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3cb2054594
2002-03-25 Andrew Haley <aph@cambridge.redhat.com>, Hans Boehm <Hans_Boehm@hp.com>
* include/dwarf2-signal.h (MAKE_THROW_FRAME): Add for IA-64.
(INIT_SEGV, INIT_FPE): Add versions that use __libc_sigaction
instead of syscall on IA-64.
Add FIXME comment.
From-SVN: r51459
141 lines
4.5 KiB
C++
141 lines
4.5 KiB
C++
// dwarf2-signal.h - Catch runtime signals and turn them into exceptions.
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/* Copyright (C) 2000, 2001 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 *, 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 __alpha__
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#define MAKE_THROW_FRAME(_exception) \
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do \
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{ \
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/* Alpha 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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struct sigcontext *_sc = (struct sigcontext *)_p; \
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_sc->sc_pc += 4; \
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} \
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while (0)
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#elif defined(__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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#ifndef __ia64__
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#define INIT_SEGV \
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do \
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{ \
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nullp = new java::lang::NullPointerException (); \
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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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arithexception = new java::lang::ArithmeticException \
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(JvNewStringLatin1 ("/ by zero")); \
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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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// FIXME: We shouldn't be using libc_sigaction here, since it should
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// be glibc private. But using syscall here would mean translating to
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// the kernel's struct sigaction and argument sequence, which we
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// shouldn't either. The right solution is to call sigaction and to
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// make sure that we can unwind correctly through the pthread signal
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// wrapper.
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extern "C" int __libc_sigaction (int __sig,
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__const struct sigaction *__restrict __act,
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struct sigaction *__restrict __oact) throw ();
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#define INIT_SEGV \
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do \
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{ \
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nullp = new java::lang::NullPointerException (); \
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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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__libc_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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arithexception = new java::lang::ArithmeticException \
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(JvNewStringLatin1 ("/ by zero")); \
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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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__libc_sigaction (SIGFPE, &act, NULL); \
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} \
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while (0)
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#endif /* __ia64__ */
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#endif /* JAVA_SIGNAL_H */
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