* doc/invoke.texi: Document -fsanitize=bool and -fsanitize=enum.
[official-gcc.git] / libjava / include / dwarf2-signal.h
blobec5929c915d9e41f180200a33b25a62d6f4a8155
1 // dwarf2-signal.h - Catch runtime signals and turn them into exceptions.
3 /* Copyright (C) 2000, 2001, 2009, 2011, 2014 Free Software Foundation
5 This file is part of libgcj.
7 Use this file for a target for which the dwarf2 unwinder in libgcc
8 can unwind through signal handlers.
10 This software is copyrighted work licensed under the terms of the
11 Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
12 details. */
14 #ifndef JAVA_SIGNAL_H
15 #define JAVA_SIGNAL_H 1
17 #include <signal.h>
18 #include <sys/syscall.h>
20 #define HANDLE_SEGV 1
21 #undef HANDLE_FPE
23 #define SIGNAL_HANDLER(_name) \
24 static void _Jv_##_name (int, siginfo_t *, \
25 void *_p __attribute__ ((__unused__)))
27 // Unwind the stack to the point at which the signal was generated and
28 // then throw an exception. With the dwarf2 unwinder we don't usually
29 // need to do anything, with some minor exceptions.
31 #ifdef __ia64__
33 #define MAKE_THROW_FRAME(_exception) \
34 do \
35 { \
36 /* IA-64 either leaves PC pointing at a faulting instruction or the \
37 following instruction, depending on the signal. SEGV always does \
38 the former, so we adjust the saved PC to point to the following \
39 instruction; this is what the handler in libgcc expects. */ \
40 /* Note that we are lying to the unwinder here, which expects the \
41 faulting pc, not pc+1. But we claim the unwind information can't \
42 be changed by such a ld or st instruction, so it doesn't matter. */ \
43 struct sigcontext *_sc = (struct sigcontext *)_p; \
44 _sc->sc_ip++; \
45 } \
46 while (0)
48 #else
49 #define MAKE_THROW_FRAME(_exception)
50 #endif
52 #if defined(__sparc__)
53 #if defined(__arch64__)
54 extern "C" {
55 static void __rt_sigreturn_stub(void)
57 __asm__("mov %0, %%g1\n\t"
58 "ta 0x6d\n\t"
59 : /* no outputs */
60 : "i" (__NR_rt_sigreturn));
62 struct kernel_sigaction
64 void (*k_sa_sigaction)(int,siginfo_t *,void *);
65 unsigned long k_sa_flags;
66 void (*k_sa_restorer)(void);
67 sigset_t k_sa_mask;
70 #define INIT_SEGV \
71 do \
72 { \
73 struct kernel_sigaction act; \
74 unsigned long stub = ((unsigned long)&__rt_sigreturn_stub); \
75 act.k_sa_sigaction = _Jv_catch_segv; \
76 sigemptyset (&act.k_sa_mask); \
77 act.k_sa_flags = SA_SIGINFO; \
78 act.k_sa_restorer = NULL; \
79 syscall (SYS_rt_sigaction, SIGSEGV, &act, NULL, \
80 stub - 8, _NSIG / 8); \
81 } \
82 while (0)
84 #define INIT_FPE \
85 do \
86 { \
87 struct kernel_sigaction act; \
88 unsigned long stub = ((unsigned long)&__rt_sigreturn_stub); \
89 act.k_sa_sigaction = _Jv_catch_fpe; \
90 sigemptyset (&act.k_sa_mask); \
91 act.k_sa_flags = SA_SIGINFO; \
92 act.k_sa_restorer = NULL; \
93 syscall (SYS_rt_sigaction, SIGFPE, &act, NULL, \
94 stub - 8, _NSIG / 8); \
95 } \
96 while (0)
97 #else /* __arch64__ */
99 extern "C" {
100 struct kernel_sigaction
102 void (*k_sa_sigaction)(int,siginfo_t *,void *);
103 unsigned long k_sa_mask, k_sa_flags;
104 void (*k_sa_restorer)(void);
108 #define INIT_SEGV \
109 do \
111 struct kernel_sigaction act; \
112 act.k_sa_sigaction = _Jv_catch_segv; \
113 act.k_sa_mask = 0; \
114 act.k_sa_flags = SA_SIGINFO; \
115 act.k_sa_restorer = NULL; \
116 syscall (SYS_sigaction, -SIGSEGV, &act, NULL); \
118 while (0)
120 #define INIT_FPE \
121 do \
123 struct kernel_sigaction act; \
124 act.k_sa_sigaction = _Jv_catch_fpe; \
125 act.k_sa_mask = 0; \
126 act.k_sa_flags = SA_SIGINFO; \
127 act.k_sa_restorer = NULL; \
128 syscall (SYS_sigaction, -SIGFPE, &act, NULL); \
130 while (0)
131 #endif
132 #elif !defined(__ia64__)
133 #define INIT_SEGV \
134 do \
136 struct sigaction act; \
137 act.sa_sigaction = _Jv_catch_segv; \
138 sigemptyset (&act.sa_mask); \
139 act.sa_flags = SA_SIGINFO; \
140 syscall (SYS_sigaction, SIGSEGV, &act, NULL); \
142 while (0)
144 #define INIT_FPE \
145 do \
147 struct sigaction act; \
148 act.sa_sigaction = _Jv_catch_fpe; \
149 sigemptyset (&act.sa_mask); \
150 act.sa_flags = SA_SIGINFO; \
151 syscall (SYS_sigaction, SIGFPE, &act, NULL); \
153 while (0)
155 /* We use syscall(SYS_sigaction) in INIT_SEGV and INIT_FPE instead of
156 * sigaction() because on some systems the pthreads wrappers for
157 * signal handlers are not compiled with unwind information, so it's
158 * not possible to unwind through them. This is a problem that will
159 * go away once all systems have pthreads libraries that are
160 * compiled with full unwind info. */
162 #else /* __ia64__ */
164 // On IA64, unwind information is mandatory, so we can unwind
165 // correctly through glibc frames. Thus we call the ordinary
166 // sigaction.
168 #define INIT_SEGV \
169 do \
171 struct sigaction act; \
172 act.sa_sigaction = _Jv_catch_segv; \
173 sigemptyset (&act.sa_mask); \
174 act.sa_flags = SA_SIGINFO; \
175 sigaction (SIGSEGV, &act, NULL); \
177 while (0)
179 #define INIT_FPE \
180 do \
182 struct sigaction act; \
183 act.sa_sigaction = _Jv_catch_fpe; \
184 sigemptyset (&act.sa_mask); \
185 act.sa_flags = SA_SIGINFO; \
186 sigaction (SIGFPE, &act, NULL); \
188 while (0)
189 #endif /* __ia64__ || __sparc__ */
190 #endif /* JAVA_SIGNAL_H */