1 /* libunwind - a platform-independent unwind library 2 Copyright (C) 2003-2004 Hewlett-Packard Co 3 Contributed by David Mosberger-Tang <davidm (at) hpl.hp.com> 4 5 Permission is hereby granted, free of charge, to any person obtaining 6 a copy of this software and associated documentation files (the 7 "Software"), to deal in the Software without restriction, including 8 without limitation the rights to use, copy, modify, merge, publish, 9 distribute, sublicense, and/or sell copies of the Software, and to 10 permit persons to whom the Software is furnished to do so, subject to 11 the following conditions: 12 13 The above copyright notice and this permission notice shall be 14 included in all copies or substantial portions of the Software. 15 16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 17 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 18 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 19 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 20 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 21 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 22 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ 23 24 /* Verify that unw_resume() restores the signal mask at proper time. */ 25 26 #ifdef HAVE_CONFIG_H 27 # include "config.h" 28 #endif 29 30 #include "compiler.h" 31 32 #include <libunwind.h> 33 #include <signal.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <unistd.h> 38 #include <errno.h> 39 40 #ifdef HAVE_IA64INTRIN_H 41 # include <ia64intrin.h> 42 #endif 43 44 #define panic(args...) \ 45 do { fprintf (stderr, args); ++nerrors; } while (0) 46 47 int verbose; 48 int nerrors; 49 int got_usr1, got_usr2; 50 char *sigusr1_sp; 51 52 uintptr_t 53 get_bsp (void) 54 { 55 #if UNW_TARGET_IA64 56 # ifdef __INTEL_COMPILER 57 return __getReg (_IA64_REG_AR_BSP); 58 # else 59 return (uintptr_t) __builtin_ia64_bsp (); 60 # endif 61 #else 62 return 0; 63 #endif 64 } 65 66 #ifdef TEST_WITH_SIGINFO 67 void 68 handler (int sig, 69 siginfo_t *si UNUSED, 70 void *ucontext UNUSED) 71 #else 72 void 73 handler (int sig) 74 #endif 75 { 76 unw_word_t ip; 77 sigset_t mask, oldmask; 78 unw_context_t uc; 79 unw_cursor_t c; 80 char foo; 81 int ret; 82 83 #if UNW_TARGET_IA64 84 if (verbose) 85 printf ("bsp = %llx\n", (unsigned long long) get_bsp ()); 86 #endif 87 88 if (verbose) 89 printf ("got signal %d\n", sig); 90 91 if (sig == SIGUSR1) 92 { 93 ++got_usr1; 94 sigusr1_sp = &foo; 95 96 sigemptyset (&mask); 97 sigaddset (&mask, SIGUSR2); 98 sigprocmask (SIG_BLOCK, &mask, &oldmask); 99 kill (getpid (), SIGUSR2); /* pend SIGUSR2 */ 100 101 signal (SIGUSR1, SIG_IGN); 102 103 if ((ret = unw_getcontext (&uc)) < 0) 104 panic ("unw_getcontext() failed: ret=%d\n", ret); 105 #if UNW_TARGET_X86_64 106 /* unw_getcontext() doesn't save signal mask to avoid a syscall */ 107 uc.uc_sigmask = oldmask; 108 #endif 109 if ((ret = unw_init_local (&c, &uc)) < 0) 110 panic ("unw_init_local() failed: ret=%d\n", ret); 111 112 if ((ret = unw_step (&c)) < 0) /* step to signal trampoline */ 113 panic ("unw_step(1) failed: ret=%d\n", ret); 114 115 if ((ret = unw_step (&c)) < 0) /* step to kill() */ 116 panic ("unw_step(2) failed: ret=%d\n", ret); 117 118 if ((ret = unw_get_reg (&c, UNW_REG_IP, &ip)) < 0) 119 panic ("unw_get_reg(IP) failed: ret=%d\n", ret); 120 if (verbose) 121 printf ("resuming at 0x%lx, with SIGUSR2 pending\n", 122 (unsigned long) ip); 123 unw_resume (&c); 124 } 125 else if (sig == SIGUSR2) 126 { 127 ++got_usr2; 128 if (got_usr1) 129 { 130 if (verbose) 131 printf ("OK: stack still at %p\n", &foo); 132 } 133 signal (SIGUSR2, SIG_IGN); 134 } 135 else 136 panic ("Got unexpected signal %d\n", sig); 137 } 138 139 int 140 main (int argc, char **argv UNUSED) 141 { 142 struct sigaction sa; 143 float d = 1.0; 144 int n = 0; 145 146 if (argc > 1) 147 verbose = 1; 148 149 memset (&sa, 0, sizeof(sa)); 150 #ifdef TEST_WITH_SIGINFO 151 sa.sa_sigaction = handler; 152 sa.sa_flags = SA_SIGINFO; 153 #else 154 sa.sa_handler = handler; 155 #endif 156 157 if (sigaction (SIGUSR1, &sa, NULL) != 0 || 158 sigaction (SIGUSR2, &sa, NULL) != 0) 159 { 160 fprintf (stderr, "sigaction() failed: %s\n", strerror (errno)); 161 return -1; 162 } 163 164 /* Use the FPU a bit; otherwise we get spurious errors should the 165 signal handler need to use the FPU for any reason. This seems to 166 happen on x86-64. */ 167 while (d > 0.0) 168 { 169 d /= 2.0; 170 ++n; 171 } 172 if (n > 9999) 173 return -1; /* can't happen, but don't tell the compiler... */ 174 175 if (verbose) 176 printf ("sending SIGUSR1\n"); 177 kill (getpid (), SIGUSR1); 178 179 if (!got_usr2) 180 panic ("failed to get SIGUSR2\n"); 181 182 if (nerrors) 183 { 184 fprintf (stderr, "FAILURE: detected %d errors\n", nerrors); 185 exit (-1); 186 } 187 188 if (verbose) 189 printf ("SUCCESS\n"); 190 return 0; 191 } 192
