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
15 #define JAVA_SIGNAL_H 1
18 #include <sys/syscall.h>
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.
33 #define MAKE_THROW_FRAME(_exception) \
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; \
49 #define MAKE_THROW_FRAME(_exception)
52 #if defined(__sparc__)
53 #if defined(__arch64__)
55 static void __rt_sigreturn_stub(void)
57 __asm__("mov %0, %%g1\n\t"
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);
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); \
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); \
97 #else /* __arch64__ */
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);
111 struct kernel_sigaction act; \
112 act.k_sa_sigaction = _Jv_catch_segv; \
114 act.k_sa_flags = SA_SIGINFO; \
115 act.k_sa_restorer = NULL; \
116 syscall (SYS_sigaction, -SIGSEGV, &act, NULL); \
123 struct kernel_sigaction act; \
124 act.k_sa_sigaction = _Jv_catch_fpe; \
126 act.k_sa_flags = SA_SIGINFO; \
127 act.k_sa_restorer = NULL; \
128 syscall (SYS_sigaction, -SIGFPE, &act, NULL); \
132 #elif !defined(__ia64__)
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); \
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); \
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. */
164 // On IA64, unwind information is mandatory, so we can unwind
165 // correctly through glibc frames. Thus we call the ordinary
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); \
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); \
189 #endif /* __ia64__ || __sparc__ */
190 #endif /* JAVA_SIGNAL_H */