source: trunk/libs/newlib/src/libgloss/arc/sbrk.c @ 444

Last change on this file since 444 was 444, checked in by satin@…, 6 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc

File size: 2.1 KB
Line 
1/*
2   Copyright (c) 2015, Synopsys, Inc. All rights reserved.
3
4   Redistribution and use in source and binary forms, with or without
5   modification, are permitted provided that the following conditions are met:
6
7   1) Redistributions of source code must retain the above copyright notice,
8   this list of conditions and the following disclaimer.
9
10   2) Redistributions in binary form must reproduce the above copyright notice,
11   this list of conditions and the following disclaimer in the documentation
12   and/or other materials provided with the distribution.
13
14   3) Neither the name of the Synopsys, Inc., nor the names of its contributors
15   may be used to endorse or promote products derived from this software
16   without specific prior written permission.
17
18   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22   LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23   CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28   POSSIBILITY OF SUCH DAMAGE.
29*/
30
31#include <sys/types.h>
32#include <sys/errno.h>
33
34extern char __start_heap;
35extern char __end_heap;
36
37caddr_t
38_sbrk (size_t nbytes)
39{
40  static char* heap_ptr = NULL;
41  char* prev_heap_ptr;
42
43  if (heap_ptr == NULL)
44    {
45      heap_ptr = &__start_heap;
46    }
47
48  /* Align the 'heap_ptr' so that memory will always be allocated at word
49     boundaries. */
50  heap_ptr = (char *) ((((unsigned long) heap_ptr) + 7) & ~7);
51  prev_heap_ptr = heap_ptr;
52
53  if ((heap_ptr + nbytes) < &__end_heap)
54    {
55      heap_ptr += nbytes;
56      return (caddr_t) prev_heap_ptr;
57    }
58
59  errno = ENOMEM;
60  return (caddr_t) -1;
61}
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