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Fixed tmpfile buffer size.
[wine.git] / tools / winebuild / relay.c
blobd999753d8de27e758dc1aad310bc79d67a83f3fe
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
11 #include <ctype.h>
12 #include <unistd.h>
13
14 #include "config.h"
15 #include "winnt.h"
16 #include "thread.h"
17 #include "stackframe.h"
18
19 #include "build.h"
20
21 #ifdef __i386__
22
23 /*******************************************************************
24 * BuildCallFrom16Core
25 *
26 * This routine builds the core routines used in 16->32 thunks:
27 * CallFrom16Word, CallFrom16Long, CallFrom16Register, and CallFrom16Thunk.
28 *
29 * These routines are intended to be called via a far call (with 32-bit
30 * operand size) from 16-bit code. The 16-bit code stub must push %bp,
31 * the 32-bit entry point to be called, and the argument conversion
32 * routine to be used (see stack layout below).
33 *
34 * The core routine completes the STACK16FRAME on the 16-bit stack and
35 * switches to the 32-bit stack. Then, the argument conversion routine
36 * is called; it gets passed the 32-bit entry point and a pointer to the
37 * 16-bit arguments (on the 16-bit stack) as parameters. (You can either
38 * use conversion routines automatically generated by BuildCallFrom16,
39 * or write your own for special purposes.)
40 *
41 * The conversion routine must call the 32-bit entry point, passing it
42 * the converted arguments, and return its return value to the core.
43 * After the conversion routine has returned, the core switches back
44 * to the 16-bit stack, converts the return value to the DX:AX format
45 * (CallFrom16Long), and returns to the 16-bit call stub. All parameters,
46 * including %bp, are popped off the stack.
47 *
48 * The 16-bit call stub now returns to the caller, popping the 16-bit
49 * arguments if necessary (pascal calling convention).
50 *
51 * In the case of a 'register' function, CallFrom16Register fills a
52 * CONTEXT86 structure with the values all registers had at the point
53 * the first instruction of the 16-bit call stub was about to be
54 * executed. A pointer to this CONTEXT86 is passed as third parameter
55 * to the argument conversion routine, which typically passes it on
56 * to the called 32-bit entry point.
57 *
58 * CallFrom16Thunk is a special variant used by the implementation of
59 * the Win95 16->32 thunk functions C16ThkSL and C16ThkSL01 and is
60 * implemented as follows:
61 * On entry, the EBX register is set up to contain a flat pointer to the
62 * 16-bit stack such that EBX+22 points to the first argument.
63 * Then, the entry point is called, while EBP is set up to point
64 * to the return address (on the 32-bit stack).
65 * The called function returns with CX set to the number of bytes
66 * to be popped of the caller's stack.
67 *
68 * Stack layout upon entry to the core routine (STACK16FRAME):
69 * ... ...
70 * (sp+24) word first 16-bit arg
71 * (sp+22) word cs
72 * (sp+20) word ip
73 * (sp+18) word bp
74 * (sp+14) long 32-bit entry point (reused for Win16 mutex recursion count)
75 * (sp+12) word ip of actual entry point (necessary for relay debugging)
76 * (sp+8) long relay (argument conversion) function entry point
77 * (sp+4) long cs of 16-bit entry point
78 * (sp) long ip of 16-bit entry point
79 *
80 * Added on the stack:
81 * (sp-2) word saved gs
82 * (sp-4) word saved fs
83 * (sp-6) word saved es
84 * (sp-8) word saved ds
85 * (sp-12) long saved ebp
86 * (sp-16) long saved ecx
87 * (sp-20) long saved edx
88 * (sp-24) long saved previous stack
89 */
90 static void BuildCallFrom16Core( FILE *outfile, int reg_func, int thunk, int short_ret )
91 {
92 char *name = thunk? "thunk" : reg_func? "regs" : short_ret? "word" : "long";
93
94 /* Function header */
95 fprintf( outfile, "\n\t.align 4\n" );
96 #ifdef USE_STABS
97 fprintf( outfile, ".stabs \"__wine_call_from_16_%s:F1\",36,0,0," PREFIX "__wine_call_from_16_%s\n", name, name);
98 #endif
99 fprintf( outfile, "\t" __ASM_FUNC("__wine_call_from_16_%s") "\n", name );
100 fprintf( outfile, "\t.globl " PREFIX "__wine_call_from_16_%s\n", name );
101 fprintf( outfile, PREFIX "__wine_call_from_16_%s:\n", name );
102
103 /* Create STACK16FRAME (except STACK32FRAME link) */
104 fprintf( outfile, "\tpushw %%gs\n" );
105 fprintf( outfile, "\tpushw %%fs\n" );
106 fprintf( outfile, "\tpushw %%es\n" );
107 fprintf( outfile, "\tpushw %%ds\n" );
108 fprintf( outfile, "\tpushl %%ebp\n" );
109 fprintf( outfile, "\tpushl %%ecx\n" );
110 fprintf( outfile, "\tpushl %%edx\n" );
111
112 /* Save original EFlags register */
113 fprintf( outfile, "\tpushfl\n" );
114
115 if ( UsePIC )
116 {
117 /* Get Global Offset Table into %ecx */
118 fprintf( outfile, "\tcall .L__wine_call_from_16_%s.getgot1\n", name );
119 fprintf( outfile, ".L__wine_call_from_16_%s.getgot1:\n", name );
120 fprintf( outfile, "\tpopl %%ecx\n" );
121 fprintf( outfile, "\taddl $_GLOBAL_OFFSET_TABLE_+[.-.L__wine_call_from_16_%s.getgot1], %%ecx\n", name );
122 }
123
124 if (UsePIC)
125 {
126 fprintf( outfile, "\t.byte 0x2e\n\tmovl " PREFIX "CallTo16_DataSelector@GOT(%%ecx), %%edx\n" );
127 fprintf( outfile, "\t.byte 0x2e\n\tmovl (%%edx), %%edx\n" );
128 }
129 else
130 fprintf( outfile, "\t.byte 0x2e\n\tmovl " PREFIX "CallTo16_DataSelector,%%edx\n" );
131
132 /* Load 32-bit segment registers */
133 #ifdef __svr4__
134 fprintf( outfile, "\tdata16\n");
135 #endif
136 fprintf( outfile, "\tmovw %%dx, %%ds\n" );
137 #ifdef __svr4__
138 fprintf( outfile, "\tdata16\n");
139 #endif
140 fprintf( outfile, "\tmovw %%dx, %%es\n" );
141
142 if ( UsePIC )
143 {
144 fprintf( outfile, "\tmovl " PREFIX "SYSLEVEL_Win16CurrentTeb@GOT(%%ecx), %%edx\n" );
145 fprintf( outfile, "\tmovw (%%edx), %%fs\n" );
146 }
147 else
148 fprintf( outfile, "\tmovw " PREFIX "SYSLEVEL_Win16CurrentTeb, %%fs\n" );
149
150 /* Get address of wine_ldt_copy array into %ecx */
151 if ( UsePIC )
152 fprintf( outfile, "\tmovl " PREFIX "wine_ldt_copy@GOT(%%ecx), %%ecx\n" );
