2 * 386-specific Win32 dll<->dll snooping functions
4 * Copyright 1998 Marcus Meissner
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include "wine/port.h"
30 #include "stackframe.h"
31 #include "wine/debug.h"
32 #include "wine/exception.h"
33 #include "msvcrt/excpt.h"
35 WINE_DEFAULT_DEBUG_CHANNEL(snoop
);
37 static WINE_EXCEPTION_FILTER(page_fault
)
39 if (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION
||
40 GetExceptionCode() == EXCEPTION_PRIV_INSTRUCTION
)
41 return EXCEPTION_EXECUTE_HANDLER
;
42 return EXCEPTION_CONTINUE_SEARCH
;
45 extern const char **debug_snoop_excludelist
;
46 extern const char **debug_snoop_includelist
;
50 extern void WINAPI
SNOOP_Entry();
51 extern void WINAPI
SNOOP_Return();
55 typedef struct tagSNOOP_FUN
{
57 BYTE lcall
; /* 0xe8 call snoopentry (relative) */
58 /* NOTE: If you move snoopentry OR nrofargs fix the relative offset
61 DWORD snoopentry
; /* SNOOP_Entry relative */
68 typedef struct tagSNOOP_DLL
{
73 struct tagSNOOP_DLL
*next
;
77 typedef struct tagSNOOP_RETURNENTRY
{
79 BYTE lcall
; /* 0xe8 call snoopret relative*/
80 /* NOTE: If you move snoopret OR origreturn fix the relative offset
83 DWORD snoopret
; /* SNOOP_Ret relative */
89 DWORD
*args
; /* saved args across a stdcall */
92 typedef struct tagSNOOP_RETURNENTRIES
{
93 SNOOP_RETURNENTRY entry
[4092/sizeof(SNOOP_RETURNENTRY
)];
94 struct tagSNOOP_RETURNENTRIES
*next
;
95 } SNOOP_RETURNENTRIES
;
99 static SNOOP_DLL
*firstdll
= NULL
;
100 static SNOOP_RETURNENTRIES
*firstrets
= NULL
;
102 /***********************************************************************
103 * SNOOP_ShowDebugmsgSnoop
105 * Simple function to decide if a particular debugging message is
108 int SNOOP_ShowDebugmsgSnoop(const char *dll
, int ord
, const char *fname
) {
110 if(debug_snoop_excludelist
|| debug_snoop_includelist
) {
111 const char **listitem
;
113 int len
, len2
, itemlen
, show
;
115 if(debug_snoop_excludelist
) {
117 listitem
= debug_snoop_excludelist
;
120 listitem
= debug_snoop_includelist
;
124 sprintf(buf
, "%s.%d", dll
, ord
);
126 for(; *listitem
; listitem
++) {
127 itemlen
= strlen(*listitem
);
128 if((itemlen
== len
&& !strncasecmp(*listitem
, buf
, len
)) ||
129 (itemlen
== len2
&& !strncasecmp(*listitem
, buf
, len2
)) ||
130 !strcasecmp(*listitem
, fname
)) {
141 SNOOP_RegisterDLL(HMODULE hmod
,LPCSTR name
,DWORD ordbase
,DWORD nrofordinals
) {
142 SNOOP_DLL
**dll
= &(firstdll
);
145 TRACE("hmod=%x, name=%s, ordbase=%ld, nrofordinals=%ld\n",
146 hmod
, name
, ordbase
, nrofordinals
);
148 if (!TRACE_ON(snoop
)) return;
150 if ((*dll
)->hmod
== hmod
)
152 /* another dll, loaded at the same address */
153 VirtualFree((*dll
)->funs
, (*dll
)->nrofordinals
*sizeof(SNOOP_FUN
), MEM_RELEASE
);
156 dll
= &((*dll
)->next
);
158 *dll
= HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY
, *dll
, sizeof(SNOOP_DLL
)+strlen(name
));
160 (*dll
)->ordbase
= ordbase
;
161 (*dll
)->nrofordinals
= nrofordinals
;
162 strcpy( (*dll
)->name
, name
);
163 if ((s
=strrchr((*dll
)->name
,'.')))
