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ole32: Don't pass incorrect iface pointer to StdMarshalImpl functions.
[wine.git] / dlls / krnl386.exe16 / relay.c
blob264ba2c589b9b976f32c08a22a1ad1d8fa27f70a
1 /*
2 * Copyright 1993 Robert J. Amstadt
3 * Copyright 1995 Alexandre Julliard
4 * Copyright 2002 Jukka Heinonen
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
19 */
20
21 #include "config.h"
22 #include "wine/port.h"
23
24 #include <assert.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <stdarg.h>
28 #include <stdio.h>
29
30 #include "windef.h"
31 #include "winbase.h"
32 #include "wine/winbase16.h"
33 #include "winternl.h"
34 #include "kernel16_private.h"
35 #include "dosexe.h"
36 #include "wine/unicode.h"
37 #include "wine/library.h"
38 #include "wine/debug.h"
39
40 WINE_DEFAULT_DEBUG_CHANNEL(relay);
41
42 /*
43 * Magic DWORD used to check stack integrity.
44 */
45 #define RELAY_MAGIC 0xabcdef00
46
47 /*
48 * Memory block for temporary 16-bit stacks used with relay calls.
49 */
50 typedef struct {
51 DWORD inuse; /* non-zero if stack block is in use */
52 DWORD eip; /* saved ip */
53 DWORD seg_cs; /* saved cs */
54 DWORD esp; /* saved sp */
55 DWORD seg_ss; /* saved ss */
56 DWORD stack_bottom; /* guard dword */
57 BYTE stack[256-7*4]; /* 16-bit stack */
58 DWORD stack_top; /* guard dword */
59 } RELAY_Stack16;
60
61
62 static const WCHAR **debug_relay_excludelist;
63 static const WCHAR **debug_relay_includelist;
64 static const WCHAR **debug_snoop_excludelist;
65 static const WCHAR **debug_snoop_includelist;
66
67 /* compare an ASCII and a Unicode string without depending on the current codepage */
68 static inline int strcmpiAW( const char *strA, const WCHAR *strW )
69 {
70 while (*strA && (toupperW((unsigned char)*strA) == toupperW(*strW))) { strA++; strW++; }
71 return toupperW((unsigned char)*strA) - toupperW(*strW);
72 }
73
74 /* compare an ASCII and a Unicode string without depending on the current codepage */
75 static inline int strncmpiAW( const char *strA, const WCHAR *strW, int n )
76 {
77 int ret = 0;
78 for ( ; n > 0; n--, strA++, strW++)
79 if ((ret = toupperW((unsigned char)*strA) - toupperW(*strW)) || !*strA) break;
80 return ret;
81 }
82
83 /***********************************************************************
84 * build_list
85 *
86 * Build a function list from a ';'-separated string.
87 */
88 static const WCHAR **build_list( const WCHAR *buffer )
89 {
90 int count = 1;
91 const WCHAR *p = buffer;
92 const WCHAR **ret;
93
94 while ((p = strchrW( p, ';' )))
95 {
96 count++;
97 p++;
98 }
99 /* allocate count+1 pointers, plus the space for a copy of the string */
100 if ((ret = RtlAllocateHeap( GetProcessHeap(), 0,
101 (count+1) * sizeof(WCHAR*) + (strlenW(buffer)+1) * sizeof(WCHAR) )))
102 {
103 WCHAR *str = (WCHAR *)(ret + count + 1);
104 WCHAR *p = str;
105
106 strcpyW( str, buffer );
107 count = 0;
108 for (;;)
109 {
110 ret[count++] = p;
111 if (!(p = strchrW( p, ';' ))) break;
112 *p++ = 0;
113 }
114 ret[count++] = NULL;
115 }
116 return ret;
117 }
118
119
120 /***********************************************************************
121 * RELAY16_InitDebugLists
122 *
123 * Build the relay include/exclude function lists.
