relay32/relay386.c

   1 /*
   2  * 386-specific Win32 relay functions
   3  *
   4  * Copyright 1997 Alexandre Julliard
   5  */
   6
   7 #ifdef __i386__
   8
   9 #include <assert.h>
  10 #include <string.h>
  11 #include "winnt.h"
  12 #include "windows.h"
  13 #include "builtin32.h"
  14 #include "selectors.h"
  15 #include "debugstr.h"
  16 #include "debug.h"
  17
  18 char **debug_relay_excludelist = NULL, **debug_relay_includelist = NULL;
  19
  20 /***********************************************************************
  21  *           RELAY_ShowDebugmsgRelay
  22  *
  23  * Simple function to decide if a particular debugging message is
  24  * wanted.  Called from RELAY_CallFrom32 and from in if1632/relay.c
  25  */
  26 int RELAY_ShowDebugmsgRelay(const char *func) {
  27
  28   if(debug_relay_excludelist || debug_relay_includelist) {
  29     const char *term = strchr(func, ':');
  30     char **listitem;
  31     int len, len2, itemlen, show;
  32
  33     if(debug_relay_excludelist) {
  34       show = 1;
  35       listitem = debug_relay_excludelist;
  36     } else {
  37       show = 0;
  38       listitem = debug_relay_includelist;
  39     }
  40     assert(term);
  41     assert(strlen(term) > 2);
  42     len = term - func;
  43     len2 = strchr(func, '.') - func;
  44     assert(len2 && len2 > 0 && len2 < 64);
  45     term += 2;
  46     for(; *listitem; listitem++) {
  47       itemlen = strlen(*listitem);
  48       if((itemlen == len && !strncmp(*listitem, func, len)) ||
  49          (itemlen == len2 && !strncmp(*listitem, func, len2)) ||
  50          !strcmp(*listitem, term)) {
  51         show = !show;
  52        break;
  53       }
  54     }
  55     return show;
  56   }
  57   return 1;
  58 }
  59
  60 /***********************************************************************
  61  *           RELAY_CallFrom32
  62  *
  63  * Stack layout on entry to this function:
  64  *  ...      ...
  65  * (esp+12)  arg2
  66  * (esp+8)   arg1
  67  * (esp+4)   ret_addr
  68  * (esp)     return addr to relay code
  69  */
  70 int RELAY_CallFrom32( int ret_addr, ... )
  71 {
  72     int i, ret, show;
  73     char buffer[80];
  74     FARPROC32 func;
  75     unsigned int mask, typemask;
  76     WORD fs;
  77     DWORD deadbeef = 0xdeadbeef,*xdeadbeef = &deadbeef;
  78
  79     int *args = &ret_addr;
  80     /* Relay addr is the return address for this function */
  81     BYTE *relay_addr = (BYTE *)args[-1];
  82     WORD nb_args = *(WORD *)(relay_addr + 1) / sizeof(int);
  83
  84     assert(TRACE_ON(relay));
  85     func = (FARPROC32)BUILTIN32_GetEntryPoint( buffer, relay_addr - 5,
  86                                                &typemask );
  87       DPRINTF( "Call %s(", buffer );
  88       args++;
  89       for (i = 0, mask = 3; i < nb_args; i++, mask <<= 2)
  90       {
  91         if (i) DPRINTF( "," );
  92         if ((typemask & mask) && HIWORD(args[i]))
  93         {
  94             if (typemask & (2<<(2*i)))
  95                 DPRINTF( "%08x L%s", args[i], debugstr_w((LPWSTR)args[i]) );
  96             else
  97                 DPRINTF( "%08x %s", args[i], debugstr_a((LPCSTR)args[i]) );
  98         }
  99         else DPRINTF( "%08x", args[i] );
 100       }
 101       GET_FS( fs );
 102       DPRINTF( ") ret=%08x fs=%04x\n", ret_addr, fs );
 103
 104     if (*relay_addr == 0xc3) /* cdecl */
 105     {
 106         LRESULT (*cfunc)() = (LRESULT(*)())func;
 107         switch(nb_args)
 108         {
 109         case 0: ret = cfunc(); break;
 110         case 1: ret = cfunc(args[0]); break;
 111         case 2: ret = cfunc(args[0],args[1]); break;
 112         case 3: ret = cfunc(args[0],args[1],args[2]); break;
 113         case 4: ret = cfunc(args[0],args[1],args[2],args[3]); break;
 114         case 5: ret = cfunc(args[0],args[1],args[2],args[3],args[4]); break;
 115         case 6: ret = cfunc(args[0],args[1],args[2],args[3],args[4],
 116                             args[5]); break;
 117         case 7: ret = cfunc(args[0],args[1],args[2],args[3],args[4],args[5],
 118                             args[6]); break;
 119         case 8: ret = cfunc(args[0],args[1],args[2],args[3],args[4],args[5],
 120                             args[6],args[7]); break;
 121         case 9: ret = cfunc(args[0],args[1],args[2],args[3],args[4],args[5],
 122                             args[6],args[7],args[8]); break;
