git.oblomov.eu Git - wine/blob - dlls/kernel32/snoop16.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 "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__ */