124 */
125 void RELAY16_InitDebugLists(void)
126 {
127 OBJECT_ATTRIBUTES attr;
128 UNICODE_STRING name;
129 char buffer[1024];
130 HANDLE root, hkey;
131 DWORD count;
132 WCHAR *str;
133 static const WCHAR configW[] = {'S','o','f','t','w','a','r','e','\\',
134 'W','i','n','e','\\',
135 'D','e','b','u','g',0};
136 static const WCHAR RelayIncludeW[] = {'R','e','l','a','y','I','n','c','l','u','d','e',0};
137 static const WCHAR RelayExcludeW[] = {'R','e','l','a','y','E','x','c','l','u','d','e',0};
138 static const WCHAR SnoopIncludeW[] = {'S','n','o','o','p','I','n','c','l','u','d','e',0};
139 static const WCHAR SnoopExcludeW[] = {'S','n','o','o','p','E','x','c','l','u','d','e',0};
140
141 RtlOpenCurrentUser( KEY_READ, &root );
142 attr.Length = sizeof(attr);
143 attr.RootDirectory = root;
144 attr.ObjectName = &name;
145 attr.Attributes = 0;
146 attr.SecurityDescriptor = NULL;
147 attr.SecurityQualityOfService = NULL;
148 RtlInitUnicodeString( &name, configW );
149
150 /* @@ Wine registry key: HKCU\Software\Wine\Debug */
151 if (NtOpenKey( &hkey, KEY_READ, &attr )) hkey = 0;
152 NtClose( root );
153 if (!hkey) return;
154
155 str = (WCHAR *)((KEY_VALUE_PARTIAL_INFORMATION *)buffer)->Data;
156 RtlInitUnicodeString( &name, RelayIncludeW );
157 if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
158 {
159 debug_relay_includelist = build_list( str );
160 }
161
162 RtlInitUnicodeString( &name, RelayExcludeW );
163 if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
164 {
165 debug_relay_excludelist = build_list( str );
166 }
167
168 RtlInitUnicodeString( &name, SnoopIncludeW );
169 if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
170 {
171 debug_snoop_includelist = build_list( str );
172 }
173
174 RtlInitUnicodeString( &name, SnoopExcludeW );
175 if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
176 {
177 debug_snoop_excludelist = build_list( str );
178 }
179 NtClose( hkey );
180 }
181
182
183 /***********************************************************************
184 * check_list
185 *
186 * Check if a given module and function is in the list.
187 */
188 static BOOL check_list( const char *module, int ordinal, const char *func, const WCHAR **list )
189 {
190 char ord_str[10];
191
192 sprintf( ord_str, "%d", ordinal );
193 for(; *list; list++)
194 {
195 const WCHAR *p = strrchrW( *list, '.' );
196 if (p && p > *list) /* check module and function */
197 {
198 int len = p - *list;
199 if (strncmpiAW( module, *list, len-1 ) || module[len]) continue;
200 if (p[1] == '*' && !p[2]) return TRUE;
201 if (!strcmpiAW( ord_str, p + 1 )) return TRUE;
202 if (func && !strcmpiAW( func, p + 1 )) return TRUE;
203 }
204 else /* function only */
205 {
206 if (func && !strcmpiAW( func, *list )) return TRUE;
207 }
208 }
209 return FALSE;
210 }
211
212
213 /***********************************************************************
214 * RELAY_ShowDebugmsgRelay
215 *
216 * Simple function to decide if a particular debugging message is
217 * wanted.
218 */
219 static BOOL RELAY_ShowDebugmsgRelay(const char *module, int ordinal, const char *func)
220 {
221 if (debug_relay_excludelist && check_list( module, ordinal, func, debug_relay_excludelist ))
222 return FALSE;
223 if (debug_relay_includelist && !check_list( module, ordinal, func, debug_relay_includelist ))
224 return FALSE;
225 return TRUE;
226 }
227
228
229 /***********************************************************************
230 * SNOOP16_ShowDebugmsgSnoop
231 *
232 * Simple function to decide if a particular debugging message is
233 * wanted.
