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 "kernel_private.h"
  34 #include "module.h"
  35 #include "stackframe.h"
  36 #include "builtin16.h"
  37 #include "toolhelp.h"
  38 #include "wine/debug.h"
  39
  40 WINE_DEFAULT_DEBUG_CHANNEL(snoop);
  41
  42 #ifdef __i386__
  43
  44 #include "pshpack1.h"
  45
  46 extern int SNOOP16_ShowDebugmsgSnoop(const char *dll,int ord,const char *fname);
  47
  48 void WINAPI SNOOP16_Entry(FARPROC proc, LPBYTE args, CONTEXT86 *context);
  49 void WINAPI SNOOP16_Return(FARPROC proc, LPBYTE args, CONTEXT86 *context);
  50
  51 typedef struct tagSNOOP16_FUN {
  52         /* code part */
  53         BYTE            lcall;          /* 0x9a call absolute with segment */
  54         DWORD           snr;
  55         /* unreached */
  56         int             nrofargs;
  57         FARPROC16       origfun;
  58         char            *name;
  59 } SNOOP16_FUN;
  60
  61 typedef struct tagSNOOP16_DLL {
  62         HMODULE16       hmod;
  63         HANDLE16        funhandle;
  64         SNOOP16_FUN     *funs;
  65         struct tagSNOOP16_DLL   *next;
  66         char name[1];
  67 } SNOOP16_DLL;
  68
  69 typedef struct tagSNOOP16_RETURNENTRY {
  70         /* code part */
  71         BYTE            lcall;          /* 0x9a call absolute with segment */
  72         DWORD           snr;
  73         /* unreached */
  74         FARPROC16       origreturn;
  75         SNOOP16_DLL     *dll;
  76         DWORD           ordinal;
  77         WORD            origSP;
  78         WORD            *args;          /* saved args across a stdcall */
  79 } SNOOP16_RETURNENTRY;
  80
  81 typedef struct tagSNOOP16_RETURNENTRIES {
  82         SNOOP16_RETURNENTRY entry[65500/sizeof(SNOOP16_RETURNENTRY)];
  83         HANDLE16        rethandle;
  84         struct tagSNOOP16_RETURNENTRIES *next;
  85 } SNOOP16_RETURNENTRIES;
  86
  87 typedef struct tagSNOOP16_RELAY {
  88         WORD            pushbp;         /* 0x5566 */
  89         BYTE            pusheax;        /* 0x50 */
  90         WORD            pushax;         /* 0x5066 */
  91         BYTE            pushl;          /* 0x68 */
  92         DWORD           realfun;        /* SNOOP16_Return */
  93         BYTE            lcall;          /* 0x9a call absolute with segment */
  94         DWORD           callfromregs;
  95         WORD            seg;
  96         WORD            lret;           /* 0xcb66 */
  97 } SNOOP16_RELAY;
  98
  99 #include "poppack.h"
 100
 101 static  SNOOP16_DLL             *firstdll = NULL;
 102 static  SNOOP16_RETURNENTRIES   *firstrets = NULL;
 103 static  SNOOP16_RELAY           *snr;
 104 static  HANDLE16                xsnr = 0;
 105
 106 void
 107 SNOOP16_RegisterDLL(NE_MODULE *pModule,LPCSTR name) {
 108         SNOOP16_DLL     **dll = &(firstdll);
 109         char            *s;
 110
 111         if (!TRACE_ON(snoop)) return;
 112
 113         TRACE("hmod=%x, name=%s\n", pModule->self, name);
 114
 115         if (!snr) {
 116                 xsnr=GLOBAL_Alloc(GMEM_ZEROINIT,2*sizeof(*snr),0,WINE_LDT_FLAGS_CODE|WINE_LDT_FLAGS_32BIT);
 117                 snr = GlobalLock16(xsnr);
 118                 snr[0].pushbp   = 0x5566;
 119                 snr[0].pusheax  = 0x50;
 120                 snr[0].pushax   = 0x5066;
 121                 snr[0].pushl    = 0x68;
 122                 snr[0].realfun  = (DWORD)SNOOP16_Entry;
 123                 snr[0].lcall    = 0x9a;
 124                 snr[0].callfromregs = (DWORD)__wine_call_from_16_regs;
 125                 snr[0].seg      = wine_get_cs();
