jscript: Return 'unknown' in typeof operator for native object's values that can...
[wine] / dlls / krnl386.exe16 / snoop.c
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 "kernel16_private.h"
35 #include "wine/debug.h"
36
37 WINE_DEFAULT_DEBUG_CHANNEL(snoop);
38
39 #include "pshpack1.h"
40
41 static void WINAPI SNOOP16_Entry(FARPROC proc, LPBYTE args, CONTEXT *context);
42 static void WINAPI SNOOP16_Return(FARPROC proc, LPBYTE args, CONTEXT *context);
43
44 typedef struct tagSNOOP16_FUN {
45         /* code part */
46         BYTE            lcall;          /* 0x9a call absolute with segment */
47         DWORD           snr;
48         /* unreached */
49         int             nrofargs;
50         FARPROC16       origfun;
51         char            *name;
52 } SNOOP16_FUN;
53
54 typedef struct tagSNOOP16_DLL {
55         HMODULE16       hmod;
56         HANDLE16        funhandle;
57         SNOOP16_FUN     *funs;
58         struct tagSNOOP16_DLL   *next;
59         char name[1];
60 } SNOOP16_DLL;
61
62 typedef struct tagSNOOP16_RETURNENTRY {
63         /* code part */
64         BYTE            lcall;          /* 0x9a call absolute with segment */
65         DWORD           snr;
66         /* unreached */
67         FARPROC16       origreturn;
68         SNOOP16_DLL     *dll;
69         DWORD           ordinal;
70         WORD            origSP;
71         WORD            *args;          /* saved args across a stdcall */
72 } SNOOP16_RETURNENTRY;
73
74 typedef struct tagSNOOP16_RETURNENTRIES {
75         SNOOP16_RETURNENTRY entry[65500/sizeof(SNOOP16_RETURNENTRY)];
76         HANDLE16        rethandle;
77         struct tagSNOOP16_RETURNENTRIES *next;
78 } SNOOP16_RETURNENTRIES;
79
80 typedef struct tagSNOOP16_RELAY {
81         WORD            pushbp;         /* 0x5566 */
82         BYTE            pusheax;        /* 0x50 */
83         WORD            pushax;         /* 0x5066 */
84         BYTE            pushl;          /* 0x68 */
85         DWORD           realfun;        /* SNOOP16_Return */
86         BYTE            lcall;          /* 0x9a call absolute with segment */
87         DWORD           callfromregs;
88         WORD            seg;
89         WORD            lret;           /* 0xcb66 */
90 } SNOOP16_RELAY;
91
92 #include "poppack.h"
93
94 static  SNOOP16_DLL             *firstdll = NULL;
95 static  SNOOP16_RETURNENTRIES   *firstrets = NULL;
96 static  SNOOP16_RELAY           *snr;
97 static  HANDLE16                xsnr = 0;
98
99 void
100 SNOOP16_RegisterDLL(HMODULE16 hModule,LPCSTR name) {
101         SNOOP16_DLL     **dll = &(firstdll);
102         char            *s;
103
104         if (!TRACE_ON(snoop)) return;
105
106         TRACE("hmod=%x, name=%s\n", hModule, name);
107
108         if (!snr) {
109                 xsnr=GLOBAL_Alloc(GMEM_ZEROINIT,2*sizeof(*snr),0,WINE_LDT_FLAGS_CODE|WINE_LDT_FLAGS_32BIT);
110                 snr = GlobalLock16(xsnr);
111                 snr[0].pushbp   = 0x5566;
112                 snr[0].pusheax  = 0x50;
113                 snr[0].pushax   = 0x5066;
114                 snr[0].pushl    = 0x68;
115                 snr[0].realfun  = (DWORD)SNOOP16_Entry;
116                 snr[0].lcall    = 0x9a;
117                 snr[0].callfromregs = (DWORD)__wine_call_from_16_regs;
118                 snr[0].seg      = wine_get_cs();
119                 snr[0].lret     = 0xcb66;
120
121                 snr[1].pushbp   = 0x5566;
122                 snr[1].pusheax  = 0x50;
123                 snr[1].pushax   = 0x5066;
124                 snr[1].pushl    = 0x68;
125                 snr[1].realfun  = (DWORD)SNOOP16_Return;
126                 snr[1].lcall    = 0x9a;
127                 snr[1].callfromregs = (DWORD)__wine_call_from_16_regs;
128                 snr[1].seg      = wine_get_cs();
129                 snr[1].lret     = 0xcb66;
130         }
131         while (*dll) {
132                 if ((*dll)->hmod == hModule)
133                 {
134                     /* another dll, loaded at the same address */
135                     GlobalUnlock16((*dll)->funhandle);
136                     GlobalFree16((*dll)->funhandle);
137                     break;
138                 }
139                 dll = &((*dll)->next);
140         }
141
142         if (*dll)
143                 *dll = HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, *dll, sizeof(SNOOP16_DLL)+strlen(name));
144         else
145                 *dll = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(SNOOP16_DLL)+strlen(name)); 
146
147         (*dll)->next    = NULL;
148         (*dll)->hmod    = hModule;
149         if ((s=strrchr(name,'\\')))
150                 name = s+1;
151         strcpy( (*dll)->name, name );
152         if ((s=strrchr((*dll)->name,'.')))
