Motorola M68000 User's Guide Page 236
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222 Assembly Language Programming for the 68000 Family
; Macintosh shell.
;****************************************
t
; The following include files ace needed:
t
Include MacTraps.D
Include SysEqu .D
?
xdef
Start
;starting address
t
; Equates
WIND TOP
equ 40
;window coordinates (GLOBAL)
WIND LEFT
equ 4
$
WIND_B0T
equ 338
t
WIND_RIGHT equ 508
i
WINDHEIGHT
equ WIND
BOT-WIND TOP ;window dimensions
WINDWIDTH equ
WIND
_RIGHT-WIND_LEFT
LMARG equ
6
;left margin
RMARG
equ WINDWIDTH-10 }right
TMARG equ 15
;top
BMARG equ
WINDHEIGHT-15 ;bottom
BS
equ
8
;ASCII backspace
CR
equ
13
;ASCII car ret
LF
equ 10 ;ASCII If
DASH
equ
45
;ASCII minus sign
ZERO
equ 48
;ASCII character for digit zero
NINE
equ 57
;ASCII character for digit nine
TRUE
equ 1
;boolean true
FALSE equ 0
;boolean false
FONTNUM
equ
4
;default font code
FONTSTYLE equ 0
;plain style
FONTSIZE
equ
9
;default font size
ASCENT equ 0
;offsets of fields in Fontinfo
DESCENT equ
2
;
WIDMAX
equ 4
0
LEADING
equ
6
?
; The window coordinates in
local coordinates
WBoundsRect:
dc.w WIND
TOP,WIND LEFT,WIND BOT,WIND RIGHT
WScrollRect:
dc.w 0,0,
WINDHEIGHT,WINDWIDTH
ScrollRgnH:
dc.l
0
;handle for scroll region
Fontlnfo:
dcb.w
4,0
;buffer for record ret. by _GetFontlnfo
LineHt:
dc.w
0
;buffer for height of line
WindowPointer:
;
EventRec:
dc.l
0
;pointer to the window
ds.l
4
;event record
?
Title:
dc.b
16,'
Macintosh shell.1
t
; Initialization code. Set up everything.
- ^UcMttaL P. SizUuijeS i 1
- A55EMBLY LANGUAGE 3
- PROGRAMMING TOR 3
- THE 68000 FAMILY 3
- ASSEMBLY LANGUAGE 5
- PROGRAMMING FOR 5
- TNE 68000 FAMILY 5
- To my wife Linda 7
- CONTENTS 11
- CHAPTER 8: Subroutines 99 12
- Contents xl 13
- INTRODUCTION 15
- Introduction 3 17
- NUMBER SYSTEMS 19
- Conversions 20
- Number Systems 7 21
- Hexadecimal 22
- 2. We can go from binary 23
- 2 is F0Ai6 23
- 2 gives us: 23
- Representing Negative Values 25
- ASCII Character Codes 26
- 21. binary 29
- CHAPTER 2 31
- ADDRESS MEMORY 35
- User and Supervisor Modes 37
- The CPU Registers 38
- User Programmer's Model 39
- Input/Output 40
- ASSEMBLER SOURCE FORMAT 43
- The Label Field 44
- The Operation Field 46
- The Operand Field 46
- The Comment Field 47
- On Choosing Symbols 48
- Constants 48
- $1100111001 11001110012 49
- Data-Defining Directives 50
- Symbol Equates 51
- The END Directive 52
- Assembler Source Format 39 53
- CHAPTER 4 55
- Data Movement 55
- Getting Started 43 57
- Addition and Subtraction 58
- Getting 5tarted 45 59
- Input and Output 61
- The Program Shell 63
- Getting Started 51 65
- Putting It All Together 67
- Getting 5tarted 55 69
- #'0',DO 70
- 19. SUB.L D1,D0 70
- CHAPTER 5 71
- CONDITION CODE REGISTER 72
- The Carry Bit 72
- 11101001 73
- + 10110111 73
- 110100000 73
- The Overflow Bit 75
- The Zero and negative Bits 75
- The Extend Bit 76
- Com parisons 76
- CHP.L DirDO 78
- BLE LABEL 78
