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, "\t.globl %s\n", asm_name(name) );
  40     fprintf( outfile, "%s:\n", asm_name(name) );
  41 }
  42
  43
  44 static void function_footer( FILE *outfile, const char *name )
  45 {
  46     const char *size = func_size( name );
  47     if (size[0]) fprintf( outfile, "\t%s\n", size );
  48 }
  49
  50 static inline const char *data16_prefix(void)
  51 {
  52     return (target_platform == PLATFORM_SVR4) ? "\tdata16\n" : "";
  53 }
  54
  55 /*******************************************************************
  56  *         BuildCallFrom16Core
  57  *
  58  * This routine builds the core routines used in 16->32 thunks:
  59  * CallFrom16Word, CallFrom16Long, CallFrom16Register, and CallFrom16Thunk.
  60  *
  61  * These routines are intended to be called via a far call (with 32-bit
  62  * operand size) from 16-bit code.  The 16-bit code stub must push %bp,
  63  * the 32-bit entry point to be called, and the argument conversion
  64  * routine to be used (see stack layout below).
  65  *
  66  * The core routine completes the STACK16FRAME on the 16-bit stack and
  67  * switches to the 32-bit stack.  Then, the argument conversion routine
  68  * is called; it gets passed the 32-bit entry point and a pointer to the
  69  * 16-bit arguments (on the 16-bit stack) as parameters. (You can either
  70  * use conversion routines automatically generated by BuildCallFrom16,
  71  * or write your own for special purposes.)
  72  *
  73  * The conversion routine must call the 32-bit entry point, passing it
  74  * the converted arguments, and return its return value to the core.
  75  * After the conversion routine has returned, the core switches back
  76  * to the 16-bit stack, converts the return value to the DX:AX format
  77  * (CallFrom16Long), and returns to the 16-bit call stub.  All parameters,
  78  * including %bp, are popped off the stack.
  79  *
  80  * The 16-bit call stub now returns to the caller, popping the 16-bit
  81  * arguments if necessary (pascal calling convention).
  82  *
  83  * In the case of a 'register' function, CallFrom16Register fills a
  84  * CONTEXT86 structure with the values all registers had at the point
  85  * the first instruction of the 16-bit call stub was about to be
  86  * executed.  A pointer to this CONTEXT86 is passed as third parameter
  87  * to the argument conversion routine, which typically passes it on
  88  * to the called 32-bit entry point.
  89  *
  90  * CallFrom16Thunk is a special variant used by the implementation of
  91  * the Win95 16->32 thunk functions C16ThkSL and C16ThkSL01 and is
  92  * implemented as follows:
  93  * On entry, the EBX register is set up to contain a flat pointer to the
  94  * 16-bit stack such that EBX+22 points to the first argument.
  95  * Then, the entry point is called, while EBP is set up to point
  96  * to the return address (on the 32-bit stack).
  97  * The called function returns with CX set to the number of bytes
  98  * to be popped of the caller's stack.
  99  *
 100  * Stack layout upon entry to the core routine (STACK16FRAME):
 101  *  ...           ...
 102  * (sp+24) word   first 16-bit arg
 103  * (sp+22) word   cs
 104  * (sp+20) word   ip
 105  * (sp+18) word   bp
 106  * (sp+14) long   32-bit entry point (reused for Win16 mutex recursion count)
 107  * (sp+12) word   ip of actual entry point (necessary for relay debugging)
 108  * (sp+8)  long   relay (argument conversion) function entry point
 109  * (sp+4)  long   cs of 16-bit entry point
 110  * (sp)    long   ip of 16-bit entry point
 111  *
 112  * Added on the stack:
 113  * (sp-2)  word   saved gs
 114  * (sp-4)  word   saved fs
 115  * (sp-6)  word   saved es
 116  * (sp-8)  word   saved ds
 117  * (sp-12) long   saved ebp
 118  * (sp-16) long   saved ecx
 119  * (sp-20) long   saved edx
 120  * (sp-24) long   saved previous stack
 121  */
 122 static void BuildCallFrom16Core( FILE *outfile, int reg_func, int thunk, int short_ret )
 123 {
 124     const char *name = thunk? "thunk" : reg_func? "regs" : short_ret? "word" : "long";
 125
 126     /* Function header */
 127     if (thunk) function_header( outfile, "__wine_call_from_16_thunk" );
 128     else if (reg_func) function_header( outfile, "__wine_call_from_16_regs" );
 129     else if (short_ret) function_header( outfile, "__wine_call_from_16_word" );
 130     else function_header( outfile, "__wine_call_from_16_long" );
 131
 132     /* Create STACK16FRAME (except STACK32FRAME link) */
 133     fprintf( outfile, "\tpushw %%gs\n" );
 134     fprintf( outfile, "\tpushw %%fs\n" );
 135     fprintf( outfile, "\tpushw %%es\n" );
 136     fprintf( outfile, "\tpushw %%ds\n" );
 137     fprintf( outfile, "\tpushl %%ebp\n" );
 138     fprintf( outfile, "\tpushl %%ecx\n" );
 139     fprintf( outfile, "\tpushl %%edx\n" );
 140
 141     /* Save original EFlags register */
 142     if (reg_func) fprintf( outfile, "\tpushfl\n" );
 143
 144     if ( UsePIC )
 145     {
 146         fprintf( outfile, "\tcall .Lcall_from_16_%s.getpc\n", name );
 147         fprintf( outfile, ".Lcall_from_16_%s.getpc:\n", name );
 148         fprintf( outfile, "\tpopl %%ecx\n" );
 149         fprintf( outfile, "\t.byte 0x2e\n\tmovl %s-.Lcall_from_16_%s.getpc(%%ecx),%%edx\n",
 150                  asm_name("CallTo16_DataSelector"), name );
 151     }
 152     else
 153         fprintf( outfile, "\t.byte 0x2e\n\tmovl %s,%%edx\n", asm_name("CallTo16_DataSelector") );
 154
 155     /* Load 32-bit segment registers */
 156     fprintf( outfile, "%s\tmovw %%dx, %%ds\n", data16_prefix() );
