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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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 static void function_header( FILE *outfile, const char *name )
  36 {
  37     fprintf( outfile, "\n\t.align %d\n", get_alignment(4) );
  38     fprintf( outfile, "\t%s\n", func_declaration(name) );
  39     fprintf( outfile, "%s\n", asm_globl(name) );
  40 }
  41
  42
  43 static inline const char *data16_prefix(void)
  44 {
  45     return (target_platform == PLATFORM_SVR4) ? "\tdata16\n" : "";
  46 }
  47
  48 /*******************************************************************
  49  *         BuildCallFrom16Core
  50  *
  51  * This routine builds the core routines used in 16->32 thunks:
  52  * CallFrom16Word, CallFrom16Long, CallFrom16Register, and CallFrom16Thunk.
  53  *
  54  * These routines are intended to be called via a far call (with 32-bit
  55  * operand size) from 16-bit code.  The 16-bit code stub must push %bp,
  56  * the 32-bit entry point to be called, and the argument conversion
  57  * routine to be used (see stack layout below).
  58  *
  59  * The core routine completes the STACK16FRAME on the 16-bit stack and
  60  * switches to the 32-bit stack.  Then, the argument conversion routine
  61  * is called; it gets passed the 32-bit entry point and a pointer to the
  62  * 16-bit arguments (on the 16-bit stack) as parameters. (You can either
  63  * use conversion routines automatically generated by BuildCallFrom16,
  64  * or write your own for special purposes.)
  65  *
  66  * The conversion routine must call the 32-bit entry point, passing it
  67  * the converted arguments, and return its return value to the core.
  68  * After the conversion routine has returned, the core switches back
  69  * to the 16-bit stack, converts the return value to the DX:AX format
  70  * (CallFrom16Long), and returns to the 16-bit call stub.  All parameters,
  71  * including %bp, are popped off the stack.
  72  *
  73  * The 16-bit call stub now returns to the caller, popping the 16-bit
  74  * arguments if necessary (pascal calling convention).
  75  *
  76  * In the case of a 'register' function, CallFrom16Register fills a
  77  * CONTEXT86 structure with the values all registers had at the point
  78  * the first instruction of the 16-bit call stub was about to be
  79  * executed.  A pointer to this CONTEXT86 is passed as third parameter
  80  * to the argument conversion routine, which typically passes it on
  81  * to the called 32-bit entry point.
  82  *
  83  * CallFrom16Thunk is a special variant used by the implementation of
  84  * the Win95 16->32 thunk functions C16ThkSL and C16ThkSL01 and is
  85  * implemented as follows:
  86  * On entry, the EBX register is set up to contain a flat pointer to the
  87  * 16-bit stack such that EBX+22 points to the first argument.
  88  * Then, the entry point is called, while EBP is set up to point
  89  * to the return address (on the 32-bit stack).
  90  * The called function returns with CX set to the number of bytes
  91  * to be popped of the caller's stack.
  92  *
  93  * Stack layout upon entry to the core routine (STACK16FRAME):
  94  *  ...           ...
  95  * (sp+24) word   first 16-bit arg
  96  * (sp+22) word   cs
  97  * (sp+20) word   ip
  98  * (sp+18) word   bp
  99  * (sp+14) long   32-bit entry point (reused for Win16 mutex recursion count)
 100  * (sp+12) word   ip of actual entry point (necessary for relay debugging)
 101  * (sp+8)  long   relay (argument conversion) function entry point
 102  * (sp+4)  long   cs of 16-bit entry point
 103  * (sp)    long   ip of 16-bit entry point
 104  *
 105  * Added on the stack:
 106  * (sp-2)  word   saved gs
 107  * (sp-4)  word   saved fs
 108  * (sp-6)  word   saved es
 109  * (sp-8)  word   saved ds
 110  * (sp-12) long   saved ebp
 111  * (sp-16) long   saved ecx
 112  * (sp-20) long   saved edx
 113  * (sp-24) long   saved previous stack
 114  */
 115 static void BuildCallFrom16Core( FILE *outfile, int reg_func, int thunk )
 116 {
 117     /* Function header */
 118     if (thunk) function_header( outfile, "__wine_call_from_16_thunk" );
 119     else if (reg_func) function_header( outfile, "__wine_call_from_16_regs" );
 120     else function_header( outfile, "__wine_call_from_16" );
 121
 122     /* Create STACK16FRAME (except STACK32FRAME link) */
 123     fprintf( outfile, "\tpushw %%gs\n" );
 124     fprintf( outfile, "\tpushw %%fs\n" );
 125     fprintf( outfile, "\tpushw %%es\n" );
 126     fprintf( outfile, "\tpushw %%ds\n" );
 127     fprintf( outfile, "\tpushl %%ebp\n" );
 128     fprintf( outfile, "\tpushl %%ecx\n" );
 129     fprintf( outfile, "\tpushl %%edx\n" );
 130
 131     /* Save original EFlags register */
 132     if (reg_func) fprintf( outfile, "\tpushfl\n" );
 133
 134     if ( UsePIC )
 135     {
 136         fprintf( outfile, "\tcall 1f\n" );
 137         fprintf( outfile, "1:\tpopl %%ecx\n" );
 138         fprintf( outfile, "\t.byte 0x2e\n\tmovl %s-1b(%%ecx),%%edx\n",
 139                  asm_name("CallTo16_DataSelector") );
 140     }
 141     else
 142         fprintf( outfile, "\t.byte 0x2e\n\tmovl %s,%%edx\n", asm_name("CallTo16_DataSelector") );
 143
 144     /* Load 32-bit segment registers */
 145     fprintf( outfile, "%s\tmovw %%dx, %%ds\n", data16_prefix() );
 146     fprintf( outfile, "%s\tmovw %%dx, %%es\n", data16_prefix() );
 147
 148     if ( UsePIC )
 149         fprintf( outfile, "\tmovw %s-1b(%%ecx), %%fs\n", asm_name("CallTo16_TebSelector") );
 150     else
 151         fprintf( outfile, "\tmovw %s, %%fs\n", asm_name("CallTo16_TebSelector") );
 152