153 else
154 fprintf( outfile, "\tmovl $" PREFIX "wine_ldt_copy, %%ecx\n" );
155
156 /* Translate STACK16FRAME base to flat offset in %edx */
157 fprintf( outfile, "\tmovw %%ss, %%dx\n" );
158 fprintf( outfile, "\tandl $0xfff8, %%edx\n" );
159 fprintf( outfile, "\tshrl $1, %%edx\n" );
160 fprintf( outfile, "\tmovl (%%ecx,%%edx), %%edx\n" );
161 fprintf( outfile, "\tmovzwl %%sp, %%ebp\n" );
162 fprintf( outfile, "\tleal (%%ebp,%%edx), %%edx\n" );
163
164 /* Get saved flags into %ecx */
165 fprintf( outfile, "\tpopl %%ecx\n" );
166
167 /* Get the 32-bit stack pointer from the TEB and complete STACK16FRAME */
168 fprintf( outfile, "\t.byte 0x64\n\tmovl (%d), %%ebp\n", STACKOFFSET );
169 fprintf( outfile, "\tpushl %%ebp\n" );
170
171 /* Switch stacks */
172 #ifdef __svr4__
173 fprintf( outfile,"\tdata16\n");
174 #endif
175 fprintf( outfile, "\t.byte 0x64\n\tmovw %%ss, (%d)\n", STACKOFFSET + 2 );
176 fprintf( outfile, "\t.byte 0x64\n\tmovw %%sp, (%d)\n", STACKOFFSET );
177 fprintf( outfile, "\tpushl %%ds\n" );
178 fprintf( outfile, "\tpopl %%ss\n" );
179 fprintf( outfile, "\tmovl %%ebp, %%esp\n" );
180 fprintf( outfile, "\taddl $%d, %%ebp\n", STRUCTOFFSET(STACK32FRAME, ebp) );
181
182
183 /* At this point:
184 STACK16FRAME is completely set up
185 DS, ES, SS: flat data segment
186 FS: current TEB
187 ESP: points to last STACK32FRAME
188 EBP: points to ebp member of last STACK32FRAME
189 EDX: points to current STACK16FRAME
190 ECX: contains saved flags
191 all other registers: unchanged */
192
193 /* Special case: C16ThkSL stub */
194 if ( thunk )
195 {
196 /* Set up registers as expected and call thunk */
197 fprintf( outfile, "\tleal %d(%%edx), %%ebx\n", sizeof(STACK16FRAME)-22 );
198 fprintf( outfile, "\tleal -4(%%esp), %%ebp\n" );
199
200 fprintf( outfile, "\tcall *%d(%%edx)\n", STACK16OFFSET(entry_point) );
201
202 /* Switch stack back */
203 /* fprintf( outfile, "\t.byte 0x64\n\tlssw (%d), %%sp\n", STACKOFFSET ); */
204 fprintf( outfile, "\t.byte 0x64,0x66,0x0f,0xb2,0x25\n\t.long %d\n", STACKOFFSET );
205 fprintf( outfile, "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
206
207 /* Restore registers and return directly to caller */
208 fprintf( outfile, "\taddl $8, %%esp\n" );
209 fprintf( outfile, "\tpopl %%ebp\n" );
210 fprintf( outfile, "\tpopw %%ds\n" );
211 fprintf( outfile, "\tpopw %%es\n" );
212 fprintf( outfile, "\tpopw %%fs\n" );
213 fprintf( outfile, "\tpopw %%gs\n" );
214 fprintf( outfile, "\taddl $20, %%esp\n" );
215
216 fprintf( outfile, "\txorb %%ch, %%ch\n" );
217 fprintf( outfile, "\tpopl %%ebx\n" );
218 fprintf( outfile, "\taddw %%cx, %%sp\n" );
219 fprintf( outfile, "\tpush %%ebx\n" );
220
221 fprintf( outfile, "\t.byte 0x66\n" );
222 fprintf( outfile, "\tlret\n" );
223
224 return;
225 }
226
227
228 /* Build register CONTEXT */
229 if ( reg_func )
230 {
231 fprintf( outfile, "\tsubl $%d, %%esp\n", sizeof(CONTEXT86) );
232
233 fprintf( outfile, "\tmovl %%ecx, %d(%%esp)\n", CONTEXTOFFSET(EFlags) );
234
235 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Eax) );
236 fprintf( outfile, "\tmovl %%ebx, %d(%%esp)\n", CONTEXTOFFSET(Ebx) );
237 fprintf( outfile, "\tmovl %%esi, %d(%%esp)\n", CONTEXTOFFSET(Esi) );
238 fprintf( outfile, "\tmovl %%edi, %d(%%esp)\n", CONTEXTOFFSET(Edi) );
239
240 fprintf( outfile, "\tmovl %d(%%edx), %%eax\n", STACK16OFFSET(ebp) );
241 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Ebp) );
242 fprintf( outfile, "\tmovl %d(%%edx), %%eax\n", STACK16OFFSET(ecx) );
243 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Ecx) );
244 fprintf( outfile, "\tmovl %d(%%edx), %%eax\n", STACK16OFFSET(edx) );
245 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Edx) );
246
247 fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(ds) );
248 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegDs) );
249 fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(es) );
250 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegEs) );
251 fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(fs) );
252 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegFs) );
253 fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(gs) );
254 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegGs) );
255
256 fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(cs) );
257 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegCs) );
258 fprintf( outfile, "\tmovzwl %d(%%edx), %%eax\n", STACK16OFFSET(ip) );
259 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Eip) );
260
261 fprintf( outfile, "\t.byte 0x64\n\tmovzwl (%d), %%eax\n", STACKOFFSET+2 );
262 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(SegSs) );
263 fprintf( outfile, "\t.byte 0x64\n\tmovzwl (%d), %%eax\n", STACKOFFSET );
264 fprintf( outfile, "\taddl $%d, %%eax\n", STACK16OFFSET(ip) );
265 fprintf( outfile, "\tmovl %%eax, %d(%%esp)\n", CONTEXTOFFSET(Esp) );
266 #if 0
267 fprintf( outfile, "\tfsave %d(%%esp)\n", CONTEXTOFFSET(FloatSave) );
268 #endif
269
270 /* Push address of CONTEXT86 structure -- popped by the relay routine */
271 fprintf( outfile, "\tpushl %%esp\n" );
272 }
273
274
275 /* Print debug info before call */
276 if ( debugging )
277 {
278 if ( UsePIC )
279 {
280 fprintf( outfile, "\tpushl %%ebx\n" );
281
282 /* Get Global Offset Table into %ebx (for PLT call) */
283 fprintf( outfile, "\tcall .L__wine_call_from_16_%s.getgot2\n", name );
284 fprintf( outfile, ".L__wine_call_from_16_%s.getgot2:\n", name );
285 fprintf( outfile, "\tpopl %%ebx\n" );
286 fprintf( outfile, "\taddl $_GLOBAL_OFFSET_TABLE_+[.-.L__wine_call_from_16_%s.getgot2], %%ebx\n", name );
287 }
288
289 fprintf( outfile, "\tpushl %%edx\n" );
290 if ( reg_func )
291 fprintf( outfile, "\tleal -%d(%%ebp), %%eax\n\tpushl %%eax\n",
292 sizeof(CONTEXT) + STRUCTOFFSET(STACK32FRAME, ebp) );
293 else
294 fprintf( outfile, "\tpushl $0\n" );
295
296 if ( UsePIC )
297 fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallFrom16@PLT\n ");
298 else
