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[wine/gsoc_dplay.git] / relay32 / snoop.c
blob37b978e6ce08fcfdd0e015a9f2e198030da14bf8
1 /*
2 * 386-specific Win32 dll<->dll snooping functions
3 *
4 * Copyright 1998 Marcus Meissner
5 */
6
7 #include "config.h"
8
9 #include <assert.h>
10 #include <stdio.h>
11 #include <string.h>
12 #include "winbase.h"
13 #include "winnt.h"
14 #include "heap.h"
15 #include "snoop.h"
16 #include "selectors.h"
17 #include "stackframe.h"
18 #include "debugtools.h"
19 #include "wine/exception.h"
20
21 DEFAULT_DEBUG_CHANNEL(snoop);
22
23 static WINE_EXCEPTION_FILTER(page_fault)
24 {
25 if (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ||
26 GetExceptionCode() == EXCEPTION_PRIV_INSTRUCTION)
27 return EXCEPTION_EXECUTE_HANDLER;
28 return EXCEPTION_CONTINUE_SEARCH;
29 }
30
31 char **debug_snoop_excludelist = NULL, **debug_snoop_includelist = NULL;
32
33 #ifdef __i386__
34
35 extern void WINAPI SNOOP_Entry();
36 extern void WINAPI SNOOP_Return();
37
38 #ifdef NEED_UNDERSCORE_PREFIX
39 # define PREFIX "_"
40 #else
41 # define PREFIX
42 #endif
43
44 #include "pshpack1.h"
45
46 typedef struct tagSNOOP_FUN {
47 /* code part */
48 BYTE lcall; /* 0xe8 call snoopentry (relative) */
49 /* NOTE: If you move snoopentry OR nrofargs fix the relative offset
50 * calculation!
51 */
52 DWORD snoopentry; /* SNOOP_Entry relative */
53 /* unreached */
54 int nrofargs;
55 FARPROC origfun;
56 char *name;
57 } SNOOP_FUN;
58
59 typedef struct tagSNOOP_DLL {
60 HMODULE hmod;
61 SNOOP_FUN *funs;
62 LPCSTR name;
63 DWORD nrofordinals;
64 struct tagSNOOP_DLL *next;
65 } SNOOP_DLL;
66 typedef struct tagSNOOP_RETURNENTRY {
67 /* code part */
68 BYTE lcall; /* 0xe8 call snoopret relative*/
69 /* NOTE: If you move snoopret OR origreturn fix the relative offset
70 * calculation!
71 */
72 DWORD snoopret; /* SNOOP_Ret relative */
73 /* unreached */
74 FARPROC origreturn;
75 SNOOP_DLL *dll;
76 DWORD ordinal;
77 DWORD origESP;
78 DWORD *args; /* saved args across a stdcall */
79 } SNOOP_RETURNENTRY;
80
81 typedef struct tagSNOOP_RETURNENTRIES {
82 SNOOP_RETURNENTRY entry[4092/sizeof(SNOOP_RETURNENTRY)];
83 struct tagSNOOP_RETURNENTRIES *next;
84 } SNOOP_RETURNENTRIES;
85
86 #include "poppack.h"
87
88 static SNOOP_DLL *firstdll = NULL;
89 static SNOOP_RETURNENTRIES *firstrets = NULL;
90
91 /***********************************************************************
92 * SNOOP_ShowDebugmsgSnoop
93 *
94 * Simple function to decide if a particular debugging message is
95 * wanted.
