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stdlib_private.h

00001 /* Copyright (c) 2004, Joerg Wunsch
00002    All rights reserved.
00003 
00004    Redistribution and use in source and binary forms, with or without
00005    modification, are permitted provided that the following conditions are met:
00006 
00007    * Redistributions of source code must retain the above copyright
00008      notice, this list of conditions and the following disclaimer.
00009    * Redistributions in binary form must reproduce the above copyright
00010      notice, this list of conditions and the following disclaimer in
00011      the documentation and/or other materials provided with the
00012      distribution.
00013    * Neither the name of the copyright holders nor the names of
00014      contributors may be used to endorse or promote products derived
00015      from this software without specific prior written permission.
00016 
00017   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
00018   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
00021   LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
00022   CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
00023   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
00024   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
00025   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
00026   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
00027   POSSIBILITY OF SUCH DAMAGE.
00028 */
00029 
00030 /* $Id: stdlib_private.h 1657 2008-03-24 17:11:08Z arcanum $ */
00031 
00032 #include <inttypes.h>
00033 #include <stdlib.h>
00034 #include <avr/io.h>
00035 
00036 #if !defined(__DOXYGEN__)
00037 
00038 struct __freelist {
00039         size_t sz;
00040         struct __freelist *nx;
00041 };
00042 
00043 #endif
00044 
00045 extern char *__brkval;          /* first location not yet allocated */
00046 extern struct __freelist *__flp; /* freelist pointer (head of freelist) */
00047 extern size_t __malloc_margin;  /* user-changeable before the first malloc() */
00048 extern char *__malloc_heap_start;
00049 extern char *__malloc_heap_end;
00050 
00051 #ifndef __AVR__
00052 
00053 /*
00054  * When compiling malloc.c/realloc.c natively on a host machine, it will
00055  * include a main() that performs a regression test.  This is meant as
00056  * a debugging aid, where a normal source-level debugger will help to
00057  * verify that the various allocator structures have the desired
00058  * appearance at each stage.
00059  *
00060  * When cross-compiling with avr-gcc, it will compile into just the
00061  * library functions malloc() and free().
00062  */
00063 #define MALLOC_TEST
00064 
00065 #endif /* !__AVR__ */
00066 
00067 #ifdef MALLOC_TEST
00068 
00069 extern void *mymalloc(size_t);
00070 extern void myfree(void *);
00071 extern void *myrealloc(void *, size_t);
00072 
00073 #define malloc mymalloc
00074 #define free myfree
00075 #define realloc myrealloc
00076 
00077 #define __heap_start mymem[0]
00078 #define __heap_end mymem[256]
00079 extern char mymem[];    
00080 #define STACK_POINTER() (mymem + 256)
00081 
00082 #else /* !MALLOC_TEST */
00083          
00084 extern char __heap_start;
00085 extern char __heap_end;
00086 
00087 /* Needed for definition of AVR_STACK_POINTER_REG. */
00088 #include <avr/io.h>
00089 
00090 #define STACK_POINTER() ((char *)AVR_STACK_POINTER_REG)
00091 
00092 #endif /* MALLOC_TEST */

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