299 fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallFrom16\n ");
300
301 fprintf( outfile, "\tpopl %%edx\n" );
302 fprintf( outfile, "\tpopl %%edx\n" );
303
304 if ( UsePIC )
305 fprintf( outfile, "\tpopl %%ebx\n" );
306 }
307
308 /* Call relay routine (which will call the API entry point) */
309 fprintf( outfile, "\tleal %d(%%edx), %%eax\n", sizeof(STACK16FRAME) );
310 fprintf( outfile, "\tpushl %%eax\n" );
311 fprintf( outfile, "\tpushl %d(%%edx)\n", STACK16OFFSET(entry_point) );
312 fprintf( outfile, "\tcall *%d(%%edx)\n", STACK16OFFSET(relay) );
313
314 /* Print debug info after call */
315 if ( debugging )
316 {
317 if ( UsePIC )
318 {
319 fprintf( outfile, "\tpushl %%ebx\n" );
320
321 /* Get Global Offset Table into %ebx (for PLT call) */
322 fprintf( outfile, "\tcall .L__wine_call_from_16_%s.getgot3\n", name );
323 fprintf( outfile, ".L__wine_call_from_16_%s.getgot3:\n", name );
324 fprintf( outfile, "\tpopl %%ebx\n" );
325 fprintf( outfile, "\taddl $_GLOBAL_OFFSET_TABLE_+[.-.L__wine_call_from_16_%s.getgot3], %%ebx\n", name );
326 }
327
328 fprintf( outfile, "\tpushl %%eax\n" );
329 if ( reg_func )
330 fprintf( outfile, "\tleal -%d(%%ebp), %%eax\n\tpushl %%eax\n",
331 sizeof(CONTEXT) + STRUCTOFFSET(STACK32FRAME, ebp) );
332 else
333 fprintf( outfile, "\tpushl $0\n" );
334
335 if ( UsePIC )
336 fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallFrom16Ret@PLT\n ");
337 else
338 fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallFrom16Ret\n ");
339
340 fprintf( outfile, "\tpopl %%eax\n" );
341 fprintf( outfile, "\tpopl %%eax\n" );
342
343 if ( UsePIC )
344 fprintf( outfile, "\tpopl %%ebx\n" );
345 }
346
347
348 if ( reg_func )
349 {
350 fprintf( outfile, "\tmovl %%esp, %%ebx\n" );
351
352 /* Switch stack back */
353 /* fprintf( outfile, "\t.byte 0x64\n\tlssw (%d), %%sp\n", STACKOFFSET ); */
354 fprintf( outfile, "\t.byte 0x64,0x66,0x0f,0xb2,0x25\n\t.long %d\n", STACKOFFSET );
355 fprintf( outfile, "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
356
357 /* Get return address to CallFrom16 stub */
358 fprintf( outfile, "\taddw $%d, %%sp\n", STACK16OFFSET(callfrom_ip)-4 );
359 fprintf( outfile, "\tpopl %%eax\n" );
360 fprintf( outfile, "\tpopl %%edx\n" );
361
362 /* Restore all registers from CONTEXT */
363 fprintf( outfile, "\tmovw %d(%%ebx), %%ss\n", CONTEXTOFFSET(SegSs) );
364 fprintf( outfile, "\tmovl %d(%%ebx), %%esp\n", CONTEXTOFFSET(Esp) );
365 fprintf( outfile, "\taddl $4, %%esp\n" ); /* room for final return address */
366
367 fprintf( outfile, "\tpushw %d(%%ebx)\n", CONTEXTOFFSET(SegCs) );
368 fprintf( outfile, "\tpushw %d(%%ebx)\n", CONTEXTOFFSET(Eip) );
369 fprintf( outfile, "\tpushl %%edx\n" );
370 fprintf( outfile, "\tpushl %%eax\n" );
371 fprintf( outfile, "\tpushl %d(%%ebx)\n", CONTEXTOFFSET(EFlags) );
372 fprintf( outfile, "\tpushl %d(%%ebx)\n", CONTEXTOFFSET(SegDs) );
373
374 fprintf( outfile, "\tmovw %d(%%ebx), %%es\n", CONTEXTOFFSET(SegEs) );
375 fprintf( outfile, "\tmovw %d(%%ebx), %%fs\n", CONTEXTOFFSET(SegFs) );
376 fprintf( outfile, "\tmovw %d(%%ebx), %%gs\n", CONTEXTOFFSET(SegGs) );
377
378 fprintf( outfile, "\tmovl %d(%%ebx), %%ebp\n", CONTEXTOFFSET(Ebp) );
379 fprintf( outfile, "\tmovl %d(%%ebx), %%esi\n", CONTEXTOFFSET(Esi) );
380 fprintf( outfile, "\tmovl %d(%%ebx), %%edi\n", CONTEXTOFFSET(Edi) );
381 fprintf( outfile, "\tmovl %d(%%ebx), %%eax\n", CONTEXTOFFSET(Eax) );
382 fprintf( outfile, "\tmovl %d(%%ebx), %%edx\n", CONTEXTOFFSET(Edx) );
383 fprintf( outfile, "\tmovl %d(%%ebx), %%ecx\n", CONTEXTOFFSET(Ecx) );
384 fprintf( outfile, "\tmovl %d(%%ebx), %%ebx\n", CONTEXTOFFSET(Ebx) );
385
386 fprintf( outfile, "\tpopl %%ds\n" );
387 fprintf( outfile, "\tpopfl\n" );
388 fprintf( outfile, "\tlret\n" );
389 }
390 else
391 {
392 /* Switch stack back */
393 /* fprintf( outfile, "\t.byte 0x64\n\tlssw (%d), %%sp\n", STACKOFFSET ); */
394 fprintf( outfile, "\t.byte 0x64,0x66,0x0f,0xb2,0x25\n\t.long %d\n", STACKOFFSET );
395 fprintf( outfile, "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
396
397 /* Restore registers */
398 fprintf( outfile, "\tpopl %%edx\n" );
399 fprintf( outfile, "\tpopl %%ecx\n" );
400 fprintf( outfile, "\tpopl %%ebp\n" );
401 fprintf( outfile, "\tpopw %%ds\n" );
402 fprintf( outfile, "\tpopw %%es\n" );
403 fprintf( outfile, "\tpopw %%fs\n" );
404 fprintf( outfile, "\tpopw %%gs\n" );
405
406 /* Prepare return value and set flags accordingly */
407 if ( !short_ret )
408 fprintf( outfile, "\tshldl $16, %%eax, %%edx\n" );
409 fprintf( outfile, "\torl %%eax, %%eax\n" );
410
411 /* Return to return stub which will return to caller */
412 fprintf( outfile, "\tlret $12\n" );
413 }
414 }
415
416
417 /*******************************************************************
418 * BuildCallTo16Core
419 *
420 * This routine builds the core routines used in 32->16 thunks:
421 *
422 * extern void WINAPI wine_call_to_16_word( SEGPTR target, int nb_args );
423 * extern void WINAPI wine_call_to_16_long( SEGPTR target, int nb_args );
424 * extern void WINAPI wine_call_to_16_regs_short( const CONTEXT86 *context, int nb_args );
425 * extern void WINAPI wine_call_to_16_regs_long ( const CONTEXT86 *context, int nb_args );
426 *
427 * These routines can be called directly from 32-bit code.
428 *
429 * All routines expect that the 16-bit stack contents (arguments) were
430 * already set up by the caller; nb_args must contain the number of bytes
431 * to be conserved. The 16-bit SS:SP will be set accordinly.
432 *
433 * All other registers are either taken from the CONTEXT86 structure
434 * or else set to default values. The target routine address is either
435 * given directly or taken from the CONTEXT86.
436 *
437 * If you want to call a 16-bit routine taking only standard argument types
438 * (WORD and LONG), you can also have an appropriate argument conversion
439 * stub automatically generated (see BuildCallTo16); you'd then call this
440 * stub, which in turn would prepare the 16-bit stack and call the appropiate
441 * core routine.
