1 /* libunwind - a platform-independent unwind library
2 Copyright (C) 2001-2004 Hewlett-Packard Co
3 Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
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:
13 The above copyright notice and this permission notice shall be
14 included in all copies or substantial portions of the Software.
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. */
32 # include <execinfo.h>
34 extern int backtrace (void **, int);
41 #include <libunwind.h>
43 #define panic(args...) \
44 { fprintf (stderr, args); exit (-1); }
46 #define SIG_STACK_SIZE 0x100000
51 /* These variables are global because they
52 * cause the signal stack to overflow */
53 char buf[512], name[256];
60 unw_word_t ip, sp, off;
65 printf ("\texplicit backtrace:\n");
68 if (unw_init_local (&cursor, &uc) < 0)
69 panic ("unw_init_local failed!\n");
73 unw_get_reg (&cursor, UNW_REG_IP, &ip);
74 unw_get_reg (&cursor, UNW_REG_SP, &sp);
76 if (unw_get_proc_name (&cursor, name, sizeof (name), &off) == 0)
79 snprintf (buf, sizeof (buf), "<%s+0x%lx>", name, (long) off);
81 snprintf (buf, sizeof (buf), "<%s>", name);
85 printf ("%016lx %-32s (sp=%016lx)\n", (long) ip, buf, (long) sp);
87 if (unw_get_proc_info (&cursor, &pi) == 0)
89 printf ("\tproc=0x%lx-0x%lx\n\thandler=0x%lx lsda=0x%lx gp=0x%lx",
90 (long) pi.start_ip, (long) pi.end_ip,
91 (long) pi.handler, (long) pi.lsda, (long) pi.gp);
98 unw_get_reg (&cursor, UNW_IA64_BSP, &bsp);
99 printf (" bsp=%lx", bsp);
105 ret = unw_step (&cursor);
108 unw_get_reg (&cursor, UNW_REG_IP, &ip);
109 printf ("FAILURE: unw_step() returned %d for ip=%lx\n",
121 printf ("\n\tvia backtrace():\n");
122 n = backtrace (buffer, 20);
124 for (i = 0; i < n; ++i)
125 printf ("[%d] ip=%p\n", i, buffer[i]);
130 foo (long val UNUSED)
138 extern long f (long);
141 /* This is a vain attempt to use up lots of registers to force
142 the frame-chain info to be saved on the memory stack on ia64.
143 It happens to work with gcc v3.3.4 and gcc v3.4.1 but perhaps
144 not with any other compiler. */
145 foo (f (arr[0]) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
146 + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
147 + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
148 + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
149 + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
150 + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
151 + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
152 + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
153 + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
154 + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
155 + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
156 + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
157 + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
158 + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
159 + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
160 + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v)
161 + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + f (v))
162 ))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
163 )))))))))))))))))))))))))))))))))))))))))))))))))))))));
167 sighandler (int signal, void *siginfo UNUSED, void *context)
169 ucontext_t *uc UNUSED;
176 printf ("sighandler: got signal %d, sp=%p", signal, &sp);
178 # if defined(__linux__)
179 printf (" @ %lx", uc->uc_mcontext.sc_ip);
185 __uc_get_reason (uc, &reason);
186 __uc_get_ip (uc, &ip);
187 printf (" @ %lx (reason=%d)", ip, reason);
191 #if defined __linux__
192 printf (" @ %lx", (unsigned long) uc->uc_mcontext.gregs[REG_EIP]);
193 #elif defined __FreeBSD__
194 printf (" @ %lx", (unsigned long) uc->uc_mcontext.mc_eip);
196 #elif UNW_TARGET_X86_64
197 #if defined __linux__
198 printf (" @ %lx", (unsigned long) uc->uc_mcontext.gregs[REG_RIP]);
199 #elif defined __FreeBSD__
200 printf (" @ %lx", (unsigned long) uc->uc_mcontext.mc_rip);
209 main (int argc, char **argv UNUSED)
211 struct sigaction act;
214 verbose = (argc > 1);
217 printf ("Normal backtrace:\n");
221 memset (&act, 0, sizeof (act));
222 act.sa_handler = (void (*)(int)) sighandler;
223 act.sa_flags = SA_SIGINFO;
224 if (sigaction (SIGTERM, &act, NULL) < 0)
225 panic ("sigaction: %s\n", strerror (errno));
228 printf ("\nBacktrace across signal handler:\n");
229 kill (getpid (), SIGTERM);
232 printf ("\nBacktrace across signal handler on alternate stack:\n");
233 stk.ss_sp = malloc (SIG_STACK_SIZE);
235 panic ("failed to allocate %u bytes\n", SIG_STACK_SIZE);
236 stk.ss_size = SIG_STACK_SIZE;
238 if (sigaltstack (&stk, NULL) < 0)
239 panic ("sigaltstack: %s\n", strerror (errno));
241 memset (&act, 0, sizeof (act));
242 act.sa_handler = (void (*)(int)) sighandler;
243 act.sa_flags = SA_ONSTACK | SA_SIGINFO;
244 if (sigaction (SIGTERM, &act, NULL) < 0)
245 panic ("sigaction: %s\n", strerror (errno));
246 kill (getpid (), SIGTERM);
250 fprintf (stderr, "FAILURE: detected %d errors\n", num_errors);
254 printf ("SUCCESS.\n");
256 signal (SIGTERM, SIG_DFL);
257 stk.ss_flags = SS_DISABLE;
258 sigaltstack (&stk, NULL);