234 */
235 BOOL SNOOP16_ShowDebugmsgSnoop(const char *module, int ordinal, const char *func)
236 {
237 if (debug_snoop_excludelist && check_list( module, ordinal, func, debug_snoop_excludelist ))
238 return FALSE;
239 if (debug_snoop_includelist && !check_list( module, ordinal, func, debug_snoop_includelist ))
240 return FALSE;
241 return TRUE;
242 }
243
244
245 /***********************************************************************
246 * get_entry_point
247 *
248 * Return the ordinal, name, and type info corresponding to a CS:IP address.
249 */
250 static const CALLFROM16 *get_entry_point( STACK16FRAME *frame, LPSTR module, LPSTR func, WORD *pOrd )
251 {
252 WORD i, max_offset;
253 register BYTE *p;
254 NE_MODULE *pModule;
255 ET_BUNDLE *bundle;
256 ET_ENTRY *entry;
257
258 *pOrd = 0;
259 if (!(pModule = NE_GetPtr( FarGetOwner16( GlobalHandle16( frame->module_cs ) ))))
260 return NULL;
261
262 max_offset = 0;
263 bundle = (ET_BUNDLE *)((BYTE *)pModule + pModule->ne_enttab);
264 do
265 {
266 entry = (ET_ENTRY *)((BYTE *)bundle+6);
267 for (i = bundle->first + 1; i <= bundle->last; i++)
268 {
269 if ((entry->offs < frame->entry_ip)
270 && (entry->segnum == 1) /* code segment ? */
271 && (entry->offs >= max_offset))
272 {
273 max_offset = entry->offs;
274 *pOrd = i;
275 }
276 entry++;
277 }
278 } while ( (bundle->next)
279 && (bundle = (ET_BUNDLE *)((BYTE *)pModule+bundle->next)));
280
281 /* Search for the name in the resident names table */
282 /* (built-in modules have no non-resident table) */
283
284 p = (BYTE *)pModule + pModule->ne_restab;
285 memcpy( module, p + 1, *p );
286 module[*p] = 0;
287
288 while (*p)
289 {
290 p += *p + 1 + sizeof(WORD);
291 if (*(WORD *)(p + *p + 1) == *pOrd) break;
292 }
293 memcpy( func, p + 1, *p );
294 func[*p] = 0;
295
296 /* Retrieve entry point call structure */
297 p = MapSL( MAKESEGPTR( frame->module_cs, frame->callfrom_ip ) );
298 /* p now points to lret, get the start of CALLFROM16 structure */
299 return (CALLFROM16 *)(p - FIELD_OFFSET( CALLFROM16, ret ));
300 }
301
302
303 extern int call_entry_point( void *func, int nb_args, const int *args );
304 __ASM_GLOBAL_FUNC( call_entry_point,
305 "pushl %ebp\n\t"
306 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
307 __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
308 "movl %esp,%ebp\n\t"
309 __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
310 "pushl %esi\n\t"
311 __ASM_CFI(".cfi_rel_offset %esi,-4\n\t")
312 "pushl %edi\n\t"
313 __ASM_CFI(".cfi_rel_offset %edi,-8\n\t")
314 "movl 12(%ebp),%edx\n\t"
315 "shll $2,%edx\n\t"
316 "jz 1f\n\t"
317 "subl %edx,%esp\n\t"
318 "andl $~15,%esp\n\t"
319 "movl 12(%ebp),%ecx\n\t"
320 "movl 16(%ebp),%esi\n\t"
321 "movl %esp,%edi\n\t"
322 "cld\n\t"
323 "rep; movsl\n"
324 "1:\tcall *8(%ebp)\n\t"
325 "leal -8(%ebp),%esp\n\t"
326 "popl %edi\n\t"
327 __ASM_CFI(".cfi_same_value %edi\n\t")
328 "popl %esi\n\t"
329 __ASM_CFI(".cfi_same_value %esi\n\t")
330 "popl %ebp\n\t"
331 __ASM_CFI(".cfi_def_cfa %esp,4\n\t")
332 __ASM_CFI(".cfi_same_value %ebp\n\t")
333 "ret" )
334
335
336 /***********************************************************************
337 * relay_call_from_16_no_debug
338 *
339 * Same as relay_call_from_16 but doesn't print any debug information.
