tools/winebuild/relay.c

   1 /*
   2  * Relay calls helper routines
   3  *
   4  * Copyright 1993 Robert J. Amstadt
   5  * Copyright 1995 Martin von Loewis
   6  * Copyright 1995, 1996, 1997 Alexandre Julliard
   7  * Copyright 1997 Eric Youngdale
   8  * Copyright 1999 Ulrich Weigand
   9  *
  10  * This library is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2.1 of the License, or (at your option) any later version.
  14  *
  15  * This library is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public
  21  * License along with this library; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  23  */
  24
  25 #include "config.h"
  26 #include "wine/port.h"
  27
  28 #include <ctype.h>
  29
  30 #include "thread.h"
  31 #include "wine/winbase16.h"
  32
  33 #include "build.h"
  34
  35 /* offset of a structure field relative to the start of the struct */
  36 #define STRUCTOFFSET(type,field) ((int)FIELD_OFFSET(type,field))
  37
  38 /* offset of register relative to the start of the CONTEXT struct */
  39 #define CONTEXTOFFSET(reg)  STRUCTOFFSET(CONTEXT86,reg)
  40
  41 /* offset of register relative to the start of the STACK16FRAME struct */
  42 #define STACK16OFFSET(reg)  STRUCTOFFSET(STACK16FRAME,reg)
  43
  44 /* offset of register relative to the start of the STACK32FRAME struct */
  45 #define STACK32OFFSET(reg)  STRUCTOFFSET(STACK32FRAME,reg)
  46
  47 /* offset of the stack pointer relative to %fs:(0) */
  48 #define STACKOFFSET 0xc0  /* STRUCTOFFSET(TEB,WOW32Reserved) */
  49
  50 /* fix this if the ntdll_thread_regs structure is changed */
  51 #define GS_OFFSET  0x1d8  /* STRUCTOFFSET(TEB,SystemReserved2) + STRUCTOFFSET(ntdll_thread_data,gs) */
  52
  53 static void function_header( const char *name )
  54 {
  55     output( "\n\t.align %d\n", get_alignment(4) );
  56     output( "\t%s\n", func_declaration(name) );
  57     output( "%s\n", asm_globl(name) );
  58 }
  59
  60
  61 /*******************************************************************
  62  *         BuildCallFrom16Core
  63  *
  64  * This routine builds the core routines used in 16->32 thunks:
  65  * CallFrom16Word, CallFrom16Long, CallFrom16Register, and CallFrom16Thunk.
  66  *
  67  * These routines are intended to be called via a far call (with 32-bit
  68  * operand size) from 16-bit code.  The 16-bit code stub must push %bp,
  69  * the 32-bit entry point to be called, and the argument conversion
  70  * routine to be used (see stack layout below).
  71  *
  72  * The core routine completes the STACK16FRAME on the 16-bit stack and
  73  * switches to the 32-bit stack.  Then, the argument conversion routine
  74  * is called; it gets passed the 32-bit entry point and a pointer to the
  75  * 16-bit arguments (on the 16-bit stack) as parameters. (You can either
  76  * use conversion routines automatically generated by BuildCallFrom16,
  77  * or write your own for special purposes.)
  78  *
  79  * The conversion routine must call the 32-bit entry point, passing it
  80  * the converted arguments, and return its return value to the core.
  81  * After the conversion routine has returned, the core switches back
  82  * to the 16-bit stack, converts the return value to the DX:AX format
  83  * (CallFrom16Long), and returns to the 16-bit call stub.  All parameters,
  84  * including %bp, are popped off the stack.
  85  *
  86  * The 16-bit call stub now returns to the caller, popping the 16-bit
  87  * arguments if necessary (pascal calling convention).
  88  *
  89  * In the case of a 'register' function, CallFrom16Register fills a
  90  * CONTEXT86 structure with the values all registers had at the point
  91  * the first instruction of the 16-bit call stub was about to be
  92  * executed.  A pointer to this CONTEXT86 is passed as third parameter
  93  * to the argument conversion routine, which typically passes it on
  94  * to the called 32-bit entry point.
  95  *
  96  * CallFrom16Thunk is a special variant used by the implementation of
  97  * the Win95 16->32 thunk functions C16ThkSL and C16ThkSL01 and is
  98  * implemented as follows:
  99  * On entry, the EBX register is set up to contain a flat pointer to the
 100  * 16-bit stack such that EBX+22 points to the first argument.
 101  * Then, the entry point is called, while EBP is set up to point
 102  * to the return address (on the 32-bit stack).
 103  * The called function returns with CX set to the number of bytes
 104  * to be popped of the caller's stack.
 105  *
 106  * Stack layout upon entry to the core routine (STACK16FRAME):
 107  *  ...           ...
