Subversion Repositories or1k

@c

@c  COPYRIGHT (c) 1988-2002.

@c  On-Line Applications Research Corporation (OAR).

@c  All rights reserved.

@c

@c  fatalerr.t,v 1.7 2002/01/17 21:47:46 joel Exp

@c

@chapter Default Fatal Error Processing

@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.

@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