2 * Relay calls helper routines
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
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.
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.
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
26 #include "wine/port.h"
31 #include "stackframe.h"
35 #if defined(__GNUC__) && !defined(__svr4__)
36 static const int use_stabs = 1;
38 static const int use_stabs = 0;
43 static void function_header( FILE *outfile, const char *name )
45 fprintf( outfile, "\n\t.align %d\n", get_alignment(4) );
46 if (use_stabs) fprintf( outfile, "\t.stabs \"%s:F1\",36,0,0," PREFIX "%s\n", name, name);
47 #ifdef NEED_TYPE_IN_DEF
48 fprintf( outfile, "\t.def " PREFIX "%s; .scl 2; .type 32; .endef\n", name );
50 fprintf( outfile, "\t.type " PREFIX "%s,@function\n", name );
52 fprintf( outfile, "\t.globl " PREFIX "%s\n", name );
53 fprintf( outfile, PREFIX "%s:\n", name );
57 /*******************************************************************
60 * This routine builds the core routines used in 16->32 thunks:
61 * CallFrom16Word, CallFrom16Long, CallFrom16Register, and CallFrom16Thunk.
63 * These routines are intended to be called via a far call (with 32-bit
64 * operand size) from 16-bit code. The 16-bit code stub must push %bp,
65 * the 32-bit entry point to be called, and the argument conversion
66 * routine to be used (see stack layout below).
68 * The core routine completes the STACK16FRAME on the 16-bit stack and
69 * switches to the 32-bit stack. Then, the argument conversion routine
70 * is called; it gets passed the 32-bit entry point and a pointer to the
71 * 16-bit arguments (on the 16-bit stack) as parameters. (You can either
72 * use conversion routines automatically generated by BuildCallFrom16,
73 * or write your own for special purposes.)
75 * The conversion routine must call the 32-bit entry point, passing it
76 * the converted arguments, and return its return value to the core.
77 * After the conversion routine has returned, the core switches back
78 * to the 16-bit stack, converts the return value to the DX:AX format
79 * (CallFrom16Long), and returns to the 16-bit call stub. All parameters,
80 * including %bp, are popped off the stack.
82 * The 16-bit call stub now returns to the caller, popping the 16-bit
83 * arguments if necessary (pascal calling convention).
85 * In the case of a 'register' function, CallFrom16Register fills a
86 * CONTEXT86 structure with the values all registers had at the point
87 * the first instruction of the 16-bit call stub was about to be
88 * executed. A pointer to this CONTEXT86 is passed as third parameter
89 * to the argument conversion routine, which typically passes it on
90 * to the called 32-bit entry point.
92 * CallFrom16Thunk is a special variant used by the implementation of
93 * the Win95 16->32 thunk functions C16ThkSL and C16ThkSL01 and is
94 * implemented as follows:
95 * On entry, the EBX register is set up to contain a flat pointer to the
96 * 16-bit stack such that EBX+22 points to the first argument.
97 * Then, the entry point is called, while EBP is set up to point
98 * to the return address (on the 32-bit stack).
99 * The called function returns with CX set to the number of bytes
100 * to be popped of the caller's stack.
102 * Stack layout upon entry to the core routine (STACK16FRAME):
104 * (sp+24) word first 16-bit arg
108 * (sp+14) long 32-bit entry point (reused for Win16 mutex recursion count)
109 * (sp+12) word ip of actual entry point (necessary for relay debugging)
110 * (sp+8) long relay (argument conversion) function entry point
111 * (sp+4) long cs of 16-bit entry point
112 * (sp) long ip of 16-bit entry point
114 * Added on the stack:
115 * (sp-2) word saved gs
116 * (sp-4) word saved fs
117 * (sp-6) word saved es
118 * (sp-8) word saved ds
119 * (sp-12) long saved ebp
120 * (sp-16) long saved ecx
121 * (sp-20) long saved edx
122 * (sp-24) long saved previous stack
124 static void BuildCallFrom16Core( FILE *outfile, int reg_func, int thunk, int short_ret )
126 char *name = thunk? "thunk" : reg_func? "regs" : short_ret? "word" : "long";
128 /* Function header */
129 if (thunk) function_header( outfile, "__wine_call_from_16_thunk" );
130 else if (reg_func) function_header( outfile, "__wine_call_from_16_regs" );
131 else if (short_ret) function_header( outfile, "__wine_call_from_16_word" );
132 else function_header( outfile, "__wine_call_from_16_long" );
134 /* Create STACK16FRAME (except STACK32FRAME link) */
135 fprintf( outfile, "\tpushw %%gs\n" );
136 fprintf( outfile, "\tpushw %%fs\n" );
137 fprintf( outfile, "\tpushw %%es\n" );
138 fprintf( outfile, "\tpushw %%ds\n" );
139 fprintf( outfile, "\tpushl %%ebp\n" );
140 fprintf( outfile, "\tpushl %%ecx\n" );
141 fprintf( outfile, "\tpushl %%edx\n" );
143 /* Save original EFlags register */
144 fprintf( outfile, "\tpushfl\n" );
148 /* Get Global Offset Table into %ecx */
149 fprintf( outfile, "\tcall .L__wine_call_from_16_%s.getgot1\n", name );
150 fprintf( outfile, ".L__wine_call_from_16_%s.getgot1:\n", name );
151 fprintf( outfile, "\tpopl %%ecx\n" );
152 fprintf( outfile, "\taddl $_GLOBAL_OFFSET_TABLE_+[.-.L__wine_call_from_16_%s.getgot1], %%ecx\n", name );
157 fprintf( outfile, "\t.byte 0x2e\n\tmovl " PREFIX "CallTo16_DataSelector@GOT(%%ecx), %%edx\n" );
158 fprintf( outfile, "\t.byte 0x2e\n\tmovl (%%edx), %%edx\n" );
161 fprintf( outfile, "\t.byte 0x2e\n\tmovl " PREFIX "CallTo16_DataSelector,%%edx\n" );
163 /* Load 32-bit segment registers */
165 fprintf( outfile, "\tdata16\n");
167 fprintf( outfile, "\tmovw %%dx, %%ds\n" );
169 fprintf( outfile, "\tdata16\n");
171 fprintf( outfile, "\tmovw %%dx, %%es\n" );
175 fprintf( outfile, "\tmovl " PREFIX "SYSLEVEL_Win16CurrentTeb@GOT(%%ecx), %%edx\n" );
176 fprintf( outfile, "\tmovw (%%edx), %%fs\n" );
179 fprintf( outfile, "\tmovw " PREFIX "SYSLEVEL_Win16CurrentTeb, %%fs\n" );
181 /* Get address of wine_ldt_copy array into %ecx */
183 fprintf( outfile, "\tmovl " PREFIX "wine_ldt_copy@GOT(%%ecx), %%ecx\n" );
185 fprintf( outfile, "\tmovl $" PREFIX "wine_ldt_copy, %%ecx\n" );
187 /* Translate STACK16FRAME base to flat offset in %edx */
188 fprintf( outfile, "\tmovw %%ss, %%dx\n" );
189 fprintf( outfile, "\tandl $0xfff8, %%edx\n" );
190 fprintf( outfile, "\tshrl $1, %%edx\n" );
191 fprintf( outfile, "\tmovl (%%ecx,%%edx), %%edx\n" );
192 fprintf( outfile, "\tmovzwl %%sp, %%ebp\n" );
193 fprintf( outfile, "\tleal (%%ebp,%%edx), %%edx\n" );
195 /* Get saved flags into %ecx */
196 fprintf( outfile, "\tpopl %%ecx\n" );
