1 files changed, 77 insertions, 0 deletions
diff --git a/src/rtld/dl-hash.h b/src/rtld/dl-hash.h
new file mode 100644
index 0000000..2b1f0b7
--- /dev/null
+++ b/src/rtld/dl-hash.h
@@ -0,0 +1,77 @@
+/* glibc-2.22: sysdeps/generic/dl-hash.h */
+
+/* Compute hash value for given string according to ELF standard.
+   Copyright (C) 1995-2015 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/>.  */
+
+#ifndef _DL_HASH_H
+#define _DL_HASH_H	1
+
+#define _dl_elf_hash rtld_elf_hash
+
+/* This is the hashing function specified by the ELF ABI.  In the
+   first five operations no overflow is possible so we optimized it a
+   bit.  */
+static unsigned int
+_dl_elf_hash (const char *name_arg)
+{
+  const unsigned char *name = (const unsigned char *) name_arg;
+  unsigned long int hash = *name;
+  if (hash != 0 && name[1] != '\0')
+    {
+      hash = (hash << 4) + name[1];
+      if (name[2] != '\0')
+	{
+	  hash = (hash << 4) + name[2];
+	  if (name[3] != '\0')
+	    {
+	      hash = (hash << 4) + name[3];
+	      if (name[4] != '\0')
+		{
+		  hash = (hash << 4) + name[4];
+		  name += 5;
+		  while (*name != '\0')
+		    {
+		      unsigned long int hi;
+		      hash = (hash << 4) + *name++;
+		      hi = hash & 0xf0000000;
+
+		      /* The algorithm specified in the ELF ABI is as
+			 follows:
+
+			 if (hi != 0)
+			   hash ^= hi >> 24;
+
+			 hash &= ~hi;
+
+			 But the following is equivalent and a lot
+			 faster, especially on modern processors.  */
+
+		      hash ^= hi >> 24;
+		    }
+
+		  /* Second part of the modified formula.  This
+		     operation can be lifted outside the loop.  */
+		  hash &= 0x0fffffff;
+		}
+	    }
+	}
+    }
+  return hash;
+}
+
+#endif /* dl-hash.h */