Motorola M68CPU32BUG User Manual Page 27
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DEBUG MONITOR DESCRIPTION
M68CPU32BUG/D REV 1 2-11
EXAMPLE The user exception handler passes an exception along to the debugger.
*
*** EXCEPT - Exception handler ****
*
EXCEPT SUBQ.L #4,A7
Save space in stack for a PC value.
LINK A6,#0
Frame pointer for accessing PC space.
MOVEM.L A0-A5/D0-D7,-(A7)
Save registers.
: decide here if user code will handle exception, if so, branch...
MOVE.L BUFVBR,A0
Pass exception to debugger; Get VBR.
MOVE.W 14(A6), Do
Get the vector offset from stack frame.
AND.W #$0FFF,D0
Mask off the format information.
MOVE.L (A0,D0.W),4(A6)
Store address of debugger exception handler.
UNLK
A6
RTS
Put address of exception handler into PC and go.
2.5.2.3 CPU32Bug Generalized Exception Handler
The CPU32Bug generalized exception handler supervises all exceptions not listed in Table 2-2.
For these exceptions, the target stack pointer points to the top of the user exception stack frame.
In this way, if an unexpected exception occurs during user code segment execution, the exception
stack frame displays to assist in determining the cause of the exception.
EXAMPLE Bus error at address $F00000. It is assumed for this example that an access
of memory location $F00000 initiates bus error exception processing.
CPU32Bug>RD<CR>
PC =00003000 SR =2700=TR:OFF_S_7_.... VBR =00000000
SFC =5=SD DFC =5=SD USP =0000FC00 SSP* =00004000
D0 =00000000 D1 =00000000 D2 =00000000 D3 =00000000
D4 =00000000 D5 =00000000 D6 =00000000 D7 =00000000
A0 =00000000 A1 =00000000 A2 =00000000 A3 =00000000
A4 =00000000 A5 =00000000 A6 =00000000 A7 =00004000
00003000 203900F0 0000 MOVE.L ($F00000).L,D0
CPU32Bug>T<CR>
Exception: Bus Error
Format/Vector=C008
SSW=0065 Fault Addr.=00F00000 Data=FFFF3000 Cur. PC=00003000 Cnt. Reg.=0001
PC =00003000 SR =A700=TR:ALL_S_7_.... VBR =00000000
SFC =5=SD DFC =5=SD USP =0000FC00 SSP* =00003FE8
D0 =00000000 D1 =00000000 D2 =00000000 D3 =00000000
D4 =00000000 D5 =00000000 D6 =00000000 D7 =00000000
A0 =00000000 A1 =00000000 A2 =00000000 A3 =00000000
A4 =00000000 A5 =00000000 A6 =00000000 A7 =00003FE8
00003000 203900F0 0000 MOVE.L ($F00000).L,D0
CPU32Bug>
- M68CPU32BUG DEBUG MONITOR 1
- USER’S MANUAL 1
- M68CPU32BUG/D 1
- TABLE OF CONTENTS 3
- M68CPU32BUG/D REV 1 ii 4
- M68CPU32BUG/D REV 1 iii 5
- M68CPU32BUG/D REV 1 iv 6
- M68CPU32BUG/D REV 1 v 7
- LIST OF FIGURES 8
- LIST OF TABLES 8
- CHAPTER 1 9
- 1.1 INTRODUCTION 9
- 1.2 GENERAL DESCRIPTION 9
- GENERAL INFORMATION 10
- M68CPU32BUG/D REV 1 1-2 10
- 1.3 USING THIS MANUAL 11
- 1.5 SYSTEM RESTART 12
- 1.6 MEMORY REQUIREMENTS 13
