libgloss/mn10300/sbrk.c

   1 #include <_ansi.h>
   2 #include <sys/types.h>
   3 #include <sys/stat.h>
   4 #include <stdlib.h>
   5 #include "trap.h"
   6
   7 extern int _write (int, char *, size_t);
   8
   9
  10 caddr_t
  11 _sbrk (size_t incr)
  12 {
  13   extern char end;              /* Defined by the linker */
  14   static char *heap_end;
  15   char *prev_heap_end;
  16 #if 0
  17   char *sp = (char *)stack_ptr;
  18 #else
  19   char *sp = (char *)&sp;
  20 #endif
  21
  22   if (heap_end == 0)
  23     {
  24       heap_end = &end;
  25     }
  26   prev_heap_end = heap_end;
  27   heap_end += incr;
  28   if (heap_end > sp)
  29     {
  30       _write (1, "Heap and stack collision\n", 25);
  31       abort ();
  32     }
  33   return (caddr_t) prev_heap_end;
  34 }