1 /* This testcase is part of GDB, the GNU debugger. 2 3 Copyright 2004-2016 Free Software Foundation, Inc. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 This program 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 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. 17 18 */ 19 20 #include <signal.h> 21 #include <stdlib.h> 22 #include <stdio.h> 23 #include <string.h> 24 #include <sys/mman.h> 25 #include <unistd.h> 26 27 static void *p; 28 29 static void 30 handler (int sig, siginfo_t *info, void *context) 31 { 32 /* Copy to local vars, as the test wants to read them, and si_addr, 33 etc. may be preprocessor defines. */ 34 int ssi_errno = info->si_errno; 35 int ssi_signo = info->si_signo; 36 int ssi_code = info->si_code; 37 void *ssi_addr = info->si_addr; 38 39 _exit (0); /* set breakpoint here */ 40 } 41 42 int 43 main (void) 44 { 45 /* Set up unwritable memory. */ 46 { 47 size_t len; 48 len = sysconf(_SC_PAGESIZE); 49 p = mmap (0, len, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0); 50 if (p == MAP_FAILED) 51 { 52 perror ("mmap"); 53 return 1; 54 } 55 } 56 /* Set up the signal handler. */ 57 { 58 struct sigaction action; 59 memset (&action, 0, sizeof (action)); 60 action.sa_sigaction = handler; 61 action.sa_flags |= SA_SIGINFO; 62 if (sigaction (SIGSEGV, &action, NULL)) 63 { 64 perror ("sigaction"); 65 return 1; 66 } 67 } 68 /* Trigger SIGSEGV. */ 69 *(int *)p = 0; 70 return 0; 71 } 72