 157     fprintf( outfile, "%s\tmovw %%dx, %%es\n", data16_prefix() );
 158
 159     if ( UsePIC )
 160         fprintf( outfile, "\tmovw %s-.Lcall_from_16_%s.getpc(%%ecx), %%fs\n",
 161                  asm_name("CallTo16_TebSelector"), name );
 162     else
 163         fprintf( outfile, "\tmovw %s, %%fs\n", asm_name("CallTo16_TebSelector") );
 164
 165     fprintf( outfile, "\t.byte 0x64\n\tmov (%d),%%gs\n", STRUCTOFFSET(TEB,gs_sel) );
 166
 167     /* Translate STACK16FRAME base to flat offset in %edx */
 168     fprintf( outfile, "\tmovw %%ss, %%dx\n" );
 169     fprintf( outfile, "\tandl $0xfff8, %%edx\n" );
 170     fprintf( outfile, "\tshrl $1, %%edx\n" );
 171     if (UsePIC)
 172     {
 173         fprintf( outfile, "\taddl wine_ldt_copy_ptr-.Lcall_from_16_%s.getpc(%%ecx),%%edx\n", name );
 174         fprintf( outfile, "\tmovl (%%edx), %%edx\n" );
 175     }
 176     else
 177         fprintf( outfile, "\tmovl %s(%%edx), %%edx\n", asm_name("wine_ldt_copy") );
 178     fprintf( outfile, "\tmovzwl %%sp, %%ebp\n" );
 179     fprintf( outfile, "\tleal %d(%%ebp,%%edx), %%edx\n", reg_func ? 0 : -4 );
 180
 181     /* Get saved flags into %ecx */
 182     if (reg_func) fprintf( outfile, "\tpopl %%ecx\n" );
 183
 184     /* Get the 32-bit stack pointer from the TEB and complete STACK16FRAME */
 185     fprintf( outfile, "\t.byte 0x64\n\tmovl (%d), %%ebp\n", STACKOFFSET );
 186     fprintf( outfile, "\tpushl %%ebp\n" );
 187
 188     /* Switch stacks */
 189     fprintf( outfile, "%s\t.byte 0x64\n\tmovw %%ss, (%d)\n", data16_prefix(), STACKOFFSET + 2 );
 190     fprintf( outfile, "\t.byte 0x64\n\tmovw %%sp, (%d)\n", STACKOFFSET );
 191     fprintf( outfile, "\tpushl %%ds\n" );
 192     fprintf( outfile, "\tpopl %%ss\n" );
 193     fprintf( outfile, "\tmovl %%ebp, %%esp\n" );
 194     fprintf( outfile, "\taddl $%d, %%ebp\n", STRUCTOFFSET(STACK32FRAME, 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         fprintf( outfile, "\tleal %d(%%edx), %%ebx\n", sizeof(STACK16FRAME)-22 );
 212         fprintf( outfile, "\tleal -4(%%esp), %%ebp\n" );
 213
 214         fprintf( outfile, "\tcall *%d(%%edx)\n", STACK16OFFSET(entry_point) );
 215
 216         /* Switch stack back */
 217         fprintf( outfile, "\t.byte 0x64\n\tmovw (%d), %%ss\n", STACKOFFSET+2 );
 218         fprintf( outfile, "\t.byte 0x64\n\tmovzwl (%d), %%esp\n", STACKOFFSET );
 219         fprintf( outfile, "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
 220
 221         /* Restore registers and return directly to caller */
 222         fprintf( outfile, "\taddl $8, %%esp\n" );
 223         fprintf( outfile, "\tpopl %%ebp\n" );
 224         fprintf( outfile, "\tpopw %%ds\n" );
 225         fprintf( outfile, "\tpopw %%es\n" );
 226         fprintf( outfile, "\tpopw %%fs\n" );
 227         fprintf( outfile, "\tpopw %%gs\n" );
 228         fprintf( outfile, "\taddl $20, %%esp\n" );
 229
 230         fprintf( outfile, "\txorb %%ch, %%ch\n" );
 231         fprintf( outfile, "\tpopl %%ebx\n" );
 232         fprintf( outfile, "\taddw %%cx, %%sp\n" );
 233         fprintf( outfile, "\tpush %%ebx\n" );
 234
 235         fprintf( outfile, "\t.byte 0x66\n" );
 236         fprintf( outfile, "\tlret\n" );
 237
 238         return;
 239     }
 240
 241
 242     /* Build register CONTEXT */
 243     if ( reg_func )
 244     {
 245         fprintf( outfile, "\tsubl $%d, %%esp\n", sizeof(CONTEXT86) );
 246
 247         fprintf( outfile, "\tmovl %%ecx, %d(%%esp)\n", CONTEXTOFFSET(EFlags) );
 248
 249         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Eax) );
 250         fprintf( outfile, "\tmovl %%ebx, %d(%%esp)\n", CONTEXTOFFSET(Ebx) );
 251         fprintf( outfile, "\tmovl %%esi, %d(%%esp)\n", CONTEXTOFFSET(Esi) );
 252         fprintf( outfile, "\tmovl %%edi, %d(%%esp)\n", CONTEXTOFFSET(Edi) );
 253
 254         fprintf( outfile, "\tmovl %d(%%edx), %%eax\n", STACK16OFFSET(ebp) );
 255         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Ebp) );
 256         fprintf( outfile, "\tmovl %d(%%edx), %%eax\n", STACK16OFFSET(ecx) );
 257         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Ecx) );
 258         fprintf( outfile, "\tmovl %d(%%edx), %%eax\n", STACK16OFFSET(edx) );
 259         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Edx) );
 260
 261         fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(ds) );
 262         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegDs) );
 263         fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(es) );
 264         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegEs) );
 265         fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(fs) );
 266         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegFs) );
 267         fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(gs) );
 268         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegGs) );
 269
 270         fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(cs) );
 271         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegCs) );
 272         fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(ip) );
 273         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Eip) );
 274
 275         fprintf( outfile, "\t.byte 0x64\n\tmovzwl (%d), %%eax\n", STACKOFFSET+2 );
 276         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegSs) );
 277         fprintf( outfile, "\t.byte 0x64\n\tmovzwl (%d), %%eax\n", STACKOFFSET );
 278         fprintf( outfile, "\taddl $%d, %%eax\n", STACK16OFFSET(ip) );
 279         fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Esp) );
