re PR other/26208 (Serious problem with unwinding through signal frames)

	PR other/26208
	* unwind-dw2.c (struct _Unwind_Context): Add signal_frame field.
	(extract_cie_info): Handle S flag in augmentation string.
	(execute_cfa_program): If context->signal_frame, execute also
	fs->pc == context->ra instructions.
	(uw_frame_state_for): If context->signal_frame, don't subtract one
	from context->ra to find FDE.
	(uw_update_context_1): Set context->signal_frame to
	fs->signal_frame.
	(_Unwind_GetIPInfo): New function.
	* unwind-dw2.h (_Unwind_FrameState): Add signal_frame field.
	* unwind-c.c (PERSONALITY_FUNCTION): Use _Unwind_GetIPInfo instead
	of _Unwind_GetIP.
	* unwind-sjlj.c (_Unwind_GetIPInfo): New function.
	* unwind-generic.h (_Unwind_GetIPInfo): New prototype.
	* unwind-compat.c (_Unwind_GetIPInfo): New function.
	* libgcc-std.ver (_Unwind_GetIPInfo): Export @@GCC_4.2.0.
	* config/ia64/unwind-ia64.c (_Unwind_GetIPInfo): New function.
	* config/arm/unwind-arm.h (_Unwind_GetIPInfo): Define.
	* config/i386/linux-unwind.h (x86_fallback_frame_state,
	x86_64_fallback_frame_state): Set fs->signal_frame.
	* config/rs6000/linux-unwind.h (ppc_fallback_frame_state): Likewise.
	(MD_FROB_UPDATE_CONTEXT): Define unconditionally.
	(frob_update_context): Likewise.  Workaround missing S flag in
	Linux 2.6.12 - 2.6.16 kernel vDSOs.
	* config/s390/linux-unwind.h (s390_fallback_frame_state): Likewise.
	Remove the psw_addr + 1 hack.
libjava/
	* exception.cc (PERSONALITY_FUNCTION): Use _Unwind_GetIPInfo instead
	of _Unwind_GetIP.
	* include/i386-signal.h (MAKE_THROW_FRAME): Change into empty macro.
	(HANDLE_DIVIDE_OVERFLOW): Don't adjust _res->eip if falling through
	to throw.
	* include/x86_64-signal.h (MAKE_THROW_FRAME): Change into empty
	macro.
	* include/powerpc-signal.h (MAKE_THROW_FRAME): Change into empty
	macro.
libstdc++-v3/
	* libsupc++/eh_personality.cc (PERSONALITY_FUNCTION): Use
	_Unwind_GetIPInfo instead of _Unwind_GetIP.

From-SVN: r111488

3 files changed, 10 insertions, 45 deletions

diff --git a/libjava/include/i386-signal.h b/libjava/include/i386-signal.h
index a5c8ae4..a30ceeb 100644
--- a/libjava/include/i386-signal.h
+++ b/libjava/include/i386-signal.h
@@ -1,7 +1,7 @@
 // i386-signal.h - Catch runtime signals and turn them into exceptions
 // on an i386 based Linux system.
 
-/* Copyright (C) 1998, 1999, 2001, 2002  Free Software Foundation
+/* Copyright (C) 1998, 1999, 2001, 2002, 2006  Free Software Foundation
 
    This file is part of libgcj.
 
@@ -22,19 +22,7 @@ details.  */
 #define SIGNAL_HANDLER(_name)	\
 static void _name (int _dummy __attribute__ ((__unused__)))
 
-#define MAKE_THROW_FRAME(_exception)					\
-do									\
-{									\
-  void **_p = (void **)&_dummy;						\
-  volatile struct sigcontext_struct *_regs = (struct sigcontext_struct *)++_p;	\
-									\
-  /* Advance the program counter so that it is after the start of the	\
-     instruction:  the x86 exception handler expects			\
-     the PC to point to the instruction after a call. */		\
-  _regs->eip += 2;							\
-									\
-}									\
-while (0)
+#define MAKE_THROW_FRAME(_exception)
 
 #define HANDLE_DIVIDE_OVERFLOW						\
 do									\
@@ -91,14 +79,6 @@ do									\
 	  _regs->eip = (unsigned long)_eip;				\
 	  return;							\
 	}								\
-      else								\
-	{								\
-	  /* Advance the program counter so that it is after the start	\
-	     of the instruction: this is because the x86 exception	\
-	     handler expects the PC to point to the instruction after a	\
-	     call. */							\
-	  _regs->eip += 2;						\
-	}								\
     }									\
 }									\
 while (0)
diff --git a/libjava/include/powerpc-signal.h b/libjava/include/powerpc-signal.h
index 0d5a662..66133e9 100644
--- a/libjava/include/powerpc-signal.h
+++ b/libjava/include/powerpc-signal.h
@@ -1,7 +1,7 @@
 // powerpc-signal.h - Catch runtime signals and turn them into exceptions
 // on a powerpc based Linux system.
 
-/* Copyright (C) 2003  Free Software Foundation
+/* Copyright (C) 2003, 2006  Free Software Foundation
 
    This file is part of libgcj.
 
@@ -22,18 +22,12 @@ details.  */
 #define SIGNAL_HANDLER(_name)						\
   static void _name (int /* _signal */, struct sigcontext *_sc)
 
-/* PPC 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.  */
+/* MD_FALBACK_FRAME_STATE_FOR takes care of special casing PC
+   before the faulting instruction, so we don't need to do anything
+   here.  */
+
+#define MAKE_THROW_FRAME(_exception)
 
-#define MAKE_THROW_FRAME(_exception)					\
-do									\
-  {									\
-    _sc->regs->nip += 4;						\
-  }									\
-while (0)
-  
 /* For an explanation why we cannot simply use sigaction to
    install the handlers, see i386-signal.h.  */
 
diff --git a/libjava/include/x86_64-signal.h b/libjava/include/x86_64-signal.h
index f6df7d7..b4b4c2b 100644
--- a/libjava/include/x86_64-signal.h
+++ b/libjava/include/x86_64-signal.h
@@ -1,7 +1,7 @@
 // x86_64-signal.h - Catch runtime signals and turn them into exceptions
 // on an x86_64 based GNU/Linux system.
 
-/* Copyright (C) 2003  Free Software Foundation
+/* Copyright (C) 2003, 2006  Free Software Foundation
 
    This file is part of libgcj.
 
@@ -34,16 +34,7 @@ extern "C"
   };
 }
 
-#define MAKE_THROW_FRAME(_exception)					     \
-do									     \
-{									     \
-  /* Advance the program counter so that it is after the start of the	     \
-     instruction:  the x86_64 exception handler expects			     \
-     the PC to point to the instruction after a call. */		     \
-  struct ucontext *_uc = (struct ucontext *)_p;				     \
-  _uc->uc_mcontext.gregs[REG_RIP] += 2;				     	     \
-}									     \
-while (0)
+#define MAKE_THROW_FRAME(_exception)
 
 #define RESTORE(name, syscall) RESTORE2 (name, syscall)
 #define RESTORE2(name, syscall)			\