 153     fprintf( outfile, "\t.byte 0x64\n\tmov (%d),%%gs\n", STRUCTOFFSET(TEB,gs_sel) );
 154
 155     /* Translate STACK16FRAME base to flat offset in %edx */
 156     fprintf( outfile, "\tmovw %%ss, %%dx\n" );
 157     fprintf( outfile, "\tandl $0xfff8, %%edx\n" );
 158     fprintf( outfile, "\tshrl $1, %%edx\n" );
 159     if (UsePIC)
 160     {
 161         fprintf( outfile, "\taddl wine_ldt_copy_ptr-1b(%%ecx),%%edx\n" );
 162         fprintf( outfile, "\tmovl (%%edx), %%edx\n" );
 163     }
 164     else
 165         fprintf( outfile, "\tmovl %s(%%edx), %%edx\n", asm_name("wine_ldt_copy") );
 166     fprintf( outfile, "\tmovzwl %%sp, %%ebp\n" );
 167     fprintf( outfile, "\tleal %d(%%ebp,%%edx), %%edx\n", reg_func ? 0 : -4 );
 168
 169     /* Get saved flags into %ecx */
 170     if (reg_func) fprintf( outfile, "\tpopl %%ecx\n" );
 171
 172     /* Get the 32-bit stack pointer from the TEB and complete STACK16FRAME */
 173     fprintf( outfile, "\t.byte 0x64\n\tmovl (%d), %%ebp\n", STACKOFFSET );
 174     fprintf( outfile, "\tpushl %%ebp\n" );
 175
 176     /* Switch stacks */
 177     fprintf( outfile, "%s\t.byte 0x64\n\tmovw %%ss, (%d)\n", data16_prefix(), STACKOFFSET + 2 );
 178     fprintf( outfile, "\t.byte 0x64\n\tmovw %%sp, (%d)\n", STACKOFFSET );
 179     fprintf( outfile, "\tpushl %%ds\n" );
 180     fprintf( outfile, "\tpopl %%ss\n" );
 181     fprintf( outfile, "\tmovl %%ebp, %%esp\n" );
 182     fprintf( outfile, "\taddl $%d, %%ebp\n", STRUCTOFFSET(STACK32FRAME, ebp) );
 183
 184
 185     /* At this point:
 186        STACK16FRAME is completely set up
 187        DS, ES, SS: flat data segment
 188        FS: current TEB
 189        ESP: points to last STACK32FRAME
 190        EBP: points to ebp member of last STACK32FRAME
 191        EDX: points to current STACK16FRAME
 192        ECX: contains saved flags
 193        all other registers: unchanged */
 194
 195     /* Special case: C16ThkSL stub */
 196     if ( thunk )
 197     {
 198         /* Set up registers as expected and call thunk */
 199         fprintf( outfile, "\tleal %d(%%edx), %%ebx\n", sizeof(STACK16FRAME)-22 );
 200         fprintf( outfile, "\tleal -4(%%esp), %%ebp\n" );
 201
 202         fprintf( outfile, "\tcall *%d(%%edx)\n", STACK16OFFSET(entry_point) );
 203
 204         /* Switch stack back */
 205         fprintf( outfile, "\t.byte 0x64\n\tmovw (%d), %%ss\n", STACKOFFSET+2 );
 206         fprintf( outfile, "\t.byte 0x64\n\tmovzwl (%d), %%esp\n", STACKOFFSET );
 207         fprintf( outfile, "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
 208
 209         /* Restore registers and return directly to caller */
 210         fprintf( outfile, "\taddl $8, %%esp\n" );
 211         fprintf( outfile, "\tpopl %%ebp\n" );
 212         fprintf( outfile, "\tpopw %%ds\n" );
 213         fprintf( outfile, "\tpopw %%es\n" );
 214         fprintf( outfile, "\tpopw %%fs\n" );
 215         fprintf( outfile, "\tpopw %%gs\n" );
 216         fprintf( outfile, "\taddl $20, %%esp\n" );
 217
 218         fprintf( outfile, "\txorb %%ch, %%ch\n" );
 219         fprintf( outfile, "\tpopl %%ebx\n" );
 220         fprintf( outfile, "\taddw %%cx, %%sp\n" );
 221         fprintf( outfile, "\tpush %%ebx\n" );
 222
 223         fprintf( outfile, "\t.byte 0x66\n" );
 224         fprintf( outfile, "\tlret\n" );
 225
 226         return;
 227     }
 228
 229
 230     /* Build register CONTEXT */
 231     if ( reg_func )
 232     {
 233         fprintf( outfile, "\tsubl $%d, %%esp\n", sizeof(CONTEXT86) );
 234
 235         fprintf( outfile, "\tmovl %%ecx, %d(%%esp)\n", CONTEXTOFFSET(EFlags) );
 236
 237         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Eax) );
 238         fprintf( outfile, "\tmovl %%ebx, %d(%%esp)\n", CONTEXTOFFSET(Ebx) );
 239         fprintf( outfile, "\tmovl %%esi, %d(%%esp)\n", CONTEXTOFFSET(Esi) );
 240         fprintf( outfile, "\tmovl %%edi, %d(%%esp)\n", CONTEXTOFFSET(Edi) );
 241
 242         fprintf( outfile, "\tmovl %d(%%edx), %%eax\n", STACK16OFFSET(ebp) );
 243         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Ebp) );
 244         fprintf( outfile, "\tmovl %d(%%edx), %%eax\n", STACK16OFFSET(ecx) );
 245         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Ecx) );
 246         fprintf( outfile, "\tmovl %d(%%edx), %%eax\n", STACK16OFFSET(edx) );
 247         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Edx) );
 248
 249         fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(ds) );
 250         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegDs) );
 251         fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(es) );
 252         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegEs) );
 253         fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(fs) );
 254         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegFs) );
 255         fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(gs) );
 256         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegGs) );
 257
 258         fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(cs) );
 259         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegCs) );
 260         fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(ip) );
 261         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Eip) );
 262
 263         fprintf( outfile, "\t.byte 0x64\n\tmovzwl (%d), %%eax\n", STACKOFFSET+2 );
 264         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegSs) );
 265         fprintf( outfile, "\t.byte 0x64\n\tmovzwl (%d), %%eax\n", STACKOFFSET );
 266         fprintf( outfile, "\taddl $%d, %%eax\n", STACK16OFFSET(ip) );
 267         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Esp) );