442 *
443 */
444 static void BuildCallTo16Core( FILE *outfile, int short_ret, int reg_func )
445 {
446 char *name = reg_func == 2 ? "regs_long" :
447 reg_func == 1 ? "regs_short" :
448 short_ret? "word" : "long";
449
450 /* Function header */
451 fprintf( outfile, "\n\t.align 4\n" );
452 #ifdef USE_STABS
453 fprintf( outfile, ".stabs \"wine_call_to_16_%s:F1\",36,0,0," PREFIX "wine_call_to_16_%s\n",
454 name, name);
455 #endif
456 fprintf( outfile, "\t" __ASM_FUNC("wine_call_to_16_%s") "\n", name );
457 fprintf( outfile, "\t.globl " PREFIX "wine_call_to_16_%s\n", name );
458 fprintf( outfile, PREFIX "wine_call_to_16_%s:\n", name );
459
460 /* Function entry sequence */
461 fprintf( outfile, "\tpushl %%ebp\n" );
462 fprintf( outfile, "\tmovl %%esp, %%ebp\n" );
463
464 /* Save the 32-bit registers */
465 fprintf( outfile, "\tpushl %%ebx\n" );
466 fprintf( outfile, "\tpushl %%ecx\n" );
467 fprintf( outfile, "\tpushl %%edx\n" );
468 fprintf( outfile, "\tpushl %%esi\n" );
469 fprintf( outfile, "\tpushl %%edi\n" );
470
471 if ( UsePIC )
472 {
473 /* Get Global Offset Table into %ebx */
474 fprintf( outfile, "\tcall .Lwine_call_to_16_%s.getgot1\n", name );
475 fprintf( outfile, ".Lwine_call_to_16_%s.getgot1:\n", name );
476 fprintf( outfile, "\tpopl %%ebx\n" );
477 fprintf( outfile, "\taddl $_GLOBAL_OFFSET_TABLE_+[.-.Lwine_call_to_16_%s.getgot1], %%ebx\n", name );
478 }
479
480 /* Enter Win16 Mutex */
481 if ( UsePIC )
482 fprintf( outfile, "\tcall " PREFIX "_EnterWin16Lock@PLT\n" );
483 else
484 fprintf( outfile, "\tcall " PREFIX "_EnterWin16Lock\n" );
485
486 /* Print debugging info */
487 if (debugging)
488 {
489 /* Push flags, number of arguments, and target */
490 fprintf( outfile, "\tpushl $%d\n", reg_func );
491 fprintf( outfile, "\tpushl 12(%%ebp)\n" );
492 fprintf( outfile, "\tpushl 8(%%ebp)\n" );
493
494 if ( UsePIC )
495 fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallTo16@PLT\n" );
496 else
497 fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallTo16\n" );
498
499 fprintf( outfile, "\taddl $12, %%esp\n" );
500 }
501
502 /* Get return address */
503 if ( UsePIC )
504 {
505 fprintf( outfile, "\tmovl " PREFIX "CallTo16_RetAddr@GOT(%%ebx), %%ecx\n" );
506 fprintf( outfile, "\tmovl " PREFIX "(%%ecx), %%ecx\n" );
507 }
508 else
509 fprintf( outfile, "\tmovl " PREFIX "CallTo16_RetAddr, %%ecx\n" );
510
511 /* Call the actual CallTo16 routine (simulate a lcall) */
512 fprintf( outfile, "\tpushl %%cs\n" );
513 fprintf( outfile, "\tcall .Lwine_call_to_16_%s\n", name );
514
515 if ( !reg_func )
516 {
517 /* Convert and push return value */
518 if ( short_ret )
519 {
520 fprintf( outfile, "\tmovzwl %%ax, %%eax\n" );
521 fprintf( outfile, "\tpushl %%eax\n" );
522 }
523 else
524 {
525 fprintf( outfile, "\tshll $16,%%edx\n" );
526 fprintf( outfile, "\tmovw %%ax,%%dx\n" );
527 fprintf( outfile, "\tpushl %%edx\n" );
528 }
529 }
530 else
531 {
532 /*
533 * Modify CONTEXT86 structure to contain new values
534 *
535 * NOTE: We restore only EAX, EBX, EDX, EDX, EBP, and ESP.
536 * The segment registers as well as ESI and EDI should
537 * not be modified by a well-behaved 16-bit routine in
538 * any case. [If necessary, we could restore them as well,
539 * at the cost of a somewhat less efficient return path.]
540 */
541
542 fprintf( outfile, "\tmovl %d(%%esp), %%edi\n", STACK32OFFSET(target)-12 );
543 fprintf( outfile, "\tmovl %%eax, %d(%%edi)\n", CONTEXTOFFSET(Eax) );
544 fprintf( outfile, "\tmovl %%ebx, %d(%%edi)\n", CONTEXTOFFSET(Ebx) );
545 fprintf( outfile, "\tmovl %%ecx, %d(%%edi)\n", CONTEXTOFFSET(Ecx) );
546 fprintf( outfile, "\tmovl %%edx, %d(%%edi)\n", CONTEXTOFFSET(Edx) );
547 fprintf( outfile, "\tmovl %%ebp, %d(%%edi)\n", CONTEXTOFFSET(Ebp) );
548 fprintf( outfile, "\tmovl %%esi, %d(%%edi)\n", CONTEXTOFFSET(Esp) );
549 /* The return glue code saved %esp into %esi */
550
551 fprintf( outfile, "\tpushl %%edi\n" );
552 }
553
554 if ( UsePIC )
555 {
556 /* Get Global Offset Table into %ebx (might have been overwritten) */
557 fprintf( outfile, "\tcall .Lwine_call_to_16_%s.getgot2\n", name );
558 fprintf( outfile, ".Lwine_call_to_16_%s.getgot2:\n", name );
559 fprintf( outfile, "\tpopl %%ebx\n" );
560 fprintf( outfile, "\taddl $_GLOBAL_OFFSET_TABLE_+[.-.Lwine_call_to_16_%s.getgot2], %%ebx\n", name );
561 }
562
563 /* Print debugging info */
564 if (debugging)
565 {
566 fprintf( outfile, "\tpushl $%d\n", reg_func );
567
568 if ( UsePIC )
569 fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallTo16Ret@PLT\n" );
570 else
571 fprintf( outfile, "\tcall " PREFIX "RELAY_DebugCallTo16Ret\n" );
572
573 fprintf( outfile, "\taddl $4, %%esp\n" );
574 }
575
576 /* Leave Win16 Mutex */
577 if ( UsePIC )
578 fprintf( outfile, "\tcall " PREFIX "_LeaveWin16Lock@PLT\n" );
579 else
580 fprintf( outfile, "\tcall " PREFIX "_LeaveWin16Lock\n" );
581
582 /* Get return value */
583 fprintf( outfile, "\tpopl %%eax\n" );
584
585 /* Restore the 32-bit registers */
586 fprintf( outfile, "\tpopl %%edi\n" );
587 fprintf( outfile, "\tpopl %%esi\n" );
588 fprintf( outfile, "\tpopl %%edx\n" );
589 fprintf( outfile, "\tpopl %%ecx\n" );
590 fprintf( outfile, "\tpopl %%ebx\n" );
591
592 /* Function exit sequence */
593 fprintf( outfile, "\tpopl %%ebp\n" );
594 fprintf( outfile, "\tret $8\n" );
595
596
597 /* Start of the actual CallTo16 routine */
598
599 fprintf( outfile, ".Lwine_call_to_16_%s:\n", name );
600
601 /* Complete STACK32FRAME */
602 fprintf( outfile, "\t.byte 0x64\n\tpushl (%d)\n", STACKOFFSET );
603 fprintf( outfile, "\tmovl %%esp,%%edx\n" );
604
605 /* Switch to the 16-bit stack */
606 #ifdef __svr4__
607 fprintf( outfile,"\tdata16\n");
608 #endif
609 fprintf( outfile, "\t.byte 0x64\n\tmovw (%d),%%ss\n", STACKOFFSET + 2);
610 fprintf( outfile, "\t.byte 0x64\n\tmovw (%d),%%sp\n", STACKOFFSET );
611 fprintf( outfile, "\t.byte 0x64\n\tmovl %%edx,(%d)\n", STACKOFFSET );
612
613 /* Make %bp point to the previous stackframe (built by CallFrom16) */
614 fprintf( outfile, "\tmovzwl %%sp,%%ebp\n" );
615 fprintf( outfile, "\tleal %d(%%ebp),%%ebp\n", STACK16OFFSET(bp) );
616
617 /* Add the specified offset to the new sp */
618 fprintf( outfile, "\tsubw %d(%%edx), %%sp\n", STACK32OFFSET(nb_args) );
619
620 /* Push the return address
621 * With sreg suffix, we push 16:16 address (normal lret)
622 * With lreg suffix, we push 16:32 address (0x66 lret, for KERNEL32_45)
623 */
624 if (reg_func != 2)
625 fprintf( outfile, "\tpushl %%ecx\n" );
626 else
627 {
