elf/soinit.c

   1 /* Initializer module for building the ELF shared C library.  This file and
   2    sofini.c do the work normally done by crtbeginS.o and crtendS.o, to wrap
   3    the `.ctors' and `.dtors' sections so the lists are terminated, and
   4    calling those lists of functions.  */
   5
   6 #include <libc-internal.h>
   7 #include <stdlib.h>
   8
   9 static void (*const __CTOR_LIST__[1]) (void)
  10      __attribute__ ((section (".ctors")))
  11      = { (void (*) (void)) -1 };
  12 static void (*const __DTOR_LIST__[1]) (void)
  13      __attribute__ ((section (".dtors")))
  14      = { (void (*) (void)) -1 };
  15
  16 static inline void
  17 run_hooks (void (*const list[]) (void))
  18 {
  19   while (*++list)
  20     (**list) ();
  21 }
  22
  23 static const char __EH_FRAME_BEGIN__[]
  24   __attribute__ ((used, section (".eh_frame")))
  25   = { };
  26
  27 /* This function will be called from _init in init-first.c.  */
  28 void
  29 __libc_global_ctors (void)
  30 {
  31   /* Call constructor functions.  */
  32   run_hooks (__CTOR_LIST__);
  33 }
  34
  35
  36 /* This function becomes the DT_FINI termination function
  37    for the C library.  */
  38 void
  39 __libc_fini (void)
  40 {
  41   /* Call destructor functions.  */
  42   run_hooks (__DTOR_LIST__);
  43 }
  44
  45 void (*_fini_ptr) (void) __attribute__ ((section (".fini_array")))
  46      = &__libc_fini;