1 /* libunwind - a platform-independent unwind library
2 Copyright (C) 2003-2004 Hewlett-Packard Co
3 Contributed by David Mosberger-Tang <davidm@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
get_bsp(void)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
handler(int sig,siginfo_t * si UNUSED,void * ucontext UNUSED)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
main(int argc,char ** argv UNUSED)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