Motorola MVME177 manual Table B-3. Exception Vectors Used by 177Bug

B

Debugger General Information

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	Software emulation and data type
	Type	conversion of ßoating point data.

Note: Offsets marked ÒNoteÓ depend on what the Vector Base Register (VBR) is set to in the VMEchip2.

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>

B-38