 268 #if 0
 269         fprintf( outfile, "\tfsave %d(%%esp)\n", CONTEXTOFFSET(FloatSave) );
 270 #endif
 271
 272         /* Push address of CONTEXT86 structure -- popped by the relay routine */
 273         fprintf( outfile, "\tmovl %%esp,%%eax\n" );
 274         fprintf( outfile, "\tandl $~15,%%esp\n" );
 275         fprintf( outfile, "\tsubl $4,%%esp\n" );
 276         fprintf( outfile, "\tpushl %%eax\n" );
 277     }
 278     else
 279     {
 280         fprintf( outfile, "\tsubl $8,%%esp\n" );
 281         fprintf( outfile, "\tandl $~15,%%esp\n" );
 282         fprintf( outfile, "\taddl $8,%%esp\n" );
 283     }
 284
 285     /* Call relay routine (which will call the API entry point) */
 286     fprintf( outfile, "\tleal %d(%%edx), %%eax\n", sizeof(STACK16FRAME) );
 287     fprintf( outfile, "\tpushl %%eax\n" );
 288     fprintf( outfile, "\tpushl %d(%%edx)\n", STACK16OFFSET(entry_point) );
 289     fprintf( outfile, "\tcall *%d(%%edx)\n", STACK16OFFSET(relay) );
 290
 291     if ( reg_func )
 292     {
 293         fprintf( outfile, "\tleal -%d(%%ebp), %%ebx\n",
 294                  sizeof(CONTEXT) + STRUCTOFFSET(STACK32FRAME, ebp) );
 295
 296         /* Switch stack back */
 297         fprintf( outfile, "\t.byte 0x64\n\tmovw (%d), %%ss\n", STACKOFFSET+2 );
 298         fprintf( outfile, "\t.byte 0x64\n\tmovzwl (%d), %%esp\n", STACKOFFSET );
 299         fprintf( outfile, "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
 300
 301         /* Get return address to CallFrom16 stub */
 302         fprintf( outfile, "\taddw $%d, %%sp\n", STACK16OFFSET(callfrom_ip)-4 );
 303         fprintf( outfile, "\tpopl %%eax\n" );
 304         fprintf( outfile, "\tpopl %%edx\n" );
 305
 306         /* Restore all registers from CONTEXT */
 307         fprintf( outfile, "\tmovw %d(%%ebx), %%ss\n", CONTEXTOFFSET(SegSs) );
 308         fprintf( outfile, "\tmovl %d(%%ebx), %%esp\n", CONTEXTOFFSET(Esp) );
 309         fprintf( outfile, "\taddl $4, %%esp\n" );  /* room for final return address */
 310
 311         fprintf( outfile, "\tpushw %d(%%ebx)\n", CONTEXTOFFSET(SegCs) );
 312         fprintf( outfile, "\tpushw %d(%%ebx)\n", CONTEXTOFFSET(Eip) );
 313         fprintf( outfile, "\tpushl %%edx\n" );
 314         fprintf( outfile, "\tpushl %%eax\n" );
 315         fprintf( outfile, "\tpushl %d(%%ebx)\n", CONTEXTOFFSET(EFlags) );
 316         fprintf( outfile, "\tpushl %d(%%ebx)\n", CONTEXTOFFSET(SegDs) );
 317
 318         fprintf( outfile, "\tpushl %d(%%ebx)\n", CONTEXTOFFSET(SegEs) );
 319         fprintf( outfile, "\tpopl %%es\n" );
 320         fprintf( outfile, "\tpushl %d(%%ebx)\n", CONTEXTOFFSET(SegFs) );
 321         fprintf( outfile, "\tpopl %%fs\n" );
 322         fprintf( outfile, "\tpushl %d(%%ebx)\n", CONTEXTOFFSET(SegGs) );
 323         fprintf( outfile, "\tpopl %%gs\n" );
 324
 325         fprintf( outfile, "\tmovl %d(%%ebx), %%ebp\n", CONTEXTOFFSET(Ebp) );
 326         fprintf( outfile, "\tmovl %d(%%ebx), %%esi\n", CONTEXTOFFSET(Esi) );
 327         fprintf( outfile, "\tmovl %d(%%ebx), %%edi\n", CONTEXTOFFSET(Edi) );
 328         fprintf( outfile, "\tmovl %d(%%ebx), %%eax\n", CONTEXTOFFSET(Eax) );
 329         fprintf( outfile, "\tmovl %d(%%ebx), %%edx\n", CONTEXTOFFSET(Edx) );
 330         fprintf( outfile, "\tmovl %d(%%ebx), %%ecx\n", CONTEXTOFFSET(Ecx) );
 331         fprintf( outfile, "\tmovl %d(%%ebx), %%ebx\n", CONTEXTOFFSET(Ebx) );
 332
 333         fprintf( outfile, "\tpopl %%ds\n" );
 334         fprintf( outfile, "\tpopfl\n" );
 335         fprintf( outfile, "\tlret\n" );
 336     }
 337     else
 338     {
 339         /* Switch stack back */
 340         fprintf( outfile, "\t.byte 0x64\n\tmovw (%d), %%ss\n", STACKOFFSET+2 );
 341         fprintf( outfile, "\t.byte 0x64\n\tmovzwl (%d), %%esp\n", STACKOFFSET );
 342         fprintf( outfile, "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
 343
 344         /* Restore registers */
 345         fprintf( outfile, "\tpopl %%edx\n" );
 346         fprintf( outfile, "\tpopl %%ecx\n" );
 347         fprintf( outfile, "\tpopl %%ebp\n" );
 348         fprintf( outfile, "\tpopw %%ds\n" );
 349         fprintf( outfile, "\tpopw %%es\n" );
 350         fprintf( outfile, "\tpopw %%fs\n" );
 351         fprintf( outfile, "\tpopw %%gs\n" );
 352
 353         /* Return to return stub which will return to caller */
 354         fprintf( outfile, "\tlret $12\n" );
 355     }
 356     if (thunk) output_function_size( outfile, "__wine_call_from_16_thunk" );
 357     else if (reg_func) output_function_size( outfile, "__wine_call_from_16_regs" );
 358     else output_function_size( outfile, "__wine_call_from_16" );
 359 }
 360
 361
 362 /*******************************************************************
 363  *         BuildCallTo16Core
 364  *
 365  * This routine builds the core routines used in 32->16 thunks:
 366  *
 367  * extern DWORD WINAPI wine_call_to_16( FARPROC16 target, DWORD cbArgs, PEXCEPTION_HANDLER handler );
 368  * extern void WINAPI wine_call_to_16_regs( CONTEXT86 *context, DWORD cbArgs, PEXCEPTION_HANDLER handler );
 369  *
 370  * These routines can be called directly from 32-bit code.
 371  *
 372  * All routines expect that the 16-bit stack contents (arguments) and the
 373  * return address (segptr to CallTo16_Ret) were already set up by the
 374  * caller; nb_args must contain the number of bytes to be conserved.  The
 375  * 16-bit SS:SP will be set accordinly.
 376  *
 377  * All other registers are either taken from the CONTEXT86 structure
 378  * or else set to default values.  The target routine address is either
 379  * given directly or taken from the CONTEXT86.
