+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNU ADA 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 --
--- --
--- $Revision: 1.2 $
--- --
--- Copyright (C) 1991-2001, Florida State University --
--- --
--- 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- --
--- ware Foundation; either version 2, or (at your option) any later ver- --
--- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
--- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
--- 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. --
--- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
--- --
--- GNARL was developed by the GNARL team at Florida State University. It is --
--- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
--- State University (http://www.gnat.com). --
--- --
-------------------------------------------------------------------------------
-
--- This is the default version of this package
-
--- This is a Sun OS (FSU THREADS) version of this package
-
--- PLEASE DO NOT add any dependences on other packages. ??? why not ???
--- This package is designed to work with or without tasking support.
-
--- See the other warnings in the package specification before making
--- any modifications to this file.
-
--- Make a careful study of all signals available under the OS, to see which
--- need to be reserved, kept always unmasked, or kept always unmasked. Be on
--- the lookout for special signals that may be used by the thread library.
-
--- Since this is a multi target file, the signal <-> exception mapping
--- is simple minded. If you need a more precise and target specific
--- signal handling, create a new s-intman.adb that will fit your needs.
-
--- This file assumes that:
---
--- SIGFPE, SIGILL, SIGSEGV and SIGBUS exist. They are mapped as follows:
--- SIGPFE => Constraint_Error
--- SIGILL => Program_Error
--- SIGSEGV => Storage_Error
--- SIGBUS => Storage_Error
---
--- SIGINT exists and will be kept unmasked unless the pragma
--- Unreserve_All_Interrupts is specified anywhere in the application.
---
--- System.OS_Interface contains the following:
--- SIGADAABORT: the signal that will be used to abort tasks.
--- Unmasked: the OS specific set of signals that should be unmasked in
--- all the threads. SIGADAABORT is unmasked by
--- default
--- Reserved: the OS specific set of signals that are reserved.
-
-with Interfaces.C;
--- used for int and other types
-
-with System.OS_Interface;
--- used for various Constants, Signal and types
-
-package body System.Interrupt_Management is
-
- use Interfaces.C;
- use System.OS_Interface;
-
- type Interrupt_List is array (Interrupt_ID range <>) of Interrupt_ID;
- Exception_Interrupts : constant Interrupt_List :=
- (SIGFPE, SIGILL, SIGSEGV, SIGBUS);
-
- Unreserve_All_Interrupts : Interfaces.C.int;
- pragma Import
- (C, Unreserve_All_Interrupts, "__gl_unreserve_all_interrupts");
-
- -----------------------
- -- Local Subprograms --
- -----------------------
-
- procedure Notify_Exception (signo : Signal);
- -- 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
- -- has to be provided for different target.
-
- ----------------------
- -- Notify_Exception --
- ----------------------
-
- Signal_Mask : aliased sigset_t;
- -- The set of signals handled by Notify_Exception
-
- procedure Notify_Exception (signo : Signal) is
- Result : Interfaces.C.int;
-
- begin
- -- With the __builtin_longjmp, the signal mask is not restored, so we
- -- need to restore it explicitly.
-
- Result := pthread_sigmask (SIG_UNBLOCK, Signal_Mask'Access, null);
- pragma Assert (Result = 0);
-
- -- Check that treatment of exception propagation here
- -- is consistent with treatment of the abort signal in
- -- System.Task_Primitives.Operations.
-
- case signo is
- when SIGFPE =>
- raise Constraint_Error;
- when SIGILL =>
- raise Program_Error;
- when SIGSEGV =>
- raise Storage_Error;
- when SIGBUS =>
- raise Storage_Error;
- when others =>
- null;
- 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 --
--------------------------
-
-begin
- declare
- act : aliased struct_sigaction;
- old_act : aliased struct_sigaction;
- Result : Interfaces.C.int;
-
- begin
- -- Need to call pthread_init very early because it is doing signal
- -- initializations.
-
- pthread_init;
-
- Abort_Task_Interrupt := SIGADAABORT;
-
- act.sa_handler := Notify_Exception'Address;
-
- act.sa_flags := 0;
-
- -- 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
- -- the Signal.
-
- -- This is a temporary fix to the problem that the Signal_Mask is
- -- not restored after the exception (longjmp) from the handler.
- -- The right fix should be made in sigsetjmp so that we save
- -- the Signal_Set and restore it after a longjmp.
-
- -- Since SA_NODEFER is obsolete, instead we reset explicitly
- -- the mask in the exception handler.
-
- Result := sigemptyset (Signal_Mask'Access);
- pragma Assert (Result = 0);
-
- -- ??? For the same reason explained above, we can't mask these
- -- signals because otherwise we won't be able to catch more than
- -- one signal.
-
- act.sa_mask := Signal_Mask;
-
- Keep_Unmasked (Abort_Task_Interrupt) := True;
- Keep_Unmasked (SIGXCPU) := True;
- Keep_Unmasked (SIGFPE) := True;
- Result :=
- sigaction
- (Signal (SIGFPE), act'Unchecked_Access,
- old_act'Unchecked_Access);
- pragma Assert (Result = 0);
-
- -- By keeping SIGINT unmasked, allow the user to do a Ctrl-C, but at
- -- the same time, disable the ability of handling this signal via
- -- package Ada.Interrupts.
-
- -- The pragma Unreserve_All_Interrupts let the user the ability to
- -- change this behavior.
-
- if Unreserve_All_Interrupts = 0 then
- Keep_Unmasked (SIGINT) := True;
- end if;
-
- for J in
- Exception_Interrupts'First + 1 .. Exception_Interrupts'Last
- loop
- Keep_Unmasked (Exception_Interrupts (J)) := True;
-
- if Unreserve_All_Interrupts = 0 then
- Result :=
- sigaction
- (Signal (Exception_Interrupts (J)), act'Unchecked_Access,
- old_act'Unchecked_Access);
- pragma Assert (Result = 0);
- end if;
- end loop;
-
- for J in Unmasked'Range loop
- Keep_Unmasked (Interrupt_ID (Unmasked (J))) := True;
- end loop;
-
- Reserve := Keep_Unmasked or Keep_Masked;
-
- for J in Reserved'Range loop
- Reserve (Interrupt_ID (Reserved (J))) := True;
- end loop;
-
- -- We do not have Signal 0 in reality. We just use this value
- -- to identify non-existent signals (see s-intnam.ads). Therefore,
- -- Signal 0 should not be used in all signal related operations hence
- -- mark it as reserved.
-
- Reserve (0) := True;
- end;
-end System.Interrupt_Management;
projects / msp430-gcc.git / blobdiff