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375a4844 | 1 | /* Check setcontext on the context from makecontext. |
581c785b | 2 | Copyright (C) 2018-2022 Free Software Foundation, Inc. |
375a4844 L |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
375a4844 L |
18 | |
19 | #include <stdio.h> | |
20 | #include <stdlib.h> | |
21 | #include <ucontext.h> | |
22 | #include <unistd.h> | |
23 | #include <stdatomic.h> | |
24 | ||
25 | static ucontext_t ctx[5]; | |
26 | static atomic_int done; | |
27 | ||
28 | static void | |
29 | __attribute__((noinline, noclone)) | |
30 | f2 (void) | |
31 | { | |
32 | done++; | |
33 | puts ("swap contexts in f2"); | |
34 | if (swapcontext (&ctx[4], &ctx[2]) != 0) | |
35 | { | |
36 | printf ("%s: setcontext: %m\n", __FUNCTION__); | |
37 | exit (EXIT_FAILURE); | |
38 | } | |
39 | puts ("end f2"); | |
40 | exit (done == 2 ? EXIT_SUCCESS : EXIT_FAILURE); | |
41 | } | |
42 | ||
43 | static void | |
791b350d | 44 | f1b (void) |
375a4844 | 45 | { |
375a4844 L |
46 | if (done) |
47 | { | |
791b350d | 48 | puts ("set context in f1b"); |
375a4844 L |
49 | if (setcontext (&ctx[3]) != 0) |
50 | { | |
51 | printf ("%s: setcontext: %m\n", __FUNCTION__); | |
52 | exit (EXIT_FAILURE); | |
53 | } | |
54 | } | |
791b350d CD |
55 | exit (EXIT_FAILURE); |
56 | } | |
57 | ||
58 | static void | |
59 | f1a (void) | |
60 | { | |
f841c97e | 61 | static char st2[32768]; |
791b350d CD |
62 | puts ("start f1a"); |
63 | if (getcontext (&ctx[2]) != 0) | |
64 | { | |
65 | printf ("%s: getcontext: %m\n", __FUNCTION__); | |
66 | exit (EXIT_FAILURE); | |
67 | } | |
68 | ctx[2].uc_stack.ss_sp = st2; | |
69 | ctx[2].uc_stack.ss_size = sizeof st2; | |
70 | ctx[2].uc_link = &ctx[0]; | |
71 | makecontext (&ctx[2], (void (*) (void)) f1b, 0); | |
375a4844 L |
72 | f2 (); |
73 | } | |
74 | ||
791b350d CD |
75 | /* The execution path through the test looks like this: |
76 | do_test (call) | |
77 | -> "making contexts" | |
78 | -> "swap contexts" | |
79 | f1a (via swapcontext to ctx[1], with alternate stack) | |
80 | -> "start f1a" | |
81 | f2 (call) | |
82 | -> "swap contexts in f2" | |
83 | f1b (via swapcontext to ctx[2], with alternate stack) | |
84 | -> "set context in f1b" | |
85 | do_test (via setcontext to ctx[3], main stack) | |
86 | -> "setcontext" | |
87 | f2 (via setcontext to ctx[4], with alternate stack) | |
88 | -> "end f2" | |
89 | ||
90 | We must use an alternate stack for f1b, because if we don't then the | |
91 | result of executing an earlier caller may overwrite registers | |
92 | spilled to the stack in f2. */ | |
375a4844 L |
93 | static int |
94 | do_test (void) | |
95 | { | |
f841c97e | 96 | static char st1[32768]; |
375a4844 L |
97 | puts ("making contexts"); |
98 | if (getcontext (&ctx[0]) != 0) | |
99 | { | |
100 | printf ("%s: getcontext: %m\n", __FUNCTION__); | |
101 | exit (EXIT_FAILURE); | |
102 | } | |
103 | if (getcontext (&ctx[1]) != 0) | |
104 | { | |
105 | printf ("%s: getcontext: %m\n", __FUNCTION__); | |
106 | exit (EXIT_FAILURE); | |
107 | } | |
108 | ctx[1].uc_stack.ss_sp = st1; | |
109 | ctx[1].uc_stack.ss_size = sizeof st1; | |
110 | ctx[1].uc_link = &ctx[0]; | |
791b350d | 111 | makecontext (&ctx[1], (void (*) (void)) f1a, 0); |
375a4844 L |
112 | puts ("swap contexts"); |
113 | if (swapcontext (&ctx[3], &ctx[1]) != 0) | |
114 | { | |
115 | printf ("%s: setcontext: %m\n", __FUNCTION__); | |
116 | exit (EXIT_FAILURE); | |
117 | } | |
118 | if (done != 1) | |
119 | exit (EXIT_FAILURE); | |
120 | done++; | |
121 | puts ("set context"); | |
122 | if (setcontext (&ctx[4]) != 0) | |
123 | { | |
124 | printf ("%s: setcontext: %m\n", __FUNCTION__); | |
125 | exit (EXIT_FAILURE); | |
126 | } | |
127 | exit (EXIT_FAILURE); | |
128 | } | |
129 | ||
130 | #include <support/test-driver.c> |