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85 lines
2.6 KiB
C
85 lines
2.6 KiB
C
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// powerpc-signal.h - Catch runtime signals and turn them into exceptions
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// on a powerpc based Linux system.
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/* Copyright (C) 2003 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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# undef HANDLE_FPE
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# define SIGNAL_HANDLER(_name) \
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static void _name (int /* _signal */, struct sigcontext *_sc)
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/* PPC 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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# define MAKE_THROW_FRAME(_exception) \
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do \
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{ \
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_sc->regs->nip += 4; \
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} \
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while (0)
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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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Additionally we want a proper prototype for the handler function
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with the struct sigcontext pointer passed by the kernel as the 2nd
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argument, which isn't there in userland headers.
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Note that we explicitly avoid the SA_SIGINFO flag in INIT_SEGV and
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INIT_FPE below. Using the ucontext pointer passed as 3rd argument
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of a SA_SIGINFO type handler would need complicated backwards
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compatibility hacks in MAKE_THROW_FRAME, as the ucontext layout
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on PPC changed during the 2.5 kernel series. */
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struct kernel_old_sigaction {
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void (*k_sa_handler) (int, struct sigcontext *);
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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 = 0; \
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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 = 0; \
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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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