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#include <stdint.h>
#include <cortex_m/fpu.h>
int main();
typedef void (*funcp_t)();
// Symbols from linker script.
extern uint32_t _data_rom;
extern uint32_t _data_start;
extern uint32_t _data_end;
extern uint32_t _bss_start;
extern uint32_t _bss_end;
extern funcp_t _init_array_start;
extern funcp_t _init_array_end;
extern funcp_t _fini_array_start;
extern funcp_t _fini_array_end;
void __attribute__((naked)) entry() {
// Load .data from rom image.
uint32_t* rp = &_data_rom;
uint32_t* wp = &_data_start;
while(wp < &_data_end) {
*wp++ = *rp++;
}
// Clear .bss.
wp = &_bss_start;
while(wp < &_bss_end) {
*wp++ = 0;
}
// Enable FPU before calling any functions that can invoke FPU instructions.
#ifdef HAS_FPU
COPROC.CPAC |= (3 << 22) | (3 << 20);
#endif
// Call constructors.
funcp_t* fp = &_init_array_start;
while(fp < &_init_array_end) {
(*fp++)();
}
// Call main().
main();
// Call destructors.
fp = &_fini_array_start;
while(fp < &_fini_array_end) {
(*fp++)();
}
// Halt.
while(1);
}
extern "C" void __cxa_pure_virtual() {
while (1);
}
void* __dso_handle = 0;
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