1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- SYSTEM.MACHINE_STATE_OPERATIONS --
-- --
-- B o d y --
-- (Version for Alpha/Dec Unix) --
-- --
-- $Revision$
-- --
-- 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
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.
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;
|