 280 #if 0
 281         fprintf( outfile, "\tfsave %d(%%esp)\n", CONTEXTOFFSET(FloatSave) );
 282 #endif
 283
 284         /* Push address of CONTEXT86 structure -- popped by the relay routine */
 285         fprintf( outfile, "\tpushl %%esp\n" );
 286     }
 287
 288     /* Call relay routine (which will call the API entry point) */
 289     fprintf( outfile, "\tleal %d(%%edx), %%eax\n", sizeof(STACK16FRAME) );
 290     fprintf( outfile, "\tpushl %%eax\n" );
 291     fprintf( outfile, "\tpushl %d(%%edx)\n", STACK16OFFSET(entry_point) );
 292     fprintf( outfile, "\tcall *%d(%%edx)\n", STACK16OFFSET(relay) );
 293
 294     if ( reg_func )
 295     {
 296         fprintf( outfile, "\tleal -%d(%%ebp), %%ebx\n",
 297                  sizeof(CONTEXT) + STRUCTOFFSET(STACK32FRAME, ebp) );
 298
 299         /* Switch stack back */
 300         fprintf( outfile, "\t.byte 0x64\n\tmovw (%d), %%ss\n", STACKOFFSET+2 );
 301         fprintf( outfile, "\t.byte 0x64\n\tmovzwl (%d), %%esp\n", STACKOFFSET );
 302         fprintf( outfile, "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
 303
 304         /* Get return address to CallFrom16 stub */
 305         fprintf( outfile, "\taddw $%d, %%sp\n", STACK16OFFSET(callfrom_ip)-4 );
 306         fprintf( outfile, "\tpopl %%eax\n" );
 307         fprintf( outfile, "\tpopl %%edx\n" );
 308
 309         /* Restore all registers from CONTEXT */
 310         fprintf( outfile, "\tmovw %d(%%ebx), %%ss\n", CONTEXTOFFSET(SegSs) );
 311         fprintf( outfile, "\tmovl %d(%%ebx), %%esp\n", CONTEXTOFFSET(Esp) );
 312         fprintf( outfile, "\taddl $4, %%esp\n" );  /* room for final return address */
 313
 314         fprintf( outfile, "\tpushw %d(%%ebx)\n", CONTEXTOFFSET(SegCs) );
 315         fprintf( outfile, "\tpushw %d(%%ebx)\n", CONTEXTOFFSET(Eip) );
 316         fprintf( outfile, "\tpushl %%edx\n" );
 317         fprintf( outfile, "\tpushl %%eax\n" );
 318         fprintf( outfile, "\tpushl %d(%%ebx)\n", CONTEXTOFFSET(EFlags) );
 319         fprintf( outfile, "\tpushl %d(%%ebx)\n", CONTEXTOFFSET(SegDs) );
 320
 321         fprintf( outfile, "\tpushl %d(%%ebx)\n", CONTEXTOFFSET(SegEs) );
 322         fprintf( outfile, "\tpopl %%es\n" );
 323         fprintf( outfile, "\tpushl %d(%%ebx)\n", CONTEXTOFFSET(SegFs) );
 324         fprintf( outfile, "\tpopl %%fs\n" );
 325         fprintf( outfile, "\tpushl %d(%%ebx)\n", CONTEXTOFFSET(SegGs) );
 326         fprintf( outfile, "\tpopl %%gs\n" );
 327
 328         fprintf( outfile, "\tmovl %d(%%ebx), %%ebp\n", CONTEXTOFFSET(Ebp) );
 329         fprintf( outfile, "\tmovl %d(%%ebx), %%esi\n", CONTEXTOFFSET(Esi) );
 330         fprintf( outfile, "\tmovl %d(%%ebx), %%edi\n", CONTEXTOFFSET(Edi) );
 331         fprintf( outfile, "\tmovl %d(%%ebx), %%eax\n", CONTEXTOFFSET(Eax) );
 332         fprintf( outfile, "\tmovl %d(%%ebx), %%edx\n", CONTEXTOFFSET(Edx) );
 333         fprintf( outfile, "\tmovl %d(%%ebx), %%ecx\n", CONTEXTOFFSET(Ecx) );
 334         fprintf( outfile, "\tmovl %d(%%ebx), %%ebx\n", CONTEXTOFFSET(Ebx) );
 335
 336         fprintf( outfile, "\tpopl %%ds\n" );
 337         fprintf( outfile, "\tpopfl\n" );
 338         fprintf( outfile, "\tlret\n" );
 339     }
 340     else
 341     {
 342         /* Switch stack back */
 343         fprintf( outfile, "\t.byte 0x64\n\tmovw (%d), %%ss\n", STACKOFFSET+2 );
 344         fprintf( outfile, "\t.byte 0x64\n\tmovzwl (%d), %%esp\n", STACKOFFSET );
 345         fprintf( outfile, "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
 346
 347         /* Restore registers */
 348         fprintf( outfile, "\tpopl %%edx\n" );
 349         fprintf( outfile, "\tpopl %%ecx\n" );
 350         fprintf( outfile, "\tpopl %%ebp\n" );
 351         fprintf( outfile, "\tpopw %%ds\n" );
 352         fprintf( outfile, "\tpopw %%es\n" );
 353         fprintf( outfile, "\tpopw %%fs\n" );
 354         fprintf( outfile, "\tpopw %%gs\n" );
 355
 356         /* Prepare return value and set flags accordingly */
 357         if ( !short_ret )
 358             fprintf( outfile, "\tshldl $16, %%eax, %%edx\n" );
 359         fprintf( outfile, "\torl %%eax, %%eax\n" );
 360
 361         /* Return to return stub which will return to caller */
 362         fprintf( outfile, "\tlret $12\n" );
 363     }
 364     if (thunk) function_footer( outfile, "__wine_call_from_16_thunk" );
 365     else if (reg_func) function_footer( outfile, "__wine_call_from_16_regs" );
 366     else if (short_ret) function_footer( outfile, "__wine_call_from_16_word" );
 367     else function_footer( outfile, "__wine_call_from_16_long" );
 368 }
 369
 370
 371 /*******************************************************************
 372  *         BuildCallTo16Core
 373  *
 374  * This routine builds the core routines used in 32->16 thunks:
 375  *
 376  * extern DWORD WINAPI wine_call_to_16( FARPROC16 target, DWORD cbArgs, PEXCEPTION_HANDLER handler );
 377  * extern void WINAPI wine_call_to_16_regs( CONTEXT86 *context, DWORD cbArgs, PEXCEPTION_HANDLER handler );
 378  *
 379  * These routines can be called directly from 32-bit code.
 380  *
 381  * All routines expect that the 16-bit stack contents (arguments) and the
 382  * return address (segptr to CallTo16_Ret) were already set up by the
 383  * caller; nb_args must contain the number of bytes to be conserved.  The
 384  * 16-bit SS:SP will be set accordinly.
 385  *
 386  * All other registers are either taken from the CONTEXT86 structure
 387  * or else set to default values.  The target routine address is either
 388  * given directly or taken from the CONTEXT86.
