[RTEMS Project] #3762: Return the current handler from ARM cp15 set exception call

[RTEMS trac]

#3762: Return the current handler from ARM cp15 set exception call
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  Reporter:  Chris Johns  |      Owner:  Chris Johns
      Type:  enhancement  |     Status:  assigned
  Priority:  normal       |  Milestone:  5.1
 Component:  arch/arm     |    Version:  5
  Severity:  normal       |   Keywords:
Blocked By:               |   Blocking:
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 Update the cp15 call `arm_cp15_set_exception_handler()` to return the
 current handler. This lets code catch and return an exception handler, for
 example code to probe suspect hardware.

 This is need to probe the memory map debug registers for debug v7
 implementations.

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Ticket URL: <http://devel.rtems.org/ticket/3762>
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