 126                 snr[0].lret     = 0xcb66;
 127
 128                 snr[1].pushbp   = 0x5566;
 129                 snr[1].pusheax  = 0x50;
 130                 snr[1].pushax   = 0x5066;
 131                 snr[1].pushl    = 0x68;
 132                 snr[1].realfun  = (DWORD)SNOOP16_Return;
 133                 snr[1].lcall    = 0x9a;
 134                 snr[1].callfromregs = (DWORD)__wine_call_from_16_regs;
 135                 snr[1].seg      = wine_get_cs();
 136                 snr[1].lret     = 0xcb66;
 137         }
 138         while (*dll) {
 139                 if ((*dll)->hmod == pModule->self)
 140                 {
 141                     /* another dll, loaded at the same address */
 142                     GlobalUnlock16((*dll)->funhandle);
 143                     GlobalFree16((*dll)->funhandle);
 144                     break;
 145                 }
 146                 dll = &((*dll)->next);
 147         }
 148
 149         if (*dll)
 150                 *dll = HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, *dll, sizeof(SNOOP16_DLL)+strlen(name));
 151         else
 152                 *dll = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(SNOOP16_DLL)+strlen(name));
 153
 154         (*dll)->next    = NULL;
 155         (*dll)->hmod    = pModule->self;
 156         if ((s=strrchr(name,'\\')))
 157                 name = s+1;
 158         strcpy( (*dll)->name, name );
 159         if ((s=strrchr((*dll)->name,'.')))
 160                 *s='\0';
 161         (*dll)->funhandle = GlobalHandleToSel16(GLOBAL_Alloc(GMEM_ZEROINIT,65535,0,WINE_LDT_FLAGS_CODE));
 162         (*dll)->funs = GlobalLock16((*dll)->funhandle);
 163         if (!(*dll)->funs) {
 164                 HeapFree(GetProcessHeap(),0,*dll);
 165                 FIXME("out of memory\n");
 166                 return;
 167         }
 168 }
 169
 170 FARPROC16
 171 SNOOP16_GetProcAddress16(HMODULE16 hmod,DWORD ordinal,FARPROC16 origfun) {
 172         SNOOP16_DLL                     *dll = firstdll;
 173         SNOOP16_FUN                     *fun;
 174         NE_MODULE                       *pModule = NE_GetPtr(hmod);
 175         unsigned char                   *cpnt;
 176         char                            name[200];
 177
 178         if (!TRACE_ON(snoop) || !pModule || !HIWORD(origfun))
 179                 return origfun;
 180         if (!*(LPBYTE)MapSL((SEGPTR)origfun)) /* 0x00 is an imposs. opcode, poss. dataref. */
 181                 return origfun;
 182         while (dll) {
 183                 if (hmod == dll->hmod)
 184                         break;
 185                 dll=dll->next;
 186         }
 187         if (!dll)       /* probably internal */
 188                 return origfun;
 189         if (ordinal>65535/sizeof(SNOOP16_FUN))
 190                 return origfun;
 191         fun = dll->funs+ordinal;
 192         /* already done? */
 193         fun->lcall      = 0x9a;
 194         fun->snr        = MAKELONG(0,xsnr);
 195         fun->origfun    = origfun;
 196         if (fun->name)
 197                 return (FARPROC16)(SEGPTR)MAKELONG(((char*)fun-(char*)dll->funs),dll->funhandle);
 198         cpnt = (unsigned char *)pModule + pModule->name_table;
 199         while (*cpnt) {
 200                 cpnt += *cpnt + 1 + sizeof(WORD);
 201                 if (*(WORD*)(cpnt+*cpnt+1) == ordinal) {
 202                         sprintf(name,"%.*s",*cpnt,cpnt+1);
 203                         break;
 204                 }
 205         }