 389  */
 390 static void BuildCallTo16Core( FILE *outfile, int reg_func )
 391 {
 392     const char *name = reg_func ? "wine_call_to_16_regs" : "wine_call_to_16";
 393
 394     /* Function header */
 395     function_header( outfile, name );
 396
 397     /* Function entry sequence */
 398     fprintf( outfile, "\tpushl %%ebp\n" );
 399     fprintf( outfile, "\tmovl %%esp, %%ebp\n" );
 400
 401     /* Save the 32-bit registers */
 402     fprintf( outfile, "\tpushl %%ebx\n" );
 403     fprintf( outfile, "\tpushl %%esi\n" );
 404     fprintf( outfile, "\tpushl %%edi\n" );
 405     fprintf( outfile, "\t.byte 0x64\n\tmov %%gs,(%d)\n", STRUCTOFFSET(TEB,gs_sel) );
 406
 407     /* Setup exception frame */
 408     fprintf( outfile, "\t.byte 0x64\n\tpushl (%d)\n", STACKOFFSET );
 409     fprintf( outfile, "\tpushl 16(%%ebp)\n" ); /* handler */
 410     fprintf( outfile, "\t.byte 0x64\n\tpushl (%d)\n", STRUCTOFFSET(TEB,Tib.ExceptionList) );
 411     fprintf( outfile, "\t.byte 0x64\n\tmovl %%esp,(%d)\n", STRUCTOFFSET(TEB,Tib.ExceptionList) );
 412
 413     /* Call the actual CallTo16 routine (simulate a lcall) */
 414     fprintf( outfile, "\tpushl %%cs\n" );
 415     fprintf( outfile, "\tcall .L%s\n", name );
 416
 417     /* Remove exception frame */
 418     fprintf( outfile, "\t.byte 0x64\n\tpopl (%d)\n", STRUCTOFFSET(TEB,Tib.ExceptionList) );
 419     fprintf( outfile, "\taddl $4, %%esp\n" );
 420     fprintf( outfile, "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
 421
 422     if ( !reg_func )
 423     {
 424         /* Convert return value */
 425         fprintf( outfile, "\tandl $0xffff,%%eax\n" );
 426         fprintf( outfile, "\tshll $16,%%edx\n" );
 427         fprintf( outfile, "\torl %%edx,%%eax\n" );
 428     }
 429     else
 430     {
 431         /*
 432          * Modify CONTEXT86 structure to contain new values
 433          *
 434          * NOTE:  We restore only EAX, EBX, EDX, EDX, EBP, and ESP.
 435          *        The segment registers as well as ESI and EDI should
 436          *        not be modified by a well-behaved 16-bit routine in
 437          *        any case.  [If necessary, we could restore them as well,
 438          *        at the cost of a somewhat less efficient return path.]
 439          */
 440
 441         fprintf( outfile, "\tmovl %d(%%esp), %%edi\n", STACK32OFFSET(target) - STACK32OFFSET(edi));
 442                 /* everything above edi has been popped already */
 443
 444         fprintf( outfile, "\tmovl %%eax, %d(%%edi)\n", CONTEXTOFFSET(Eax) );
 445         fprintf( outfile, "\tmovl %%ebx, %d(%%edi)\n", CONTEXTOFFSET(Ebx) );
 446         fprintf( outfile, "\tmovl %%ecx, %d(%%edi)\n", CONTEXTOFFSET(Ecx) );
 447         fprintf( outfile, "\tmovl %%edx, %d(%%edi)\n", CONTEXTOFFSET(Edx) );
 448         fprintf( outfile, "\tmovl %%ebp, %d(%%edi)\n", CONTEXTOFFSET(Ebp) );
 449         fprintf( outfile, "\tmovl %%esi, %d(%%edi)\n", CONTEXTOFFSET(Esp) );
 450                  /* The return glue code saved %esp into %esi */
 451     }
 452
 453     /* Restore the 32-bit registers */
 454     fprintf( outfile, "\tpopl %%edi\n" );
 455     fprintf( outfile, "\tpopl %%esi\n" );
 456     fprintf( outfile, "\tpopl %%ebx\n" );
 457
 458     /* Function exit sequence */
 459     fprintf( outfile, "\tpopl %%ebp\n" );
 460     fprintf( outfile, "\tret $12\n" );
 461
 462
 463     /* Start of the actual CallTo16 routine */
 464
 465     fprintf( outfile, ".L%s:\n", name );
 466
 467     /* Switch to the 16-bit stack */
 468     fprintf( outfile, "\tmovl %%esp,%%edx\n" );
 469     fprintf( outfile, "%s\t.byte 0x64\n\tmovw (%d),%%ss\n", data16_prefix(), STACKOFFSET + 2);
 470     fprintf( outfile, "\t.byte 0x64\n\tmovw (%d),%%sp\n", STACKOFFSET );
 471     fprintf( outfile, "\t.byte 0x64\n\tmovl %%edx,(%d)\n", STACKOFFSET );
 472
 473     /* Make %bp point to the previous stackframe (built by CallFrom16) */
 474     fprintf( outfile, "\tmovzwl %%sp,%%ebp\n" );
 475     fprintf( outfile, "\tleal %d(%%ebp),%%ebp\n", STACK16OFFSET(bp) );
 476
 477     /* Add the specified offset to the new sp */
 478     fprintf( outfile, "\tsubw %d(%%edx), %%sp\n", STACK32OFFSET(nb_args) );
 479
 480     if (reg_func)
 481     {
 482         /* Push the called routine address */
 483         fprintf( outfile, "\tmovl %d(%%edx),%%edx\n", STACK32OFFSET(target) );
 484         fprintf( outfile, "\tpushw %d(%%edx)\n", CONTEXTOFFSET(SegCs) );
 485         fprintf( outfile, "\tpushw %d(%%edx)\n", CONTEXTOFFSET(Eip) );
 486
 487         /* Get the registers */
 488         fprintf( outfile, "\tpushw %d(%%edx)\n", CONTEXTOFFSET(SegDs) );
 489         fprintf( outfile, "\tpushl %d(%%edx)\n", CONTEXTOFFSET(SegEs) );
 490         fprintf( outfile, "\tpopl %%es\n" );
 491         fprintf( outfile, "\tpushl %d(%%edx)\n", CONTEXTOFFSET(SegFs) );
 492         fprintf( outfile, "\tpopl %%fs\n" );
 493         fprintf( outfile, "\tpushl %d(%%edx)\n", CONTEXTOFFSET(SegGs) );
 494         fprintf( outfile, "\tpopl %%gs\n" );
 495         fprintf( outfile, "\tmovl %d(%%edx),%%ebp\n", CONTEXTOFFSET(Ebp) );
 496         fprintf( outfile, "\tmovl %d(%%edx),%%esi\n", CONTEXTOFFSET(Esi) );
 497         fprintf( outfile, "\tmovl %d(%%edx),%%edi\n", CONTEXTOFFSET(Edi) );
 498         fprintf( outfile, "\tmovl %d(%%edx),%%eax\n", CONTEXTOFFSET(Eax) );
 499         fprintf( outfile, "\tmovl %d(%%edx),%%ebx\n", CONTEXTOFFSET(Ebx) );