 108  * (sp+24) word   first 16-bit arg
 109  * (sp+22) word   cs
 110  * (sp+20) word   ip
 111  * (sp+18) word   bp
 112  * (sp+14) long   32-bit entry point (reused for Win16 mutex recursion count)
 113  * (sp+12) word   ip of actual entry point (necessary for relay debugging)
 114  * (sp+8)  long   relay (argument conversion) function entry point
 115  * (sp+4)  long   cs of 16-bit entry point
 116  * (sp)    long   ip of 16-bit entry point
 117  *
 118  * Added on the stack:
 119  * (sp-2)  word   saved gs
 120  * (sp-4)  word   saved fs
 121  * (sp-6)  word   saved es
 122  * (sp-8)  word   saved ds
 123  * (sp-12) long   saved ebp
 124  * (sp-16) long   saved ecx
 125  * (sp-20) long   saved edx
 126  * (sp-24) long   saved previous stack
 127  */
 128 static void BuildCallFrom16Core( int reg_func, int thunk )
 129 {
 130     /* Function header */
 131     if (thunk) function_header( "__wine_call_from_16_thunk" );
 132     else if (reg_func) function_header( "__wine_call_from_16_regs" );
 133     else function_header( "__wine_call_from_16" );
 134
 135     /* Create STACK16FRAME (except STACK32FRAME link) */
 136     output( "\tpushw %%gs\n" );
 137     output( "\tpushw %%fs\n" );
 138     output( "\tpushw %%es\n" );
 139     output( "\tpushw %%ds\n" );
 140     output( "\tpushl %%ebp\n" );
 141     output( "\tpushl %%ecx\n" );
 142     output( "\tpushl %%edx\n" );
 143
 144     /* Save original EFlags register */
 145     if (reg_func) output( "\tpushfl\n" );
 146
 147     if ( UsePIC )
 148     {
 149         output( "\tcall 1f\n" );
 150         output( "1:\tpopl %%ecx\n" );
 151         output( "\t.byte 0x2e\n\tmovl %s-1b(%%ecx),%%edx\n", asm_name("CallTo16_DataSelector") );
 152     }
 153     else
 154         output( "\t.byte 0x2e\n\tmovl %s,%%edx\n", asm_name("CallTo16_DataSelector") );
 155
 156     /* Load 32-bit segment registers */
 157     output( "\tmovw %%dx, %%ds\n" );
 158     output( "\tmovw %%dx, %%es\n" );
 159
 160     if ( UsePIC )
 161         output( "\tmovw %s-1b(%%ecx), %%fs\n", asm_name("CallTo16_TebSelector") );
 162     else
 163         output( "\tmovw %s, %%fs\n", asm_name("CallTo16_TebSelector") );
 164
 165     output( "\t.byte 0x64\n\tmov (%d),%%gs\n", GS_OFFSET );
 166
 167     /* Translate STACK16FRAME base to flat offset in %edx */
 168     output( "\tmovw %%ss, %%dx\n" );
 169     output( "\tandl $0xfff8, %%edx\n" );
 170     output( "\tshrl $1, %%edx\n" );
 171     if (UsePIC)
 172     {
 173         output( "\taddl wine_ldt_copy_ptr-1b(%%ecx),%%edx\n" );
 174         output( "\tmovl (%%edx), %%edx\n" );
 175     }
 176     else
 177         output( "\tmovl %s(%%edx), %%edx\n", asm_name("wine_ldt_copy") );
 178     output( "\tmovzwl %%sp, %%ebp\n" );
 179     output( "\tleal %d(%%ebp,%%edx), %%edx\n", reg_func ? 0 : -4 );
 180
 181     /* Get saved flags into %ecx */
 182     if (reg_func) output( "\tpopl %%ecx\n" );
 183
 184     /* Get the 32-bit stack pointer from the TEB and complete STACK16FRAME */
 185     output( "\t.byte 0x64\n\tmovl (%d), %%ebp\n", STACKOFFSET );
 186     output( "\tpushl %%ebp\n" );
 187
 188     /* Switch stacks */
 189     output( "\t.byte 0x64\n\tmovw %%ss, (%d)\n", STACKOFFSET + 2 );
 190     output( "\t.byte 0x64\n\tmovw %%sp, (%d)\n", STACKOFFSET );
 191     output( "\tpushl %%ds\n" );
 192     output( "\tpopl %%ss\n" );
 193     output( "\tmovl %%ebp, %%esp\n" );
 194     output( "\taddl $%d, %%ebp\n", STACK32OFFSET(ebp) );
 195
 196
 197     /* At this point:
 198        STACK16FRAME is completely set up
 199        DS, ES, SS: flat data segment
 200        FS: current TEB
 201        ESP: points to last STACK32FRAME
 202        EBP: points to ebp member of last STACK32FRAME
 203        EDX: points to current STACK16FRAME
 204        ECX: contains saved flags
 205        all other registers: unchanged */
 206
 207     /* Special case: C16ThkSL stub */
 208     if ( thunk )
 209     {
 210         /* Set up registers as expected and call thunk */
 211         output( "\tleal %d(%%edx), %%ebx\n", (int)sizeof(STACK16FRAME)-22 );
 212         output( "\tleal -4(%%esp), %%ebp\n" );
 213
 214         output( "\tcall *%d(%%edx)\n", STACK16OFFSET(entry_point) );
 215
 216         /* Switch stack back */
 217         output( "\t.byte 0x64\n\tmovw (%d), %%ss\n", STACKOFFSET+2 );
 218         output( "\t.byte 0x64\n\tmovzwl (%d), %%esp\n", STACKOFFSET );
 219         output( "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
 220
 221         /* Restore registers and return directly to caller */
 222         output( "\taddl $8, %%esp\n" );
 223         output( "\tpopl %%ebp\n" );
 224         output( "\tpopw %%ds\n" );
 225         output( "\tpopw %%es\n" );
 226         output( "\tpopw %%fs\n" );
 227         output( "\tpopw %%gs\n" );
 228         output( "\taddl $20, %%esp\n" );
 229
 230         output( "\txorb %%ch, %%ch\n" );
 231         output( "\tpopl %%ebx\n" );
 232         output( "\taddw %%cx, %%sp\n" );
 233         output( "\tpush %%ebx\n" );
 234
 235         output( "\t.byte 0x66\n" );
 236         output( "\tlret\n" );
 237
 238         return;
 239     }
 240
 241
 242     /* Build register CONTEXT */
 243     if ( reg_func )
 244     {
 245         output( "\tsubl $%d, %%esp\n", (int)sizeof(CONTEXT86) );
 246
 247         output( "\tmovl %%ecx, %d(%%esp)\n", CONTEXTOFFSET(EFlags) );
 248
 249         output( "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Eax) );
 250         output( "\tmovl %%ebx, %d(%%esp)\n", CONTEXTOFFSET(Ebx) );
 251         output( "\tmovl %%esi, %d(%%esp)\n", CONTEXTOFFSET(Esi) );
 252         output( "\tmovl %%edi, %d(%%esp)\n", CONTEXTOFFSET(Edi) );
 253
 254         output( "\tmovl %d(%%edx), %%eax\n", STACK16OFFSET(ebp) );
 255         output( "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Ebp) );
 256         output( "\tmovl %d(%%edx), %%eax\n", STACK16OFFSET(ecx) );
 257         output( "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Ecx) );
 258         output( "\tmovl %d(%%edx), %%eax\n", STACK16OFFSET(edx) );
