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+>Default Synchronous Exception Handling</TITLE
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+>Chapter 10. Exception Handling</TD
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+><H1
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+><A
+NAME="HAL-DEFAULT-SYNCHRONOUS-EXCEPTION-HANDLING">Default Synchronous Exception Handling</H1
+><P
+>Most synchronous exception VSR table entries will point to a default
+exception VSR which is responsible for handling all exceptions in a
+generic manner. The default VSR simply saves the CPU state, makes any
+adjustments to the CPU state that is necessary, and calls
+<TT
+CLASS="FUNCTION"
+>cyg_hal_exception_handler()</TT
+>.</P
+><P
+><TT
+CLASS="FUNCTION"
+>cyg_hal_exception_handler()</TT
+> needs to pass the
+exception on to some handling code. There are two basic destinations:
+enter GDB or pass the exception up to eCos. Exactly which
+destination is taken depends on the configuration. When the GDB stubs are
+included then the exception is passed to them, otherwise it is passed
+to eCos.</P
+><P
+>If an eCos application has been loaded by RedBoot then the VSR table
+entries will all point into RedBoot's exception VSR, and will
+therefore enter GDB if an exception occurs. If the eCos application
+wants to handle an exception itself, it needs to replace the the VSR
+table entry with one pointing to its own VSR. It can do this with the
+<TT
+CLASS="FUNCTION"
+>HAL_VSR_SET_TO_ECOS_HANDLER()</TT
+> macro.</P
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