 500         fprintf( outfile, "\tmovl %d(%%edx),%%ecx\n", CONTEXTOFFSET(Ecx) );
 501         fprintf( outfile, "\tmovl %d(%%edx),%%edx\n", CONTEXTOFFSET(Edx) );
 502
 503         /* Get the 16-bit ds */
 504         fprintf( outfile, "\tpopw %%ds\n" );
 505     }
 506     else  /* not a register function */
 507     {
 508         /* Push the called routine address */
 509         fprintf( outfile, "\tpushl %d(%%edx)\n", STACK32OFFSET(target) );
 510
 511         /* Set %fs and %gs to the value saved by the last CallFrom16 */
 512         fprintf( outfile, "\tpushw %d(%%ebp)\n", STACK16OFFSET(fs)-STACK16OFFSET(bp) );
 513         fprintf( outfile, "\tpopw %%fs\n" );
 514         fprintf( outfile, "\tpushw %d(%%ebp)\n", STACK16OFFSET(gs)-STACK16OFFSET(bp) );
 515         fprintf( outfile, "\tpopw %%gs\n" );
 516
 517         /* Set %ds and %es (and %ax just in case) equal to %ss */
 518         fprintf( outfile, "\tmovw %%ss,%%ax\n" );
 519         fprintf( outfile, "\tmovw %%ax,%%ds\n" );
 520         fprintf( outfile, "\tmovw %%ax,%%es\n" );
 521     }
 522
 523     /* Jump to the called routine */
 524     fprintf( outfile, "\t.byte 0x66\n" );
 525     fprintf( outfile, "\tlret\n" );
 526
 527     /* Function footer */
 528     function_footer( outfile, name );
 529 }
 530
 531
 532 /*******************************************************************
 533  *         BuildRet16Func
 534  *
 535  * Build the return code for 16-bit callbacks
 536  */
 537 static void BuildRet16Func( FILE *outfile )
 538 {
 539     function_header( outfile, "__wine_call_to_16_ret" );
 540
 541     /* Save %esp into %esi */
 542     fprintf( outfile, "\tmovl %%esp,%%esi\n" );
 543
 544     /* Restore 32-bit segment registers */
 545
 546     fprintf( outfile, "\t.byte 0x2e\n\tmovl %s", asm_name("CallTo16_DataSelector") );
 547     fprintf( outfile, "-%s,%%edi\n", asm_name("__wine_call16_start") );
 548     fprintf( outfile, "%s\tmovw %%di,%%ds\n", data16_prefix() );
 549     fprintf( outfile, "%s\tmovw %%di,%%es\n", data16_prefix() );
 550
 551     fprintf( outfile, "\t.byte 0x2e\n\tmov %s", asm_name("CallTo16_TebSelector") );
 552     fprintf( outfile, "-%s,%%fs\n", asm_name("__wine_call16_start") );
 553
 554     fprintf( outfile, "\t.byte 0x64\n\tmov (%d),%%gs\n", STRUCTOFFSET(TEB,gs_sel) );
 555
 556     /* Restore the 32-bit stack */
 557
 558     fprintf( outfile, "%s\tmovw %%di,%%ss\n", data16_prefix() );
 559     fprintf( outfile, "\t.byte 0x64\n\tmovl (%d),%%esp\n", STACKOFFSET );
 560
 561     /* Return to caller */
 562
 563     fprintf( outfile, "\tlret\n" );
 564     function_footer( outfile, "__wine_call_to_16_ret" );
 565 }
 566
 567
 568 /*******************************************************************
 569  *         BuildCallTo32CBClient
 570  *
 571  * Call a CBClient relay stub from 32-bit code (KERNEL.620).
 572  *
 573  * Since the relay stub is itself 32-bit, this should not be a problem;
 574  * unfortunately, the relay stubs are expected to switch back to a
 575  * 16-bit stack (and 16-bit code) after completion :-(
 576  *
 577  * This would conflict with our 16- vs. 32-bit stack handling, so
 578  * we simply switch *back* to our 32-bit stack before returning to
 579  * the caller ...
 580  *
 581  * The CBClient relay stub expects to be called with the following
 582  * 16-bit stack layout, and with ebp and ebx pointing into the 16-bit
 583  * stack at the designated places:
 584  *
 585  *    ...
 586  *  (ebp+14) original arguments to the callback routine
 587  *  (ebp+10) far return address to original caller
 588  *  (ebp+6)  Thunklet target address
 589  *  (ebp+2)  Thunklet relay ID code
 590  *  (ebp)    BP (saved by CBClientGlueSL)
 591  *  (ebp-2)  SI (saved by CBClientGlueSL)
 592  *  (ebp-4)  DI (saved by CBClientGlueSL)
 593  *  (ebp-6)  DS (saved by CBClientGlueSL)
 594  *
 595  *   ...     buffer space used by the 16-bit side glue for temp copies
 596  *
 597  *  (ebx+4)  far return address to 16-bit side glue code
 598  *  (ebx)    saved 16-bit ss:sp (pointing to ebx+4)
 599  *
 600  * The 32-bit side glue code accesses both the original arguments (via ebp)
 601  * and the temporary copies prepared by the 16-bit side glue (via ebx).
 602  * After completion, the stub will load ss:sp from the buffer at ebx
 603  * and perform a far return to 16-bit code.
 604  *
 605  * To trick the relay stub into returning to us, we replace the 16-bit
 606  * return address to the glue code by a cs:ip pair pointing to our
 607  * return entry point (the original return address is saved first).
 608  * Our return stub thus called will then reload the 32-bit ss:esp and
 609  * return to 32-bit code (by using and ss:esp value that we have also
 610  * pushed onto the 16-bit stack before and a cs:eip values found at
 611  * that position on the 32-bit stack).  The ss:esp to be restored is
 612  * found relative to the 16-bit stack pointer at:
 613  *
 614  *  (ebx-4)   ss  (flat)
 615  *  (ebx-8)   sp  (32-bit stack pointer)
 616  *
 617  * The second variant of this routine, CALL32_CBClientEx, which is used
 618  * to implement KERNEL.621, has to cope with yet another problem: Here,
 619  * the 32-bit side directly returns to the caller of the CBClient thunklet,
 620  * restoring registers saved by CBClientGlueSL and cleaning up the stack.