 259         output( "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Edx) );
 260
 261         output( "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(ds) );
 262         output( "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegDs) );
 263         output( "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(es) );
 264         output( "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegEs) );
 265         output( "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(fs) );
 266         output( "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegFs) );
 267         output( "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(gs) );
 268         output( "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegGs) );
 269
 270         output( "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(cs) );
 271         output( "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegCs) );
 272         output( "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(ip) );
 273         output( "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Eip) );
 274
 275         output( "\t.byte 0x64\n\tmovzwl (%d), %%eax\n", STACKOFFSET+2 );
 276         output( "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegSs) );
 277         output( "\t.byte 0x64\n\tmovzwl (%d), %%eax\n", STACKOFFSET );
 278         output( "\taddl $%d, %%eax\n", STACK16OFFSET(ip) );
 279         output( "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Esp) );
 280 #if 0
 281         output( "\tfsave %d(%%esp)\n", CONTEXTOFFSET(FloatSave) );
 282 #endif
 283
 284         /* Push address of CONTEXT86 structure -- popped by the relay routine */
 285         output( "\tmovl %%esp,%%eax\n" );
 286         output( "\tandl $~15,%%esp\n" );
 287         output( "\tsubl $4,%%esp\n" );
 288         output( "\tpushl %%eax\n" );
 289     }
 290     else
 291     {
 292         output( "\tsubl $8,%%esp\n" );
 293         output( "\tandl $~15,%%esp\n" );
 294         output( "\taddl $8,%%esp\n" );
 295     }
 296
 297     /* Call relay routine (which will call the API entry point) */
 298     output( "\tleal %d(%%edx), %%eax\n", (int)sizeof(STACK16FRAME) );
 299     output( "\tpushl %%eax\n" );
 300     output( "\tpushl %d(%%edx)\n", STACK16OFFSET(entry_point) );
 301     output( "\tcall *%d(%%edx)\n", STACK16OFFSET(relay) );
 302
 303     if ( reg_func )
 304     {
 305         output( "\tleal -%d(%%ebp), %%ebx\n", (int)sizeof(CONTEXT) + STACK32OFFSET(ebp) );
 306
 307         /* Switch stack back */
 308         output( "\t.byte 0x64\n\tmovw (%d), %%ss\n", STACKOFFSET+2 );
 309         output( "\t.byte 0x64\n\tmovzwl (%d), %%esp\n", STACKOFFSET );
 310         output( "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
 311
 312         /* Get return address to CallFrom16 stub */
 313         output( "\taddw $%d, %%sp\n", STACK16OFFSET(callfrom_ip)-4 );
 314         output( "\tpopl %%eax\n" );
 315         output( "\tpopl %%edx\n" );
 316
 317         /* Restore all registers from CONTEXT */
 318         output( "\tmovw %d(%%ebx), %%ss\n", CONTEXTOFFSET(SegSs) );
 319         output( "\tmovl %d(%%ebx), %%esp\n", CONTEXTOFFSET(Esp) );
 320         output( "\taddl $4, %%esp\n" );  /* room for final return address */
 321
 322         output( "\tpushw %d(%%ebx)\n", CONTEXTOFFSET(SegCs) );
 323         output( "\tpushw %d(%%ebx)\n", CONTEXTOFFSET(Eip) );
 324         output( "\tpushl %%edx\n" );
 325         output( "\tpushl %%eax\n" );
 326         output( "\tpushl %d(%%ebx)\n", CONTEXTOFFSET(EFlags) );
 327         output( "\tpushl %d(%%ebx)\n", CONTEXTOFFSET(SegDs) );
 328
 329         output( "\tpushl %d(%%ebx)\n", CONTEXTOFFSET(SegEs) );
 330         output( "\tpopl %%es\n" );
 331         output( "\tpushl %d(%%ebx)\n", CONTEXTOFFSET(SegFs) );
 332         output( "\tpopl %%fs\n" );
 333         output( "\tpushl %d(%%ebx)\n", CONTEXTOFFSET(SegGs) );
 334         output( "\tpopl %%gs\n" );
 335
 336         output( "\tmovl %d(%%ebx), %%ebp\n", CONTEXTOFFSET(Ebp) );
 337         output( "\tmovl %d(%%ebx), %%esi\n", CONTEXTOFFSET(Esi) );
 338         output( "\tmovl %d(%%ebx), %%edi\n", CONTEXTOFFSET(Edi) );
 339         output( "\tmovl %d(%%ebx), %%eax\n", CONTEXTOFFSET(Eax) );
 340         output( "\tmovl %d(%%ebx), %%edx\n", CONTEXTOFFSET(Edx) );
 341         output( "\tmovl %d(%%ebx), %%ecx\n", CONTEXTOFFSET(Ecx) );
 342         output( "\tmovl %d(%%ebx), %%ebx\n", CONTEXTOFFSET(Ebx) );
 343
 344         output( "\tpopl %%ds\n" );
 345         output( "\tpopfl\n" );
 346         output( "\tlret\n" );
 347     }
 348     else
 349     {
 350         /* Switch stack back */
 351         output( "\t.byte 0x64\n\tmovw (%d), %%ss\n", STACKOFFSET+2 );
 352         output( "\t.byte 0x64\n\tmovzwl (%d), %%esp\n", STACKOFFSET );
 353         output( "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
 354
 355         /* Restore registers */
 356         output( "\tpopl %%edx\n" );
 357         output( "\tpopl %%ecx\n" );
 358         output( "\tpopl %%ebp\n" );
 359         output( "\tpopw %%ds\n" );
 360         output( "\tpopw %%es\n" );
 361         output( "\tpopw %%fs\n" );
 362         output( "\tpopw %%gs\n" );
 363
 364         /* Return to return stub which will return to caller */
 365         output( "\tlret $12\n" );
 366     }
 367     if (thunk) output_function_size( "__wine_call_from_16_thunk" );
 368     else if (reg_func) output_function_size( "__wine_call_from_16_regs" );
 369     else output_function_size( "__wine_call_from_16" );
 370 }
 371
 372
 373 /*******************************************************************
 374  *         BuildCallTo16Core
 375  *
 376  * This routine builds the core routines used in 32->16 thunks:
 377  *
 378  * extern DWORD WINAPI wine_call_to_16( FARPROC16 target, DWORD cbArgs, PEXCEPTION_HANDLER handler );
 379  * extern void WINAPI wine_call_to_16_regs( CONTEXT86 *context, DWORD cbArgs, PEXCEPTION_HANDLER handler );
 380  *
 381  * These routines can be called directly from 32-bit code.
