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dplayx/tests: Fix compilation on systems that don't support nameless unions.
[wine.git] / dlls / kernel32 / snoop16.c
blob210f74c3c81c30a0d7b460923b3f4cb01f897e37
1 /*
2 * 386-specific Win16 dll<->dll snooping functions
3 *
4 * Copyright 1998 Marcus Meissner
5 *
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.
10 *
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.
15 *
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
19 */
20
21 #include "config.h"
22 #include "wine/port.h"
23
24 #include <assert.h>
25 #include <string.h>
26 #include <stdarg.h>
27 #include <stdio.h>
28 #include "windef.h"
29 #include "winbase.h"
30 #include "winnt.h"
31 #include "wine/winbase16.h"
32 #include "winternl.h"
33 #include "wine/library.h"
34 #include "kernel_private.h"
35 #include "kernel16_private.h"
36 #include "toolhelp.h"
37 #include "wine/debug.h"
38
39 WINE_DEFAULT_DEBUG_CHANNEL(snoop);
40
41 #ifdef __i386__
42
43 #include "pshpack1.h"
44
45 void WINAPI SNOOP16_Entry(FARPROC proc, LPBYTE args, CONTEXT86 *context);
46 void WINAPI SNOOP16_Return(FARPROC proc, LPBYTE args, CONTEXT86 *context);
47
48 typedef struct tagSNOOP16_FUN {
49 /* code part */
50 BYTE lcall; /* 0x9a call absolute with segment */
51 DWORD snr;
52 /* unreached */
53 int nrofargs;
54 FARPROC16 origfun;
55 char *name;
56 } SNOOP16_FUN;
57
58 typedef struct tagSNOOP16_DLL {
59 HMODULE16 hmod;
60 HANDLE16 funhandle;
61 SNOOP16_FUN *funs;
62 struct tagSNOOP16_DLL *next;
63 char name[1];
64 } SNOOP16_DLL;
65
66 typedef struct tagSNOOP16_RETURNENTRY {
67 /* code part */
68 BYTE lcall; /* 0x9a call absolute with segment */
69 DWORD snr;
70 /* unreached */
71 FARPROC16 origreturn;
72 SNOOP16_DLL *dll;
73 DWORD ordinal;
74 WORD origSP;
75 WORD *args; /* saved args across a stdcall */
76 } SNOOP16_RETURNENTRY;
77
78 typedef struct tagSNOOP16_RETURNENTRIES {
79 SNOOP16_RETURNENTRY entry[65500/sizeof(SNOOP16_RETURNENTRY)];
80 HANDLE16 rethandle;
81 struct tagSNOOP16_RETURNENTRIES *next;
82 } SNOOP16_RETURNENTRIES;
83
84 typedef struct tagSNOOP16_RELAY {
85 WORD pushbp; /* 0x5566 */
86 BYTE pusheax; /* 0x50 */
87 WORD pushax; /* 0x5066 */
88 BYTE pushl; /* 0x68 */
89 DWORD realfun; /* SNOOP16_Return */
90 BYTE lcall; /* 0x9a call absolute with segment */
91 DWORD callfromregs;
92 WORD seg;
93 WORD lret; /* 0xcb66 */
94 } SNOOP16_RELAY;
95
96 #include "poppack.h"
97
98 static SNOOP16_DLL *firstdll = NULL;
99 static SNOOP16_RETURNENTRIES *firstrets = NULL;
100 static SNOOP16_RELAY *snr;
101 static HANDLE16 xsnr = 0;
102
103 void
104 SNOOP16_RegisterDLL(HMODULE16 hModule,LPCSTR name) {
105 SNOOP16_DLL **dll = &(firstdll);
106 char *s;
107
