Motorola MVME147 Installation And Use Manual page 188

Debugger General Information
B
B-34
Table B-5. Exception Vectors Used by 147Bug
Vector
Offset Exception
$8 Bus Error
$10 Illegal instruction Breakpoints (used by GO, GN, GT)
$24 Trace
$108 Level 7 Interrupt
$BC TRAP #15
Example:
Trace one instruction using debugger.
RD
147Bug>
PC =00004000 SR =2700=TR:OFF_S._7_.....
USP =00005830 MSP =00005C18 ISP* =00006000 SFC
CACR =0=D:...._I:...
D0 =00000000 D1 =00000000 D2
D4 =00000000 D5 =00000000 D6
A0 =00000000 A1 =00000000 A2
A4 =00000000 A5 =00000000 A6
00004000 7055
T
147Bug>
PC =00004002 SR =2700=TR:OFF_S._7_.....
USP =00005830 MSP =00005C18 ISP* =00006000 SFC
CACR =0=D:...._I:...
D0 =00000055 D1 =00000000 D2
D4 =00000000 D5 =00000000 D6
A0 =00000000 A1 =00000000 A2
A4 =00000000 A5 =00000000 A6
00004002 4E71
147Bug>
Notice that the value of the target stack pointer register (A7) has not
changed even though a trace exception has taken place. Your
program may either use the exception vector table provided by
147Bug or it may create a separate exception vector table of its own.
The two following sections detail these two methods.
147Bug Facility
Trace operations (such as T, TC, TT)
ABORT pushbutton
System calls
VBR
CAAR =00000000 DFC
=00000000 D3
=00000000 D7
=00000000 A3
=00000000 A7
MOVEQ.L #$55,D0
VBR
CAAR =00000000 DFC
=00000000 D3
=00000000 D7
=00000000 A3
=00000000 A7
NOP
=00000000
=0=F0
=0=F0
=00000000
=00000000
=00000000
=00006000
=00000000
=0=F0
=0=F0
=00000000
=00000000
=00000000
=00006000