2010-12-02 Jayant Sonar jayant.sonar@kpitcummins.com

            Kaushik Phatak  kaushik.phatak@kpitcummins.com

        * configure.in: Add CR16 support.
        * configure: Regenerated.
        * cr16/aclocal.m4: New.
        * cr16/close.c: New.
        * cr16/configure: New.
        * cr16/configure.in: New.
        * cr16/crt1.S: New.
        * cr16/crti.S: New.
        * cr16/crtn.S: New.
        * cr16/dvz_hndl.c: New.
        * cr16/_exit.c: New.
        * cr16/flg_hndl.c: New.
        * cr16/fstat.c: New.
        * cr16/_getenv.c: New.
        * cr16/getpid.c: New.
        * cr16/iad_hndl.c: New.
        * cr16/intable.c: New.
        * cr16/isatty.c: New.
        * cr16/kill.c: New.
        * cr16/lseek.c: New.
        * cr16/Makefile.in: New.
        * cr16/open.c: New.
        * cr16/putnum.c: New.
        * cr16/read.c: New.
        * cr16/_rename.c: New.
        * cr16/sbrk.c: New.
        * cr16/sim.ld: New.
        * cr16/stat.c: New.
        * cr16/svc_hndl.c: New.
        * cr16/time.c: New.
        * cr16/und_hndl.c: New.
        * cr16/unlink.c: New.
        * cr16/write.c: New.

1 files changed, 56 insertions, 0 deletions

diff --git a/libgloss/cr16/sbrk.c b/libgloss/cr16/sbrk.c
new file mode 100644
index 000000000..7c9604726
--- /dev/null
+++ b/libgloss/cr16/sbrk.c
@@ -0,0 +1,56 @@
+/* sbrk.c -- Implementation of the low-level sbrk() routine
+ *
+ * Copyright (c) 2004 National Semiconductor Corporation
+ *
+ * The authors hereby grant permission to use, copy, modify, distribute,
+ * and license this software and its documentation for any purpose, provided
+ * that existing copyright notices are retained in all copies and that this
+ * notice is included verbatim in any distributions. No written agreement,
+ * license, or royalty fee is required for any of the authorized uses.
+ * Modifications to this software may be copyrighted by their authors
+ * and need not follow the licensing terms described here, provided that
+ * the new terms are clearly indicated on the first page of each file where
+ * they apply.
+ */
+
+#include <errno.h>
+#include <stddef.h> /* where ptrdiff_t is defined */
+#include <stdlib.h>
+
+/* Extend heap space by size bytes.
+   Return start of new space allocated, or -1 for errors 
+   Error cases:
+    1. Allocation is not within heap range */
+
+void * _sbrk (ptrdiff_t size)
+{
+  /*
+  * The following two memory locations should be defined in the linker script file
+  */
+  extern const char _HEAP_START; /* start of heap */
+  extern const char _HEAP_MAX;	 /* end of heap (maximum value of heap_ptr) */
+
+  static const char * heap_ptr;  /* pointer to head of heap */
+  const char * old_heap_ptr;
+  static unsigned char init_sbrk = 0;
+
+  /* heap_ptr is initialized to HEAP_START */
+  if (init_sbrk == 0) 
+  {
+    heap_ptr = &_HEAP_START;
+    init_sbrk = 1;
+  }
+
+  old_heap_ptr = heap_ptr;
+
+  if ((heap_ptr + size) > &_HEAP_MAX)
+  { 
+    /* top of heap is bigger than _HEAP_MAX */
+    errno = ENOMEM;
+    return (void *) -1;
+  }
+
+  /* success: update heap_ptr and return previous value */
+  heap_ptr += size;
+  return (void *)old_heap_ptr;
+}