2 * Selector manipulation functions
4 * Copyright 1995 Alexandre Julliard
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.
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.
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
22 #include "wine/port.h"
26 #include "wine/winbase16.h"
27 #include "wine/server.h"
28 #include "wine/debug.h"
29 #include "kernel16_private.h"
31 WINE_DEFAULT_DEBUG_CHANNEL(selector
);
35 /* get the number of selectors needed to cover up to the selector limit */
36 static inline WORD
get_sel_count( WORD sel
)
38 return (wine_ldt_copy
.limit
[sel
>> __AHSHIFT
] >> 16) + 1;
42 /***********************************************************************
43 * AllocSelectorArray (KERNEL.206)
45 WORD WINAPI
AllocSelectorArray16( WORD count
)
47 WORD i
, sel
= wine_ldt_alloc_entries( count
);
52 wine_ldt_set_base( &entry
, 0 );
53 wine_ldt_set_limit( &entry
, 1 ); /* avoid 0 base and limit */
54 wine_ldt_set_flags( &entry
, WINE_LDT_FLAGS_DATA
);
55 for (i
= 0; i
< count
; i
++) wine_ldt_set_entry( sel
+ (i
<< __AHSHIFT
), &entry
);
61 /***********************************************************************
62 * AllocSelector (KERNEL.175)
64 WORD WINAPI
AllocSelector16( WORD sel
)
66 WORD newsel
, count
, i
;
68 count
= sel
? get_sel_count(sel
) : 1;
69 newsel
= wine_ldt_alloc_entries( count
);
70 TRACE("(%04x): returning %04x\n", sel
, newsel
);
71 if (!newsel
) return 0;
72 if (!sel
) return newsel
; /* nothing to copy */
73 for (i
= 0; i
< count
; i
++)
76 wine_ldt_get_entry( sel
+ (i
<< __AHSHIFT
), &entry
);
77 wine_ldt_set_entry( newsel
+ (i
<< __AHSHIFT
), &entry
);
83 /***********************************************************************
84 * FreeSelector (KERNEL.176)
86 WORD WINAPI
FreeSelector16( WORD sel
)
90 wine_ldt_get_entry( sel
, &entry
);
91 if (wine_ldt_is_empty( &entry
)) return sel
; /* error */
92 /* Check if we are freeing current %fs selector */
93 if (!((wine_get_fs() ^ sel
) & ~3))
94 WARN("Freeing %%fs selector (%04x), not good.\n", wine_get_fs() );
95 wine_ldt_free_entries( sel
, 1 );
100 /***********************************************************************
101 * SELECTOR_SetEntries
103 * Set the LDT entries for an array of selectors.
105 static void SELECTOR_SetEntries( WORD sel
, const void *base
, DWORD size
, unsigned char flags
)
110 wine_ldt_set_base( &entry
, base
);
111 wine_ldt_set_limit( &entry
, size
- 1 );
112 wine_ldt_set_flags( &entry
, flags
);
113 count
= (size
+ 0xffff) / 0x10000;
114 for (i
= 0; i
< count
; i
++)
116 wine_ldt_set_entry( sel
+ (i
<< __AHSHIFT
), &entry
);
117 wine_ldt_set_base( &entry
, (char*)wine_ldt_get_base(&entry
) + 0x10000);
118 /* yep, Windows sets limit like that, not 64K sel units */
119 wine_ldt_set_limit( &entry
, wine_ldt_get_limit(&entry
) - 0x10000 );
124 /***********************************************************************
125 * SELECTOR_AllocBlock
127 * Allocate selectors for a block of linear memory.
129 WORD
SELECTOR_AllocBlock( const void *base
, DWORD size
, unsigned char flags
)
134 count
= (size
+ 0xffff) / 0x10000;
135 sel
= wine_ldt_alloc_entries( count
);
136 if (sel
) SELECTOR_SetEntries( sel
, base
, size
, flags
);
141 /***********************************************************************
144 * Free a block of selectors.
146 void SELECTOR_FreeBlock( WORD sel
)
148 WORD i
, count
= get_sel_count( sel
);
150 TRACE("(%04x,%d)\n", sel
, count
);
151 for (i
= 0; i
< count
; i
++) FreeSelector16( sel
+ (i
<< __AHSHIFT
) );
155 /***********************************************************************
156 * SELECTOR_ReallocBlock
158 * Change the size of a block of selectors.
