From 49a8b8f05cc85693a05dede399f4dfa5a829b718 Mon Sep 17 00:00:00 2001
From: Jeff Johnston <jjohnstn@redhat.com>
Date: Tue, 5 Oct 2004 20:00:53 +0000
Subject: 2004-10-05  Tomer Levi  <Tomer.Levi@nsc.com>

        * configure.in: Support crx-*-*.
        * configure: regenerate.
        * crx/_exit.c: New file.
        * crx/_getenv.c: Ditto.
        * crx/_rename: Ditto.
        * crx/close.c: Ditto.
        * crx/configure.in: Ditto.
        * crx/crti.S: Ditto.
        * crx/crtn.S: Ditto.
        * crx/crt0.S: Ditto.
        * crx/dvz_hndl.c: Ditto.
        * crx/flg_hndl.c: Ditto.
        * crx/fstat.c: Ditto.
        * crx/getpid.c: Ditto.
        * crx/iad_hndl.c: Ditto.
        * crx/intable.c: Ditto.
        * crx/isatty.c: Ditto.
        * crx/kill.c: Ditto.
        * crx/lseek.c: Ditto.
        * crx/Makefile.in: Ditto.
        * crx/open.c: Ditto.
        * crx/putnum.c: Ditto.
        * crx/read.c: Ditto.
        * crx/sbrk.c: Ditto.
        * crx/sim.ld: Ditto.
        * crx/stat.c: Ditto.
        * crx/svc_hndl.c: Ditto.
        * crx/time.c: Ditto.
        * crx/und_hndl.c: Ditto.
        * crx/unlink.c: Ditto.
        * crx/write.c: Ditto.
---
 libgloss/crx/sbrk.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 libgloss/crx/sbrk.c

(limited to 'libgloss/crx/sbrk.c')

diff --git a/libgloss/crx/sbrk.c b/libgloss/crx/sbrk.c
new file mode 100644
index 000000000..70d5d4f7d
--- /dev/null
+++ b/libgloss/crx/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;
+}
-- 
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