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6d7e8eda | 1 | /* Copyright (C) 2006-2023 Free Software Foundation, Inc. |
a12dcecc UD |
2 | This file is part of the GNU C Library. |
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/>. */ |
a12dcecc | 17 | |
d6220e9e | 18 | #include <errno.h> |
a12dcecc UD |
19 | #include <stdlib.h> |
20 | #include <stdio.h> | |
21 | #include <ucontext.h> | |
890b7a4b SL |
22 | #include <assert.h> |
23 | #include <unwind.h> | |
24 | #include <dlfcn.h> | |
25 | #include <gnu/lib-names.h> | |
a12dcecc UD |
26 | |
27 | ucontext_t ucp; | |
890b7a4b | 28 | char st1[16384]; |
a12dcecc UD |
29 | __thread int thr; |
30 | ||
3b32d8a2 | 31 | int somevar = -76; |
117df5d9 | 32 | long othervar = -78L; |
3b32d8a2 | 33 | |
890b7a4b SL |
34 | struct trace_arg |
35 | { | |
36 | int cnt, size; | |
37 | }; | |
38 | ||
39 | static _Unwind_Reason_Code | |
40 | backtrace_helper (struct _Unwind_Context *ctx, void *a) | |
41 | { | |
42 | struct trace_arg *arg = a; | |
43 | if (++arg->cnt == arg->size) | |
44 | return _URC_END_OF_STACK; | |
45 | return _URC_NO_REASON; | |
46 | } | |
47 | ||
a12dcecc UD |
48 | void |
49 | cf (int i) | |
50 | { | |
890b7a4b SL |
51 | struct trace_arg arg = { .size = 100, .cnt = -1 }; |
52 | void *handle; | |
53 | _Unwind_Reason_Code (*unwind_backtrace) (_Unwind_Trace_Fn, void *); | |
54 | ||
117df5d9 | 55 | if (i != othervar || thr != 94) |
a12dcecc UD |
56 | { |
57 | printf ("i %d thr %d\n", i, thr); | |
58 | exit (1); | |
59 | } | |
dc97c227 | 60 | |
890b7a4b SL |
61 | /* Test if callback function of _Unwind_Backtrace is not called infinitely |
62 | times. See Bug 18508 or gcc bug "Bug 66303 - runtime.Caller() returns | |
63 | infinitely deep stack frames on s390x.". | |
64 | The go runtime calls backtrace_full() in | |
65 | <gcc-src>/libbacktrace/backtrace.c, which uses _Unwind_Backtrace(). */ | |
66 | handle = dlopen (LIBGCC_S_SO, RTLD_LAZY); | |
67 | if (handle != NULL) | |
68 | { | |
69 | unwind_backtrace = dlsym (handle, "_Unwind_Backtrace"); | |
70 | if (unwind_backtrace != NULL) | |
71 | { | |
72 | unwind_backtrace (backtrace_helper, &arg); | |
73 | assert (arg.cnt != -1 && arg.cnt < 100); | |
74 | } | |
75 | dlclose (handle); | |
76 | } | |
77 | ||
dc97c227 TS |
78 | /* Since uc_link below has been set to NULL, setcontext is supposed to |
79 | terminate the process normally after this function returns. */ | |
a12dcecc UD |
80 | } |
81 | ||
82 | int | |
d6220e9e | 83 | do_test (void) |
a12dcecc UD |
84 | { |
85 | if (getcontext (&ucp) != 0) | |
86 | { | |
d6220e9e UD |
87 | if (errno == ENOSYS) |
88 | { | |
89 | puts ("context handling not supported"); | |
90 | return 0; | |
91 | } | |
92 | ||
a12dcecc UD |
93 | puts ("getcontext failed"); |
94 | return 1; | |
95 | } | |
96 | thr = 94; | |
97 | ucp.uc_link = NULL; | |
98 | ucp.uc_stack.ss_sp = st1; | |
99 | ucp.uc_stack.ss_size = sizeof st1; | |
3b32d8a2 | 100 | makecontext (&ucp, (void (*) (void)) cf, 1, somevar - 2); |
a12dcecc UD |
101 | if (setcontext (&ucp) != 0) |
102 | { | |
103 | puts ("setcontext failed"); | |
104 | return 1; | |
105 | } | |
106 | return 2; | |
107 | } | |
d6220e9e UD |
108 | |
109 | #define TEST_FUNCTION do_test () | |
110 | #include "../test-skeleton.c" |