108 if (!TRACE_ON(snoop)) return;
109
110 TRACE("hmod=%x, name=%s\n", hModule, name);
111
112 if (!snr) {
113 xsnr=GLOBAL_Alloc(GMEM_ZEROINIT,2*sizeof(*snr),0,WINE_LDT_FLAGS_CODE|WINE_LDT_FLAGS_32BIT);
114 snr = GlobalLock16(xsnr);
115 snr[0].pushbp = 0x5566;
116 snr[0].pusheax = 0x50;
117 snr[0].pushax = 0x5066;
118 snr[0].pushl = 0x68;
119 snr[0].realfun = (DWORD)SNOOP16_Entry;
120 snr[0].lcall = 0x9a;
121 snr[0].callfromregs = (DWORD)__wine_call_from_16_regs;
122 snr[0].seg = wine_get_cs();
123 snr[0].lret = 0xcb66;
124
125 snr[1].pushbp = 0x5566;
126 snr[1].pusheax = 0x50;
127 snr[1].pushax = 0x5066;
128 snr[1].pushl = 0x68;
129 snr[1].realfun = (DWORD)SNOOP16_Return;
130 snr[1].lcall = 0x9a;
131 snr[1].callfromregs = (DWORD)__wine_call_from_16_regs;
132 snr[1].seg = wine_get_cs();
133 snr[1].lret = 0xcb66;
134 }
135 while (*dll) {
136 if ((*dll)->hmod == hModule)
137 {
138 /* another dll, loaded at the same address */
139 GlobalUnlock16((*dll)->funhandle);
140 GlobalFree16((*dll)->funhandle);
141 break;
142 }
143 dll = &((*dll)->next);
144 }
145
146 if (*dll)
147 *dll = HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, *dll, sizeof(SNOOP16_DLL)+strlen(name));
148 else
149 *dll = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(SNOOP16_DLL)+strlen(name));
150
151 (*dll)->next = NULL;
152 (*dll)->hmod = hModule;
153 if ((s=strrchr(name,'\\')))
154 name = s+1;
155 strcpy( (*dll)->name, name );
156 if ((s=strrchr((*dll)->name,'.')))
157 *s='\0';
158 (*dll)->funhandle = GlobalHandleToSel16(GLOBAL_Alloc(GMEM_ZEROINIT,65535,0,WINE_LDT_FLAGS_CODE));
159 (*dll)->funs = GlobalLock16((*dll)->funhandle);
160 if (!(*dll)->funs) {
161 HeapFree(GetProcessHeap(),0,*dll);
162 FIXME("out of memory\n");
163 return;
164 }
165 }
166
167 FARPROC16
168 SNOOP16_GetProcAddress16(HMODULE16 hmod,DWORD ordinal,FARPROC16 origfun) {
169 SNOOP16_DLL *dll = firstdll;
170 SNOOP16_FUN *fun;
171 NE_MODULE *pModule = NE_GetPtr(hmod);
172 unsigned char *cpnt;
173 char name[200];
174
175 if (!TRACE_ON(snoop) || !pModule || !HIWORD(origfun))
176 return origfun;
177 if (!*(LPBYTE)MapSL((SEGPTR)origfun)) /* 0x00 is an impossible opcode, possible dataref. */
178 return origfun;
179 while (dll) {
180 if (hmod == dll->hmod)
181 break;
182 dll=dll->next;
183 }
184 if (!dll) /* probably internal */
185 return origfun;
186 if (ordinal>65535/sizeof(SNOOP16_FUN))
187 return origfun;
188 fun = dll->funs+ordinal;
189 /* already done? */
190 fun->lcall = 0x9a;
191 fun->snr = MAKELONG(0,xsnr);
192 fun->origfun = origfun;
193 if (fun->name)
194 return (FARPROC16)(SEGPTR)MAKELONG(((char*)fun-(char*)dll->funs),dll->funhandle);
195 cpnt = (unsigned char *)pModule + pModule->ne_restab;
