extern value_in_regs struct __argc_argv __rt_lib_init(unsigned heapbase, unsigned heaptop);

where:

This function is called immediately after __rt_stackheap_init() and is passed an initial chunk of memory to use as a heap. This function is the standard ARM C library initialization function and it must not be reimplemented.

This function returns argc and argv ready to be passed to main(). The structure is returned in the registers as:

struct __argc_argv
{   int argc;
    char **argv;
    int r2, r3;   // optional extra arguments that on entry to main() are
};                // found in registers R2 and R3.