198 /* Get the 32-bit stack pointer from the TEB and complete STACK16FRAME */
199 fprintf( outfile, "\t.byte 0x64\n\tmovl (%d), %%ebp\n", STACKOFFSET );
200 fprintf( outfile, "\tpushl %%ebp\n" );
204 fprintf( outfile,"\tdata16\n");
206 fprintf( outfile, "\t.byte 0x64\n\tmovw %%ss, (%d)\n", STACKOFFSET + 2 );
207 fprintf( outfile, "\t.byte 0x64\n\tmovw %%sp, (%d)\n", STACKOFFSET );
208 fprintf( outfile, "\tpushl %%ds\n" );
209 fprintf( outfile, "\tpopl %%ss\n" );
210 fprintf( outfile, "\tmovl %%ebp, %%esp\n" );
211 fprintf( outfile, "\taddl $%d, %%ebp\n", STRUCTOFFSET(STACK32FRAME, ebp) );
215 STACK16FRAME is completely set up
216 DS, ES, SS: flat data segment
218 ESP: points to last STACK32FRAME
219 EBP: points to ebp member of last STACK32FRAME
220 EDX: points to current STACK16FRAME
221 ECX: contains saved flags
222 all other registers: unchanged */
224 /* Special case: C16ThkSL stub */
227 /* Set up registers as expected and call thunk */
228 fprintf( outfile, "\tleal %d(%%edx), %%ebx\n", sizeof(STACK16FRAME)-22 );
229 fprintf( outfile, "\tleal -4(%%esp), %%ebp\n" );
231 fprintf( outfile, "\tcall *%d(%%edx)\n", STACK16OFFSET(entry_point) );
233 /* Switch stack back */
234 fprintf( outfile, "\t.byte 0x64\n\tmovw (%d), %%ss\n", STACKOFFSET+2 );
235 fprintf( outfile, "\t.byte 0x64\n\tmovzwl (%d), %%esp\n", STACKOFFSET );
236 fprintf( outfile, "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
238 /* Restore registers and return directly to caller */
239 fprintf( outfile, "\taddl $8, %%esp\n" );
240 fprintf( outfile, "\tpopl %%ebp\n" );
241 fprintf( outfile, "\tpopw %%ds\n" );
242 fprintf( outfile, "\tpopw %%es\n" );
243 fprintf( outfile, "\tpopw %%fs\n" );
244 fprintf( outfile, "\tpopw %%gs\n" );
245 fprintf( outfile, "\taddl $20, %%esp\n" );
247 fprintf( outfile, "\txorb %%ch, %%ch\n" );
248 fprintf( outfile, "\tpopl %%ebx\n" );
249 fprintf( outfile, "\taddw %%cx, %%sp\n" );
250 fprintf( outfile, "\tpush %%ebx\n" );
252 fprintf( outfile, "\t.byte 0x66\n" );
253 fprintf( outfile, "\tlret\n" );
259 /* Build register CONTEXT */
262 fprintf( outfile, "\tsubl $%d, %%esp\n", sizeof(CONTEXT86) );
264 fprintf( outfile, "\tmovl %%ecx, %d(%%esp)\n", CONTEXTOFFSET(EFlags) );
266 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Eax) );
267 fprintf( outfile, "\tmovl %%ebx, %d(%%esp)\n", CONTEXTOFFSET(Ebx) );
268 fprintf( outfile, "\tmovl %%esi, %d(%%esp)\n", CONTEXTOFFSET(Esi) );
269 fprintf( outfile, "\tmovl %%edi, %d(%%esp)\n", CONTEXTOFFSET(Edi) );
271 fprintf( outfile, "\tmovl %d(%%edx), %%eax\n", STACK16OFFSET(ebp) );
272 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Ebp) );
273 fprintf( outfile, "\tmovl %d(%%edx), %%eax\n", STACK16OFFSET(ecx) );
274 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Ecx) );
275 fprintf( outfile, "\tmovl %d(%%edx), %%eax\n", STACK16OFFSET(edx) );
276 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Edx) );
278 fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(ds) );
279 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegDs) );
280 fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(es) );
281 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegEs) );
282 fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(fs) );
283 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegFs) );
284 fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(gs) );
285 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegGs) );
287 fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(cs) );
288 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegCs) );
289 fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(ip) );
290 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Eip) );
292 fprintf( outfile, "\t.byte 0x64\n\tmovzwl (%d), %%eax\n", STACKOFFSET+2 );
293 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegSs) );
294 fprintf( outfile, "\t.byte 0x64\n\tmovzwl (%d), %%eax\n", STACKOFFSET );
295 fprintf( outfile, "\taddl $%d, %%eax\n", STACK16OFFSET(ip) );
296 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Esp) );
298 fprintf( outfile, "\tfsave %d(%%esp)\n", CONTEXTOFFSET(FloatSave) );
301 /* Push address of CONTEXT86 structure -- popped by the relay routine */
302 fprintf( outfile, "\tpushl %%esp\n" );
306 /* Print debug info before call */
311 fprintf( outfile, "\tpushl %%ebx\n" );
313 /* Get Global Offset Table into %ebx (for PLT call) */
314 fprintf( outfile, "\tcall .L__wine_call_from_16_%s.getgot2\n", name );
315 fprintf( outfile, ".L__wine_call_from_16_%s.getgot2:\n", name );
316 fprintf( outfile, "\tpopl %%ebx\n" );
317 fprintf( outfile, "\taddl $_GLOBAL_OFFSET_TABLE_+[.-.L__wine_call_from_16_%s.getgot2], %%ebx\n", name );
320 fprintf( outfile, "\tpushl %%edx\n" );
322 fprintf( outfile, "\tleal -%d(%%ebp), %%eax\n\tpushl %%eax\n",
323 sizeof(CONTEXT) + STRUCTOFFSET(STACK32FRAME, ebp) );
325 fprintf( outfile, "\tpushl $0\n" );
328 fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallFrom16@PLT\n ");
330 fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallFrom16\n ");
332 fprintf( outfile, "\tpopl %%edx\n" );
333 fprintf( outfile, "\tpopl %%edx\n" );
336 fprintf( outfile, "\tpopl %%ebx\n" );
339 /* Call relay routine (which will call the API entry point) */
340 fprintf( outfile, "\tleal %d(%%edx), %%eax\n", sizeof(STACK16FRAME) );
341 fprintf( outfile, "\tpushl %%eax\n" );
342 fprintf( outfile, "\tpushl %d(%%edx)\n", STACK16OFFSET(entry_point) );
343 fprintf( outfile, "\tcall *%d(%%edx)\n", STACK16OFFSET(relay) );
345 /* Print debug info after call */
350 fprintf( outfile, "\tpushl %%ebx\n" );
352 /* Get Global Offset Table into %ebx (for PLT call) */
353 fprintf( outfile, "\tcall .L__wine_call_from_16_%s.getgot3\n", name );
354 fprintf( outfile, ".L__wine_call_from_16_%s.getgot3:\n", name );
355 fprintf( outfile, "\tpopl %%ebx\n" );
356 fprintf( outfile, "\taddl $_GLOBAL_OFFSET_TABLE_+[.-.L__wine_call_from_16_%s.getgot3], %%ebx\n", name );
359 fprintf( outfile, "\tpushl %%eax\n" );
361 fprintf( outfile, "\tleal -%d(%%ebp), %%eax\n\tpushl %%eax\n",
362 sizeof(CONTEXT) + STRUCTOFFSET(STACK32FRAME, ebp) );
364 fprintf( outfile, "\tpushl $0\n" );
367 fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallFrom16Ret@PLT\n ");
369 fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallFrom16Ret\n ");
371 fprintf( outfile, "\tpopl %%eax\n" );
372 fprintf( outfile, "\tpopl %%eax\n" );
375 fprintf( outfile, "\tpopl %%ebx\n" );
381 fprintf( outfile, "\tmovl %%esp, %%ebx\n" );
383 /* Switch stack back */
384 fprintf( outfile, "\t.byte 0x64\n\tmovw (%d), %%ss\n", STACKOFFSET+2 );
