1/*
2 * memcmp test.
3 *
4 * Copyright (c) 2019-2020, Arm Limited.
5 * SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception
6 */
7
8#include <stdint.h>
9#include <stdio.h>
10#include <stdlib.h>
11#include <string.h>
12#include "mte.h"
13#include "stringlib.h"
14#include "stringtest.h"
15
16#define F(x, mte) {#x, x, mte},
17
18static const struct fun
19{
20  const char *name;
21  int (*fun) (const void *s1, const void *s2, size_t n);
22  int test_mte;
23} funtab[] = {
24  // clang-format off
25  F(memcmp, 0)
26#if __aarch64__
27  F(__memcmp_aarch64, 1)
28# if __ARM_FEATURE_SVE
29  F(__memcmp_aarch64_sve, 1)
30# endif
31#endif
32  {0, 0, 0}
33  // clang-format on
34};
35#undef F
36
37#define A 32
38#define LEN 250000
39static unsigned char *s1buf;
40static unsigned char *s2buf;
41
42static void *
43alignup (void *p)
44{
45  return (void *) (((uintptr_t) p + A - 1) & -A);
46}
47
48static void
49test (const struct fun *fun, int s1align, int s2align, int len, int diffpos,
50      int delta)
51{
52  unsigned char *src1 = alignup (s1buf);
53  unsigned char *src2 = alignup (s2buf);
54  unsigned char *s1 = src1 + s1align;
55  unsigned char *s2 = src2 + s2align;
56  int r;
57
58  if (err_count >= ERR_LIMIT)
59    return;
60  if (len > LEN || s1align >= A || s2align >= A)
61    abort ();
62  if (diffpos >= len)
63    abort ();
64  if ((diffpos < 0) != (delta == 0))
65    abort ();
66
67  for (int i = 0; i < len + A; i++)
68    src1[i] = src2[i] = '?';
69  for (int i = 0; i < len; i++)
70    s1[i] = s2[i] = 'a' + i % 23;
71  if (delta)
72    s1[diffpos] += delta;
73
74  s1 = tag_buffer (s1, len, fun->test_mte);
75  s2 = tag_buffer (s2, len, fun->test_mte);
76  r = fun->fun (s1, s2, len);
77  untag_buffer (s1, len, fun->test_mte);
78  untag_buffer (s2, len, fun->test_mte);
79
80  if ((delta == 0 && r != 0) || (delta > 0 && r <= 0) || (delta < 0 && r >= 0))
81    {
82      ERR ("%s(align %d, align %d, %d) failed, returned %d\n", fun->name,
83	   s1align, s2align, len, r);
84      quoteat ("src1", src1, len + A, diffpos);
85      quoteat ("src2", src2, len + A, diffpos);
86    }
87}
88
89int
90main ()
91{
92  s1buf = mte_mmap (LEN + 2 * A);
93  s2buf = mte_mmap (LEN + 2 * A);
94  int r = 0;
95  for (int i = 0; funtab[i].name; i++)
96    {
97      err_count = 0;
98      for (int d = 0; d < A; d++)
99	for (int s = 0; s < A; s++)
100	  {
101	    int n;
102	    test (funtab + i, d, s, 0, -1, 0);
103	    test (funtab + i, d, s, 1, -1, 0);
104	    test (funtab + i, d, s, 1, 0, -1);
105	    test (funtab + i, d, s, 1, 0, 1);
106	    for (n = 2; n < 100; n++)
107	      {
108		test (funtab + i, d, s, n, -1, 0);
109		test (funtab + i, d, s, n, 0, -1);
110		test (funtab + i, d, s, n, n - 1, -1);
111		test (funtab + i, d, s, n, n / 2, 1);
112	      }
113	    for (; n < LEN; n *= 2)
114	      {
115		test (funtab + i, d, s, n, -1, 0);
116		test (funtab + i, d, s, n, n / 2, -1);
117	      }
118	  }
119      char *pass = funtab[i].test_mte && mte_enabled () ? "MTE PASS" : "PASS";
120      printf ("%s %s\n", err_count ? "FAIL" : pass, funtab[i].name);
121      if (err_count)
122	r = -1;
123    }
124  return r;
125}
126