dlls/krnl386.exe16/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., 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 "kernel16_private.h"
  35 #include "wine/debug.h"
  36
  37 WINE_DEFAULT_DEBUG_CHANNEL(snoop);
  38
  39 #include "pshpack1.h"
  40
  41 static void WINAPI SNOOP16_Entry(FARPROC proc, LPBYTE args, CONTEXT *context);
  42 static void WINAPI SNOOP16_Return(FARPROC proc, LPBYTE args, CONTEXT *context);
  43
  44 typedef struct tagSNOOP16_FUN {
  45         /* code part */
  46         BYTE            lcall;          /* 0x9a call absolute with segment */
  47         DWORD           snr;
  48         /* unreached */
  49         int             nrofargs;
  50         FARPROC16       origfun;
  51         char            *name;
  52 } SNOOP16_FUN;
  53
  54 typedef struct tagSNOOP16_DLL {
  55         HMODULE16       hmod;
  56         HANDLE16        funhandle;
  57         SNOOP16_FUN     *funs;
  58         struct tagSNOOP16_DLL   *next;
  59         char name[1];
  60 } SNOOP16_DLL;
  61
  62 typedef struct tagSNOOP16_RETURNENTRY {
  63         /* code part */
  64         BYTE            lcall;          /* 0x9a call absolute with segment */
  65         DWORD           snr;
  66         /* unreached */
  67         FARPROC16       origreturn;
  68         SNOOP16_DLL     *dll;
  69         DWORD           ordinal;
  70         WORD            origSP;
  71         WORD            *args;          /* saved args across a stdcall */
  72 } SNOOP16_RETURNENTRY;
  73
  74 typedef struct tagSNOOP16_RETURNENTRIES {
  75         SNOOP16_RETURNENTRY entry[65500/sizeof(SNOOP16_RETURNENTRY)];
  76         HANDLE16        rethandle;
  77         struct tagSNOOP16_RETURNENTRIES *next;
  78 } SNOOP16_RETURNENTRIES;
  79
  80 typedef struct tagSNOOP16_RELAY {
  81         WORD            pushbp;         /* 0x5566 */
  82         BYTE            pusheax;        /* 0x50 */
  83         WORD            pushax;         /* 0x5066 */
  84         BYTE            pushl;          /* 0x68 */
  85         DWORD           realfun;        /* SNOOP16_Return */
  86         BYTE            lcall;          /* 0x9a call absolute with segment */
  87         DWORD           callfromregs;
  88         WORD            seg;
  89         WORD            lret;           /* 0xcb66 */
  90 } SNOOP16_RELAY;
  91
  92 #include "poppack.h"
  93
  94 static  SNOOP16_DLL             *firstdll = NULL;
  95 static  SNOOP16_RETURNENTRIES   *firstrets = NULL;
  96 static  SNOOP16_RELAY           *snr;
  97 static  HANDLE16                xsnr = 0;
  98
  99 void
 100 SNOOP16_RegisterDLL(HMODULE16 hModule,LPCSTR name) {
 101         SNOOP16_DLL     **dll = &(firstdll);
 102         const char      *p;
 103         char            *q;
 104
 105         if (!TRACE_ON(snoop)) return;
 106
 107         TRACE("hmod=%x, name=%s\n", hModule, name);
 108
 109         if (!snr) {
 110                 xsnr=GLOBAL_Alloc(GMEM_ZEROINIT,2*sizeof(*snr),0,WINE_LDT_FLAGS_CODE|WINE_LDT_FLAGS_32BIT);
 111                 snr = GlobalLock16(xsnr);
 112                 snr[0].pushbp   = 0x5566;
 113                 snr[0].pusheax  = 0x50;
 114                 snr[0].pushax   = 0x5066;
 115                 snr[0].pushl    = 0x68;
 116                 snr[0].realfun  = (DWORD)SNOOP16_Entry;
 117                 snr[0].lcall    = 0x9a;
 118                 snr[0].callfromregs = (DWORD)__wine_call_from_16_regs;