385 fprintf( outfile, "\t.byte 0x64\n\tmovzwl (%d), %%esp\n", STACKOFFSET );
386 fprintf( outfile, "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
388 /* Get return address to CallFrom16 stub */
389 fprintf( outfile, "\taddw $%d, %%sp\n", STACK16OFFSET(callfrom_ip)-4 );
390 fprintf( outfile, "\tpopl %%eax\n" );
391 fprintf( outfile, "\tpopl %%edx\n" );
393 /* Restore all registers from CONTEXT */
394 fprintf( outfile, "\tmovw %d(%%ebx), %%ss\n", CONTEXTOFFSET(SegSs) );
395 fprintf( outfile, "\tmovl %d(%%ebx), %%esp\n", CONTEXTOFFSET(Esp) );
396 fprintf( outfile, "\taddl $4, %%esp\n" ); /* room for final return address */
398 fprintf( outfile, "\tpushw %d(%%ebx)\n", CONTEXTOFFSET(SegCs) );
399 fprintf( outfile, "\tpushw %d(%%ebx)\n", CONTEXTOFFSET(Eip) );
400 fprintf( outfile, "\tpushl %%edx\n" );
401 fprintf( outfile, "\tpushl %%eax\n" );
402 fprintf( outfile, "\tpushl %d(%%ebx)\n", CONTEXTOFFSET(EFlags) );
403 fprintf( outfile, "\tpushl %d(%%ebx)\n", CONTEXTOFFSET(SegDs) );
405 fprintf( outfile, "\tmovw %d(%%ebx), %%es\n", CONTEXTOFFSET(SegEs) );
406 fprintf( outfile, "\tmovw %d(%%ebx), %%fs\n", CONTEXTOFFSET(SegFs) );
407 fprintf( outfile, "\tmovw %d(%%ebx), %%gs\n", CONTEXTOFFSET(SegGs) );
409 fprintf( outfile, "\tmovl %d(%%ebx), %%ebp\n", CONTEXTOFFSET(Ebp) );
410 fprintf( outfile, "\tmovl %d(%%ebx), %%esi\n", CONTEXTOFFSET(Esi) );
411 fprintf( outfile, "\tmovl %d(%%ebx), %%edi\n", CONTEXTOFFSET(Edi) );
412 fprintf( outfile, "\tmovl %d(%%ebx), %%eax\n", CONTEXTOFFSET(Eax) );
413 fprintf( outfile, "\tmovl %d(%%ebx), %%edx\n", CONTEXTOFFSET(Edx) );
414 fprintf( outfile, "\tmovl %d(%%ebx), %%ecx\n", CONTEXTOFFSET(Ecx) );
415 fprintf( outfile, "\tmovl %d(%%ebx), %%ebx\n", CONTEXTOFFSET(Ebx) );
417 fprintf( outfile, "\tpopl %%ds\n" );
418 fprintf( outfile, "\tpopfl\n" );
419 fprintf( outfile, "\tlret\n" );
423 /* Switch stack back */
424 fprintf( outfile, "\t.byte 0x64\n\tmovw (%d), %%ss\n", STACKOFFSET+2 );
425 fprintf( outfile, "\t.byte 0x64\n\tmovzwl (%d), %%esp\n", STACKOFFSET );
426 fprintf( outfile, "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
428 /* Restore registers */
429 fprintf( outfile, "\tpopl %%edx\n" );
430 fprintf( outfile, "\tpopl %%ecx\n" );
431 fprintf( outfile, "\tpopl %%ebp\n" );
432 fprintf( outfile, "\tpopw %%ds\n" );
433 fprintf( outfile, "\tpopw %%es\n" );
434 fprintf( outfile, "\tpopw %%fs\n" );
435 fprintf( outfile, "\tpopw %%gs\n" );
437 /* Prepare return value and set flags accordingly */
439 fprintf( outfile, "\tshldl $16, %%eax, %%edx\n" );
440 fprintf( outfile, "\torl %%eax, %%eax\n" );
442 /* Return to return stub which will return to caller */
443 fprintf( outfile, "\tlret $12\n" );
448 /*******************************************************************
451 * This routine builds the core routines used in 32->16 thunks:
453 * extern void WINAPI wine_call_to_16_word( SEGPTR target, int nb_args );
454 * extern void WINAPI wine_call_to_16_long( SEGPTR target, int nb_args );
455 * extern void WINAPI wine_call_to_16_regs_short( const CONTEXT86 *context, int nb_args );
456 * extern void WINAPI wine_call_to_16_regs_long ( const CONTEXT86 *context, int nb_args );
458 * These routines can be called directly from 32-bit code.
460 * All routines expect that the 16-bit stack contents (arguments) were
461 * already set up by the caller; nb_args must contain the number of bytes
462 * to be conserved. The 16-bit SS:SP will be set accordinly.
464 * All other registers are either taken from the CONTEXT86 structure
465 * or else set to default values. The target routine address is either
466 * given directly or taken from the CONTEXT86.
468 * If you want to call a 16-bit routine taking only standard argument types
469 * (WORD and LONG), you can also have an appropriate argument conversion
470 * stub automatically generated (see BuildCallTo16); you'd then call this
471 * stub, which in turn would prepare the 16-bit stack and call the appropiate
475 static void BuildCallTo16Core( FILE *outfile, int short_ret, int reg_func )
477 char *name = reg_func == 2 ? "regs_long" :
478 reg_func == 1 ? "regs_short" :
479 short_ret? "word" : "long";
481 /* Function header */
482 if (reg_func == 2) function_header( outfile, "wine_call_to_16_regs_long" );
483 else if (reg_func == 1) function_header( outfile, "wine_call_to_16_regs_short" );
484 else if (short_ret) function_header( outfile, "wine_call_to_16_word" );
485 else function_header( outfile, "wine_call_to_16_long" );
487 /* Function entry sequence */
488 fprintf( outfile, "\tpushl %%ebp\n" );
489 fprintf( outfile, "\tmovl %%esp, %%ebp\n" );
491 /* Save the 32-bit registers */
492 fprintf( outfile, "\tpushl %%ebx\n" );
493 fprintf( outfile, "\tpushl %%ecx\n" );
494 fprintf( outfile, "\tpushl %%edx\n" );
495 fprintf( outfile, "\tpushl %%esi\n" );
496 fprintf( outfile, "\tpushl %%edi\n" );
500 /* Get Global Offset Table into %ebx */
501 fprintf( outfile, "\tcall .Lwine_call_to_16_%s.getgot1\n", name );
502 fprintf( outfile, ".Lwine_call_to_16_%s.getgot1:\n", name );
503 fprintf( outfile, "\tpopl %%ebx\n" );
504 fprintf( outfile, "\taddl $_GLOBAL_OFFSET_TABLE_+[.-.Lwine_call_to_16_%s.getgot1], %%ebx\n", name );
507 /* Enter Win16 Mutex */
509 fprintf( outfile, "\tcall " PREFIX "_EnterWin16Lock@PLT\n" );
511 fprintf( outfile, "\tcall " PREFIX "_EnterWin16Lock\n" );
513 /* Print debugging info */
516 /* Push flags, number of arguments, and target */
517 fprintf( outfile, "\tpushl $%d\n", reg_func );
518 fprintf( outfile, "\tpushl 12(%%ebp)\n" );
519 fprintf( outfile, "\tpushl 8(%%ebp)\n" );
522 fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallTo16@PLT\n" );
524 fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallTo16\n" );
526 fprintf( outfile, "\taddl $12, %%esp\n" );
529 /* Get return address */
532 fprintf( outfile, "\tmovl " PREFIX "CallTo16_RetAddr@GOT(%%ebx), %%ecx\n" );
533 fprintf( outfile, "\tmovl " PREFIX "(%%ecx), %%ecx\n" );
536 fprintf( outfile, "\tmovl " PREFIX "CallTo16_RetAddr, %%ecx\n" );
538 /* Call the actual CallTo16 routine (simulate a lcall) */
539 fprintf( outfile, "\tpushl %%cs\n" );
540 fprintf( outfile, "\tcall .Lwine_call_to_16_%s\n", name );
544 /* Convert and push return value */
547 fprintf( outfile, "\tmovzwl %%ax, %%eax\n" );
548 fprintf( outfile, "\tpushl %%eax\n" );
552 fprintf( outfile, "\tshll $16,%%edx\n" );
553 fprintf( outfile, "\tmovw %%ax,%%dx\n" );
554 fprintf( outfile, "\tpushl %%edx\n" );
560 * Modify CONTEXT86 structure to contain new values
562 * NOTE: We restore only EAX, EBX, EDX, EDX, EBP, and ESP.