628 fprintf( outfile, "\tshldl $16, %%ecx, %%eax\n" );
629 fprintf( outfile, "\tpushw $0\n" );
630 fprintf( outfile, "\tpushw %%ax\n" );
631 fprintf( outfile, "\tpushw $0\n" );
632 fprintf( outfile, "\tpushw %%cx\n" );
633 }
634
635 if (reg_func)
636 {
637 /* Push the called routine address */
638 fprintf( outfile, "\tmovl %d(%%edx),%%edx\n", STACK32OFFSET(target) );
639 fprintf( outfile, "\tpushw %d(%%edx)\n", CONTEXTOFFSET(SegCs) );
640 fprintf( outfile, "\tpushw %d(%%edx)\n", CONTEXTOFFSET(Eip) );
641
642 /* Get the registers */
643 fprintf( outfile, "\tpushw %d(%%edx)\n", CONTEXTOFFSET(SegDs) );
644 fprintf( outfile, "\tmovl %d(%%edx),%%eax\n", CONTEXTOFFSET(SegEs) );
645 fprintf( outfile, "\tmovw %%ax,%%es\n" );
646 fprintf( outfile, "\tmovl %d(%%edx),%%eax\n", CONTEXTOFFSET(SegFs) );
647 fprintf( outfile, "\tmovw %%ax,%%fs\n" );
648 fprintf( outfile, "\tmovl %d(%%edx),%%ebp\n", CONTEXTOFFSET(Ebp) );
649 fprintf( outfile, "\tmovl %d(%%edx),%%esi\n", CONTEXTOFFSET(Esi) );
650 fprintf( outfile, "\tmovl %d(%%edx),%%edi\n", CONTEXTOFFSET(Edi) );
651 fprintf( outfile, "\tmovl %d(%%edx),%%eax\n", CONTEXTOFFSET(Eax) );
652 fprintf( outfile, "\tmovl %d(%%edx),%%ebx\n", CONTEXTOFFSET(Ebx) );
653 fprintf( outfile, "\tmovl %d(%%edx),%%ecx\n", CONTEXTOFFSET(Ecx) );
654 fprintf( outfile, "\tmovl %d(%%edx),%%edx\n", CONTEXTOFFSET(Edx) );
655
656 /* Get the 16-bit ds */
657 fprintf( outfile, "\tpopw %%ds\n" );
658 }
659 else /* not a register function */
660 {
661 /* Push the called routine address */
662 fprintf( outfile, "\tpushl %d(%%edx)\n", STACK32OFFSET(target) );
663
664 /* Set %fs to the value saved by the last CallFrom16 */
665 fprintf( outfile, "\tmovw %d(%%ebp),%%ax\n", STACK16OFFSET(fs)-STACK16OFFSET(bp) );
666 fprintf( outfile, "\tmovw %%ax,%%fs\n" );
667
668 /* Set %ds and %es (and %ax just in case) equal to %ss */
669 fprintf( outfile, "\tmovw %%ss,%%ax\n" );
670 fprintf( outfile, "\tmovw %%ax,%%ds\n" );
671 fprintf( outfile, "\tmovw %%ax,%%es\n" );
672 }
673
674 /* Jump to the called routine */
675 fprintf( outfile, "\t.byte 0x66\n" );
676 fprintf( outfile, "\tlret\n" );
677 }
678
679
680 /*******************************************************************
681 * BuildRet16Func
682 *
683 * Build the return code for 16-bit callbacks
684 */
685 static void BuildRet16Func( FILE *outfile )
686 {
687 /*
688 * Note: This must reside in the .data section to allow
689 * run-time relocation of the SYSLEVEL_Win16CurrentTeb symbol
690 */
691
692 fprintf( outfile, "\n\t" __ASM_FUNC("CallTo16_Ret") "\n" );
693 fprintf( outfile, "\t.globl " PREFIX "CallTo16_Ret\n" );
694 fprintf( outfile, PREFIX "CallTo16_Ret:\n" );
695
696 /* Save %esp into %esi */
697 fprintf( outfile, "\tmovl %%esp,%%esi\n" );
698
699 /* Restore 32-bit segment registers */
700
701 fprintf( outfile, "\t.byte 0x2e\n\tmovl " PREFIX "CallTo16_DataSelector-" PREFIX "Call16_Ret_Start,%%edi\n" );
702 #ifdef __svr4__
703 fprintf( outfile, "\tdata16\n");
704 #endif
705 fprintf( outfile, "\tmovw %%di,%%ds\n" );
706 #ifdef __svr4__
707 fprintf( outfile, "\tdata16\n");
708 #endif
709 fprintf( outfile, "\tmovw %%di,%%es\n" );
710
711 fprintf( outfile, "\tmovw " PREFIX "SYSLEVEL_Win16CurrentTeb,%%fs\n" );
712
713 /* Restore the 32-bit stack */
714
715 #ifdef __svr4__
716 fprintf( outfile, "\tdata16\n");
717 #endif
718 fprintf( outfile, "\tmovw %%di,%%ss\n" );
719 fprintf( outfile, "\t.byte 0x64\n\tmovl (%d),%%esp\n", STACKOFFSET );
720 fprintf( outfile, "\t.byte 0x64\n\tpopl (%d)\n", STACKOFFSET );
721
722 /* Return to caller */
723
724 fprintf( outfile, "\tlret\n" );
725
726 /* Declare the return address and data selector variables */
727
728 fprintf( outfile, "\n\t.align 4\n" );
729 fprintf( outfile, "\t.globl " PREFIX "CallTo16_DataSelector\n" );
730 fprintf( outfile, PREFIX "CallTo16_DataSelector:\t.long 0\n" );
731 fprintf( outfile, "\t.globl " PREFIX "CallTo16_RetAddr\n" );
732 fprintf( outfile, PREFIX "CallTo16_RetAddr:\t.long 0\n" );
733 }
734
735
736 /*******************************************************************
737 * BuildCallTo32CBClient
738 *
739 * Call a CBClient relay stub from 32-bit code (KERNEL.620).
740 *
741 * Since the relay stub is itself 32-bit, this should not be a problem;
742 * unfortunately, the relay stubs are expected to switch back to a
743 * 16-bit stack (and 16-bit code) after completion :-(
744 *
745 * This would conflict with our 16- vs. 32-bit stack handling, so
746 * we simply switch *back* to our 32-bit stack before returning to
747 * the caller ...
748 *
749 * The CBClient relay stub expects to be called with the following
750 * 16-bit stack layout, and with ebp and ebx pointing into the 16-bit
751 * stack at the designated places:
752 *
753 * ...
754 * (ebp+14) original arguments to the callback routine
755 * (ebp+10) far return address to original caller
756 * (ebp+6) Thunklet target address
757 * (ebp+2) Thunklet relay ID code
758 * (ebp) BP (saved by CBClientGlueSL)
759 * (ebp-2) SI (saved by CBClientGlueSL)
760 * (ebp-4) DI (saved by CBClientGlueSL)
761 * (ebp-6) DS (saved by CBClientGlueSL)
762 *
763 * ... buffer space used by the 16-bit side glue for temp copies
764 *
765 * (ebx+4) far return address to 16-bit side glue code
766 * (ebx) saved 16-bit ss:sp (pointing to ebx+4)
767 *
768 * The 32-bit side glue code accesses both the original arguments (via ebp)
769 * and the temporary copies prepared by the 16-bit side glue (via ebx).
770 * After completion, the stub will load ss:sp from the buffer at ebx
771 * and perform a far return to 16-bit code.
772 *
773 * To trick the relay stub into returning to us, we replace the 16-bit
774 * return address to the glue code by a cs:ip pair pointing to our
775 * return entry point (the original return address is saved first).
776 * Our return stub thus called will then reload the 32-bit ss:esp and
777 * return to 32-bit code (by using and ss:esp value that we have also
778 * pushed onto the 16-bit stack before and a cs:eip values found at
779 * that position on the 32-bit stack). The ss:esp to be restored is
780 * found relative to the 16-bit stack pointer at:
781 *
782 * (ebx-4) ss (flat)
783 * (ebx-8) sp (32-bit stack pointer)
784 *
785 * The second variant of this routine, CALL32_CBClientEx, which is used
786 * to implement KERNEL.621, has to cope with yet another problem: Here,
787 * the 32-bit side directly returns to the caller of the CBClient thunklet,
788 * restoring registers saved by CBClientGlueSL and cleaning up the stack.
