+++ /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: 1.1.16.1 $
--- --
--- 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 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.
-
--- 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.
-
-with Interfaces.C;
--- used for int
-
-with System.Error_Reporting;
--- used for Shutdown
-
-with System.OS_Interface;
--- used for various Constants, Signal and types
-
-package body System.Interrupt_Management is
-
- use Interfaces.C;
- use System.Error_Reporting;
- use System.OS_Interface;
-
- type Interrupt_List is array (Interrupt_ID range <>) of Interrupt_ID;
- Exception_Interrupts : constant Interrupt_List :=
- (SIGFPE, SIGILL, SIGSEGV);
-
- Unreserve_All_Interrupts : Interfaces.C.int;
- pragma Import
- (C, Unreserve_All_Interrupts, "__gl_unreserve_all_interrupts");
-
- -----------------------
- -- Local Subprograms --
- -----------------------
-
- procedure Notify_Exception
- (signo : Signal;
- info : access siginfo_t;
- context : access struct_sigcontext);
- -- 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 --
- ----------------------
-
- -- The following code is intended for SunOS on Sparcstation.
-
- procedure Notify_Exception
- (signo : Signal;
- info : access siginfo_t;
- context : access struct_sigcontext)
- is
- begin
- -- As long as we are using a longjmp to return control to the
- -- exception handler on the runtime stack, we are safe. The original
- -- signal mask (the one we had before coming into this signal catching
- -- function) will be restored by the longjmp. Therefore, raising
- -- an exception in this handler should be a safe operation.
-
- -- 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 =>
- case info.si_code is
- when FPE_INTOVF_TRAP |
- FPE_STARTSIG_TRAP |
- FPE_INTDIV_TRAP |
- FPE_FLTDIV_TRAP |
- FPE_FLTUND_TRAP |
- FPE_FLTOPERR_TRAP |
- FPE_FLTOVF_TRAP =>
- raise Constraint_Error;
-
- when others =>
- pragma Assert (Shutdown ("Unexpected SIGFPE signal"));
- null;
- end case;
-
- when SIGILL =>
- case info.si_code is
- when ILL_STACK |
- ILL_ILLINSTR_FAULT |
- ILL_PRIVINSTR_FAULT =>
- raise Constraint_Error;
-
- when others =>
- pragma Assert (Shutdown ("Unexpected SIGILL signal"));
- null;
- end case;
-
- when SIGSEGV =>
-
- -- was caused by accessing a null pointer.
-
--- ???? Origin of this code is unclear, may be broken ???
-
- if context.sc_o0 in 0 .. 16#2000# then
- raise Constraint_Error;
- else
- raise Storage_Error;
- end if;
-
- when others =>
- pragma Assert (Shutdown ("Unexpected signal"));
- 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;
- mask : aliased sigset_t;
- Result : Interfaces.C.int;
-
- begin
- -- Need to call pthread_init very early because it is doing signal
- -- initializations.
-
- pthread_init;
-
- -- Change the following assignment to use another signal for task abort.
- -- For example, SIGTERM might be a good one if SIGABRT is required for
- -- use elsewhere.
-
- Abort_Task_Interrupt := SIGABRT;
-
- act.sa_handler := Notify_Exception'Address;
-
- -- 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.
-
- -- In that case, this field should be changed back to 0. ???
-
- act.sa_flags := 16;
-
- Result := sigemptyset (mask'Access);
- pragma Assert (Result = 0);
-
- for J in Exception_Interrupts'Range loop
- Result := sigaddset (mask'Access, Signal (Exception_Interrupts (J)));
- pragma Assert (Result = 0);
- end loop;
-
- act.sa_mask := mask;
-
- for J in Exception_Interrupts'Range 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;
-
- Keep_Unmasked (Abort_Task_Interrupt) := True;
- Keep_Unmasked (SIGBUS) := True;
- Keep_Unmasked (SIGFPE) := True;
- Result :=
- sigaction
- (Signal (SIGFPE), act'Unchecked_Access,
- old_act'Unchecked_Access);
-
- Keep_Unmasked (SIGALRM) := True;
- Keep_Unmasked (SIGSTOP) := True;
- Keep_Unmasked (SIGKILL) := True;
- Keep_Unmasked (SIGXCPU) := True;
-
- -- By keeping SIGINT unmasked, allow the user to do a Ctrl-C, but at
- -- the same time, disable the ability of handling this signal using
- -- package Ada.Interrupts.
-
- -- The pragma Unreserve_All_Interrupts allows the user the ability to
- -- change this behavior.
-
- if Unreserve_All_Interrupts = 0 then
- Keep_Unmasked (SIGINT) := True;
- end if;
-
- -- Reserve this not to interfere with thread scheduling
-
- -- ??? consider adding this to interrupt exceptions
- -- Keep_Unmasked (SIGALRM) := True;
-
- -- An earlier version had a comment about SIGALRM needing to be unmasked
- -- in at least one thread for cond_timedwait to work.
-
- -- It is unclear whether this is True for Solaris threads, FSU threads,
- -- both, or maybe just an old version of FSU threads. ????
-
- -- Following signals should not be disturbed. Found by experiment
-
- Keep_Unmasked (SIGEMT) := True;
- Keep_Unmasked (SIGCHLD) := True;
-
- -- We do not have Signal 0 in reality. We just use this value
- -- to identify not existing signals (see s-intnam.ads). Therefore,
- -- Signal 0 should not be used in all signal related operations hence
- -- mark it as reserved.
-
- Reserve := Reserve or Keep_Unmasked or Keep_Masked;
- Reserve (0) := True;
- end;
-end System.Interrupt_Management;
projects / msp430-gcc.git / blobdiff