git.oblomov.eu Git - wine/blob - dlls/kernel/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., 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 <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 "wine/library.h"
  33 #include "global.h"
  34 #include "stackframe.h"
  35 #include "builtin16.h"
  36 #include "toolhelp.h"
  37 #include "snoop.h"
  38 #include "wine/debug.h"
  39
  40 WINE_DEFAULT_DEBUG_CHANNEL(snoop);
  41
  42 #ifdef __i386__
  43
  44 #include "pshpack1.h"
  45
  46 void WINAPI SNOOP16_Entry(FARPROC proc, LPBYTE args, CONTEXT86 *context);
  47 void WINAPI SNOOP16_Return(FARPROC proc, LPBYTE args, CONTEXT86 *context);
  48
  49 typedef struct tagSNOOP16_FUN {
  50         /* code part */
  51         BYTE            lcall;          /* 0x9a call absolute with segment */
  52         DWORD           snr;
  53         /* unreached */
  54         int             nrofargs;
  55         FARPROC16       origfun;
  56         char            *name;
  57 } SNOOP16_FUN;
  58
  59 typedef struct tagSNOOP16_DLL {
  60         HMODULE16       hmod;
  61         HANDLE16        funhandle;
  62         SNOOP16_FUN     *funs;
  63         struct tagSNOOP16_DLL   *next;
  64         char name[1];
  65 } SNOOP16_DLL;
  66
  67 typedef struct tagSNOOP16_RETURNENTRY {
  68         /* code part */
  69         BYTE            lcall;          /* 0x9a call absolute with segment */
  70         DWORD           snr;
  71         /* unreached */
  72         FARPROC16       origreturn;
  73         SNOOP16_DLL     *dll;
  74         DWORD           ordinal;
  75         WORD            origSP;
  76         WORD            *args;          /* saved args across a stdcall */
  77 } SNOOP16_RETURNENTRY;
  78
  79 typedef struct tagSNOOP16_RETURNENTRIES {
  80         SNOOP16_RETURNENTRY entry[65500/sizeof(SNOOP16_RETURNENTRY)];
  81         HANDLE16        rethandle;
  82         struct tagSNOOP16_RETURNENTRIES *next;
  83 } SNOOP16_RETURNENTRIES;
  84
  85 typedef struct tagSNOOP16_RELAY {
  86         WORD            pushbp;         /* 0x5566 */
  87         BYTE            pusheax;        /* 0x50 */
  88         WORD            pushax;         /* 0x5066 */
  89         BYTE            pushl;          /* 0x68 */
  90         DWORD           realfun;        /* SNOOP16_Return */
  91         BYTE            lcall;          /* 0x9a call absolute with segment */
  92         DWORD           callfromregs;
  93         WORD            seg;
  94         WORD            lret;           /* 0xcb66 */
  95 } SNOOP16_RELAY;
  96
  97 #include "poppack.h"
  98
  99 static  SNOOP16_DLL             *firstdll = NULL;
 100 static  SNOOP16_RETURNENTRIES   *firstrets = NULL;
 101 static  SNOOP16_RELAY           *snr;
 102 static  HANDLE16                xsnr = 0;
 103
 104 void
 105 SNOOP16_RegisterDLL(NE_MODULE *pModule,LPCSTR name) {
 106         SNOOP16_DLL     **dll = &(firstdll);
 107         char            *s;
 108
 109         if (!TRACE_ON(snoop)) return;
 110
 111         TRACE("hmod=%x, name=%s\n", pModule->self, name);
 112
 113         if (!snr) {
 114                 xsnr=GLOBAL_Alloc(GMEM_ZEROINIT,2*sizeof(*snr),0,WINE_LDT_FLAGS_CODE|WINE_LDT_FLAGS_32BIT);
 115                 snr = GlobalLock16(xsnr);
 116                 snr[0].pushbp   = 0x5566;
 117                 snr[0].pusheax  = 0x50;
 118                 snr[0].pushax   = 0x5066;
 119                 snr[0].pushl    = 0x68;
 120                 snr[0].realfun  = (DWORD)SNOOP16_Entry;
 121                 snr[0].lcall    = 0x9a;
 122                 snr[0].callfromregs = (DWORD)__wine_call_from_16_regs;
 123                 snr[0].seg      = wine_get_cs();
 124                 snr[0].lret     = 0xcb66;
 125
 126                 snr[1].pushbp   = 0x5566;
 127                 snr[1].pusheax  = 0x50;
 128                 snr[1].pushax   = 0x5066;
 129                 snr[1].pushl    = 0x68;
 130                 snr[1].realfun  = (DWORD)SNOOP16_Return;
 131                 snr[1].lcall    = 0x9a;
 132                 snr[1].callfromregs = (DWORD)__wine_call_from_16_regs;
 133                 snr[1].seg      = wine_get_cs();
 134                 snr[1].lret     = 0xcb66;
 135         }
 136         while (*dll) {
 137                 if ((*dll)->hmod == pModule->self)
 138                 {
 139                     /* another dll, loaded at the same address */
 140                     GlobalUnlock16((*dll)->funhandle);
 141                     GlobalFree16((*dll)->funhandle);
 142                     break;
 143                 }
 144                 dll = &((*dll)->next);
 145         }
 146         *dll = HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, *dll, sizeof(SNOOP16_DLL)+strlen(name));
 147         (*dll)->next    = NULL;
 148         (*dll)->hmod    = pModule->self;
 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 imposs. opcode, poss. 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->name_table;