- Figure 1-2. BCC Memory Map 14
- M68CPU32BUG/D REV 1 1-7 15
- M68CPU32BUG/D REV 1 1-8 16
- CHAPTER 2 17
- DEBUG MONITOR DESCRIPTION 17
- 2.1 INTRODUCTION 17
- M68CPU32BUG/D REV 1 2-2 18
- M68CPU32BUG/D REV 1 2-3 19
- M68CPU32BUG/D REV 1 2-4 20
- M68CPU32BUG/D REV 1 2-5 21
- M68CPU32BUG/D REV 1 2-6 22
- M68CPU32BUG/D REV 1 2-7 23
- M68CPU32BUG/D REV 1 2-8 24
- M68CPU32BUG/D REV 1 2-9 25
- M68CPU32BUG/D REV 1 2-10 26
- M68CPU32BUG/D REV 1 2-11 27
- 2.6 FUNCTION CODE SUPPORT 28
- M68CPU32BUG/D REV 1 2-13 29
- M68CPU32BUG/D REV 1 2-14 30
- CHAPTER 3 31
- 3.1 INTRODUCTION 31
- M68CPU32BUG/D REV 1 3-2 32
- BC Block of Memory Compare BC 33
- BF Block of Memory Fill BF 35
- BM Block of Memory Move BM 37
- BR Breakpoint Insert BR 39
- BS Block of Memory Search BS 40
- BV Block of Memory Verify BV 43
- DC Data Conversion DC 45
- DU Dump S-Records DU 46
- M68CPU32BUG/D REV 1 3-19 49
- M68CPU32BUG/D REV 1 3-20 50
- GN Go To Next Instruction GN 51
- GO Go Execute User Program GO 53
- M68CPU32BUG/D REV 1 3-26 56
- M68CPU32BUG/D REV 1 3-27 57
- HE Help HE 58
- M68CPU32BUG/D REV 1 3-31 61
- M68CPU32BUG/D REV 1 3-32 62
- M68CPU32BUG/D REV 1 3-33 63
- MA Macro Define/Display MA 64
- MAE Macro Edit MAE 67
- M68CPU32BUG/D REV 1 3-39 69
- MD Memory Display MD 70
- MM Memory Modify MM 72
- MS Memory Set MS 74
- M68CPU32BUG/D REV 1 3-45 75
- M68CPU32BUG/D REV 1 3-46 76
- M68CPU32BUG/D REV 1 3-47 77
- PA Printer Attached PA 78
- PF Port Format PF 79
- RD Register Display RD 82
- RESET Cold/Warm Reset RESET 86
- RM Register Modify RM 87
- RS Register Set RS 88
- SD Switch Directories SD 89
- T Trace T 90
- M68CPU32BUG/D REV 1 3-63 93
- Trace on change of flow: 94
- TM Transparent Mode TM 95
- M68CPU32BUG/D REV 1 3-66 96
- M68CPU32BUG/D REV 1 3-67 97
- M68CPU32BUG/D REV 1 3-68 98
- M68CPU32BUG/D REV 1 3-69 99
- DEBUG MONITOR COMMANDS 100
- M68CPU32BUG/D REV 1 3-70 100
- M68CPU32BUG/D REV 1 3-71 101
- M68CPU32BUG/D REV 1 3-72 102
- CHAPTER 4 103
- ASSEMBLER/DISASSEMBLER 103
- 4.1 INTRODUCTION 103
- 4.2SOURCE PROGRAM CODING 104
- M68CPU32BUG/D 4-3 105
- M68CPU32BUG/D 4-4 106
- Pseudo Registers 107
- Main Processor Registers 107
- M68CPU32BUG/D 4-6 108
- M68CPU32BUG/D 4-7 109
- M68CPU32BUG/D 4-8 110
- M68CPU32BUG/D 4-9 111
- M68CPU32BUG/D 4-10 112
- M68CPU32BUG/D 4-11 113
- 0000D000 6000BF68 BRA *-4096 114
- 0000D000 60FE BRA.B * 114
- 0000D000 4EF90000 D000 JMP * 114
- CHAPTER 5 115
- SYSTEM CALLS 115
- 5.1 INTRODUCTION 115
- 5.2 SYSTEM CALL ROUTINES 116
- M68CPU32BUG/D REV 1 5-3 117
- M68CPU32BUG/D REV 1 5-4 118
- M68CPU32BUG/D REV 1 5-5 119
- COUNT = 3 120
- COUNT = 3? 5<CR> 120
- COUNT = 5 120
- COUNT = 3? <CR> 120
