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-rw-r--r--elf/Makefile1
-rw-r--r--elf/simple-dl-hash.h42
-rw-r--r--elf/tst-dl-hash.c115
3 files changed, 158 insertions, 0 deletions
diff --git a/elf/Makefile b/elf/Makefile
index 6f4ea78007..838fe39afb 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -312,6 +312,7 @@ tests := \
tst-array4 \
tst-array5 \
tst-auxv \
+ tst-dl-hash \
tst-leaks1 \
tst-stringtable \
tst-tls9 \
diff --git a/elf/simple-dl-hash.h b/elf/simple-dl-hash.h
new file mode 100644
index 0000000000..53702b3c55
--- /dev/null
+++ b/elf/simple-dl-hash.h
@@ -0,0 +1,42 @@
+/* __simple_dl_elf_hash for testing true elf symbol lookup.
+ 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/>. */
+
+#ifndef _SIMPLE_DL_ELF_HASH_H
+#define _SIMPLE_DL_ELF_HASH_H 1
+
+#include <stdint.h>
+
+/* For testing/benchmarking purposes. Real implementation in
+ sysdeps/generic/dl-hash.h. */
+static uint32_t
+__attribute__ ((unused))
+__simple_dl_elf_hash (const char *name_arg)
+{
+ unsigned long int hash = 0;
+ for (unsigned char c = *name_arg; c != '\0'; c = *(++name_arg))
+ {
+ unsigned long int hi;
+ hash = (hash << 4) + c;
+ hi = hash & 0xf0000000;
+ hash ^= hi >> 24;
+ hash &= 0x0fffffff;
+ }
+ return hash;
+}
+
+#endif /* simple-dl-hash.h */
diff --git a/elf/tst-dl-hash.c b/elf/tst-dl-hash.c
new file mode 100644
index 0000000000..8697eb73a0
--- /dev/null
+++ b/elf/tst-dl-hash.c
@@ -0,0 +1,115 @@
+/* Test dl-hash functions.
+ 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/>. */
+
+
+#include <simple-dl-hash.h>
+#include <dl-hash.h>
+#include <dl-new-hash.h>
+#include <support/support.h>
+#include <support/check.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+typedef unsigned int (*hash_f) (const char *);
+
+
+
+static int
+do_fill_test (size_t len, int fill, const char *name, hash_f testf,
+ hash_f expecf)
+{
+ uint32_t expec, res;
+ char buf[len + 1];
+ memset (buf, fill, len);
+ buf[len] = '\0';
+
+ expec = expecf (buf);
+ res = testf (buf);
+ if (expec != res)
+ FAIL_EXIT1 ("FAIL: fill(%d) %s(%zu), %x != %x\n", fill, name, len, expec,
+ res);
+
+ return 0;
+}
+
+static int
+do_fill_tests (size_t len, int fill)
+{
+ if (do_fill_test (len, fill, "dl_new_hash", &_dl_new_hash,
+ &__simple_dl_new_hash))
+ return 1;
+
+ return do_fill_test (len, fill, "dl_elf_hash", &_dl_elf_hash,
+ &__simple_dl_elf_hash);
+}
+
+static int
+do_rand_test (size_t len, const char *name, hash_f testf, hash_f expecf)
+{
+ uint32_t expec, res;
+ size_t i;
+ char buf[len + 1];
+ char v;
+ for (i = 0; i < len; ++i)
+ {
+ v = random ();
+ if (v == 0)
+ v = 1;
+
+ buf[i] = v;
+ }
+ buf[len] = '\0';
+
+ expec = expecf (buf);
+ res = testf (buf);
+ if (expec != res)
+ FAIL_EXIT1 ("FAIL: random %s(%zu), %x != %x\n", name, len, expec, res);
+
+ return 0;
+}
+
+static int
+do_rand_tests (size_t len)
+{
+ if (do_rand_test (len, "dl_new_hash", &_dl_new_hash, &__simple_dl_new_hash))
+ return 1;
+
+ return do_rand_test (len, "dl_elf_hash", &_dl_elf_hash, &__simple_dl_elf_hash);
+}
+
+static int
+do_test (void)
+{
+ size_t i, j;
+ for (i = 0; i < 100; ++i)
+ {
+ for (j = 0; j < 8192; ++j)
+ {
+ if (do_rand_tests (i))
+ return 1;
+
+ if (do_fill_tests (i, -1) || do_fill_tests (i, 1)
+ || do_fill_tests (i, 0x80) || do_fill_tests (i, 0x88))
+ return 1;
+ }
+ }
+ return 0;
+}
+
+#include <support/test-driver.c>