mips-signal.h: New file.

2003-10-22  David Daney  <ddaney@avtrex.com)

	* include/mips-signal.h: New file.
	* sysdep/dwarf2-backtrace.cc: New file.
	* sysdep/mips: New directory.
	* sysdep/mips/locks.h: New file.
	* Makefile.am(extra_cc_files): New, to allow extra c++ files to be
	added to libgcj.
	(extra_cc_source_files): Ditto.
	* configure.host(disable_dladdr):  New shell variable passed to
	configure.
	(mips*-*-linux*): sysdeps_dir=mips,
	can_unwind_signal=yes, disable_dladdr=yes, use -mxgot.
	(mipsel*-linux* | mipsisa32el*-linux*): Enable hash synchronization.
	* configure.in:(mips*-*-linux*): Use sysdep/dwarf2-backtrace.cc to
	generate backtrace, and include/mips-signal.h as SIGNAL_HANDLER
	(HAVE_DLADDR): Make it depend on setting of disable_dladdr.
	(EXTRA_CC_FILES): New, to support conditional addition of
	sysdep/dwarf2-backtrace.cc.
	* configure: Regenerated.
	* Makefile.in: Regenerated.
	* gcj/Makefile.in: Regenerated.
	* include/config.h.in: Regenerated.
	* include/Makefile.in: Regenerated.
	* testsuite/Makefile.in: Regenerated.

From-SVN: r72808

1 files changed, 89 insertions, 0 deletions

diff --git a/libjava/include/mips-signal.h b/libjava/include/mips-signal.h
new file mode 100644
index 0000000..6728197
--- /dev/null
+++ b/libjava/include/mips-signal.h
@@ -0,0 +1,89 @@
+// mips-signal.h - Catch runtime signals and turn them into exceptions
+// on an mips based Linux system. 
+
+/* Copyright (C) 1998, 1999, 2001, 2002, 2003  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.  */
+
+/* Adapted from sparc-signal.h and powerpc-signal.h
+   by David Daney <ddaney@avtrex.com> */
+
+#ifndef JAVA_SIGNAL_H
+#define JAVA_SIGNAL_H 1
+
+#include <signal.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+/* #include <asm/ucontext.h> structures we use are here but clash with
+   sys/ucontext.h included by java-signal.h from prims.cc */
+
+#define HANDLE_SEGV 1
+#undef HANDLE_FPE
+
+/* The third parameter to the signal handler points to something with
+ * this structure defined in asm/ucontext.h, but the name clashes with
+ * struct ucontext from sys/ucontext.h so this private copy is used. */
+typedef struct _sig_ucontext {
+    unsigned long	  uc_flags;
+    struct _sig_ucontext  *uc_link;
+    stack_t		  uc_stack;
+    struct sigcontext uc_mcontext;
+    sigset_t	  uc_sigmask;
+} sig_ucontext_t;
+
+/* We use kernel_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. */
+
+struct kernel_sigaction {
+    unsigned int k_sa_flags;
+    void       (*k_sa_handler) (int, siginfo_t *, sig_ucontext_t *);
+    sigset_t     k_sa_mask;
+    void       (*k_sa_restorer)(void);
+    int          k_sa_resv[1];	/* reserved */
+};
+
+
+
+#define SIGNAL_HANDLER(_name) \
+static void _name (int _dummy, siginfo_t *_info, sig_ucontext_t *_arg)
+
+/*
+ *  MIPS leaves pc pointing at the faulting instruction, but the
+ *  unwinder expects it to point to the following instruction
+ */
+
+#define MAKE_THROW_FRAME(_exception) \
+do                                   \
+{                                    \
+  _arg->uc_mcontext.sc_pc += 4;      \
+  (void)_dummy;                      \
+  (void)_info;                       \
+}                                    \
+while (0)
+
+/* For an explanation why we cannot simply use sigaction to
+   install the handlers, see i386-signal.h.  */
+
+#define INIT_SEGV                                    \
+do                                                   \
+  {                                                  \
+    struct kernel_sigaction kact;                    \
+    kact.k_sa_handler = catch_segv;                  \
+    kact.k_sa_flags = SA_SIGINFO | SA_NODEFER;       \
+    sigemptyset (&kact.k_sa_mask);                   \
+    syscall (SYS_sigaction, SIGSEGV, &kact, NULL);   \
+  }                                                  \
+while (0)
+								
+
+#endif /* JAVA_SIGNAL_H */
+