| // dwarf2-signal.h - Catch runtime signals and turn them into exceptions. |
| |
| /* Copyright (C) 2000, 2001, 2009, 2011 Free Software Foundation |
| |
| This file is part of libgcj. |
| |
| Use this file for a target for which the dwarf2 unwinder in libgcc |
| can unwind through signal handlers. |
| |
| This software is copyrighted work licensed under the terms of the |
| Libgcj License. Please consult the file "LIBGCJ_LICENSE" for |
| details. */ |
| |
| #ifndef JAVA_SIGNAL_H |
| #define JAVA_SIGNAL_H 1 |
| |
| #include <signal.h> |
| #include <sys/syscall.h> |
| |
| #define HANDLE_SEGV 1 |
| #undef HANDLE_FPE |
| |
| #define SIGNAL_HANDLER(_name) \ |
| static void _Jv_##_name (int, siginfo_t *_sip, void *_p) |
| |
| class java::lang::Throwable; |
| |
| // Unwind the stack to the point at which the signal was generated and |
| // then throw an exception. With the dwarf2 unwinder we don't usually |
| // need to do anything, with some minor exceptions. |
| |
| #ifdef __ia64__ |
| |
| #define MAKE_THROW_FRAME(_exception) \ |
| do \ |
| { \ |
| /* IA-64 either leaves PC pointing at a faulting instruction or the \ |
| following instruction, depending on the signal. SEGV always does \ |
| the former, so we adjust the saved PC to point to the following \ |
| instruction; this is what the handler in libgcc expects. */ \ |
| /* Note that we are lying to the unwinder here, which expects the \ |
| faulting pc, not pc+1. But we claim the unwind information can't \ |
| be changed by such a ld or st instruction, so it doesn't matter. */ \ |
| struct sigcontext *_sc = (struct sigcontext *)_p; \ |
| _sc->sc_ip++; \ |
| } \ |
| while (0) |
| |
| #else |
| #define MAKE_THROW_FRAME(_exception) \ |
| do \ |
| { \ |
| (void)_p; \ |
| } \ |
| while (0) |
| #endif |
| |
| #if defined(__sparc__) |
| #if defined(__arch64__) |
| extern "C" { |
| static void __rt_sigreturn_stub(void) |
| { |
| __asm__("mov %0, %%g1\n\t" |
| "ta 0x6d\n\t" |
| : /* no outputs */ |
| : "i" (__NR_rt_sigreturn)); |
| } |
| struct kernel_sigaction |
| { |
| void (*k_sa_sigaction)(int,siginfo_t *,void *); |
| unsigned long k_sa_flags; |
| void (*k_sa_restorer)(void); |
| sigset_t k_sa_mask; |
| }; |
| } |
| #define INIT_SEGV \ |
| do \ |
| { \ |
| struct kernel_sigaction act; \ |
| unsigned long stub = ((unsigned long)&__rt_sigreturn_stub); \ |
| act.k_sa_sigaction = _Jv_catch_segv; \ |
| sigemptyset (&act.k_sa_mask); \ |
| act.k_sa_flags = SA_SIGINFO; \ |
| act.k_sa_restorer = NULL; \ |
| syscall (SYS_rt_sigaction, SIGSEGV, &act, NULL, \ |
| stub - 8, _NSIG / 8); \ |
| } \ |
| while (0) |
| |
| #define INIT_FPE \ |
| do \ |
| { \ |
| struct kernel_sigaction act; \ |
| unsigned long stub = ((unsigned long)&__rt_sigreturn_stub); \ |
| act.k_sa_sigaction = _Jv_catch_fpe; \ |
| sigemptyset (&act.k_sa_mask); \ |
| act.k_sa_flags = SA_SIGINFO; \ |
| act.k_sa_restorer = NULL; \ |
| syscall (SYS_rt_sigaction, SIGFPE, &act, NULL, \ |
| stub - 8, _NSIG / 8); \ |
| } \ |
| while (0) |
| #else /* __arch64__ */ |
| |
| extern "C" { |
| struct kernel_sigaction |
| { |
| void (*k_sa_sigaction)(int,siginfo_t *,void *); |
| unsigned long k_sa_mask, k_sa_flags; |
| void (*k_sa_restorer)(void); |
| }; |
| } |
| |
| #define INIT_SEGV \ |
| do \ |
| { \ |
| struct kernel_sigaction act; \ |
| act.k_sa_sigaction = _Jv_catch_segv; \ |
| act.k_sa_mask = 0; \ |
| act.k_sa_flags = SA_SIGINFO; \ |
| act.k_sa_restorer = NULL; \ |
| syscall (SYS_sigaction, -SIGSEGV, &act, NULL); \ |
| } \ |
| while (0) |
| |
| #define INIT_FPE \ |
| do \ |
| { \ |
| struct kernel_sigaction act; \ |
| act.k_sa_sigaction = _Jv_catch_fpe; \ |
| act.k_sa_mask = 0; \ |
| act.k_sa_flags = SA_SIGINFO; \ |
| act.k_sa_restorer = NULL; \ |
| syscall (SYS_sigaction, -SIGFPE, &act, NULL); \ |
| } \ |
| while (0) |
| #endif |
| #elif !defined(__ia64__) |
| #define INIT_SEGV \ |
| do \ |
| { \ |
| struct sigaction act; \ |
| act.sa_sigaction = _Jv_catch_segv; \ |
| sigemptyset (&act.sa_mask); \ |
| act.sa_flags = SA_SIGINFO; \ |
| syscall (SYS_sigaction, SIGSEGV, &act, NULL); \ |
| } \ |
| while (0) |
| |
| #define INIT_FPE \ |
| do \ |
| { \ |
| struct sigaction act; \ |
| act.sa_sigaction = _Jv_catch_fpe; \ |
| sigemptyset (&act.sa_mask); \ |
| act.sa_flags = SA_SIGINFO; \ |
| syscall (SYS_sigaction, SIGFPE, &act, NULL); \ |
| } \ |
| while (0) |
| |
| /* We use syscall(SYS_sigaction) in INIT_SEGV and INIT_FPE instead of |
| * sigaction() because on some systems the pthreads wrappers for |
| * signal handlers are not compiled with unwind information, so it's |
| * not possible to unwind through them. This is a problem that will |
| * go away once all systems have pthreads libraries that are |
| * compiled with full unwind info. */ |
| |
| #else /* __ia64__ */ |
| |
| // On IA64, unwind information is mandatory, so we can unwind |
| // correctly through glibc frames. Thus we call the ordinary |
| // sigaction. |
| |
| #define INIT_SEGV \ |
| do \ |
| { \ |
| struct sigaction act; \ |
| act.sa_sigaction = _Jv_catch_segv; \ |
| sigemptyset (&act.sa_mask); \ |
| act.sa_flags = SA_SIGINFO; \ |
| sigaction (SIGSEGV, &act, NULL); \ |
| } \ |
| while (0) |
| |
| #define INIT_FPE \ |
| do \ |
| { \ |
| struct sigaction act; \ |
| act.sa_sigaction = _Jv_catch_fpe; \ |
| sigemptyset (&act.sa_mask); \ |
| act.sa_flags = SA_SIGINFO; \ |
| sigaction (SIGFPE, &act, NULL); \ |
| } \ |
| while (0) |
| #endif /* __ia64__ || __sparc__ */ |
| #endif /* JAVA_SIGNAL_H */ |