elf: Add <dl-r_debug.h>

Add <dl-r_debug.h> to get the adddress of the r_debug structure after
relocation and its offset before relocation from the PT_DYNAMIC segment
to support DT_DEBUG, DT_MIPS_RLD_MAP_REL and DT_MIPS_RLD_MAP.

Co-developed-by: Xi Ruoyao <xry111@mengyan1223.wang>

1 files changed, 36 insertions, 0 deletions

diff --git a/sysdeps/generic/dl-r_debug.h b/sysdeps/generic/dl-r_debug.h
new file mode 100644
index 0000000000..e3edeb4f06
--- /dev/null
+++ b/sysdeps/generic/dl-r_debug.h
@@ -0,0 +1,36 @@
+/* Function to access r_debug structure.  Generic version.
+   Copyright (C) 2022 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/>.  */
+
+/* Return the address of the struct r_debug after relocation.  */
+
+static inline EW(Addr)
+E(r_debug_address) (EW(Dyn) *d)
+{
+  if (d->d_tag == DT_DEBUG)
+    return (EW(Addr)) d->d_un.d_ptr;
+
+  return 0;
+}
+
+/* Return the offset of the struct r_debug before relocation.  */
+
+static inline EW(Addr)
+E(r_debug_offset) (EW(Dyn) *d, int fd, EW(Addr) offset)
+{
+  return E(r_debug_address) (d);
+}