340 */
341 static int relay_call_from_16_no_debug( void *entry_point, unsigned char *args16, CONTEXT *context,
342 const CALLFROM16 *call )
343 {
344 unsigned int i, j, nb_args = 0;
345 int args32[20];
346
347 /* look for the ret instruction */
348 for (j = 0; j < ARRAY_SIZE(call->ret); j++)
349 if (call->ret[j] == 0xca66 || call->ret[j] == 0xcb66) break;
350
351 if (call->ret[j] == 0xcb66) /* cdecl */
352 {
353 for (i = 0; i < 20; i++, nb_args++)
354 {
355 int type = (call->arg_types[i / 10] >> (3 * (i % 10))) & 7;
356
357 if (type == ARG_NONE) break;
358 switch(type)
359 {
360 case ARG_WORD:
361 args32[nb_args] = *(WORD *)args16;
362 args16 += sizeof(WORD);
363 break;
364 case ARG_SWORD:
365 args32[nb_args] = *(short *)args16;
366 args16 += sizeof(WORD);
367 break;
368 case ARG_LONG:
369 case ARG_SEGSTR:
370 args32[nb_args] = *(int *)args16;
371 args16 += sizeof(int);
372 break;
373 case ARG_PTR:
374 case ARG_STR:
375 args32[nb_args] = (int)MapSL( *(SEGPTR *)args16 );
376 args16 += sizeof(SEGPTR);
377 break;
378 case ARG_VARARG:
379 args32[nb_args] = (int)args16;
380 break;
381 default:
382 break;
383 }
384 }
385 }
386 else /* not cdecl */
387 {
388 /* Start with the last arg */
389 args16 += call->ret[j + 1];
390 for (i = 0; i < 20; i++, nb_args++)
391 {
392 int type = (call->arg_types[i / 10] >> (3 * (i % 10))) & 7;
393
394 if (type == ARG_NONE) break;
395 switch(type)
396 {
397 case ARG_WORD:
398 args16 -= sizeof(WORD);
399 args32[nb_args] = *(WORD *)args16;
400 break;
401 case ARG_SWORD:
402 args16 -= sizeof(WORD);
403 args32[nb_args] = *(short *)args16;
404 break;
405 case ARG_LONG:
406 case ARG_SEGSTR:
407 args16 -= sizeof(int);
408 args32[nb_args] = *(int *)args16;
409 break;
410 case ARG_PTR:
411 case ARG_STR:
412 args16 -= sizeof(SEGPTR);
413 args32[nb_args] = (int)MapSL( *(SEGPTR *)args16 );
414 break;
415 default:
416 break;
417 }
418 }
419 }
420
421 if (!j) /* register function */
422 args32[nb_args++] = (int)context;
423
424 SYSLEVEL_CheckNotLevel( 2 );
425
426 return call_entry_point( entry_point, nb_args, args32 );
427 }
428
429
430 /***********************************************************************
431 * relay_call_from_16
432 *
433 * Replacement for the 16-bit relay functions when relay debugging is on.