 119                 snr[0].seg      = wine_get_cs();
 120                 snr[0].lret     = 0xcb66;
 121
 122                 snr[1].pushbp   = 0x5566;
 123                 snr[1].pusheax  = 0x50;
 124                 snr[1].pushax   = 0x5066;
 125                 snr[1].pushl    = 0x68;
 126                 snr[1].realfun  = (DWORD)SNOOP16_Return;
 127                 snr[1].lcall    = 0x9a;
 128                 snr[1].callfromregs = (DWORD)__wine_call_from_16_regs;
 129                 snr[1].seg      = wine_get_cs();
 130                 snr[1].lret     = 0xcb66;
 131         }
 132         while (*dll) {
 133                 if ((*dll)->hmod == hModule)
 134                 {
 135                     /* another dll, loaded at the same address */
 136                     GlobalUnlock16((*dll)->funhandle);
 137                     GlobalFree16((*dll)->funhandle);
 138                     break;
 139                 }
 140                 dll = &((*dll)->next);
 141         }
 142
 143         if (*dll)
 144                 *dll = HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, *dll, sizeof(SNOOP16_DLL)+strlen(name));
 145         else
 146                 *dll = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(SNOOP16_DLL)+strlen(name));
 147
 148         (*dll)->next    = NULL;
 149         (*dll)->hmod    = hModule;
 150         if ((p=strrchr(name,'\\')))
 151                 name = p+1;
 152         strcpy( (*dll)->name, name );
 153         if ((q=strrchr((*dll)->name,'.')))
 154                 *q='\0';
 155         (*dll)->funhandle = GlobalHandleToSel16(GLOBAL_Alloc(GMEM_ZEROINIT,65535,0,WINE_LDT_FLAGS_CODE));
 156         (*dll)->funs = GlobalLock16((*dll)->funhandle);
 157         if (!(*dll)->funs) {
 158                 HeapFree(GetProcessHeap(),0,*dll);
 159                 FIXME("out of memory\n");
 160                 return;
 161         }
 162 }
 163
 164 FARPROC16
 165 SNOOP16_GetProcAddress16(HMODULE16 hmod,DWORD ordinal,FARPROC16 origfun) {
 166         SNOOP16_DLL                     *dll = firstdll;
 167         SNOOP16_FUN                     *fun;
 168         NE_MODULE                       *pModule = NE_GetPtr(hmod);
 169         unsigned char                   *cpnt;
 170         char                            name[200];
 171
 172         if (!TRACE_ON(snoop) || !pModule || !HIWORD(origfun))
 173                 return origfun;
 174         if (!*(LPBYTE)MapSL((SEGPTR)origfun)) /* 0x00 is an impossible opcode, possible dataref. */
 175                 return origfun;
 176         while (dll) {
 177                 if (hmod == dll->hmod)
 178                         break;
 179                 dll=dll->next;
 180         }
 181         if (!dll)       /* probably internal */
 182                 return origfun;
 183         if (ordinal>65535/sizeof(SNOOP16_FUN))
 184                 return origfun;
 185         fun = dll->funs+ordinal;
 186         /* already done? */
 187         fun->lcall      = 0x9a;
 188         fun->snr        = MAKELONG(0,xsnr);
 189         fun->origfun    = origfun;
 190         if (fun->name)
 191                 return (FARPROC16)(SEGPTR)MAKELONG(((char*)fun-(char*)dll->funs),dll->funhandle);
 192         cpnt = (unsigned char *)pModule + pModule->ne_restab;
 193         while (*cpnt) {
 194                 cpnt += *cpnt + 1 + sizeof(WORD);
 195                 if (*(WORD*)(cpnt+*cpnt+1) == ordinal) {
 196                         sprintf(name,"%.*s",*cpnt,cpnt+1);
