_sbrk for Hitachi H8/300 and H8/300H

[Giovanni Caterina]

Hello,

First of all, I'm not one of your customers.
I use the gcc cross compiler with your newlib 1.8.1.
May I suggest you the following correction to your module sbrk.c for 
the Hitachi H8/300(H) :

---------------------------------------------------------------------
#include <_ansi.h>
#include <sys/types.h>
#include <sys/stat.h>

register char *stack_ptr asm ("sp");

caddr_t 
  _sbrk(incr)
     int incr;
{
  extern char end;		/* Defined by the linker */
  static char *heap_end;
  char *prev_heap_end;

  if (heap_end == 0) 
    {
      heap_end = &end;
    }
  /* Correction */
  if((short)heap_end & 1) ++heap_end;
    /*
       This ensures that the allocated space always begins
       at an even address. We need this because it can contain
       any type of data and the processor can access words
       (and long words for 300H) ONLY ON EVEN addresses and since
       we can allocate an odd number of bytes ... !!!
    */
  /* end of correction */
  prev_heap_end = heap_end;
  if (heap_end + incr > stack_ptr)
    {
      _write (1, "Heap and stack collision\n", 25);
      abort ();
    }
  heap_end += incr;
  return (caddr_t)prev_heap_end;
}
---------------------------------------------------------------------

Best regards,



Giovanni Caterina
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