 380  */
 381 static void BuildCallTo16Core( FILE *outfile, int reg_func )
 382 {
 383     const char *name = reg_func ? "wine_call_to_16_regs" : "wine_call_to_16";
 384
 385     /* Function header */
 386     function_header( outfile, name );
 387
 388     /* Function entry sequence */
 389     fprintf( outfile, "\tpushl %%ebp\n" );
 390     fprintf( outfile, "\tmovl %%esp, %%ebp\n" );
 391
 392     /* Save the 32-bit registers */
 393     fprintf( outfile, "\tpushl %%ebx\n" );
 394     fprintf( outfile, "\tpushl %%esi\n" );
 395     fprintf( outfile, "\tpushl %%edi\n" );
 396     fprintf( outfile, "\t.byte 0x64\n\tmov %%gs,(%d)\n", STRUCTOFFSET(TEB,gs_sel) );
 397
 398     /* Setup exception frame */
 399     fprintf( outfile, "\t.byte 0x64\n\tpushl (%d)\n", STACKOFFSET );
 400     fprintf( outfile, "\tpushl 16(%%ebp)\n" ); /* handler */
 401     fprintf( outfile, "\t.byte 0x64\n\tpushl (%d)\n", STRUCTOFFSET(TEB,Tib.ExceptionList) );
 402     fprintf( outfile, "\t.byte 0x64\n\tmovl %%esp,(%d)\n", STRUCTOFFSET(TEB,Tib.ExceptionList) );
 403
 404     /* Call the actual CallTo16 routine (simulate a lcall) */
 405     fprintf( outfile, "\tpushl %%cs\n" );
 406     fprintf( outfile, "\tcall .L%s\n", name );
 407
 408     /* Remove exception frame */
 409     fprintf( outfile, "\t.byte 0x64\n\tpopl (%d)\n", STRUCTOFFSET(TEB,Tib.ExceptionList) );
 410     fprintf( outfile, "\taddl $4, %%esp\n" );
 411     fprintf( outfile, "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
 412
 413     if ( !reg_func )
 414     {
 415         /* Convert return value */
 416         fprintf( outfile, "\tandl $0xffff,%%eax\n" );
 417         fprintf( outfile, "\tshll $16,%%edx\n" );
 418         fprintf( outfile, "\torl %%edx,%%eax\n" );
 419     }
 420     else
 421     {
 422         /*
 423          * Modify CONTEXT86 structure to contain new values
 424          *
 425          * NOTE:  We restore only EAX, EBX, EDX, EDX, EBP, and ESP.
 426          *        The segment registers as well as ESI and EDI should
 427          *        not be modified by a well-behaved 16-bit routine in
 428          *        any case.  [If necessary, we could restore them as well,
 429          *        at the cost of a somewhat less efficient return path.]
 430          */
 431
 432         fprintf( outfile, "\tmovl %d(%%esp), %%edi\n", STACK32OFFSET(target) - STACK32OFFSET(edi));
 433                 /* everything above edi has been popped already */
 434
 435         fprintf( outfile, "\tmovl %%eax, %d(%%edi)\n", CONTEXTOFFSET(Eax) );
 436         fprintf( outfile, "\tmovl %%ebx, %d(%%edi)\n", CONTEXTOFFSET(Ebx) );
 437         fprintf( outfile, "\tmovl %%ecx, %d(%%edi)\n", CONTEXTOFFSET(Ecx) );
 438         fprintf( outfile, "\tmovl %%edx, %d(%%edi)\n", CONTEXTOFFSET(Edx) );
 439         fprintf( outfile, "\tmovl %%ebp, %d(%%edi)\n", CONTEXTOFFSET(Ebp) );
 440         fprintf( outfile, "\tmovl %%esi, %d(%%edi)\n", CONTEXTOFFSET(Esp) );
 441                  /* The return glue code saved %esp into %esi */
 442     }
 443
 444     /* Restore the 32-bit registers */
 445     fprintf( outfile, "\tpopl %%edi\n" );
 446     fprintf( outfile, "\tpopl %%esi\n" );
 447     fprintf( outfile, "\tpopl %%ebx\n" );
 448
 449     /* Function exit sequence */
 450     fprintf( outfile, "\tpopl %%ebp\n" );
 451     fprintf( outfile, "\tret $12\n" );
 452
 453
 454     /* Start of the actual CallTo16 routine */
 455
 456     fprintf( outfile, ".L%s:\n", name );
 457
 458     /* Switch to the 16-bit stack */
 459     fprintf( outfile, "\tmovl %%esp,%%edx\n" );
 460     fprintf( outfile, "%s\t.byte 0x64\n\tmovw (%d),%%ss\n", data16_prefix(), STACKOFFSET + 2);
 461     fprintf( outfile, "\t.byte 0x64\n\tmovw (%d),%%sp\n", STACKOFFSET );
 462     fprintf( outfile, "\t.byte 0x64\n\tmovl %%edx,(%d)\n", STACKOFFSET );
 463
 464     /* Make %bp point to the previous stackframe (built by CallFrom16) */
 465     fprintf( outfile, "\tmovzwl %%sp,%%ebp\n" );
 466     fprintf( outfile, "\tleal %d(%%ebp),%%ebp\n", STACK16OFFSET(bp) );
 467
 468     /* Add the specified offset to the new sp */
 469     fprintf( outfile, "\tsubw %d(%%edx), %%sp\n", STACK32OFFSET(nb_args) );
 470
 471     if (reg_func)
 472     {
 473         /* Push the called routine address */
 474         fprintf( outfile, "\tmovl %d(%%edx),%%edx\n", STACK32OFFSET(target) );
 475         fprintf( outfile, "\tpushw %d(%%edx)\n", CONTEXTOFFSET(SegCs) );
 476         fprintf( outfile, "\tpushw %d(%%edx)\n", CONTEXTOFFSET(Eip) );
 477
 478         /* Get the registers */
 479         fprintf( outfile, "\tpushw %d(%%edx)\n", CONTEXTOFFSET(SegDs) );
 480         fprintf( outfile, "\tpushl %d(%%edx)\n", CONTEXTOFFSET(SegEs) );
 481         fprintf( outfile, "\tpopl %%es\n" );
 482         fprintf( outfile, "\tpushl %d(%%edx)\n", CONTEXTOFFSET(SegFs) );
 483         fprintf( outfile, "\tpopl %%fs\n" );
 484         fprintf( outfile, "\tpushl %d(%%edx)\n", CONTEXTOFFSET(SegGs) );
 485         fprintf( outfile, "\tpopl %%gs\n" );
 486         fprintf( outfile, "\tmovl %d(%%edx),%%ebp\n", CONTEXTOFFSET(Ebp) );
 487         fprintf( outfile, "\tmovl %d(%%edx),%%esi\n", CONTEXTOFFSET(Esi) );
 488         fprintf( outfile, "\tmovl %d(%%edx),%%edi\n", CONTEXTOFFSET(Edi) );
 489         fprintf( outfile, "\tmovl %d(%%edx),%%eax\n", CONTEXTOFFSET(Eax) );
 490         fprintf( outfile, "\tmovl %d(%%edx),%%ebx\n", CONTEXTOFFSET(Ebx) );
