SVC: Difference between revisions

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