90 lines
3.0 KiB
C
90 lines
3.0 KiB
C
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// mips-signal.h - Catch runtime signals and turn them into exceptions
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// on an mips based Linux system.
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/* Copyright (C) 1998, 1999, 2001, 2002, 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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/* Adapted from sparc-signal.h and powerpc-signal.h
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by David Daney <ddaney@avtrex.com> */
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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 <unistd.h>
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#include <sys/syscall.h>
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/* #include <asm/ucontext.h> structures we use are here but clash with
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sys/ucontext.h included by java-signal.h from prims.cc */
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#define HANDLE_SEGV 1
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#undef HANDLE_FPE
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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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/* We use kernel_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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struct kernel_sigaction {
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unsigned int k_sa_flags;
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void (*k_sa_handler) (int, siginfo_t *, sig_ucontext_t *);
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sigset_t k_sa_mask;
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void (*k_sa_restorer)(void);
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int k_sa_resv[1]; /* reserved */
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};
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#define SIGNAL_HANDLER(_name) \
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static void _name (int _dummy, siginfo_t *_info, sig_ucontext_t *_arg)
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/*
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* MIPS leaves pc pointing at the faulting instruction, but the
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* unwinder expects it to point to the following instruction
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*/
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#define MAKE_THROW_FRAME(_exception) \
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do \
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{ \
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_arg->uc_mcontext.sc_pc += 4; \
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(void)_dummy; \
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(void)_info; \
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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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#define INIT_SEGV \
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do \
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{ \
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struct kernel_sigaction kact; \
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kact.k_sa_handler = catch_segv; \
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kact.k_sa_flags = SA_SIGINFO | SA_NODEFER; \
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sigemptyset (&kact.k_sa_mask); \
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syscall (SYS_sigaction, SIGSEGV, &kact, NULL); \
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} \
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while (0)
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#endif /* JAVA_SIGNAL_H */
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