- ADDQ and SUBQ Instructions 80
- MOVEQ #100,DO 81
- MOVE.L #100,DO 81
- BGE LABEL 84
- ADDRESSING MODES 85
- Register Direct Modes 86
- Im mediate Data 86
- Absolute Addressing 87
- Address Register Indirect 88
- Addressing Modes 75 89
- Addressing Modes 77 91
- Addressing Modes 79 93
- Addressing Modes 81 95
- Addressing Modes 83 97
- Addressing Mode Summary 98
- Addressing Modes 87 101
- CHAPTER 7 103
- Stack Instructions 103
- HIGH ADDRESS 104
- LOU ADDRESS 104
- The 5tach 91 105
- LOW ADDRESS 106
- Stack Applications 107
- The Stack 95 109
- Exercises 110
- PEA COUNT 111
- CHAPTER 8 113
- Subroutines 101 115
- Passing Param eters 116
- Subroutines 103 117
- ARG2: DS.L 118
- Subroutines 105 119
- Subroutines 107 121
- ADDA. L # 1 2 ,SP 122
- Stack Fram es 123
- ID BYTES OF LOCALS 124
- Subroutines 111 125
- Subroutines 113 127
- Subroutines 115 129
- CHAPTER 9 131
- * Q 139
- CHAPTER 10 143
- Logical Operations 144
- 01000100 145
- LSL'ASL 147
- Bit Manipulation 151
- BTSTr BSET, BCLR, BCBG 152
- Operand 1 153
- Operand 2 153
- CHAPTER 11 155
- Advanced Arithmetic 143 157
- Multiplication and Division 159
- 11100001 160
- Advanced Arithmetic 147 161
- Decimal Arithmetic 162
- Advanced Arithmetic 149 163
- Advanced Arithmetic 151 165
- 10000 0000 165
- Advanced Arithmetic 153 167
- EXCEPTION PROCESSING 169
- SYSTEM CONTROL 169
- OPERATIONS, AND I/O 169
- OVFLs DS.B 1 171
- OVERFLOW FLAG BYTE 171
- Exception Processing 172
- TRAP #<vector> 175
- ADD.L DO fDl 176
- CHK <ea>,Dn 176
- Serial I/O 177
- I I I I I I I I I I 178
- Miscellaneous Instructions 182
- 8. l e a u s t a c k ,a o 185
- C m P T f fl 15 187
- MOVE.L (AO)+,MEMLOC 188
- Virtual Machines 189
- Virtual Address Space 190
- Physical Memory 190
- Reference Classifications 191
- The Vector Base Register 192
- RTD and Loop Mode 193
- Summ ary 195
- 9. MOVE CCR,DO 196
- PC0, FC1, and FC2 196
- The 68010 183 197
- CHAPTER 1 4 199
- Instruction Caching 200
- The 68020 187 201
- Additional Addressing Modes 202
- The 68020 189 203
- MOVE.W #24,DO 203
- MOVE.L (0,A0,D0.W*4),D1 203
- Instruction Extensions 204
- The 68020 191 205
- Hew Instructions 207
- The 68020 195 209
- CAS Dc,Du,<ea> 210
- The 68020 197 211
- The 68020 201 215
- CHAPTER 15 217
- Instruction and Data C aches 218
- The 68030 205 219
- Pipelined Architecture 220
- Paged Memory Management 220
- requires 10 bits, leaving 221
- The 68030 209 223
- B-level tables 224
- "1 TT1 225
- 68030 Instructions 225
- The 68030 213 227
- ASCII CHARACTER CODES 229
- PROGRAM SHELLS AND 231
- I/O SUBROUTINES 231
- ! tSt.l dO 232
- Appendix B 219 233
- Appendix B 221 235
- ;plain style 236
- Appendix B 225 237
- ; return; 238
- Appendix B 227 241
- 68000-68020 243
- 0 S 0 S 244
- 0 S S 0 0 Test Operand 246
- 00000 Unlink 246
- 00000 UnPack BCD 246
- Appendix C 233 247
- 236 Index 250
- Index 237 251
- 238 Index 252
- Index 239 253
- ^ U a m a i P 256
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