diff options
Diffstat (limited to 'elf')
| -rw-r--r-- | elf/Makefile | 5 | ||||
| -rw-r--r-- | elf/sofini.c | 9 | ||||
| -rw-r--r-- | elf/soinit.c | 38 |
3 files changed, 50 insertions, 2 deletions
diff --git a/elf/Makefile b/elf/Makefile index b0923b2..0065d2b 100644 --- a/elf/Makefile +++ b/elf/Makefile @@ -31,12 +31,13 @@ LDFLAGS-dl.so := -e 0 # work around ld bug rtld-routines := rtld $(addprefix dl-,load lookup object reloc \ runtime sysdep error init fini) -distribute = $(rtld-routines:=.c) dynamic-link.h do-rel.h +distribute = $(rtld-routines:=.c) dynamic-link.h do-rel.h \ + soinit.c sofini.c include ../Makeconfig ifeq (yes,$(build-shared)) -extra-objs = $(rtld-routines:=.so) +extra-objs = $(rtld-routines:=.so) soinit.so sofini.so install-lib = ld.so endif diff --git a/elf/sofini.c b/elf/sofini.c new file mode 100644 index 0000000..e44041b --- /dev/null +++ b/elf/sofini.c @@ -0,0 +1,9 @@ +/* Finalizer module for ELF shared C library. This provides terminating + null pointer words in the `.ctors' and `.dtors' sections. */ + +static void (*const __CTOR_END__[1]) (void) + __attribute__ ((unused, section (".ctors"))) + = { 0 }; +static void (*const __DTOR_END__[1]) (void) + __attribute__ ((unused, section (".dtors"))) + = { 0 }; diff --git a/elf/soinit.c b/elf/soinit.c new file mode 100644 index 0000000..0310b74 --- /dev/null +++ b/elf/soinit.c @@ -0,0 +1,38 @@ +/* Initializer module for building the ELF shared C library. This file and + sofini.c do the work normally done by crtbeginS.o and crtendS.o, to wrap + the `.ctors' and `.dtors' sections so the lists are terminated, and + calling those lists of functions. */ + +static void (*const __CTOR_LIST__[1]) (void) + __attribute__ ((section (".ctors"))) + = { (void (*) (void)) -1 }; +static void (*const __DTOR_LIST__[1]) (void) + __attribute__ ((section (".dtors"))) + = { (void (*) (void)) -1 }; + +static inline void +run_hooks (void (*const list[]) (void)) +{ + while (*++list) + (**list) (); +} + + +/* This function will be called from _init in init-first.c. */ +void +__libc_global_ctors (void) +{ + /* Call constructor functions. */ + run_hooks (__CTOR_LIST__); +} + + +/* This function becomes the DT_FINI termination function + for the C library. */ +void _fini (void) __attribute__ ((section (".fini"))); /* Just for kicks. */ +void +_fini (void) +{ + /* Call destructor functions. */ + run_hooks (__DTOR_LIST__); +} |