160 WORD
SELECTOR_ReallocBlock( WORD sel
, const void *base
, DWORD size
)
163 int oldcount
, newcount
;
166 wine_ldt_get_entry( sel
, &entry
);
167 oldcount
= (wine_ldt_get_limit(&entry
) >> 16) + 1;
168 newcount
= (size
+ 0xffff) >> 16;
170 sel
= wine_ldt_realloc_entries( sel
, oldcount
, newcount
);
171 if (sel
) SELECTOR_SetEntries( sel
, base
, size
, wine_ldt_get_flags(&entry
) );
176 /***********************************************************************
177 * PrestoChangoSelector (KERNEL.177)
179 WORD WINAPI
PrestoChangoSelector16( WORD selSrc
, WORD selDst
)
182 wine_ldt_get_entry( selSrc
, &entry
);
183 /* toggle the executable bit */
184 entry
.HighWord
.Bits
.Type
^= (WINE_LDT_FLAGS_CODE
^ WINE_LDT_FLAGS_DATA
);
185 wine_ldt_set_entry( selDst
, &entry
);
190 /***********************************************************************
191 * AllocCStoDSAlias (KERNEL.170)
192 * AllocAlias (KERNEL.172)
194 WORD WINAPI
AllocCStoDSAlias16( WORD sel
)
199 newsel
= wine_ldt_alloc_entries( 1 );
200 TRACE("(%04x): returning %04x\n",
202 if (!newsel
) return 0;
203 wine_ldt_get_entry( sel
, &entry
);
204 entry
.HighWord
.Bits
.Type
= WINE_LDT_FLAGS_DATA
;
205 wine_ldt_set_entry( newsel
, &entry
);
210 /***********************************************************************
211 * AllocDStoCSAlias (KERNEL.171)
213 WORD WINAPI
AllocDStoCSAlias16( WORD sel
)
218 newsel
= wine_ldt_alloc_entries( 1 );
219 TRACE("(%04x): returning %04x\n",
221 if (!newsel
) return 0;
222 wine_ldt_get_entry( sel
, &entry
);
223 entry
.HighWord
.Bits
.Type
= WINE_LDT_FLAGS_CODE
;
224 wine_ldt_set_entry( newsel
, &entry
);
229 /***********************************************************************
230 * LongPtrAdd (KERNEL.180)
232 void WINAPI
LongPtrAdd16( DWORD ptr
, DWORD add
)
235 wine_ldt_get_entry( SELECTOROF(ptr
), &entry
);
236 wine_ldt_set_base( &entry
, (char *)wine_ldt_get_base(&entry
) + add
);
237 wine_ldt_set_entry( SELECTOROF(ptr
), &entry
);
241 /***********************************************************************
242 * GetSelectorBase (KERNEL.186)
244 DWORD WINAPI
GetSelectorBase( WORD sel
)
246 void *base
= wine_ldt_copy
.base
[sel
>> __AHSHIFT
];
248 /* if base points into DOSMEM, assume we have to
249 * return pointer into physical lower 1MB */
251 return DOSMEM_MapLinearToDos( base
);
255 /***********************************************************************
256 * SetSelectorBase (KERNEL.187)
258 WORD WINAPI
SetSelectorBase( WORD sel
, DWORD base
)
261 wine_ldt_get_entry( sel
, &entry
);
262 wine_ldt_set_base( &entry
, DOSMEM_MapDosToLinear(base
) );
263 wine_ldt_set_entry( sel
, &entry
);
268 /***********************************************************************
269 * GetSelectorLimit (KERNEL.188)
271 DWORD WINAPI
GetSelectorLimit16( WORD sel
)
273 return wine_ldt_copy
.limit
[sel
>> __AHSHIFT
];
277 /***********************************************************************
278 * SetSelectorLimit (KERNEL.189)
280 WORD WINAPI
SetSelectorLimit16( WORD sel
, DWORD limit
)
283 wine_ldt_get_entry( sel
, &entry
);
284 wine_ldt_set_limit( &entry
, limit
);
285 wine_ldt_set_entry( sel
, &entry
);
290 /***********************************************************************
291 * SelectorAccessRights (KERNEL.196)
293 WORD WINAPI
SelectorAccessRights16( WORD sel
, WORD op
, WORD val
)
296 wine_ldt_get_entry( sel
, &entry
);
298 if (op
== 0) /* get */
300 return entry
.HighWord
.Bytes
.Flags1
| ((entry
.HighWord
.Bytes
.Flags2
<< 8) & 0xf0);
304 entry
.HighWord
.Bytes
.Flags1
= LOBYTE(val
) | 0xf0;
305 entry
.HighWord
.Bytes
.Flags2
= (entry
.HighWord
.Bytes
.Flags2
& 0x0f) | (HIBYTE(val