165 (*dll
)->funs
= VirtualAlloc(NULL
,nrofordinals
*sizeof(SNOOP_FUN
),MEM_COMMIT
|MEM_RESERVE
,PAGE_EXECUTE_READWRITE
);
166 memset((*dll
)->funs
,0,nrofordinals
*sizeof(SNOOP_FUN
));
168 HeapFree(GetProcessHeap(),0,*dll
);
169 FIXME("out of memory\n");
175 SNOOP_GetProcAddress(HMODULE hmod
,LPCSTR name
,DWORD ordinal
,FARPROC origfun
) {
176 SNOOP_DLL
*dll
= firstdll
;
179 IMAGE_SECTION_HEADER
*pe_seg
= PE_SECTIONS(hmod
);
181 if (!TRACE_ON(snoop
)) return origfun
;
182 if (!*(LPBYTE
)origfun
) /* 0x00 is an imposs. opcode, poss. dataref. */
184 for (j
=0;j
<PE_HEADER(hmod
)->FileHeader
.NumberOfSections
;j
++)
185 /* 0x42 is special ELF loader tag */
186 if ((pe_seg
[j
].VirtualAddress
==0x42) ||
187 (((char *)origfun
- (char *)hmod
>=pe_seg
[j
].VirtualAddress
)&&
188 ((char *)origfun
- (char *)hmod
<pe_seg
[j
].VirtualAddress
+
189 pe_seg
[j
].SizeOfRawData
193 /* If we looked through all sections (and didn't find one)
194 * or if the sectionname contains "data", we return the
195 * original function since it is most likely a datareference.
197 if ( (j
==PE_HEADER(hmod
)->FileHeader
.NumberOfSections
) ||
198 (strstr(pe_seg
[j
].Name
,"data")) ||
199 !(pe_seg
[j
].Characteristics
& IMAGE_SCN_CNT_CODE
)
204 if (hmod
== dll
->hmod
)
208 if (!dll
) /* probably internal */
210 if (!SNOOP_ShowDebugmsgSnoop(dll
->name
,ordinal
,name
))
212 assert(ordinal
< dll
->nrofordinals
);
213 fun
= dll
->funs
+ordinal
;
216 fun
->name
= HeapAlloc(GetProcessHeap(),0,strlen(name
)+1);
217 strcpy( fun
->name
, name
);
219 /* NOTE: origreturn struct member MUST come directly after snoopentry */
220 fun
->snoopentry
= (char*)SNOOP_Entry
-((char*)(&fun
->nrofargs
));
221 fun
->origfun
= origfun
;
224 return (FARPROC
)&(fun
->lcall
);
227 static void SNOOP_PrintArg(DWORD x
)
232 if ( !HIWORD(x
) ) return; /* trivial reject to avoid faults */
239 if (s
[i
]<0x20) {nostring
=1;break;}
240 if (s
[i
]>=0x80) {nostring
=1;break;}
243 if (!nostring
&& i
> 5)
244 DPRINTF(" %s",debugstr_an((LPSTR
)x
,i
));
245 else /* try unicode */
251 if (s
[i
]<0x20) {nostring
=1;break;}
252 if (s
[i
]>0x100) {nostring
=1;break;}
255 if (!nostring
&& i
> 5) DPRINTF(" %s",debugstr_wn((LPWSTR
)x
,i
));
264 #define CALLER1REF (*(DWORD*)context->Esp)
266 void WINAPI
SNOOP_DoEntry( CONTEXT86
*context
)
268 DWORD ordinal
=0,entry
= context
->Eip
- 5;
269 SNOOP_DLL
*dll
= firstdll
;
270 SNOOP_FUN
*fun
= NULL
;
271 SNOOP_RETURNENTRIES
**rets
= &firstrets
;
272 SNOOP_RETURNENTRY
*ret
;
276 if ( ((char*)entry
>=(char*)dll
->funs
) &&
277 ((char*)entry
<=(char*)(dll
->funs
+dll
->nrofordinals
))
279 fun
= (SNOOP_FUN
*)entry
;
280 ordinal
= fun
-dll
->funs
;
286 FIXME("entrypoint 0x%08lx not found\n",entry
);
289 /* guess cdecl ... */
290 if (fun
->nrofargs
<0) {
291 /* Typical cdecl return frame is:
293 * which has (for xxxxxxxx up to 255 the opcode "83 C4 xx".
