1 /* Test that the handler can be exited multiple times.
2 Copyright (C) 2002-2021 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program 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
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
17 /* Written by Bruno Haible. */
27 #if HAVE_SIGSEGV_RECOVERY
29 # if defined _WIN32 && !defined __CYGWIN__
30 /* Windows doesn't have sigset_t. */
32 # define sigemptyset(set)
33 # define sigprocmask(how,set,oldset)
36 # include "mmap-anon-util.h"
37 # include <stdlib.h> /* for abort, exit */
41 # if SIGSEGV_FAULT_ADDRESS_ALIGNMENT > 1UL
43 # define SIGSEGV_FAULT_ADDRESS_ROUNDOFF_BITS (getpagesize () - 1)
45 # define SIGSEGV_FAULT_ADDRESS_ROUNDOFF_BITS 0
51 volatile int pass = 0;
54 volatile int handler_called = 0;
57 handler_continuation (void *arg1, void *arg2, void *arg3)
59 longjmp (mainloop, pass);
63 handler (void *fault_address, int serious)
66 if (handler_called > 10)
69 != (void *)((page + 0x678 + 8 * pass) & ~SIGSEGV_FAULT_ADDRESS_ROUNDOFF_BITS))
72 printf ("Fault %d caught.\n", pass);
73 sigprocmask (SIG_SETMASK, &mainsigset, NULL);
74 return sigsegv_leave_handler (handler_continuation, NULL, NULL, NULL);
80 *(volatile int *) (p + 0x678 + 8 * pass) = 42;
91 # if !HAVE_MAP_ANONYMOUS
92 zero_fd = open ("/dev/zero", O_RDONLY, 0644);
95 # if defined __linux__ && defined __sparc__
96 /* On Linux 2.6.26/SPARC64, PROT_READ has the same effect as
97 PROT_READ | PROT_WRITE. */
98 prot_unwritable = PROT_NONE;
100 prot_unwritable = PROT_READ;
103 /* Setup some mmaped memory. */
104 p = mmap_zeromap ((void *) 0x12340000, 0x4000);
105 if (p == (void *)(-1))
107 fprintf (stderr, "mmap_zeromap failed.\n");
110 page = (uintptr_t) p;
112 /* Make it read-only. */
113 if (mprotect ((void *) page, 0x4000, prot_unwritable) < 0)
115 fprintf (stderr, "mprotect failed.\n");
119 /* Install the SIGSEGV handler. */
120 if (sigsegv_install_handler (&handler) < 0)
123 /* Save the current signal mask. */
124 sigemptyset (&emptyset);
125 sigprocmask (SIG_BLOCK, &emptyset, &mainsigset);
127 /* Provoke two SIGSEGVs in a row. */
128 switch (setjmp (mainloop))
131 printf ("Doing SIGSEGV pass %d.\n", pass + 1);
133 printf ("no SIGSEGV?!\n"); exit (1);
141 printf ("Test passed.\n");