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[pf3gnuchains/gcc-fork.git] / libjava / include / x86_64-signal.h
1 // x86_64-signal.h - Catch runtime signals and turn them into exceptions
2 // on an x86_64 based GNU/Linux system.
3
4 /* Copyright (C) 2003  Free Software Foundation
5
6    This file is part of libgcj.
7
8 This software is copyrighted work licensed under the terms of the
9 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
10 details.  */
11
12
13 #ifdef __x86_64__
14
15 #ifndef JAVA_SIGNAL_H
16 #define JAVA_SIGNAL_H 1
17
18 #include <signal.h>
19 #include <sys/syscall.h>
20
21 #define HANDLE_SEGV 1
22
23 #define SIGNAL_HANDLER(_name)   \
24 static void _Jv_##_name (int, siginfo_t *, void *_p)
25
26 extern "C" 
27 {
28   struct kernel_sigaction 
29   {
30     void (*k_sa_sigaction)(int,siginfo_t *,void *);
31     unsigned long k_sa_flags;
32     void (*k_sa_restorer) (void);
33     sigset_t k_sa_mask;
34   };
35 }
36
37 #define MAKE_THROW_FRAME(_exception)                                         \
38 do                                                                           \
39 {                                                                            \
40   /* Advance the program counter so that it is after the start of the        \
41      instruction:  the x86_64 exception handler expects                      \
42      the PC to point to the instruction after a call. */                     \
43   struct ucontext *_uc = (struct ucontext *)_p;                              \
44   _uc->uc_mcontext.gregs[REG_RIP] += 2;                                      \
45 }                                                                            \
46 while (0)
47
48 #define RESTORE(name, syscall) RESTORE2 (name, syscall)
49 #define RESTORE2(name, syscall)                 \
50 asm                                             \
51   (                                             \
52    ".text\n"                                    \
53    ".byte 0  # Yes, this really is necessary\n" \
54    ".align 16\n"                                \
55    "__" #name ":\n"                             \
56    "    movq $" #syscall ", %rax\n"             \
57    "    syscall\n"                              \
58    );
59
60 /* The return code for realtime-signals.  */
61 RESTORE (restore_rt, __NR_rt_sigreturn)
62 void restore_rt (void) asm ("__restore_rt")
63   __attribute__ ((visibility ("hidden")));
64
65 #define INIT_SEGV                                               \
66 do                                                              \
67   {                                                             \
68     struct kernel_sigaction act;                                \
69     act.k_sa_sigaction = _Jv_catch_segv;                        \
70     sigemptyset (&act.k_sa_mask);                               \
71     act.k_sa_flags = SA_SIGINFO|0x4000000;                      \
72     act.k_sa_restorer = restore_rt;                             \
73     syscall (SYS_rt_sigaction, SIGSEGV, &act, NULL, _NSIG / 8); \
74   }                                                             \
75 while (0)  
76
77 /* We use syscall(SYS_rt_sigaction) in INIT_SEGV instead of
78  * sigaction() because on some systems the pthreads wrappers for
79  * signal handlers are not compiled with unwind information, so it's
80  * not possible to unwind through them.  This is a problem that will
81  * go away if all systems ever have pthreads libraries that are
82  * compiled with unwind info.  */
83
84 #endif /* JAVA_SIGNAL_H */
85
86 #else /* __x86_64__ */
87
88 /* This is for the 32-bit subsystem on x86-64.  */
89
90 #define sigcontext_struct sigcontext
91 #include <java-signal-aux.h>
92
93 #endif /* __x86_64__ */