789 * As we have to return to our 32-bit code first, we have to adapt the
790 * layout of our temporary area so as to include values for the registers
791 * that are to be restored, and later (in the implementation of KERNEL.621)
792 * we *really* restore them. The return stub restores DS, DI, SI, and BP
793 * from the stack, skips the next 8 bytes (CBClient relay code / target),
794 * and then performs a lret NN, where NN is the number of arguments to be
795 * removed. Thus, we prepare our temporary area as follows:
796 *
797 * (ebx+22) 16-bit cs (this segment)
798 * (ebx+20) 16-bit ip ('16-bit' return entry point)
799 * (ebx+16) 32-bit ss (flat)
800 * (ebx+12) 32-bit sp (32-bit stack pointer)
801 * (ebx+10) 16-bit bp (points to ebx+24)
802 * (ebx+8) 16-bit si (ignored)
803 * (ebx+6) 16-bit di (ignored)
804 * (ebx+4) 16-bit ds (we actually use the flat DS here)
805 * (ebx+2) 16-bit ss (16-bit stack segment)
806 * (ebx+0) 16-bit sp (points to ebx+4)
807 *
808 * Note that we ensure that DS is not changed and remains the flat segment,
809 * and the 32-bit stack pointer our own return stub needs fits just
810 * perfectly into the 8 bytes that are skipped by the Windows stub.
811 * One problem is that we have to determine the number of removed arguments,
812 * as these have to be really removed in KERNEL.621. Thus, the BP value
813 * that we place in the temporary area to be restored, contains the value
814 * that SP would have if no arguments were removed. By comparing the actual
815 * value of SP with this value in our return stub we can compute the number
816 * of removed arguments. This is then returned to KERNEL.621.
817 *
818 * The stack layout of this function:
819 * (ebp+20) nArgs pointer to variable receiving nr. of args (Ex only)
820 * (ebp+16) esi pointer to caller's esi value
821 * (ebp+12) arg ebp value to be set for relay stub
822 * (ebp+8) func CBClient relay stub address
823 * (ebp+4) ret addr
824 * (ebp) ebp
825 */
826 static void BuildCallTo32CBClient( FILE *outfile, BOOL isEx )
827 {
828 char *name = isEx? "CBClientEx" : "CBClient";
829 int size = isEx? 24 : 12;
830
831 /* Function header */
832
833 fprintf( outfile, "\n\t.align 4\n" );
834 #ifdef USE_STABS
835 fprintf( outfile, ".stabs \"CALL32_%s:F1\",36,0,0," PREFIX "CALL32_%s\n",
836 name, name );
837 #endif
838 fprintf( outfile, "\t.globl " PREFIX "CALL32_%s\n", name );
839 fprintf( outfile, PREFIX "CALL32_%s:\n", name );
840
841 /* Entry code */
842
843 fprintf( outfile, "\tpushl %%ebp\n" );
844 fprintf( outfile, "\tmovl %%esp,%%ebp\n" );
845 fprintf( outfile, "\tpushl %%edi\n" );
846 fprintf( outfile, "\tpushl %%esi\n" );
847 fprintf( outfile, "\tpushl %%ebx\n" );
848
849 /* Get the 16-bit stack */
850
851 fprintf( outfile, "\t.byte 0x64\n\tmovl (%d),%%ebx\n", STACKOFFSET);
852
853 /* Convert it to a flat address */
854
855 fprintf( outfile, "\tshldl $16,%%ebx,%%eax\n" );
856 fprintf( outfile, "\tandl $0xfff8,%%eax\n" );
857 fprintf( outfile, "\tshrl $1,%%eax\n" );
858 fprintf( outfile, "\tmovl " PREFIX "wine_ldt_copy(%%eax),%%esi\n" );
859 fprintf( outfile, "\tmovw %%bx,%%ax\n" );
860 fprintf( outfile, "\taddl %%eax,%%esi\n" );
861
862 /* Allocate temporary area (simulate STACK16_PUSH) */
863
864 fprintf( outfile, "\tpushf\n" );
865 fprintf( outfile, "\tcld\n" );
866 fprintf( outfile, "\tleal -%d(%%esi), %%edi\n", size );
867 fprintf( outfile, "\tmovl $%d, %%ecx\n", sizeof(STACK16FRAME) );
868 fprintf( outfile, "\trep\n\tmovsb\n" );
869 fprintf( outfile, "\tpopf\n" );
870
871 fprintf( outfile, "\t.byte 0x64\n\tsubw $%d,(%d)\n", size, STACKOFFSET );
872
873 fprintf( outfile, "\tpushl %%edi\n" ); /* remember address */
874
875 /* Set up temporary area */
876
877 if ( !isEx )
878 {
879 fprintf( outfile, "\tleal 4(%%edi), %%edi\n" );
880
881 fprintf( outfile, "\tleal -8(%%esp), %%eax\n" );
882 fprintf( outfile, "\tmovl %%eax, -8(%%edi)\n" ); /* 32-bit sp */
883
884 fprintf( outfile, "\tmovw %%ss, %%ax\n" );
885 fprintf( outfile, "\tandl $0x0000ffff, %%eax\n" );
886 fprintf( outfile, "\tmovl %%eax, -4(%%edi)\n" ); /* 32-bit ss */
887
888 fprintf( outfile, "\taddl $%d, %%ebx\n", sizeof(STACK16FRAME)-size+4 + 4 );
889 fprintf( outfile, "\tmovl %%ebx, 0(%%edi)\n" ); /* 16-bit ss:sp */
890
891 fprintf( outfile, "\tmovl " PREFIX "CALL32_%s_RetAddr, %%eax\n", name );
892 fprintf( outfile, "\tmovl %%eax, 4(%%edi)\n" ); /* overwrite return address */
893 }
894 else
895 {
896 fprintf( outfile, "\taddl $%d, %%ebx\n", sizeof(STACK16FRAME)-size+4 );
897 fprintf( outfile, "\tmovl %%ebx, 0(%%edi)\n" );
898
899 fprintf( outfile, "\tmovw %%ds, %%ax\n" );
900 fprintf( outfile, "\tmovw %%ax, 4(%%edi)\n" );
901
902 fprintf( outfile, "\taddl $20, %%ebx\n" );
903 fprintf( outfile, "\tmovw %%bx, 10(%%edi)\n" );
904
905 fprintf( outfile, "\tleal -8(%%esp), %%eax\n" );
906 fprintf( outfile, "\tmovl %%eax, 12(%%edi)\n" );
907
908 fprintf( outfile, "\tmovw %%ss, %%ax\n" );
909 fprintf( outfile, "\tandl $0x0000ffff, %%eax\n" );
910 fprintf( outfile, "\tmovl %%eax, 16(%%edi)\n" );
911
912 fprintf( outfile, "\tmovl " PREFIX "CALL32_%s_RetAddr, %%eax\n", name );
913 fprintf( outfile, "\tmovl %%eax, 20(%%edi)\n" );
914 }
915
916 /* Set up registers and call CBClient relay stub (simulating a far call) */
917
918 fprintf( outfile, "\tmovl 16(%%ebp), %%esi\n" );
919 fprintf( outfile, "\tmovl (%%esi), %%esi\n" );
920
921 fprintf( outfile, "\tmovl %%edi, %%ebx\n" );
922 fprintf( outfile, "\tmovl 8(%%ebp), %%eax\n" );
923 fprintf( outfile, "\tmovl 12(%%ebp), %%ebp\n" );
924
925 fprintf( outfile, "\tpushl %%cs\n" );
926 fprintf( outfile, "\tcall *%%eax\n" );
927
928 /* Return new esi value to caller */
929
930 fprintf( outfile, "\tmovl 32(%%esp), %%edi\n" );
931 fprintf( outfile, "\tmovl %%esi, (%%edi)\n" );
932
933 /* Cleanup temporary area (simulate STACK16_POP) */
934
935 fprintf( outfile, "\tpop %%esi\n" );
