Wrap Interrupt Handlers for Recording?

[Chris Johns]

On 5/9/19 2:09 am, Sebastian Huber wrote:
> Hello,
> 
> I would like to wrap calls to interrupt handlers which use the generic interrupt framework (<rtems/irq-extension.h>) to get RTEMS_RECORD_INTERRUPT_ENTRY and RTEMS_RECORD_INTERRUPT_EXIT events. This cannot be done by the linker since the loop to call the handlers is inlined due to performance reasons. I would like to add some sort of a callback mechanism which is invoked in rtems_interrupt_handler_install() and rtems_interrupt_handler_remove() operations (similar to the user extensions). There are some options to do this.
> 
> 1. A new linker set with functions.
> 
> 2. A new user extension, maybe a generic:
> 
>   void (*event)(rtems_extension_event event, void *arg);
> 
> 3. An API to install/remove a specific callback for this purpose.
> 

 4. Update or add a new API call to return the currently installed
    handler. This way interrupts can be chained.

> I am in favour of 1. I also would like to hide it from the user for now.

Does 1. allow runtime installing and then tracing of an interrupt? I know 3. would.

Chris