196 while (*cpnt) {
197 cpnt += *cpnt + 1 + sizeof(WORD);
198 if (*(WORD*)(cpnt+*cpnt+1) == ordinal) {
199 sprintf(name,"%.*s",*cpnt,cpnt+1);
200 break;
201 }
202 }
203 /* Now search the non-resident names table */
204
205 if (!*cpnt && pModule->nrname_handle) {
206 cpnt = (unsigned char *)GlobalLock16( pModule->nrname_handle );
207 while (*cpnt) {
208 cpnt += *cpnt + 1 + sizeof(WORD);
209 if (*(WORD*)(cpnt+*cpnt+1) == ordinal) {
210 sprintf(name,"%.*s",*cpnt,cpnt+1);
211 break;
212 }
213 }
214 }
215 if (*cpnt)
216 {
217 fun->name = HeapAlloc(GetProcessHeap(),0,strlen(name)+1);
218 strcpy( fun->name, name );
219 }
220 else
221 fun->name = HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,1); /* empty string */
222
223 if (!SNOOP16_ShowDebugmsgSnoop(dll->name, ordinal, fun->name))
224 return origfun;
225
226 /* more magic. do not try to snoop thunk data entries (MMSYSTEM) */
227 if (strchr(fun->name,'_')) {
228 char *s=strchr(fun->name,'_');
229
230 if (!strncasecmp(s,"_thunkdata",10)) {
231 HeapFree(GetProcessHeap(),0,fun->name);
232 fun->name = NULL;
233 return origfun;
234 }
235 }
236 fun->lcall = 0x9a;
237 fun->snr = MAKELONG(0,xsnr);
238 fun->origfun = origfun;
239 fun->nrofargs = -1;
240 return (FARPROC16)(SEGPTR)MAKELONG(((char*)fun-(char*)dll->funs),dll->funhandle);
241 }
242
243 #define CALLER1REF (*(DWORD*)(MapSL( MAKESEGPTR(context->SegSs,LOWORD(context->Esp)+4))))
244 void WINAPI SNOOP16_Entry(FARPROC proc, LPBYTE args, CONTEXT86 *context) {
245 DWORD ordinal=0;
246 DWORD entry=(DWORD)MapSL( MAKESEGPTR(context->SegCs,LOWORD(context->Eip)) )-5;
247 WORD xcs = context->SegCs;
248 SNOOP16_DLL *dll = firstdll;
249 SNOOP16_FUN *fun = NULL;
250 SNOOP16_RETURNENTRIES **rets = &firstrets;
251 SNOOP16_RETURNENTRY *ret;
252 unsigned i=0;
253 int max;
254
255 while (dll) {
256 if (xcs == dll->funhandle) {
257 fun = (SNOOP16_FUN*)entry;
258 ordinal = fun-dll->funs;
259 break;
260 }
261 dll=dll->next;
262 }
263 if (!dll) {
264 FIXME("entrypoint 0x%08x not found\n",entry);
265 return; /* oops */
266 }
267 while (*rets) {
268 for (i=0;i<sizeof((*rets)->entry)/sizeof((*rets)->entry[0]);i++)
269 if (!(*rets)->entry[i].origreturn)
270 break;
271 if (i!=sizeof((*rets)->entry)/sizeof((*rets)->entry[0]))
272 break;
273 rets = &((*rets)->next);
274 }
275 if (!*rets) {
276 HANDLE16 hand = GlobalHandleToSel16(GLOBAL_Alloc(GMEM_ZEROINIT,65535,0,WINE_LDT_FLAGS_CODE));
277 *rets = GlobalLock16(hand);
278 (*rets)->rethandle = hand;
279 i = 0; /* entry 0 is free */
280 }
281 ret = &((*rets)->entry[i]);
282 ret->lcall = 0x9a;
283 ret->snr = MAKELONG(sizeof(SNOOP16_RELAY),xsnr);
284 ret->origreturn = (FARPROC16)CALLER1REF;
