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The symbol __rt_entry is the starting
point for a program using the ARM C library. Control passes to __rt_entry after
all scatter-loaded regions have been relocated to their execution addresses.
The default implementation of __rt_entry:
Sets up the heap and stack.
Initializes the C library by calling
__rt_lib_init.Calls
main().Shuts down the C library, by calling
__rt_lib_shutdown.Exits.
__rt_entry must end with a call to
one of the following functions:
exit()Calls
atexit()-registered functions and shuts down the library.__rt_exit()Shuts down the library but does not call
atexit()functions._sys_exit()Exits directly to the execution environment. It does not shut down the library and does not call
atexit()functions.