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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [libgloss/] [sparc/] [fixctors.c] - Blame information for rev 262

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Line No. Rev Author Line
1 148 jeremybenn
/* Code to byte-swap static constructor/destructor tables on
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   broken a.out little-endian targets. The startup code should call
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   __fix_ctors just before calling main.  It is safe to use on non-broken
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   or big-endian targets. */
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extern long __CTOR_LIST__[];
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extern long __DTOR_LIST__[];
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static void
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byte_swap (long *entry)
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{
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  unsigned char *p = (unsigned char *)entry;
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  unsigned char tmp;
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  tmp = p[0];
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  p[0] = p[3];
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  p[3] = tmp;
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  tmp = p[1];
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  p[1] = p[2];
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  p[2] = tmp;
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}
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static void
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fix_table (long *table)
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{
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  long len = table[0];
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  /* The heuristic for deciding if a table is broken is to examine
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     the word at the start of the table, which contains the number
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     of function pointers immediately following.  If the low word
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     is zero, and the high word is non-zero, it's very likely that
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     it is byte-swapped.  This test will fail if the program has
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     an exact multiple of 64K static constructors or destructors, a very
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     unlikely situation. */
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  if ((len & 0xffff) == 0 && (len & 0xffff0000) != 0)
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    {
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      /* The table looks broken.  Byte-swap all the words in the table, up
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         to a NULL entry, which marks the end of the table. */
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      do
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        {
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          byte_swap (table);
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          table++;
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        }
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      while (*table);
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    }
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}
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void
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__fix_ctors (void)
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{
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  fix_table (__CTOR_LIST__);
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  fix_table (__DTOR_LIST__);
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}

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