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Diffstat (limited to 'libjava/include/x86_64-signal.h')
| -rw-r--r-- | libjava/include/x86_64-signal.h | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/libjava/include/x86_64-signal.h b/libjava/include/x86_64-signal.h new file mode 100644 index 00000000000..c368dd31e87 --- /dev/null +++ b/libjava/include/x86_64-signal.h @@ -0,0 +1,83 @@ +// x86_64-signal.h - Catch runtime signals and turn them into exceptions +// on an x86_64 based GNU/Linux system. + +/* Copyright (C) 2003 Free Software Foundation + + This file is part of libgcj. + +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 + +#define SIGNAL_HANDLER(_name) \ +static void _Jv_##_name (int, siginfo_t *_sip, void *_p) + +extern "C" +{ + 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 MAKE_THROW_FRAME(_exception) \ +do \ +{ \ + /* Advance the program counter so that it is after the start of the \ + instruction: the x86_64 exception handler expects \ + the PC to point to the instruction after a call. */ \ + struct ucontext *_uc = (struct ucontext *)_p; \ + struct sigcontext *_sc = (struct sigcontext *) &_uc->uc_mcontext; \ + _sc->rip += 2; \ +} \ +while (0) + +#define RESTORE(name, syscall) RESTORE2 (name, syscall) +#define RESTORE2(name, syscall) \ +asm \ + ( \ + ".byte 0 # Yes, this really is necessary\n" \ + ".align 16\n" \ + "__" #name ":\n" \ + " movq $" #syscall ", %rax\n" \ + " syscall\n" \ + ); + +/* The return code for realtime-signals. */ +RESTORE (restore_rt, __NR_rt_sigreturn) +static void restore_rt (void) asm ("__restore_rt"); + +#define INIT_SEGV \ +do \ + { \ + nullp = new java::lang::NullPointerException (); \ + struct kernel_sigaction act; \ + act.k_sa_sigaction = _Jv_catch_segv; \ + sigemptyset (&act.k_sa_mask); \ + act.k_sa_flags = SA_SIGINFO|0x4000000; \ + act.k_sa_restorer = restore_rt; \ + syscall (SYS_rt_sigaction, SIGSEGV, &act, NULL, _NSIG / 8); \ + } \ +while (0) + +/* We use syscall(SYS_rt_sigaction) in INIT_SEGV 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 if all systems ever have pthreads libraries that are + * compiled with unwind info. */ + +#endif /* JAVA_SIGNAL_H */ + |
