| 1 | /* sbrk.c for the Visium processor. |
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| 2 | |
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| 3 | Copyright (c) 2015 Rolls-Royce Controls and Data Services Limited. |
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| 4 | All rights reserved. |
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| 5 | |
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| 6 | Redistribution and use in source and binary forms, with or without |
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| 7 | modification, are permitted provided that the following conditions are met: |
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| 8 | |
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| 9 | * Redistributions of source code must retain the above copyright notice, |
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| 10 | this list of conditions and the following disclaimer. |
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| 11 | * Redistributions in binary form must reproduce the above copyright |
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| 12 | notice, this list of conditions and the following disclaimer in the |
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| 13 | documentation and/or other materials provided with the distribution. |
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| 14 | * Neither the name of Rolls-Royce Controls and Data Services Limited nor |
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| 15 | the names of its contributors may be used to endorse or promote products |
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| 16 | derived from this software without specific prior written permission. |
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| 17 | |
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| 18 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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| 19 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 20 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 21 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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| 22 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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| 23 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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| 24 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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| 25 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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| 26 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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| 27 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
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| 28 | THE POSSIBILITY OF SUCH DAMAGE. */ |
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| 29 | |
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| 30 | #include <unistd.h> |
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| 31 | #include <errno.h> |
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| 32 | #include <string.h> |
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| 33 | |
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| 34 | /* These labels are set in the linker script, to mark the start and end of the |
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| 35 | memory reserved for the heap. */ |
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| 36 | extern unsigned char _sheap []; |
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| 37 | extern unsigned char _eheap []; |
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| 38 | |
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| 39 | void * |
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| 40 | sbrk (ptrdiff_t nbytes) |
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| 41 | { |
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| 42 | static unsigned char *heap_ptr = _sheap; |
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| 43 | |
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| 44 | if (0 <= nbytes && heap_ptr + nbytes < _eheap) |
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| 45 | { |
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| 46 | void *base = (void *)heap_ptr; |
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| 47 | |
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| 48 | heap_ptr += nbytes; |
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| 49 | memset (base, 0, nbytes); |
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| 50 | |
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| 51 | return base; |
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| 52 | } |
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| 53 | |
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| 54 | errno = ENOMEM; |
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| 55 | return (void *)-1; |
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| 56 | } |
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