35 lines
795 B
C
35 lines
795 B
C
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "syscall.h"
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#include "eit.h"
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caddr_t
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_sbrk (int incr)
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{
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/* `_end' is defined in the linker script.
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We must handle it carefully as we don't want the compiler to think
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it lives in the small data area. Use medium model to ensure 32 bit
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addressability. */
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extern char _end __attribute__ ((__model__(__medium__)));
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static char *heap_end;
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char *prev_heap_end;
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char *sp = (char *)&sp;
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if (heap_end == 0)
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{
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heap_end = &_end;
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}
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prev_heap_end = heap_end;
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if (heap_end > sp)
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{
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_write (1, "Heap and stack collision\n", 25);
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#if 0 /* Calling abort brings in the signal handling code. */
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abort ();
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#else
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exit (1);
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#endif
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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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