1 /*-
2 * Copyright (c) 2023 The FreeBSD Foundation
3 *
4 * This software was developed by Robert Clausecker <fuz@FreeBSD.org>
5 * under sponsorship from the FreeBSD Foundation.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ''AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE
27 */
28
29 #include <sys/cdefs.h>
30
31 #include <atf-c.h>
32 #include <dlfcn.h>
33 #include <string.h>
34
35 int (*volatile strcmp_fn)(const char *, const char *);
36
37 ATF_TC(strcmp_alignments);
ATF_TC_HEAD(strcmp_alignments,tc)38 ATF_TC_HEAD(strcmp_alignments, tc)
39 {
40 atf_tc_set_md_var(tc, "descr", "Test strcmp(3) with various alignments");
41 }
42
43 static void
alignment_testcase(char * a,char * b,int want)44 alignment_testcase(char *a, char *b, int want)
45 {
46 int res;
47
48 res = strcmp_fn(a, b);
49 ATF_CHECK_MSG(want == (res > 0) - (res < 0),
50 "strcmp(%p \"%s\", %p \"%s\") = %d != %d",
51 (void *)a, a, (void *)b, b, res, want);
52 }
53
54 static void
check_strcmp_alignments(char a[],char b[],size_t a_off,size_t b_off,size_t len,size_t pos)55 check_strcmp_alignments(char a[], char b[],
56 size_t a_off, size_t b_off, size_t len, size_t pos)
57 {
58 char *a_str, *b_str, a_orig, b_orig;
59
60 a[a_off] = '\0';
61 b[b_off] = '\0';
62
63 a_str = a + a_off + 1;
64 b_str = b + b_off + 1;
65
66 a_str[len] = '\0';
67 b_str[len] = '\0';
68 a_str[len+1] = 'A';
69 b_str[len+1] = 'B';
70
71 a_orig = a_str[pos];
72 b_orig = b_str[pos];
73
74 alignment_testcase(a_str, b_str, 0);
75
76 if (pos < len) {
77 a_str[pos] = '\0';
78 alignment_testcase(a_str, b_str, -1);
79 a_str[pos] = a_orig;
80 b_str[pos] = '\0';
81 alignment_testcase(a_str, b_str, 1);
82 b_str[pos] = b_orig;
83 }
84
85 a_str[pos] = 'X';
86 alignment_testcase(a_str, b_str, 1);
87 a_str[pos] = a_orig;
88 b_str[pos] = 'X';
89 alignment_testcase(a_str, b_str, -1);
90 b_str[pos] = b_orig;
91
92 a[a_off] = '-';
93 b[b_off] = '-';
94 a_str[len] = '-';
95 b_str[len] = '-';
96 a_str[len+1] = '-';
97 b_str[len+1] = '-';
98 }
99
ATF_TC_BODY(strcmp_alignments,tc)100 ATF_TC_BODY(strcmp_alignments, tc)
101 {
102 size_t a_off, b_off, len, pos;
103 /* 16B alignment offset + 64B buffer + sentinel before/after + NUL */
104 char a[64+16+3], b[64+16+3];
105
106 memset(a, '-', sizeof(a));
107 memset(b, '-', sizeof(b));
108 a[sizeof(a) - 1] = '\0';
109 b[sizeof(b) - 1] = '\0';
110
111 /* check alignment offsets relevant for SSE routines */
112 for (a_off = 0; a_off < 16; a_off++)
113 for (b_off = 0; b_off < 16; b_off++)
114 /* ensure main loop (@ 32B) is completed at least once */
115 for (len = 1; len <= 64; len++)
116 for (pos = 0; pos <= len; pos++)
117 check_strcmp_alignments(a, b, a_off, b_off, len, pos);
118 }
119
ATF_TP_ADD_TCS(tp)120 ATF_TP_ADD_TCS(tp)
121 {
122 void *dl_handle;
123
124 dl_handle = dlopen(NULL, RTLD_LAZY);
125 strcmp_fn = dlsym(dl_handle, "test_strcmp");
126 if (strcmp_fn == NULL)
127 strcmp_fn = strcmp;
128
129 ATF_TP_ADD_TC(tp, strcmp_alignments);
130
131 return atf_no_error();
132 }
133