1/*
2 * strcmp test.
3 *
4 * Copyright (c) 2019-2022, 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 char *s1, const char *s2);
22  int test_mte;
23} funtab[] = {
24  // clang-format off
25  F(strcmp, 0)
26#if __aarch64__
27  F(__strcmp_aarch64, 1)
28# if __ARM_FEATURE_SVE
29  F(__strcmp_aarch64_sve, 1)
30# endif
31#elif __arm__
32# if __ARM_ARCH >= 7 && __ARM_ARCH_ISA_ARM >= 1
33  F(__strcmp_arm, 0)
34# elif __ARM_ARCH == 6 && __ARM_ARCH_6M__ >= 1
35  F(__strcmp_armv6m, 0)
36# endif
37#endif
38  {0, 0, 0}
39  // clang-format on
40};
41#undef F
42
43#define A 32
44#define LEN 250000
45static char *s1buf;
46static char *s2buf;
47
48static void *
49alignup (void *p)
50{
51  return (void *) (((uintptr_t) p + A - 1) & -A);
52}
53
54static void
55test (const struct fun *fun, int s1align, int s2align, int len, int diffpos,
56      int delta)
57{
58  char *src1 = alignup (s1buf);
59  char *src2 = alignup (s2buf);
60  char *s1 = src1 + s1align;
61  char *s2 = src2 + s2align;
62  int r;
63
64  if (err_count >= ERR_LIMIT)
65    return;
66  if (len > LEN || s1align >= A || s2align >= A)
67    abort ();
68  if (diffpos >= len)
69    abort ();
70  if ((diffpos < 0) != (delta == 0))
71    abort ();
72
73  for (int i = 0; i < len + A; i++)
74    src1[i] = src2[i] = '?';
75  for (int i = 0; i < len; i++)
76    s1[i] = s2[i] = 'a' + i % 23;
77  if (delta)
78    s1[diffpos] += delta;
79  s1[len] = s2[len] = '\0';
80
81  s1 = tag_buffer (s1, len + 1, fun->test_mte);
82  s2 = tag_buffer (s2, len + 1, fun->test_mte);
83  r = fun->fun (s1, s2);
84  untag_buffer (s1, len + 1, fun->test_mte);
85  untag_buffer (s2, len + 1, fun->test_mte);
86
87  if ((delta == 0 && r != 0) || (delta > 0 && r <= 0) || (delta < 0 && r >= 0))
88    {
89      ERR ("%s(align %d, align %d, %d) failed, returned %d\n", fun->name,
90	   s1align, s2align, len, r);
91      quoteat ("src1", src1, len + A, diffpos);
92      quoteat ("src2", src2, len + A, diffpos);
93    }
94}
95
96int
97main ()
98{
99  s1buf = mte_mmap (LEN + 2 * A + 1);
100  s2buf = mte_mmap (LEN + 2 * A + 1);
101  int r = 0;
102  for (int i = 0; funtab[i].name; i++)
103    {
104      err_count = 0;
105      for (int d = 0; d < A; d++)
106	for (int s = 0; s < A; s++)
107	  {
108	    int n;
109	    test (funtab + i, d, s, 0, -1, 0);
110	    test (funtab + i, d, s, 1, -1, 0);
111	    test (funtab + i, d, s, 1, 0, 1);
112	    test (funtab + i, d, s, 1, 0, -1);
113	    for (n = 2; n < 100; n++)
114	      {
115		test (funtab + i, d, s, n, -1, 0);
116		test (funtab + i, d, s, n, n - 1, -1);
117		test (funtab + i, d, s, n, n / 2, 1);
118	      }
119	    for (; n < LEN; n *= 2)
120	      {
121		test (funtab + i, d, s, n, -1, 0);
122		test (funtab + i, d, s, n, n / 2, -1);
123	      }
124	  }
125      char *pass = funtab[i].test_mte && mte_enabled () ? "MTE PASS" : "PASS";
126      printf ("%s %s\n", err_count ? "FAIL" : pass, funtab[i].name);
127      if (err_count)
128	r = -1;
129    }
130  return r;
131}
132