563 * The segment registers as well as ESI and EDI should
564 * not be modified by a well-behaved 16-bit routine in
565 * any case. [If necessary, we could restore them as well,
566 * at the cost of a somewhat less efficient return path.]
569 fprintf( outfile, "\tmovl %d(%%esp), %%edi\n", STACK32OFFSET(target)-12 );
570 fprintf( outfile, "\tmovl %%eax, %d(%%edi)\n", CONTEXTOFFSET(Eax) );
571 fprintf( outfile, "\tmovl %%ebx, %d(%%edi)\n", CONTEXTOFFSET(Ebx) );
572 fprintf( outfile, "\tmovl %%ecx, %d(%%edi)\n", CONTEXTOFFSET(Ecx) );
573 fprintf( outfile, "\tmovl %%edx, %d(%%edi)\n", CONTEXTOFFSET(Edx) );
574 fprintf( outfile, "\tmovl %%ebp, %d(%%edi)\n", CONTEXTOFFSET(Ebp) );
575 fprintf( outfile, "\tmovl %%esi, %d(%%edi)\n", CONTEXTOFFSET(Esp) );
576 /* The return glue code saved %esp into %esi */
578 fprintf( outfile, "\tpushl %%edi\n" );
583 /* Get Global Offset Table into %ebx (might have been overwritten) */
584 fprintf( outfile, "\tcall .Lwine_call_to_16_%s.getgot2\n", name );
585 fprintf( outfile, ".Lwine_call_to_16_%s.getgot2:\n", name );
586 fprintf( outfile, "\tpopl %%ebx\n" );
587 fprintf( outfile, "\taddl $_GLOBAL_OFFSET_TABLE_+[.-.Lwine_call_to_16_%s.getgot2], %%ebx\n", name );
590 /* Print debugging info */
593 fprintf( outfile, "\tpushl $%d\n", reg_func );
596 fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallTo16Ret@PLT\n" );
598 fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallTo16Ret\n" );
600 fprintf( outfile, "\taddl $4, %%esp\n" );
603 /* Leave Win16 Mutex */
605 fprintf( outfile, "\tcall " PREFIX "_LeaveWin16Lock@PLT\n" );
607 fprintf( outfile, "\tcall " PREFIX "_LeaveWin16Lock\n" );
609 /* Get return value */
610 fprintf( outfile, "\tpopl %%eax\n" );
612 /* Restore the 32-bit registers */
613 fprintf( outfile, "\tpopl %%edi\n" );
614 fprintf( outfile, "\tpopl %%esi\n" );
615 fprintf( outfile, "\tpopl %%edx\n" );
616 fprintf( outfile, "\tpopl %%ecx\n" );
617 fprintf( outfile, "\tpopl %%ebx\n" );
619 /* Function exit sequence */
620 fprintf( outfile, "\tpopl %%ebp\n" );
621 fprintf( outfile, "\tret $8\n" );
624 /* Start of the actual CallTo16 routine */
626 fprintf( outfile, ".Lwine_call_to_16_%s:\n", name );
628 /* Complete STACK32FRAME */
629 fprintf( outfile, "\t.byte 0x64\n\tpushl (%d)\n", STACKOFFSET );
630 fprintf( outfile, "\tmovl %%esp,%%edx\n" );
632 /* Switch to the 16-bit stack */
634 fprintf( outfile,"\tdata16\n");
636 fprintf( outfile, "\t.byte 0x64\n\tmovw (%d),%%ss\n", STACKOFFSET + 2);
637 fprintf( outfile, "\t.byte 0x64\n\tmovw (%d),%%sp\n", STACKOFFSET );
638 fprintf( outfile, "\t.byte 0x64\n\tmovl %%edx,(%d)\n", STACKOFFSET );
640 /* Make %bp point to the previous stackframe (built by CallFrom16) */
641 fprintf( outfile, "\tmovzwl %%sp,%%ebp\n" );
642 fprintf( outfile, "\tleal %d(%%ebp),%%ebp\n", STACK16OFFSET(bp) );
644 /* Add the specified offset to the new sp */
645 fprintf( outfile, "\tsubw %d(%%edx), %%sp\n", STACK32OFFSET(nb_args) );
647 /* Push the return address
648 * With sreg suffix, we push 16:16 address (normal lret)
649 * With lreg suffix, we push 16:32 address (0x66 lret, for KERNEL32_45)
652 fprintf( outfile, "\tpushl %%ecx\n" );
655 fprintf( outfile, "\tshldl $16, %%ecx, %%eax\n" );
656 fprintf( outfile, "\tpushw $0\n" );
657 fprintf( outfile, "\tpushw %%ax\n" );
658 fprintf( outfile, "\tpushw $0\n" );
659 fprintf( outfile, "\tpushw %%cx\n" );
664 /* Push the called routine address */
665 fprintf( outfile, "\tmovl %d(%%edx),%%edx\n", STACK32OFFSET(target) );
666 fprintf( outfile, "\tpushw %d(%%edx)\n", CONTEXTOFFSET(SegCs) );
667 fprintf( outfile, "\tpushw %d(%%edx)\n", CONTEXTOFFSET(Eip) );
669 /* Get the registers */
670 fprintf( outfile, "\tpushw %d(%%edx)\n", CONTEXTOFFSET(SegDs) );
671 fprintf( outfile, "\tmovl %d(%%edx),%%eax\n", CONTEXTOFFSET(SegEs) );
672 fprintf( outfile, "\tmovw %%ax,%%es\n" );
673 fprintf( outfile, "\tmovl %d(%%edx),%%eax\n", CONTEXTOFFSET(SegFs) );
674 fprintf( outfile, "\tmovw %%ax,%%fs\n" );
675 fprintf( outfile, "\tmovl %d(%%edx),%%ebp\n", CONTEXTOFFSET(Ebp) );
676 fprintf( outfile, "\tmovl %d(%%edx),%%esi\n", CONTEXTOFFSET(Esi) );
677 fprintf( outfile, "\tmovl %d(%%edx),%%edi\n", CONTEXTOFFSET(Edi) );
678 fprintf( outfile, "\tmovl %d(%%edx),%%eax\n", CONTEXTOFFSET(Eax) );
679 fprintf( outfile, "\tmovl %d(%%edx),%%ebx\n", CONTEXTOFFSET(Ebx) );
680 fprintf( outfile, "\tmovl %d(%%edx),%%ecx\n", CONTEXTOFFSET(Ecx) );
681 fprintf( outfile, "\tmovl %d(%%edx),%%edx\n", CONTEXTOFFSET(Edx) );
683 /* Get the 16-bit ds */
684 fprintf( outfile, "\tpopw %%ds\n" );
686 else /* not a register function */
688 /* Push the called routine address */
689 fprintf( outfile, "\tpushl %d(%%edx)\n", STACK32OFFSET(target) );
691 /* Set %fs to the value saved by the last CallFrom16 */
692 fprintf( outfile, "\tmovw %d(%%ebp),%%ax\n", STACK16OFFSET(fs)-STACK16OFFSET(bp) );
693 fprintf( outfile, "\tmovw %%ax,%%fs\n" );
695 /* Set %ds and %es (and %ax just in case) equal to %ss */
696 fprintf( outfile, "\tmovw %%ss,%%ax\n" );
697 fprintf( outfile, "\tmovw %%ax,%%ds\n" );
698 fprintf( outfile, "\tmovw %%ax,%%es\n" );
701 /* Jump to the called routine */
702 fprintf( outfile, "\t.byte 0x66\n" );