96 */
97 int SNOOP_ShowDebugmsgSnoop(const char *dll, int ord, const char *fname) {
98
99 if(debug_snoop_excludelist || debug_snoop_includelist) {
100 char **listitem;
101 char buf[80];
102 int len, len2, itemlen, show;
103
104 if(debug_snoop_excludelist) {
105 show = 1;
106 listitem = debug_snoop_excludelist;
107 } else {
108 show = 0;
109 listitem = debug_snoop_includelist;
110 }
111 len = strlen(dll);
112 assert(len < 64);
113 sprintf(buf, "%s.%d", dll, ord);
114 len2 = strlen(buf);
115 for(; *listitem; listitem++) {
116 itemlen = strlen(*listitem);
117 if((itemlen == len && !strncmp(*listitem, buf, len)) ||
118 (itemlen == len2 && !strncmp(*listitem, buf, len2)) ||
119 !strcmp(*listitem, fname)) {
120 show = !show;
121 break;
122 }
123 }
124 return show;
125 }
126 return 1;
127 }
128
129 void
130 SNOOP_RegisterDLL(HMODULE hmod,LPCSTR name,DWORD nrofordinals) {
131 SNOOP_DLL **dll = &(firstdll);
132 char *s;
133
134 if (!TRACE_ON(snoop)) return;
135 while (*dll) {
136 if ((*dll)->hmod == hmod)
137 return; /* already registered */
138 dll = &((*dll)->next);
139 }
140 *dll = (SNOOP_DLL*)HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,sizeof(SNOOP_DLL));
141 (*dll)->next = NULL;
142 (*dll)->hmod = hmod;
143 (*dll)->nrofordinals = nrofordinals;
144 (*dll)->name = HEAP_strdupA(GetProcessHeap(),0,name);
145 if ((s=strrchr((*dll)->name,'.')))
146 *s='\0';
147 (*dll)->funs = VirtualAlloc(NULL,nrofordinals*sizeof(SNOOP_FUN),MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
148 memset((*dll)->funs,0,nrofordinals*sizeof(SNOOP_FUN));
149 if (!(*dll)->funs) {
150 HeapFree(GetProcessHeap(),0,*dll);
151 FIXME("out of memory\n");
152 return;
153 }
154 }
155
156 FARPROC
157 SNOOP_GetProcAddress(HMODULE hmod,LPCSTR name,DWORD ordinal,FARPROC origfun) {
158 SNOOP_DLL *dll = firstdll;
159 SNOOP_FUN *fun;
160 int j;
161 IMAGE_SECTION_HEADER *pe_seg = PE_SECTIONS(hmod);
162
163 if (!TRACE_ON(snoop)) return origfun;
164 if (!*(LPBYTE)origfun) /* 0x00 is an imposs. opcode, poss. dataref. */
165 return origfun;
166 for (j=0;j<PE_HEADER(hmod)->FileHeader.NumberOfSections;j++)
167 /* 0x42 is special ELF loader tag */
168 if ((pe_seg[j].VirtualAddress==0x42) ||
169 (((DWORD)origfun-hmod>=pe_seg[j].VirtualAddress)&&
170 ((DWORD)origfun-hmod <pe_seg[j].VirtualAddress+
171 pe_seg[j].SizeOfRawData
172 ))
173 )
174 break;
175 /* If we looked through all sections (and didn't find one)
176 * or if the sectionname contains "data", we return the
177 * original function since it is most likely a datareference.
