1 | /* Copyright (C) 2006-2022 Free Software Foundation, Inc. |
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 |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <errno.h> |
19 | #include <stdlib.h> |
20 | #include <stdio.h> |
21 | #include <ucontext.h> |
22 | #include <assert.h> |
23 | #include <unwind.h> |
24 | #include <dlfcn.h> |
25 | #include <gnu/lib-names.h> |
26 | |
27 | ucontext_t ucp; |
28 | char st1[16384]; |
29 | __thread int thr; |
30 | |
31 | int somevar = -76; |
32 | long othervar = -78L; |
33 | |
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 | |
48 | void |
49 | cf (int i) |
50 | { |
51 | struct trace_arg arg = { .size = 100, .cnt = -1 }; |
52 | void *handle; |
53 | _Unwind_Reason_Code (*unwind_backtrace) (_Unwind_Trace_Fn, void *); |
54 | |
55 | if (i != othervar || thr != 94) |
56 | { |
57 | printf (format: "i %d thr %d\n" , i, thr); |
58 | exit (1); |
59 | } |
60 | |
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: handle, name: "_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: handle); |
76 | } |
77 | |
78 | /* Since uc_link below has been set to NULL, setcontext is supposed to |
79 | terminate the process normally after this function returns. */ |
80 | } |
81 | |
82 | int |
83 | do_test (void) |
84 | { |
85 | if (getcontext (ucp: &ucp) != 0) |
86 | { |
87 | if (errno == ENOSYS) |
88 | { |
89 | puts (s: "context handling not supported" ); |
90 | return 0; |
91 | } |
92 | |
93 | puts (s: "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; |
100 | makecontext (ucp: &ucp, func: (void (*) (void)) cf, argc: 1, somevar - 2); |
101 | if (setcontext (&ucp) != 0) |
102 | { |
103 | puts (s: "setcontext failed" ); |
104 | return 1; |
105 | } |
106 | return 2; |
107 | } |
108 | |
109 | #define TEST_FUNCTION do_test () |
110 | #include "../test-skeleton.c" |
111 | |