- SYSCALL .CHKBRK 121
- BEQ BREAK 121
- M68CPU32BUG/D REV 1 5-8 122
- M68CPU32BUG/D REV 1 5-9 123
- .ERASLN Erase Line .ERASLN 124
- SYSCALL .INCHR Call .INCHR 125
- M68CPU32BUG/D REV 1 5-12 126
- M68CPU32BUG/D REV 1 5-13 127
- M68CPU32BUG/D REV 1 5-14 128
- MOVE.B D0,-(A7) 129
- Send character in D0 129
- SYSCALL .OUTCHR 129
- To default output port 129
- .OUTSTR .OUTSTR 130
- M68CPU32BUG/D REV 1 5-17 131
- PEA (A0) 132
- Long buffer address 132
- SYSCALL .READLN 132
- M68CPU32BUG/D REV 1 5-19 133
- SYSCALL .RETURN 134
- Return to CPU32Bug 134
- .SNDBRK Send Break .SNDBRK 135
- M68CPU32BUG/D REV 1 5-22 136
- SYSCALL .TM_INI 137
- Initialize timer 137
- .TM_RD Read Timer .TM_RD 138
- SYSCALL .TM_STR0 139
- Start Timer at T=0 .TM_STR0 140
- .WRITDLN .WRITDLN 141
- .WRITELN .WRITELN 143
- CHAPTER 6 145
- DIAGNOSTIC FIRMWARE GUIDE 145
- 6.1 INTRODUCTION 145
- 6.2 DIAGNOSTIC MONITOR 145
- M68CPU32BUG/D REV 1 6-2 146
- M68CPU32BUG/D REV 1 6-3 147
- 6.3 UTILITIES 148
- M68CPU32BUG/D REV 1 6-5 149
- CPU CPU Tests For The MCU CPU 150
- CPU A Register Test CPU A 151
- CPU B Instruction Test CPU B 152
- CPU C Address Mode Test CPU C 153
- M68CPU32BUG/D REV 1 6-10 154
- MT Memory Tests MT 155
- M68CPU32BUG/D REV 1 6-12 156
- MT A Set Function Code MT A 157
- MT B Set Start Address MT B 158
- MT C Set Stop Address MT C 159
- MT D Set Bus Data Width MT D 160
- MT E March Address Test MT E 161
- MT F Walk a Bit Test MT F 162
- MT G Refresh Test MT G 163
- MT H Random Byte Test MT H 164
- MT I Program Test MT I 165
- MT J Test and Set Test MT J 166
- BERR Bus Error Test BERR 167
- M68CPU32BUG/D REV 1 6-24 168
- APPENDIX A 169
- S-RECORD INFORMATION 169
- A.1 INTRODUCTION 169
- A.2 S-RECORD CONTENT 169
- A.3 S-RECORD TYPES 170
- A.4 S-RECORDS CREATION 171
- M68CPU32BUG REV 1 A-4 172
- APPENDIX B 173
- SELF-TEST ERROR MESSAGES 173
- B.1 INTRODUCTION 173
- M68CPU32BUG REV 1 B-2 174
- APPENDIX C 175
- USER CUSTOMIZATION 175
- C.1 INTRODUCTION 175
- C.2 CPU32BUG CUSTOMIZATION 176
- M68CPU32BUG REV 1 C-3 177
- C>DEL TMP.MX<CR> 178
- C>DEL C32B1.MX<CR> 178
- C.3 CUSTOMIZATION TABLE 179
- M68CPU32BUG REV 1 C-6 180
- M68CPU32BUG REV 1 C-7 181
- ROM AUTO BOOT VECTORS 182
- Periodic Interrupt Timer 183
- M68CPU32BUG REV 1 C-10 184
- M68CPU32BUG REV 1 C-11 185
- M68CPU32BUG REV 1 C-12 186
- M68CPU32BUG REV 1 C-13 187
- C.4 COMMUNICATION FORMATS 188
- M68CPU32BUG REV 1 C-15 189
- M68CPU32BUG REV 1 C-16 190
- Platform Board 191
- M68CPU32BUG REV 1 C-18 192
- Offset Value Comment 193
- M68CPU32BUG REV 1 C-20 194
- M68CPU32BUG REV 1 C-21 195
- M68CPU32BUG REV 1 C-22 196
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