 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 = (char *)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 (!SNOOP_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 void WINAPI SNOOP16_Entry(FARPROC proc, LPBYTE args, CONTEXT86 *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         int             i=0, max;
 249
 250         while (dll) {
 251                 if (xcs == dll->funhandle) {
 252                         fun = (SNOOP16_FUN*)entry;
 253                         ordinal = fun-dll->funs;
 254                         break;
 255                 }
 256                 dll=dll->next;
 257         }
 258         if (!dll) {
 259                 FIXME("entrypoint 0x%08lx not found\n",entry);
 260                 return; /* oops */
 261         }
 262         while (*rets) {
 263                 for (i=0;i<sizeof((*rets)->entry)/sizeof((*rets)->entry[0]);i++)
 264                         if (!(*rets)->entry[i].origreturn)
 265                                 break;
 266                 if (i!=sizeof((*rets)->entry)/sizeof((*rets)->entry[0]))
 267                         break;
 268                 rets = &((*rets)->next);
 269         }
 270         if (!*rets) {
 271                 HANDLE16 hand = GlobalHandleToSel16(GLOBAL_Alloc(GMEM_ZEROINIT,65535,0,WINE_LDT_FLAGS_CODE));
 272                 *rets = GlobalLock16(hand);
 273                 (*rets)->rethandle = hand;
 274                 i = 0;  /* entry 0 is free */
 275         }
 276         ret = &((*rets)->entry[i]);
 277         ret->lcall      = 0x9a;
 278         ret->snr        = MAKELONG(sizeof(SNOOP16_RELAY),xsnr);
 279         ret->origreturn = (FARPROC16)CALLER1REF;
 280         CALLER1REF      = MAKELONG((char*)&(ret->lcall)-(char*)((*rets)->entry),(*rets)->rethandle);
 281         ret->dll        = dll;
 282         ret->args       = NULL;
 283         ret->ordinal    = ordinal;
 284         ret->origSP     = LOWORD(context->Esp);
 285
 286         context->Eip= LOWORD(fun->origfun);
 287         context->SegCs = HIWORD(fun->origfun);
 288
 289
 290         DPRINTF("CALL %s.%ld: %s(",dll->name,ordinal,fun->name);
 291         if (fun->nrofargs>0) {
 292                 max = fun->nrofargs;
 293                 if (max>16) max=16;
 294                 for (i=max;i--;)
 295                         DPRINTF("%04x%s",*(WORD*)((char *) MapSL( MAKESEGPTR(context->SegSs,LOWORD(context->Esp)) )+8+sizeof(WORD)*i),i?",":"");
 296                 if (max!=fun->nrofargs)
 297                         DPRINTF(" ...");
 298         } else if (fun->nrofargs<0) {
 299                 DPRINTF("<unknown, check return>");
 300                 ret->args = HeapAlloc(GetProcessHeap(),0,16*sizeof(WORD));
 301                 memcpy(ret->args,(LPBYTE)((char *) MapSL( MAKESEGPTR(context->SegSs,LOWORD(context->Esp)) )+8),sizeof(WORD)*16);
 302         }
 303         DPRINTF(") ret=%04x:%04x\n",HIWORD(ret->origreturn),LOWORD(ret->origreturn));
 304 }
 305
 306 void WINAPI SNOOP16_Return(FARPROC proc, LPBYTE args, CONTEXT86 *context) {
 307         SNOOP16_RETURNENTRY     *ret = (SNOOP16_RETURNENTRY*)((char *) MapSL( MAKESEGPTR(context->SegCs,LOWORD(context->Eip)) )-5);
 308
 309         /* We haven't found out the nrofargs yet. If we called a cdecl
 310          * function it is too late anyway and we can just set '0' (which
 311          * will be the difference between orig and current SP
 312          * If pascal -> everything ok.
 313          */
 314         if (ret->dll->funs[ret->ordinal].nrofargs<0) {
 315                 ret->dll->funs[ret->ordinal].nrofargs=(LOWORD(context->Esp)-ret->origSP-4)/2;
 316         }
 317         context->Eip = LOWORD(ret->origreturn);
 318         context->SegCs  = HIWORD(ret->origreturn);
 319         if (ret->args) {
 320                 int     i,max;
 321
 322                 DPRINTF("RET  %s.%ld: %s(",ret->dll->name,ret->ordinal,ret->dll->funs[ret->ordinal].name);
 323                 max = ret->dll->funs[ret->ordinal].nrofargs;
 324                 if (max>16)
 325                         max=16;
 326                 if (max<0)
 327                         max=0;
 328
 329                 for (i=max;i--;)
 330                         DPRINTF("%04x%s",ret->args[i],i?",":"");
 331                 if (max!=ret->dll->funs[ret->ordinal].nrofargs)
 332                         DPRINTF(" ...");
 333                 DPRINTF(") retval = %04x:%04x ret=%04x:%04x\n",
 334                         (WORD)context->Edx,(WORD)context->Eax,
 335                         HIWORD(ret->origreturn),LOWORD(ret->origreturn)
 336                 );
 337                 HeapFree(GetProcessHeap(),0,ret->args);
 338                 ret->args = NULL;
 339         } else
 340                 DPRINTF("RET  %s.%ld: %s() retval = %04x:%04x ret=%04x:%04x\n",
 341                         ret->dll->name,ret->ordinal,ret->dll->funs[ret->ordinal].name,
 342                         (WORD)context->Edx,(WORD)context->Eax,
 343                         HIWORD(ret->origreturn),LOWORD(ret->origreturn)
 344                 );
 345         ret->origreturn = NULL; /* mark as empty */
 346 }
 347 #else   /* !__i386__ */
 348 void SNOOP16_RegisterDLL(NE_MODULE *pModule,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__ */