AT&T 3B2/300 Technical Reference Manual page 302

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FAULT TYPE
Bits 04-00 are the FAULT TYPE that occurred. The decode of bits 04-00 indicate
the following. Unassigned fault type values are not included.
BITS 04-00 FAULT NAME
00000 NO FAULT
00001 MISPROCESSING MEMORY
00010
REFERENCE/MODIFIED UPDATE MEMORY
00011
SEGMENT DESCRIPTOR TABLE LENGTH
00100 PAGE WRITE
00101
PAGE DESCRIPTOR TABLE LENGTH
00110 INVALID SEGMENT DESCRIPTOR
00111 SEGMENT NOT PRESENT
01000 OBJECT TRAP
01001 PAGE DESCRIPTOR TABLE NOT PRESENT
01010 PAGE NOT PRESENT
01011 TOO MANY INDIRECTIONS
01101 ACCESS
01110 SEGMENT OFFSET
01111 ACCESS AND SEGMENT OFFSET
11111 DOUBLE PAGE HIT
Fault Address Register
The Fault Address Register (FLTAR) contains the virtual address that was being processed when the
last fault that caused a write to the FLTCR and FLTAR occurred. The contents are changed when the
CPU writes to it in the peripheral mode. The output of the /etc/errdump command includes the
FLTAR.
FUNCTIONAL DESCRIPTION 3-49