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In summary, when your program is ready to debug, you must follow these steps.
getDebugChar,putDebugChar,flush_i_cache,memset,exceptionHandler.
set_debug_traps();
breakpoint();
exceptionHook. Normally you just use:
void (*exceptionHook)() = 0;
but if before calling set_debug_traps, you set it to point to a
function in your program, that function is called when
gdb continues after stopping on a trap (for example, bus
error). The function indicated by exceptionHook is called with
one parameter: an int which is the exception number.