/*****************************************************************
 * Program starts here.
 *   overwriting this label in the user program
 *   causes removing all startup code except __do_global_ctors
 *****************************************************************/
        .section .init0, "ax", @progbits
        .weak   _reset_vector__
        .func   _reset_vector__

        .p2align 1,0
_reset_vector__:

;    stack can be initialized in main() prologue,
;    but setting stack pointer here allows to call subroutines 
;    from startup code and call constructors of statically allocated C++ objects.
;    Stack pointer will have the same value entering main() as here,
;    so -mno-stack-init can be used to reduce code size.
;    initial stack value can be set in ld script as __stack symbol 
;    (end of RAM by default), or via -defsym __stack=<address> ld option
;    or via -Wl,defsym,__stack=<address> gcc option, or by redefining
;    __init_stack function as fololws:
;
;#if defined (__cplusplus)
;extern "C" 
;#endif
;__attribute__((__naked__)) __attribute__((section(".init2"))) void __init_stack()
;{
;    asm volatile("\tmov\t#stack_addr, r1\n");
;}
;
        /* request following functions to be linked if library _reset_vector__ used */

        .global	__init_stack

        .global	__low_level_init
        .global	__do_copy_data
        .global	__do_clear_bss
        .global	__jump_to_main

        .endfunc