1 /*
2 * memchr test.
3 *
4 * Copyright (c) 2020, Arm Limited.
5 * SPDX-License-Identifier: MIT
6 */
7
8 #ifndef _GNU_SOURCE
9 #define _GNU_SOURCE
10 #endif
11
12 #include <stdint.h>
13 #include <stdio.h>
14 #include <stdlib.h>
15 #include <string.h>
16 #include <limits.h>
17 #include "mte.h"
18 #include "stringlib.h"
19 #include "stringtest.h"
20
21 #define F(x, mte) {#x, x, mte},
22
23 static const struct fun
24 {
25 const char *name;
26 void *(*fun) (const void *s, int c, size_t n);
27 int test_mte;
28 } funtab[] = {
29 // clang-format off
30 F(memrchr, 0)
31 #if __aarch64__
32 F(__memrchr_aarch64, 1)
33 #endif
34 {0, 0, 0}
35 // clang-format on
36 };
37 #undef F
38
39 #define ALIGN 32
40 #define LEN 512
41 static char *sbuf;
42
43 static void *
alignup(void * p)44 alignup (void *p)
45 {
46 return (void *) (((uintptr_t) p + ALIGN) & -ALIGN);
47 }
48
49 static void
test(const struct fun * fun,int align,size_t seekpos,size_t len,size_t maxlen)50 test (const struct fun *fun, int align, size_t seekpos, size_t len,
51 size_t maxlen)
52 {
53 char *src = alignup (sbuf);
54 char *s = src + align;
55 char *f = seekpos < maxlen ? s + seekpos : NULL;
56 int seekchar = 1;
57 void *p;
58
59 if (err_count >= ERR_LIMIT)
60 return;
61 if (len > LEN || seekpos > LEN || align > ALIGN)
62 abort ();
63
64 for (int i = 0; src + i < s; i++)
65 src[i] = seekchar;
66 for (int i = 0; i <= ALIGN; i++)
67 s[len + i] = seekchar;
68 for (int i = 0; i < len; i++)
69 s[i] = 'a' + (i & 31);
70 s[seekpos] = seekchar;
71 s[((len ^ align) & 1) && seekpos < maxlen ? seekpos - 1 : len] = seekchar;
72
73 s = tag_buffer (s, maxlen, fun->test_mte);
74 p = fun->fun (s, seekchar, maxlen);
75 untag_buffer (s, maxlen, fun->test_mte);
76 p = untag_pointer (p);
77
78 if (p != f)
79 {
80 ERR ("%s (%p, 0x%02x, %zu) returned %p, expected %p\n", fun->name, s,
81 seekchar, maxlen, p, f);
82 quote ("input", s, len);
83 }
84 }
85
86 int
main(void)87 main (void)
88 {
89 sbuf = mte_mmap (LEN + 3 * ALIGN);
90 int r = 0;
91 for (int i = 0; funtab[i].name; i++)
92 {
93 err_count = 0;
94 for (int a = 0; a < ALIGN; a++)
95 for (int n = 0; n < LEN; n++)
96 {
97 for (int sp = 0; sp < LEN; sp++)
98 test (funtab + i, a, sp, n, n);
99 }
100 char *pass = funtab[i].test_mte && mte_enabled () ? "MTE PASS" : "PASS";
101 printf ("%s %s\n", err_count ? "FAIL" : pass, funtab[i].name);
102 if (err_count)
103 r = -1;
104 }
105 return r;
106 }
107