typedef void (*ptr_func_t)();

struct smd_header {
    char console_name[16];
    char copyright[16];
    char domestic_name[48];
    char international_name[48];
    char version[14];
    unsigned short checksum;
    char io_support[16];
    unsigned long rom_start;
    unsigned long rom_end;
    unsigned long ram_start;
    unsigned long ram_end;
    unsigned long sram_enabled;
    unsigned long unused1;
    unsigned long sram_start;
    unsigned long sram_end;
    unsigned long unused2;
    unsigned long unused3;
    char notes[40];
    char country_codes[16];
};

void INT_Null(void) __attribute__((weak, interrupt));
void CPU_EntryPoint(void) __attribute__((weak, alias ("INT_Null")));
void INT_HInterrupt(void) __attribute__((weak, alias ("INT_Null")));
void INT_VInterrupt(void) __attribute__((weak, alias ("INT_Null")));
void CPU_Exception(void) __attribute__((weak, interrupt));

extern unsigned __stacktop;
extern unsigned __rom_start;
extern unsigned __rom_end;

__attribute__((section(".stack"), used)) unsigned *__stack_init = &__stacktop;

__attribute__((section(".vectors"), used)) ptr_func_t __isr_vectors[] = {
    CPU_EntryPoint,
    CPU_Exception,
    CPU_Exception,
    CPU_Exception,
    CPU_Exception,
    CPU_Exception,
    CPU_Exception,
    CPU_Exception,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_HInterrupt,
    INT_Null,
    INT_VInterrupt,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
    INT_Null,
};

__attribute__((section(".smd_header"), used)) struct smd_header __smd_header = {
    .console_name = "SEGA MEGA DRIVE ",
    .copyright = "BIGEVILCORP.    ",
    .domestic_name = "HELLO WORLD                                     ",
    .international_name = "HELLO WORLD                                     ",
    .version = "GM XXXXXXXX-XX",
    .checksum = 0x0000,
    .io_support = "J               ",
    .rom_start = (unsigned long)&__rom_start,
    .rom_end = (unsigned long)&__rom_end-1,
    .ram_start = 0xff0000,
    .ram_end = 0xffffff,
    .sram_enabled = 0x00000000,
    .unused1 = 0x00000000,
    .sram_start = 0x00000000,
    .sram_end = 0x00000000,
    .unused2 = 0x00000000,
    .unused3 = 0x00000000,
    .notes = "                                        ",
    .country_codes = "  E             ",
};

void INT_Null(void) {}

void CPU_Exception(void)
{
     asm inline volatile ("  stop #2700");
}