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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- SYSTEM.MACHINE_STATE_OPERATIONS --
-- --
-- B o d y --
-- (Version for Alpha/Dec Unix) --
-- --
-- $Revision: 1.5 $
-- --
-- Copyright (C) 1999-2001 Ada Core Technologies, Inc. --
-- --
-- GNAT 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. 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 GNAT; 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. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
-- --
------------------------------------------------------------------------------
-- This version of System.Machine_State_Operations is for use on
-- Alpha systems running DEC Unix.
with System.Memory;
package body System.Machine_State_Operations is
use System.Exceptions;
pragma Linker_Options ("-lexc");
-- Needed for definitions of exc_capture_context and exc_virtual_unwind
----------------------------
-- Allocate_Machine_State --
----------------------------
function Allocate_Machine_State return Machine_State is
use System.Storage_Elements;
function c_machine_state_length return Storage_Offset;
pragma Import (C, c_machine_state_length, "__gnat_machine_state_length");
begin
return Machine_State
(Memory.Alloc (Memory.size_t (c_machine_state_length)));
end Allocate_Machine_State;
-------------------
-- Enter_Handler --
-------------------
procedure Enter_Handler (M : Machine_State; Handler : Handler_Loc) is
procedure c_enter_handler (M : Machine_State; Handler : Handler_Loc);
pragma Import (C, c_enter_handler, "__gnat_enter_handler");
begin
c_enter_handler (M, Handler);
end Enter_Handler;
----------------
-- Fetch_Code --
----------------
function Fetch_Code (Loc : Code_Loc) return Code_Loc is
begin
return Loc;
end Fetch_Code;
------------------------
-- Free_Machine_State --
------------------------
procedure Free_Machine_State (M : in out Machine_State) is
procedure Gnat_Free (M : in Machine_State);
pragma Import (C, Gnat_Free, "__gnat_free");
begin
Gnat_Free (M);
M := Machine_State (Null_Address);
end Free_Machine_State;
------------------
-- Get_Code_Loc --
------------------
function Get_Code_Loc (M : Machine_State) return Code_Loc is
Asm_Call_Size : constant := 4;
function c_get_code_loc (M : Machine_State) return Code_Loc;
pragma Import (C, c_get_code_loc, "__gnat_get_code_loc");
-- Code_Loc returned by c_get_code_loc is the return point but here we
-- want Get_Code_Loc to return the call point. Under DEC Unix a call
-- asm instruction takes 4 bytes. So we must remove this value from
-- c_get_code_loc to have the call point.
begin
return c_get_code_loc (M) - Asm_Call_Size;
end Get_Code_Loc;
--------------------------
-- Machine_State_Length --
--------------------------
function Machine_State_Length
return System.Storage_Elements.Storage_Offset
is
use System.Storage_Elements;
function c_machine_state_length return Storage_Offset;
pragma Import (C, c_machine_state_length, "__gnat_machine_state_length");
begin
return c_machine_state_length;
end Machine_State_Length;
---------------
-- Pop_Frame --
---------------
procedure Pop_Frame
(M : Machine_State;
Info : Subprogram_Info_Type)
is
procedure exc_virtual_unwind
(Fcn : System.Address;
M : Machine_State);
pragma Import (C, exc_virtual_unwind, "exc_virtual_unwind");
begin
exc_virtual_unwind (System.Null_Address, M);
end Pop_Frame;
-----------------------
-- Set_Machine_State --
-----------------------
procedure Set_Machine_State (M : Machine_State) is
procedure c_capture_context (M : Machine_State);
pragma Import (C, c_capture_context, "exc_capture_context");
begin
c_capture_context (M);
Pop_Frame (M, System.Null_Address);
end Set_Machine_State;
------------------------------
-- Set_Signal_Machine_State --
------------------------------
procedure Set_Signal_Machine_State
(M : Machine_State;
Context : System.Address) is
begin
null;
end Set_Signal_Machine_State;
end System.Machine_State_Operations;
|
