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authorRoland McGrath <roland@gnu.org>1995-09-21 06:24:21 +0000
committerRoland McGrath <roland@gnu.org>1995-09-21 06:24:21 +0000
commit0324daa0055227fdb157b8491d4e5bbe9d9d579a (patch)
tree1cc1994ae9fa52ba09e28498b50911628f366add /elf
parent600927014b78e4247e36bbc554c188c7a3cca40e (diff)
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Thu Sep 21 00:03:53 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>
* sysdeps/stub/sys/sem_buf.h (union semun): New type. * sysdeps/mach/hurd/i386/init-first.c (init1) [PIC]: Call __libc_global_ctors. * sysdeps/i386/init-first.c: Rewritten. * sysdeps/unix/sysv/linux/i386/init-first.S: File removed. * sysdeps/unix/sysv/linux/i386/init-first.c: New file. * sysdeps/unix/sysv/linux/i386/fpu_control.h: Fix name in decl of ___fpu_control. * Makerules (build-shlib): New canned sequence, broken out of lib%.so rule. Link in $^ instead of just $<. (lib%.so: lib%_pic.a): Use it. (libc.so): New target; use $(build-shlib) for cmds, but also depend on soinit.so first and sofini.so last. * elf/soinit.c: New file. * elf/sofini.c: New file. * elf/Makefile (distribute): Add soinit.c and sofini.c. (extra-objs): Add soinit.so and sofini.so. * sysvipc/sys/shm.h (shmat): Fix return type to char *. * sysdeps/stub/sys/ipc_buf.h (key_t): Type removed. * misc/syslog.c (vsyslog): Rewritten using open_memstream to dynamically allocate buffers. * Makerules (install-lib-nosubdir): Make this, rather than install-no-libc.a, depend on the installed shared libraries.
Diffstat (limited to 'elf')
-rw-r--r--elf/Makefile5
-rw-r--r--elf/sofini.c9
-rw-r--r--elf/soinit.c38
3 files changed, 50 insertions, 2 deletions
diff --git a/elf/Makefile b/elf/Makefile
index b0923b2b6d..0065d2ba47 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 0000000000..e44041b5ec
--- /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 0000000000..0310b74b93
--- /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__);
+}