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9f47031337
2003-06-03 Andrew Haley <aph@redhat.com>
* include/x86_64-signal.h (MAKE_THROW_FRAME): Mark sigcontext on
stack volatile to prevent optimization from removing it.
From-SVN: r67379
97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
// x86_64-signal.h - Catch runtime signals and turn them into exceptions
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// on an x86_64 based GNU/Linux system.
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/* Copyright (C) 2003 Free Software Foundation
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This file is part of libgcj.
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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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#ifdef __x86_64__
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#define HANDLE_SEGV 1
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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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extern "C"
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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 MAKE_THROW_FRAME(_exception) \
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do \
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{ \
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/* Advance the program counter so that it is after the start of the \
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instruction: the x86_64 exception handler expects \
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the PC to point to the instruction after a call. */ \
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struct ucontext *_uc = (struct ucontext *)_p; \
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volatile struct sigcontext *_sc = (struct sigcontext *) &_uc->uc_mcontext; \
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_sc->rip += 2; \
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} \
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while (0)
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#define RESTORE(name, syscall) RESTORE2 (name, syscall)
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#define RESTORE2(name, syscall) \
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asm \
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( \
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".byte 0 # Yes, this really is necessary\n" \
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".align 16\n" \
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"__" #name ":\n" \
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" movq $" #syscall ", %rax\n" \
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" syscall\n" \
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);
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/* The return code for realtime-signals. */
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RESTORE (restore_rt, __NR_rt_sigreturn)
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static void restore_rt (void) asm ("__restore_rt");
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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 kernel_sigaction act; \
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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|0x4000000; \
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act.k_sa_restorer = restore_rt; \
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syscall (SYS_rt_sigaction, SIGSEGV, &act, NULL, _NSIG / 8); \
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} \
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while (0)
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/* We use syscall(SYS_rt_sigaction) in INIT_SEGV 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 if all systems ever have pthreads libraries that are
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* compiled with unwind info. */
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#else /* __x86_64__ */
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/* This is for the 32-bit subsystem on on x86-64. Catching signals
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doesn't yet work on that target. */
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#undef HANDLE_SEGV
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#undef HANDLE_FPE
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#define INIT_SEGV do {} while (0)
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#define INIT_FPE do {} while (0)
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#endif /* __x86_64__ */
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#endif /* JAVA_SIGNAL_H */
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