936
937 fprintf( outfile, "\tpushf\n" );
938 fprintf( outfile, "\tstd\n" );
939 fprintf( outfile, "\tdec %%esi\n" );
940 fprintf( outfile, "\tleal %d(%%esi), %%edi\n", size );
941 fprintf( outfile, "\tmovl $%d, %%ecx\n", sizeof(STACK16FRAME) );
942 fprintf( outfile, "\trep\n\tmovsb\n" );
943 fprintf( outfile, "\tpopf\n" );
944
945 fprintf( outfile, "\t.byte 0x64\n\taddw $%d,(%d)\n", size, STACKOFFSET );
946
947 /* Return argument size to caller */
948 if ( isEx )
949 {
950 fprintf( outfile, "\tmovl 32(%%esp), %%ebx\n" );
951 fprintf( outfile, "\tmovl %%ebp, (%%ebx)\n" );
952 }
953
954 /* Restore registers and return */
955
956 fprintf( outfile, "\tpopl %%ebx\n" );
957 fprintf( outfile, "\tpopl %%esi\n" );
958 fprintf( outfile, "\tpopl %%edi\n" );
959 fprintf( outfile, "\tpopl %%ebp\n" );
960 fprintf( outfile, "\tret\n" );
961 }
962
963 static void BuildCallTo32CBClientRet( FILE *outfile, BOOL isEx )
964 {
965 char *name = isEx? "CBClientEx" : "CBClient";
966
967 /* '16-bit' return stub */
968
969 fprintf( outfile, "\n\t.globl " PREFIX "CALL32_%s_Ret\n", name );
970 fprintf( outfile, PREFIX "CALL32_%s_Ret:\n", name );
971
972 if ( !isEx )
973 {
974 fprintf( outfile, "\tmovzwl %%sp, %%ebx\n" );
975 fprintf( outfile, "\tlssl %%ss:-16(%%ebx), %%esp\n" );
976 }
977 else
978 {
979 fprintf( outfile, "\tmovzwl %%bp, %%ebx\n" );
980 fprintf( outfile, "\tsubw %%bp, %%sp\n" );
981 fprintf( outfile, "\tmovzwl %%sp, %%ebp\n" );
982 fprintf( outfile, "\tlssl %%ss:-12(%%ebx), %%esp\n" );
983 }
984 fprintf( outfile, "\tlret\n" );
985
986 /* Declare the return address variable */
987
988 fprintf( outfile, "\n\t.globl " PREFIX "CALL32_%s_RetAddr\n", name );
989 fprintf( outfile, PREFIX "CALL32_%s_RetAddr:\t.long 0\n", name );
990 }
991
992
993 /*******************************************************************
994 * BuildCallFrom32Regs
995 *
996 * Build a 32-bit-to-Wine call-back function for a 'register' function.
997 * 'args' is the number of dword arguments.
998 *
999 * Stack layout:
1000 * ...
1001 * (ebp+12) first arg
1002 * (ebp+8) ret addr to user code
1003 * (ebp+4) ret addr to relay code
1004 * (ebp+0) saved ebp
1005 * (ebp-128) buffer area to allow stack frame manipulation
1006 * (ebp-332) CONTEXT86 struct
1007 * (ebp-336) CONTEXT86 *argument
1008 * .... other arguments copied from (ebp+12)
1009 *
1010 * The entry point routine is called with a CONTEXT* extra argument,
1011 * following the normal args. In this context structure, EIP_reg
1012 * contains the return address to user code, and ESP_reg the stack
1013 * pointer on return (with the return address and arguments already
1014 * removed).
1015 */
1016 static void BuildCallFrom32Regs( FILE *outfile )
1017 {
1018 static const int STACK_SPACE = 128 + sizeof(CONTEXT86);
1019
1020 /* Function header */
1021
1022 fprintf( outfile, "\n\t.align 4\n" );
1023 #ifdef USE_STABS
1024 fprintf( outfile, ".stabs \"CALL32_Regs:F1\",36,0,0," PREFIX "CALL32_Regs\n" );
1025 #endif
1026 fprintf( outfile, "\t.globl " PREFIX "CALL32_Regs\n" );
1027 fprintf( outfile, PREFIX "CALL32_Regs:\n" );
1028
1029 /* Allocate some buffer space on the stack */
1030
1031 fprintf( outfile, "\tpushl %%ebp\n" );
1032 fprintf( outfile, "\tmovl %%esp,%%ebp\n ");
1033 fprintf( outfile, "\tleal -%d(%%esp), %%esp\n", STACK_SPACE );
1034
1035 /* Build the context structure */
1036
1037 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Eax) - STACK_SPACE );
1038 fprintf( outfile, "\tpushfl\n" );
1039 fprintf( outfile, "\tpopl %%eax\n" );
1040 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(EFlags) - STACK_SPACE );
1041 fprintf( outfile, "\tmovl 0(%%ebp),%%eax\n" );
1042 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Ebp) - STACK_SPACE );
1043 fprintf( outfile, "\tmovl %%ebx,%d(%%ebp)\n", CONTEXTOFFSET(Ebx) - STACK_SPACE );
1044 fprintf( outfile, "\tmovl %%ecx,%d(%%ebp)\n", CONTEXTOFFSET(Ecx) - STACK_SPACE );
1045 fprintf( outfile, "\tmovl %%edx,%d(%%ebp)\n", CONTEXTOFFSET(Edx) - STACK_SPACE );
1046 fprintf( outfile, "\tmovl %%esi,%d(%%ebp)\n", CONTEXTOFFSET(Esi) - STACK_SPACE );
1047 fprintf( outfile, "\tmovl %%edi,%d(%%ebp)\n", CONTEXTOFFSET(Edi) - STACK_SPACE );
1048
1049 fprintf( outfile, "\txorl %%eax,%%eax\n" );
1050 fprintf( outfile, "\tmovw %%cs,%%ax\n" );
1051 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegCs) - STACK_SPACE );
1052 fprintf( outfile, "\tmovw %%es,%%ax\n" );
1053 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegEs) - STACK_SPACE );
1054 fprintf( outfile, "\tmovw %%fs,%%ax\n" );
1055 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegFs) - STACK_SPACE );
1056 fprintf( outfile, "\tmovw %%gs,%%ax\n" );
1057 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegGs) - STACK_SPACE );
1058 fprintf( outfile, "\tmovw %%ss,%%ax\n" );
1059 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegSs) - STACK_SPACE );
1060 fprintf( outfile, "\tmovw %%ds,%%ax\n" );
1061 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(SegDs) - STACK_SPACE );
1062 fprintf( outfile, "\tmovw %%ax,%%es\n" ); /* set %es equal to %ds just in case */
1063
1064 fprintf( outfile, "\tmovl $0x%x,%%eax\n", CONTEXT86_FULL );
1065 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(ContextFlags) - STACK_SPACE );
1066
1067 fprintf( outfile, "\tmovl 8(%%ebp),%%eax\n" ); /* Get %eip at time of call */
1068 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Eip) - STACK_SPACE );
1069
1070 /* Transfer the arguments */
1071
1072 fprintf( outfile, "\tmovl 4(%%ebp),%%ebx\n" ); /* get relay code addr */
1073 fprintf( outfile, "\tpushl %%esp\n" ); /* push ptr to context struct */
1074 fprintf( outfile, "\tmovzbl 4(%%ebx),%%ecx\n" ); /* fetch number of args to copy */
1075 fprintf( outfile, "\tjecxz 1f\n" );
1076 fprintf( outfile, "\tsubl %%ecx,%%esp\n" );
