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Inside Macintosh: PowerPC System Software /

Chapter 4 - Exception Manager / Exception Manager Reference

Constants

Memory Reference Kinds

For each memory-related exception, the Exception Manager returns a memory exception record. The theReference field of that record contains a memory reference code that indicates the kind of memory operation that caused the exception.

enum {
   /*memory reference codes*/
   writeReference                = 0,     /*write operation*/
   readReference                 = 1,     /*read operation*/
   fetchReference                = 2      /*fetch operation*/
};

Constant descriptions

writeReference

The operation was an attempt to write data to memory.

readReference

The operation was an attempt to read data from memory.

fetchReference

The operation was an attempt to fetch a processor instruction. (Not all processors are able to distinguish read operations from fetch operations. As a result, fetch operation failures might instead be reported as failed read operations.)