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