stdlib_private.h

/* Copyright (c) 2004, Joerg Wunsch
   All rights reserved.
 
   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are met:
 
   * Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
   * Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
     distribution.
   * Neither the name of the copyright holders nor the names of
     contributors may be used to endorse or promote products derived
     from this software without specific prior written permission.
 
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  POSSIBILITY OF SUCH DAMAGE. */
 
#include <inttypes.h>
#include <stdlib.h>
#include <avr/io.h>
 
#if !defined(__DOXYGEN__)
 
struct __freelist {
    size_t sz;
    struct __freelist *nx;
};
 
#endif
 
extern char *__brkval;      /* first location not yet allocated */
extern struct __freelist *__flp; /* freelist pointer (head of freelist) */
extern size_t __malloc_margin;  /* user-changeable before the first malloc() */
extern char *__malloc_heap_start;
extern char *__malloc_heap_end;
 
#ifndef __AVR__
 
/*
 * When compiling malloc.c/realloc.c natively on a host machine, it will
 * include a main() that performs a regression test.  This is meant as
 * a debugging aid, where a normal source-level debugger will help to
 * verify that the various allocator structures have the desired
 * appearance at each stage.
 *
 * When cross-compiling with avr-gcc, it will compile into just the
 * library functions malloc() and free().
 */
#define MALLOC_TEST
 
#endif /* !__AVR__ */
 
#ifdef MALLOC_TEST
 
extern void *mymalloc(size_t);
extern void myfree(void *);
extern void *myrealloc(void *, size_t);
 
#define malloc mymalloc
#define free myfree
#define realloc myrealloc
 
#define __heap_start mymem[0]
#define __heap_end mymem[256]
extern char mymem[];
#define STACK_POINTER() (mymem + 256)
 
#else /* !MALLOC_TEST */
 
extern char __heap_start;
extern char __heap_end;
 
#define STACK_POINTER() ((char *) SP)
 
#endif /* MALLOC_TEST */