if (_dl_rtld_map.l_info[DT_DEBUG]) _dl_rtld_map.l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r;
dl_main (const ElfW(Phdr) *phdr,	 ElfW(Half) phent,	 ElfW(Addr) *user_entry){  const ElfW(Phdr) *ph;  struct link_map *l;  int lazy;  int list_only = 0;  if (*user_entry == (ElfW(Addr)) &_start)    {      /* Ho ho.  We are not the program interpreter!  We are the program	 itself!  This means someone ran ld.so as a command.  Well, that	 might be convenient to do sometimes.  We support it by	 interpreting the args like this:	 ld.so PROGRAM ARGS...	 The first argument is the name of a file containing an ELF	 executable we will load and run with the following arguments.	 To simplify life here, PROGRAM is searched for using the	 normal rules for shared objects, rather than $PATH or anything	 like that.  We just load it and use its entry point; we don't	 pay attention to its PT_INTERP command (we are the interpreter	 ourselves).  This is an easy way to test a new ld.so before	 installing it.  */      if (_dl_argc < 2)	_dl_sysdep_fatal ("\Usage: ld.so [--list] EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]\n\You have invoked `ld.so', the helper program for shared library executables.\n\This program usually lives in the file `/lib/ld.so', and special directives\n\in executable files using ELF shared libraries tell the system's program\n\loader to load the helper program from this file.  This helper program loads\n\the shared libraries needed by the program executable, prepares the program\n\to run, and runs it.  You may invoke this helper program directly from the\n\command line to load and run an ELF executable file; this is like executing\n\that file itself, but always uses this helper program from the file you\n\specified, instead of the helper program file specified in the executable\n\file you run.  This is mostly of use for maintainers to test new versions\n\of this helper program; chances are you did not intend to run this program.\n",			  NULL);      /* Note the place where the dynamic linker actually came from.  */      _dl_rtld_map.l_name = _dl_argv[0];      if (! strcmp (_dl_argv[1], "--list"))	{	  list_only = 1;	  ++_dl_skip_args;	  --_dl_argc;	  ++_dl_argv;	}      ++_dl_skip_args;      --_dl_argc;      ++_dl_argv;      l = _dl_map_object (NULL, _dl_argv[0], lt_library);      phdr = l->l_phdr;      phent = l->l_phnum;      l->l_name = (char *) "";      *user_entry = l->l_entry;    }  else    {      /* Create a link_map for the executable itself.	 This will be what dlopen on "" returns.  */      l = _dl_new_object ((char *) "", "", lt_library);      l->l_phdr = phdr;      l->l_phnum = phent;      l->l_entry = *user_entry;    }  if (l != _dl_loaded)    {      /* GDB assumes that the first element on the chain is the	 link_map for the executable itself, and always skips it.	 Make sure the first one is indeed that one.  */      l->l_prev->l_next = l->l_next;      if (l->l_next)	l->l_next->l_prev = l->l_prev;      l->l_prev = NULL;      l->l_next = _dl_loaded;      _dl_loaded->l_prev = l;      _dl_loaded = l;    }  /* Scan the program header table for the dynamic section.  */  for (ph = phdr; ph < &phdr[phent]; ++ph)    switch (ph->p_type)      {      case PT_DYNAMIC:	/* This tells us where to find the dynamic section,	   which tells us everything we need to do.  */	l->l_ld = (void *) l->l_addr + ph->p_vaddr;	break;      case PT_INTERP:	/* This "interpreter segment" was used by the program loader to	   find the program interpreter, which is this program itself, the	   dynamic linker.  We note what name finds us, so that a future	   dlopen call or DT_NEEDED entry, for something that wants to link	   against the dynamic linker as a shared library, will know that	   the shared object is already loaded.  */	_dl_rtld_map.l_libname = (const char *) l->l_addr + ph->p_vaddr;	break;      }  if (! _dl_rtld_map.l_libname && _dl_rtld_map.l_name)    /* We were invoked directly, so the program might not have a PT_INTERP.  */    _dl_rtld_map.l_libname = _dl_rtld_map.l_name;  else    assert (_dl_rtld_map.l_libname); /* How else did we get here?  */  /* Extract the contents of the dynamic section for easy access.  */  elf_get_dynamic_info (l->l_ld, l->l_info);  if (l->l_info[DT_HASH])    /* Set up our cache of pointers into the hash table.  */    _dl_setup_hash (l);  /* Put the link_map for ourselves on the chain so it can be found by     name.  */  if (! _dl_rtld_map.l_name)    /* If not invoked directly, the dynamic linker shared object file was       found by the PT_INTERP name.  */    _dl_rtld_map.l_name = (char *) _dl_rtld_map.l_libname;  _dl_rtld_map.l_type = lt_library;  while (l->l_next)    l = l->l_next;  l->l_next = &_dl_rtld_map;  _dl_rtld_map.l_prev = l;  /* Load all the libraries specified by DT_NEEDED entries.  */  _dl_map_object_deps (l);  /* We are done mapping things, so close the zero-fill descriptor.  */  __close (_dl_zerofd);  _dl_zerofd = -1;  /* Remove _dl_rtld_map from the chain.  */  _dl_rtld_map.l_prev->l_next = _dl_rtld_map.l_next;  if (_dl_rtld_map.l_next)    _dl_rtld_map.l_next->l_prev = _dl_rtld_map.l_prev;  if (_dl_rtld_map.l_opencount)    {      /* Some DT_NEEDED entry referred to the interpreter object itself, so	 put it back in the list of visible objects.  We insert it into the	 chain in symbol search order because gdb uses the chain's order as	 its symbol search order.  */      unsigned int i = 1;      while (l->l_searchlist[i] != &_dl_rtld_map)	++i;      _dl_rtld_map.l_prev = l->l_searchlist[i - 1];      _dl_rtld_map.l_next = (i + 1 < l->l_nsearchlist ?			     l->l_searchlist[i + 1] : NULL);      assert (_dl_rtld_map.l_prev->l_next == _dl_rtld_map.l_next);      _dl_rtld_map.l_prev->l_next = &_dl_rtld_map;      if (_dl_rtld_map.l_next)	{	  assert (_dl_rtld_map.l_next->l_prev == _dl_rtld_map.l_prev);	  _dl_rtld_map.l_next->l_prev = &_dl_rtld_map;	}    }  if (list_only)    {      /* We were run just to list the shared libraries.  It is	 important that we do this before real relocation, because the	 functions we call below for output may no longer work properly	 after relocation.  */      int i;      if (! _dl_loaded->l_info[DT_NEEDED])	_dl_sysdep_message ("\t", "statically linked\n", NULL);      else	for (l = _dl_loaded->l_next; l; l = l->l_next)	  {	    char buf[20], *bp;	    buf[sizeof buf - 1] = '\0';	    bp = _itoa (l->l_addr, &buf[sizeof buf - 1], 16, 0);	    while (&buf[sizeof buf - 1] - bp < sizeof l->l_addr * 2)	      *--bp = '0';	    _dl_sysdep_message ("\t", l->l_libname, " => ", l->l_name,				" (0x", bp, ")\n", NULL);	  }      for (i = 1; i < _dl_argc; ++i)	{	  const ElfW(Sym) *ref = NULL;	  ElfW(Addr) loadbase = _dl_lookup_symbol (_dl_argv[i], &ref,						   &_dl_default_scope[2],						   "argument", 0, 0);	  char buf[20], *bp;	  buf[sizeof buf - 1] = '\0';	  bp = _itoa (ref->st_value, &buf[sizeof buf - 1], 16, 0);	  while (&buf[sizeof buf - 1] - bp < sizeof loadbase * 2)	    *--bp = '0';	  _dl_sysdep_message (_dl_argv[i], " found at 0x", bp, NULL);	  buf[sizeof buf - 1] = '\0';	  bp = _itoa (loadbase, &buf[sizeof buf - 1], 16, 0);	  while (&buf[sizeof buf - 1] - bp < sizeof loadbase * 2)	    *--bp = '0';	  _dl_sysdep_message (" in object at 0x", bp, "\n", NULL);	}      _exit (0);    }  lazy = !_dl_secure && *(getenv ("LD_BIND_NOW") ?: "") == '\0';  {    /* Now we have all the objects loaded.  Relocate them all except for       the dynamic linker itself.  We do this in reverse order so that copy       relocs of earlier objects overwrite the data written by later       objects.  We do not re-relocate the dynamic linker itself in this       loop because that could result in the GOT entries for functions we       call being changed, and that would break us.  It is safe to relocate       the dynamic linker out of order because it has no copy relocs (we       know that because it is self-contained).  */    l = _dl_loaded;    while (l->l_next)      l = l->l_next;    do      {	if (l != &_dl_rtld_map)	  {	    _dl_relocate_object (l, _dl_object_relocation_scope (l), lazy);	    *_dl_global_scope_end = NULL;	  }	l = l->l_prev;      } while (l);    /* Do any necessary cleanups for the startup OS interface code.       We do these now so that no calls are made after rtld re-relocation       which might be resolved to different functions than we expect.       We cannot do this before relocating the other objects because       _dl_relocate_object might need to call `mprotect' for DT_TEXTREL.  */    _dl_sysdep_start_cleanup ();    if (_dl_rtld_map.l_opencount > 0)      /* There was an explicit ref to the dynamic linker as a shared lib.	 Re-relocate ourselves with user-controlled symbol definitions.  */      _dl_relocate_object (&_dl_rtld_map, &_dl_default_scope[2], 0);  }  {    /* Initialize _r_debug.  */    struct r_debug *r = _dl_debug_initialize (_dl_rtld_map.l_addr);    l = _dl_loaded;    if (l->l_info[DT_DEBUG])      /* There is a DT_DEBUG entry in the dynamic section.  Fill it in	 with the run-time address of the r_debug structure  */      l->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r;    /* Notify the debugger that all objects are now mapped in.  */    r->r_state = RT_ADD;    _dl_debug_state ();  }  if (_dl_rtld_map.l_info[DT_INIT])    {      /* Call the initializer for the compatibility version of the	 dynamic linker.  There is no additional initialization	 required for the ABI-compliant dynamic linker.  */      (*(void (*) (void)) (_dl_rtld_map.l_addr +			   _dl_rtld_map.l_info[DT_INIT]->d_un.d_ptr)) ();      /* Clear the field so a future dlopen won't run it again.  */      _dl_rtld_map.l_info[DT_INIT] = NULL;    }  /* Once we return, _dl_sysdep_start will invoke     the DT_INIT functions and then *USER_ENTRY.  */}