 206         /* Now search the non-resident names table */
 207
 208         if (!*cpnt && pModule->nrname_handle) {
 209                 cpnt = (char *)GlobalLock16( pModule->nrname_handle );
 210                 while (*cpnt) {
 211                         cpnt += *cpnt + 1 + sizeof(WORD);
 212                         if (*(WORD*)(cpnt+*cpnt+1) == ordinal) {
 213                                     sprintf(name,"%.*s",*cpnt,cpnt+1);
 214                                     break;
 215                         }
 216                 }
 217         }
 218         if (*cpnt)
 219         {
 220             fun->name = HeapAlloc(GetProcessHeap(),0,strlen(name)+1);
 221             strcpy( fun->name, name );
 222         }
 223         else
 224             fun->name = HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,1); /* empty string */
 225
 226         if (!SNOOP16_ShowDebugmsgSnoop(dll->name, ordinal, fun->name))
 227                 return origfun;
 228
 229         /* more magic. do not try to snoop thunk data entries (MMSYSTEM) */
 230         if (strchr(fun->name,'_')) {
 231                 char *s=strchr(fun->name,'_');
 232
 233                 if (!strncasecmp(s,"_thunkdata",10)) {
 234                         HeapFree(GetProcessHeap(),0,fun->name);
 235                         fun->name = NULL;
 236                         return origfun;
 237                 }
 238         }
 239         fun->lcall      = 0x9a;
 240         fun->snr        = MAKELONG(0,xsnr);
 241         fun->origfun    = origfun;
 242         fun->nrofargs   = -1;
 243         return (FARPROC16)(SEGPTR)MAKELONG(((char*)fun-(char*)dll->funs),dll->funhandle);
 244 }
 245
 246 #define CALLER1REF (*(DWORD*)(MapSL( MAKESEGPTR(context->SegSs,LOWORD(context->Esp)+4))))
 247 void WINAPI SNOOP16_Entry(FARPROC proc, LPBYTE args, CONTEXT86 *context) {
 248         DWORD           ordinal=0;
 249         DWORD           entry=(DWORD)MapSL( MAKESEGPTR(context->SegCs,LOWORD(context->Eip)) )-5;
 250         WORD            xcs = context->SegCs;
 251         SNOOP16_DLL     *dll = firstdll;
 252         SNOOP16_FUN     *fun = NULL;
 253         SNOOP16_RETURNENTRIES   **rets = &firstrets;
 254         SNOOP16_RETURNENTRY     *ret;
 255         int             i=0, max;
 256
 257         while (dll) {
 258                 if (xcs == dll->funhandle) {
 259                         fun = (SNOOP16_FUN*)entry;
 260                         ordinal = fun-dll->funs;
 261                         break;
 262                 }
 263                 dll=dll->next;
 264         }
 265         if (!dll) {
 266                 FIXME("entrypoint 0x%08lx not found\n",entry);
 267                 return; /* oops */
 268         }
 269         while (*rets) {
 270                 for (i=0;i<sizeof((*rets)->entry)/sizeof((*rets)->entry[0]);i++)
 271                         if (!(*rets)->entry[i].origreturn)
 272                                 break;
 273                 if (i!=sizeof((*rets)->entry)/sizeof((*rets)->entry[0]))
 274                         break;
 275                 rets = &((*rets)->next);
 276         }
 277         if (!*rets) {
 278                 HANDLE16 hand = GlobalHandleToSel16(GLOBAL_Alloc(GMEM_ZEROINIT,65535,0,WINE_LDT_FLAGS_CODE));
 279                 *rets = GlobalLock16(hand);
 280                 (*rets)->rethandle = hand;
 281                 i = 0;  /* entry 0 is free */
 282         }
 283         ret = &((*rets)->entry[i]);
 284         ret->lcall      = 0x9a;
 285         ret->snr        = MAKELONG(sizeof(SNOOP16_RELAY),xsnr);