 621  * As we have to return to our 32-bit code first, we have to adapt the
 622  * layout of our temporary area so as to include values for the registers
 623  * that are to be restored, and later (in the implementation of KERNEL.621)
 624  * we *really* restore them. The return stub restores DS, DI, SI, and BP
 625  * from the stack, skips the next 8 bytes (CBClient relay code / target),
 626  * and then performs a lret NN, where NN is the number of arguments to be
 627  * removed. Thus, we prepare our temporary area as follows:
 628  *
 629  *     (ebx+22) 16-bit cs  (this segment)
 630  *     (ebx+20) 16-bit ip  ('16-bit' return entry point)
 631  *     (ebx+16) 32-bit ss  (flat)
 632  *     (ebx+12) 32-bit sp  (32-bit stack pointer)
 633  *     (ebx+10) 16-bit bp  (points to ebx+24)
 634  *     (ebx+8)  16-bit si  (ignored)
 635  *     (ebx+6)  16-bit di  (ignored)
 636  *     (ebx+4)  16-bit ds  (we actually use the flat DS here)
 637  *     (ebx+2)  16-bit ss  (16-bit stack segment)
 638  *     (ebx+0)  16-bit sp  (points to ebx+4)
 639  *
 640  * Note that we ensure that DS is not changed and remains the flat segment,
 641  * and the 32-bit stack pointer our own return stub needs fits just
 642  * perfectly into the 8 bytes that are skipped by the Windows stub.
 643  * One problem is that we have to determine the number of removed arguments,
 644  * as these have to be really removed in KERNEL.621. Thus, the BP value
 645  * that we place in the temporary area to be restored, contains the value
 646  * that SP would have if no arguments were removed. By comparing the actual
 647  * value of SP with this value in our return stub we can compute the number
 648  * of removed arguments. This is then returned to KERNEL.621.
 649  *
 650  * The stack layout of this function:
 651  * (ebp+20)  nArgs     pointer to variable receiving nr. of args (Ex only)
 652  * (ebp+16)  esi       pointer to caller's esi value
 653  * (ebp+12)  arg       ebp value to be set for relay stub
 654  * (ebp+8)   func      CBClient relay stub address
 655  * (ebp+4)   ret addr
 656  * (ebp)     ebp
 657  */
 658 static void BuildCallTo32CBClient( FILE *outfile, BOOL isEx )
 659 {
 660     function_header( outfile, isEx ? "CALL32_CBClientEx" : "CALL32_CBClient" );
 661
 662     /* Entry code */
 663
 664     fprintf( outfile, "\tpushl %%ebp\n" );
 665     fprintf( outfile, "\tmovl %%esp,%%ebp\n" );
 666     fprintf( outfile, "\tpushl %%edi\n" );
 667     fprintf( outfile, "\tpushl %%esi\n" );
 668     fprintf( outfile, "\tpushl %%ebx\n" );
 669
 670     /* Get pointer to temporary area and save the 32-bit stack pointer */
 671
 672     fprintf( outfile, "\tmovl 16(%%ebp), %%ebx\n" );
 673     fprintf( outfile, "\tleal -8(%%esp), %%eax\n" );
 674
 675     if ( !isEx )
 676         fprintf( outfile, "\tmovl %%eax, -8(%%ebx)\n" );
 677     else
 678         fprintf( outfile, "\tmovl %%eax, 12(%%ebx)\n" );
 679
 680     /* Set up registers and call CBClient relay stub (simulating a far call) */
 681
 682     fprintf( outfile, "\tmovl 20(%%ebp), %%esi\n" );
 683     fprintf( outfile, "\tmovl (%%esi), %%esi\n" );
 684
 685     fprintf( outfile, "\tmovl 8(%%ebp), %%eax\n" );
 686     fprintf( outfile, "\tmovl 12(%%ebp), %%ebp\n" );
 687
 688     fprintf( outfile, "\tpushl %%cs\n" );
 689     fprintf( outfile, "\tcall *%%eax\n" );
 690
 691     /* Return new esi value to caller */
 692
 693     fprintf( outfile, "\tmovl 32(%%esp), %%edi\n" );
 694     fprintf( outfile, "\tmovl %%esi, (%%edi)\n" );
 695
 696     /* Return argument size to caller */
 697     if ( isEx )
 698     {
 699         fprintf( outfile, "\tmovl 36(%%esp), %%ebx\n" );
 700         fprintf( outfile, "\tmovl %%ebp, (%%ebx)\n" );
 701     }
 702
 703     /* Restore registers and return */
 704
 705     fprintf( outfile, "\tpopl %%ebx\n" );
 706     fprintf( outfile, "\tpopl %%esi\n" );
 707     fprintf( outfile, "\tpopl %%edi\n" );
 708     fprintf( outfile, "\tpopl %%ebp\n" );
 709     fprintf( outfile, "\tret\n" );
 710     function_footer( outfile, isEx ? "CALL32_CBClientEx" : "CALL32_CBClient" );
 711
 712     /* '16-bit' return stub */
 713
 714     function_header( outfile, isEx ? "CALL32_CBClientEx_Ret" : "CALL32_CBClient_Ret" );
 715     if ( !isEx )
 716     {
 717         fprintf( outfile, "\tmovzwl %%sp, %%ebx\n" );
 718         fprintf( outfile, "\tlssl %%ss:-16(%%ebx), %%esp\n" );
 719     }
 720     else
 721     {
 722         fprintf( outfile, "\tmovzwl %%bp, %%ebx\n" );
 723         fprintf( outfile, "\tsubw %%bp, %%sp\n" );
 724         fprintf( outfile, "\tmovzwl %%sp, %%ebp\n" );
 725         fprintf( outfile, "\tlssl %%ss:-12(%%ebx), %%esp\n" );
 726     }
 727     fprintf( outfile, "\tlret\n" );
 728     function_footer( outfile, isEx ? "CALL32_CBClientEx_Ret" : "CALL32_CBClient_Ret" );
 729 }
 730
 731
 732 /*******************************************************************
 733  *         BuildCallFrom32Regs
 734  *
 735  * Build a 32-bit-to-Wine call-back function for a 'register' function.
 736  * 'args' is the number of dword arguments.
 737  *
 738  * Stack layout:
 739  *   ...
 740  * (ebp+12)  first arg
 741  * (ebp+8)   ret addr to user code
 742  * (ebp+4)   ret addr to relay code
 743  * (ebp+0)   saved ebp
 744  * (ebp-128) buffer area to allow stack frame manipulation
 745  * (ebp-332) CONTEXT86 struct
 746  * (ebp-336) CONTEXT86 *argument
 747  *  ....     other arguments copied from (ebp+12)
 748  *
 749  * The entry point routine is called with a CONTEXT* extra argument,
 750  * following the normal args. In this context structure, EIP_reg
 751  * contains the return address to user code, and ESP_reg the stack
 752  * pointer on return (with the return address and arguments already
 753  * removed).
