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