3849 implement __cxa_atexit/__cxa_finalize

*** 830,849 ****
  
  /*
   * atexit() data structures.
   * See port/gen/atexit.c for details.
   */
! typedef void (*_exithdlr_func_t) (void);
  
  typedef struct _exthdlr {
          struct _exthdlr         *next;  /* next in handler list */
          _exithdlr_func_t        hdlr;   /* handler itself */
  } _exthdlr_t;
  
  typedef struct {
          mutex_t         exitfns_lock;
          _exthdlr_t      *head;
          void            *exit_frame_monitor;
          char            exit_pad[64 -   /* pad out to 64 bytes */
                  (sizeof (mutex_t) + sizeof (_exthdlr_t *) + sizeof (void *))];
  } atexit_root_t;
  
--- 830,858 ----
  
  /*
   * atexit() data structures.
   * See port/gen/atexit.c for details.
   */
! typedef void (*_exithdlr_func_t) (void*);
  
  typedef struct _exthdlr {
          struct _exthdlr         *next;  /* next in handler list */
          _exithdlr_func_t        hdlr;   /* handler itself */
+         void                    *arg;   /* argument to handler */
+         void                    *dso;   /* DSO associated with handler */
  } _exthdlr_t;
  
  typedef struct {
          mutex_t         exitfns_lock;
          _exthdlr_t      *head;
+         /*
+          * exit_frame_monitor is part of a private contract between libc and
+          * the Sun C++ runtime.
+          *
+          * It should be NULL until exit() is called, and thereafter hold the
+          * frame pointer of the function implementing our exit processing.
+          */
          void            *exit_frame_monitor;
          char            exit_pad[64 -   /* pad out to 64 bytes */
                  (sizeof (mutex_t) + sizeof (_exthdlr_t *) + sizeof (void *))];
  } atexit_root_t;