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90 SPARC JPS1 Implementation Supplement: Fujitsu SPARC64 V • Release 1.0, 1 July 2002
■
X1: The contents of the context field of the D-MMU Tag Access Register are
undefined after a
data_access_exception
.
■
X2: I-SFSR is updated according to its update policy described in Section F.10.9
■
X3: D-SFSR and D-SFAR are updated according to the update policy described
in Section F.10.9
The traps with Ref #1~8 in
TABLE F-2
conform to the specification defined in Section
F.5 of Commonality.
The additional traps (Ref #9 and #10) are described below.
Ref 9: instruction_access_error
— Signalled upon detection of at least one of the
following errors.
■
An uncorrectable error is detected upon an instruction fetch reference.
■
A bus error response from the UPA bus is detected upon an instruction fetch
reference.
■
mITLB (sITLB and fITLB) multiple hits are detected in a mITLB lookup for an
instruction reference.
■
An fITLB entry parity error is detected in an fTLB lookup for an instruction
reference.
Ref 10: data_access_error
— Signalled upon the detection of at least one of the
following errors.
■
An uncorrectable error is detected upon an instruction operand access.
■
A bus error response from the UPA bus is detected upon an operand access.
■
mDTLB (sDTLB and fDTLB) multiple hits are detected in an mDTLB lookup for
an operand access.
2.
instruction_access_exception
Several (see below) X2 X 08
16
3.
fast_data_access_MMU_miss
D-TLB miss X3 X 68
16
–6B
16
4.
data_access_exception
Several (see below) X3 X1 30
16
5.
fast_data_access_protection
Protection violation X3 X 6C
16
-6F
16
6.
privileged_action
Use of privileged ASI X3 37
16
7. watchpoint Watchpoint hit X3 61
16
–62
16
8.
mem_address_not_aligned
,
*_mem_address_not_aligned
Misaligned memory
operation
(impl.
dep
#237)
35
16
, 36
16
,
38
16
, 39
16
9.
instruction_access_error
Several (see below) X2 0A
16
10
data_access_error
Several (see below) X3 32
16
TABLE F-2
MMU Trap Types, Causes, and Stored State Register Update Policy
Registers Updated
(Stored State in MMU)
Ref #Trap Name Trap Cause I-SFSR
I-MMU
Tag
Access
D-SFSR,
SFAR
D-MMU
Tag
Access Trap Type