 382  *
 383  * All routines expect that the 16-bit stack contents (arguments) and the
 384  * return address (segptr to CallTo16_Ret) were already set up by the
 385  * caller; nb_args must contain the number of bytes to be conserved.  The
 386  * 16-bit SS:SP will be set accordinly.
 387  *
 388  * All other registers are either taken from the CONTEXT86 structure
 389  * or else set to default values.  The target routine address is either
 390  * given directly or taken from the CONTEXT86.
 391  */
 392 static void BuildCallTo16Core( int reg_func )
 393 {
 394     const char *name = reg_func ? "wine_call_to_16_regs" : "wine_call_to_16";
 395
 396     /* Function header */
 397     function_header( name );
 398
 399     /* Function entry sequence */
 400     output( "\tpushl %%ebp\n" );
 401     output( "\tmovl %%esp, %%ebp\n" );
 402
 403     /* Save the 32-bit registers */
 404     output( "\tpushl %%ebx\n" );
 405     output( "\tpushl %%esi\n" );
 406     output( "\tpushl %%edi\n" );
 407     output( "\t.byte 0x64\n\tmov %%gs,(%d)\n", GS_OFFSET );
 408
 409     /* Setup exception frame */
 410     output( "\t.byte 0x64\n\tpushl (%d)\n", STACKOFFSET );
 411     output( "\tpushl 16(%%ebp)\n" ); /* handler */
 412     output( "\t.byte 0x64\n\tpushl (0)\n" );
 413     output( "\t.byte 0x64\n\tmovl %%esp,(0)\n" );
 414
 415     /* Call the actual CallTo16 routine (simulate a lcall) */
 416     output( "\tpushl %%cs\n" );
 417     output( "\tcall .L%s\n", name );
 418
 419     /* Remove exception frame */
 420     output( "\t.byte 0x64\n\tpopl (0)\n" );
 421     output( "\taddl $4, %%esp\n" );
 422     output( "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
 423
 424     if ( !reg_func )
 425     {
 426         /* Convert return value */
 427         output( "\tandl $0xffff,%%eax\n" );
 428         output( "\tshll $16,%%edx\n" );
 429         output( "\torl %%edx,%%eax\n" );
 430     }
 431     else
 432     {
 433         /*
 434          * Modify CONTEXT86 structure to contain new values
 435          *
 436          * NOTE:  We restore only EAX, EBX, EDX, EDX, EBP, and ESP.
 437          *        The segment registers as well as ESI and EDI should
 438          *        not be modified by a well-behaved 16-bit routine in
 439          *        any case.  [If necessary, we could restore them as well,
 440          *        at the cost of a somewhat less efficient return path.]
 441          */
 442
 443         output( "\tmovl %d(%%esp), %%edi\n", STACK32OFFSET(target) - STACK32OFFSET(edi));
 444                 /* everything above edi has been popped already */
 445
 446         output( "\tmovl %%eax, %d(%%edi)\n", CONTEXTOFFSET(Eax) );
 447         output( "\tmovl %%ebx, %d(%%edi)\n", CONTEXTOFFSET(Ebx) );
 448         output( "\tmovl %%ecx, %d(%%edi)\n", CONTEXTOFFSET(Ecx) );
 449         output( "\tmovl %%edx, %d(%%edi)\n", CONTEXTOFFSET(Edx) );
 450         output( "\tmovl %%ebp, %d(%%edi)\n", CONTEXTOFFSET(Ebp) );
 451         output( "\tmovl %%esi, %d(%%edi)\n", CONTEXTOFFSET(Esp) );
 452                  /* The return glue code saved %esp into %esi */
 453     }
 454
 455     /* Restore the 32-bit registers */
 456     output( "\tpopl %%edi\n" );
 457     output( "\tpopl %%esi\n" );
 458     output( "\tpopl %%ebx\n" );
 459
 460     /* Function exit sequence */
 461     output( "\tpopl %%ebp\n" );
 462     output( "\tret $12\n" );
 463
 464
 465     /* Start of the actual CallTo16 routine */
 466
 467     output( ".L%s:\n", name );
 468
 469     /* Switch to the 16-bit stack */
 470     output( "\tmovl %%esp,%%edx\n" );
 471     output( "\t.byte 0x64\n\tmovw (%d),%%ss\n", STACKOFFSET + 2);
 472     output( "\t.byte 0x64\n\tmovw (%d),%%sp\n", STACKOFFSET );
 473     output( "\t.byte 0x64\n\tmovl %%edx,(%d)\n", STACKOFFSET );
 474
 475     /* Make %bp point to the previous stackframe (built by CallFrom16) */
 476     output( "\tmovzwl %%sp,%%ebp\n" );
 477     output( "\tleal %d(%%ebp),%%ebp\n", STACK16OFFSET(bp) );
 478
 479     /* Add the specified offset to the new sp */
 480     output( "\tsubw %d(%%edx), %%sp\n", STACK32OFFSET(nb_args) );
 481
 482     if (reg_func)
 483     {
 484         /* Push the called routine address */
 485         output( "\tmovl %d(%%edx),%%edx\n", STACK32OFFSET(target) );
 486         output( "\tpushw %d(%%edx)\n", CONTEXTOFFSET(SegCs) );
 487         output( "\tpushw %d(%%edx)\n", CONTEXTOFFSET(Eip) );
 488
 489         /* Get the registers */
 490         output( "\tpushw %d(%%edx)\n", CONTEXTOFFSET(SegDs) );
 491         output( "\tpushl %d(%%edx)\n", CONTEXTOFFSET(SegEs) );
 492         output( "\tpopl %%es\n" );
 493         output( "\tpushl %d(%%edx)\n", CONTEXTOFFSET(SegFs) );
 494         output( "\tpopl %%fs\n" );
 495         output( "\tpushl %d(%%edx)\n", CONTEXTOFFSET(SegGs) );
 496         output( "\tpopl %%gs\n" );
 497         output( "\tmovl %d(%%edx),%%ebp\n", CONTEXTOFFSET(Ebp) );
 498         output( "\tmovl %d(%%edx),%%esi\n", CONTEXTOFFSET(Esi) );
 499         output( "\tmovl %d(%%edx),%%edi\n", CONTEXTOFFSET(Edi) );
 500         output( "\tmovl %d(%%edx),%%eax\n", CONTEXTOFFSET(Eax) );
