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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- SYSTEM.MACHINE_STATE_OPERATIONS --
+-- --
+-- B o d y --
+-- (Version for Alpha/Dec Unix) --
+-- --
+-- Copyright (C) 1999-2005, AdaCore --
+-- --
+-- 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, 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. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- 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
+
+ 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;
+
+ ----------------
+ -- 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
+ begin
+ Memory.Free (Address (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.
+
+ Loc : constant Code_Loc := c_get_code_loc (M);
+
+ begin
+ if Loc = 0 then
+ return 0;
+ else
+ return Loc - Asm_Call_Size;
+ end if;
+ 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) is
+ procedure exc_virtual_unwind (Fcn : System.Address; M : Machine_State);
+ pragma Import (C, exc_virtual_unwind, "exc_virtual_unwind");
+
+ function exc_lookup_function (Loc : Code_Loc) return System.Address;
+ pragma Import (C, exc_lookup_function, "exc_lookup_function_entry");
+
+ procedure c_set_code_loc (M : Machine_State; Loc : Code_Loc);
+ pragma Import (C, c_set_code_loc, "__gnat_set_code_loc");
+
+ -- Look for a code-range descriptor table containing the PC of the
+ -- specified machine state. If we don't find any, attempting to unwind
+ -- further would fail so we set the machine state's code location to a
+ -- value indicating that the top of the call chain is reached. This
+ -- happens when the function at the address pointed to by PC has not
+ -- been registered with the unwinding machinery, as with the __istart
+ -- functions generated by the linker in presence of initialization
+ -- routines for example.
+
+ Prf : constant System.Address := exc_lookup_function (Get_Code_Loc (M));
+
+ begin
+ if Prf = System.Null_Address then
+ c_set_code_loc (M, 0);
+ else
+ exc_virtual_unwind (Prf, M);
+ end if;
+ 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);
+ end Set_Machine_State;
+
+end System.Machine_State_Operations;