| /* Copyright (C) 2006-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <errno.h> |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <ucontext.h> |
| #include <assert.h> |
| #include <unwind.h> |
| #include <dlfcn.h> |
| #include <gnu/lib-names.h> |
| |
| ucontext_t ucp; |
| char st1[16384]; |
| __thread int thr; |
| |
| int somevar = -76; |
| long othervar = -78L; |
| |
| struct trace_arg |
| { |
| int cnt, size; |
| }; |
| |
| static _Unwind_Reason_Code |
| backtrace_helper (struct _Unwind_Context *ctx, void *a) |
| { |
| struct trace_arg *arg = a; |
| if (++arg->cnt == arg->size) |
| return _URC_END_OF_STACK; |
| return _URC_NO_REASON; |
| } |
| |
| void |
| cf (int i) |
| { |
| struct trace_arg arg = { .size = 100, .cnt = -1 }; |
| void *handle; |
| _Unwind_Reason_Code (*unwind_backtrace) (_Unwind_Trace_Fn, void *); |
| |
| if (i != othervar || thr != 94) |
| { |
| printf ("i %d thr %d\n", i, thr); |
| exit (1); |
| } |
| |
| /* Test if callback function of _Unwind_Backtrace is not called infinitely |
| times. See Bug 18508 or gcc bug "Bug 66303 - runtime.Caller() returns |
| infinitely deep stack frames on s390x.". |
| The go runtime calls backtrace_full() in |
| <gcc-src>/libbacktrace/backtrace.c, which uses _Unwind_Backtrace(). */ |
| handle = dlopen (LIBGCC_S_SO, RTLD_LAZY); |
| if (handle != NULL) |
| { |
| unwind_backtrace = dlsym (handle, "_Unwind_Backtrace"); |
| if (unwind_backtrace != NULL) |
| { |
| unwind_backtrace (backtrace_helper, &arg); |
| assert (arg.cnt != -1 && arg.cnt < 100); |
| } |
| dlclose (handle); |
| } |
| |
| /* Since uc_link below has been set to NULL, setcontext is supposed to |
| terminate the process normally after this function returns. */ |
| } |
| |
| int |
| do_test (void) |
| { |
| if (getcontext (&ucp) != 0) |
| { |
| if (errno == ENOSYS) |
| { |
| puts ("context handling not supported"); |
| return 0; |
| } |
| |
| puts ("getcontext failed"); |
| return 1; |
| } |
| thr = 94; |
| ucp.uc_link = NULL; |
| ucp.uc_stack.ss_sp = st1; |
| ucp.uc_stack.ss_size = sizeof st1; |
| makecontext (&ucp, (void (*) (void)) cf, 1, somevar - 2); |
| if (setcontext (&ucp) != 0) |
| { |
| puts ("setcontext failed"); |
| return 1; |
| } |
| return 2; |
| } |
| |
| #define TEST_FUNCTION do_test () |
| #include "../test-skeleton.c" |