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stdlib_private.h
1 /* Copyright (c) 2004, Joerg Wunsch
2 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 * Redistributions of source code must retain the above copyright
8 notice, this list of conditions and the following disclaimer.
9 * Redistributions in binary form must reproduce the above copyright
10 notice, this list of conditions and the following disclaimer in
11 the documentation and/or other materials provided with the
12 distribution.
13 * Neither the name of the copyright holders nor the names of
14 contributors may be used to endorse or promote products derived
15 from this software without specific prior written permission.
16
17 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
21 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 /* $Id: stdlib_private.h 1657 2008-03-24 17:11:08Z arcanum $ */
31
32 #include <inttypes.h>
33 #include <stdlib.h>
34 #include <avr/io.h>
35
36 #if !defined(__DOXYGEN__)
37
38 struct __freelist {
39 size_t sz;
40 struct __freelist *nx;
41 };
42
43 #endif
44
45 extern char *__brkval; /* first location not yet allocated */
46 extern struct __freelist *__flp; /* freelist pointer (head of freelist) */
47 extern size_t __malloc_margin; /* user-changeable before the first malloc() */
48 extern char *__malloc_heap_start;
49 extern char *__malloc_heap_end;
50
51 #ifndef __AVR__
52
53 /*
54 * When compiling malloc.c/realloc.c natively on a host machine, it will
55 * include a main() that performs a regression test. This is meant as
56 * a debugging aid, where a normal source-level debugger will help to
57 * verify that the various allocator structures have the desired
58 * appearance at each stage.
59 *
60 * When cross-compiling with avr-gcc, it will compile into just the
61 * library functions malloc() and free().
62 */
63 #define MALLOC_TEST
64
65 #endif /* !__AVR__ */
66
67 #ifdef MALLOC_TEST
68
69 extern void *mymalloc(size_t);
70 extern void myfree(void *);
71 extern void *myrealloc(void *, size_t);
72
73 #define malloc mymalloc
74 #define free myfree
75 #define realloc myrealloc
76
77 #define __heap_start mymem[0]
78 #define __heap_end mymem[256]
79 extern char mymem[];
80 #define STACK_POINTER() (mymem + 256)
81
82 #else /* !MALLOC_TEST */
83
84 extern char __heap_start;
85 extern char __heap_end;
86
87 /* Needed for definition of AVR_STACK_POINTER_REG. */
88 #include <avr/io.h>
89
90 #define STACK_POINTER() ((char *)AVR_STACK_POINTER_REG)
91
92 #endif /* MALLOC_TEST */

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