 197                         break;
 198                 }
 199         }
 200         /* Now search the non-resident names table */
 201
 202         if (!*cpnt && pModule->nrname_handle) {
 203                 cpnt = GlobalLock16( pModule->nrname_handle );
 204                 while (*cpnt) {
 205                         cpnt += *cpnt + 1 + sizeof(WORD);
 206                         if (*(WORD*)(cpnt+*cpnt+1) == ordinal) {
 207                                     sprintf(name,"%.*s",*cpnt,cpnt+1);
 208                                     break;
 209                         }
 210                 }
 211         }
 212         if (*cpnt)
 213         {
 214             fun->name = HeapAlloc(GetProcessHeap(),0,strlen(name)+1);
 215             strcpy( fun->name, name );
 216         }
 217         else
 218             fun->name = HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,1); /* empty string */
 219
 220         if (!SNOOP16_ShowDebugmsgSnoop(dll->name, ordinal, fun->name))
 221                 return origfun;
 222
 223         /* more magic. do not try to snoop thunk data entries (MMSYSTEM) */
 224         if (strchr(fun->name,'_')) {
 225                 char *s=strchr(fun->name,'_');
 226
 227                 if (!strncasecmp(s,"_thunkdata",10)) {
 228                         HeapFree(GetProcessHeap(),0,fun->name);
 229                         fun->name = NULL;
 230                         return origfun;
 231                 }
 232         }
 233         fun->lcall      = 0x9a;
 234         fun->snr        = MAKELONG(0,xsnr);
 235         fun->origfun    = origfun;
 236         fun->nrofargs   = -1;
 237         return (FARPROC16)(SEGPTR)MAKELONG(((char*)fun-(char*)dll->funs),dll->funhandle);
 238 }
 239
 240 #define CALLER1REF (*(DWORD*)(MapSL( MAKESEGPTR(context->SegSs,LOWORD(context->Esp)+4))))
 241 static void WINAPI SNOOP16_Entry(FARPROC proc, LPBYTE args, CONTEXT *context) {
 242         DWORD           ordinal=0;
 243         DWORD           entry=(DWORD)MapSL( MAKESEGPTR(context->SegCs,LOWORD(context->Eip)) )-5;
 244         WORD            xcs = context->SegCs;
 245         SNOOP16_DLL     *dll = firstdll;
 246         SNOOP16_FUN     *fun = NULL;
 247         SNOOP16_RETURNENTRIES   **rets = &firstrets;
 248         SNOOP16_RETURNENTRY     *ret;
 249         unsigned        i=0;
 250         int             max;
 251
 252         while (dll) {
 253                 if (xcs == dll->funhandle) {
 254                         fun = (SNOOP16_FUN*)entry;
 255                         ordinal = fun-dll->funs;
 256                         break;
 257                 }
 258                 dll=dll->next;
 259         }
 260         if (!dll) {
 261                 FIXME("entrypoint 0x%08x not found\n",entry);
 262                 return; /* oops */
 263         }
 264         while (*rets) {
 265                 for (i=0;i<sizeof((*rets)->entry)/sizeof((*rets)->entry[0]);i++)
 266                         if (!(*rets)->entry[i].origreturn)
 267                                 break;
 268                 if (i!=sizeof((*rets)->entry)/sizeof((*rets)->entry[0]))
 269                         break;
 270                 rets = &((*rets)->next);
 271         }
 272         if (!*rets) {
 273                 HANDLE16 hand = GlobalHandleToSel16(GLOBAL_Alloc(GMEM_ZEROINIT,65535,0,WINE_LDT_FLAGS_CODE));
 274                 *rets = GlobalLock16(hand);