 501         output( "\tmovl %d(%%edx),%%ebx\n", CONTEXTOFFSET(Ebx) );
 502         output( "\tmovl %d(%%edx),%%ecx\n", CONTEXTOFFSET(Ecx) );
 503         output( "\tmovl %d(%%edx),%%edx\n", CONTEXTOFFSET(Edx) );
 504
 505         /* Get the 16-bit ds */
 506         output( "\tpopw %%ds\n" );
 507     }
 508     else  /* not a register function */
 509     {
 510         /* Push the called routine address */
 511         output( "\tpushl %d(%%edx)\n", STACK32OFFSET(target) );
 512
 513         /* Set %fs and %gs to the value saved by the last CallFrom16 */
 514         output( "\tpushw %d(%%ebp)\n", STACK16OFFSET(fs)-STACK16OFFSET(bp) );
 515         output( "\tpopw %%fs\n" );
 516         output( "\tpushw %d(%%ebp)\n", STACK16OFFSET(gs)-STACK16OFFSET(bp) );
 517         output( "\tpopw %%gs\n" );
 518
 519         /* Set %ds and %es (and %ax just in case) equal to %ss */
 520         output( "\tmovw %%ss,%%ax\n" );
 521         output( "\tmovw %%ax,%%ds\n" );
 522         output( "\tmovw %%ax,%%es\n" );
 523     }
 524
 525     /* Jump to the called routine */
 526     output( "\t.byte 0x66\n" );
 527     output( "\tlret\n" );
 528
 529     /* Function footer */
 530     output_function_size( name );
 531 }
 532
 533
 534 /*******************************************************************
 535  *         BuildRet16Func
 536  *
 537  * Build the return code for 16-bit callbacks
 538  */
 539 static void BuildRet16Func(void)
 540 {
 541     function_header( "__wine_call_to_16_ret" );
 542
 543     /* Save %esp into %esi */
 544     output( "\tmovl %%esp,%%esi\n" );
 545
 546     /* Restore 32-bit segment registers */
 547
 548     output( "\t.byte 0x2e\n\tmovl %s", asm_name("CallTo16_DataSelector") );
 549     output( "-%s,%%edi\n", asm_name("__wine_call16_start") );
 550     output( "\tmovw %%di,%%ds\n" );
 551     output( "\tmovw %%di,%%es\n" );
 552
 553     output( "\t.byte 0x2e\n\tmov %s", asm_name("CallTo16_TebSelector") );
 554     output( "-%s,%%fs\n", asm_name("__wine_call16_start") );
 555
 556     output( "\t.byte 0x64\n\tmov (%d),%%gs\n", GS_OFFSET );
 557
 558     /* Restore the 32-bit stack */
 559
 560     output( "\tmovw %%di,%%ss\n" );
 561     output( "\t.byte 0x64\n\tmovl (%d),%%esp\n", STACKOFFSET );
 562
 563     /* Return to caller */
 564
 565     output( "\tlret\n" );
 566     output_function_size( "__wine_call_to_16_ret" );
 567 }
 568
 569
 570 /*******************************************************************
 571  *         BuildCallTo32CBClient
 572  *
 573  * Call a CBClient relay stub from 32-bit code (KERNEL.620).
 574  *
 575  * Since the relay stub is itself 32-bit, this should not be a problem;
 576  * unfortunately, the relay stubs are expected to switch back to a
 577  * 16-bit stack (and 16-bit code) after completion :-(
 578  *
 579  * This would conflict with our 16- vs. 32-bit stack handling, so
 580  * we simply switch *back* to our 32-bit stack before returning to
 581  * the caller ...
 582  *
 583  * The CBClient relay stub expects to be called with the following
 584  * 16-bit stack layout, and with ebp and ebx pointing into the 16-bit
 585  * stack at the designated places:
 586  *
 587  *    ...
 588  *  (ebp+14) original arguments to the callback routine
 589  *  (ebp+10) far return address to original caller
 590  *  (ebp+6)  Thunklet target address
 591  *  (ebp+2)  Thunklet relay ID code
 592  *  (ebp)    BP (saved by CBClientGlueSL)
 593  *  (ebp-2)  SI (saved by CBClientGlueSL)
 594  *  (ebp-4)  DI (saved by CBClientGlueSL)
 595  *  (ebp-6)  DS (saved by CBClientGlueSL)
 596  *
 597  *   ...     buffer space used by the 16-bit side glue for temp copies
 598  *
 599  *  (ebx+4)  far return address to 16-bit side glue code
 600  *  (ebx)    saved 16-bit ss:sp (pointing to ebx+4)
 601  *
 602  * The 32-bit side glue code accesses both the original arguments (via ebp)
 603  * and the temporary copies prepared by the 16-bit side glue (via ebx).
 604  * After completion, the stub will load ss:sp from the buffer at ebx
 605  * and perform a far return to 16-bit code.
 606  *
 607  * To trick the relay stub into returning to us, we replace the 16-bit
 608  * return address to the glue code by a cs:ip pair pointing to our
 609  * return entry point (the original return address is saved first).
 610  * Our return stub thus called will then reload the 32-bit ss:esp and
 611  * return to 32-bit code (by using and ss:esp value that we have also
 612  * pushed onto the 16-bit stack before and a cs:eip values found at
 613  * that position on the 32-bit stack).  The ss:esp to be restored is
 614  * found relative to the 16-bit stack pointer at:
 615  *
 616  *  (ebx-4)   ss  (flat)
 617  *  (ebx-8)   sp  (32-bit stack pointer)
 618  *
 619  * The second variant of this routine, CALL32_CBClientEx, which is used
 620  * to implement KERNEL.621, has to cope with yet another problem: Here,
 621  * the 32-bit side directly returns to the caller of the CBClient thunklet,
 622  * restoring registers saved by CBClientGlueSL and cleaning up the stack.
