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