 275                 (*rets)->rethandle = hand;
 276                 i = 0;  /* entry 0 is free */
 277         }
 278         ret = &((*rets)->entry[i]);
 279         ret->lcall      = 0x9a;
 280         ret->snr        = MAKELONG(sizeof(SNOOP16_RELAY),xsnr);
 281         ret->origreturn = (FARPROC16)CALLER1REF;
 282         CALLER1REF      = MAKELONG((char*)&(ret->lcall)-(char*)((*rets)->entry),(*rets)->rethandle);
 283         ret->dll        = dll;
 284         ret->args       = NULL;
 285         ret->ordinal    = ordinal;
 286         ret->origSP     = LOWORD(context->Esp);
 287
 288         context->Eip= LOWORD(fun->origfun);
 289         context->SegCs = HIWORD(fun->origfun);
 290
 291
 292         DPRINTF("%04x:CALL %s.%d: %s(",GetCurrentThreadId(), dll->name,ordinal,fun->name);
 293         if (fun->nrofargs>0) {
 294                 max = fun->nrofargs;
 295                 if (max>16) max=16;
 296                 for (i=max;i--;)
 297                         DPRINTF("%04x%s",*(WORD*)((char *) MapSL( MAKESEGPTR(context->SegSs,LOWORD(context->Esp)) )+8+sizeof(WORD)*i),i?",":"");
 298                 if (max!=fun->nrofargs)
 299                         DPRINTF(" ...");
 300         } else if (fun->nrofargs<0) {
 301                 DPRINTF("<unknown, check return>");
 302                 ret->args = HeapAlloc(GetProcessHeap(),0,16*sizeof(WORD));
 303                 memcpy(ret->args,(LPBYTE)((char *) MapSL( MAKESEGPTR(context->SegSs,LOWORD(context->Esp)) )+8),sizeof(WORD)*16);
 304         }
 305         DPRINTF(") ret=%04x:%04x\n",HIWORD(ret->origreturn),LOWORD(ret->origreturn));
 306 }
 307
 308 static void WINAPI SNOOP16_Return(FARPROC proc, LPBYTE args, CONTEXT *context) {
 309         SNOOP16_RETURNENTRY     *ret = (SNOOP16_RETURNENTRY*)((char *) MapSL( MAKESEGPTR(context->SegCs,LOWORD(context->Eip)) )-5);
 310
 311         /* We haven't found out the nrofargs yet. If we called a cdecl
 312          * function it is too late anyway and we can just set '0' (which
 313          * will be the difference between orig and current SP
 314          * If pascal -> everything ok.
 315          */
 316         if (ret->dll->funs[ret->ordinal].nrofargs<0) {
 317                 ret->dll->funs[ret->ordinal].nrofargs=(LOWORD(context->Esp)-ret->origSP-4)/2;
 318         }
 319         context->Eip = LOWORD(ret->origreturn);
 320         context->SegCs  = HIWORD(ret->origreturn);
 321         DPRINTF("%04x:RET  %s.%d: %s(",
 322                 GetCurrentThreadId(),ret->dll->name,ret->ordinal,
 323                 ret->dll->funs[ret->ordinal].name);
 324         if (ret->args) {
 325                 int     i,max;
 326
 327                 max = ret->dll->funs[ret->ordinal].nrofargs;
 328                 if (max>16)
 329                         max=16;
 330                 if (max<0)
 331                         max=0;
 332
 333                 for (i=max;i--;)
 334                         DPRINTF("%04x%s",ret->args[i],i?",":"");
 335                 if (max!=ret->dll->funs[ret->ordinal].nrofargs)
 336                         DPRINTF(" ...");
 337                 HeapFree(GetProcessHeap(),0,ret->args);
 338                 ret->args = NULL;
 339         }
 340         DPRINTF(") retval = %04x:%04x ret=%04x:%04x\n",
 341                 (WORD)context->Edx,(WORD)context->Eax,
 342                 HIWORD(ret->origreturn),LOWORD(ret->origreturn));
 343         ret->origreturn = NULL; /* mark as empty */
 344 }