 754  */
 755 static void BuildCallFrom32Regs( FILE *outfile )
 756 {
 757     static const int STACK_SPACE = 128 + sizeof(CONTEXT86);
 758
 759     /* Function header */
 760
 761     function_header( outfile, "__wine_call_from_32_regs" );
 762
 763     /* Allocate some buffer space on the stack */
 764
 765     fprintf( outfile, "\tpushl %%ebp\n" );
 766     fprintf( outfile, "\tmovl %%esp,%%ebp\n ");
 767     fprintf( outfile, "\tleal -%d(%%esp), %%esp\n", STACK_SPACE );
 768
 769     /* Build the context structure */
 770
 771     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Eax) - STACK_SPACE );
 772     fprintf( outfile, "\tpushfl\n" );
 773     fprintf( outfile, "\tpopl %%eax\n" );
 774     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(EFlags) - STACK_SPACE );
 775     fprintf( outfile, "\tmovl 0(%%ebp),%%eax\n" );
 776     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Ebp) - STACK_SPACE );
 777     fprintf( outfile, "\tmovl %%ebx,%d(%%ebp)\n", CONTEXTOFFSET(Ebx) - STACK_SPACE );
 778     fprintf( outfile, "\tmovl %%ecx,%d(%%ebp)\n", CONTEXTOFFSET(Ecx) - STACK_SPACE );
 779     fprintf( outfile, "\tmovl %%edx,%d(%%ebp)\n", CONTEXTOFFSET(Edx) - STACK_SPACE );
 780     fprintf( outfile, "\tmovl %%esi,%d(%%ebp)\n", CONTEXTOFFSET(Esi) - STACK_SPACE );
 781     fprintf( outfile, "\tmovl %%edi,%d(%%ebp)\n", CONTEXTOFFSET(Edi) - STACK_SPACE );
 782
 783     fprintf( outfile, "\txorl %%eax,%%eax\n" );
 784     fprintf( outfile, "\tmovw %%cs,%%ax\n" );
 785     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegCs) - STACK_SPACE );
 786     fprintf( outfile, "\tmovw %%es,%%ax\n" );
 787     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegEs) - STACK_SPACE );
 788     fprintf( outfile, "\tmovw %%fs,%%ax\n" );
 789     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegFs) - STACK_SPACE );
 790     fprintf( outfile, "\tmovw %%gs,%%ax\n" );
 791     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegGs) - STACK_SPACE );
 792     fprintf( outfile, "\tmovw %%ss,%%ax\n" );
 793     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegSs) - STACK_SPACE );
 794     fprintf( outfile, "\tmovw %%ds,%%ax\n" );
 795     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegDs) - STACK_SPACE );
 796     fprintf( outfile, "\tmovw %%ax,%%es\n" );  /* set %es equal to %ds just in case */
 797
 798     fprintf( outfile, "\tmovl $0x%x,%%eax\n", CONTEXT86_FULL );
 799     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(ContextFlags) - STACK_SPACE );
 800
 801     fprintf( outfile, "\tmovl 8(%%ebp),%%eax\n" ); /* Get %eip at time of call */
 802     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Eip) - STACK_SPACE );
 803
 804     /* Transfer the arguments */
 805
 806     fprintf( outfile, "\tmovl 4(%%ebp),%%ebx\n" );   /* get relay code addr */
 807     fprintf( outfile, "\tpushl %%esp\n" );           /* push ptr to context struct */
 808     fprintf( outfile, "\tmovzbl 4(%%ebx),%%ecx\n" ); /* fetch number of args to copy */
 809     fprintf( outfile, "\tjecxz 1f\n" );
 810     fprintf( outfile, "\tsubl %%ecx,%%esp\n" );
 811     fprintf( outfile, "\tleal 12(%%ebp),%%esi\n" );  /* get %esp at time of call */
 812     fprintf( outfile, "\tmovl %%esp,%%edi\n" );
 813     fprintf( outfile, "\tshrl $2,%%ecx\n" );
 814     fprintf( outfile, "\tcld\n" );
 815     fprintf( outfile, "\trep\n\tmovsl\n" );  /* copy args */
 816
 817     fprintf( outfile, "1:\tmovzbl 5(%%ebx),%%eax\n" ); /* fetch number of args to remove */
 818     fprintf( outfile, "\tleal 12(%%ebp,%%eax),%%eax\n" );
 819     fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Esp) - STACK_SPACE );
 820
 821     /* Call the entry point */
 822
 823     fprintf( outfile, "\taddl (%%ebx),%%ebx\n" );
 824     fprintf( outfile, "\tcall *%%ebx\n" );
 825     fprintf( outfile, "\tleal -%d(%%ebp),%%ecx\n", STACK_SPACE );
 826
 827     /* Restore the context structure */
 828
 829     fprintf( outfile, "2:\tpushl %d(%%ecx)\n", CONTEXTOFFSET(SegEs) );
 830     fprintf( outfile, "\tpopl %%es\n" );
 831     fprintf( outfile, "\tpushl %d(%%ecx)\n", CONTEXTOFFSET(SegFs) );
 832     fprintf( outfile, "\tpopl %%fs\n" );
 833     fprintf( outfile, "\tpushl %d(%%ecx)\n", CONTEXTOFFSET(SegGs) );
 834     fprintf( outfile, "\tpopl %%gs\n" );
 835
 836     fprintf( outfile, "\tmovl %d(%%ecx),%%edi\n", CONTEXTOFFSET(Edi) );
 837     fprintf( outfile, "\tmovl %d(%%ecx),%%esi\n", CONTEXTOFFSET(Esi) );
 838     fprintf( outfile, "\tmovl %d(%%ecx),%%edx\n", CONTEXTOFFSET(Edx) );
 839     fprintf( outfile, "\tmovl %d(%%ecx),%%ebx\n", CONTEXTOFFSET(Ebx) );
 840     fprintf( outfile, "\tmovl %d(%%ecx),%%eax\n", CONTEXTOFFSET(Eax) );
 841     fprintf( outfile, "\tmovl %d(%%ecx),%%ebp\n", CONTEXTOFFSET(Ebp) );
 842
 843     fprintf( outfile, "\tpushl %d(%%ecx)\n", CONTEXTOFFSET(SegSs) );
 844     fprintf( outfile, "\tpopl %%ss\n" );
 845     fprintf( outfile, "\tmovl %d(%%ecx),%%esp\n", CONTEXTOFFSET(Esp) );
 846
 847     fprintf( outfile, "\tpushl %d(%%ecx)\n", CONTEXTOFFSET(EFlags) );
 848     fprintf( outfile, "\tpushl %d(%%ecx)\n", CONTEXTOFFSET(SegCs) );
 849     fprintf( outfile, "\tpushl %d(%%ecx)\n", CONTEXTOFFSET(Eip) );
 850     fprintf( outfile, "\tpushl %d(%%ecx)\n", CONTEXTOFFSET(SegDs) );
 851     fprintf( outfile, "\tmovl %d(%%ecx),%%ecx\n", CONTEXTOFFSET(Ecx) );
 852
 853     fprintf( outfile, "\tpopl %%ds\n" );
 854     fprintf( outfile, "\tiret\n" );
 855     function_footer( outfile, "__wine_call_from_32_regs" );
 856
 857     function_header( outfile, "__wine_call_from_32_restore_regs" );
 858     fprintf( outfile, "\tleal 4(%%esp),%%ecx\n" );
 859     fprintf( outfile, "\tjmp 2b\n" );
 860     function_footer( outfile, "__wine_call_from_32_restore_regs" );
 861 }
 862
 863
 864 /*******************************************************************
 865  *         BuildPendingEventCheck
 866  *
 867  * Build a function that checks whether there are any
 868  * pending DPMI events.