 491         fprintf( outfile, "\tmovl %d(%%edx),%%ecx\n", CONTEXTOFFSET(Ecx) );
 492         fprintf( outfile, "\tmovl %d(%%edx),%%edx\n", CONTEXTOFFSET(Edx) );
 493
 494         /* Get the 16-bit ds */
 495         fprintf( outfile, "\tpopw %%ds\n" );
 496     }
 497     else  /* not a register function */
 498     {
 499         /* Push the called routine address */
 500         fprintf( outfile, "\tpushl %d(%%edx)\n", STACK32OFFSET(target) );
 501
 502         /* Set %fs and %gs to the value saved by the last CallFrom16 */
 503         fprintf( outfile, "\tpushw %d(%%ebp)\n", STACK16OFFSET(fs)-STACK16OFFSET(bp) );
 504         fprintf( outfile, "\tpopw %%fs\n" );
 505         fprintf( outfile, "\tpushw %d(%%ebp)\n", STACK16OFFSET(gs)-STACK16OFFSET(bp) );
 506         fprintf( outfile, "\tpopw %%gs\n" );
 507
 508         /* Set %ds and %es (and %ax just in case) equal to %ss */
 509         fprintf( outfile, "\tmovw %%ss,%%ax\n" );
 510         fprintf( outfile, "\tmovw %%ax,%%ds\n" );
 511         fprintf( outfile, "\tmovw %%ax,%%es\n" );
 512     }
 513
 514     /* Jump to the called routine */
 515     fprintf( outfile, "\t.byte 0x66\n" );
 516     fprintf( outfile, "\tlret\n" );
 517
 518     /* Function footer */
 519     output_function_size( outfile, name );
 520 }
 521
 522
 523 /*******************************************************************
 524  *         BuildRet16Func
 525  *
 526  * Build the return code for 16-bit callbacks
 527  */
 528 static void BuildRet16Func( FILE *outfile )
 529 {
 530     function_header( outfile, "__wine_call_to_16_ret" );
 531
 532     /* Save %esp into %esi */
 533     fprintf( outfile, "\tmovl %%esp,%%esi\n" );
 534
 535     /* Restore 32-bit segment registers */
 536
 537     fprintf( outfile, "\t.byte 0x2e\n\tmovl %s", asm_name("CallTo16_DataSelector") );
 538     fprintf( outfile, "-%s,%%edi\n", asm_name("__wine_call16_start") );
 539     fprintf( outfile, "%s\tmovw %%di,%%ds\n", data16_prefix() );
 540     fprintf( outfile, "%s\tmovw %%di,%%es\n", data16_prefix() );
 541
 542     fprintf( outfile, "\t.byte 0x2e\n\tmov %s", asm_name("CallTo16_TebSelector") );
 543     fprintf( outfile, "-%s,%%fs\n", asm_name("__wine_call16_start") );
 544
 545     fprintf( outfile, "\t.byte 0x64\n\tmov (%d),%%gs\n", STRUCTOFFSET(TEB,gs_sel) );
 546
 547     /* Restore the 32-bit stack */
 548
 549     fprintf( outfile, "%s\tmovw %%di,%%ss\n", data16_prefix() );
 550     fprintf( outfile, "\t.byte 0x64\n\tmovl (%d),%%esp\n", STACKOFFSET );
 551
 552     /* Return to caller */
 553
 554     fprintf( outfile, "\tlret\n" );
 555     output_function_size( outfile, "__wine_call_to_16_ret" );
 556 }
 557
 558
 559 /*******************************************************************
 560  *         BuildCallTo32CBClient
 561  *
 562  * Call a CBClient relay stub from 32-bit code (KERNEL.620).
 563  *
 564  * Since the relay stub is itself 32-bit, this should not be a problem;
 565  * unfortunately, the relay stubs are expected to switch back to a
 566  * 16-bit stack (and 16-bit code) after completion :-(
 567  *
 568  * This would conflict with our 16- vs. 32-bit stack handling, so
 569  * we simply switch *back* to our 32-bit stack before returning to
 570  * the caller ...
 571  *
 572  * The CBClient relay stub expects to be called with the following
 573  * 16-bit stack layout, and with ebp and ebx pointing into the 16-bit
 574  * stack at the designated places:
 575  *
 576  *    ...
 577  *  (ebp+14) original arguments to the callback routine
 578  *  (ebp+10) far return address to original caller
 579  *  (ebp+6)  Thunklet target address
 580  *  (ebp+2)  Thunklet relay ID code
 581  *  (ebp)    BP (saved by CBClientGlueSL)
 582  *  (ebp-2)  SI (saved by CBClientGlueSL)
 583  *  (ebp-4)  DI (saved by CBClientGlueSL)
 584  *  (ebp-6)  DS (saved by CBClientGlueSL)
 585  *
 586  *   ...     buffer space used by the 16-bit side glue for temp copies
 587  *
 588  *  (ebx+4)  far return address to 16-bit side glue code
 589  *  (ebx)    saved 16-bit ss:sp (pointing to ebx+4)
 590  *
 591  * The 32-bit side glue code accesses both the original arguments (via ebp)
 592  * and the temporary copies prepared by the 16-bit side glue (via ebx).
 593  * After completion, the stub will load ss:sp from the buffer at ebx
 594  * and perform a far return to 16-bit code.
 595  *
 596  * To trick the relay stub into returning to us, we replace the 16-bit
 597  * return address to the glue code by a cs:ip pair pointing to our
 598  * return entry point (the original return address is saved first).
 599  * Our return stub thus called will then reload the 32-bit ss:esp and
 600  * return to 32-bit code (by using and ss:esp value that we have also
 601  * pushed onto the 16-bit stack before and a cs:eip values found at
 602  * that position on the 32-bit stack).  The ss:esp to be restored is
 603  * found relative to the 16-bit stack pointer at:
 604  *
 605  *  (ebx-4)   ss  (flat)
 606  *  (ebx-8)   sp  (32-bit stack pointer)
 607  *
 608  * The second variant of this routine, CALL32_CBClientEx, which is used
 609  * to implement KERNEL.621, has to cope with yet another problem: Here,
 610  * the 32-bit side directly returns to the caller of the CBClient thunklet,
 611  * restoring registers saved by CBClientGlueSL and cleaning up the stack.
