3.10 Machine Checks
A machine check is an exception that indicates a processor-
detected internal error. Figure 3–8 shows the parameters
that are pushed on the stack in response to a machine check.
Table 3–8 lists these parameters.
Figure 3–8: The Stack in Response to a Machine Check
BYTE COUNT (0010 hex)
MACHINE CHECK CODE
MOST RECENT VIRTUAL ADDRESS
INTERNAL STATE INFORMATION #2
INTERNAL STATE INFORMATION #1
PC
PSL
msb-0053-89
SP:
SP+4:
SP+8:
SP+C:
SP+10:
SP+14:
SP+18:
Table 3–8: Machine Check Parameters
Parameter Value Description
Machine check code (hex)
(SP+4)
1 Floating-point protocol error
2 Floating-point reserved instruction
3 Floating-point unknown error
4 Floating-point unknown error
5 Process PTE in P0 space during TB miss
flows
6 Process PTE in P1 space during TB miss
flows
7 Process PTE in P0 space during
M = 0 flows
3–36 VAX 6000 Models 300 and 400 Service Manual
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