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| 1 | /* |
1 | /* |
| 2 | * Copyright (C) 2006 Jakub Jermar |
2 | * Copyright (C) 2006 Jakub Jermar |
| 3 | * All rights reserved. |
3 | * All rights reserved. |
| 4 | * |
4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
7 | * are met: |
| 8 | * |
8 | * |
| 9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
| 14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
| 15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
| 16 | * |
16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
27 | */ |
| 28 | 28 | ||
| 29 | #include <libc.h> |
29 | #include <libc.h> |
| 30 | #include <unistd.h> |
30 | #include <unistd.h> |
| 31 | 31 | ||
| 32 | /** Mremap syscall */ |
32 | /** Mremap syscall */ |
| 33 | void *mremap(void *address, size_t size, unsigned long flags) |
33 | void *mremap(void *address, size_t size, unsigned long flags) |
| 34 | { |
34 | { |
| 35 | return (void *) __SYSCALL3(SYS_MREMAP, (sysarg_t ) address, (sysarg_t) size, (sysarg_t) flags); |
35 | return (void *) __SYSCALL3(SYS_MREMAP, (sysarg_t ) address, (sysarg_t) size, (sysarg_t) flags); |
| 36 | } |
36 | } |
| 37 | 37 | ||
| 38 | 38 | ||
| 39 | static size_t heapsize = 0; |
39 | static size_t heapsize = 0; |
| 40 | /* Start of heap linker symbol */ |
40 | /* Start of heap linker symbol */ |
| 41 | extern char _heap; |
41 | extern char _heap; |
| 42 | 42 | ||
| 43 | /** Sbrk emulation |
43 | /** Sbrk emulation |
| 44 | * |
44 | * |
| 45 | * @param size New area that should be allocated or negative, |
45 | * @param size New area that should be allocated or negative, |
| 46 | if it should be shrinked |
46 | if it should be shrinked |
| 47 | * @return Pointer to newly allocated area |
47 | * @return Pointer to newly allocated area |
| 48 | */ |
48 | */ |
| 49 | void *sbrk(ssize_t incr) |
49 | void *sbrk(ssize_t incr) |
| 50 | { |
50 | { |
| 51 | void *res; |
51 | void *res; |
| 52 | /* Check for invalid values */ |
52 | /* Check for invalid values */ |
| 53 | if (incr < 0 && -incr > heapsize) |
53 | if (incr < 0 && -incr > heapsize) |
| 54 | return NULL; |
54 | return NULL; |
| 55 | /* Check for too large value */ |
55 | /* Check for too large value */ |
| 56 | if (incr > 0 && incr+heapsize < heapsize) |
56 | if (incr > 0 && incr+heapsize < heapsize) |
| 57 | return NULL; |
57 | return NULL; |
| 58 | /* Check for too small values */ |
58 | /* Check for too small values */ |
| 59 | if (incr < 0 && incr+heapsize > heapsize) |
59 | if (incr < 0 && incr+heapsize > heapsize) |
| 60 | return NULL; |
60 | return NULL; |
| 61 | 61 | ||
| 62 | res = mremap(&_heap, heapsize + incr,0); |
62 | res = mremap(&_heap, heapsize + incr,0); |
| 63 | if (!res) |
63 | if (!res) |
| 64 | return NULL; |
64 | return NULL; |
| - | 65 | ||
| - | 66 | /* Compute start of new area */ |
|
| 65 | res = (void *)&_heap + incr; |
67 | res = (void *)&_heap + heapsize; |
| - | 68 | ||
| 66 | heapsize += incr; |
69 | heapsize += incr; |
| - | 70 | ||
| 67 | return res; |
71 | return res; |
| 68 | } |
72 | } |
| 69 | 73 | ||