ARM VERSION 1.2 manuali

Arm VERSION 1.2 Guida Utente (133 pagine)

Marchio: Arm | Categoria: Sparaneve | Dimensione: 0.36 MB |

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Indice

ARM® Developer Suite

1

Version 1.2

1

Developer Guide

1

About this book

2

ARM publications

3

Other publications

3

Feedback

4

1 Introduction

5

Introduction

6

1.3 Developing for the ARM

7

1.3.5 Writing Code for ROM

8

2.1.1 ATPCS variants

9

2.1.2 ARM C libraries

9

• Read-only memory

10

2.2 Register roles and names

11

2.3 The stack

12

2.4 Parameter passing

14

2.5 Stack limit checking

15

2.6.2 Writing code for ROPI

17

2.7.1 Reentrant routines

18

2.9 Floating-point options

20

3 Interworking ARM and Thumb

22

3.1 About interworking

22

Interworking ARM and Thumb

23

3.2.3 Example ARM header

24

Building the example

25

3.2.4 ARM architecture v5T

25

3.2.5 Labels in Thumb code

26

C interworking example

27

5. Type go to run the code

31

String copying example

33

Operand expressions

33

Physical registers

33

4.1.4 Usage

35

4.1.5 Examples

36

Dot product

37

Long multiplies

37

• LDRB/STRB for char

39

• LDR/STR for int

39

C++ calling conventions

42

C++ data types

42

Symbol name mangling

43

4.4.3 Examples

43

Calling C from C++

44

Calling C++ from C

45

Handling Processor Exceptions

48

• the address of the handler

53

5.4 SWI handlers

55

Nested SWIs in C and C++

57

5.5 Interrupt handlers

61

• Single-channel DMA transfer

63

• Dual-channel DMA transfer

63

• Interrupt prioritization

63

• Context switch

63

Interrupt prioritization

64

Context switch

65

5.6 Reset handlers

67

5.8 Prefetch Abort handler

69

5.9 Data Abort handler

70

• A single extended handler

71

• Several chained handlers

71

Handling the exception

72

5.11.2 The return address

72

FIQ and IRQ handlers

73

Prefetch Abort handlers

73

Data Abort handlers

73

5.12 System mode

75

6 Writing Code for ROM

76

6.2.1 ROM at 0x0

77

6.2.2 RAM at 0x0

77

Implementing RAM at 0x0

77

System decoder

78

6.3 Initializing the system

79

6.4.1 Memory map

81

6.4.2 Sample code

82

• five execution regions:

83

6.5.3 Sample code

84

6.5.4 Building the example

88

Using the CodeWarrior IDE

89

Using the command line

89

6.6.1 Memory map

90

6.6.3 Initialization code

91

6.6.4 Building the example

91

6.7.1 Memory map

93

6.7.2 Building the example

93

6.7.3 Sample code

93

6.8.1 Memory map

97

6.8.2 Building the example

97

6.8.4 Sample code

98

6.9.2 Using unions

100

Using an array of shorts

100

Using a struct

100

6.9.4 Using scatter loading

101

6.9.5 Code efficiency

102

6.10 Troubleshooting

103

Writing Code for ROM

104

Code (or read-only) segments

105

Data (or read-write) segments

105

Debug data

105

7.1.1 About caches

106

ARMulator Pagetable model

106

7.1.4 Cache performance

107

7.3 Memory protection units

109

7.4 Configuring a PU

110

7.5 Memory management units

113

7.6 Configuring an MMU

115

7.7 Tightly coupled memory

117

7.7.3 ARM966E-S warm reset

118

Debug Communications Channel

120

8.4 Target transfer of data

123

• Using armsd

125

• Using AXD

125

Issuing commands

126

Using AXD

126

8.7 Access from Thumb state

129

8.8 Semihosting

130

Glossary

131

ARM dispositivi