434 */
435 int relay_call_from_16( void *entry_point, unsigned char *args16, CONTEXT *context )
436 {
437 STACK16FRAME *frame;
438 WORD ordinal;
439 unsigned int i, j, nb_args = 0;
440 int ret_val, args32[20];
441 char module[10], func[64];
442 const CALLFROM16 *call;
443
444 frame = CURRENT_STACK16;
445 call = get_entry_point( frame, module, func, &ordinal );
446 if (!TRACE_ON(relay) || !RELAY_ShowDebugmsgRelay( module, ordinal, func ))
447 return relay_call_from_16_no_debug( entry_point, args16, context, call );
448
449 TRACE( "\1Call %s.%d: %s(", module, ordinal, func );
450
451 /* look for the ret instruction */
452 for (j = 0; j < ARRAY_SIZE(call->ret); j++)
453 if (call->ret[j] == 0xca66 || call->ret[j] == 0xcb66) break;
454
455 if (call->ret[j] == 0xcb66) /* cdecl */
456 {
457 for (i = 0; i < 20; i++, nb_args++)
458 {
459 int type = (call->arg_types[i / 10] >> (3 * (i % 10))) & 7;
460
461 if (type == ARG_NONE) break;
462 if (i) TRACE( "," );
463 switch(type)
464 {
465 case ARG_WORD:
466 TRACE( "%04x", *(WORD *)args16 );
467 args32[nb_args] = *(WORD *)args16;
468 args16 += sizeof(WORD);
469 break;
470 case ARG_SWORD:
471 TRACE( "%04x", *(WORD *)args16 );
472 args32[nb_args] = *(short *)args16;
473 args16 += sizeof(WORD);
474 break;
475 case ARG_LONG:
476 TRACE( "%08x", *(int *)args16 );
477 args32[nb_args] = *(int *)args16;
478 args16 += sizeof(int);
479 break;
480 case ARG_PTR:
481 TRACE( "%04x:%04x", *(WORD *)(args16+2), *(WORD *)args16 );
482 args32[nb_args] = (int)MapSL( *(SEGPTR *)args16 );
483 args16 += sizeof(SEGPTR);
484 break;
485 case ARG_STR:
486 TRACE( "%08x %s", *(int *)args16, debugstr_a( MapSL(*(SEGPTR *)args16 )));
487 args32[nb_args] = (int)MapSL( *(SEGPTR *)args16 );
488 args16 += sizeof(int);
489 break;
490 case ARG_SEGSTR:
491 TRACE( "%04x:%04x %s", *(WORD *)(args16+2), *(WORD *)args16,
492 debugstr_a( MapSL(*(SEGPTR *)args16 )) );
493 args32[nb_args] = *(SEGPTR *)args16;
494 args16 += sizeof(SEGPTR);
495 break;
496 case ARG_VARARG:
497 TRACE( "..." );
498 args32[nb_args] = (int)args16;
499 break;
500 default:
501 break;
502 }
503 }
504 }
505 else /* not cdecl */
506 {
507 /* Start with the last arg */
508 args16 += call->ret[j + 1];
509 for (i = 0; i < 20; i++, nb_args++)
510 {
511 int type = (call->arg_types[i / 10] >> (3 * (i % 10))) & 7;
512
513 if (type == ARG_NONE) break;
514 if (i) TRACE( "," );
515 switch(type)
516 {
517 case ARG_WORD:
518 args16 -= sizeof(WORD);
519 args32[nb_args] = *(WORD *)args16;
520 TRACE( "%04x", *(WORD *)args16 );
521 break;
522 case ARG_SWORD:
523 args16 -= sizeof(WORD);
524 args32[nb_args] = *(short *)args16;
525 TRACE( "%04x", *(WORD *)args16 );
526 break;
527 case ARG_LONG:
528 args16 -= sizeof(int);
529 args32[nb_args] = *(int *)args16;
530 TRACE( "%08x", *(int *)args16 );
531 break;
532 case ARG_PTR:
533 args16 -= sizeof(SEGPTR);
534 args32[nb_args] = (int)MapSL( *(SEGPTR *)args16 );
535 TRACE( "%04x:%04x", *(WORD *)(args16+2), *(WORD *)args16 );
536 break;
537 case ARG_STR:
538 args16 -= sizeof(int);
539 args32[nb_args] = (int)MapSL( *(SEGPTR *)args16 );
540 TRACE( "%08x %s", *(int *)args16, debugstr_a( MapSL(*(SEGPTR *)args16 )));
541 break;
542 case ARG_SEGSTR:
543 args16 -= sizeof(SEGPTR);
544 args32[nb_args] = *(SEGPTR *)args16;
545 TRACE( "%04x:%04x %s", *(WORD *)(args16+2), *(WORD *)args16,
546 debugstr_a( MapSL(*(SEGPTR *)args16 )) );
547 break;
548 case ARG_VARARG:
549 TRACE( "..." );
550 args32[nb_args] = (int)args16;
