[PATCH v1 1/3] cpukit: Add signal mapping support

[Sebastian Huber]

On 20/04/2021 07:30, Chris Johns wrote:

> We need a way for libdebugger or any other piece of software to capture and
> cascade the call. If this can be done on aarch64 then I am happy.

The fatal error extensions execute in a user controllable order. You can 
for example register a libdebugger handler which deals with break point 
exceptions before the signal mapping handler is called.

Synchronous exceptions should end up in an RTEMS_FATAL_SOURCE_EXCEPTION 
fatal error. The fatal code is a pointer to rtems_exception_frame 
(CPU_Exception_frame). In this data structure should be the complete 
state of the interrupted context (which could be also an interrupt 
handler). If you want to resume execution of the interrupted context, 
then we need an API for this (setters/getters and some sort of a longjmp()).

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