Central Processing Unit
MPC561/MPC563 Reference Manual, Rev. 1.2
3-56
Freescale Semiconductor
When a floating-point exception is taken, instruction execution resumes at offset 0x0E00 from the base
address indicated by MSR[IP].
3.15.4.13 Implementation-Dependent Software Emulation Exception (0x1000)
An implementation-dependent software emulation exception occurs in the following instances:
•
When executing any non-implemented instruction. This includes all illegal and unimplemented
optional instructions and all floating-point instructions.
•
When executing a mtspr or mfspr instruction that specifies an un-implemented
internal-to-the-processor SPR, regardless of the value of bit 0 of the SPR.
•
When executing a mtspr or mfspr that specifies an un-implemented external-to-the-processor
register and SPR0 = 0 or MSR[PR] = 0 (no program interrupt condition).
shows the register settings set when a software emulation exception occurs.
Save/Restore Register 1 (SRR1)
1:4
Cleared to 0
10:15
Cleared to 0
Other
Loaded from bits [16:31] of MSR. In the current
implementation, bit 30 of the SRR1 is never cleared, except by
loading a zero value from MSR[RI]
Machine State Register (MSR)
IP
No change
ME
No change
LE
Bit is copied from ILE
DCMPEN
This bit is set according to (BBCMCR[EN_COMP] AND
BBCMCR[EXC_COMP])
Other
Cleared to 0
1
If the exception occurs during an instruction fetch in Decompression On mode, the SRR0 register will contain a
compressed address.
Table 3-34. Register Settings following a Software Emulation Exception
Register Name
Bits
Description
Save/Restore Register 0 (SRR0)
1
All
Set to the effective address of the instruction that caused the
interrupt
Save/Restore Register 1 (SRR1)
1:4
Cleared to 0
10:15
Cleared to 0
Other
Loaded from bits [16:31] of MSR. In the current
implementation, bit 30 of the SRR1 is never cleared, except by
loading a zero value from MSR[RI].
Table 3-33. Register Settings following Floating-Point Assist Exceptions
Register Name
Bits
Description
Summary of Contents for MPC561
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