Sun Microsystems UltraSPARC-I - Page 174

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8. Address Spaces, ASIs, ASRs, and Traps
1.
Priority 1 traps are processed in the following order: XIR>WDR>SIR>RED.
2.
Fp_exception_ieee_754 , fp_exception_other are mutually exclusive with memory access traps such as privileged_action
and VA_watchpoint . Privileged_action has higher priority than VA_watchpoint .
3.
Priority 12 traps are processed in the following program order: data_access_exception >
fast_data_access_MMU_miss / fast_data_access_protection > PA_watchpoint > data_access_error .
4.
Priority 10 traps are processed in the following order: LDDF/STDF_mem_address_not_aligned >
mem_address_not_aligned trap. LDDF/ STDF_mem_address_not_aligned traps are mutually exclusive.
5.
Priority 16 traps are processed in the following order: trap instruction > interrupt_vector .
6.
When an MMU fault is detected during an instruction access, a fast_instruction_access_MMU_miss trap is generated
instead of an
instruction_access_MMU_miss trap.
7.
A fast_data_access_MMU_miss trap is generated instead of a data_access_MMU_miss trap.
8.
A fast_data_access_protection trap is generated instead of a data_access_protection trap.
9.
AG = alternate globals, MG = MMU globals, IG = interrupt globals
illegal_instruction AG 010
16
7
10
privileged_opcode
AG 011
16
6
fp_disabled AG 020
16
8
fp_exception_ieee_754 AG 021
16
11
2
fp_exception_other AG 022
16
11
2
tag_overflow AG 023
16
14
clean_window AG 024
16
..027
16
10
division_by_zero AG 028
16
15
data_access_exception MG 030
16
12
3
data_access_error AG 032
16
12
3
mem_address_not_aligned AG 034
16
10
4, 10
LDDF_mem_address_not_aligned AG 035
16
10
4
STDF_mem_address_not_aligned AG 036
16
10
4
privileged_action AG 037
16
11
2
interrupt_level_n (n=1..15) AG 041
16
..04F
16
32–n
interrupt_vector IG 060
16
16
5
PA_watchpoint AG 061
16
12
5
VA_watchpoint AG 062
16
11
2
corrected_ECC_error AG 063
16
33
fast_instruction_access_MMU_miss MG 064
16
..067
16
2
6
fast_data_access_MMU_miss MG 068
16
..06B
16
12
3,7
fast_data_access_protection MG 06C
16
..06F
16
12
3,8
spill_n_normal (n=0..7) AG 080
16
..09F
16
9
spill_n_other (n=0..7) AG 0A0
16
..0BF
16
9
fill_n_normal (n=0..7) AG 0C0
16
..0DF
16
9
fill_n_other (n=0..7) AG 0E0
16
..0FF
16
9
trap_instruction AG 100
16
..17F
16
16
5
Table 8-6 Traps Supported in UltraSPARC (Continued)
Exception or Interrupt Request Globals
9
TT Priority
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