ARM Cortex-A53 MPCore - Page 301

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ARM DDI 0500D Copyright © 2013-2014 ARM. All rights reserved. 4-240
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Table 4-216 shows the DFSR bit assignments when using the Short-descriptor translation table
format.
Table 4-216 DFSR bit assignments for Short-descriptor translation table format
Bits Name Function
[31:14] - Reserved,
RES0.
[13] CM Cache maintenance fault. For synchronous faults, this bit indicates whether a cache maintenance operation
generated the fault:
0 Abort not caused by a cache maintenance operation.
1 Abort caused by a cache maintenance operation.
[12] ExT External abort type. This field indicates whether an AXI Decode or Slave error caused an abort:
0 External abort marked as DECERR.
1 External abort marked as SLVERR.
For aborts other than external aborts this bit always returns 0.
[11] WnR Write not Read bit. This field indicates whether the abort was caused by a write or a read access:
0 Abort caused by a read access.
1 Abort caused by a write access.
For faults on CP15 cache maintenance operations, including the VA to PA translation operations, this bit always
returns a value of 1.
[10] FS[4] Part of the Fault Status field. See bits [3:0] in this table.
[9] - RAZ.
[8] - Reserved, RES0.
[7:4] Domain Specifies which of the 16 domains, D15-D0, was being accessed when a data fault occurred.
For permission faults that generate Data Abort exception, this field is
UNKNOWN. ARMv8 deprecates any use of
the domain field in the DFSR.
[3:0] FS[3:0] Fault Status bits. This field indicates the type of exception generated. Any encoding not listed is reserved:
0b00001 Alignment fault.
0b00010 Debug event.
0b00011 Access flag fault, section.
0b00100 Instruction cache maintenance fault.
0b00101 Translation fault, section.
0b00110 Access flag fault, page.
0b00111 Translation fault, page.
0b01000 Synchronous external abort, non-translation.
0b01001 Domain fault, section.
0b01011 Domain fault, page.
0b01100 Synchronous external abort on translation table walk, first level.
0b01101 Permission fault, section.
0b01110 Synchronous external abort on translation table walk, second level.
0b01111 Permission fault, second level.
0b10000 TLB conflict abort.
0b10101 LDREX or STREX abort.
0b10110 Asynchronous external abort.
0b11000 Asynchronous parity error on memory access.
0b11001 Synchronous parity error on memory access.
0b11100 Synchronous parity error on translation table walk, first level.
0b11110 Synchronous parity error on translation table walk, second level.