 123         case 10: ret = cfunc(args[0],args[1],args[2],args[3],args[4],args[5],
 124                              args[6],args[7],args[8],args[9]); break;
 125         case 11: ret = cfunc(args[0],args[1],args[2],args[3],args[4],args[5],
 126                              args[6],args[7],args[8],args[9],args[10]); break;
 127         case 12: ret = cfunc(args[0],args[1],args[2],args[3],args[4],args[5],
 128                              args[6],args[7],args[8],args[9],args[10],
 129                              args[11]); break;
 130         case 13: ret = cfunc(args[0],args[1],args[2],args[3],args[4],args[5],
 131                              args[6],args[7],args[8],args[9],args[10],args[11],
 132                              args[12]); break;
 133         case 14: ret = cfunc(args[0],args[1],args[2],args[3],args[4],args[5],
 134                              args[6],args[7],args[8],args[9],args[10],args[11],
 135                              args[12],args[13]); break;
 136         case 15: ret = cfunc(args[0],args[1],args[2],args[3],args[4],args[5],
 137                              args[6],args[7],args[8],args[9],args[10],args[11],
 138                              args[12],args[13],args[14]); break;
 139         default:
 140             ERR(relay, "Unsupported nb args %d\n",
 141                      nb_args );
 142             assert(FALSE);
 143         }
 144     }
 145     else  /* stdcall */
 146     {
 147         switch(nb_args)
 148         {
 149         case 0: ret = func(); break;
 150         case 1: ret = func(args[0]); break;
 151         case 2: ret = func(args[0],args[1]); break;
 152         case 3: ret = func(args[0],args[1],args[2]); break;
 153         case 4: ret = func(args[0],args[1],args[2],args[3]); break;
 154         case 5: ret = func(args[0],args[1],args[2],args[3],args[4]); break;
 155         case 6: ret = func(args[0],args[1],args[2],args[3],args[4],
 156                            args[5]); break;
 157         case 7: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 158                            args[6]); break;
 159         case 8: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 160                            args[6],args[7]); break;
 161         case 9: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 162                            args[6],args[7],args[8]); break;
 163         case 10: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 164                             args[6],args[7],args[8],args[9]); break;
 165         case 11: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 166                             args[6],args[7],args[8],args[9],args[10]); break;
 167         case 12: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 168                             args[6],args[7],args[8],args[9],args[10],
 169                             args[11]); break;
 170         case 13: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 171                             args[6],args[7],args[8],args[9],args[10],args[11],
 172                             args[12]); break;
 173         case 14: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 174                             args[6],args[7],args[8],args[9],args[10],args[11],
 175                             args[12],args[13]); break;
 176         case 15: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 177                             args[6],args[7],args[8],args[9],args[10],args[11],
 178                             args[12],args[13],args[14]); break;
 179         default:
 180             ERR(relay, "Unsupported nb args %d\n",nb_args );
 181             assert(FALSE);
 182         }
 183     }
 184     if(show)
 185       DPRINTF( "Ret  %s() retval=%08x ret=%08x fs=%04x\n",
 186                buffer, ret, ret_addr, fs );
 187     assert(*xdeadbeef==0xdeadbeef);
 188     return ret;
 189 }
 190
 191
 192 /***********************************************************************
 193  *           RELAY_CallFrom32Regs
 194  *
 195  * 'context' contains the register contents at the point of call of
 196  * the REG_ENTRY_POINT. The stack layout of the stack pointed to by
 197  * ESP_reg(&context) is as follows:
 198  *
 199  * If debugmsg(relay) is OFF:
 200  *  ...    ...
 201  * (esp+4) args
 202  * (esp)   return addr to caller
 203  * (esp-4) function entry point
 204  *
 205  * If debugmsg(relay) is ON:
 206  *  ...    ...
