1 /******************************************************************************
3 * Copyright (C) 2014 Xilinx, Inc. All rights reserved.
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to deal
7 * in the Software without restriction, including without limitation the rights
8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 * copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
15 * Use of the Software is limited solely to applications:
16 * (a) running on a Xilinx device, or
17 * (b) that interact with a Xilinx device through a bus or interconnect.
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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27 * Except as contained in this notice, the name of the Xilinx shall not be used
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29 * this Software without prior written authorization from Xilinx.
31 ******************************************************************************/
33 #include <sys/types.h>
34 #include "xil_types.h"
36 extern u8 _heap_start[];
37 extern u8 _heap_end[];
41 __attribute__((weak)) caddr_t _sbrk ( s32 incr );
45 __attribute__((weak)) caddr_t _sbrk ( s32 incr )
47 static u8 *heap = NULL;
49 static u8 *HeapEndPtr = (u8 *)&_heap_end;
53 heap = (u8 *)&_heap_start;
59 if (heap > HeapEndPtr){
60 Status = (caddr_t) -1;
62 else if (prev_heap != NULL) {
63 Status = (caddr_t) ((void *)prev_heap);
66 Status = (caddr_t) -1;