97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
// sh-signal.h - Catch runtime signals and turn them into exceptions
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// on a SuperH based Linux system.
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/* Copyright (C) 2004 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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#define HANDLE_SEGV 1
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#define HANDLE_FPE 1
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/* The third parameter to the signal handler points to something with
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* this structure defined in asm/ucontext.h, but the name clashes with
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* struct ucontext from sys/ucontext.h so this private copy is used. */
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typedef struct _sig_ucontext {
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unsigned long uc_flags;
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struct _sig_ucontext *uc_link;
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stack_t uc_stack;
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struct sigcontext uc_mcontext;
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sigset_t uc_sigmask;
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} sig_ucontext_t;
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#define SIGNAL_HANDLER(_name) \
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static void _name (int , siginfo_t *, sig_ucontext_t *_uc)
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/* SH either leaves PC pointing at a faulting instruction or the
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following instruction, depending on the signal. SEGV always does
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the former, so we adjust the saved PC to point to the following
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instruction. This is what the handler in libgcc expects. */
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#ifdef __SH5__
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#define MAKE_THROW_FRAME(_exception) \
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do \
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{ \
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volatile struct sigcontext *_sc = &_uc->uc_mcontext; \
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_sc->sc_pc += 4; \
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} \
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while (0)
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#else
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#define MAKE_THROW_FRAME(_exception) \
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do \
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{ \
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volatile struct sigcontext *_sc = &_uc->uc_mcontext; \
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_sc->sc_pc += 2; \
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} \
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while (0)
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#endif
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/* For an explanation why we cannot simply use sigaction to
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install the handlers, see i386-signal.h. */
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/* We use kernel_old_sigaction here because we're calling the kernel
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directly rather than via glibc. The sigaction structure that the
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syscall uses is a different shape from the one in userland and not
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visible to us in a header file so we define it here. */
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struct kernel_old_sigaction {
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void (*k_sa_handler) (int, siginfo_t *, sig_ucontext_t *);
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unsigned long k_sa_mask;
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unsigned long k_sa_flags;
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void (*k_sa_restorer) (void);
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};
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#define INIT_SEGV \
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do \
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{ \
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struct kernel_old_sigaction kact; \
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kact.k_sa_handler = catch_segv; \
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kact.k_sa_mask = 0; \
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kact.k_sa_flags = SA_SIGINFO | SA_NODEFER; \
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syscall (SYS_sigaction, SIGSEGV, &kact, NULL); \
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} \
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while (0)
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#define INIT_FPE \
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do \
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{ \
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struct kernel_old_sigaction kact; \
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kact.k_sa_handler = catch_fpe; \
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kact.k_sa_mask = 0; \
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kact.k_sa_flags = SA_SIGINFO | SA_NODEFER; \
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syscall (SYS_sigaction, SIGFPE, &kact, NULL); \
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} \
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while (0)
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#endif /* JAVA_SIGNAL_H */
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