 612  * As we have to return to our 32-bit code first, we have to adapt the
 613  * layout of our temporary area so as to include values for the registers
 614  * that are to be restored, and later (in the implementation of KERNEL.621)
 615  * we *really* restore them. The return stub restores DS, DI, SI, and BP
 616  * from the stack, skips the next 8 bytes (CBClient relay code / target),
 617  * and then performs a lret NN, where NN is the number of arguments to be
 618  * removed. Thus, we prepare our temporary area as follows:
 619  *
 620  *     (ebx+22) 16-bit cs  (this segment)
 621  *     (ebx+20) 16-bit ip  ('16-bit' return entry point)
 622  *     (ebx+16) 32-bit ss  (flat)
 623  *     (ebx+12) 32-bit sp  (32-bit stack pointer)
 624  *     (ebx+10) 16-bit bp  (points to ebx+24)
 625  *     (ebx+8)  16-bit si  (ignored)
 626  *     (ebx+6)  16-bit di  (ignored)
 627  *     (ebx+4)  16-bit ds  (we actually use the flat DS here)
 628  *     (ebx+2)  16-bit ss  (16-bit stack segment)
 629  *     (ebx+0)  16-bit sp  (points to ebx+4)
 630  *
 631  * Note that we ensure that DS is not changed and remains the flat segment,
 632  * and the 32-bit stack pointer our own return stub needs fits just
 633  * perfectly into the 8 bytes that are skipped by the Windows stub.
 634  * One problem is that we have to determine the number of removed arguments,
 635  * as these have to be really removed in KERNEL.621. Thus, the BP value
 636  * that we place in the temporary area to be restored, contains the value
 637  * that SP would have if no arguments were removed. By comparing the actual
 638  * value of SP with this value in our return stub we can compute the number
 639  * of removed arguments. This is then returned to KERNEL.621.
 640  *
 641  * The stack layout of this function:
 642  * (ebp+20)  nArgs     pointer to variable receiving nr. of args (Ex only)
 643  * (ebp+16)  esi       pointer to caller's esi value
 644  * (ebp+12)  arg       ebp value to be set for relay stub
 645  * (ebp+8)   func      CBClient relay stub address
 646  * (ebp+4)   ret addr
 647  * (ebp)     ebp
 648  */
 649 static void BuildCallTo32CBClient( FILE *outfile, BOOL isEx )
 650 {
 651     function_header( outfile, isEx ? "CALL32_CBClientEx" : "CALL32_CBClient" );
 652
 653     /* Entry code */
 654
 655     fprintf( outfile, "\tpushl %%ebp\n" );
 656     fprintf( outfile, "\tmovl %%esp,%%ebp\n" );
 657     fprintf( outfile, "\tpushl %%edi\n" );
 658     fprintf( outfile, "\tpushl %%esi\n" );
 659     fprintf( outfile, "\tpushl %%ebx\n" );
 660
 661     /* Get pointer to temporary area and save the 32-bit stack pointer */
 662
 663     fprintf( outfile, "\tmovl 16(%%ebp), %%ebx\n" );
 664     fprintf( outfile, "\tleal -8(%%esp), %%eax\n" );
 665
 666     if ( !isEx )
 667         fprintf( outfile, "\tmovl %%eax, -8(%%ebx)\n" );
 668     else
 669         fprintf( outfile, "\tmovl %%eax, 12(%%ebx)\n" );
 670
 671     /* Set up registers and call CBClient relay stub (simulating a far call) */
 672
 673     fprintf( outfile, "\tmovl 20(%%ebp), %%esi\n" );
 674     fprintf( outfile, "\tmovl (%%esi), %%esi\n" );
 675
 676     fprintf( outfile, "\tmovl 8(%%ebp), %%eax\n" );
 677     fprintf( outfile, "\tmovl 12(%%ebp), %%ebp\n" );
 678
 679     fprintf( outfile, "\tpushl %%cs\n" );
 680     fprintf( outfile, "\tcall *%%eax\n" );
 681
 682     /* Return new esi value to caller */
 683
 684     fprintf( outfile, "\tmovl 32(%%esp), %%edi\n" );
 685     fprintf( outfile, "\tmovl %%esi, (%%edi)\n" );
 686
 687     /* Return argument size to caller */
 688     if ( isEx )
 689     {
 690         fprintf( outfile, "\tmovl 36(%%esp), %%ebx\n" );
 691         fprintf( outfile, "\tmovl %%ebp, (%%ebx)\n" );
 692     }
 693
 694     /* Restore registers and return */
 695
 696     fprintf( outfile, "\tpopl %%ebx\n" );
 697     fprintf( outfile, "\tpopl %%esi\n" );
 698     fprintf( outfile, "\tpopl %%edi\n" );
 699     fprintf( outfile, "\tpopl %%ebp\n" );
 700     fprintf( outfile, "\tret\n" );
 701     output_function_size( outfile, isEx ? "CALL32_CBClientEx" : "CALL32_CBClient" );
 702
 703     /* '16-bit' return stub */
 704
 705     function_header( outfile, isEx ? "CALL32_CBClientEx_Ret" : "CALL32_CBClient_Ret" );
 706     if ( !isEx )
 707     {
 708         fprintf( outfile, "\tmovzwl %%sp, %%ebx\n" );
 709         fprintf( outfile, "\tlssl %%ss:-16(%%ebx), %%esp\n" );
 710     }
 711     else
 712     {
 713         fprintf( outfile, "\tmovzwl %%bp, %%ebx\n" );
 714         fprintf( outfile, "\tsubw %%bp, %%sp\n" );
 715         fprintf( outfile, "\tmovzwl %%sp, %%ebp\n" );
 716         fprintf( outfile, "\tlssl %%ss:-12(%%ebx), %%esp\n" );
 717     }
 718     fprintf( outfile, "\tlret\n" );
 719     output_function_size( outfile, isEx ? "CALL32_CBClientEx_Ret" : "CALL32_CBClient_Ret" );
 720 }
 721
 722
 723 /*******************************************************************
 724  *         BuildCallFrom32Regs
 725  *
 726  * Build a 32-bit-to-Wine call-back function for a 'register' function.
 727  * 'args' is the number of dword arguments.
 728  *
 729  * Stack layout:
 730  *   ...
 731  * (ebp+16)  first arg
 732  * (ebp+12)  ret addr to user code
 733  * (ebp+8)   eax saved by relay code
 734  * (ebp+4)   ret addr to relay code
 735  * (ebp+0)   saved ebp
 736  * (ebp-128) buffer area to allow stack frame manipulation
 737  * (ebp-332) CONTEXT86 struct
 738  * (ebp-336) padding for stack alignment
 739  * (ebp-336-n) CONTEXT86 *argument
 740  *  ....     other arguments copied from (ebp+12)
 741  *
 742  * The entry point routine is called with a CONTEXT* extra argument,
 743  * following the normal args. In this context structure, EIP_reg
 744  * contains the return address to user code, and ESP_reg the stack
 745  * pointer on return (with the return address and arguments already
 746  * removed).
