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Diffstat (limited to 'gcc-4.2.1/gcc/ada/s-stchop-vxworks.adb')
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1 files changed, 0 insertions, 234 deletions
diff --git a/gcc-4.2.1/gcc/ada/s-stchop-vxworks.adb b/gcc-4.2.1/gcc/ada/s-stchop-vxworks.adb deleted file mode 100644 index 2da1be555..000000000 --- a/gcc-4.2.1/gcc/ada/s-stchop-vxworks.adb +++ /dev/null @@ -1,234 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- --- -- --- S Y S T E M . S T A C K _ C H E C K I N G . O P E R A T I O N S -- --- -- --- B o d y -- --- -- --- Copyright (C) 1999-2005 Free Software Foundation, Inc. -- --- -- --- 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, 51 Franklin Street, Fifth Floor, -- --- Boston, MA 02110-1301, 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. -- --- Extensive contributions were provided by Ada Core Technologies, Inc. -- --- -- ------------------------------------------------------------------------------- - --- This is the VxWorks version of this package. --- This file should be kept synchronized with the general implementation --- provided by s-stchop.adb. - -pragma Restrictions (No_Elaboration_Code); --- We want to guarantee the absence of elaboration code because the --- binder does not handle references to this package. - -with Ada.Exceptions; - -with System.Storage_Elements; use System.Storage_Elements; -with System.Parameters; use System.Parameters; -with System.Soft_Links; -with Interfaces.C; -with System.OS_Interface; - -package body System.Stack_Checking.Operations is - - -- In order to have stack checking working appropriately on - -- VxWorks we need to extract the stack size information from the - -- VxWorks kernel itself. It means that the library for showing - -- task-related information needs to be linked into the VxWorks - -- system, when using stack checking. The TaskShow library can be - -- linked into the VxWorks system by either: - -- * defining INCLUDE_SHOW_ROUTINES in config.h when using - -- configuration header files, or - -- * selecting INCLUDE_TASK_SHOW when using the Tornado project - -- facility. - - function Set_Stack_Info (Stack : access Stack_Access) return Stack_Access; - - -- The function Set_Stack_Info is the actual function that updates - -- the cache containing a pointer to the Stack_Info. It may also - -- be used for detecting asynchronous abort in combination with - -- Invalidate_Self_Cache. - - -- Set_Stack_Info should do the following things in order: - -- 1) Get the Stack_Access value for the current task - -- 2) Set Stack.all to the value obtained in 1) - -- 3) Optionally Poll to check for asynchronous abort - - -- This order is important because if at any time a write to - -- the stack cache is pending, that write should be followed - -- by a Poll to prevent loosing signals. - - -- Note: This function must be compiled with Polling turned off - - -- Note: on systems like VxWorks and OS/2 with real thread-local storage, - -- Set_Stack_Info should return an access value for such local - -- storage. In those cases the cache will always be up-to-date. - - -- The following constants should be imported from some system-specific - -- constants package. The constants must be static for performance reasons. - - ---------------------------- - -- Invalidate_Stack_Cache -- - ---------------------------- - - procedure Invalidate_Stack_Cache (Any_Stack : Stack_Access) is - pragma Warnings (Off, Any_Stack); - begin - Cache := Null_Stack; - end Invalidate_Stack_Cache; - - -------------------- - -- Set_Stack_Info -- - -------------------- - - function Set_Stack_Info - (Stack : access Stack_Access) return Stack_Access - is - - -- Task descriptor that is handled internally by the VxWorks kernel - type Task_Descriptor is record - T_Id : Interfaces.C.int; -- task identifier - Td_Name : System.Address; -- task name - Td_Priority : Interfaces.C.int; -- task priority - Td_Status : Interfaces.C.int; -- task status - Td_Options : Interfaces.C.int; -- task option bits (see below) - Td_Entry : System.Address; -- original entry point of task - Td_Sp : System.Address; -- saved stack pointer - Td_PStackBase : System.Address; -- the bottom of the stack - Td_PStackLimit : System.Address; -- the effective end of the stack - Td_PStackEnd : System.Address; -- the actual end of the stack - Td_StackSize : Interfaces.C.int; -- size of stack in bytes - Td_StackCurrent : Interfaces.C.int; -- current stack usage in bytes - Td_StackHigh : Interfaces.C.int; -- maximum stack usage in bytes - Td_StackMargin : Interfaces.C.int; -- current stack margin in bytes - Td_ErrorStatus : Interfaces.C.int; -- most recent task error status - Td_Delay : Interfaces.C.int; -- delay/timeout ticks - end record; - pragma Convention (C, Task_Descriptor); - - -- This VxWorks procedure fills in a specified task descriptor - -- for a specified task. - procedure TaskInfoGet (T_Id : System.OS_Interface.t_id; - Task_Desc : access Task_Descriptor); - pragma Import (C, TaskInfoGet, "taskInfoGet"); - - My_Stack : Stack_Access; - Task_Desc : aliased Task_Descriptor; - - begin - -- The order of steps 1 .. 3 is important, see specification. - - -- 1) Get the Stack_Access value for the current task - - My_Stack := Soft_Links.Get_Stack_Info.all; - - if My_Stack.Base = Null_Address then - - -- First invocation. Ask the VxWorks kernel about stack - -- values. - TaskInfoGet (System.OS_Interface.taskIdSelf, Task_Desc'Access); - - My_Stack.Size := System.Storage_Elements.Storage_Offset - (Task_Desc.Td_StackSize); - My_Stack.Base := Task_Desc.Td_PStackBase; - My_Stack.Limit := Task_Desc.Td_PStackLimit; - - end if; - - -- 2) Set Stack.all to the value obtained in 1) - - Stack.all := My_Stack; - - -- 3) Optionally Poll to check for asynchronous abort - - if Soft_Links.Check_Abort_Status.all /= 0 then - raise Standard'Abort_Signal; - end if; - - return My_Stack; -- Never trust the cached value, but return local copy! - end Set_Stack_Info; - - ----------------- - -- Stack_Check -- - ----------------- - - function Stack_Check - (Stack_Address : System.Address) return Stack_Access - is - type Frame_Marker is null record; - Marker : Frame_Marker; - Cached_Stack : constant Stack_Access := Cache; - Frame_Address : constant System.Address := Marker'Address; - - begin - -- This function first does a "cheap" check which is correct - -- if it succeeds. In case of failure, the full check is done. - -- Ideally the cheap check should be done in an optimized manner, - -- or be inlined. - - if (Stack_Grows_Down and then - (Frame_Address <= Cached_Stack.Base - and - Stack_Address > Cached_Stack.Limit)) - or else - (not Stack_Grows_Down and then - (Frame_Address >= Cached_Stack.Base - and - Stack_Address < Cached_Stack.Limit)) - then - -- Cached_Stack is valid as it passed the stack check - return Cached_Stack; - end if; - - Full_Check : - declare - My_Stack : constant Stack_Access := Set_Stack_Info (Cache'Access); - -- At this point Stack.all might already be invalid, so - -- it is essential to use our local copy of Stack! - - begin - if (Stack_Grows_Down and then - Stack_Address < My_Stack.Limit) - or else - (not Stack_Grows_Down and then - Stack_Address > My_Stack.Limit) - then - Ada.Exceptions.Raise_Exception - (E => Storage_Error'Identity, - Message => "stack overflow detected"); - end if; - - return My_Stack; - end Full_Check; - end Stack_Check; - - ------------------------ - -- Update_Stack_Cache -- - ------------------------ - - procedure Update_Stack_Cache (Stack : Stack_Access) is - begin - if not Multi_Processor then - Cache := Stack; - end if; - end Update_Stack_Cache; - -end System.Stack_Checking.Operations; |