178 */
179 if ( (j==PE_HEADER(hmod)->FileHeader.NumberOfSections) ||
180 (strstr(pe_seg[j].Name,"data")) ||
181 !(pe_seg[j].Characteristics & IMAGE_SCN_CNT_CODE)
182 )
183 return origfun;
184
185 while (dll) {
186 if (hmod == dll->hmod)
187 break;
188 dll=dll->next;
189 }
190 if (!dll) /* probably internal */
191 return origfun;
192 if (!SNOOP_ShowDebugmsgSnoop(dll->name,ordinal,name))
193 return origfun;
194 assert(ordinal < dll->nrofordinals);
195 fun = dll->funs+ordinal;
196 if (!fun->name) fun->name = HEAP_strdupA(GetProcessHeap(),0,name);
197 fun->lcall = 0xe8;
198 /* NOTE: origreturn struct member MUST come directly after snoopentry */
199 fun->snoopentry = (char*)SNOOP_Entry-((char*)(&fun->nrofargs));
200 fun->origfun = origfun;
201 fun->nrofargs = -1;
202 return (FARPROC)&(fun->lcall);
203 }
204
205 static char*
206 SNOOP_PrintArg(DWORD x) {
207 static char buf[200];
208 int i,nostring;
209 char * volatile ret=0;
210
211 if ( !HIWORD(x) ) { /* trivial reject to avoid faults */
212 sprintf(buf,"%08lx",x);
213 return buf;
214 }
215 __TRY{
216 LPBYTE s=(LPBYTE)x;
217 i=0;nostring=0;
218 while (i<80) {
219 if (s[i]==0) break;
220 if (s[i]<0x20) {nostring=1;break;}
221 if (s[i]>=0x80) {nostring=1;break;}
222 i++;
223 }
224 if (!nostring) {
225 if (i>5) {
226 snprintf(buf,sizeof(buf),"%08lx %s",x,debugstr_an((LPSTR)x,sizeof(buf)-10));
227 ret=buf;
228 }
229 }
230 }
231 __EXCEPT(page_fault){}
232 __ENDTRY
233 if (ret)
234 return ret;
235 __TRY{
236 LPWSTR s=(LPWSTR)x;
237 i=0;nostring=0;
238 while (i<80) {
239 if (s[i]==0) break;
240 if (s[i]<0x20) {nostring=1;break;}
241 if (s[i]>0x100) {nostring=1;break;}
242 i++;
243 }
244 if (!nostring) {
245 if (i>5) {
246 snprintf(buf,sizeof(buf),"%08lx %s",x,debugstr_wn((LPWSTR)x,sizeof(buf)-10));
247 ret=buf;
248 }
249 }
250 }
251 __EXCEPT(page_fault){}
252 __ENDTRY
253 if (ret)
254 return ret;
255 sprintf(buf,"%08lx",x);
256 return buf;
257 }
258
259 #define CALLER1REF (*(DWORD*)context->Esp)
260
261 void WINAPI SNOOP_DoEntry( CONTEXT86 *context );
262 DEFINE_REGS_ENTRYPOINT_0( SNOOP_Entry, SNOOP_DoEntry );
263 void WINAPI SNOOP_DoEntry( CONTEXT86 *context )
264 {
265 DWORD ordinal=0,entry = context->Eip - 5;
266 SNOOP_DLL *dll = firstdll;
267 SNOOP_FUN *fun = NULL;
268 SNOOP_RETURNENTRIES **rets = &firstrets;
269 SNOOP_RETURNENTRY *ret;
270 int i=0, max;
271
272 while (dll) {
273 if ( ((char*)entry>=(char*)dll->funs) &&
274 ((char*)entry<=(char*)(dll->funs+dll->nrofordinals))
275 ) {
276 fun = (SNOOP_FUN*)entry;
277 ordinal = fun-dll->funs;
278 break;
279 }
280 dll=dll->next;
281 }
282 if (!dll) {
283 FIXME("entrypoint 0x%08lx not found\n",entry);
284 return; /* oops */
285 }
286 /* guess cdecl ... */
287 if (fun->nrofargs<0) {
288 /* Typical cdecl return frame is:
289 * add esp, xxxxxxxx
290 * which has (for xxxxxxxx up to 255 the opcode "83 C4 xx".
