if1632/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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25 #include <string.h>
  26 #include <stdio.h>
  27 #include "winbase.h"
  28 #include "windef.h"
  29 #include "winnt.h"
  30 #include "wine/winbase16.h"
  31 #include "wine/library.h"
  32 #include "global.h"
  33 #include "stackframe.h"
  34 #include "builtin16.h"
  35 #include "toolhelp.h"
  36 #include "snoop.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(NE_MODULE *pModule,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", pModule->self, 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 == pModule->self)
 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         *dll = HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, *dll, sizeof(SNOOP16_DLL)+strlen(name));
 146         (*dll)->next    = NULL;
 147         (*dll)->hmod    = pModule->self;
 148         if ((s=strrchr(name,'\\')))
 149                 name = s+1;
 150         strcpy( (*dll)->name, name );
 151         if ((s=strrchr((*dll)->name,'.')))
 152                 *s='\0';
 153         (*dll)->funhandle = GlobalHandleToSel16(GLOBAL_Alloc(GMEM_ZEROINIT,65535,0,WINE_LDT_FLAGS_CODE));
 154         (*dll)->funs = GlobalLock16((*dll)->funhandle);
 155         if (!(*dll)->funs) {
 156                 HeapFree(GetProcessHeap(),0,*dll);
 157                 FIXME("out of memory\n");
 158                 return;
 159         }
 160 }
 161
 162 FARPROC16
 163 SNOOP16_GetProcAddress16(HMODULE16 hmod,DWORD ordinal,FARPROC16 origfun) {
 164         SNOOP16_DLL                     *dll = firstdll;
 165         SNOOP16_FUN                     *fun;
 166         NE_MODULE                       *pModule = NE_GetPtr(hmod);
 167         unsigned char                   *cpnt;
 168         char                            name[200];
 169
 170         if (!TRACE_ON(snoop) || !pModule || !HIWORD(origfun))
 171                 return origfun;
 172         if (!*(LPBYTE)MapSL((SEGPTR)origfun)) /* 0x00 is an imposs. opcode, poss. dataref. */
 173                 return origfun;
 174         while (dll) {
 175                 if (hmod == dll->hmod)
 176                         break;
 177                 dll=dll->next;
 178         }
 179         if (!dll)       /* probably internal */
 180                 return origfun;
 181         if (ordinal>65535/sizeof(SNOOP16_FUN))
 182                 return origfun;
 183         fun = dll->funs+ordinal;
 184         /* already done? */
 185         fun->lcall      = 0x9a;
 186         fun->snr        = MAKELONG(0,xsnr);
 187         fun->origfun    = origfun;
 188         if (fun->name)
 189                 return (FARPROC16)(SEGPTR)MAKELONG(((char*)fun-(char*)dll->funs),dll->funhandle);
 190         cpnt = (unsigned char *)pModule + pModule->name_table;
 191         while (*cpnt) {
 192                 cpnt += *cpnt + 1 + sizeof(WORD);
 193                 if (*(WORD*)(cpnt+*cpnt+1) == ordinal) {
 194                         sprintf(name,"%.*s",*cpnt,cpnt+1);
 195                         break;
 196                 }
 197         }
 198         /* Now search the non-resident names table */
 199
 200         if (!*cpnt && pModule->nrname_handle) {
 201                 cpnt = (char *)GlobalLock16( pModule->nrname_handle );
 202                 while (*cpnt) {
 203                         cpnt += *cpnt + 1 + sizeof(WORD);
 204                         if (*(WORD*)(cpnt+*cpnt+1) == ordinal) {
 205                                     sprintf(name,"%.*s",*cpnt,cpnt+1);