 623  * As we have to return to our 32-bit code first, we have to adapt the
 624  * layout of our temporary area so as to include values for the registers
 625  * that are to be restored, and later (in the implementation of KERNEL.621)
 626  * we *really* restore them. The return stub restores DS, DI, SI, and BP
 627  * from the stack, skips the next 8 bytes (CBClient relay code / target),
 628  * and then performs a lret NN, where NN is the number of arguments to be
 629  * removed. Thus, we prepare our temporary area as follows:
 630  *
 631  *     (ebx+22) 16-bit cs  (this segment)
 632  *     (ebx+20) 16-bit ip  ('16-bit' return entry point)
 633  *     (ebx+16) 32-bit ss  (flat)
 634  *     (ebx+12) 32-bit sp  (32-bit stack pointer)
 635  *     (ebx+10) 16-bit bp  (points to ebx+24)
 636  *     (ebx+8)  16-bit si  (ignored)
 637  *     (ebx+6)  16-bit di  (ignored)
 638  *     (ebx+4)  16-bit ds  (we actually use the flat DS here)
 639  *     (ebx+2)  16-bit ss  (16-bit stack segment)
 640  *     (ebx+0)  16-bit sp  (points to ebx+4)
 641  *
 642  * Note that we ensure that DS is not changed and remains the flat segment,
 643  * and the 32-bit stack pointer our own return stub needs fits just
 644  * perfectly into the 8 bytes that are skipped by the Windows stub.
 645  * One problem is that we have to determine the number of removed arguments,
 646  * as these have to be really removed in KERNEL.621. Thus, the BP value
 647  * that we place in the temporary area to be restored, contains the value
 648  * that SP would have if no arguments were removed. By comparing the actual
 649  * value of SP with this value in our return stub we can compute the number
 650  * of removed arguments. This is then returned to KERNEL.621.
 651  *
 652  * The stack layout of this function:
 653  * (ebp+20)  nArgs     pointer to variable receiving nr. of args (Ex only)
 654  * (ebp+16)  esi       pointer to caller's esi value
 655  * (ebp+12)  arg       ebp value to be set for relay stub
 656  * (ebp+8)   func      CBClient relay stub address
 657  * (ebp+4)   ret addr
 658  * (ebp)     ebp
 659  */
 660 static void BuildCallTo32CBClient( BOOL isEx )
 661 {
 662     function_header( isEx ? "CALL32_CBClientEx" : "CALL32_CBClient" );
 663
 664     /* Entry code */
 665
 666     output( "\tpushl %%ebp\n" );
 667     output( "\tmovl %%esp,%%ebp\n" );
 668     output( "\tpushl %%edi\n" );
 669     output( "\tpushl %%esi\n" );
 670     output( "\tpushl %%ebx\n" );
 671
 672     /* Get pointer to temporary area and save the 32-bit stack pointer */
 673
 674     output( "\tmovl 16(%%ebp), %%ebx\n" );
 675     output( "\tleal -8(%%esp), %%eax\n" );
 676
 677     if ( !isEx )
 678         output( "\tmovl %%eax, -8(%%ebx)\n" );
 679     else
 680         output( "\tmovl %%eax, 12(%%ebx)\n" );
 681
 682     /* Set up registers and call CBClient relay stub (simulating a far call) */
 683
 684     output( "\tmovl 20(%%ebp), %%esi\n" );
 685     output( "\tmovl (%%esi), %%esi\n" );
 686
 687     output( "\tmovl 8(%%ebp), %%eax\n" );
 688     output( "\tmovl 12(%%ebp), %%ebp\n" );
 689
 690     output( "\tpushl %%cs\n" );
 691     output( "\tcall *%%eax\n" );
 692
 693     /* Return new esi value to caller */
 694
 695     output( "\tmovl 32(%%esp), %%edi\n" );
 696     output( "\tmovl %%esi, (%%edi)\n" );
 697
 698     /* Return argument size to caller */
 699     if ( isEx )
 700     {
 701         output( "\tmovl 36(%%esp), %%ebx\n" );
 702         output( "\tmovl %%ebp, (%%ebx)\n" );
 703     }
 704
 705     /* Restore registers and return */
 706
 707     output( "\tpopl %%ebx\n" );
 708     output( "\tpopl %%esi\n" );
 709     output( "\tpopl %%edi\n" );
 710     output( "\tpopl %%ebp\n" );
 711     output( "\tret\n" );
 712     output_function_size( isEx ? "CALL32_CBClientEx" : "CALL32_CBClient" );
 713
 714     /* '16-bit' return stub */
 715
 716     function_header( isEx ? "CALL32_CBClientEx_Ret" : "CALL32_CBClient_Ret" );
 717     if ( !isEx )
 718     {
 719         output( "\tmovzwl %%sp, %%ebx\n" );
 720         output( "\tlssl %%ss:-16(%%ebx), %%esp\n" );
 721     }
 722     else
 723     {
 724         output( "\tmovzwl %%bp, %%ebx\n" );
 725         output( "\tsubw %%bp, %%sp\n" );
 726         output( "\tmovzwl %%sp, %%ebp\n" );
 727         output( "\tlssl %%ss:-12(%%ebx), %%esp\n" );
 728     }
 729     output( "\tlret\n" );
 730     output_function_size( isEx ? "CALL32_CBClientEx_Ret" : "CALL32_CBClient_Ret" );
 731 }
 732
 733
 734 /*******************************************************************
 735  *         BuildCallFrom32Regs
 736  *
 737  * Build a 32-bit-to-Wine call-back function for a 'register' function.
 738  * 'args' is the number of dword arguments.
 739  *
 740  * Stack layout:
 741  *   ...
