Subversion Repositories openrisc_2011-10-31

/* Code to byte-swap static constructor/destructor tables on

   broken a.out little-endian targets. The startup code should call

   __fix_ctors just before calling main.  It is safe to use on non-broken

   or big-endian targets. */

extern long __CTOR_LIST__[];

extern long __DTOR_LIST__[];

static void

byte_swap (long *entry)

{

  unsigned char *p = (unsigned char *)entry;

  unsigned char tmp;

  tmp = p[0];

  p[0] = p[3];

  p[3] = tmp;

  tmp = p[1];

  p[1] = p[2];

  p[2] = tmp;

}

static void

fix_table (long *table)

{

  long len = table[0];

  /* The heuristic for deciding if a table is broken is to examine

     the word at the start of the table, which contains the number

     of function pointers immediately following.  If the low word

     is zero, and the high word is non-zero, it's very likely that

     it is byte-swapped.  This test will fail if the program has

     an exact multiple of 64K static constructors or destructors, a very

     unlikely situation. */

  if ((len & 0xffff) == 0 && (len & 0xffff0000) != 0)

    {

      /* The table looks broken.  Byte-swap all the words in the table, up

         to a NULL entry, which marks the end of the table. */

      do

        {

          byte_swap (table);

          table++;

        }

      while (*table);

    }

}

void

__fix_ctors (void)

{

  fix_table (__CTOR_LIST__);

  fix_table (__DTOR_LIST__);

}