if (addr >= l->l_addr && (!match || match->l_addr < l->l_addr))
if (l->l_addr != 0	 && addr >= l->l_addr && (!match || match->l_addr < l->l_addr))
_dl_addr (const void *address, Dl_info *info){  const ElfW(Addr) addr = (ElfW(Addr)) address;  struct link_map *l, *match;  const ElfW(Sym) *symtab, *matchsym;  const char *strtab;  /* Find the highest-addressed object that ADDRESS is not below.  */  match = NULL;  for (l = _dl_loaded; l; l = l->l_next)    if (addr >= l->l_addr && (!match || match->l_addr < l->l_addr))      match = l;  if (match)    {      /* We know ADDRESS lies within MATCH if in any shared object.	 Make sure it isn't past the end of MATCH's segments.  */      size_t n = match->l_phnum;      if (n > 0)	{	  do	    --n;	  while (match->l_phdr[n].p_type != PT_LOAD);	  if (addr >= (match->l_addr +		       match->l_phdr[n].p_vaddr + match->l_phdr[n].p_memsz))	    /* Off the end of the highest-addressed shared object.  */	    return 0;	}    }  else    return 0;  /* Now we know what object the address lies in.  */  info->dli_fname = match->l_name;  info->dli_fbase = (void *) match->l_addr;  symtab = ((void *) match->l_addr + match->l_info[DT_SYMTAB]->d_un.d_ptr);  strtab = ((void *) match->l_addr + match->l_info[DT_STRTAB]->d_un.d_ptr);  /* We assume that the string table follows the symbol table, because     there is no way in ELF to know the size of the dynamic symbol table!!  */  for (matchsym = NULL; (void *) symtab < (void *) strtab; ++symtab)    if (addr >= match->l_addr + symtab->st_value	&& (!matchsym	    || (matchsym->st_value < symtab->st_value		&& (ELFW(ST_BIND) (symtab->st_info) == STB_GLOBAL		    || ELFW(ST_BIND) (symtab->st_info) == STB_WEAK))))      matchsym = symtab;  if (matchsym)    {      /* We found a symbol close by.  Fill in its name and exact address.  */      info->dli_sname = strtab + matchsym->st_name;      info->dli_saddr = (void *) (match->l_addr + matchsym->st_value);    }  else    {      /* No symbol matches.  We return only the containing object.  */      info->dli_sname = NULL;      info->dli_saddr = NULL;    }  return 1;}