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