[PATCH v1 3/5] cpukit/aarch64: Add Exception Manager support

[Sebastian Huber]

On 01/09/2021 17:48, Sebastian Huber wrote:
> So, my proposal would be something like this:
> 
> 1. Processor jumps to exception prologue
> 
> 2. Exception prologue saves the context to CPU exception frame
> 
> 3. Exception prologue calls rtems_fatal() which does not return
> 
> For the signal mapping you provide a fatal extension:
> 
> 1. If the source is not RTEMS_FATAL_SOURCE_EXCEPTION, then return 
> (system terminates).
> 
> 2. If the exception type cannot be handled, then return (system 
> terminates).
> 
> 3. Add a post-switch action to the executing thread.
> 
> 4. Call _CPU_Exception_return( frame )
> 
> The  _CPU_Exception_return( frame ) should:
> 
> 1. Save the CPU exception return information to the stack of the 
> executing thread.
> 
> 2. Switch to the stack of the executing thread and to thread context 
> with interrupts disabled.
> 
> 3. Do something similar to the interrupt return.
> 
> 4. The thread dispatch will call the post-switch extension which could 
> raise a signal.
> 
> This approach avoids a new user extension and it avoids a potentially 
> dead code in the exception epilogue.

Chris, I guess you have something like this

_CPU_Exception_return( frame )

in libdebugger currently?

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