1 files changed, 66 insertions, 0 deletions
diff --git a/utilities/fsl_sbrk.c b/utilities/fsl_sbrk.c
new file mode 100644
index 0000000..aae6b1e
--- /dev/null
+++ b/utilities/fsl_sbrk.c
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2015, Freescale Semiconductor, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * o Redistributions of source code must retain the above copyright notice, this list
+ *   of conditions and the following disclaimer.
+ *
+ * o Redistributions in binary form must reproduce the above copyright notice, this
+ *   list of conditions and the following disclaimer in the documentation and/or
+ *   other materials provided with the distribution.
+ *
+ * o Neither the name of Freescale Semiconductor, Inc. nor the names of its
+ *   contributors may be used to endorse or promote products derived from this
+ *   software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#if defined(__GNUC__)
+#include <stdio.h>
+#include <errno.h>
+#endif
+
+#if defined(__GNUC__)
+/*!
+ * @brief Function to override ARMGCC default function _sbrk
+ *
+ * _sbrk is called by malloc. ARMGCC default _sbrk compares "SP" register and
+ * heap end, if heap end is larger than "SP", then _sbrk returns error and
+ * memory allocation failed. This function changes to compare __HeapLimit with
+ * heap end.
+ */
+caddr_t _sbrk(int incr)
+{
+    extern char end __asm("end");
+    extern char heap_limit __asm("__HeapLimit");
+    static char *heap_end;
+    char *prev_heap_end;
+
+    if (heap_end == NULL)
+        heap_end = &end;
+
+    prev_heap_end = heap_end;
+
+    if (heap_end + incr > &heap_limit)
+    {
+        errno = ENOMEM;
+        return (caddr_t)-1;
+    }
+
+    heap_end += incr;
+
+    return (caddr_t)prev_heap_end;
+}
+#endif