------------------------------------------------------------------------------
-- --
--- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
+-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . I N T E R R U P T _ M A N A G E M E N T --
-- --
-- B o d y --
-- --
--- Copyright (C) 1992-2003, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2005, Free Software Foundation, Inc. --
-- --
-- GNARL is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNARL; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- Local Subprograms --
-----------------------
- procedure Notify_Exception (signo : Signal);
+ procedure Notify_Exception
+ (signo : Signal;
+ siginfo : System.Address;
+ ucontext : System.Address);
-- This function identifies the Ada exception to be raised using
-- the information when the system received a synchronous signal.
-- Since this function is machine and OS dependent, different code
Signal_Mask : aliased sigset_t;
-- The set of signals handled by Notify_Exception
- procedure Notify_Exception (signo : Signal) is
+ procedure Notify_Exception
+ (signo : Signal;
+ siginfo : System.Address;
+ ucontext : System.Address)
+ is
+ pragma Unreferenced (siginfo);
+
+ -- The GCC unwinder requires adjustments to the signal's machine
+ -- context to be able to properly unwind through the signal handler.
+ -- This is achieved by the target specific subprogram below, provided
+ -- by init.c to be usable by the non-tasking handler also.
+
+ procedure Adjust_Context_For_Raise
+ (signo : Signal;
+ ucontext : System.Address);
+ pragma Import
+ (C, Adjust_Context_For_Raise, "__gnat_adjust_context_for_raise");
+
Result : Interfaces.C.int;
begin
Result := pthread_sigmask (SIG_UNBLOCK, Signal_Mask'Access, null);
pragma Assert (Result = 0);
+ -- Perform the necessary context adjustments required by the GCC/ZCX
+ -- unwinder, harmless in the SJLJ case.
+
+ Adjust_Context_For_Raise (signo, ucontext);
+
-- Check that treatment of exception propagation here
-- is consistent with treatment of the abort signal in
-- System.Task_Primitives.Operations.
end case;
end Notify_Exception;
- ---------------------------
- -- Initialize_Interrupts --
- ---------------------------
-
- -- Nothing needs to be done on this platform.
-
- procedure Initialize_Interrupts is
- begin
- null;
- end Initialize_Interrupts;
-
-------------------------
-- Package Elaboration --
-------------------------
-- Setting SA_SIGINFO asks the kernel to pass more than just the signal
-- number argument to the handler when it is called. The set of extra
- -- parameters typically includes a pointer to a structure describing
- -- the interrupted context. Although the Notify_Exception handler does
- -- not use this information, it is actually required for the GCC/ZCX
- -- exception propagation scheme because on some targets (at least
- -- alpha-tru64), the structure contents are not even filled when this
- -- flag is not set.
+ -- parameters includes a pointer to the interrupted context, which the
+ -- ZCX propagation scheme needs.
+
+ -- Most man pages for sigaction mention that sa_sigaction should be set
+ -- instead of sa_handler when SA_SIGINFO is on. In practice, the two
+ -- fields are actually union'ed and located at the same offset.
-- On some targets, we set sa_flags to SA_NODEFER so that during the
-- handler execution we do not change the Signal_Mask to be masked for
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