 869  *
 870  * Stack layout:
 871  *
 872  * (sp+12) long   eflags
 873  * (sp+6)  long   cs
 874  * (sp+2)  long   ip
 875  * (sp)    word   fs
 876  *
 877  * On entry to function, fs register points to a valid TEB.
 878  * On exit from function, stack will be popped.
 879  */
 880 static void BuildPendingEventCheck( FILE *outfile )
 881 {
 882     /* Function header */
 883
 884     function_header( outfile, "DPMI_PendingEventCheck" );
 885
 886     /* Check for pending events. */
 887
 888     fprintf( outfile, "\t.byte 0x64\n\ttestl $0xffffffff,(%d)\n",
 889              STRUCTOFFSET(TEB,vm86_pending) );
 890     fprintf( outfile, "\tje %s\n", asm_name("DPMI_PendingEventCheck_Cleanup") );
 891
 892     fprintf( outfile, "\t.byte 0x64\n\ttestl $0xffffffff,(%d)\n",
 893              STRUCTOFFSET(TEB,dpmi_vif) );
 894
 895     fprintf( outfile, "\tje %s\n", asm_name("DPMI_PendingEventCheck_Cleanup") );
 896
 897     /* Process pending events. */
 898
 899     fprintf( outfile, "\tsti\n" );
 900
 901     /* Start cleanup. Restore fs register. */
 902
 903     fprintf( outfile, "\t.globl %s\n", asm_name("DPMI_PendingEventCheck_Cleanup") );
 904     fprintf( outfile, "%s:\n", asm_name("DPMI_PendingEventCheck_Cleanup") );
 905     fprintf( outfile, "\tpopw %%fs\n" );
 906
 907     /* Return from function. */
 908
 909     fprintf( outfile, "\t.globl %s\n", asm_name("DPMI_PendingEventCheck_Return") );
 910     fprintf( outfile, "%s:\n", asm_name("DPMI_PendingEventCheck_Return") );
 911     fprintf( outfile, "\tiret\n" );
 912
 913     function_footer( outfile, "DPMI_PendingEventCheck" );
 914 }
 915
 916
 917 /*******************************************************************
 918  *         BuildRelays16
 919  *
 920  * Build all the 16-bit relay callbacks
 921  */
 922 void BuildRelays16( FILE *outfile )
 923 {
 924     if (target_cpu != CPU_x86)
 925     {
 926         fprintf( outfile, "/* File not used with this architecture. Do not edit! */\n\n" );
 927         return;
 928     }
 929
 930     /* File header */
 931
 932     fprintf( outfile, "/* File generated automatically. Do not edit! */\n\n" );
 933     fprintf( outfile, "\t.text\n" );
 934
 935     fprintf( outfile, "%s:\n\n", asm_name("__wine_spec_thunk_text_16") );
 936
 937     fprintf( outfile, "\t.globl %s\n", asm_name("__wine_call16_start") );
 938     fprintf( outfile, "%s:\n", asm_name("__wine_call16_start") );
 939
 940     /* Standard CallFrom16 routine (WORD return) */
 941     BuildCallFrom16Core( outfile, FALSE, FALSE, TRUE );
 942
 943     /* Standard CallFrom16 routine (DWORD return) */
 944     BuildCallFrom16Core( outfile, FALSE, FALSE, FALSE );
 945
 946     /* Register CallFrom16 routine */
 947     BuildCallFrom16Core( outfile, TRUE, FALSE, FALSE );
 948
 949     /* C16ThkSL CallFrom16 routine */
 950     BuildCallFrom16Core( outfile, FALSE, TRUE, FALSE );
 951
 952     /* Standard CallTo16 routine */
 953     BuildCallTo16Core( outfile, 0 );
 954
 955     /* Register CallTo16 routine */
 956     BuildCallTo16Core( outfile, 1 );
 957
 958     /* Standard CallTo16 return stub */
 959     BuildRet16Func( outfile );
 960
 961     /* CBClientThunkSL routine */
 962     BuildCallTo32CBClient( outfile, FALSE );
 963
 964     /* CBClientThunkSLEx routine */
 965     BuildCallTo32CBClient( outfile, TRUE  );
 966
 967     /* Pending DPMI events check stub */
 968     BuildPendingEventCheck( outfile );
 969
 970     fprintf( outfile, "\t.globl %s\n", asm_name("__wine_call16_end") );
 971     fprintf( outfile, "%s:\n", asm_name("__wine_call16_end") );
 972     function_footer( outfile, "__wine_spec_thunk_text_16" );
 973
 974     /* Declare the return address and data selector variables */
 975     fprintf( outfile, "\n\t.data\n\t.align %d\n", get_alignment(4) );
 976     fprintf( outfile, "\t.globl %s\n", asm_name("CallTo16_DataSelector") );
 977     fprintf( outfile, "%s:\t.long 0\n", asm_name("CallTo16_DataSelector") );
 978     fprintf( outfile, "\t.globl %s\n", asm_name("CallTo16_TebSelector") );
 979     fprintf( outfile, "%s:\t.long 0\n", asm_name("CallTo16_TebSelector") );
 980     if (UsePIC) fprintf( outfile, "wine_ldt_copy_ptr:\t.long %s\n", asm_name("wine_ldt_copy") );
 981 }
 982
 983 /*******************************************************************
 984  *         BuildRelays32
 985  *
 986  * Build all the 32-bit relay callbacks
 987  */
 988 void BuildRelays32( FILE *outfile )
 989 {
 990     if (target_cpu != CPU_x86)
 991     {
 992         fprintf( outfile, "/* File not used with this architecture. Do not edit! */\n\n" );
 993         return;
 994     }
 995
 996     /* File header */
 997
 998     fprintf( outfile, "/* File generated automatically. Do not edit! */\n\n" );
 999     fprintf( outfile, "\t.text\n" );
1000     fprintf( outfile, "%s:\n\n", asm_name("__wine_spec_thunk_text_32") );
1001
1002     /* 32-bit register entry point */
1003     BuildCallFrom32Regs( outfile );
1004
1005     function_footer( outfile, "__wine_spec_thunk_text_32" );
1006 }