 286         ret->origreturn = (FARPROC16)CALLER1REF;
 287         CALLER1REF      = MAKELONG((char*)&(ret->lcall)-(char*)((*rets)->entry),(*rets)->rethandle);
 288         ret->dll        = dll;
 289         ret->args       = NULL;
 290         ret->ordinal    = ordinal;
 291         ret->origSP     = LOWORD(context->Esp);
 292
 293         context->Eip= LOWORD(fun->origfun);
 294         context->SegCs = HIWORD(fun->origfun);
 295
 296
 297         DPRINTF("%04lx:CALL %s.%ld: %s(",GetCurrentThreadId(), dll->name,ordinal,fun->name);
 298         if (fun->nrofargs>0) {
 299                 max = fun->nrofargs;
 300                 if (max>16) max=16;
 301                 for (i=max;i--;)
 302                         DPRINTF("%04x%s",*(WORD*)((char *) MapSL( MAKESEGPTR(context->SegSs,LOWORD(context->Esp)) )+8+sizeof(WORD)*i),i?",":"");
 303                 if (max!=fun->nrofargs)
 304                         DPRINTF(" ...");
 305         } else if (fun->nrofargs<0) {
 306                 DPRINTF("<unknown, check return>");
 307                 ret->args = HeapAlloc(GetProcessHeap(),0,16*sizeof(WORD));
 308                 memcpy(ret->args,(LPBYTE)((char *) MapSL( MAKESEGPTR(context->SegSs,LOWORD(context->Esp)) )+8),sizeof(WORD)*16);
 309         }
 310         DPRINTF(") ret=%04x:%04x\n",HIWORD(ret->origreturn),LOWORD(ret->origreturn));
 311 }
 312
 313 void WINAPI SNOOP16_Return(FARPROC proc, LPBYTE args, CONTEXT86 *context) {
 314         SNOOP16_RETURNENTRY     *ret = (SNOOP16_RETURNENTRY*)((char *) MapSL( MAKESEGPTR(context->SegCs,LOWORD(context->Eip)) )-5);
 315
 316         /* We haven't found out the nrofargs yet. If we called a cdecl
 317          * function it is too late anyway and we can just set '0' (which
 318          * will be the difference between orig and current SP
 319          * If pascal -> everything ok.
 320          */
 321         if (ret->dll->funs[ret->ordinal].nrofargs<0) {
 322                 ret->dll->funs[ret->ordinal].nrofargs=(LOWORD(context->Esp)-ret->origSP-4)/2;
 323         }
 324         context->Eip = LOWORD(ret->origreturn);
 325         context->SegCs  = HIWORD(ret->origreturn);
 326         DPRINTF("%04lx:RET  %s.%ld: %s(",
 327                 GetCurrentThreadId(),ret->dll->name,ret->ordinal,
 328                 ret->dll->funs[ret->ordinal].name);
 329         if (ret->args) {
 330                 int     i,max;
 331
 332                 max = ret->dll->funs[ret->ordinal].nrofargs;
 333                 if (max>16)
 334                         max=16;
 335                 if (max<0)
 336                         max=0;
 337
 338                 for (i=max;i--;)
 339                         DPRINTF("%04x%s",ret->args[i],i?",":"");
 340                 if (max!=ret->dll->funs[ret->ordinal].nrofargs)
 341                         DPRINTF(" ...");
 342                 HeapFree(GetProcessHeap(),0,ret->args);
 343                 ret->args = NULL;
 344         }
 345         DPRINTF(") retval = %04x:%04x ret=%04x:%04x\n",
 346                 (WORD)context->Edx,(WORD)context->Eax,
 347                 HIWORD(ret->origreturn),LOWORD(ret->origreturn));
 348         ret->origreturn = NULL; /* mark as empty */
 349 }
 350 #else   /* !__i386__ */
 351 void SNOOP16_RegisterDLL(NE_MODULE *pModule,LPCSTR name) {
 352         if (!TRACE_ON(snoop)) return;
 353         FIXME("snooping works only on i386 for now.\n");
 354 }
 355
 356 FARPROC16 SNOOP16_GetProcAddress16(HMODULE16 hmod,DWORD ordinal,FARPROC16 origfun) {
 357         return origfun;
 358 }
 359 #endif  /* !__i386__ */