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32 lines
526 B
32 lines
526 B
#include <errno.h>
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#include <stdio.h>
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register char * stack_ptr asm("sp");
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caddr_t _sbrk(int incr)
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{
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extern char end __asm("end");
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static char *heap_end;
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char *prev_heap_end;
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if (heap_end == 0)
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heap_end = &end;
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prev_heap_end = heap_end;
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if (heap_end + incr > stack_ptr)
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{
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// write(1, "Heap and stack collision\n", 25);
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// abort();
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errno = ENOMEM;
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return (caddr_t) -1;
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}
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heap_end += incr;
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return (caddr_t) prev_heap_end;
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}
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// Other systcalls are defined in
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// - com/com_fileio.c
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// - hw_utils/reset.h
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