ld.so: Implement the --list-diagnostics option

1 files changed, 77 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/dl-diagnostics-kernel.c b/sysdeps/unix/sysv/linux/dl-diagnostics-kernel.c
new file mode 100644
index 0000000000..59f6402c54
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/dl-diagnostics-kernel.c
@@ -0,0 +1,77 @@
+/* Print kernel diagnostics data in ld.so.  Linux version.
+   Copyright (C) 2021 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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <dl-diagnostics.h>
+#include <ldsodefs.h>
+#include <sys/utsname.h>
+
+/* Dump the auxiliary vector to standard output.  */
+static void
+print_auxv (void)
+{
+  /* See _dl_show_auxv.  The code below follows the general output
+     format for diagnostic dumps.  */
+  unsigned int index = 0;
+  for (ElfW(auxv_t) *av = GLRO(dl_auxv); av->a_type != AT_NULL; ++av)
+    {
+      _dl_printf ("auxv[0x%x].a_type=0x%lx\n"
+                  "auxv[0x%x].a_val=",
+                  index, (unsigned long int) av->a_type, index);
+      if (av->a_type == AT_EXECFN
+          || av->a_type == AT_PLATFORM
+          || av->a_type == AT_BASE_PLATFORM)
+        /* The address of the strings is not useful at all, so print
+           the strings themselvs.  */
+        _dl_diagnostics_print_string ((const char *) av->a_un.a_val);
+      else
+        _dl_printf ("0x%lx", (unsigned long int) av->a_un.a_val);
+      _dl_printf ("\n");
+      ++index;
+    }
+}
+
+/* Print one uname entry.  */
+static void
+print_utsname_entry (const char *field, const char *value)
+{
+  _dl_printf ("uname.");
+  _dl_diagnostics_print_labeled_string (field, value);
+}
+
+/* Print information from uname, including the kernel version.  */
+static void
+print_uname (void)
+{
+  struct utsname uts;
+  if (__uname (&uts) == 0)
+    {
+      print_utsname_entry ("sysname", uts.sysname);
+      print_utsname_entry ("nodename", uts.nodename);
+      print_utsname_entry ("release", uts.release);
+      print_utsname_entry ("version", uts.version);
+      print_utsname_entry ("machine", uts.machine);
+      print_utsname_entry ("domainname", uts.domainname);
+    }
+}
+
+void
+_dl_diagnostics_kernel (void)
+{
+  print_auxv ();
+  print_uname ();
+}