sysdeps/unix/sysv/linux/tst-sigcontext-get_pc.c

   1 /* Test that the GET_PC macro is consistent with the unwinder.
   2    Copyright (C) 2019-2024 Free Software Foundation, Inc.
   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 License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    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; see the file COPYING.LIB.  If
  17    not, see <https://www.gnu.org/licenses/>.  */
  18
  19 /* This test searches for the value of the GET_PC macro in the
  20    addresses obtained from the backtrace function.  */
  21
  22 #include <array_length.h>
  23 #include <execinfo.h>
  24 #include <inttypes.h>
  25 #include <signal.h>
  26 #include <stdbool.h>
  27 #include <stdio.h>
  28 #include <support/check.h>
  29 #include <support/xsignal.h>
  30 #include <sigcontextinfo.h>
  31
  32 static bool handler_called;
  33
  34 static void
  35 handler (int signal, siginfo_t *info, void *ctx)
  36 {
  37   TEST_COMPARE (signal, SIGUSR1);
  38
  39   uintptr_t pc = sigcontext_get_pc (ctx);
  40   printf ("info: address in signal handler: 0x%" PRIxPTR "\n", pc);
  41
  42   void *callstack[10];
  43   int callstack_count = backtrace (callstack, array_length (callstack));
  44   TEST_VERIFY_EXIT (callstack_count > 0);
  45   TEST_VERIFY_EXIT (callstack_count <= array_length (callstack));
  46   bool found = false;
  47   for (int i = 0; i < callstack_count; ++i)
  48     {
  49       const char *marker;
  50       if ((uintptr_t) callstack[i] == pc)
  51         {
  52           found = true;
  53           marker = " *";
  54         }
  55       else
  56         marker = "";
  57       printf ("info: call stack entry %d: 0x%" PRIxPTR "%s\n",
  58               i, (uintptr_t) callstack[i], marker);
  59     }
  60   TEST_VERIFY (found);
  61   handler_called = true;
  62 }
  63
  64 static int
  65 do_test (void)
  66 {
  67   struct sigaction sa =
  68     {
  69      .sa_sigaction = &handler,
  70      .sa_flags = SA_SIGINFO
  71     };
  72   xsigaction (SIGUSR1, &sa, NULL);
  73   raise (SIGUSR1);
  74   TEST_VERIFY (handler_called);
  75   return 0;
  76 }
  77
  78 #include <support/test-driver.c>