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In general, the branch instruction will branch to the start of the C-environment initialization routine located in the C-compiler runtime support library. The entry symbol for this routine is _c_int00.
The C-environment initialization function in the C compiler runtime support library, _c_int00, performs the initialization of global and static variables. This involves a data copy from the .cinit section (located in on-chip flash memory) to the .ebss section (located in RAM) for each initialized global variable.
