1/* This testcase is part of GDB, the GNU debugger. 2 3 Copyright 1996, 1999, 2003, 2004 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 2 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, write to the Free Software 17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 18 02111-1307, USA. */ 19 20#include <signal.h> 21#include <setjmp.h> 22#include <stdlib.h> 23#include <string.h> 24 25enum tests { 26 code_entry_point, code_descriptor, data_read, data_write 27}; 28 29static volatile enum tests test; 30 31/* Some basic types and zero buffers. */ 32 33typedef long data_t; 34typedef long code_t (void); 35data_t *volatile data; 36code_t *volatile code; 37/* "desc" is intentionally initialized to a data object. This is 38 needed to test function descriptors on arches like ia64. */ 39data_t zero[10]; 40code_t *volatile desc = (code_t *) (void *) zero; 41 42sigjmp_buf env; 43 44extern void 45keeper (int sig) 46{ 47 siglongjmp (env, 0); 48} 49 50extern long 51bowler (void) 52{ 53 switch (test) 54 { 55 case data_read: 56 /* Try to read address zero. */ 57 return (*data); 58 case data_write: 59 /* Try to write (the assignment) to address zero. */ 60 return (*data) = 1; 61 case code_entry_point: 62 /* For typical architectures, call a function at address 63 zero. */ 64 return (*code) (); 65 case code_descriptor: 66 /* For atypical architectures that use function descriptors, 67 call a function descriptor, the code field of which is zero 68 (which has the effect of jumping to address zero). */ 69 return (*desc) (); 70 } 71} 72 73int 74main () 75{ 76 static volatile int i; 77 78 struct sigaction act; 79 memset (&act, 0, sizeof act); 80 act.sa_handler = keeper; 81 sigaction (SIGSEGV, &act, NULL); 82 83 for (i = 0; i < 10; i++) 84 { 85 sigsetjmp (env, 1); 86 bowler (); 87 } 88} 89