1 /*
2 * strncmp test.
3 *
4 * Copyright (c) 2019-2020, Arm Limited.
5 * SPDX-License-Identifier: MIT
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
18 static const struct fun
19 {
20 const char *name;
21 int (*fun) (const char *, const char *, size_t);
22 int test_mte;
23 } funtab[] = {
24 // clang-format off
25 F(strncmp, 0)
26 #if __aarch64__
27 F(__strncmp_aarch64, 0)
28 F(__strncmp_aarch64_mte, 1)
29 # if __ARM_FEATURE_SVE
30 F(__strncmp_aarch64_sve, 1)
31 # endif
32 #endif
33 {0, 0, 0}
34 // clang-format on
35 };
36 #undef F
37
38 #define A 32
39 #define LEN 250000
40 static char *s1buf;
41 static char *s2buf;
42
43 static void *
alignup(void * p)44 alignup (void *p)
45 {
46 return (void *) (((uintptr_t) p + A - 1) & -A);
47 }
48
49 static void
test(const struct fun * fun,int s1align,int s2align,int maxlen,int diffpos,int len,int delta)50 test (const struct fun *fun, int s1align, int s2align, int maxlen, int diffpos,
51 int len, int delta)
52 {
53 char *src1 = alignup (s1buf);
54 char *src2 = alignup (s2buf);
55 char *s1 = src1 + s1align;
56 char *s2 = src2 + s2align;
57 int r;
58
59 if (err_count >= ERR_LIMIT)
60 return;
61 if (len > LEN || s1align >= A || s2align >= A)
62 abort ();
63 if (diffpos >= len)
64 abort ();
65 if ((diffpos < 0) != (delta == 0))
66 abort ();
67
68 for (int i = 0; i < len + A; i++)
69 src1[i] = src2[i] = '?';
70 for (int i = 0; i < len; i++)
71 s1[i] = s2[i] = 'a' + i % 23;
72 if (delta)
73 s1[diffpos] += delta;
74 s1[len] = s2[len] = '\0';
75
76 size_t mte_len = maxlen < len + 1 ? maxlen : len + 1;
77 s1 = tag_buffer (s1, mte_len, fun->test_mte);
78 s2 = tag_buffer (s2, mte_len, fun->test_mte);
79 r = fun->fun (s1, s2, maxlen);
80 untag_buffer (s1, mte_len, fun->test_mte);
81 untag_buffer (s2, mte_len, fun->test_mte);
82
83 if (diffpos >= maxlen)
84 {
85 diffpos = -1;
86 delta = 0;
87 }
88 if ((delta == 0 && r != 0) || (delta > 0 && r <= 0) || (delta < 0 && r >= 0))
89 {
90 ERR (
91 "%s(align %d, align %d, %d) (len=%d, diffpos=%d) failed, returned %d\n",
92 fun->name, s1align, s2align, maxlen, len, diffpos, r);
93 quoteat ("src1", src1, len + A, diffpos);
94 quoteat ("src2", src2, len + A, diffpos);
95 }
96 }
97
98 int
main()99 main ()
100 {
101 s1buf = mte_mmap (LEN + 2 * A + 1);
102 s2buf = mte_mmap (LEN + 2 * A + 1);
103 int r = 0;
104 for (int i = 0; funtab[i].name; i++)
105 {
106 err_count = 0;
107 for (int d = 0; d < A; d++)
108 for (int s = 0; s < A; s++)
109 {
110 int n;
111 test (funtab + i, d, s, 0, -1, 0, 0);
112 test (funtab + i, d, s, 1, -1, 0, 0);
113 test (funtab + i, d, s, 0, -1, 1, 0);
114 test (funtab + i, d, s, 1, -1, 1, 0);
115 test (funtab + i, d, s, 2, -1, 1, 0);
116 test (funtab + i, d, s, 1, 0, 1, 1);
117 test (funtab + i, d, s, 1, 0, 1, -1);
118 for (n = 2; n < 100; n++)
119 {
120 test (funtab + i, d, s, n, -1, n, 0);
121 test (funtab + i, d, s, n, n / 2, n, 1);
122 test (funtab + i, d, s, n / 2, -1, n, 0);
123 test (funtab + i, d, s, n / 2, n / 2, n, -1);
124 }
125 for (; n < LEN; n *= 2)
126 {
127 test (funtab + i, d, s, n, -1, n, 0);
128 test (funtab + i, d, s, n, n / 2, n, -1);
129 test (funtab + i, d, s, n / 2, -1, n, 0);
130 test (funtab + i, d, s, n / 2, n / 2, n, 1);
131 }
132 }
133 char *pass = funtab[i].test_mte && mte_enabled () ? "MTE PASS" : "PASS";
134 printf ("%s %s\n", err_count ? "FAIL" : pass, funtab[i].name);
135 if (err_count)
136 r = -1;
137 }
138 return r;
139 }
140