84 lines
2.8 KiB
C
84 lines
2.8 KiB
C
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/**
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*****************************************************************************
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**
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** File : sysmem.c
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**
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** Author : Auto-generated by STM32CubeIDE
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**
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** Abstract : STM32CubeIDE Minimal System Memory calls file
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**
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** For more information about which c-functions
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** need which of these lowlevel functions
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** please consult the Newlib libc-manual
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**
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** Environment : STM32CubeIDE MCU
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**
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** Distribution: The file is distributed as is, without any warranty
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** of any kind.
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**
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*****************************************************************************
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**
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** <h2><center>© COPYRIGHT(c) 2018 STMicroelectronics</center></h2>
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**
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** Redistribution and use in source and binary forms, with or without modification,
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** are permitted provided that the following conditions are met:
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** 1. Redistributions of source code must retain the above copyright notice,
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** this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright notice,
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** this list of conditions and the following disclaimer in the documentation
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** and/or other materials provided with the distribution.
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** 3. Neither the name of STMicroelectronics nor the names of its contributors
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** may be used to endorse or promote products derived from this software
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** without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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** AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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** DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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** OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**
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**
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*****************************************************************************
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*/
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/* Includes */
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#include <errno.h>
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#include <stdio.h>
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/* Variables */
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extern int errno;
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register char * stack_ptr asm("sp");
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/* Functions */
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/**
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_sbrk
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Increase program data space. Malloc and related functions depend on this
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**/
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caddr_t _sbrk(int incr)
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{
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extern char end asm("end");
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static char *heap_end;
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char *prev_heap_end;
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if (heap_end == 0)
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heap_end = &end;
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prev_heap_end = heap_end;
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if (heap_end + incr > stack_ptr)
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{
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errno = ENOMEM;
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return (caddr_t) -1;
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}
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heap_end += incr;
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return (caddr_t) prev_heap_end;
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}
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