 742  * (ebp+16)  first arg
 743  * (ebp+12)  ret addr to user code
 744  * (ebp+8)   eax saved by relay code
 745  * (ebp+4)   ret addr to relay code
 746  * (ebp+0)   saved ebp
 747  * (ebp-128) buffer area to allow stack frame manipulation
 748  * (ebp-332) CONTEXT86 struct
 749  * (ebp-336) padding for stack alignment
 750  * (ebp-336-n) CONTEXT86 *argument
 751  *  ....     other arguments copied from (ebp+12)
 752  *
 753  * The entry point routine is called with a CONTEXT* extra argument,
 754  * following the normal args. In this context structure, EIP_reg
 755  * contains the return address to user code, and ESP_reg the stack
 756  * pointer on return (with the return address and arguments already
 757  * removed).
 758  */
 759 static void BuildCallFrom32Regs(void)
 760 {
 761     static const int STACK_SPACE = 128 + sizeof(CONTEXT86);
 762
 763     /* Function header */
 764
 765     function_header( "__wine_call_from_32_regs" );
 766
 767     /* Allocate some buffer space on the stack */
 768
 769     output( "\tpushl %%ebp\n" );
 770     output( "\tmovl %%esp,%%ebp\n ");
 771     output( "\tleal -%d(%%esp), %%esp\n", STACK_SPACE + 4 /* for context arg */);
 772
 773     /* Build the context structure */
 774
 775     output( "\tpushfl\n" );
 776     output( "\tpopl %%eax\n" );
 777     output( "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(EFlags) - STACK_SPACE );
 778     output( "\tmovl 0(%%ebp),%%eax\n" );
 779     output( "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Ebp) - STACK_SPACE );
 780     output( "\tmovl 8(%%ebp),%%eax\n" );
 781     output( "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Eax) - STACK_SPACE );
 782     output( "\tmovl %%ebx,%d(%%ebp)\n", CONTEXTOFFSET(Ebx) - STACK_SPACE );
 783     output( "\tmovl %%ecx,%d(%%ebp)\n", CONTEXTOFFSET(Ecx) - STACK_SPACE );
 784     output( "\tmovl %%edx,%d(%%ebp)\n", CONTEXTOFFSET(Edx) - STACK_SPACE );
 785     output( "\tmovl %%esi,%d(%%ebp)\n", CONTEXTOFFSET(Esi) - STACK_SPACE );
 786     output( "\tmovl %%edi,%d(%%ebp)\n", CONTEXTOFFSET(Edi) - STACK_SPACE );
 787
 788     output( "\txorl %%eax,%%eax\n" );
 789     output( "\tmovw %%cs,%%ax\n" );
 790     output( "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegCs) - STACK_SPACE );
 791     output( "\tmovw %%es,%%ax\n" );
 792     output( "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegEs) - STACK_SPACE );
 793     output( "\tmovw %%fs,%%ax\n" );
 794     output( "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegFs) - STACK_SPACE );
 795     output( "\tmovw %%gs,%%ax\n" );
 796     output( "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegGs) - STACK_SPACE );
 797     output( "\tmovw %%ss,%%ax\n" );
 798     output( "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegSs) - STACK_SPACE );
 799     output( "\tmovw %%ds,%%ax\n" );
 800     output( "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegDs) - STACK_SPACE );
 801     output( "\tmovw %%ax,%%es\n" );  /* set %es equal to %ds just in case */
 802
 803     output( "\tmovl $0x%x,%%eax\n", CONTEXT86_FULL );
 804     output( "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(ContextFlags) - STACK_SPACE );
 805
 806     output( "\tmovl 12(%%ebp),%%eax\n" ); /* Get %eip at time of call */
 807     output( "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Eip) - STACK_SPACE );
 808
 809     /* Transfer the arguments */
 810
 811     output( "\tmovl 4(%%ebp),%%ebx\n" );   /* get relay code addr */
 812     output( "\tmovzbl 4(%%ebx),%%ecx\n" ); /* fetch number of args to copy */
 813     output( "\tsubl %%ecx,%%esp\n" );
 814     output( "\tandl $~15,%%esp\n" );
 815     output( "\tleal 16(%%ebp),%%esi\n" );  /* get %esp at time of call */
 816     output( "\tmovl %%esp,%%edi\n" );
 817     output( "\tshrl $2,%%ecx\n" );
 818     output( "\tjz 1f\n" );
 819     output( "\tcld\n" );
 820     output( "\trep\n\tmovsl\n" );  /* copy args */
 821     output( "1:\tleal %d(%%ebp),%%eax\n", -STACK_SPACE );  /* get addr of context struct */
 822     output( "\tmovl %%eax,(%%edi)\n" );    /* and pass it as extra arg */
 823     output( "\tmovzbl 5(%%ebx),%%eax\n" ); /* fetch number of args to remove */
 824     output( "\tleal 16(%%ebp,%%eax),%%eax\n" );
 825     output( "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Esp) - STACK_SPACE );
 826
 827     /* Call the entry point */
 828
 829     output( "\taddl (%%ebx),%%ebx\n" );
 830     output( "\tcall *%%ebx\n" );
 831     output( "\tleal -%d(%%ebp),%%ecx\n", STACK_SPACE );
 832
 833     /* Restore the context structure */
 834
 835     output( "2:\tpushl %d(%%ecx)\n", CONTEXTOFFSET(SegEs) );
 836     output( "\tpopl %%es\n" );
 837     output( "\tpushl %d(%%ecx)\n", CONTEXTOFFSET(SegFs) );
 838     output( "\tpopl %%fs\n" );
 839     output( "\tpushl %d(%%ecx)\n", CONTEXTOFFSET(SegGs) );
 840     output( "\tpopl %%gs\n" );
 841
 842     output( "\tmovl %d(%%ecx),%%edi\n", CONTEXTOFFSET(Edi) );
 843     output( "\tmovl %d(%%ecx),%%esi\n", CONTEXTOFFSET(Esi) );
 844     output( "\tmovl %d(%%ecx),%%edx\n", CONTEXTOFFSET(Edx) );
 845     output( "\tmovl %d(%%ecx),%%ebx\n", CONTEXTOFFSET(Ebx) );
 846     output( "\tmovl %d(%%ecx),%%eax\n", CONTEXTOFFSET(Eax) );
 847     output( "\tmovl %d(%%ecx),%%ebp\n", CONTEXTOFFSET(Ebp) );
 848
 849     output( "\tpushl %d(%%ecx)\n", CONTEXTOFFSET(SegSs) );
 850     output( "\tpopl %%ss\n" );
 851     output( "\tmovl %d(%%ecx),%%esp\n", CONTEXTOFFSET(Esp) );
 852
 853     output( "\tpushl %d(%%ecx)\n", CONTEXTOFFSET(EFlags) );
 854     output( "\tpushl %d(%%ecx)\n", CONTEXTOFFSET(SegCs) );
 855     output( "\tpushl %d(%%ecx)\n", CONTEXTOFFSET(Eip) );
 856     output( "\tpushl %d(%%ecx)\n", CONTEXTOFFSET(SegDs) );
 857     output( "\tmovl %d(%%ecx),%%ecx\n", CONTEXTOFFSET(Ecx) );
 858
 859     output( "\tpopl %%ds\n" );
 860     output( "\tiret\n" );
 861     output_function_size( "__wine_call_from_32_regs" );
 862
 863     function_header( "__wine_call_from_32_restore_regs" );
 864     output( "\tmovl 4(%%esp),%%ecx\n" );
 865     output( "\tjmp 2b\n" );
 866     output_function_size( "__wine_call_from_32_restore_regs" );
 867 }
 868
 869
 870 /*******************************************************************
 871  *         BuildPendingEventCheck
 872  *
 873  * Build a function that checks whether there are any
 874  * pending DPMI events.
