diff options
Diffstat (limited to 'gcc/ada/5uintman.adb')
| -rw-r--r-- | gcc/ada/5uintman.adb | 257 |
1 files changed, 0 insertions, 257 deletions
diff --git a/gcc/ada/5uintman.adb b/gcc/ada/5uintman.adb deleted file mode 100644 index 42531492ae7..00000000000 --- a/gcc/ada/5uintman.adb +++ /dev/null @@ -1,257 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- 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 -- --- -- --- Copyright (C) 1991-2002 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; - - Result := - sigaction - (Signal (Exception_Interrupts (J)), - act'Unchecked_Access, - old_act'Unchecked_Access); - pragma Assert (Result = 0); - end loop; - - Keep_Unmasked (Abort_Task_Interrupt) := True; - Keep_Unmasked (SIGALRM) := True; - Keep_Unmasked (SIGSTOP) := True; - Keep_Unmasked (SIGKILL) := 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; |