 206                                     break;
 207                         }
 208                 }
 209         }
 210         if (*cpnt)
 211         {
 212             fun->name = HeapAlloc(GetProcessHeap(),0,strlen(name)+1);
 213             strcpy( fun->name, name );
 214         }
 215         else
 216             fun->name = HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,1); /* empty string */
 217
 218         if (!SNOOP_ShowDebugmsgSnoop(dll->name, ordinal, fun->name))
 219                 return origfun;
 220
 221         /* more magic. do not try to snoop thunk data entries (MMSYSTEM) */
 222         if (strchr(fun->name,'_')) {
 223                 char *s=strchr(fun->name,'_');
 224
 225                 if (!strncasecmp(s,"_thunkdata",10)) {
 226                         HeapFree(GetProcessHeap(),0,fun->name);
 227                         fun->name = NULL;
 228                         return origfun;
 229                 }
 230         }
 231         fun->lcall      = 0x9a;
 232         fun->snr        = MAKELONG(0,xsnr);
 233         fun->origfun    = origfun;
 234         fun->nrofargs   = -1;
 235         return (FARPROC16)(SEGPTR)MAKELONG(((char*)fun-(char*)dll->funs),dll->funhandle);
 236 }
 237
 238 #define CALLER1REF (*(DWORD*)(MapSL( MAKESEGPTR(context->SegSs,LOWORD(context->Esp)+4))))
 239 void WINAPI SNOOP16_Entry(FARPROC proc, LPBYTE args, CONTEXT86 *context) {
 240         DWORD           ordinal=0;
 241         DWORD           entry=(DWORD)MapSL( MAKESEGPTR(context->SegCs,LOWORD(context->Eip)) )-5;
 242         WORD            xcs = context->SegCs;
 243         SNOOP16_DLL     *dll = firstdll;
 244         SNOOP16_FUN     *fun = NULL;
 245         SNOOP16_RETURNENTRIES   **rets = &firstrets;
 246         SNOOP16_RETURNENTRY     *ret;
 247         int             i=0, max;
 248
 249         while (dll) {
 250                 if (xcs == dll->funhandle) {
 251                         fun = (SNOOP16_FUN*)entry;
 252                         ordinal = fun-dll->funs;
 253                         break;
 254                 }
 255                 dll=dll->next;
 256         }
 257         if (!dll) {
 258                 FIXME("entrypoint 0x%08lx not found\n",entry);
 259                 return; /* oops */
 260         }
 261         while (*rets) {
 262                 for (i=0;i<sizeof((*rets)->entry)/sizeof((*rets)->entry[0]);i++)
 263                         if (!(*rets)->entry[i].origreturn)
 264                                 break;
 265                 if (i!=sizeof((*rets)->entry)/sizeof((*rets)->entry[0]))
 266                         break;
 267                 rets = &((*rets)->next);
 268         }
 269         if (!*rets) {
 270                 HANDLE16 hand = GlobalHandleToSel16(GLOBAL_Alloc(GMEM_ZEROINIT,65535,0,WINE_LDT_FLAGS_CODE));
 271                 *rets = GlobalLock16(hand);
 272                 (*rets)->rethandle = hand;
 273                 i = 0;  /* entry 0 is free */
 274         }
 275         ret = &((*rets)->entry[i]);
 276         ret->lcall      = 0x9a;
 277         ret->snr        = MAKELONG(sizeof(SNOOP16_RELAY),xsnr);
 278         ret->origreturn = (FARPROC16)CALLER1REF;
 279         CALLER1REF      = MAKELONG((char*)&(ret->lcall)-(char*)((*rets)->entry),(*rets)->rethandle);
 280         ret->dll        = dll;
 281         ret->args       = NULL;
 282         ret->ordinal    = ordinal;
 283         ret->origSP     = LOWORD(context->Esp);
 284
 285         context->Eip= LOWORD(fun->origfun);
