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#include <sys/types.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <sys/stat.h>

#include "syscall.h"

#include "syscall.h"

#include "eit.h"

#include "eit.h"

caddr_t

caddr_t

_sbrk (int incr)

_sbrk (int incr)

{

{

  /* `_end' is defined in the linker script.

  /* `_end' is defined in the linker script.

     We must handle it carefully as we don't want the compiler to think

     We must handle it carefully as we don't want the compiler to think

     it lives in the small data area.  Use medium model to ensure 32 bit

     it lives in the small data area.  Use medium model to ensure 32 bit

     addressability.  */

     addressability.  */

  extern char _end __attribute__ ((__model__(__medium__)));

  extern char _end __attribute__ ((__model__(__medium__)));

  static char *heap_end;

  static char *heap_end;

  char *prev_heap_end;

  char *prev_heap_end;

  char *sp = (char *)&sp;

  char *sp = (char *)&sp;

  if (heap_end == 0)

  if (heap_end == 0)

    {

    {

      heap_end = &_end;

      heap_end = &_end;

    }

    }

  prev_heap_end = heap_end;

  prev_heap_end = heap_end;

  if (heap_end > sp)

  if (heap_end > sp)

    {

    {

      _write (1, "Heap and stack collision\n", 25);

      _write (1, "Heap and stack collision\n", 25);

#if 0 /* Calling abort brings in the signal handling code.  */

#if 0 /* Calling abort brings in the signal handling code.  */

      abort ();

      abort ();

#else

#else

      exit (1);

      exit (1);

#endif

#endif

    }

    }

  heap_end += incr;

  heap_end += incr;

  return (caddr_t) prev_heap_end;

  return (caddr_t) prev_heap_end;

}

}