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
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
/*
* tkWin32Dll.c --
*
* This file contains a stub dll entry point.
*
* Copyright (c) 1995 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tkWin32Dll.c,v 1.10 2004/10/28 19:51:37 mdejong Exp $
*/
#include "tkWinInt.h"
#ifndef STATIC_BUILD
#if defined(HAVE_NO_SEH) && defined(TCL_MEM_DEBUG)
static void *INITIAL_ESP,
*INITIAL_EBP,
*INITIAL_HANDLER,
*RESTORED_ESP,
*RESTORED_EBP,
*RESTORED_HANDLER;
#endif /* HAVE_NO_SEH && TCL_MEM_DEBUG */
#ifdef HAVE_NO_SEH
static
__attribute__ ((cdecl))
EXCEPTION_DISPOSITION
_except_dllmain_detach_handler(
struct _EXCEPTION_RECORD *ExceptionRecord,
void *EstablisherFrame,
struct _CONTEXT *ContextRecord,
void *DispatcherContext);
#endif /* HAVE_NO_SEH */
#ifdef HAVE_NO_SEH
/* Need to add noinline flag to DllMain declaration so that gcc -O3
* does not inline asm code into DllEntryPoint and cause a
* compile time error because of redefined local labels.
*/
BOOL APIENTRY DllMain(HINSTANCE hInst, DWORD reason,
LPVOID reserved)
__attribute__ ((noinline));
#else
/*
* The following declaration is for the VC++ DLL entry point.
*/
BOOL APIENTRY DllMain _ANSI_ARGS_((HINSTANCE hInst,
DWORD reason, LPVOID reserved));
#endif /* HAVE_NO_SEH */
/*
*----------------------------------------------------------------------
*
* DllEntryPoint --
*
* This wrapper function is used by Borland to invoke the
* initialization code for Tk. It simply calls the DllMain
* routine.
*
* Results:
* See DllMain.
*
* Side effects:
* See DllMain.
*
*----------------------------------------------------------------------
*/
BOOL APIENTRY
DllEntryPoint(hInst, reason, reserved)
HINSTANCE hInst; /* Library instance handle. */
DWORD reason; /* Reason this function is being called. */
LPVOID reserved; /* Not used. */
{
return DllMain(hInst, reason, reserved);
}
/*
*----------------------------------------------------------------------
*
* DllMain --
*
* DLL entry point. It is only necessary to specify our dll here so
* that resources are found correctly. Otherwise Tk will initialize
* and clean up after itself through other methods, in order to be
* consistent whether the build is static or dynamic.
*
* Results:
* Always TRUE.
*
* Side effects:
* This might call some sycronization functions, but MSDN
* documentation states: "Waiting on synchronization objects in
* DllMain can cause a deadlock."
*
*----------------------------------------------------------------------
*/
BOOL APIENTRY
DllMain(hInstance, reason, reserved)
HINSTANCE hInstance;
DWORD reason;
LPVOID reserved;
{
/*
* If we are attaching to the DLL from a new process, tell Tk about
* the hInstance to use.
*/
switch (reason) {
case DLL_PROCESS_ATTACH:
DisableThreadLibraryCalls(hInstance);
TkWinSetHINSTANCE(hInstance);
break;
case DLL_PROCESS_DETACH:
/*
* Protect the call to TkFinalize in an SEH block. We can't
* be guarenteed Tk is always being unloaded from a stable
* condition.
*/
#ifdef HAVE_NO_SEH
# ifdef TCL_MEM_DEBUG
__asm__ __volatile__ (
"movl %%esp, %0" "\n\t"
"movl %%ebp, %1" "\n\t"
"movl %%fs:0, %2" "\n\t"
: "=m"(INITIAL_ESP),
"=m"(INITIAL_EBP),
"=r"(INITIAL_HANDLER) );
# endif /* TCL_MEM_DEBUG */
__asm__ __volatile__ (
"pushl %%ebp" "\n\t"
"pushl %0" "\n\t"
"pushl %%fs:0" "\n\t"
"movl %%esp, %%fs:0"
:
: "r" (_except_dllmain_detach_handler) );
#else
__try {
#endif /* HAVE_NO_SEH */
/*
* Run and remove our exit handlers, if they haven't already
* been run. Just in case we are being unloaded prior to
* Tcl (it can happen), we won't leave any dangling pointers
* hanging around for when Tcl gets unloaded later.
*/
TkFinalize(NULL);
#ifdef HAVE_NO_SEH
__asm__ __volatile__ (
"jmp dllmain_detach_pop" "\n"
"dllmain_detach_reentry:" "\n\t"
"movl %%fs:0, %%eax" "\n\t"
"movl 0x8(%%eax), %%esp" "\n\t"
"movl 0x8(%%esp), %%ebp" "\n"
"dllmain_detach_pop:" "\n\t"
"movl (%%esp), %%eax" "\n\t"
"movl %%eax, %%fs:0" "\n\t"
"add $12, %%esp" "\n\t"
:
:
: "%eax");
# ifdef TCL_MEM_DEBUG
__asm__ __volatile__ (
"movl %%esp, %0" "\n\t"
"movl %%ebp, %1" "\n\t"
"movl %%fs:0, %2" "\n\t"
: "=m"(RESTORED_ESP),
"=m"(RESTORED_EBP),
"=r"(RESTORED_HANDLER) );
if (INITIAL_ESP != RESTORED_ESP)
Tcl_Panic("ESP restored incorrectly");
if (INITIAL_EBP != RESTORED_EBP)
Tcl_Panic("EBP restored incorrectly");
if (INITIAL_HANDLER != RESTORED_HANDLER)
Tcl_Panic("HANDLER restored incorrectly");
# endif /* TCL_MEM_DEBUG */
#else
} __except (EXCEPTION_EXECUTE_HANDLER) {
/* empty handler body */
}
#endif /* HAVE_NO_SEH */
break;
}
return TRUE;
}
/*
*----------------------------------------------------------------------
*
* _except_dllmain_detach_handler --
*
* SEH exception handler for DllMain.
*
* Results:
* See DllMain.
*
* Side effects:
* See DllMain.
*
*----------------------------------------------------------------------
*/
#ifdef HAVE_NO_SEH
static
__attribute__ ((cdecl))
EXCEPTION_DISPOSITION
_except_dllmain_detach_handler(
struct _EXCEPTION_RECORD *ExceptionRecord,
void *EstablisherFrame,
struct _CONTEXT *ContextRecord,
void *DispatcherContext)
{
__asm__ __volatile__ (
"jmp dllmain_detach_reentry");
return 0; /* Function does not return */
}
#endif /* HAVE_NO_SEH */
#endif /* !STATIC_BUILD */
|