551 break;
552 default:
553 break;
554 }
555 }
556 }
557
558 if (!j) /* register function */
559 {
560 args32[nb_args++] = (int)context;
561 TRACE( ") ret=%04x:%04x ax=%04x bx=%04x cx=%04x dx=%04x si=%04x di=%04x ds=%04x es=%04x efl=%08x\n",
562 frame->cs, frame->ip, (WORD)context->Eax, (WORD)context->Ebx, (WORD)context->Ecx,
563 (WORD)context->Edx, (WORD)context->Esi, (WORD)context->Edi, (WORD)context->SegDs,
564 (WORD)context->SegEs, context->EFlags );
565 }
566 else TRACE( ") ret=%04x:%04x ds=%04x\n", frame->cs, frame->ip, frame->ds );
567
568 SYSLEVEL_CheckNotLevel( 2 );
569
570 ret_val = call_entry_point( entry_point, nb_args, args32 );
571
572 SYSLEVEL_CheckNotLevel( 2 );
573
574 TRACE( "\1Ret %s.%d: %s() ", module, ordinal, func );
575 if (!j) /* register function */
576 {
577 TRACE( "retval=none ret=%04x:%04x ax=%04x bx=%04x cx=%04x dx=%04x si=%04x di=%04x ds=%04x es=%04x efl=%08x\n",
578 (WORD)context->SegCs, LOWORD(context->Eip), (WORD)context->Eax, (WORD)context->Ebx,
579 (WORD)context->Ecx, (WORD)context->Edx, (WORD)context->Esi, (WORD)context->Edi,
580 (WORD)context->SegDs, (WORD)context->SegEs, context->EFlags );
581 }
582 else
583 {
584 frame = CURRENT_STACK16; /* might have be changed by the entry point */
585 if (j == 1) /* 16-bit return sequence */
586 TRACE( "retval=%04x ret=%04x:%04x ds=%04x\n",
587 ret_val & 0xffff, frame->cs, frame->ip, frame->ds );
588 else
589 TRACE( "retval=%08x ret=%04x:%04x ds=%04x\n",
590 ret_val, frame->cs, frame->ip, frame->ds );
591 }
592 return ret_val;
593 }
594
595 /**********************************************************************
596 * RELAY_GetPointer
597 *
598 * Get pointer to stack block when given esp pointing to 16-bit stack
599 * inside relay data segment.
600 */
601 static RELAY_Stack16 *RELAY_GetPointer( DWORD offset )
602 {
603 offset = offset / sizeof(RELAY_Stack16) * sizeof(RELAY_Stack16);
604 return MapSL(MAKESEGPTR(DOSVM_dpmi_segments->relay_data_sel, offset));
605 }
606
607
608 /**********************************************************************
609 * RELAY_MakeShortContext
610 *
611 * Allocate separate 16-bit stack, make stack pointer point to this
612 * stack and make code pointer point to stub that restores everything.
613 * So, after this routine, SS and CS are guaranteed to be 16-bit.
614 *
615 * Note: This might be called from signal handler, so the stack
616 * allocation algorithm must be signal safe.
617 */
618 static void RELAY_MakeShortContext( CONTEXT *context )
619 {
620 DWORD offset = offsetof(RELAY_Stack16, stack_top);
621 RELAY_Stack16 *stack = RELAY_GetPointer( 0 );
622
623 while (stack->inuse && offset < DOSVM_RELAY_DATA_SIZE) {
624 stack++;
625 offset += sizeof(RELAY_Stack16);
626 }
627
628 if (offset >= DOSVM_RELAY_DATA_SIZE)
629 ERR( "Too many nested interrupts!\n" );
630
631 stack->inuse = 1;
632 stack->eip = context->Eip;
633 stack->seg_cs = context->SegCs;
634 stack->esp = context->Esp;
635 stack->seg_ss = context->SegSs;
636
637 stack->stack_bottom = RELAY_MAGIC;
638 stack->stack_top = RELAY_MAGIC;
639
640 context->SegSs = DOSVM_dpmi_segments->relay_data_sel;
641 context->Esp = offset;
642 context->SegCs = DOSVM_dpmi_segments->relay_code_sel;
643 context->Eip = 3;
644 }
645
646
647 /**********************************************************************
648 * RELAY_RelayStub
649 *
650 * This stub is called by __wine_call_from_16_regs in order to marshall
651 * relay parameters.
