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Diffstat (limited to 'libjava/include/dwarf2-signal.h')
| -rw-r--r-- | libjava/include/dwarf2-signal.h | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/libjava/include/dwarf2-signal.h b/libjava/include/dwarf2-signal.h new file mode 100644 index 000000000..812968217 --- /dev/null +++ b/libjava/include/dwarf2-signal.h @@ -0,0 +1,196 @@ +// dwarf2-signal.h - Catch runtime signals and turn them into exceptions. + +/* Copyright (C) 2000, 2001, 2009 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 */ |