C++ (Cpp) _get_stack_pointer Examples

Example #1

File: rpi-syscall.c Project: sokoide/rpi-baremetal

caddr_t _sbrk(int incr) {
  prev_heap_end = heap_end;
  if ((heap_end + incr) > (unsigned char *)_get_stack_pointer())
    return (caddr_t)-1;
  heap_end += incr;
  return (caddr_t)prev_heap_end;
}

Example #2

File: main_imx233.c Project: Kokoro666/Evangelion-Kernel

void main()
{
  //enable_mmu();
  //arm_invalidate_data_caches();

  //uart_init(); // gpio setup also affects emmc TODO: document

  uart_puts("-- EVANGELION/IMX233 kernel_main entered.\r\n");
  setbuf(stdout, NULL);

  //libfs_init();

  //init_rpi_qpu();
  //uart_puts("-- QPU enabled.\r\n");

  FB = (COLOR_TYPE*)0x40000000;
  FB_MEM = FB;

  //init_blitter(FB);

  sprintf(buf, "-- framebuffer at %p.\r\n",FB);
  uart_puts(buf);

  sprintf(buf, "-- heap starts at %p.\r\n", heap_end);
  uart_puts(buf);

  sprintf(buf, "-- stack pointer at %p.\r\n", _get_stack_pointer());
  uart_puts(buf);

  memset(FB, 0x88, SCREEN_W*SCREEN_H*SCREEN_BPP);

  //eth_rx_buffer=malloc(64*1024);

  uart_repl();
}

Example #3

File: armc-009-cstubs.c Project: AndresBrie/arm-tutorial-rpi

/* Increase program data space. As malloc and related functions depend on this,
   it is useful to have a working implementation. The following suffices for a
   standalone system; it exploits the symbol _end automatically defined by the
   GNU linker. */
caddr_t _sbrk( int incr )
{
    extern char _end;
    static char* heap_end;
    char* prev_heap_end;

    if( heap_end == 0 )
        heap_end = &_end;

     prev_heap_end = heap_end;

     if( ( heap_end + incr) > _get_stack_pointer() )
     {
        while(1)
        {
            /* TRAP HERE! */
        }
     }

     heap_end += incr;
     return (caddr_t)prev_heap_end;
}