summaryrefslogtreecommitdiff
path: root/gcc/ada/5uintman.adb
diff options
context:
space:
mode:
Diffstat (limited to 'gcc/ada/5uintman.adb')
-rw-r--r--gcc/ada/5uintman.adb269
1 files changed, 269 insertions, 0 deletions
diff --git a/gcc/ada/5uintman.adb b/gcc/ada/5uintman.adb
new file mode 100644
index 00000000000..9b11d3baa8e
--- /dev/null
+++ b/gcc/ada/5uintman.adb
@@ -0,0 +1,269 @@
+------------------------------------------------------------------------------
+-- --
+-- 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: 1.15 $ --
+-- --
+-- 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;