gcc/libjava/include/x86_64-signal.h

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// 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. */
#ifdef __x86_64__
#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 *, 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; \
volatile 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 \
{ \
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 */
#else /* __x86_64__ */
/* This is for the 32-bit subsystem on x86-64. */
#define sigcontext_struct sigcontext
#include <java-signal-aux.h>
#endif /* __x86_64__ */