294 * (after that 81 C2 xx xx xx xx)
296 LPBYTE reteip
= (LPBYTE
)CALLER1REF
;
299 if ((reteip
[0]==0x83)&&(reteip
[1]==0xc4))
300 fun
->nrofargs
=reteip
[2]/4;
306 for (i
=0;i
<sizeof((*rets
)->entry
)/sizeof((*rets
)->entry
[0]);i
++)
307 if (!(*rets
)->entry
[i
].origreturn
)
309 if (i
!=sizeof((*rets
)->entry
)/sizeof((*rets
)->entry
[0]))
311 rets
= &((*rets
)->next
);
314 *rets
= VirtualAlloc(NULL
,4096,MEM_COMMIT
|MEM_RESERVE
,PAGE_EXECUTE_READWRITE
);
315 memset(*rets
,0,4096);
316 i
= 0; /* entry 0 is free */
318 ret
= &((*rets
)->entry
[i
]);
320 /* NOTE: origreturn struct member MUST come directly after snoopret */
321 ret
->snoopret
= ((char*)SNOOP_Return
)-(char*)(&ret
->origreturn
);
322 ret
->origreturn
= (FARPROC
)CALLER1REF
;
323 CALLER1REF
= (DWORD
)&ret
->lcall
;
326 ret
->ordinal
= ordinal
;
327 ret
->origESP
= context
->Esp
;
329 context
->Eip
= (DWORD
)fun
->origfun
;
331 DPRINTF("%08lx:CALL %s.%ld: %s(",GetCurrentThreadId(),dll
->name
,dll
->ordbase
+ordinal
,fun
->name
);
332 if (fun
->nrofargs
>0) {
333 max
= fun
->nrofargs
; if (max
>16) max
=16;
336 SNOOP_PrintArg(*(DWORD
*)(context
->Esp
+ 4 + sizeof(DWORD
)*i
));
337 if (i
<fun
->nrofargs
-1) DPRINTF(",");
339 if (max
!=fun
->nrofargs
)
341 } else if (fun
->nrofargs
<0) {
342 DPRINTF("<unknown, check return>");
343 ret
->args
= HeapAlloc(GetProcessHeap(),0,16*sizeof(DWORD
));
344 memcpy(ret
->args
,(LPBYTE
)(context
->Esp
+ 4),sizeof(DWORD
)*16);
346 DPRINTF(") ret=%08lx\n",(DWORD
)ret
->origreturn
);
350 void WINAPI
SNOOP_DoReturn( CONTEXT86
*context
)
352 SNOOP_RETURNENTRY
*ret
= (SNOOP_RETURNENTRY
*)(context
->Eip
- 5);
354 /* We haven't found out the nrofargs yet. If we called a cdecl
355 * function it is too late anyway and we can just set '0' (which
356 * will be the difference between orig and current ESP
357 * If stdcall -> everything ok.
359 if (ret
->dll
->funs
[ret
->ordinal
].nrofargs
<0)
360 ret
->dll
->funs
[ret
->ordinal
].nrofargs
=(context
->Esp
- ret
->origESP
-4)/4;
361 context
->Eip
= (DWORD
)ret
->origreturn
;
365 DPRINTF("%08lx:RET %s.%ld: %s(",
366 GetCurrentThreadId(),
367 ret
->dll
->name
,ret
->dll
->ordbase
+ret
->ordinal
,ret
->dll
->funs
[ret
->ordinal
].name
);
368 max
= ret
->dll
->funs
[ret
->ordinal
].nrofargs
;
373 SNOOP_PrintArg(ret
->args
[i
]);
374 if (i
<max
-1) DPRINTF(",");
376 DPRINTF(") retval = %08lx ret=%08lx\n",
377 context
->Eax
,(DWORD
)ret
->origreturn
);
378 HeapFree(GetProcessHeap(),0,ret
->args
);
381 DPRINTF("%08lx:RET %s.%ld: %s() retval = %08lx ret=%08lx\n",
382 GetCurrentThreadId(),
383 ret
->dll
->name
,ret
->dll
->ordbase
+ret
->ordinal
,ret
->dll
->funs
[ret
->ordinal
].name
,
384 context
->Eax
, (DWORD
)ret
->origreturn
);
385 ret
->origreturn
= NULL
; /* mark as empty */
388 /* assembly wrappers that save the context */
389 __ASM_GLOBAL_FUNC( SNOOP_Entry
,
390 "call " __ASM_NAME("__wine_call_from_32_regs") "\n\t"
391 ".long " __ASM_NAME("SNOOP_DoEntry") ",0" );
392 __ASM_GLOBAL_FUNC( SNOOP_Return
,
393 "call " __ASM_NAME("__wine_call_from_32_regs") "\n\t"
394 ".long " __ASM_NAME("SNOOP_DoReturn") ",0" );
396 #else /* !__i386__ */
397 void SNOOP_RegisterDLL(HMODULE hmod
,LPCSTR name
,DWORD nrofordinals
, DWORD dw
) {
398 if (!TRACE_ON(snoop
)) return;
399 FIXME("snooping works only on i386 for now.\n");
402 FARPROC
SNOOP_GetProcAddress(HMODULE hmod
,LPCSTR name
,DWORD ordinal
,FARPROC origfun
) {
405 #endif /* !__i386__ */