153                 *s='\0';
154         (*dll)->funhandle = GlobalHandleToSel16(GLOBAL_Alloc(GMEM_ZEROINIT,65535,0,WINE_LDT_FLAGS_CODE));
155         (*dll)->funs = GlobalLock16((*dll)->funhandle);
156         if (!(*dll)->funs) {
157                 HeapFree(GetProcessHeap(),0,*dll);
158                 FIXME("out of memory\n");
159                 return;
160         }
161 }
162
163 FARPROC16
164 SNOOP16_GetProcAddress16(HMODULE16 hmod,DWORD ordinal,FARPROC16 origfun) {
165         SNOOP16_DLL                     *dll = firstdll;
166         SNOOP16_FUN                     *fun;
167         NE_MODULE                       *pModule = NE_GetPtr(hmod);
168         unsigned char                   *cpnt;
169         char                            name[200];
170
171         if (!TRACE_ON(snoop) || !pModule || !HIWORD(origfun))
172                 return origfun;
173         if (!*(LPBYTE)MapSL((SEGPTR)origfun)) /* 0x00 is an impossible opcode, possible dataref. */
174                 return origfun;
175         while (dll) {
176                 if (hmod == dll->hmod)
177                         break;
178                 dll=dll->next;
179         }
180         if (!dll)       /* probably internal */
181                 return origfun;
182         if (ordinal>65535/sizeof(SNOOP16_FUN))
183                 return origfun;
184         fun = dll->funs+ordinal;
185         /* already done? */
186         fun->lcall      = 0x9a;
187         fun->snr        = MAKELONG(0,xsnr);
188         fun->origfun    = origfun;
189         if (fun->name)
190                 return (FARPROC16)(SEGPTR)MAKELONG(((char*)fun-(char*)dll->funs),dll->funhandle);
191         cpnt = (unsigned char *)pModule + pModule->ne_restab;
192         while (*cpnt) {
193                 cpnt += *cpnt + 1 + sizeof(WORD);
194                 if (*(WORD*)(cpnt+*cpnt+1) == ordinal) {
195                         sprintf(name,"%.*s",*cpnt,cpnt+1);
196                         break;
197                 }
198         }
199         /* Now search the non-resident names table */
200
201         if (!*cpnt && pModule->nrname_handle) {
202                 cpnt = GlobalLock16( pModule->nrname_handle );
203                 while (*cpnt) {
204                         cpnt += *cpnt + 1 + sizeof(WORD);
205                         if (*(WORD*)(cpnt+*cpnt+1) == ordinal) {
206                                     sprintf(name,"%.*s",*cpnt,cpnt+1);
207                                     break;
208                         }
209                 }
210         }
211         if (*cpnt)
212         {
213             fun->name = HeapAlloc(GetProcessHeap(),0,strlen(name)+1);
214             strcpy( fun->name, name );
215         }
216         else
217             fun->name = HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,1); /* empty string */
218
219         if (!SNOOP16_ShowDebugmsgSnoop(dll->name, ordinal, fun->name))
220                 return origfun;
221
222         /* more magic. do not try to snoop thunk data entries (MMSYSTEM) */
223         if (strchr(fun->name,'_')) {
224                 char *s=strchr(fun->name,'_');
225
226                 if (!strncasecmp(s,"_thunkdata",10)) {
227                         HeapFree(GetProcessHeap(),0,fun->name);
228                         fun->name = NULL;
229                         return origfun;
230                 }
231         }
232         fun->lcall      = 0x9a;
233         fun->snr        = MAKELONG(0,xsnr);
234         fun->origfun    = origfun;
235         fun->nrofargs   = -1;
236         return (FARPROC16)(SEGPTR)MAKELONG(((char*)fun-(char*)dll->funs),dll->funhandle);
237 }
238
239 #define CALLER1REF (*(DWORD*)(MapSL( MAKESEGPTR(context->SegSs,LOWORD(context->Esp)+4))))
240 static void WINAPI SNOOP16_Entry(FARPROC proc, LPBYTE args, CONTEXT *context) {
241         DWORD           ordinal=0;
242         DWORD           entry=(DWORD)MapSL( MAKESEGPTR(context->SegCs,LOWORD(context->Eip)) )-5;
243         WORD            xcs = context->SegCs;
244         SNOOP16_DLL     *dll = firstdll;
245         SNOOP16_FUN     *fun = NULL;
246         SNOOP16_RETURNENTRIES   **rets = &firstrets;
247         SNOOP16_RETURNENTRY     *ret;
248         unsigned        i=0;
249         int             max;
250
251         while (dll) {
252                 if (xcs == dll->funhandle) {
