+++ /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: 1.3 $
--- --
--- 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 GNU/Linux version of this package
-
--- This file performs the system-dependent translation between machine
--- exceptions and the Ada exceptions, if any, that should be raised when they
--- occur. This version works for the x86 running linux.
-
--- 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.
-
--- The definitions of "reserved" differ slightly between the ARM and POSIX.
--- Here is the ARM definition of reserved interrupt:
-
--- The set of reserved interrupts is implementation defined. A reserved
--- interrupt is either an interrupt for which user-defined handlers are not
--- supported, or one which already has an attached handler by some other
--- implementation-defined means. Program units can be connected to
--- non-reserved interrupts.
-
--- POSIX.5b/.5c specifies further:
-
--- Signals which the application cannot accept, and for which the application
--- cannot modify the signal action or masking, because the signals are
--- reserved for use by the Ada language implementation. The reserved signals
--- defined by this standard are Signal_Abort, Signal_Alarm,
--- Signal_Floating_Point_Error, Signal_Illegal_Instruction,
--- Signal_Segmentation_Violation, Signal_Bus_Error. If the implementation
--- supports any signals besides those defined by this standard, the
--- implementation may also reserve some of those.
-
--- The signals defined by POSIX.5b/.5c that are not specified as being
--- reserved are SIGHUP, SIGINT, SIGPIPE, SIGQUIT, SIGTERM, SIGUSR1, SIGUSR2,
--- SIGCHLD, SIGCONT, SIGSTOP, SIGTSTP, SIGTTIN, SIGTTOU, SIGIO SIGURG, and all
--- the real-time signals.
-
--- Beware of reserving signals that POSIX.5b/.5c require to be available for
--- users. POSIX.5b/.5c say:
-
--- An implementation shall not impose restrictions on the ability of an
--- application to send, accept, block, or ignore the signals defined by this
--- standard, except as specified in this standard.
-
--- Here are some other relevant requirements from POSIX.5b/.5c:
-
--- For the environment task, the initial signal mask is that specified for
--- the process...
-
--- It is anticipated that the paragraph above may be modified by a future
--- revision of this standard, to require that the realtime signals always be
--- initially masked for a process that is an Ada active partition.
-
--- For all other tasks, the initial signal mask shall include all the signals
--- that are not reserved signals and are not bound to entries of the task.
-
-with Interfaces.C;
--- used for int and other types
-
-with System.Error_Reporting;
--- used for Shutdown
-
-with System.OS_Interface;
--- used for various Constants, Signal and types
-
-with Ada.Exceptions;
--- used for Exception_Id
--- Raise_From_Signal_Handler
-
-with System.Soft_Links;
--- used for Get_Machine_State_Addr
-
-with Unchecked_Conversion;
-
-package body System.Interrupt_Management is
-
- use Interfaces.C;
- use System.Error_Reporting;
- use System.OS_Interface;
-
- package TSL renames System.Soft_Links;
-
- 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");
-
- subtype int is Interfaces.C.int;
- subtype unsigned_short is Interfaces.C.unsigned_short;
- subtype unsigned_long is Interfaces.C.unsigned_long;
-
- ----------------------
- -- Notify_Exception --
- ----------------------
-
- Signal_Mask : aliased sigset_t;
- -- The set of signals handled by Notify_Exception
-
- -- 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.