 875  *
 876  * Stack layout:
 877  *
 878  * (sp+12) long   eflags
 879  * (sp+6)  long   cs
 880  * (sp+2)  long   ip
 881  * (sp)    word   fs
 882  *
 883  * On entry to function, fs register points to a valid TEB.
 884  * On exit from function, stack will be popped.
 885  */
 886 static void BuildPendingEventCheck(void)
 887 {
 888     /* Function header */
 889
 890     function_header( "DPMI_PendingEventCheck" );
 891
 892     /* Check for pending events. */
 893
 894     output( "\t.byte 0x64\n\ttestl $0xffffffff,(%d)\n", STRUCTOFFSET(TEB,vm86_pending) );
 895     output( "\tje %s\n", asm_name("DPMI_PendingEventCheck_Cleanup") );
 896     output( "\t.byte 0x64\n\ttestl $0xffffffff,(%d)\n", STRUCTOFFSET(TEB,dpmi_vif) );
 897     output( "\tje %s\n", asm_name("DPMI_PendingEventCheck_Cleanup") );
 898
 899     /* Process pending events. */
 900
 901     output( "\tsti\n" );
 902
 903     /* Start cleanup. Restore fs register. */
 904
 905     output( "%s\n", asm_globl("DPMI_PendingEventCheck_Cleanup") );
 906     output( "\tpopw %%fs\n" );
 907
 908     /* Return from function. */
 909
 910     output( "%s\n", asm_globl("DPMI_PendingEventCheck_Return") );
 911     output( "\tiret\n" );
 912
 913     output_function_size( "DPMI_PendingEventCheck" );
 914 }
 915
 916
 917 /*******************************************************************
 918  *         BuildRelays16
 919  *
 920  * Build all the 16-bit relay callbacks
 921  */
 922 void BuildRelays16(void)
 923 {
 924     if (target_cpu != CPU_x86)
 925     {
 926         output( "/* File not used with this architecture. Do not edit! */\n\n" );
 927         return;
 928     }
 929
 930     /* File header */
 931
 932     output( "/* File generated automatically. Do not edit! */\n\n" );
 933     output( "\t.text\n" );
 934
 935     output( "%s:\n\n", asm_name("__wine_spec_thunk_text_16") );
 936
 937     output( "%s\n", asm_globl("__wine_call16_start") );
 938
 939     /* Standard CallFrom16 routine */
 940     BuildCallFrom16Core( FALSE, FALSE );
 941
 942     /* Register CallFrom16 routine */
 943     BuildCallFrom16Core( TRUE, FALSE );
 944
 945     /* C16ThkSL CallFrom16 routine */
 946     BuildCallFrom16Core( FALSE, TRUE );
 947
 948     /* Standard CallTo16 routine */
 949     BuildCallTo16Core( 0 );
 950
 951     /* Register CallTo16 routine */
 952     BuildCallTo16Core( 1 );
 953
 954     /* Standard CallTo16 return stub */
 955     BuildRet16Func();
 956
 957     /* CBClientThunkSL routine */
 958     BuildCallTo32CBClient( FALSE );
 959
 960     /* CBClientThunkSLEx routine */
 961     BuildCallTo32CBClient( TRUE  );
 962
 963     /* Pending DPMI events check stub */
 964     BuildPendingEventCheck();
 965
 966     output( "%s\n", asm_globl("__wine_call16_end") );
 967     output_function_size( "__wine_spec_thunk_text_16" );
 968
 969     /* Declare the return address and data selector variables */
 970     output( "\n\t.data\n\t.align %d\n", get_alignment(4) );
 971     output( "%s\n\t.long 0\n", asm_globl("CallTo16_DataSelector") );
 972     output( "%s\n\t.long 0\n", asm_globl("CallTo16_TebSelector") );
 973     if (UsePIC) output( "wine_ldt_copy_ptr:\t.long %s\n", asm_name("wine_ldt_copy") );
 974     output_gnu_stack_note();
 975 }
 976
 977 /*******************************************************************
 978  *         BuildRelays32
 979  *
 980  * Build all the 32-bit relay callbacks
 981  */
 982 void BuildRelays32(void)
 983 {
 984     if (target_cpu != CPU_x86)
 985     {
 986         output( "/* File not used with this architecture. Do not edit! */\n\n" );
 987         return;
 988     }
 989
 990     /* File header */
 991
 992     output( "/* File generated automatically. Do not edit! */\n\n" );
 993     output( "\t.text\n" );
 994     output( "%s:\n\n", asm_name("__wine_spec_thunk_text_32") );
 995
 996     /* 32-bit register entry point */
 997     BuildCallFrom32Regs();
 998
 999     output_function_size( "__wine_spec_thunk_text_32" );
1000     output_gnu_stack_note();
1001 }