253                         fun = (SNOOP16_FUN*)entry;
254                         ordinal = fun-dll->funs;
255                         break;
256                 }
257                 dll=dll->next;
258         }
259         if (!dll) {
260                 FIXME("entrypoint 0x%08x not found\n",entry);
261                 return; /* oops */
262         }
263         while (*rets) {
264                 for (i=0;i<sizeof((*rets)->entry)/sizeof((*rets)->entry[0]);i++)
265                         if (!(*rets)->entry[i].origreturn)
266                                 break;
267                 if (i!=sizeof((*rets)->entry)/sizeof((*rets)->entry[0]))
268                         break;
269                 rets = &((*rets)->next);
270         }
271         if (!*rets) {
272                 HANDLE16 hand = GlobalHandleToSel16(GLOBAL_Alloc(GMEM_ZEROINIT,65535,0,WINE_LDT_FLAGS_CODE));
273                 *rets = GlobalLock16(hand);
274                 (*rets)->rethandle = hand;
275                 i = 0;  /* entry 0 is free */
276         }
277         ret = &((*rets)->entry[i]);
278         ret->lcall      = 0x9a;
279         ret->snr        = MAKELONG(sizeof(SNOOP16_RELAY),xsnr);
280         ret->origreturn = (FARPROC16)CALLER1REF;
281         CALLER1REF      = MAKELONG((char*)&(ret->lcall)-(char*)((*rets)->entry),(*rets)->rethandle);
282         ret->dll        = dll;
283         ret->args       = NULL;
284         ret->ordinal    = ordinal;
285         ret->origSP     = LOWORD(context->Esp);
286
287         context->Eip= LOWORD(fun->origfun);
288         context->SegCs = HIWORD(fun->origfun);
289
290
291         DPRINTF("%04x:CALL %s.%d: %s(",GetCurrentThreadId(), dll->name,ordinal,fun->name);
292         if (fun->nrofargs>0) {
293                 max = fun->nrofargs;
294                 if (max>16) max=16;
295                 for (i=max;i--;)
296                         DPRINTF("%04x%s",*(WORD*)((char *) MapSL( MAKESEGPTR(context->SegSs,LOWORD(context->Esp)) )+8+sizeof(WORD)*i),i?",":"");
297                 if (max!=fun->nrofargs)
298                         DPRINTF(" ...");
299         } else if (fun->nrofargs<0) {
300                 DPRINTF("<unknown, check return>");
301                 ret->args = HeapAlloc(GetProcessHeap(),0,16*sizeof(WORD));
302                 memcpy(ret->args,(LPBYTE)((char *) MapSL( MAKESEGPTR(context->SegSs,LOWORD(context->Esp)) )+8),sizeof(WORD)*16);
303         }
304         DPRINTF(") ret=%04x:%04x\n",HIWORD(ret->origreturn),LOWORD(ret->origreturn));
305 }
306
307 static void WINAPI SNOOP16_Return(FARPROC proc, LPBYTE args, CONTEXT *context) {
308         SNOOP16_RETURNENTRY     *ret = (SNOOP16_RETURNENTRY*)((char *) MapSL( MAKESEGPTR(context->SegCs,LOWORD(context->Eip)) )-5);
309
310         /* We haven't found out the nrofargs yet. If we called a cdecl
311          * function it is too late anyway and we can just set '0' (which
312          * will be the difference between orig and current SP
313          * If pascal -> everything ok.
314          */
315         if (ret->dll->funs[ret->ordinal].nrofargs<0) {
316                 ret->dll->funs[ret->ordinal].nrofargs=(LOWORD(context->Esp)-ret->origSP-4)/2;
317         }
318         context->Eip = LOWORD(ret->origreturn);
319         context->SegCs  = HIWORD(ret->origreturn);
320         DPRINTF("%04x:RET  %s.%d: %s(",
321                 GetCurrentThreadId(),ret->dll->name,ret->ordinal,
322                 ret->dll->funs[ret->ordinal].name);
323         if (ret->args) {
324                 int     i,max;
325
326                 max = ret->dll->funs[ret->ordinal].nrofargs;
327                 if (max>16)
328                         max=16;
329                 if (max<0)
330                         max=0;
331
332                 for (i=max;i--;)
333                         DPRINTF("%04x%s",ret->args[i],i?",":"");
334                 if (max!=ret->dll->funs[ret->ordinal].nrofargs)
335                         DPRINTF(" ...");
336                 HeapFree(GetProcessHeap(),0,ret->args);
337                 ret->args = NULL;
338         }
339         DPRINTF(") retval = %04x:%04x ret=%04x:%04x\n",
340                 (WORD)context->Edx,(WORD)context->Eax,
341                 HIWORD(ret->origreturn),LOWORD(ret->origreturn));
342         ret->origreturn = NULL; /* mark as empty */
343 }