703 fprintf( outfile, "\tlret\n" );
707 /*******************************************************************
710 * Build the return code for 16-bit callbacks
712 static void BuildRet16Func( FILE *outfile )
715 * Note: This must reside in the .data section to allow
716 * run-time relocation of the SYSLEVEL_Win16CurrentTeb symbol
719 function_header( outfile, "CallTo16_Ret" );
721 /* Save %esp into %esi */
722 fprintf( outfile, "\tmovl %%esp,%%esi\n" );
724 /* Restore 32-bit segment registers */
726 fprintf( outfile, "\t.byte 0x2e\n\tmovl " PREFIX "CallTo16_DataSelector-" PREFIX "Call16_Ret_Start,%%edi\n" );
728 fprintf( outfile, "\tdata16\n");
730 fprintf( outfile, "\tmovw %%di,%%ds\n" );
732 fprintf( outfile, "\tdata16\n");
734 fprintf( outfile, "\tmovw %%di,%%es\n" );
736 fprintf( outfile, "\tmovw " PREFIX "SYSLEVEL_Win16CurrentTeb,%%fs\n" );
738 /* Restore the 32-bit stack */
741 fprintf( outfile, "\tdata16\n");
743 fprintf( outfile, "\tmovw %%di,%%ss\n" );
744 fprintf( outfile, "\t.byte 0x64\n\tmovl (%d),%%esp\n", STACKOFFSET );
745 fprintf( outfile, "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
747 /* Return to caller */
749 fprintf( outfile, "\tlret\n" );
751 /* Declare the return address and data selector variables */
753 fprintf( outfile, "\n\t.align %d\n", get_alignment(4) );
754 fprintf( outfile, "\t.globl " PREFIX "CallTo16_DataSelector\n" );
755 fprintf( outfile, PREFIX "CallTo16_DataSelector:\t.long 0\n" );
756 fprintf( outfile, "\t.globl " PREFIX "CallTo16_RetAddr\n" );
757 fprintf( outfile, PREFIX "CallTo16_RetAddr:\t.long 0\n" );
761 /*******************************************************************
762 * BuildCallTo32CBClient
764 * Call a CBClient relay stub from 32-bit code (KERNEL.620).
766 * Since the relay stub is itself 32-bit, this should not be a problem;
767 * unfortunately, the relay stubs are expected to switch back to a
768 * 16-bit stack (and 16-bit code) after completion :-(
770 * This would conflict with our 16- vs. 32-bit stack handling, so
771 * we simply switch *back* to our 32-bit stack before returning to
774 * The CBClient relay stub expects to be called with the following
775 * 16-bit stack layout, and with ebp and ebx pointing into the 16-bit
776 * stack at the designated places:
779 * (ebp+14) original arguments to the callback routine
780 * (ebp+10) far return address to original caller
781 * (ebp+6) Thunklet target address
782 * (ebp+2) Thunklet relay ID code
783 * (ebp) BP (saved by CBClientGlueSL)
784 * (ebp-2) SI (saved by CBClientGlueSL)
785 * (ebp-4) DI (saved by CBClientGlueSL)
786 * (ebp-6) DS (saved by CBClientGlueSL)
788 * ... buffer space used by the 16-bit side glue for temp copies
790 * (ebx+4) far return address to 16-bit side glue code
791 * (ebx) saved 16-bit ss:sp (pointing to ebx+4)
793 * The 32-bit side glue code accesses both the original arguments (via ebp)
794 * and the temporary copies prepared by the 16-bit side glue (via ebx).
795 * After completion, the stub will load ss:sp from the buffer at ebx
796 * and perform a far return to 16-bit code.
798 * To trick the relay stub into returning to us, we replace the 16-bit
799 * return address to the glue code by a cs:ip pair pointing to our
800 * return entry point (the original return address is saved first).
801 * Our return stub thus called will then reload the 32-bit ss:esp and
802 * return to 32-bit code (by using and ss:esp value that we have also
803 * pushed onto the 16-bit stack before and a cs:eip values found at
804 * that position on the 32-bit stack). The ss:esp to be restored is
805 * found relative to the 16-bit stack pointer at:
808 * (ebx-8) sp (32-bit stack pointer)
810 * The second variant of this routine, CALL32_CBClientEx, which is used
811 * to implement KERNEL.621, has to cope with yet another problem: Here,
812 * the 32-bit side directly returns to the caller of the CBClient thunklet,
813 * restoring registers saved by CBClientGlueSL and cleaning up the stack.
814 * As we have to return to our 32-bit code first, we have to adapt the
815 * layout of our temporary area so as to include values for the registers
816 * that are to be restored, and later (in the implementation of KERNEL.621)
817 * we *really* restore them. The return stub restores DS, DI, SI, and BP
818 * from the stack, skips the next 8 bytes (CBClient relay code / target),
819 * and then performs a lret NN, where NN is the number of arguments to be
820 * removed. Thus, we prepare our temporary area as follows:
822 * (ebx+22) 16-bit cs (this segment)
823 * (ebx+20) 16-bit ip ('16-bit' return entry point)
824 * (ebx+16) 32-bit ss (flat)
825 * (ebx+12) 32-bit sp (32-bit stack pointer)
826 * (ebx+10) 16-bit bp (points to ebx+24)
827 * (ebx+8) 16-bit si (ignored)
828 * (ebx+6) 16-bit di (ignored)
829 * (ebx+4) 16-bit ds (we actually use the flat DS here)
830 * (ebx+2) 16-bit ss (16-bit stack segment)
831 * (ebx+0) 16-bit sp (points to ebx+4)
833 * Note that we ensure that DS is not changed and remains the flat segment,
834 * and the 32-bit stack pointer our own return stub needs fits just
835 * perfectly into the 8 bytes that are skipped by the Windows stub.
