Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 126 insertions, 0 deletions

diff --git a/REORG.TODO/elf/dl-init.c b/REORG.TODO/elf/dl-init.c
new file mode 100644
index 0000000000..5c5f3de365
--- /dev/null
+++ b/REORG.TODO/elf/dl-init.c
@@ -0,0 +1,126 @@
+/* Run initializers for newly loaded objects.
+   Copyright (C) 1995-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <stddef.h>
+#include <ldsodefs.h>
+
+
+/* Type of the initializer.  */
+typedef void (*init_t) (int, char **, char **);
+
+
+static void
+call_init (struct link_map *l, int argc, char **argv, char **env)
+{
+  if (l->l_init_called)
+    /* This object is all done.  */
+    return;
+
+  /* Avoid handling this constructor again in case we have a circular
+     dependency.  */
+  l->l_init_called = 1;
+
+  /* Check for object which constructors we do not run here.  */
+  if (__builtin_expect (l->l_name[0], 'a') == '\0'
+      && l->l_type == lt_executable)
+    return;
+
+  /* Are there any constructors?  */
+  if (l->l_info[DT_INIT] == NULL
+      && __builtin_expect (l->l_info[DT_INIT_ARRAY] == NULL, 1))
+    return;
+
+  /* Print a debug message if wanted.  */
+  if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS))
+    _dl_debug_printf ("\ncalling init: %s\n\n",
+		      DSO_FILENAME (l->l_name));
+
+  /* Now run the local constructors.  There are two forms of them:
+     - the one named by DT_INIT
+     - the others in the DT_INIT_ARRAY.
+  */
+  if (l->l_info[DT_INIT] != NULL)
+    DL_CALL_DT_INIT(l, l->l_addr + l->l_info[DT_INIT]->d_un.d_ptr, argc, argv, env);
+
+  /* Next see whether there is an array with initialization functions.  */
+  ElfW(Dyn) *init_array = l->l_info[DT_INIT_ARRAY];
+  if (init_array != NULL)
+    {
+      unsigned int j;
+      unsigned int jm;
+      ElfW(Addr) *addrs;
+
+      jm = l->l_info[DT_INIT_ARRAYSZ]->d_un.d_val / sizeof (ElfW(Addr));
+
+      addrs = (ElfW(Addr) *) (init_array->d_un.d_ptr + l->l_addr);
+      for (j = 0; j < jm; ++j)
+	((init_t) addrs[j]) (argc, argv, env);
+    }
+}
+
+
+void
+internal_function
+_dl_init (struct link_map *main_map, int argc, char **argv, char **env)
+{
+  ElfW(Dyn) *preinit_array = main_map->l_info[DT_PREINIT_ARRAY];
+  ElfW(Dyn) *preinit_array_size = main_map->l_info[DT_PREINIT_ARRAYSZ];
+  unsigned int i;
+
+  if (__glibc_unlikely (GL(dl_initfirst) != NULL))
+    {
+      call_init (GL(dl_initfirst), argc, argv, env);
+      GL(dl_initfirst) = NULL;
+    }
+
+  /* Don't do anything if there is no preinit array.  */
+  if (__builtin_expect (preinit_array != NULL, 0)
+      && preinit_array_size != NULL
+      && (i = preinit_array_size->d_un.d_val / sizeof (ElfW(Addr))) > 0)
+    {
+      ElfW(Addr) *addrs;
+      unsigned int cnt;
+
+      if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS))
+	_dl_debug_printf ("\ncalling preinit: %s\n\n",
+			  DSO_FILENAME (main_map->l_name));
+
+      addrs = (ElfW(Addr) *) (preinit_array->d_un.d_ptr + main_map->l_addr);
+      for (cnt = 0; cnt < i; ++cnt)
+	((init_t) addrs[cnt]) (argc, argv, env);
+    }
+
+  /* Stupid users forced the ELF specification to be changed.  It now
+     says that the dynamic loader is responsible for determining the
+     order in which the constructors have to run.  The constructors
+     for all dependencies of an object must run before the constructor
+     for the object itself.  Circular dependencies are left unspecified.
+
+     This is highly questionable since it puts the burden on the dynamic
+     loader which has to find the dependencies at runtime instead of
+     letting the user do it right.  Stupidity rules!  */
+
+  i = main_map->l_searchlist.r_nlist;
+  while (i-- > 0)
+    call_init (main_map->l_initfini[i], argc, argv, env);
+
+#ifndef HAVE_INLINED_SYSCALLS
+  /* Finished starting up.  */
+  _dl_starting_up = 0;
+#endif
+}