291 * (after that 81 C2 xx xx xx xx)
292 */
293 LPBYTE reteip = (LPBYTE)CALLER1REF;
294
295 if (reteip) {
296 if ((reteip[0]==0x83)&&(reteip[1]==0xc4))
297 fun->nrofargs=reteip[2]/4;
298 }
299 }
300
301
302 while (*rets) {
303 for (i=0;i<sizeof((*rets)->entry)/sizeof((*rets)->entry[0]);i++)
304 if (!(*rets)->entry[i].origreturn)
305 break;
306 if (i!=sizeof((*rets)->entry)/sizeof((*rets)->entry[0]))
307 break;
308 rets = &((*rets)->next);
309 }
310 if (!*rets) {
311 *rets = VirtualAlloc(NULL,4096,MEM_COMMIT|MEM_RESERVE,PAGE_EXECUTE_READWRITE);
312 memset(*rets,0,4096);
313 i = 0; /* entry 0 is free */
314 }
315 ret = &((*rets)->entry[i]);
316 ret->lcall = 0xe8;
317 /* NOTE: origreturn struct member MUST come directly after snoopret */
318 ret->snoopret = ((char*)SNOOP_Return)-(char*)(&ret->origreturn);
319 ret->origreturn = (FARPROC)CALLER1REF;
320 CALLER1REF = (DWORD)&ret->lcall;
321 ret->dll = dll;
322 ret->args = NULL;
323 ret->ordinal = ordinal;
324 ret->origESP = context->Esp;
325
326 context->Eip = (DWORD)fun->origfun;
327
328 DPRINTF("CALL %s.%ld: %s(",dll->name,ordinal,fun->name);
329 if (fun->nrofargs>0) {
330 max = fun->nrofargs; if (max>16) max=16;
331 for (i=0;i<max;i++)
332 DPRINTF("%s%s",SNOOP_PrintArg(*(DWORD*)(context->Esp + 4 + sizeof(DWORD)*i)),(i<fun->nrofargs-1)?",":"");
333 if (max!=fun->nrofargs)
334 DPRINTF(" ...");
335 } else if (fun->nrofargs<0) {
336 DPRINTF("<unknown, check return>");
337 ret->args = HeapAlloc(GetProcessHeap(),0,16*sizeof(DWORD));
338 memcpy(ret->args,(LPBYTE)(context->Esp + 4),sizeof(DWORD)*16);
339 }
340 DPRINTF(") ret=%08lx fs=%04lx\n",(DWORD)ret->origreturn,context->SegFs);
341 }
342
343 void WINAPI SNOOP_DoReturn( CONTEXT86 *context );
344 DEFINE_REGS_ENTRYPOINT_0( SNOOP_Return, SNOOP_DoReturn );
345 void WINAPI SNOOP_DoReturn( CONTEXT86 *context )
346 {
347 SNOOP_RETURNENTRY *ret = (SNOOP_RETURNENTRY*)(context->Eip - 5);
348
349 /* We haven't found out the nrofargs yet. If we called a cdecl
350 * function it is too late anyway and we can just set '0' (which
351 * will be the difference between orig and current ESP
352 * If stdcall -> everything ok.
353 */
354 if (ret->dll->funs[ret->ordinal].nrofargs<0)
355 ret->dll->funs[ret->ordinal].nrofargs=(context->Esp - ret->origESP-4)/4;
356 context->Eip = (DWORD)ret->origreturn;
357 if (ret->args) {
358 int i,max;
359
360 DPRINTF("RET %s.%ld: %s(",ret->dll->name,ret->ordinal,ret->dll->funs[ret->ordinal].name);
361 max = ret->dll->funs[ret->ordinal].nrofargs;
362 if (max>16) max=16;
363
364 for (i=0;i<max;i++)
365 DPRINTF("%s%s",SNOOP_PrintArg(ret->args[i]),(i<max-1)?",":"");
366 DPRINTF(") retval = %08lx ret=%08lx fs=%04lx\n",
367 context->Eax,(DWORD)ret->origreturn,context->SegFs );
368 HeapFree(GetProcessHeap(),0,ret->args);
369 ret->args = NULL;
370 } else
371 DPRINTF("RET %s.%ld: %s() retval = %08lx ret=%08lx fs=%04lx\n",
372 ret->dll->name,ret->ordinal,ret->dll->funs[ret->ordinal].name,
373 context->Eax,(DWORD)ret->origreturn,context->SegFs );
374 ret->origreturn = NULL; /* mark as empty */
375 }
376 #else /* !__i386__ */
377 void SNOOP_RegisterDLL(HMODULE hmod,LPCSTR name,DWORD nrofordinals) {
378 FIXME("snooping works only on i386 for now.\n");
379 return;
380 }
381
382 FARPROC SNOOP_GetProcAddress(HMODULE hmod,LPCSTR name,DWORD ordinal,FARPROC origfun) {
383 return origfun;
384 }
385 #endif /* !__i386__ */
DirectPlay implementation for GSoC