836 * One problem is that we have to determine the number of removed arguments,
837 * as these have to be really removed in KERNEL.621. Thus, the BP value
838 * that we place in the temporary area to be restored, contains the value
839 * that SP would have if no arguments were removed. By comparing the actual
840 * value of SP with this value in our return stub we can compute the number
841 * of removed arguments. This is then returned to KERNEL.621.
843 * The stack layout of this function:
844 * (ebp+20) nArgs pointer to variable receiving nr. of args (Ex only)
845 * (ebp+16) esi pointer to caller's esi value
846 * (ebp+12) arg ebp value to be set for relay stub
847 * (ebp+8) func CBClient relay stub address
851 static void BuildCallTo32CBClient( FILE *outfile, BOOL isEx )
853 char *name = isEx? "CBClientEx" : "CBClient";
854 int size = isEx? 24 : 12;
856 /* Function header */
858 fprintf( outfile, "\n\t.align %d\n", get_alignment(4) );
860 fprintf( outfile, ".stabs \"CALL32_%s:F1\",36,0,0," PREFIX "CALL32_%s\n", name, name );
861 fprintf( outfile, "\t.globl " PREFIX "CALL32_%s\n", name );
862 fprintf( outfile, PREFIX "CALL32_%s:\n", name );
866 fprintf( outfile, "\tpushl %%ebp\n" );
867 fprintf( outfile, "\tmovl %%esp,%%ebp\n" );
868 fprintf( outfile, "\tpushl %%edi\n" );
869 fprintf( outfile, "\tpushl %%esi\n" );
870 fprintf( outfile, "\tpushl %%ebx\n" );
872 /* Get the 16-bit stack */
874 fprintf( outfile, "\t.byte 0x64\n\tmovl (%d),%%ebx\n", STACKOFFSET);
876 /* Convert it to a flat address */
878 fprintf( outfile, "\tshldl $16,%%ebx,%%eax\n" );
879 fprintf( outfile, "\tandl $0xfff8,%%eax\n" );
880 fprintf( outfile, "\tshrl $1,%%eax\n" );
881 fprintf( outfile, "\tmovl " PREFIX "wine_ldt_copy(%%eax),%%esi\n" );
882 fprintf( outfile, "\tmovw %%bx,%%ax\n" );
883 fprintf( outfile, "\taddl %%eax,%%esi\n" );
885 /* Allocate temporary area (simulate STACK16_PUSH) */
887 fprintf( outfile, "\tpushf\n" );
888 fprintf( outfile, "\tcld\n" );
889 fprintf( outfile, "\tleal -%d(%%esi), %%edi\n", size );
890 fprintf( outfile, "\tmovl $%d, %%ecx\n", sizeof(STACK16FRAME) );
891 fprintf( outfile, "\trep\n\tmovsb\n" );
892 fprintf( outfile, "\tpopf\n" );
894 fprintf( outfile, "\t.byte 0x64\n\tsubw $%d,(%d)\n", size, STACKOFFSET );
896 fprintf( outfile, "\tpushl %%edi\n" ); /* remember address */
898 /* Set up temporary area */
902 fprintf( outfile, "\tleal 4(%%edi), %%edi\n" );
904 fprintf( outfile, "\tleal -8(%%esp), %%eax\n" );
905 fprintf( outfile, "\tmovl %%eax, -8(%%edi)\n" ); /* 32-bit sp */
907 fprintf( outfile, "\tmovw %%ss, %%ax\n" );
908 fprintf( outfile, "\tandl $0x0000ffff, %%eax\n" );
909 fprintf( outfile, "\tmovl %%eax, -4(%%edi)\n" ); /* 32-bit ss */
911 fprintf( outfile, "\taddl $%d, %%ebx\n", sizeof(STACK16FRAME)-size+4 + 4 );
912 fprintf( outfile, "\tmovl %%ebx, 0(%%edi)\n" ); /* 16-bit ss:sp */
914 fprintf( outfile, "\tmovl " PREFIX "CALL32_%s_RetAddr, %%eax\n", name );
915 fprintf( outfile, "\tmovl %%eax, 4(%%edi)\n" ); /* overwrite return address */
919 fprintf( outfile, "\taddl $%d, %%ebx\n", sizeof(STACK16FRAME)-size+4 );
920 fprintf( outfile, "\tmovl %%ebx, 0(%%edi)\n" );
922 fprintf( outfile, "\tmovw %%ds, %%ax\n" );
923 fprintf( outfile, "\tmovw %%ax, 4(%%edi)\n" );
925 fprintf( outfile, "\taddl $20, %%ebx\n" );
926 fprintf( outfile, "\tmovw %%bx, 10(%%edi)\n" );
928 fprintf( outfile, "\tleal -8(%%esp), %%eax\n" );
929 fprintf( outfile, "\tmovl %%eax, 12(%%edi)\n" );
931 fprintf( outfile, "\tmovw %%ss, %%ax\n" );
932 fprintf( outfile, "\tandl $0x0000ffff, %%eax\n" );
933 fprintf( outfile, "\tmovl %%eax, 16(%%edi)\n" );
935 fprintf( outfile, "\tmovl " PREFIX "CALL32_%s_RetAddr, %%eax\n", name );
936 fprintf( outfile, "\tmovl %%eax, 20(%%edi)\n" );
939 /* Set up registers and call CBClient relay stub (simulating a far call) */
941 fprintf( outfile, "\tmovl 16(%%ebp), %%esi\n" );
942 fprintf( outfile, "\tmovl (%%esi), %%esi\n" );
944 fprintf( outfile, "\tmovl %%edi, %%ebx\n" );
945 fprintf( outfile, "\tmovl 8(%%ebp), %%eax\n" );
946 fprintf( outfile, "\tmovl 12(%%ebp), %%ebp\n" );
948 fprintf( outfile, "\tpushl %%cs\n" );
949 fprintf( outfile, "\tcall *%%eax\n" );
951 /* Return new esi value to caller */
953 fprintf( outfile, "\tmovl 32(%%esp), %%edi\n" );
954 fprintf( outfile, "\tmovl %%esi, (%%edi)\n" );
956 /* Cleanup temporary area (simulate STACK16_POP) */
958 fprintf( outfile, "\tpop %%esi\n" );
960 fprintf( outfile, "\tpushf\n" );
961 fprintf( outfile, "\tstd\n" );
962 fprintf( outfile, "\tdec %%esi\n" );
963 fprintf( outfile, "\tleal %d(%%esi), %%edi\n", size );
964 fprintf( outfile, "\tmovl $%d, %%ecx\n", sizeof(STACK16FRAME) );
965 fprintf( outfile, "\trep\n\tmovsb\n" );
966 fprintf( outfile, "\tpopf\n" );
968 fprintf( outfile, "\t.byte 0x64\n\taddw $%d,(%d)\n", size, STACKOFFSET );
970 /* Return argument size to caller */
973 fprintf( outfile, "\tmovl 32(%%esp), %%ebx\n" );
974 fprintf( outfile, "\tmovl %%ebp, (%%ebx)\n" );
977 /* Restore registers and return */
979 fprintf( outfile, "\tpopl %%ebx\n" );
980 fprintf( outfile, "\tpopl %%esi\n" );
981 fprintf( outfile, "\tpopl %%edi\n" );
982 fprintf( outfile, "\tpopl %%ebp\n" );
983 fprintf( outfile, "\tret\n" );
986 static void BuildCallTo32CBClientRet( FILE *outfile, BOOL isEx )
988 char *name = isEx? "CBClientEx" : "CBClient";
990 /* '16-bit' return stub */
992 fprintf( outfile, "\n\t.globl " PREFIX "CALL32_%s_Ret\n", name );
993 fprintf( outfile, PREFIX "CALL32_%s_Ret:\n", name );
997 fprintf( outfile, "\tmovzwl %%sp, %%ebx\n" );
998 fprintf( outfile, "\tlssl %%ss:-16(%%ebx), %%esp\n" );
1002 fprintf( outfile, "\tmovzwl %%bp, %%ebx\n" );
1003 fprintf( outfile, "\tsubw %%bp, %%sp\n" );
1004 fprintf( outfile, "\tmovzwl %%sp, %%ebp\n" );
1005 fprintf( outfile, "\tlssl %%ss:-12(%%ebx), %%esp\n" );
1007 fprintf( outfile, "\tlret\n" );
1009 /* Declare the return address variable */
1011 fprintf( outfile, "\n\t.globl " PREFIX "CALL32_%s_RetAddr\n", name );
1012 fprintf( outfile, PREFIX "CALL32_%s_RetAddr:\t.long 0\n", name );
1016 /*******************************************************************
1017 * BuildCallFrom32Regs
1019 * Build a 32-bit-to-Wine call-back function for a 'register' function.
