prefetch_handler b Prefetch_handler
Abort_Handler b Abort_Handler
nop ;Reservedvecto
IRQ_Handler b IRQ_Handler
FIQ_Handler b FIQ_Handler
Reset_Handler
bl initstack ;初始化各模式下的堆栈指针
;切换至用户模式堆
msr cpsr_c,#0xd0 ;110 10000
bl main
halt b halt
initstack mov r0,lr ;r0<--lr,因为各种模式下r0是相同的而各个模式�
;设置管理模式堆栈
msr cpsr_c,#0xd3 ;110 10011
ldr sp,stacksvc
;设置中断模式堆栈
msr cpsr_c,#0xd2 ;110 10010
ldr sp,stackirq
;设置快速中断模式堆栈
msr cpsr_c,#0xd1 ;110 10001
ldr sp,stackfiq
;设置中止模式堆栈
msr cpsr_c,#0xd7 ;110 10111
ldr sp,stackabt
;设置未定义模式堆栈
msr cpsr_c,#0xdb ;110 11011
ldr sp,stackund
;设置系统模式堆栈
msr cpsr_c,#0xdf ;110 11111
ldr sp,stackusr
mov pc,r0 ;返回
LTORG
stackusr dcd usrstackspace+128
stacksvc dcd svcstackspace+128
stackirq dcd irqstackspace+128
stackfiq dcd fiqstackspace+128
stackabt dcd abtstackspace+128
stackund dcd undstackspace+128
area Interrupt,data,READWRITE
usrstackspace space 128
svcstackspace space 128
irqstackspace space 128
fiqstackspace space 128
abtstackspace space 128
undstackspace space 128
end