diff --git a/tools/lsd/hash.c b/tools/lsd/hash.c
new file mode 100644
index 0000000..bbac675
--- /dev/null
+++ b/tools/lsd/hash.c
@@ -0,0 +1,29 @@
+#include <common.h>
+#include <debug.h>
+#include <libelf.h>
+#include <hash.h>
+#include <string.h>
+
+int hash_lookup(Elf *elf, 
+                Elf_Data *hash,
+                Elf_Data *symtab,
+                Elf_Data *symstr,
+                const char *symname)
+{
+    Elf32_Word *hash_data = (Elf32_Word *)hash->d_buf;
+    Elf32_Word index;
+    Elf32_Word nbuckets = *hash_data++;
+    Elf32_Word *buckets = ++hash_data;
+    Elf32_Word *chains  = hash_data + nbuckets;
+
+    index = buckets[elf_hash(symname) % nbuckets];
+    while(index != STN_UNDEF &&
+          strcmp((char *)symstr->d_buf + 
+                 ((Elf32_Sym *)symtab->d_buf)[index].st_name,
+                 symname))
+    {
+        index = chains[index];
+    }
+
+    return index;
+}