| // powerpc-signal.h - Catch runtime signals and turn them into exceptions |
| // on a powerpc based Linux system. |
| |
| /* Copyright (C) 2003, 2006 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 |
| #undef HANDLE_FPE |
| |
| #define SIGNAL_HANDLER(_name) \ |
| static void _name (int /* _signal */, struct sigcontext *_sc) |
| |
| /* MD_FALLBACK_FRAME_STATE_FOR takes care of special casing PC |
| before the faulting instruction, so we don't need to do anything |
| here. */ |
| |
| #define MAKE_THROW_FRAME(_exception) |
| |
| /* For an explanation why we cannot simply use sigaction to |
| install the handlers, see i386-signal.h. */ |
| |
| /* We use kernel_old_sigaction here because we're calling the kernel |
| directly rather than via glibc. The sigaction structure that the |
| syscall uses is a different shape from the one in userland and not |
| visible to us in a header file so we define it here. |
| Additionally we want a proper prototype for the handler function |
| with the struct sigcontext pointer passed by the kernel as the 2nd |
| argument, which isn't there in userland headers. |
| |
| Note that we explicitly avoid the SA_SIGINFO flag in INIT_SEGV and |
| INIT_FPE below. Using the ucontext pointer passed as 3rd argument |
| of a SA_SIGINFO type handler would need complicated backwards |
| compatibility hacks in MAKE_THROW_FRAME, as the ucontext layout |
| on PPC changed during the 2.5 kernel series. */ |
| |
| #ifndef __powerpc64__ |
| struct kernel_old_sigaction { |
| void (*k_sa_handler) (int, struct sigcontext *); |
| unsigned long k_sa_mask; |
| unsigned long k_sa_flags; |
| void (*k_sa_restorer) (void); |
| }; |
| |
| #define INIT_SEGV \ |
| do \ |
| { \ |
| struct kernel_old_sigaction kact; \ |
| kact.k_sa_handler = catch_segv; \ |
| kact.k_sa_mask = 0; \ |
| kact.k_sa_flags = 0; \ |
| if (syscall (SYS_sigaction, SIGSEGV, &kact, NULL) != 0) \ |
| __asm__ __volatile__ (".long 0"); \ |
| } \ |
| while (0) |
| |
| #define INIT_FPE \ |
| do \ |
| { \ |
| struct kernel_old_sigaction kact; \ |
| kact.k_sa_handler = catch_fpe; \ |
| kact.k_sa_mask = 0; \ |
| kact.k_sa_flags = 0; \ |
| if (syscall (SYS_sigaction, SIGFPE, &kact, NULL) != 0) \ |
| __asm__ __volatile__ (".long 0"); \ |
| } \ |
| while (0) |
| |
| #else /* powerpc64 */ |
| |
| struct kernel_sigaction |
| { |
| void (*k_sa_handler) (int, struct sigcontext *); |
| unsigned long k_sa_flags; |
| void (*k_sa_restorer)(void); |
| unsigned long k_sa_mask; |
| }; |
| |
| #define INIT_SEGV \ |
| do \ |
| { \ |
| struct kernel_sigaction kact; \ |
| memset (&kact, 0, sizeof (kact)); \ |
| kact.k_sa_handler = catch_segv; \ |
| if (syscall (SYS_rt_sigaction, SIGSEGV, &kact, NULL, 8) != 0) \ |
| __asm__ __volatile__ (".long 0"); \ |
| } \ |
| while (0) |
| |
| #define INIT_FPE \ |
| do \ |
| { \ |
| struct kernel_sigaction kact; \ |
| memset (&kact, 0, sizeof (kact)); \ |
| kact.k_sa_handler = catch_fpe; \ |
| if (syscall (SYS_rt_sigaction, SIGFPE, &kact, NULL, 8) != 0) \ |
| __asm__ __volatile__ (".long 0"); \ |
| } \ |
| while (0) |
| #endif |
| |
| #endif /* JAVA_SIGNAL_H */ |