) & 0xf0);
306 wine_ldt_set_entry( sel
, &entry
);
312 /***********************************************************************
313 * IsBadCodePtr (KERNEL.336)
315 BOOL16 WINAPI
IsBadCodePtr16( SEGPTR lpfn
)
320 sel
= SELECTOROF(lpfn
);
321 if (!sel
) return TRUE
;
322 wine_ldt_get_entry( sel
, &entry
);
323 if (wine_ldt_is_empty( &entry
)) return TRUE
;
324 /* check for code segment, ignoring conforming, read-only and accessed bits */
325 if ((entry
.HighWord
.Bits
.Type
^ WINE_LDT_FLAGS_CODE
) & 0x18) return TRUE
;
326 if (OFFSETOF(lpfn
) > wine_ldt_get_limit(&entry
)) return TRUE
;
331 /***********************************************************************
332 * IsBadStringPtr (KERNEL.337)
334 BOOL16 WINAPI
IsBadStringPtr16( SEGPTR ptr
, UINT16 size
)
339 sel
= SELECTOROF(ptr
);
340 if (!sel
) return TRUE
;
341 wine_ldt_get_entry( sel
, &entry
);
342 if (wine_ldt_is_empty( &entry
)) return TRUE
;
343 /* check for data or readable code segment */
344 if (!(entry
.HighWord
.Bits
.Type
& 0x10)) return TRUE
; /* system descriptor */
345 if ((entry
.HighWord
.Bits
.Type
& 0x0a) == 0x08) return TRUE
; /* non-readable code segment */
346 if (strlen(MapSL(ptr
)) < size
) size
= strlen(MapSL(ptr
)) + 1;
347 if (size
&& (OFFSETOF(ptr
) + size
- 1 > wine_ldt_get_limit(&entry
))) return TRUE
;
352 /***********************************************************************
353 * IsBadHugeReadPtr (KERNEL.346)
355 BOOL16 WINAPI
IsBadHugeReadPtr16( SEGPTR ptr
, DWORD size
)
360 sel
= SELECTOROF(ptr
);
361 if (!sel
) return TRUE
;
362 wine_ldt_get_entry( sel
, &entry
);
363 if (wine_ldt_is_empty( &entry
)) return TRUE
;
364 /* check for data or readable code segment */
365 if (!(entry
.HighWord
.Bits
.Type
& 0x10)) return TRUE
; /* system descriptor */
366 if ((entry
.HighWord
.Bits
.Type
& 0x0a) == 0x08) return TRUE
; /* non-readable code segment */
367 if (size
&& (OFFSETOF(ptr
) + size
- 1 > wine_ldt_get_limit( &entry
))) return TRUE
;
372 /***********************************************************************
373 * IsBadHugeWritePtr (KERNEL.347)
375 BOOL16 WINAPI
IsBadHugeWritePtr16( SEGPTR ptr
, DWORD size
)
380 sel
= SELECTOROF(ptr
);
381 if (!sel
) return TRUE
;
382 wine_ldt_get_entry( sel
, &entry
);
383 if (wine_ldt_is_empty( &entry
)) return TRUE
;
384 /* check for writable data segment, ignoring expand-down and accessed flags */
385 if ((entry
.HighWord
.Bits
.Type
^ WINE_LDT_FLAGS_DATA
) & ~5) return TRUE
;
386 if (size
&& (OFFSETOF(ptr
) + size
- 1 > wine_ldt_get_limit( &entry
))) return TRUE
;
390 /***********************************************************************
391 * IsBadReadPtr (KERNEL.334)
393 BOOL16 WINAPI
IsBadReadPtr16( SEGPTR ptr
, UINT16 size
)
395 return IsBadHugeReadPtr16( ptr
, size
);
399 /***********************************************************************
400 * IsBadWritePtr (KERNEL.335)
402 BOOL16 WINAPI
IsBadWritePtr16( SEGPTR ptr
, UINT16 size
)
404 return IsBadHugeWritePtr16( ptr
, size
);
408 /***********************************************************************
409 * IsBadFlatReadWritePtr (KERNEL.627)
411 BOOL16 WINAPI
IsBadFlatReadWritePtr16( SEGPTR ptr
, DWORD size
, BOOL16 bWrite
)
413 return bWrite
? IsBadHugeWritePtr16( ptr
, size
)
414 : IsBadHugeReadPtr16( ptr
, size
);
418 /************************************* Win95 pointer mapping functions *
424 struct mapls_entry
*next
;
425 void *addr
; /* linear address */
426 int count
; /* ref count */
427 WORD sel
; /* selector */
430 static struct mapls_entry
*first_entry
;
433 /***********************************************************************
437 * Maps linear pointer to segmented.
