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#include <stdlib.h>
extern unsigned char _heap, _eheap;
static size_t free_mem_ptr = (size_t)&_heap; /* Start of heap */
static size_t free_mem_end_ptr = (size_t)&_eheap; /* End of heap */
void malloc_mark(malloc_mark_t *place)
{
*place = free_mem_ptr;
}
void malloc_release(malloc_mark_t *ptr)
{
free_mem_ptr = *ptr;
}
void *malloc(size_t size)
{
void *p;
if (size < 0)
error("Error! malloc: Size < 0");
if (free_mem_ptr <= 0)
error("Error! malloc: Free_mem_ptr <= 0");
free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
p = (void *) free_mem_ptr;
free_mem_ptr += size;
if (free_mem_ptr >= free_mem_end_ptr)
error("Error! malloc: Free_mem_ptr >= free_mem_end_ptr");
return p;
}
void free(void *where)
{
/* Don't care */
}
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