Interrupts and Exceptions
PowerPC e500 Core Family Reference Manual, Rev. 1
Freescale Semiconductor 5-7
An implementation may define additional ESR bits to identify implementation-specific or
architected interrupt types; the EIS defines ESR[ILK] and ESR[SPE].
NOTE
System software may need to identify the type of instruction that
caused the interrupt and examine the TLB entry and ESR to fully
identify the exception or exceptions. For example, because both
protection violation and byte-ordering exception conditions may be
present, and either causes a data storage interrupt, system software
would have to look beyond ESR[BO], such as the state of MSR[PR]
in SRR1 and the TLB entry page protection bits, to determine if a
protection violation also occurred.
Table 5-4 shows MCSR bit definitions. Section 5.7.2.1, “Core Complex Bus (CCB) and L1 Cache
Machine Check Errors,” provides information about machine check recoverability.
46 BO Byte-ordering exception Data storage, instruction
storage
47–55 — Reserved, should be cleared. —
56 SPE SPE exception bit. Book E allocates this bit for implementation-dependent use,
so it may have different functions on other implementations.
—
57–63 — Allocated for implementation-dependent use. Reserved, should be cleared. —
1
Book E defines bit 45 as PUO (unimplemented operation exception). On the e500, unimplemented instructions are handled
as illegal instructions.
Table 5-4. Machine Check Syndrome Register (MCSR) Field Descriptions
Bits Name Description
32 MCP Machine check input signal
33 ICPERR Instruction cache parity error
34 DCP_PERR Data cache push parity error
35 DCPERR Data cache parity error
36–55 — Reserved, should be cleared.
56 BUS_IAERR Bus instruction address error
57 BUS_RAERR Bus read address error
58 BUS_WAERR Bus write address error
59 BUS_IBERR Bus instruction data bus error
60 BUS_RBERR Bus read data bus error
61 BUS_WBERR Bus write bus error
62 BUS_IPERR Bus instruction parity error
63 BUS_RPERR Bus read parity error
Table 5-3. Exception Syndrome Register (ESR) Definition (continued)
Bits Name Syndrome Interrupt Types
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