 286         context->SegCs = HIWORD(fun->origfun);
 287
 288
 289         DPRINTF("CALL %s.%ld: %s(",dll->name,ordinal,fun->name);
 290         if (fun->nrofargs>0) {
 291                 max = fun->nrofargs;
 292                 if (max>16) max=16;
 293                 for (i=max;i--;)
 294                         DPRINTF("%04x%s",*(WORD*)((char *) MapSL( MAKESEGPTR(context->SegSs,LOWORD(context->Esp)) )+8+sizeof(WORD)*i),i?",":"");
 295                 if (max!=fun->nrofargs)
 296                         DPRINTF(" ...");
 297         } else if (fun->nrofargs<0) {
 298                 DPRINTF("<unknown, check return>");
 299                 ret->args = HeapAlloc(GetProcessHeap(),0,16*sizeof(WORD));
 300                 memcpy(ret->args,(LPBYTE)((char *) MapSL( MAKESEGPTR(context->SegSs,LOWORD(context->Esp)) )+8),sizeof(WORD)*16);
 301         }
 302         DPRINTF(") ret=%04x:%04x\n",HIWORD(ret->origreturn),LOWORD(ret->origreturn));
 303 }
 304
 305 void WINAPI SNOOP16_Return(FARPROC proc, LPBYTE args, CONTEXT86 *context) {
 306         SNOOP16_RETURNENTRY     *ret = (SNOOP16_RETURNENTRY*)((char *) MapSL( MAKESEGPTR(context->SegCs,LOWORD(context->Eip)) )-5);
 307
 308         /* We haven't found out the nrofargs yet. If we called a cdecl
 309          * function it is too late anyway and we can just set '0' (which
 310          * will be the difference between orig and current SP
 311          * If pascal -> everything ok.
 312          */
 313         if (ret->dll->funs[ret->ordinal].nrofargs<0) {
 314                 ret->dll->funs[ret->ordinal].nrofargs=(LOWORD(context->Esp)-ret->origSP-4)/2;
 315         }
 316         context->Eip = LOWORD(ret->origreturn);
 317         context->SegCs  = HIWORD(ret->origreturn);
 318         if (ret->args) {
 319                 int     i,max;
 320
 321                 DPRINTF("RET  %s.%ld: %s(",ret->dll->name,ret->ordinal,ret->dll->funs[ret->ordinal].name);
 322                 max = ret->dll->funs[ret->ordinal].nrofargs;
 323                 if (max>16)
 324                         max=16;
 325                 if (max<0)
 326                         max=0;
 327
 328                 for (i=max;i--;)
 329                         DPRINTF("%04x%s",ret->args[i],i?",":"");
 330                 if (max!=ret->dll->funs[ret->ordinal].nrofargs)
 331                         DPRINTF(" ...");
 332                 DPRINTF(") retval = %04x:%04x ret=%04x:%04x\n",
 333                         (WORD)context->Edx,(WORD)context->Eax,
 334                         HIWORD(ret->origreturn),LOWORD(ret->origreturn)
 335                 );
 336                 HeapFree(GetProcessHeap(),0,ret->args);
 337                 ret->args = NULL;
 338         } else
 339                 DPRINTF("RET  %s.%ld: %s() retval = %04x:%04x ret=%04x:%04x\n",
 340                         ret->dll->name,ret->ordinal,ret->dll->funs[ret->ordinal].name,
 341                         (WORD)context->Edx,(WORD)context->Eax,
 342                         HIWORD(ret->origreturn),LOWORD(ret->origreturn)
 343                 );
 344         ret->origreturn = NULL; /* mark as empty */
 345 }
 346 #else   /* !__i386__ */
 347 void SNOOP16_RegisterDLL(NE_MODULE *pModule,LPCSTR name) {
 348         if (!TRACE_ON(snoop)) return;
 349         FIXME("snooping works only on i386 for now.\n");
 350 }
 351
 352 FARPROC16 SNOOP16_GetProcAddress16(HMODULE16 hmod,DWORD ordinal,FARPROC16 origfun) {
 353         return origfun;
 354 }
 355 #endif  /* !__i386__ */