 207  * (esp+8) args
 208  * (esp+4) return addr to caller
 209  * (esp)   return addr to DEBUG_ENTRY_POINT
 210  * (esp-4) function entry point
 211  *
 212  * As the called function might change the stack layout
 213  * (e.g. FT_Prolog, FT_ExitNN), we remove all modifications to the stack,
 214  * so that the called function sees (in both cases):
 215  *
 216  *  ...    ...
 217  * (esp+4) args
 218  * (esp)   return addr to caller
 219  *  ...    >128 bytes space free to be modified (ensured by the assembly glue)
 220  *
 221  * NOTE: This routine makes no assumption about the relative position of
 222  *       its own stack to the stack pointed to by ESP_reg(&context),
 223  *       except that the latter must have >128 bytes space to grow.
 224  *       This means the assembly glue could even switch stacks completely
 225  *       (e.g. to allow for large stacks).
 226  *
 227  */
 228
 229 void RELAY_CallFrom32Regs( CONTEXT context )
 230 {
 231     typedef void (CALLBACK *entry_point_t)(CONTEXT *);
 232     entry_point_t entry_point = *(entry_point_t*) (ESP_reg(&context) - 4);
 233
 234     __RESTORE_ES;
 235
 236     if (!TRACE_ON(relay))
 237     {
 238         /* Simply call the entry point */
 239         entry_point( &context );
 240     }
 241     else
 242     {
 243         char buffer[80];
 244         unsigned int typemask;
 245         BYTE *relay_addr;
 246
 247         /*
 248          * Fixup the context structure because of the extra parameter
 249          * pushed by the relay debugging code.
 250          * Note that this implicitly does a RET on the CALL from the
 251          * DEBUG_ENTRY_POINT to the REG_ENTRY_POINT;  setting the EIP register
 252          * ensures that the assembly glue will directly return to the
 253          * caller, just as in the non-debugging case.
 254          */
 255
 256         relay_addr = *(BYTE **) ESP_reg(&context);
 257         if (BUILTIN32_GetEntryPoint( buffer, relay_addr - 5, &typemask )) {
 258             /* correct win32 spec generated register function found.
 259              * remove extra call stuff from stack
 260              */
 261             ESP_reg(&context) += sizeof(BYTE *);
 262             EIP_reg(&context) = *(DWORD *)ESP_reg(&context);
 263             DPRINTF("Call %s(regs) ret=%08x\n", buffer, *(int *)ESP_reg(&context) );
 264             DPRINTF(" EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx ESI=%08lx EDI=%08lx\n",
 265                     EAX_reg(&context), EBX_reg(&context), ECX_reg(&context),
 266                     EDX_reg(&context), ESI_reg(&context), EDI_reg(&context) );
 267             DPRINTF(" EBP=%08lx ESP=%08lx EIP=%08lx DS=%04lx ES=%04lx FS=%04lx GS=%04lx EFL=%08lx\n",
 268                     EBP_reg(&context), ESP_reg(&context), EIP_reg(&context),
 269                     DS_reg(&context), ES_reg(&context), FS_reg(&context),
 270                     GS_reg(&context), EFL_reg(&context) );
 271
 272             /* Now call the real function */
 273             entry_point( &context );
 274
 275
 276             DPRINTF("Ret  %s() retval=regs ret=%08x\n", buffer, *(int *)ESP_reg(&context) );
 277             DPRINTF(" EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx ESI=%08lx EDI=%08lx\n",
 278                     EAX_reg(&context), EBX_reg(&context), ECX_reg(&context),
 279                     EDX_reg(&context), ESI_reg(&context), EDI_reg(&context) );
 280             DPRINTF(" EBP=%08lx ESP=%08lx EIP=%08lx DS=%04lx ES=%04lx FS=%04lx GS=%04lx EFL=%08lx\n",
 281                     EBP_reg(&context), ESP_reg(&context), EIP_reg(&context),
 282                     DS_reg(&context), ES_reg(&context), FS_reg(&context),
 283                     GS_reg(&context), EFL_reg(&context) );
 284         } else
 285             /* WINE internal register function found. Do not remove anything.
 286              * Do not print any debuginfo (it is not a normal relayed one).
 287              * Currently only used for snooping.
 288              */
 289            entry_point( &context );
 290     }
 291 }
 292 #endif  /* __i386__ */