1 files changed, 41 insertions, 0 deletions
diff --git a/newlib/libc/sys/mmixware/sbrk.c b/newlib/libc/sys/mmixware/sbrk.c
new file mode 100644
index 000000000..5d256127a
--- /dev/null
+++ b/newlib/libc/sys/mmixware/sbrk.c
@@ -0,0 +1,41 @@
+/* sbrk for MMIXware.
+
+   Copyright (C) 2001 Hans-Peter Nilsson.
+
+   Permission to use, copy, modify, and distribute this software is freely
+   granted, provided that this notice is preserved with no changes.
+   THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+   IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+   PURPOSE.  */
+
+#include <_ansi.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include "sys/syscall.h"
+
+extern char *_Sbrk_high;
+
+/* When the program is loaded, the first location in Pool_Segment holds
+   the first available octabyte in the memory pool (a.k.a. the heap);
+   somewhere after the command-line parameters.  We don't have to
+   initialize that location, we can just use it straight up as a pointer;
+   just point the symbol there.
+
+   This file will be compiled with -no-builtin-syms, so we need to define
+   Pool_Segment and any other symbols that would be predefined in mmixal.  */
+
+__asm__ (" .global _Sbrk_high\n"
+       "_Sbrk_high    IS      Pool_Segment\n"
+       "Pool_Segment  IS      0x40<<56");
+
+caddr_t
+_sbrk (size_t incr)
+{
+  extern char end;            /* Defined by the linker */
+  char *prev_heap_end;
+
+  prev_heap_end = _Sbrk_high;
+  _Sbrk_high += incr;
+  return (caddr_t) prev_heap_end;
+}