1077 fprintf( outfile, "\tleal 12(%%ebp),%%esi\n" ); /* get %esp at time of call */
1078 fprintf( outfile, "\tmovl %%esp,%%edi\n" );
1079 fprintf( outfile, "\tshrl $2,%%ecx\n" );
1080 fprintf( outfile, "\tcld\n" );
1081 fprintf( outfile, "\trep\n\tmovsl\n" ); /* copy args */
1082
1083 fprintf( outfile, "1:\tmovzbl 5(%%ebx),%%eax\n" ); /* fetch number of args to remove */
1084 fprintf( outfile, "\tleal 12(%%ebp,%%eax),%%eax\n" );
1085 fprintf( outfile, "\tmovl %%eax,%d(%%ebp)\n", CONTEXTOFFSET(Esp) - STACK_SPACE );
1086
1087 /* Call the entry point */
1088
1089 fprintf( outfile, "\tcall *0(%%ebx)\n" );
1090
1091 /* Store %eip and %ebp onto the new stack */
1092
1093 fprintf( outfile, "\tmovl %d(%%ebp),%%edx\n", CONTEXTOFFSET(Esp) - STACK_SPACE );
1094 fprintf( outfile, "\tmovl %d(%%ebp),%%eax\n", CONTEXTOFFSET(Eip) - STACK_SPACE );
1095 fprintf( outfile, "\tmovl %%eax,-4(%%edx)\n" );
1096 fprintf( outfile, "\tmovl %d(%%ebp),%%eax\n", CONTEXTOFFSET(Ebp) - STACK_SPACE );
1097 fprintf( outfile, "\tmovl %%eax,-8(%%edx)\n" );
1098
1099 /* Restore the context structure */
1100
1101 /* Note: we don't bother to restore %cs, %ds and %ss
1102 * changing them in 32-bit code is a recipe for disaster anyway
1103 */
1104 fprintf( outfile, "\tmovl %d(%%ebp),%%eax\n", CONTEXTOFFSET(SegEs) - STACK_SPACE );
1105 fprintf( outfile, "\tmovw %%ax,%%es\n" );
1106 fprintf( outfile, "\tmovl %d(%%ebp),%%eax\n", CONTEXTOFFSET(SegFs) - STACK_SPACE );
1107 fprintf( outfile, "\tmovw %%ax,%%fs\n" );
1108 fprintf( outfile, "\tmovl %d(%%ebp),%%eax\n", CONTEXTOFFSET(SegGs) - STACK_SPACE );
1109 fprintf( outfile, "\tmovw %%ax,%%gs\n" );
1110
1111 fprintf( outfile, "\tmovl %d(%%ebp),%%edi\n", CONTEXTOFFSET(Edi) - STACK_SPACE );
1112 fprintf( outfile, "\tmovl %d(%%ebp),%%esi\n", CONTEXTOFFSET(Esi) - STACK_SPACE );
1113 fprintf( outfile, "\tmovl %d(%%ebp),%%edx\n", CONTEXTOFFSET(Edx) - STACK_SPACE );
1114 fprintf( outfile, "\tmovl %d(%%ebp),%%ecx\n", CONTEXTOFFSET(Ecx) - STACK_SPACE );
1115 fprintf( outfile, "\tmovl %d(%%ebp),%%ebx\n", CONTEXTOFFSET(Ebx) - STACK_SPACE );
1116
1117 fprintf( outfile, "\tmovl %d(%%ebp),%%eax\n", CONTEXTOFFSET(EFlags) - STACK_SPACE );
1118 fprintf( outfile, "\tpushl %%eax\n" );
1119 fprintf( outfile, "\tpopfl\n" );
1120 fprintf( outfile, "\tmovl %d(%%ebp),%%eax\n", CONTEXTOFFSET(Eax) - STACK_SPACE );
1121
1122 fprintf( outfile, "\tmovl %d(%%ebp),%%ebp\n", CONTEXTOFFSET(Esp) - STACK_SPACE );
1123 fprintf( outfile, "\tleal -8(%%ebp),%%esp\n" );
1124 fprintf( outfile, "\tpopl %%ebp\n" );
1125 fprintf( outfile, "\tret\n" );
1126 }
1127
1128
1129 /*******************************************************************
1130 * BuildRelays
1131 *
1132 * Build all the relay callbacks
1133 */
1134 void BuildRelays( FILE *outfile )
1135 {
1136 /* File header */
1137
1138 fprintf( outfile, "/* File generated automatically. Do not edit! */\n\n" );
1139 fprintf( outfile, "\t.text\n" );
1140
1141 #ifdef USE_STABS
1142 if (output_file_name)
1143 {
1144 char buffer[1024];
1145 getcwd(buffer, sizeof(buffer));
1146 fprintf( outfile, "\t.file\t\"%s\"\n", output_file_name );
1147
1148 /*
1149 * The stabs help the internal debugger as they are an indication that it
1150 * is sensible to step into a thunk/trampoline.
1151 */
1152 fprintf( outfile, ".stabs \"%s/\",100,0,0,Code_Start\n", buffer);
1153 fprintf( outfile, ".stabs \"%s\",100,0,0,Code_Start\n", output_file_name );
1154 fprintf( outfile, "Code_Start:\n\n" );
1155 }
1156 #endif
1157 fprintf( outfile, PREFIX"Call16_Start:\n" );
1158 fprintf( outfile, "\t.globl "PREFIX"Call16_Start\n" );
1159 fprintf( outfile, "\t.byte 0\n\n" );
1160
1161 /* Standard CallFrom16 routine (WORD return) */
1162 BuildCallFrom16Core( outfile, FALSE, FALSE, TRUE );
1163
1164 /* Standard CallFrom16 routine (DWORD return) */
1165 BuildCallFrom16Core( outfile, FALSE, FALSE, FALSE );
1166
1167 /* Register CallFrom16 routine */
1168 BuildCallFrom16Core( outfile, TRUE, FALSE, FALSE );
1169
1170 /* C16ThkSL CallFrom16 routine */
1171 BuildCallFrom16Core( outfile, FALSE, TRUE, FALSE );
1172
1173 /* Standard CallTo16 routine (WORD return) */
1174 BuildCallTo16Core( outfile, TRUE, FALSE );
1175
1176 /* Standard CallTo16 routine (DWORD return) */
1177 BuildCallTo16Core( outfile, FALSE, FALSE );
1178
1179 /* Register CallTo16 routine (16:16 retf) */
1180 BuildCallTo16Core( outfile, FALSE, 1 );
1181
1182 /* Register CallTo16 routine (16:32 retf) */
1183 BuildCallTo16Core( outfile, FALSE, 2 );
1184
1185 /* CBClientThunkSL routine */
1186 BuildCallTo32CBClient( outfile, FALSE );
1187
1188 /* CBClientThunkSLEx routine */
1189 BuildCallTo32CBClient( outfile, TRUE );
1190
1191 /* 32-bit register entry point */
1192 BuildCallFrom32Regs( outfile );
1193
1194 fprintf( outfile, PREFIX"Call16_End:\n" );
1195 fprintf( outfile, "\t.globl "PREFIX"Call16_End\n" );
1196
1197 #ifdef USE_STABS
1198 fprintf( outfile, "\t.stabs \"\",100,0,0,.Letext\n");
1199 fprintf( outfile, ".Letext:\n");
1200 #endif
1201
1202 /* The whole Call16_Ret segment must lie within the .data section */
1203 fprintf( outfile, "\n\t.data\n" );
1204 fprintf( outfile, "\t.globl " PREFIX "Call16_Ret_Start\n" );
1205 fprintf( outfile, PREFIX "Call16_Ret_Start:\n" );
1206
1207 /* Standard CallTo16 return stub */
1208 BuildRet16Func( outfile );
1209
1210 /* CBClientThunkSL return stub */
1211 BuildCallTo32CBClientRet( outfile, FALSE );
1212
1213 /* CBClientThunkSLEx return stub */
1214 BuildCallTo32CBClientRet( outfile, TRUE );
1215
1216 /* End of Call16_Ret segment */
1217 fprintf( outfile, "\n\t.globl " PREFIX "Call16_Ret_End\n" );
1218 fprintf( outfile, PREFIX "Call16_Ret_End:\n" );
1219 }
1220
1221 #else /* __i386__ */
1222
1223 void BuildRelays( FILE *outfile )
1224 {
1225 fprintf( outfile, "/* File not used with this architecture. Do not edit! */\n\n" );
1226 }
1227
1228 #endif /* __i386__ */
1229
Windows API implementation