1 /***********************************************************************************************************************
2 * Copyright [2020-2022] Renesas Electronics Corporation and/or its affiliates. All Rights Reserved.
3 *
4 * This software and documentation are supplied by Renesas Electronics America Inc. and may only be used with products
5 * of Renesas Electronics Corp. and its affiliates ("Renesas"). No other uses are authorized. Renesas products are
6 * sold pursuant to Renesas terms and conditions of sale. Purchasers are solely responsible for the selection and use
7 * of Renesas products and Renesas assumes no liability. No license, express or implied, to any intellectual property
8 * right is granted by Renesas. This software is protected under all applicable laws, including copyright laws. Renesas
9 * reserves the right to change or discontinue this software and/or this documentation. THE SOFTWARE AND DOCUMENTATION
10 * IS DELIVERED TO YOU "AS IS," AND RENESAS MAKES NO REPRESENTATIONS OR WARRANTIES, AND TO THE FULLEST EXTENT
11 * PERMISSIBLE UNDER APPLICABLE LAW, DISCLAIMS ALL WARRANTIES, WHETHER EXPLICITLY OR IMPLICITLY, INCLUDING WARRANTIES
12 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NONINFRINGEMENT, WITH RESPECT TO THE SOFTWARE OR
13 * DOCUMENTATION. RENESAS SHALL HAVE NO LIABILITY ARISING OUT OF ANY SECURITY VULNERABILITY OR BREACH. TO THE MAXIMUM
14 * EXTENT PERMITTED BY LAW, IN NO EVENT WILL RENESAS BE LIABLE TO YOU IN CONNECTION WITH THE SOFTWARE OR DOCUMENTATION
15 * (OR ANY PERSON OR ENTITY CLAIMING RIGHTS DERIVED FROM YOU) FOR ANY LOSS, DAMAGES, OR CLAIMS WHATSOEVER, INCLUDING,
16 * WITHOUT LIMITATION, ANY DIRECT, CONSEQUENTIAL, SPECIAL, INDIRECT, PUNITIVE, OR INCIDENTAL DAMAGES; ANY LOST PROFITS,
17 * OTHER ECONOMIC DAMAGE, PROPERTY DAMAGE, OR PERSONAL INJURY; AND EVEN IF RENESAS HAS BEEN ADVISED OF THE POSSIBILITY
18 * OF SUCH LOSS, DAMAGES, CLAIMS OR COSTS.
19 **********************************************************************************************************************/
20
21 /***********************************************************************************************************************
22 * Includes <System Includes> , "Project Includes"
23 **********************************************************************************************************************/
24 #if defined(__GNUC__) && !defined(__ARMCC_VERSION)
25 #include "bsp_api.h"
26 #include <sys/types.h>
27 #include <errno.h>
28
29 /***********************************************************************************************************************
30 * Macro definitions
31 **********************************************************************************************************************/
32
33 /***********************************************************************************************************************
34 * Typedef definitions
35 **********************************************************************************************************************/
36
37 /***********************************************************************************************************************
38 * Private function prototypes
39 **********************************************************************************************************************/
40
41 /***********************************************************************************************************************
42 * Exported global variables (to be accessed by other files)
43 **********************************************************************************************************************/
44
45 caddr_t _sbrk(int incr);
46
47 /***********************************************************************************************************************
48 * Private global variables and functions
49 **********************************************************************************************************************/
50
51 /*******************************************************************************************************************//**
52 * @addtogroup BSP_MCU
53 * @{
54 **********************************************************************************************************************/
55
56 /*******************************************************************************************************************//**
57 * FSP implementation of the standard library _sbrk() function.
58 * @param[in] inc The number of bytes being asked for by malloc().
59 *
60 * @note This function overrides the _sbrk version that exists in the newlib library that is linked with.
61 * That version improperly relies on the SP as part of it's allocation strategy. This is bad in general and
62 * worse in an RTOS environment. This version insures that we allocate the byte pool requested by malloc()
63 * only from our allocated HEAP area. Also note that newlib is pre-built and forces the pagesize used by
64 * malloc() to be 4096. That requires that we have a HEAP of at least 4096 if we are to support malloc().
65 * @retval Address of allocated area if successful, -1 otherwise.
66 **********************************************************************************************************************/
67
_sbrk(int incr)68 caddr_t _sbrk (int incr)
69 {
70 extern char _Heap_Begin __asm("__HeapBase"); ///< Defined by the linker.
71
72 extern char _Heap_Limit __asm("__HeapLimit"); ///< Defined by the linker.
73
74 uint32_t bytes = (uint32_t) incr;
75 static char * current_heap_end = 0;
76 char * current_block_address;
77
78 if (current_heap_end == 0)
79 {
80 current_heap_end = &_Heap_Begin;
81 }
82
83 current_block_address = current_heap_end;
84
85 /* The returned address must be aligned to a word boundary to prevent hard faults on cores that do not support
86 * unaligned access. We assume the heap starts on a word boundary and make sure all allocations are a multiple
87 * of 4. */
88 bytes = (bytes + 3U) & (~3U);
89 if (current_heap_end + bytes > &_Heap_Limit)
90 {
91 /** Heap has overflowed */
92 errno = ENOMEM;
93
94 return (caddr_t) -1;
95 }
96
97 current_heap_end += bytes;
98
99 return (caddr_t) current_block_address;
100 }
101
102 #endif
103
104 /******************************************************************************************************************//**
105 * @} (end addtogroup BSP_MCU)
106 *********************************************************************************************************************/
107