| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Copyright (C) 2006-2016 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 | <http://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 ("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, "_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 | |
| 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) != 0) |
| 86 | { |
| 87 | if (errno == ENOSYS) |
| 88 | { |
| 89 | puts ("context handling not supported"); |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 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; |
| 100 | makecontext (&ucp, (void (*) (void)) cf, 1, somevar - 2); |
| 101 | if (setcontext (&ucp) != 0) |
| 102 | { |
| 103 | puts ("setcontext failed"); |
| 104 | return 1; |
| 105 | } |
| 106 | return 2; |
| 107 | } |
| 108 | |
| 109 | #define TEST_FUNCTION do_test () |
| 110 | #include "../test-skeleton.c" |