__rt_entry

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.

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The default implementation of __rt_entry:

  1. Sets up the heap and stack.

  2. Initializes the C library by calling __rt_lib_init.

  3. Calls main().

  4. Shuts down the C library, by calling __rt_lib_shutdown.

  5. 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.

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