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, 212 insertions, 0 deletions

diff --git a/REORG.TODO/elf/readlib.c b/REORG.TODO/elf/readlib.c
new file mode 100644
index 0000000000..d278a189b2
--- /dev/null
+++ b/REORG.TODO/elf/readlib.c
@@ -0,0 +1,212 @@
+/* Copyright (C) 1999-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Andreas Jaeger <aj@suse.de>, 1999 and
+		  Jakub Jelinek <jakub@redhat.com>, 1999.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published
+   by the Free Software Foundation; version 2 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, see <http://www.gnu.org/licenses/>.  */
+
+/* The code in this file and in readelflib is a heavily simplified
+   version of the readelf program that's part of the current binutils
+   development version.  Besides the simplification, it has also been
+   modified to read some other file formats.  */
+
+#include <a.out.h>
+#include <elf.h>
+#include <error.h>
+#include <libintl.h>
+#include <link.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <gnu/lib-names.h>
+
+#include <ldconfig.h>
+
+#define Elf32_CLASS ELFCLASS32
+#define Elf64_CLASS ELFCLASS64
+
+struct known_names
+{
+  const char *soname;
+  int flag;
+};
+
+static struct known_names interpreters[] =
+{
+  { "/lib/" LD_SO, FLAG_ELF_LIBC6 },
+#ifdef SYSDEP_KNOWN_INTERPRETER_NAMES
+  SYSDEP_KNOWN_INTERPRETER_NAMES
+#endif
+};
+
+static struct known_names known_libs[] =
+{
+  { LIBC_SO, FLAG_ELF_LIBC6 },
+  { LIBM_SO, FLAG_ELF_LIBC6 },
+#ifdef SYSDEP_KNOWN_LIBRARY_NAMES
+  SYSDEP_KNOWN_LIBRARY_NAMES
+#endif
+};
+
+
+/* Check if string corresponds to a GDB Python file.  */
+static bool
+is_gdb_python_file (const char *name)
+{
+  size_t len = strlen (name);
+  return len > 7 && strcmp (name + len - 7, "-gdb.py") == 0;
+}
+
+/* Returns 0 if everything is ok, != 0 in case of error.  */
+int
+process_file (const char *real_file_name, const char *file_name,
+	      const char *lib, int *flag, unsigned int *osversion,
+	      char **soname, int is_link, struct stat64 *stat_buf)
+{
+  FILE *file;
+  struct stat64 statbuf;
+  void *file_contents;
+  int ret;
+  ElfW(Ehdr) *elf_header;
+  struct exec *aout_header;
+
+  ret = 0;
+  *flag = FLAG_ANY;
+  *soname = NULL;
+
+  file = fopen (real_file_name, "rb");
+  if (file == NULL)
+    {
+      /* No error for stale symlink.  */
+      if (is_link && strstr (file_name, ".so") != NULL)
+	return 1;
+      error (0, 0, _("Input file %s not found.\n"), file_name);
+      return 1;
+    }
+
+  if (fstat64 (fileno (file), &statbuf) < 0)
+    {
+      error (0, 0, _("Cannot fstat file %s.\n"), file_name);
+      fclose (file);
+      return 1;
+    }
+
+  /* Check that the file is large enough so that we can access the
+     information.  We're only checking the size of the headers here.  */
+  if ((size_t) statbuf.st_size < sizeof (struct exec)
+      || (size_t) statbuf.st_size < sizeof (ElfW(Ehdr)))
+    {
+      if (statbuf.st_size == 0)
+	error (0, 0, _("File %s is empty, not checked."), file_name);
+      else
+	{
+	  char buf[SELFMAG];
+	  size_t n = MIN (statbuf.st_size, SELFMAG);
+	  if (fread (buf, n, 1, file) == 1 && memcmp (buf, ELFMAG, n) == 0)
+	    error (0, 0, _("File %s is too small, not checked."), file_name);
+	}
+      fclose (file);
+      return 1;
+    }
+
+  file_contents = mmap (0, statbuf.st_size, PROT_READ, MAP_SHARED,
+			fileno (file), 0);
+  if (file_contents == MAP_FAILED)
+    {
+      error (0, 0, _("Cannot mmap file %s.\n"), file_name);
+      fclose (file);
+      return 1;
+    }
+
+  /* First check if this is an aout file.  */
+  aout_header = (struct exec *) file_contents;
+  if (N_MAGIC (*aout_header) == ZMAGIC
+#ifdef QMAGIC			/* Linuxism.  */
+      || N_MAGIC (*aout_header) == QMAGIC
+#endif
+      )
+    {
+      /* Aout files don't have a soname, just return the name
+	 including the major number.  */
+      char *copy, *major, *dot;
+      copy = xstrdup (lib);
+      major = strstr (copy, ".so.");
+      if (major)
+	{
+	  dot = strstr (major + 4, ".");
+	  if (dot)
+	    *dot = '\0';
+	}
+      *soname = copy;
+      *flag = FLAG_LIBC4;
+      goto done;
+    }
+
+  elf_header = (ElfW(Ehdr) *) file_contents;
+  if (memcmp (elf_header->e_ident, ELFMAG, SELFMAG) != 0)
+    {
+      /* The file is neither ELF nor aout.  Check if it's a linker
+	 script, like libc.so - otherwise complain.  Only search the
+	 beginning of the file.  */
+      size_t len = MIN (statbuf.st_size, 512);
+      if (memmem (file_contents, len, "GROUP", 5) == NULL
+	  && memmem (file_contents, len, "GNU ld script", 13) == NULL
+	  && !is_gdb_python_file (file_name))
+	error (0, 0, _("%s is not an ELF file - it has the wrong magic bytes at the start.\n"),
+	       file_name);
+      ret = 1;
+    }
+  /* Libraries have to be shared object files.  */
+  else if (elf_header->e_type != ET_DYN)
+    ret = 1;
+  else if (process_elf_file (file_name, lib, flag, osversion, soname,
+			     file_contents, statbuf.st_size))
+    ret = 1;
+
+ done:
+  /* Clean up allocated memory and resources.  */
+  munmap (file_contents, statbuf.st_size);
+  fclose (file);
+
+  *stat_buf = statbuf;
+  return ret;
+}
+
+/* Returns made up soname if lib doesn't have explicit DT_SONAME.  */
+
+char *
+implicit_soname (const char *lib, int flag)
+{
+  char *soname = xstrdup (lib);
+
+  if ((flag & FLAG_TYPE_MASK) != FLAG_LIBC4)
+    return soname;
+
+  /* Aout files don't have a soname, just return the name
+     including the major number.  */
+  char *major = strstr (soname, ".so.");
+  if (major)
+    {
+      char *dot = strstr (major + 4, ".");
+      if (dot)
+	*dot = '\0';
+    }
+  return soname;
+}
+
+/* Get architecture specific version of process_elf_file.  */
+#include <readelflib.c>