1020 * 'args' is the number of dword arguments.
1024 * (ebp+12) first arg
1025 * (ebp+8) ret addr to user code
1026 * (ebp+4) ret addr to relay code
1028 * (ebp-128) buffer area to allow stack frame manipulation
1029 * (ebp-332) CONTEXT86 struct
1030 * (ebp-336) CONTEXT86 *argument
1031 * .... other arguments copied from (ebp+12)
1033 * The entry point routine is called with a CONTEXT* extra argument,
1034 * following the normal args. In this context structure, EIP_reg
1035 * contains the return address to user code, and ESP_reg the stack
1036 * pointer on return (with the return address and arguments already
1039 static void BuildCallFrom32Regs( FILE *outfile )
1041 static const int STACK_SPACE = 128 + sizeof(CONTEXT86);
1043 /* Function header */
1045 function_header( outfile, "__wine_call_from_32_regs" );
1047 /* Allocate some buffer space on the stack */
1049 fprintf( outfile, "\tpushl %%ebp\n" );
1050 fprintf( outfile, "\tmovl %%esp,%%ebp\n ");
1051 fprintf( outfile, "\tleal -%d(%%esp), %%esp\n", STACK_SPACE );
1053 /* Build the context structure */
1055 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Eax) - STACK_SPACE );
1056 fprintf( outfile, "\tpushfl\n" );
1057 fprintf( outfile, "\tpopl %%eax\n" );
1058 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(EFlags) - STACK_SPACE );
1059 fprintf( outfile, "\tmovl 0(%%ebp),%%eax\n" );
1060 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Ebp) - STACK_SPACE );
1061 fprintf( outfile, "\tmovl %%ebx,%d(%%ebp)\n", CONTEXTOFFSET(Ebx) - STACK_SPACE );
1062 fprintf( outfile, "\tmovl %%ecx,%d(%%ebp)\n", CONTEXTOFFSET(Ecx) - STACK_SPACE );
1063 fprintf( outfile, "\tmovl %%edx,%d(%%ebp)\n", CONTEXTOFFSET(Edx) - STACK_SPACE );
1064 fprintf( outfile, "\tmovl %%esi,%d(%%ebp)\n", CONTEXTOFFSET(Esi) - STACK_SPACE );
1065 fprintf( outfile, "\tmovl %%edi,%d(%%ebp)\n", CONTEXTOFFSET(Edi) - STACK_SPACE );
1067 fprintf( outfile, "\txorl %%eax,%%eax\n" );
1068 fprintf( outfile, "\tmovw %%cs,%%ax\n" );
1069 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegCs) - STACK_SPACE );
1070 fprintf( outfile, "\tmovw %%es,%%ax\n" );
1071 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegEs) - STACK_SPACE );
1072 fprintf( outfile, "\tmovw %%fs,%%ax\n" );
1073 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegFs) - STACK_SPACE );
1074 fprintf( outfile, "\tmovw %%gs,%%ax\n" );
1075 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegGs) - STACK_SPACE );
1076 fprintf( outfile, "\tmovw %%ss,%%ax\n" );
1077 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegSs) - STACK_SPACE );
1078 fprintf( outfile, "\tmovw %%ds,%%ax\n" );
1079 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegDs) - STACK_SPACE );
1080 fprintf( outfile, "\tmovw %%ax,%%es\n" ); /* set %es equal to %ds just in case */
1082 fprintf( outfile, "\tmovl $0x%x,%%eax\n", CONTEXT86_FULL );
1083 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(ContextFlags) - STACK_SPACE );
1085 fprintf( outfile, "\tmovl 8(%%ebp),%%eax\n" ); /* Get %eip at time of call */
1086 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Eip) - STACK_SPACE );
1088 /* Transfer the arguments */
1090 fprintf( outfile, "\tmovl 4(%%ebp),%%ebx\n" ); /* get relay code addr */
1091 fprintf( outfile, "\tpushl %%esp\n" ); /* push ptr to context struct */
1092 fprintf( outfile, "\tmovzbl 4(%%ebx),%%ecx\n" ); /* fetch number of args to copy */
1093 fprintf( outfile, "\tjecxz 1f\n" );
1094 fprintf( outfile, "\tsubl %%ecx,%%esp\n" );
1095 fprintf( outfile, "\tleal 12(%%ebp),%%esi\n" ); /* get %esp at time of call */
1096 fprintf( outfile, "\tmovl %%esp,%%edi\n" );
1097 fprintf( outfile, "\tshrl $2,%%ecx\n" );
1098 fprintf( outfile, "\tcld\n" );
1099 fprintf( outfile, "\trep\n\tmovsl\n" ); /* copy args */
1101 fprintf( outfile, "1:\tmovzbl 5(%%ebx),%%eax\n" ); /* fetch number of args to remove */
1102 fprintf( outfile, "\tleal 12(%%ebp,%%eax),%%eax\n" );
1103 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Esp) - STACK_SPACE );
1105 /* Call the entry point */
1107 fprintf( outfile, "\tcall *0(%%ebx)\n" );
1109 /* Store %eip and %ebp onto the new stack */
1111 fprintf( outfile, "\tmovl %d(%%ebp),%%edx\n", CONTEXTOFFSET(Esp) - STACK_SPACE );
1112 fprintf( outfile, "\tmovl %d(%%ebp),%%eax\n", CONTEXTOFFSET(Eip) - STACK_SPACE );
1113 fprintf( outfile, "\tmovl %%eax,-4(%%edx)\n" );
1114 fprintf( outfile, "\tmovl %d(%%ebp),%%eax\n", CONTEXTOFFSET(Ebp) - STACK_SPACE );
1115 fprintf( outfile, "\tmovl %%eax,-8(%%edx)\n" );
1117 /* Restore the context structure */
1119 /* Note: we don't bother to restore %cs, %ds and %ss
1120 * changing them in 32-bit code is a recipe for disaster anyway
1122 fprintf( outfile, "\tmovl %d(%%ebp),%%eax\n", CONTEXTOFFSET(SegEs) - STACK_SPACE );
1123 fprintf( outfile, "\tmovw %%ax,%%es\n" );
1124 fprintf( outfile, "\tmovl %d(%%ebp),%%eax\n", CONTEXTOFFSET(SegFs) - STACK_SPACE );
1125 fprintf( outfile, "\tmovw %%ax,%%fs\n" );
1126 fprintf( outfile, "\tmovl %d(%%ebp),%%eax\n", CONTEXTOFFSET(SegGs) - STACK_SPACE );
1127 fprintf( outfile, "\tmovw %%ax,%%gs\n" );
1129 fprintf( outfile, "\tmovl %d(%%ebp),%%edi\n", CONTEXTOFFSET(Edi) - STACK_SPACE );
