user manual

Debugger General Information
B-38
B
Example: Trace one instruction using debugger.
177Bug>RD
PC =000E0000 SR =2700=TR:OFF_S._7_..... VBR =00000000
SSP* =00010000 USP =00010000 SFC =1=UD DFC =1=UD
CACR =00000000=D:....._B:..._I:... PCR =04300000
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 =000C0000 A6 =00000000 A7 =00010000 0000E
000 4E71 NOP 177Bug>
T
PC =00010006 SR =2700=TR:OFF_S._7_..... VBR =00000000
USP =0000DFFC MSP =0000EFFC ISP* =0000FFFC SFC =0=F0
DFC =0=F0 CACR =0=........
D0 =00000001 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 =0000FFFC
00010006 D280 ADD.L D0,D1
177Bug>
Table B-3. Exception Vectors Used by 177Bug
Vector
Offset Exception 177Bug Facility
$10 Illegal instruction Breakpoints (used by GO, GN, GT)
$24 Trace Trace operations (such as T, TC, TT)
$80-$B8 TRAP #0 - #14 Used internally
$BC TRAP #15 System calls
$Note Level 7 interrupt ABORT push-button
$Note Level 7 interrupt AC Fail
$DC FP Unimplemented Data
Type
Software emulation and data type
conversion of ßoating point data.
Note: Offsets marked ÒNoteÓ depend on what the Vector Base Register (VBR)
is set to in the VMEchip2.