57 lines
2.2 KiB
C
57 lines
2.2 KiB
C
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/* sbrk.c for the Visium processor.
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Copyright (c) 2015 Rolls-Royce Controls and Data Services Limited.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* 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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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of Rolls-Royce Controls and Data Services Limited nor
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the names of its contributors may be used to endorse or promote products
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derived from this software without specific prior written permission.
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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
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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THE POSSIBILITY OF SUCH DAMAGE. */
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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/* These labels are set in the linker script, to mark the start and end of the
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memory reserved for the heap. */
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extern unsigned char _sheap [];
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extern unsigned char _eheap [];
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void *
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sbrk (ptrdiff_t nbytes)
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{
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static unsigned char *heap_ptr = _sheap;
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if (0 <= nbytes && heap_ptr + nbytes < _eheap)
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{
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void *base = (void *)heap_ptr;
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heap_ptr += nbytes;
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memset (base, 0, nbytes);
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return base;
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}
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errno = ENOMEM;
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return (void *)-1;
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}
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