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dff8da6b | 1 | /* Copyright (C) 2003-2024 Free Software Foundation, Inc. |
79b0a335 | 2 | This file is part of the GNU C Library. |
79b0a335 UD |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
79b0a335 UD |
17 | |
18 | #include <errno.h> | |
19 | #include <error.h> | |
20 | #include <limits.h> | |
21 | #include <pthread.h> | |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
24 | #include <ucontext.h> | |
5d98a7da | 25 | #include <support/support.h> |
79b0a335 | 26 | |
79b0a335 | 27 | #define N 4 |
72e61500 UD |
28 | #if __WORDSIZE == 64 |
29 | #define GUARD_PATTERN 0xdeadbeafdeadbeaf | |
30 | #else | |
31 | #define GUARD_PATTERN 0xdeadbeaf | |
32 | #endif | |
33 | ||
34 | typedef struct { | |
35 | ucontext_t uctx; | |
36 | unsigned long guard[3]; | |
37 | } tst_context_t; | |
79b0a335 | 38 | |
5d98a7da L |
39 | static char *stacks[N]; |
40 | static size_t stack_size; | |
72e61500 | 41 | static tst_context_t ctx[N][2]; |
79b0a335 UD |
42 | static volatile int failures; |
43 | ||
44 | ||
45 | static void | |
46 | fct (long int n) | |
47 | { | |
e6eb894e UD |
48 | char on_stack[1]; |
49 | ||
79b0a335 | 50 | /* Just to use the thread local descriptor. */ |
e6eb894e | 51 | printf ("%ld: in %s now, on_stack = %p\n", n, __FUNCTION__, on_stack); |
79b0a335 | 52 | errno = 0; |
e6eb894e | 53 | |
72e61500 UD |
54 | if (ctx[n][1].uctx.uc_link != &ctx[n][0].uctx) |
55 | { | |
56 | printf ("context[%ld][1] uc_link damaged, = %p\n", n, | |
57 | ctx[n][1].uctx.uc_link); | |
58 | exit (1); | |
59 | } | |
60 | ||
61 | if ((ctx[n][0].guard[0] != GUARD_PATTERN) | |
62 | || (ctx[n][0].guard[1] != GUARD_PATTERN) | |
63 | || (ctx[n][0].guard[2] != GUARD_PATTERN)) | |
64 | { | |
65 | printf ("%ld: %s context[0] overflow detected!\n", n, __FUNCTION__); | |
66 | ++failures; | |
67 | } | |
68 | ||
69 | if ((ctx[n][1].guard[0] != GUARD_PATTERN) | |
70 | || (ctx[n][1].guard[1] != GUARD_PATTERN) | |
71 | || (ctx[n][1].guard[2] != GUARD_PATTERN)) | |
72 | { | |
73 | printf ("%ld: %s context[1] overflow detected!\n", n, __FUNCTION__); | |
74 | ++failures; | |
75 | } | |
76 | ||
e6eb894e UD |
77 | if (n < 0 || n >= N) |
78 | { | |
79 | printf ("%ld out of range\n", n); | |
80 | exit (1); | |
81 | } | |
82 | ||
5d98a7da | 83 | if (on_stack < stacks[n] || on_stack >= stacks[n] + stack_size) |
e6eb894e UD |
84 | { |
85 | printf ("%ld: on_stack not on appropriate stack\n", n); | |
86 | exit (1); | |
87 | } | |
79b0a335 UD |
88 | } |
89 | ||
90 | ||
91 | static void * | |
92 | tf (void *arg) | |
93 | { | |
94 | int n = (int) (long int) arg; | |
95 | ||
72e61500 UD |
96 | ctx[n][0].guard[0] = GUARD_PATTERN; |
97 | ctx[n][0].guard[1] = GUARD_PATTERN; | |
98 | ctx[n][0].guard[2] = GUARD_PATTERN; | |
99 | ||
100 | ctx[n][1].guard[0] = GUARD_PATTERN; | |
101 | ctx[n][1].guard[1] = GUARD_PATTERN; | |
102 | ctx[n][1].guard[2] = GUARD_PATTERN; | |
103 | ||
104 | if (getcontext (&ctx[n][1].uctx) != 0) | |
79b0a335 UD |
105 | { |
