1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- SYSTEM.MACHINE_STATE_OPERATIONS --
8 -- (Version for Alpha/Dec Unix) --
10 -- Copyright (C) 1999-2003 Ada Core Technologies, Inc. --
12 -- GNAT is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNAT; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
23 -- As a special exception, if other files instantiate generics from this --
24 -- unit, or you link this unit with other files to produce an executable, --
25 -- this unit does not by itself cause the resulting executable to be --
26 -- covered by the GNU General Public License. This exception does not --
27 -- however invalidate any other reasons why the executable file might be --
28 -- covered by the GNU Public License. --
30 -- GNAT was originally developed by the GNAT team at New York University. --
31 -- Extensive contributions were provided by Ada Core Technologies Inc. --
33 ------------------------------------------------------------------------------
35 -- This version of System.Machine_State_Operations is for use on
36 -- Alpha systems running DEC Unix.
40 package body System.Machine_State_Operations is
42 use System.Exceptions;
44 pragma Linker_Options ("-lexc");
45 -- Needed for definitions of exc_capture_context and exc_virtual_unwind
47 ----------------------------
48 -- Allocate_Machine_State --
49 ----------------------------
51 function Allocate_Machine_State return Machine_State is
52 use System.Storage_Elements;
54 function c_machine_state_length return Storage_Offset;
55 pragma Import (C, c_machine_state_length, "__gnat_machine_state_length");
59 (Memory.Alloc (Memory.size_t (c_machine_state_length)));
60 end Allocate_Machine_State;
66 procedure Enter_Handler (M : Machine_State; Handler : Handler_Loc) is
67 procedure c_enter_handler (M : Machine_State; Handler : Handler_Loc);
68 pragma Import (C, c_enter_handler, "__gnat_enter_handler");
71 c_enter_handler (M, Handler);
78 function Fetch_Code (Loc : Code_Loc) return Code_Loc is
83 ------------------------
84 -- Free_Machine_State --
85 ------------------------
87 procedure Free_Machine_State (M : in out Machine_State) is
89 Memory.Free (Address (M));
90 M := Machine_State (Null_Address);
91 end Free_Machine_State;
97 function Get_Code_Loc (M : Machine_State) return Code_Loc is
98 Asm_Call_Size : constant := 4;
100 function c_get_code_loc (M : Machine_State) return Code_Loc;
101 pragma Import (C, c_get_code_loc, "__gnat_get_code_loc");
103 -- Code_Loc returned by c_get_code_loc is the return point but here we
104 -- want Get_Code_Loc to return the call point. Under DEC Unix a call
105 -- asm instruction takes 4 bytes. So we must remove this value from
106 -- c_get_code_loc to have the call point.
108 Loc : constant Code_Loc := c_get_code_loc (M);
114 return Loc - Asm_Call_Size;
118 --------------------------
119 -- Machine_State_Length --
120 --------------------------
122 function Machine_State_Length
123 return System.Storage_Elements.Storage_Offset
125 use System.Storage_Elements;
127 function c_machine_state_length return Storage_Offset;
128 pragma Import (C, c_machine_state_length, "__gnat_machine_state_length");
131 return c_machine_state_length;
132 end Machine_State_Length;
140 Info : Subprogram_Info_Type)
142 pragma Warnings (Off, Info);
144 procedure exc_virtual_unwind
145 (Fcn : System.Address;
147 pragma Import (C, exc_virtual_unwind, "exc_virtual_unwind");
150 exc_virtual_unwind (System.Null_Address, M);
153 -----------------------
154 -- Set_Machine_State --
155 -----------------------
157 procedure Set_Machine_State (M : Machine_State) is
158 procedure c_capture_context (M : Machine_State);
159 pragma Import (C, c_capture_context, "exc_capture_context");
162 c_capture_context (M);
163 Pop_Frame (M, System.Null_Address);
164 end Set_Machine_State;
166 ------------------------------
167 -- Set_Signal_Machine_State --
168 ------------------------------
170 procedure Set_Signal_Machine_State
172 Context : System.Address)
174 pragma Warnings (Off, M);
175 pragma Warnings (Off, Context);
179 end Set_Signal_Machine_State;
181 end System.Machine_State_Operations;