1130 fprintf( outfile, "\tmovl %d(%%ebp),%%esi\n", CONTEXTOFFSET(Esi) - STACK_SPACE );
1131 fprintf( outfile, "\tmovl %d(%%ebp),%%edx\n", CONTEXTOFFSET(Edx) - STACK_SPACE );
1132 fprintf( outfile, "\tmovl %d(%%ebp),%%ecx\n", CONTEXTOFFSET(Ecx) - STACK_SPACE );
1133 fprintf( outfile, "\tmovl %d(%%ebp),%%ebx\n", CONTEXTOFFSET(Ebx) - STACK_SPACE );
1135 fprintf( outfile, "\tmovl %d(%%ebp),%%eax\n", CONTEXTOFFSET(EFlags) - STACK_SPACE );
1136 fprintf( outfile, "\tpushl %%eax\n" );
1137 fprintf( outfile, "\tpopfl\n" );
1138 fprintf( outfile, "\tmovl %d(%%ebp),%%eax\n", CONTEXTOFFSET(Eax) - STACK_SPACE );
1140 fprintf( outfile, "\tmovl %d(%%ebp),%%ebp\n", CONTEXTOFFSET(Esp) - STACK_SPACE );
1141 fprintf( outfile, "\tleal -8(%%ebp),%%esp\n" );
1142 fprintf( outfile, "\tpopl %%ebp\n" );
1143 fprintf( outfile, "\tret\n" );
1147 /*******************************************************************
1150 * Build all the 16-bit relay callbacks
1152 void BuildRelays16( FILE *outfile )
1158 fprintf( outfile, "/* File generated automatically. Do not edit! */\n\n" );
1159 fprintf( outfile, "\t.text\n" );
1161 if (output_file_name && use_stabs)
1163 getcwd(buffer, sizeof(buffer));
1164 fprintf( outfile, "\t.file\t\"%s\"\n", output_file_name );
1167 * The stabs help the internal debugger as they are an indication that it
1168 * is sensible to step into a thunk/trampoline.
1170 fprintf( outfile, ".stabs \"%s/\",100,0,0,Code_Start\n", buffer);
1171 fprintf( outfile, ".stabs \"%s\",100,0,0,Code_Start\n", output_file_name );
1172 fprintf( outfile, "Code_Start:\n\n" );
1175 fprintf( outfile, PREFIX"Call16_Start:\n" );
1176 fprintf( outfile, "\t.globl "PREFIX"Call16_Start\n" );
1177 fprintf( outfile, "\t.byte 0\n\n" );
1179 /* Standard CallFrom16 routine (WORD return) */
1180 BuildCallFrom16Core( outfile, FALSE, FALSE, TRUE );
1182 /* Standard CallFrom16 routine (DWORD return) */
1183 BuildCallFrom16Core( outfile, FALSE, FALSE, FALSE );
1185 /* Register CallFrom16 routine */
1186 BuildCallFrom16Core( outfile, TRUE, FALSE, FALSE );
1188 /* C16ThkSL CallFrom16 routine */
1189 BuildCallFrom16Core( outfile, FALSE, TRUE, FALSE );
1191 /* Standard CallTo16 routine (WORD return) */
1192 BuildCallTo16Core( outfile, TRUE, FALSE );
1194 /* Standard CallTo16 routine (DWORD return) */
1195 BuildCallTo16Core( outfile, FALSE, FALSE );
1197 /* Register CallTo16 routine (16:16 retf) */
1198 BuildCallTo16Core( outfile, FALSE, 1 );
1200 /* Register CallTo16 routine (16:32 retf) */
1201 BuildCallTo16Core( outfile, FALSE, 2 );
1203 /* CBClientThunkSL routine */
1204 BuildCallTo32CBClient( outfile, FALSE );
1206 /* CBClientThunkSLEx routine */
1207 BuildCallTo32CBClient( outfile, TRUE );
1209 fprintf( outfile, PREFIX"Call16_End:\n" );
1210 fprintf( outfile, "\t.globl "PREFIX"Call16_End\n" );
1214 fprintf( outfile, "\t.stabs \"\",100,0,0,.Letext\n");
1215 fprintf( outfile, ".Letext:\n");
1217 /* Some versions of gdb need to have the filename data for
1218 each section, so output it again for the data section. */
1219 if (output_file_name)
1221 fprintf( outfile, ".stabs \"%s/\",100,0,0,Data_Start\n", buffer);
1222 fprintf( outfile, ".stabs \"%s\",100,0,0,Data_Start\n", output_file_name );
1223 fprintf( outfile, "Data_Start:\n\n" );
1227 /* The whole Call16_Ret segment must lie within the .data section */
1228 fprintf( outfile, "\n\t.data\n" );
1229 fprintf( outfile, "\t.globl " PREFIX "Call16_Ret_Start\n" );
1230 fprintf( outfile, PREFIX "Call16_Ret_Start:\n" );
1232 /* Standard CallTo16 return stub */
1233 BuildRet16Func( outfile );
1235 /* CBClientThunkSL return stub */
1236 BuildCallTo32CBClientRet( outfile, FALSE );
1238 /* CBClientThunkSLEx return stub */
1239 BuildCallTo32CBClientRet( outfile, TRUE );
1241 /* End of Call16_Ret segment */
1242 fprintf( outfile, "\n\t.globl " PREFIX "Call16_Ret_End\n" );
1243 fprintf( outfile, PREFIX "Call16_Ret_End:\n" );
1246 /*******************************************************************
1249 * Build all the 32-bit relay callbacks
1251 void BuildRelays32( FILE *outfile )
1255 fprintf( outfile, "/* File generated automatically. Do not edit! */\n\n" );
1256 fprintf( outfile, "\t.text\n" );
1258 if (output_file_name && use_stabs)
1261 getcwd(buffer, sizeof(buffer));
1262 fprintf( outfile, "\t.file\t\"%s\"\n", output_file_name );
1265 * The stabs help the internal debugger as they are an indication that it
1266 * is sensible to step into a thunk/trampoline.
1268 fprintf( outfile, ".stabs \"%s/\",100,0,0,Code_Start\n", buffer);
1269 fprintf( outfile, ".stabs \"%s\",100,0,0,Code_Start\n", output_file_name );
1270 fprintf( outfile, "Code_Start:\n\n" );
1273 /* 32-bit register entry point */
1274 BuildCallFrom32Regs( outfile );
1278 fprintf( outfile, "\t.stabs \"\",100,0,0,.Letext\n");
1279 fprintf( outfile, ".Letext:\n");
1283 #else /* __i386__ */
1285 void BuildRelays16( FILE *outfile )
1287 fprintf( outfile, "/* File not used with this architecture. Do not edit! */\n\n" );
1290 void BuildRelays32( FILE *outfile )
1292 fprintf( outfile, "/* File not used with this architecture. Do not edit! */\n\n" );
1295 #endif /* __i386__ */