20000317 sourceware import

libgloss/m32r/sbrk.c

@@ -0,0 +1,34 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include "syscall.h"
+#include "eit.h"
+
+caddr_t
+_sbrk (int incr)
+{
+  /* `_end' is defined in the linker script.
+     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
+     addressability.  */
+  extern char _end __attribute__ ((__model__(__medium__)));
+  static char *heap_end;
+  char *prev_heap_end;
+  char *sp = (char *)&sp;
+
+  if (heap_end == 0)
+    {
+      heap_end = &_end;
+    }
+  prev_heap_end = heap_end;
+  if (heap_end > sp)
+    {
+      _write (1, "Heap and stack collision\n", 25);
+#if 0 /* Calling abort brings in the signal handling code.  */
+      abort ();
+#else
+      exit (1);
+#endif
+    }
+  heap_end += incr;
+  return (caddr_t) prev_heap_end;
+}