X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Fada%2Fs-stchop-vxworks.adb;h=9552d570fc0b6f4634f8422e497a806e2a09ba55;hb=f16404e36172337a1a48d0c4d16ae0090056d057;hp=b19bb56f27499d6f26e2ffa22c689e7d1866dc4b;hpb=3e55413dd9a577b7b270e04f09ccb3f13a90a3cb;p=pf3gnuchains%2Fgcc-fork.git diff --git a/gcc/ada/s-stchop-vxworks.adb b/gcc/ada/s-stchop-vxworks.adb index b19bb56f274..9552d570fc0 100644 --- a/gcc/ada/s-stchop-vxworks.adb +++ b/gcc/ada/s-stchop-vxworks.adb @@ -1,30 +1,28 @@ ------------------------------------------------------------------------------ -- -- --- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS -- +-- 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) 1999-2004 Free Software Foundation, Inc. -- +-- Copyright (C) 1999-2009, 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- -- +-- ware Foundation; either version 3, or (at your option) any later ver- -- +-- sion. GNAT 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. -- +-- or FITNESS FOR A PARTICULAR PURPOSE. -- -- -- --- 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. -- +-- As a special exception under Section 7 of GPL version 3, you are granted -- +-- additional permissions described in the GCC Runtime Library Exception, -- +-- version 3.1, as published by the Free Software Foundation. -- +-- -- +-- You should have received a copy of the GNU General Public License and -- +-- a copy of the GCC Runtime Library Exception along with this program; -- +-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- +-- . -- -- -- -- GNARL was developed by the GNARL team at Florida State University. -- -- Extensive contributions were provided by Ada Core Technologies, Inc. -- @@ -39,217 +37,109 @@ 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: + -- 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; - - -- 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; - + Stack_Limit : Address := + Boolean'Pos (Stack_Grows_Down) * Address'First + + Boolean'Pos (not Stack_Grows_Down) * Address'Last; + pragma Export (C, Stack_Limit, "__gnat_stack_limit"); + -- Stack_Limit contains the limit of the stack. This variable is later made + -- a task variable (by calling taskVarAdd) and then correctly set to the + -- stack limit of the task. Before being so initialized its value must be + -- valid so that any subprogram with stack checking enabled will run. We + -- use extreme values according to the direction of the stack. + + type Set_Stack_Limit_Proc_Acc is access procedure; + pragma Convention (C, Set_Stack_Limit_Proc_Acc); + + Set_Stack_Limit_Hook : Set_Stack_Limit_Proc_Acc; + pragma Import (C, Set_Stack_Limit_Hook, "__gnat_set_stack_limit_hook"); + -- Procedure to be called when a task is created to set stack + -- limit. + + procedure Set_Stack_Limit_For_Current_Task; + pragma Convention (C, Set_Stack_Limit_For_Current_Task); + -- Register Initial_SP as the initial stack pointer value for the current + -- task when it starts and Size as the associated stack area size. This + -- should be called once, after the soft-links have been initialized? + + ----------------------------- + -- Initialize_Stack_Limit -- + ----------------------------- + + procedure Initialize_Stack_Limit is 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; + -- For the environment task - if My_Stack.Base = Null_Address then + Set_Stack_Limit_For_Current_Task; - -- First invocation. Ask the VxWorks kernel about stack - -- values. - TaskInfoGet (System.OS_Interface.taskIdSelf, Task_Desc'Access); + -- Will be called by every created task - 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; + Set_Stack_Limit_Hook := Set_Stack_Limit_For_Current_Task'Access; + end Initialize_Stack_Limit; - end if; - - -- 2) Set Stack.all to the value obtained in 1) + -------------------------------------- + -- Set_Stack_Limit_For_Current_Task -- + -------------------------------------- - Stack.all := My_Stack; + procedure Set_Stack_Limit_For_Current_Task is + use Interfaces.C; - -- 3) Optionally Poll to check for asynchronous abort - - if Soft_Links.Check_Abort_Status.all /= 0 then - raise Standard'Abort_Signal; - end if; + function Task_Var_Add (Tid : Interfaces.C.int; Var : Address) + return Interfaces.C.int; + pragma Import (C, Task_Var_Add, "taskVarAdd"); + -- Import from VxWorks - return My_Stack; -- Never trust the cached value, but return local copy! - end Set_Stack_Info; + type OS_Stack_Info is record + Size : Interfaces.C.int; + Base : System.Address; + Limit : System.Address; + end record; + pragma Convention (C, OS_Stack_Info); + -- Type representing the information that we want to extract from the + -- underlying kernel. - -------------------- - -- Set_Stack_Size -- - -------------------- + procedure Get_Stack_Info (Stack : not null access OS_Stack_Info); + pragma Import (C, Get_Stack_Info, "__gnat_get_stack_info"); + -- Procedure that fills the stack information associated to the + -- currently executing task. - -- Specify the stack size for the current frame. + Stack_Info : aliased OS_Stack_Info; - procedure Set_Stack_Size - (Stack_Size : System.Storage_Elements.Storage_Offset) - is - My_Stack : Stack_Access; - Frame_Address : constant System.Address := My_Stack'Address; + Limit : System.Address; begin - My_Stack := Stack_Check (Frame_Address); + -- Get stack bounds from VxWorks + + Get_Stack_Info (Stack_Info'Access); if Stack_Grows_Down then - My_Stack.Limit := My_Stack.Base - Stack_Size; + Limit := Stack_Info.Base - Storage_Offset (Stack_Info.Size); else - My_Stack.Limit := My_Stack.Base + Stack_Size; + Limit := Stack_Info.Base + Storage_Offset (Stack_Info.Size); end if; - end Set_Stack_Size; - ----------------- - -- Stack_Check -- - ----------------- + -- Note: taskVarAdd implicitly calls taskVarInit if required - 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; + if Task_Var_Add (0, Stack_Limit'Address) = 0 then + Stack_Limit := Limit; end if; - end Update_Stack_Cache; + end Set_Stack_Limit_For_Current_Task; end System.Stack_Checking.Operations;