652 */
653 static void __stdcall RELAY_RelayStub( DOSRELAY proc, unsigned char *args, CONTEXT *context )
654 {
655 if (proc)
656 {
657 RELAY_Stack16 *stack = RELAY_GetPointer( context->Esp );
658
659 DWORD old_seg_cs = context->SegCs;
660 DWORD old_eip = context->Eip;
661 DWORD old_seg_ss = context->SegSs;
662 DWORD old_esp = context->Esp;
663
664 context->SegCs = stack->seg_cs;
665 context->Eip = stack->eip;
666 context->SegSs = stack->seg_ss;
667 context->Esp = stack->esp;
668
669 proc( context, *(LPVOID *)args );
670
671 stack->seg_cs = context->SegCs;
672 stack->eip = context->Eip;
673 stack->seg_ss = context->SegSs;
674 stack->esp = context->Esp;
675
676 context->SegCs = old_seg_cs;
677 context->Eip = old_eip;
678 context->SegSs = old_seg_ss;
679 context->Esp = old_esp;
680 }
681 }
682
683
684 /**********************************************************************
685 * DOSVM_RelayHandler
686 *
687 * Restore saved code and stack pointers and release stack block.
688 */
689 void DOSVM_RelayHandler( CONTEXT *context )
690 {
691 RELAY_Stack16 *stack = RELAY_GetPointer( context->Esp );
692
693 context->SegSs = stack->seg_ss;
694 context->Esp = stack->esp;
695 context->SegCs = stack->seg_cs;
696 context->Eip = stack->eip;
697
698 if (!stack->inuse ||
699 stack->stack_bottom != RELAY_MAGIC ||
700 stack->stack_top != RELAY_MAGIC)
701 ERR( "Stack corrupted!\n" );
702
703 stack->inuse = 0;
704 }
705
706
707 /**********************************************************************
708 * DOSVM_BuildCallFrame
709 *
710 * Modifies the context so that return to context calls DOSRELAY and
711 * only after return from DOSRELAY the original context will be returned to.
712 */
713 void DOSVM_BuildCallFrame( CONTEXT *context, DOSRELAY relay, LPVOID data )
714 {
715 WORD code_sel = DOSVM_dpmi_segments->relay_code_sel;
716
717 /*
718 * Allocate separate stack for relay call.
719 */
720 RELAY_MakeShortContext( context );
721
722 /*
723 * Build call frame.
724 */
725 PUSH_WORD16( context, HIWORD(data) ); /* argument.hiword */
726 PUSH_WORD16( context, LOWORD(data) ); /* argument.loword */
727 PUSH_WORD16( context, context->SegCs ); /* STACK16FRAME.cs */
728 PUSH_WORD16( context, LOWORD(context->Eip) ); /* STACK16FRAME.ip */
729 PUSH_WORD16( context, LOWORD(context->Ebp) ); /* STACK16FRAME.bp */
730 PUSH_WORD16( context, HIWORD(relay) ); /* STACK16FRAME.entry_point.hiword */
731 PUSH_WORD16( context, LOWORD(relay) ); /* STACK16FRAME.entry_point.loword */
732 PUSH_WORD16( context, 0 ); /* STACK16FRAME.entry_ip */
733 PUSH_WORD16( context, HIWORD(RELAY_RelayStub) ); /* STACK16FRAME.relay.hiword */
734 PUSH_WORD16( context, LOWORD(RELAY_RelayStub) ); /* STACK16FRAME.relay.loword */
735 PUSH_WORD16( context, 0 ); /* STACK16FRAME.module_cs.hiword */
736 PUSH_WORD16( context, code_sel ); /* STACK16FRAME.module_cs.loword */
737 PUSH_WORD16( context, 0 ); /* STACK16FRAME.callfrom_ip.hiword */
738 PUSH_WORD16( context, 0 ); /* STACK16FRAME.callfrom_ip.loword */
739
740 /*
741 * Adjust code pointer.
742 */
743 context->SegCs = wine_get_cs();
744 context->Eip = (DWORD)__wine_call_from_16_regs;
745 }
Windows API implementation