 747  */
 748 static void BuildCallFrom32Regs( FILE *outfile )
 749 {
 750     static const int STACK_SPACE = 128 + sizeof(CONTEXT86);
 751
 752     /* Function header */
 753
 754     function_header( outfile, "__wine_call_from_32_regs" );
 755
 756     /* Allocate some buffer space on the stack */
 757
 758     fprintf( outfile, "\tpushl %%ebp\n" );
 759     fprintf( outfile, "\tmovl %%esp,%%ebp\n ");
 760     fprintf( outfile, "\tleal -%d(%%esp), %%esp\n", STACK_SPACE + 4 /* for context arg */);
 761
 762     /* Build the context structure */
 763
 764     fprintf( outfile, "\tpushfl\n" );
 765     fprintf( outfile, "\tpopl %%eax\n" );
 766     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(EFlags) - STACK_SPACE );
 767     fprintf( outfile, "\tmovl 0(%%ebp),%%eax\n" );
 768     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Ebp) - STACK_SPACE );
 769     fprintf( outfile, "\tmovl 8(%%ebp),%%eax\n" );
 770     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Eax) - STACK_SPACE );
 771     fprintf( outfile, "\tmovl %%ebx,%d(%%ebp)\n", CONTEXTOFFSET(Ebx) - STACK_SPACE );
 772     fprintf( outfile, "\tmovl %%ecx,%d(%%ebp)\n", CONTEXTOFFSET(Ecx) - STACK_SPACE );
 773     fprintf( outfile, "\tmovl %%edx,%d(%%ebp)\n", CONTEXTOFFSET(Edx) - STACK_SPACE );
 774     fprintf( outfile, "\tmovl %%esi,%d(%%ebp)\n", CONTEXTOFFSET(Esi) - STACK_SPACE );
 775     fprintf( outfile, "\tmovl %%edi,%d(%%ebp)\n", CONTEXTOFFSET(Edi) - STACK_SPACE );
 776
 777     fprintf( outfile, "\txorl %%eax,%%eax\n" );
 778     fprintf( outfile, "\tmovw %%cs,%%ax\n" );
 779     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegCs) - STACK_SPACE );
 780     fprintf( outfile, "\tmovw %%es,%%ax\n" );
 781     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegEs) - STACK_SPACE );
 782     fprintf( outfile, "\tmovw %%fs,%%ax\n" );
 783     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegFs) - STACK_SPACE );
 784     fprintf( outfile, "\tmovw %%gs,%%ax\n" );
 785     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegGs) - STACK_SPACE );
 786     fprintf( outfile, "\tmovw %%ss,%%ax\n" );
 787     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegSs) - STACK_SPACE );
 788     fprintf( outfile, "\tmovw %%ds,%%ax\n" );
 789     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegDs) - STACK_SPACE );
 790     fprintf( outfile, "\tmovw %%ax,%%es\n" );  /* set %es equal to %ds just in case */
 791
 792     fprintf( outfile, "\tmovl $0x%x,%%eax\n", CONTEXT86_FULL );
 793     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(ContextFlags) - STACK_SPACE );
 794
 795     fprintf( outfile, "\tmovl 12(%%ebp),%%eax\n" ); /* Get %eip at time of call */
 796     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Eip) - STACK_SPACE );
 797
 798     /* Transfer the arguments */
 799
 800     fprintf( outfile, "\tmovl 4(%%ebp),%%ebx\n" );   /* get relay code addr */
 801     fprintf( outfile, "\tmovzbl 4(%%ebx),%%ecx\n" ); /* fetch number of args to copy */
 802     fprintf( outfile, "\tsubl %%ecx,%%esp\n" );
 803     fprintf( outfile, "\tandl $~15,%%esp\n" );
 804     fprintf( outfile, "\tleal 16(%%ebp),%%esi\n" );  /* get %esp at time of call */
 805     fprintf( outfile, "\tmovl %%esp,%%edi\n" );
 806     fprintf( outfile, "\tshrl $2,%%ecx\n" );
 807     fprintf( outfile, "\tjz 1f\n" );
 808     fprintf( outfile, "\tcld\n" );
 809     fprintf( outfile, "\trep\n\tmovsl\n" );  /* copy args */
 810     fprintf( outfile, "1:\tleal %d(%%ebp),%%eax\n", -STACK_SPACE );  /* get addr of context struct */
 811     fprintf( outfile, "\tmovl %%eax,(%%edi)\n" );    /* and pass it as extra arg */
 812     fprintf( outfile, "\tmovzbl 5(%%ebx),%%eax\n" ); /* fetch number of args to remove */
 813     fprintf( outfile, "\tleal 16(%%ebp,%%eax),%%eax\n" );
 814     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Esp) - STACK_SPACE );
 815
 816     /* Call the entry point */
 817
 818     fprintf( outfile, "\taddl (%%ebx),%%ebx\n" );
 819     fprintf( outfile, "\tcall *%%ebx\n" );
 820     fprintf( outfile, "\tleal -%d(%%ebp),%%ecx\n", STACK_SPACE );
 821
 822     /* Restore the context structure */
 823
 824     fprintf( outfile, "2:\tpushl %d(%%ecx)\n", CONTEXTOFFSET(SegEs) );
 825     fprintf( outfile, "\tpopl %%es\n" );
 826     fprintf( outfile, "\tpushl %d(%%ecx)\n", CONTEXTOFFSET(SegFs) );
 827     fprintf( outfile, "\tpopl %%fs\n" );
 828     fprintf( outfile, "\tpushl %d(%%ecx)\n", CONTEXTOFFSET(SegGs) );
 829     fprintf( outfile, "\tpopl %%gs\n" );
 830
 831     fprintf( outfile, "\tmovl %d(%%ecx),%%edi\n", CONTEXTOFFSET(Edi) );
 832     fprintf( outfile, "\tmovl %d(%%ecx),%%esi\n", CONTEXTOFFSET(Esi) );
 833     fprintf( outfile, "\tmovl %d(%%ecx),%%edx\n", CONTEXTOFFSET(Edx) );
 834     fprintf( outfile, "\tmovl %d(%%ecx),%%ebx\n", CONTEXTOFFSET(Ebx) );
 835     fprintf( outfile, "\tmovl %d(%%ecx),%%eax\n", CONTEXTOFFSET(Eax) );
 836     fprintf( outfile, "\tmovl %d(%%ecx),%%ebp\n", CONTEXTOFFSET(Ebp) );
 837
 838     fprintf( outfile, "\tpushl %d(%%ecx)\n", CONTEXTOFFSET(SegSs) );
 839     fprintf( outfile, "\tpopl %%ss\n" );
 840     fprintf( outfile, "\tmovl %d(%%ecx),%%esp\n", CONTEXTOFFSET(Esp) );
 841
 842     fprintf( outfile, "\tpushl %d(%%ecx)\n", CONTEXTOFFSET(EFlags) );
 843     fprintf( outfile, "\tpushl %d(%%ecx)\n", CONTEXTOFFSET(SegCs) );
 844     fprintf( outfile, "\tpushl %d(%%ecx)\n", CONTEXTOFFSET(Eip) );
 845     fprintf( outfile, "\tpushl %d(%%ecx)\n", CONTEXTOFFSET(SegDs) );
 846     fprintf( outfile, "\tmovl %d(%%ecx),%%ecx\n", CONTEXTOFFSET(Ecx) );
 847
 848     fprintf( outfile, "\tpopl %%ds\n" );
 849     fprintf( outfile, "\tiret\n" );
 850     output_function_size( outfile, "__wine_call_from_32_regs" );
 851
 852     function_header( outfile, "__wine_call_from_32_restore_regs" );
 853     fprintf( outfile, "\tmovl 4(%%esp),%%ecx\n" );
 854     fprintf( outfile, "\tjmp 2b\n" );
 855     output_function_size( outfile, "__wine_call_from_32_restore_regs" );
 856 }
 857
 858
 859 /*******************************************************************
 860  *         BuildPendingEventCheck
 861  *
 862  * Build a function that checks whether there are any
 863  * pending DPMI events.