106 | printf ("%d: cannot get context: %m\n", n); | |
107 | exit (1); | |
108 | } | |
109 | ||
110 | printf ("%d: %s: before makecontext\n", n, __FUNCTION__); | |
111 | ||
72e61500 | 112 | ctx[n][1].uctx.uc_stack.ss_sp = stacks[n]; |
5d98a7da | 113 | ctx[n][1].uctx.uc_stack.ss_size = stack_size; |
72e61500 UD |
114 | ctx[n][1].uctx.uc_link = &ctx[n][0].uctx; |
115 | makecontext (&ctx[n][1].uctx, (void (*) (void)) fct, 1, (long int) n); | |
79b0a335 UD |
116 | |
117 | printf ("%d: %s: before swapcontext\n", n, __FUNCTION__); | |
118 | ||
72e61500 | 119 | if (swapcontext (&ctx[n][0].uctx, &ctx[n][1].uctx) != 0) |
79b0a335 UD |
120 | { |
121 | ++failures; | |
122 | printf ("%d: %s: swapcontext failed\n", n, __FUNCTION__); | |
123 | } | |
124 | else | |
125 | printf ("%d: back in %s\n", n, __FUNCTION__); | |
126 | ||
127 | return NULL; | |
128 | } | |
129 | ||
130 | ||
131 | static volatile int global; | |
132 | ||
133 | ||
134 | static int | |
135 | do_test (void) | |
136 | { | |
137 | int n; | |
138 | pthread_t th[N]; | |
139 | ucontext_t mctx; | |
140 | ||
5d98a7da L |
141 | stack_size = 2 * PTHREAD_STACK_MIN; |
142 | for (int i = 0; i < N; i++) | |
143 | stacks[i] = xmalloc (stack_size); | |
144 | ||
79b0a335 UD |
145 | puts ("making contexts"); |
146 | if (getcontext (&mctx) != 0) | |
147 | { | |
148 | if (errno == ENOSYS) | |
149 | { | |
150 | puts ("context handling not supported"); | |
151 | exit (0); | |
152 | } | |
153 | ||
154 | printf ("%s: getcontext: %m\n", __FUNCTION__); | |
155 | exit (1); | |
156 | } | |
157 | ||
158 | /* Play some tricks with this context. */ | |
159 | if (++global == 1) | |
160 | if (setcontext (&mctx) != 0) | |
161 | { | |
162 | puts ("setcontext failed"); | |
163 | exit (1); | |
164 | } | |
165 | if (global != 2) | |
166 | { | |
167 | puts ("global not incremented twice"); | |
168 | exit (1); | |
169 | } | |
170 | puts ("global OK"); | |
171 | ||
4d1a02ef UD |
172 | pthread_attr_t at; |
173 | ||
174 | if (pthread_attr_init (&at) != 0) | |
175 | { | |
176 | puts ("attr_init failed"); | |
177 | return 1; | |
178 | } | |
179 | ||
180 | if (pthread_attr_setstacksize (&at, 1 * 1024 * 1024) != 0) | |
181 | { | |
182 | puts ("attr_setstacksize failed"); | |
183 | return 1; | |
184 | } | |
185 | ||
79b0a335 | 186 | for (n = 0; n < N; ++n) |
4d1a02ef | 187 | if (pthread_create (&th[n], &at, tf, (void *) (long int) n) != 0) |
79b0a335 UD |
188 | { |
189 | puts ("create failed"); | |
190 | exit (1); | |
191 | } | |
192 | ||
4d1a02ef UD |
193 | if (pthread_attr_destroy (&at) != 0) |
194 | { | |
195 | puts ("attr_destroy failed"); | |
196 | return 1; | |
197 | } | |
198 | ||
79b0a335 UD |
199 | for (n = 0; n < N; ++n) |
200 | if (pthread_join (th[n], NULL) != 0) | |
201 | { | |
202 | puts ("join failed"); | |
203 | exit (1); | |
204 | } | |
205 | ||
5d98a7da L |
206 | for (int i = 0; i < N; i++) |
207 | free (stacks[i]); | |
208 | ||
79b0a335 UD |
209 | return failures; |
210 | } | |
211 | ||
212 | #define TEST_FUNCTION do_test () | |
213 | #include "../test-skeleton.c" |