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@c
@c COPYRIGHT (c) 1988-1998.
@c On-Line Applications Research Corporation (OAR).
@c All rights reserved.
@c
@c $Id$
@c
@ifinfo
@node Default Fatal Error Processing, Default Fatal Error Processing Introduction, Interrupt Processing Interrupt Stack, Top
@end ifinfo
@chapter Default Fatal Error Processing
@ifinfo
@menu
* Default Fatal Error Processing Introduction::
* Default Fatal Error Processing Default Fatal Error Handler Operations::
@end menu
@end ifinfo
@ifinfo
@node Default Fatal Error Processing Introduction, Default Fatal Error Processing Default Fatal Error Handler Operations, Default Fatal Error Processing, Default Fatal Error Processing
@end ifinfo
@section Introduction
Upon detection of a fatal error by either the
application or RTEMS the fatal error manager is invoked. The
fatal error manager will invoke the user-supplied fatal error
handlers. If no user-supplied handlers are configured, the
RTEMS provided default fatal error handler is invoked. If the
user-supplied fatal error handlers return to the executive the
default fatal error handler is then invoked. This chapter
describes the precise operations of the default fatal error
handler.
@ifinfo
@node Default Fatal Error Processing Default Fatal Error Handler Operations, Board Support Packages, Default Fatal Error Processing Introduction, Default Fatal Error Processing
@end ifinfo
@section Default Fatal Error Handler Operations
The default fatal error handler which is invoked by
the @code{rtems_fatal_error_occurred} directive when there is no user handler
configured or the user handler returns control to RTEMS. The
default fatal error handler performs the following actions:
@itemize @bullet
@item places the error code in r3, and
@item executes a trap instruction which results in a Program Exception.
@end itemize
If the Program Exception returns, then the following actions are performed:
@itemize @bullet
@item disables all processor exceptions by loading a 0 into the MSR, and
@item goes into an infinite loop to simulate a halt processor instruction.
@end itemize
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