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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [ada/] [s-mastop-tru64.adb] - Blame information for rev 706

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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT COMPILER COMPONENTS                         --
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--                                                                          --
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--                     SYSTEM.MACHINE_STATE_OPERATIONS                      --
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--                                                                          --
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--                                 B o d y                                  --
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--                         (Version for Alpha/Dec Unix)                     --
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--                                                                          --
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--                     Copyright (C) 1999-2010, AdaCore                     --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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--  This version of System.Machine_State_Operations is for use on
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--  Alpha systems running DEC Unix.
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with System.Memory;
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package body System.Machine_State_Operations is
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   pragma Linker_Options ("-lexc");
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   --  Needed for definitions of exc_capture_context and exc_virtual_unwind
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   ----------------------------
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   -- Allocate_Machine_State --
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   ----------------------------
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   function Allocate_Machine_State return Machine_State is
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      use System.Storage_Elements;
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      function c_machine_state_length return Storage_Offset;
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      pragma Import (C, c_machine_state_length, "__gnat_machine_state_length");
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   begin
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      return Machine_State
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        (Memory.Alloc (Memory.size_t (c_machine_state_length)));
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   end Allocate_Machine_State;
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   ----------------
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   -- Fetch_Code --
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   ----------------
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   function Fetch_Code (Loc : Code_Loc) return Code_Loc is
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   begin
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      return Loc;
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   end Fetch_Code;
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   ------------------------
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   -- Free_Machine_State --
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   ------------------------
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   procedure Free_Machine_State (M : in out Machine_State) is
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   begin
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      Memory.Free (Address (M));
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      M := Machine_State (Null_Address);
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   end Free_Machine_State;
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   ------------------
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   -- Get_Code_Loc --
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   ------------------
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   function Get_Code_Loc (M : Machine_State) return Code_Loc is
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      Asm_Call_Size : constant := 4;
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      function c_get_code_loc (M : Machine_State) return Code_Loc;
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      pragma Import (C, c_get_code_loc, "__gnat_get_code_loc");
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      --  Code_Loc returned by c_get_code_loc is the return point but here we
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      --  want Get_Code_Loc to return the call point. Under DEC Unix a call
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      --  asm instruction takes 4 bytes. So we must remove this value from
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      --  c_get_code_loc to have the call point.
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      Loc : constant Code_Loc := c_get_code_loc (M);
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   begin
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      if Loc = 0 then
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         return 0;
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      else
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         return Loc - Asm_Call_Size;
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      end if;
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   end Get_Code_Loc;
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   --------------------------
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   -- Machine_State_Length --
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   --------------------------
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   function Machine_State_Length
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     return System.Storage_Elements.Storage_Offset
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   is
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      use System.Storage_Elements;
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      function c_machine_state_length return Storage_Offset;
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      pragma Import (C, c_machine_state_length, "__gnat_machine_state_length");
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   begin
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      return c_machine_state_length;
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   end Machine_State_Length;
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   ---------------
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   -- Pop_Frame --
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   ---------------
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   procedure Pop_Frame (M : Machine_State) is
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      procedure exc_virtual_unwind (Fcn : System.Address; M : Machine_State);
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      pragma Import (C, exc_virtual_unwind, "exc_virtual_unwind");
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      function exc_lookup_function (Loc : Code_Loc) return System.Address;
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      pragma Import (C, exc_lookup_function, "exc_lookup_function_entry");
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      procedure c_set_code_loc (M : Machine_State; Loc : Code_Loc);
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      pragma Import (C, c_set_code_loc, "__gnat_set_code_loc");
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      --  Look for a code-range descriptor table containing the PC of the
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      --  specified machine state. If we don't find any, attempting to unwind
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      --  further would fail so we set the machine state's code location to a
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      --  value indicating that the top of the call chain is reached. This
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      --  happens when the function at the address pointed to by PC has not
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      --  been registered with the unwinding machinery, as with the __istart
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      --  functions generated by the linker in presence of initialization
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      --  routines for example.
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      Prf : constant System.Address := exc_lookup_function (Get_Code_Loc (M));
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   begin
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      if Prf = System.Null_Address then
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         c_set_code_loc (M, 0);
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      else
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         exc_virtual_unwind (Prf, M);
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      end if;
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   end Pop_Frame;
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   -----------------------
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   -- Set_Machine_State --
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   -----------------------
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   procedure Set_Machine_State (M : Machine_State) is
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      procedure c_capture_context (M : Machine_State);
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      pragma Import (C, c_capture_context, "exc_capture_context");
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   begin
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      c_capture_context (M);
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      Pop_Frame (M);
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   end Set_Machine_State;
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end System.Machine_State_Operations;

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