10.2.1. Synchronous aborts

Synchronous exceptions can occur for a number of possible reasons:

Such exceptions may be part of the normal operation of the OS. For example, in Linux, when a task wishes to request allocation of a new memory page, this is handled through the MMU abort mechanism.

In the ARMv7-A architecture, the prefetch abort, Data Abort and undef exceptions are separate items. In AArch64, all of these events generate a Synchronous abort. The exception handler may then read the syndrome and FAR registers to obtain the necessary information to distinguish between them (described in more detail later.)

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