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