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, 159 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/tile/dl-runtime.c b/REORG.TODO/sysdeps/tile/dl-runtime.c
new file mode 100644
index 0000000000..3aced41643
--- /dev/null
+++ b/REORG.TODO/sysdeps/tile/dl-runtime.c
@@ -0,0 +1,159 @@
+/* Copyright (C) 2011-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
+
+   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/>.  */
+
+/* Like x86_64, we pass the index of the relocation and not its offset.
+   In _dl_profile_fixup and _dl_call_pltexit we also use the index.
+   Therefore it is wasteful to compute the offset in the trampoline
+   just to reverse the operation immediately afterwards.  */
+#define reloc_offset reloc_arg * sizeof (PLTREL)
+#define reloc_index  reloc_arg
+
+#include <elf/dl-runtime.c>
+
+#include <sys/mman.h>
+#include <arch/sim.h>
+#include <dl-unmap-segments.h>
+
+/* Like realpath(), but simplified: no dynamic memory use, no lstat(),
+   no set_errno(), no valid "rpath" on error, etc.  This handles some
+   simple cases where the simulator might not have a valid entry for
+   a loaded Elf object, in particular dlopen() with a relative path.
+   For this relatively rare case, one could also imagine using
+   link_map.l_origin to avoid the getcwd() here, but the simpler code
+   here seems like a better solution.  */
+static char *
+dl_realpath (const char *name, char *rpath)
+{
+  char *dest;
+  const char *start, *end;
+
+  if (name[0] != '/')
+    {
+      if (!__getcwd (rpath, PATH_MAX))
+        return NULL;
+      dest = __rawmemchr (rpath, '\0');
+    }
+  else
+    {
+      rpath[0] = '/';
+      dest = rpath + 1;
+    }
+
+  for (start = end = name; *start; start = end)
+    {
+      /* Skip sequence of multiple path-separators.  */
+      while (*start == '/')
+	++start;
+
+      /* Find end of path component.  */
+      for (end = start; *end && *end != '/'; ++end)
+	/* Nothing.  */;
+
+      if (end - start == 0)
+	break;
+      else if (end - start == 1 && start[0] == '.')
+	/* nothing */;
+      else if (end - start == 2 && start[0] == '.' && start[1] == '.')
+	{
+	  /* Back up to previous component, ignore if at root already.  */
+	  if (dest > rpath + 1)
+	    while ((--dest)[-1] != '/');
+	}
+      else
+	{
+	  if (dest[-1] != '/')
+	    *dest++ = '/';
+
+	  if (dest + (end - start) >= rpath + PATH_MAX)
+            return NULL;
+
+	  dest = __mempcpy (dest, start, end - start);
+	  *dest = '\0';
+	}
+    }
+  if (dest > rpath + 1 && dest[-1] == '/')
+    --dest;
+  *dest = '\0';
+
+  return rpath;
+}
+
+/* Support notifying the simulator about new objects.  */
+void internal_function
+_dl_after_load (struct link_map *l)
+{
+  int shift;
+  char pathbuf[PATH_MAX];
+  char *path;
+
+  /* Don't bother if not in the simulator. */
+  if (__insn_mfspr (SPR_SIM_CONTROL) == 0)
+    return;
+
+#define DLPUTC(c) __insn_mtspr (SPR_SIM_CONTROL,                         \
+                                (SIM_CONTROL_DLOPEN                      \
+                                 | ((c) << _SIM_CONTROL_OPERATOR_BITS)))
+
+  /* Write the library address in hex.  */
+  DLPUTC ('0');
+  DLPUTC ('x');
+  for (shift = (int) sizeof (unsigned long) * 8 - 4; shift >= 0; shift -= 4)
+    DLPUTC ("0123456789abcdef"[(l->l_map_start >> shift) & 0xF]);
+  DLPUTC (':');
+
+  /* Write the library path, including the terminating '\0'.  */
+  path = dl_realpath (l->l_name, pathbuf) ?: l->l_name;
+  for (size_t i = 0;; i++)
+    {
+      DLPUTC (path[i]);
+      if (path[i] == '\0')
+        break;
+    }
+#undef DLPUTC
+}
+
+/* Support notifying the simulator about removed objects prior to munmap().  */
+static void
+sim_dlclose (ElfW(Addr) map_start)
+{
+  int shift;
+
+  /* Don't bother if not in the simulator.  */
+  if (__insn_mfspr (SPR_SIM_CONTROL) == 0)
+    return;
+
+#define DLPUTC(c) __insn_mtspr (SPR_SIM_CONTROL,                         \
+                                (SIM_CONTROL_DLCLOSE                     \
+                                 | ((c) << _SIM_CONTROL_OPERATOR_BITS)))
+
+  /* Write the library address in hex.  */
+  DLPUTC ('0');
+  DLPUTC ('x');
+  for (shift = (int) sizeof (unsigned long) * 8 - 4; shift >= 0; shift -= 4)
+    DLPUTC ("0123456789abcdef"[(map_start >> shift) & 0xF]);
+  DLPUTC ('\0');
+
+#undef DLPUTC
+}
+
+void internal_function
+_dl_unmap (struct link_map *map)
+{
+  sim_dlclose (map->l_map_start);
+  _dl_unmap_segments (map);
+}