* configure.in, configure: enable dwarf2-exception-style

	exception handling on IA-64.
	* include/dwarf2-signal.h (MAKE_THROW_FRAME): Add for IA-64.
	(INIT_SEGV, INIT_FPE): Use __libc_sigaction instead of syscall.
	Add FIXME comment.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@51367 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/libjava/ChangeLog b/libjava/ChangeLog
index e7c780f..46a9085 100644 (file)
--- a/libjava/ChangeLog
+++ b/libjava/ChangeLog
@@ -1,3 +1,11 @@
+2002-03-25  Andrew Haley <aph@cambridge.redhat.com>, Hans Boehm <Hans_Boehm@hp.com>
+
+       * configure.in, configure: enable dwarf2-exception-style
+       exception handling on IA-64.
+       * include/dwarf2-signal.h (MAKE_THROW_FRAME): Add for IA-64.
+       (INIT_SEGV, INIT_FPE): Use __libc_sigaction instead of syscall.
+       Add FIXME comment.
+       
 2002-03-25  Tom Tromey  <tromey@redhat.com>
 
        * Makefile.am (libgcj_la_LDFLAGS): Use THREADLDFLAGS.

diff --git a/libjava/configure b/libjava/configure
index 5fd51a1..f86c865 100755 (executable)
--- a/libjava/configure
+++ b/libjava/configure
@@ -6400,6 +6400,9 @@ case "${host}" in
 #    SYSDEP_SOURCES=sysdep/ia64.c
 #    test -d sysdep || mkdir sysdep
 #    ;;
+ ia64-*-linux*)
+    SIGNAL_HANDLER=include/dwarf2-signal.h
+    ;;
  powerpc-*-linux*)
     SIGNAL_HANDLER=include/dwarf2-signal.h
     ;;

diff --git a/libjava/configure.in b/libjava/configure.in
index 4ca3930..ba96495 100644 (file)
--- a/libjava/configure.in
+++ b/libjava/configure.in
@@ -852,6 +852,9 @@ case "${host}" in
 #    SYSDEP_SOURCES=sysdep/ia64.c
 #    test -d sysdep || mkdir sysdep
 #    ;;
+ ia64-*-linux*)
+    SIGNAL_HANDLER=include/dwarf2-signal.h
+    ;;
  powerpc-*-linux*)
     SIGNAL_HANDLER=include/dwarf2-signal.h
     ;;

diff --git a/libjava/include/dwarf2-signal.h b/libjava/include/dwarf2-signal.h
index 3a662ae..f1572d3 100644 (file)
--- a/libjava/include/dwarf2-signal.h
+++ b/libjava/include/dwarf2-signal.h
@@ -41,7 +41,25 @@ do                                                                   \
   _sc->sc_pc += 4;                                                     \
 }                                                                      \
 while (0)
+
+#elif defined(__ia64__)
+
+#define MAKE_THROW_FRAME(_exception)                                   \
+do                                                                     \
+{                                                                      \
+  /* IA-64 either leaves PC pointing at a faulting instruction or the  \
+   following instruction, depending on the signal.  SEGV always does   \
+   the former, so we adjust the saved PC to point to the following     \
+   instruction; this is what the handler in libgcc expects.  */                \
+  /* Note that we are lying to the unwinder here, which expects the    \
+   faulting pc, not pc+1.  But we claim the unwind information can't   \
+   be changed by such a ld or st instruction, so it doesn't matter. */ \
+  struct sigcontext *_sc = (struct sigcontext *)_p;                    \
+  _sc->sc_ip++;                                                                \
+}                                                                      \
+while (0)
 #else
+#error
 #define MAKE_THROW_FRAME(_exception)           \
 do                                             \
 {                                              \
@@ -50,6 +68,16 @@ do                                           \
 while (0)
 #endif
 
+// FIXME: We shouldn't be using libc_sigaction here, since it should
+// be glibc private.  But using syscall here would mean translating to
+// the kernel's struct sigaction and argument sequence, which we
+// shouldn't either.  The right solution is to call sigaction and to
+// make sure that we can unwind correctly through the pthread signal
+// wrapper.
+extern "C" int __libc_sigaction (int __sig, 
+                     __const struct sigaction *__restrict __act,
+                      struct sigaction *__restrict __oact) throw ();
+
 #define INIT_SEGV                                              \
 do                                                             \
   {                                                            \
@@ -58,7 +86,7 @@ do                                                            \
     act.sa_sigaction = _Jv_catch_segv;                         \
     sigemptyset (&act.sa_mask);                                        \
     act.sa_flags = SA_SIGINFO;                                 \
-    syscall (SYS_sigaction, SIGSEGV, &act, NULL);              \
+    __libc_sigaction (SIGSEGV, &act, NULL);            \
   }                                                            \
 while (0)  
 
@@ -71,7 +99,7 @@ do                                                            \
     act.sa_sigaction = _Jv_catch_fpe;                          \
     sigemptyset (&act.sa_mask);                                        \
     act.sa_flags = SA_SIGINFO;                                 \
-    syscall (SYS_sigaction, SIGFPE, &act, NULL);               \
+    __libc_sigaction (SIGFPE, &act, NULL);             \
   }                                                            \
 while (0)