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260 bytes added ,  14:11, 26 September 2017
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=Exception Handling=
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= Exception handling =
There appears to be userland code for handling exceptions, however this doesn't seem to be executed on retail.
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There is userland code for handling exceptions, however this doesn't seem to be executed on retail mode.
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On usermode exception, it jumps to main code binary entrypoint (main_binary_address+0) with X0=exception_info_ptr and X1=exception_info2_ptr.
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When a usermode exception occurs, it jumps to the main code binary entrypoint (main_binary_address + 0 == '''_start''').
On boot, X0 is set to 0 triggering normal crt0 setup.
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During normal boot '''_start''' is invoked with X0=0 and X1=main_thread_handle (triggering normal crt0 setup).
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During an usermode exception '''_start''' is invoked with X0=exception_info0_ptr and X1=exception_info1_ptr instead.
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The '''_start''' method determines whether to boot normally or handle an exception if X0 is set to 0 or not.

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