 864  *
 865  * Stack layout:
 866  *
 867  * (sp+12) long   eflags
 868  * (sp+6)  long   cs
 869  * (sp+2)  long   ip
 870  * (sp)    word   fs
 871  *
 872  * On entry to function, fs register points to a valid TEB.
 873  * On exit from function, stack will be popped.
 874  */
 875 static void BuildPendingEventCheck( FILE *outfile )
 876 {
 877     /* Function header */
 878
 879     function_header( outfile, "DPMI_PendingEventCheck" );
 880
 881     /* Check for pending events. */
 882
 883     fprintf( outfile, "\t.byte 0x64\n\ttestl $0xffffffff,(%d)\n",
 884              STRUCTOFFSET(TEB,vm86_pending) );
 885     fprintf( outfile, "\tje %s\n", asm_name("DPMI_PendingEventCheck_Cleanup") );
 886
 887     fprintf( outfile, "\t.byte 0x64\n\ttestl $0xffffffff,(%d)\n",
 888              STRUCTOFFSET(TEB,dpmi_vif) );
 889
 890     fprintf( outfile, "\tje %s\n", asm_name("DPMI_PendingEventCheck_Cleanup") );
 891
 892     /* Process pending events. */
 893
 894     fprintf( outfile, "\tsti\n" );
 895
 896     /* Start cleanup. Restore fs register. */
 897
 898     fprintf( outfile, "%s\n", asm_globl("DPMI_PendingEventCheck_Cleanup") );
 899     fprintf( outfile, "\tpopw %%fs\n" );
 900
 901     /* Return from function. */
 902
 903     fprintf( outfile, "%s\n", asm_globl("DPMI_PendingEventCheck_Return") );
 904     fprintf( outfile, "\tiret\n" );
 905
 906     output_function_size( outfile, "DPMI_PendingEventCheck" );
 907 }
 908
 909
 910 /*******************************************************************
 911  *         BuildRelays16
 912  *
 913  * Build all the 16-bit relay callbacks
 914  */
 915 void BuildRelays16( FILE *outfile )
 916 {
 917     if (target_cpu != CPU_x86)
 918     {
 919         fprintf( outfile, "/* File not used with this architecture. Do not edit! */\n\n" );
 920         return;
 921     }
 922
 923     /* File header */
 924
 925     fprintf( outfile, "/* File generated automatically. Do not edit! */\n\n" );
 926     fprintf( outfile, "\t.text\n" );
 927
 928     fprintf( outfile, "%s:\n\n", asm_name("__wine_spec_thunk_text_16") );
 929
 930     fprintf( outfile, "%s\n", asm_globl("__wine_call16_start") );
 931
 932     /* Standard CallFrom16 routine */
 933     BuildCallFrom16Core( outfile, FALSE, FALSE );
 934
 935     /* Register CallFrom16 routine */
 936     BuildCallFrom16Core( outfile, TRUE, FALSE );
 937
 938     /* C16ThkSL CallFrom16 routine */
 939     BuildCallFrom16Core( outfile, FALSE, TRUE );
 940
 941     /* Standard CallTo16 routine */
 942     BuildCallTo16Core( outfile, 0 );
 943
 944     /* Register CallTo16 routine */
 945     BuildCallTo16Core( outfile, 1 );
 946
 947     /* Standard CallTo16 return stub */
 948     BuildRet16Func( outfile );
 949
 950     /* CBClientThunkSL routine */
 951     BuildCallTo32CBClient( outfile, FALSE );
 952
 953     /* CBClientThunkSLEx routine */
 954     BuildCallTo32CBClient( outfile, TRUE  );
 955
 956     /* Pending DPMI events check stub */
 957     BuildPendingEventCheck( outfile );
 958
 959     fprintf( outfile, "%s\n", asm_globl("__wine_call16_end") );
 960     output_function_size( outfile, "__wine_spec_thunk_text_16" );
 961
 962     /* Declare the return address and data selector variables */
 963     fprintf( outfile, "\n\t.data\n\t.align %d\n", get_alignment(4) );
 964     fprintf( outfile, "%s\n\t.long 0\n", asm_globl("CallTo16_DataSelector") );
 965     fprintf( outfile, "%s\n\t.long 0\n", asm_globl("CallTo16_TebSelector") );
 966     if (UsePIC) fprintf( outfile, "wine_ldt_copy_ptr:\t.long %s\n", asm_name("wine_ldt_copy") );
 967 }
 968
 969 /*******************************************************************
 970  *         BuildRelays32
 971  *
 972  * Build all the 32-bit relay callbacks
 973  */
 974 void BuildRelays32( FILE *outfile )
 975 {
 976     if (target_cpu != CPU_x86)
 977     {
 978         fprintf( outfile, "/* File not used with this architecture. Do not edit! */\n\n" );
 979         return;
 980     }
 981
 982     /* File header */
 983
 984     fprintf( outfile, "/* File generated automatically. Do not edit! */\n\n" );
 985     fprintf( outfile, "\t.text\n" );
 986     fprintf( outfile, "%s:\n\n", asm_name("__wine_spec_thunk_text_32") );
 987
 988     /* 32-bit register entry point */
 989     BuildCallFrom32Regs( outfile );
 990
 991     output_function_size( outfile, "__wine_spec_thunk_text_32" );
 992 }