-
- procedure Notify_Exception
- (signo : Signal;
- gs : unsigned_short;
- fs : unsigned_short;
- es : unsigned_short;
- ds : unsigned_short;
- edi : unsigned_long;
- esi : unsigned_long;
- ebp : unsigned_long;
- esp : unsigned_long;
- ebx : unsigned_long;
- edx : unsigned_long;
- ecx : unsigned_long;
- eax : unsigned_long;
- trapno : unsigned_long;
- err : unsigned_long;
- eip : unsigned_long;
- cs : unsigned_short;
- eflags : unsigned_long;
- esp_at_signal : unsigned_long;
- ss : unsigned_short;
- fpstate : System.Address;
- oldmask : unsigned_long;
- cr2 : unsigned_long);
-
- procedure Notify_Exception
- (signo : Signal;
- gs : unsigned_short;
- fs : unsigned_short;
- es : unsigned_short;
- ds : unsigned_short;
- edi : unsigned_long;
- esi : unsigned_long;
- ebp : unsigned_long;
- esp : unsigned_long;
- ebx : unsigned_long;
- edx : unsigned_long;
- ecx : unsigned_long;
- eax : unsigned_long;
- trapno : unsigned_long;
- err : unsigned_long;
- eip : unsigned_long;
- cs : unsigned_short;
- eflags : unsigned_long;
- esp_at_signal : unsigned_long;
- ss : unsigned_short;
- fpstate : System.Address;
- oldmask : unsigned_long;
- cr2 : unsigned_long)
- is
-
- function To_Machine_State_Ptr is new
- Unchecked_Conversion (Address, Machine_State_Ptr);
-
- -- These are not directly visible
-
- procedure Raise_From_Signal_Handler
- (E : Ada.Exceptions.Exception_Id;
- M : System.Address);
- pragma Import
- (Ada, Raise_From_Signal_Handler,
- "ada__exceptions__raise_from_signal_handler");
- pragma No_Return (Raise_From_Signal_Handler);
-
- mstate : Machine_State_Ptr;
- message : aliased constant String := "" & ASCII.Nul;
- -- a null terminated String.
-
- Result : int;
-
- begin
-
- -- Raise_From_Signal_Handler makes sure that the exception is raised
- -- safely from this signal handler.
-
- -- ??? The original signal mask (the one we had before coming into this
- -- signal catching function) should be restored by
- -- Raise_From_Signal_Handler. For now, 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.
-
- mstate := To_Machine_State_Ptr (TSL.Get_Machine_State_Addr.all);
- mstate.eip := eip;
- mstate.ebx := ebx;
- mstate.esp := esp_at_signal;
- mstate.ebp := ebp;
- mstate.esi := esi;
- mstate.edi := edi;
-
- case signo is
- when SIGFPE =>
- Raise_From_Signal_Handler
- (Constraint_Error'Identity, message'Address);
- when SIGILL =>
- Raise_From_Signal_Handler
- (Constraint_Error'Identity, message'Address);
- when SIGSEGV =>
- Raise_From_Signal_Handler
- (Storage_Error'Identity, message'Address);
- when others =>
- if Shutdown ("Unexpected signal") then
- null;
- end if;
- end case;
- end Notify_Exception;
-
- ---------------------------
- -- Initialize_Interrupts --
- ---------------------------
-
- -- Nothing needs to be done on this platform.
-
- procedure Initialize_Interrupts is
- begin
- null;
- end Initialize_Interrupts;
-
-begin
- declare
- act : aliased struct_sigaction;
- old_act : aliased struct_sigaction;
- Result : 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 J in Exception_Interrupts'Range loop
- Result :=
- sigaddset (Signal_Mask'Access, Signal (Exception_Interrupts (J)));
- pragma Assert (Result = 0);
- end loop;
-
- act.sa_mask := Signal_Mask;
-
- Result :=
- sigaction
- (Signal (SIGFPE), act'Unchecked_Access,
- old_act'Unchecked_Access);
- pragma Assert (Result = 0);
-
- 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;
-
- Keep_Unmasked (Abort_Task_Interrupt) := True;
- Keep_Unmasked (SIGXCPU) := True;
- Keep_Unmasked (SIGBUS) := True;
- Keep_Unmasked (SIGFPE) := True;
-
- -- By keeping SIGINT unmasked, allow the user to do a Ctrl-C, but in the
- -- same time, disable the ability of handling this signal
- -- via 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 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;
-
- Reserve (0) := True;
- -- 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.
-
- end;
-end System.Interrupt_Management;
projects / msp430-gcc.git / blobdiff