285 CALLER1REF = MAKELONG((char*)&(ret->lcall)-(char*)((*rets)->entry),(*rets)->rethandle);
286 ret->dll = dll;
287 ret->args = NULL;
288 ret->ordinal = ordinal;
289 ret->origSP = LOWORD(context->Esp);
290
291 context->Eip= LOWORD(fun->origfun);
292 context->SegCs = HIWORD(fun->origfun);
293
294
295 DPRINTF("%04x:CALL %s.%d: %s(",GetCurrentThreadId(), dll->name,ordinal,fun->name);
296 if (fun->nrofargs>0) {
297 max = fun->nrofargs;
298 if (max>16) max=16;
299 for (i=max;i--;)
300 DPRINTF("%04x%s",*(WORD*)((char *) MapSL( MAKESEGPTR(context->SegSs,LOWORD(context->Esp)) )+8+sizeof(WORD)*i),i?",":"");
301 if (max!=fun->nrofargs)
302 DPRINTF(" ...");
303 } else if (fun->nrofargs<0) {
304 DPRINTF("<unknown, check return>");
305 ret->args = HeapAlloc(GetProcessHeap(),0,16*sizeof(WORD));
306 memcpy(ret->args,(LPBYTE)((char *) MapSL( MAKESEGPTR(context->SegSs,LOWORD(context->Esp)) )+8),sizeof(WORD)*16);
307 }
308 DPRINTF(") ret=%04x:%04x\n",HIWORD(ret->origreturn),LOWORD(ret->origreturn));
309 }
310
311 void WINAPI SNOOP16_Return(FARPROC proc, LPBYTE args, CONTEXT86 *context) {
312 SNOOP16_RETURNENTRY *ret = (SNOOP16_RETURNENTRY*)((char *) MapSL( MAKESEGPTR(context->SegCs,LOWORD(context->Eip)) )-5);
313
314 /* We haven't found out the nrofargs yet. If we called a cdecl
315 * function it is too late anyway and we can just set '0' (which
316 * will be the difference between orig and current SP
317 * If pascal -> everything ok.
318 */
319 if (ret->dll->funs[ret->ordinal].nrofargs<0) {
320 ret->dll->funs[ret->ordinal].nrofargs=(LOWORD(context->Esp)-ret->origSP-4)/2;
321 }
322 context->Eip = LOWORD(ret->origreturn);
323 context->SegCs = HIWORD(ret->origreturn);
324 DPRINTF("%04x:RET %s.%d: %s(",
325 GetCurrentThreadId(),ret->dll->name,ret->ordinal,
326 ret->dll->funs[ret->ordinal].name);
327 if (ret->args) {
328 int i,max;
329
330 max = ret->dll->funs[ret->ordinal].nrofargs;
331 if (max>16)
332 max=16;
333 if (max<0)
334 max=0;
335
336 for (i=max;i--;)
337 DPRINTF("%04x%s",ret->args[i],i?",":"");
338 if (max!=ret->dll->funs[ret->ordinal].nrofargs)
339 DPRINTF(" ...");
340 HeapFree(GetProcessHeap(),0,ret->args);
341 ret->args = NULL;
342 }
343 DPRINTF(") retval = %04x:%04x ret=%04x:%04x\n",
344 (WORD)context->Edx,(WORD)context->Eax,
345 HIWORD(ret->origreturn),LOWORD(ret->origreturn));
346 ret->origreturn = NULL; /* mark as empty */
347 }
348 #else /* !__i386__ */
349 void SNOOP16_RegisterDLL(HMODULE16 hModule,LPCSTR name) {
350 if (!TRACE_ON(snoop)) return;
351 FIXME("snooping works only on i386 for now.\n");
352 }
353
354 FARPROC16 SNOOP16_GetProcAddress16(HMODULE16 hmod,DWORD ordinal,FARPROC16 origfun) {
355 return origfun;
356 }
357 #endif /* !__i386__ */
Windows API implementation