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);
42 #include <libunwind.h>
44 #define panic(args...) \
45 { fprintf (stderr, args); exit (-1); }
47 #define SIG_STACK_SIZE 0x100000
52 /* These variables are global because they
53 * cause the signal stack to overflow */
54 char buf[512], name[256];
61 unw_word_t ip, sp, off;
66 printf ("\texplicit backtrace:\n");
69 if (unw_init_local (&cursor, &uc) < 0)
70 panic ("unw_init_local failed!\n");
74 unw_get_reg (&cursor, UNW_REG_IP, &ip);
75 unw_get_reg (&cursor, UNW_REG_SP, &sp);
77 if (unw_get_proc_name (&cursor, name, sizeof (name), &off) == 0)
80 snprintf (buf, sizeof (buf), "<%s+0x%lx>", name, (long) off);
82 snprintf (buf, sizeof (buf), "<%s>", name);
86 printf ("%016lx %-32s (sp=%016lx)\n", (long) ip, buf, (long) sp);
88 if (unw_get_proc_info (&cursor, &pi) == 0)
90 printf ("\tproc=0x%lx-0x%lx\n\thandler=0x%lx lsda=0x%lx gp=0x%lx",
91 (long) pi.start_ip, (long) pi.end_ip,
92 (long) pi.handler, (long) pi.lsda, (long) pi.gp);
99 unw_get_reg (&cursor, UNW_IA64_BSP, &bsp);
100 printf (" bsp=%lx", bsp);
106 ret = unw_step (&cursor);
109 unw_get_reg (&cursor, UNW_REG_IP, &ip);
110 printf ("FAILURE: unw_step() returned %d for ip=%lx\n",
122 printf ("\n\tvia backtrace():\n");
123 n = backtrace (buffer, 20);
125 for (i = 0; i < n; ++i)
126 printf ("[%d] ip=%p\n", i, buffer[i]);
131 foo (long val UNUSED)
139 extern long f (long);
142 /* This is a vain attempt to use up lots of registers to force
143 the frame-chain info to be saved on the memory stack on ia64.
144 It happens to work with gcc v3.3.4 and gcc v3.4.1 but perhaps
145 not with any other compiler. */
146 foo (f (arr[0]) + (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 + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + (f (v) + f (v))
163 ))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))
164 )))))))))))))))))))))))))))))))))))))))))))))))))))))));
168 sighandler (int signal, void *siginfo UNUSED, void *context)
170 ucontext_t *uc UNUSED;
177 printf ("sighandler: got signal %d, sp=%p", signal, &sp);
179 # if defined(__linux__)
180 printf (" @ %lx", uc->uc_mcontext.sc_ip);
186 __uc_get_reason (uc, &reason);
187 __uc_get_ip (uc, &ip);
188 printf (" @ %lx (reason=%d)", ip, reason);
192 #if defined __linux__
193 printf (" @ %lx", (unsigned long) uc->uc_mcontext.gregs[REG_EIP]);
194 #elif defined __FreeBSD__
195 printf (" @ %lx", (unsigned long) uc->uc_mcontext.mc_eip);
197 #elif UNW_TARGET_X86_64
198 #if defined __linux__
199 printf (" @ %lx", (unsigned long) uc->uc_mcontext.gregs[REG_RIP]);
200 #elif defined __FreeBSD__
201 printf (" @ %lx", (unsigned long) uc->uc_mcontext.mc_rip);
210 main (int argc, char **argv UNUSED)
212 struct sigaction act;
215 verbose = (argc > 1);
218 printf ("Normal backtrace:\n");
222 memset (&act, 0, sizeof (act));
223 act.sa_handler = (void (*)(int)) sighandler;
224 act.sa_flags = SA_SIGINFO;
225 if (sigaction (SIGTERM, &act, NULL) < 0)
226 panic ("sigaction: %s\n", strerror (errno));
229 printf ("\nBacktrace across signal handler:\n");
230 kill (getpid (), SIGTERM);
233 printf ("\nBacktrace across signal handler on alternate stack:\n");
234 stk.ss_sp = malloc (SIG_STACK_SIZE);
236 panic ("failed to allocate %u bytes\n", SIG_STACK_SIZE);
237 stk.ss_size = SIG_STACK_SIZE;
239 if (sigaltstack (&stk, NULL) < 0)
240 panic ("sigaltstack: %s\n", strerror (errno));
242 memset (&act, 0, sizeof (act));
243 act.sa_handler = (void (*)(int)) sighandler;
244 act.sa_flags = SA_ONSTACK | SA_SIGINFO;
245 if (sigaction (SIGTERM, &act, NULL) < 0)
246 panic ("sigaction: %s\n", strerror (errno));
247 kill (getpid (), SIGTERM);
251 fprintf (stderr, "FAILURE: detected %d errors\n", num_errors);
255 printf ("SUCCESS.\n");
257 signal (SIGTERM, SIG_DFL);
258 stk.ss_flags = SS_DISABLE;
259 sigaltstack (&stk, NULL);