439 SEGPTR WINAPI
MapLS( LPCVOID ptr
)
441 struct mapls_entry
*entry
, *free
= NULL
;
445 if (!HIWORD(ptr
)) return (SEGPTR
)LOWORD(ptr
);
447 base
= (const char *)ptr
- ((ULONG_PTR
)ptr
& 0x7fff);
448 HeapLock( GetProcessHeap() );
449 for (entry
= first_entry
; entry
; entry
= entry
->next
)
451 if (entry
->addr
== base
) break;
452 if (!entry
->count
) free
= entry
;
457 if (!free
) /* no free entry found, create a new one */
459 if (!(free
= HeapAlloc( GetProcessHeap(), 0, sizeof(*free
) ))) goto done
;
460 if (!(free
->sel
= SELECTOR_AllocBlock( base
, 0x10000, WINE_LDT_FLAGS_DATA
)))
462 HeapFree( GetProcessHeap(), 0, free
);
466 free
->next
= first_entry
;
469 SetSelectorBase( free
->sel
, (DWORD
)base
);
470 free
->addr
= (void*)base
;
474 ret
= MAKESEGPTR( entry
->sel
, (const char *)ptr
- (char *)entry
->addr
);
476 HeapUnlock( GetProcessHeap() );
480 /***********************************************************************
481 * UnMapLS (KERNEL32.@)
482 * UnMapLS (KERNEL.359)
484 * Free mapped selector.
486 void WINAPI
UnMapLS( SEGPTR sptr
)
488 struct mapls_entry
*entry
;
489 WORD sel
= SELECTOROF(sptr
);
493 HeapLock( GetProcessHeap() );
494 for (entry
= first_entry
; entry
; entry
= entry
->next
) if (entry
->sel
== sel
) break;
495 if (entry
&& entry
->count
> 0) entry
->count
--;
496 HeapUnlock( GetProcessHeap() );
500 /***********************************************************************
504 * Maps fixed segmented pointer to linear.
506 LPVOID WINAPI
MapSL( SEGPTR sptr
)
508 return (char *)wine_ldt_copy
.base
[SELECTOROF(sptr
) >> __AHSHIFT
] + OFFSETOF(sptr
);
511 /***********************************************************************
512 * MapSLFix (KERNEL32.@)
514 * FIXME: MapSLFix and UnMapSLFixArray should probably prevent
515 * unexpected linear address change when GlobalCompact() shuffles
519 LPVOID WINAPI
MapSLFix( SEGPTR sptr
)
525 /***********************************************************************
526 * UnMapSLFixArray (KERNEL32.@)
528 * Must not change EAX, hence defined as asm function.
530 __ASM_STDCALL_FUNC( UnMapSLFixArray
, 8, "ret $8" )
532 /***********************************************************************
533 * SMapLS (KERNEL32.@)
535 __ASM_STDCALL_FUNC( SMapLS
, 0,
537 "testl $0xffff0000,%eax\n\t"
540 "call " __ASM_NAME("MapLS") __ASM_STDCALL(4) "\n\t"
544 /***********************************************************************
545 * SUnMapLS (KERNEL32.@)
547 __ASM_STDCALL_FUNC( SUnMapLS
, 0,
548 "pushl %eax\n\t" /* preserve eax */
550 "call " __ASM_NAME("UnMapLS") __ASM_STDCALL(4) "\n\t"
554 /***********************************************************************
555 * SMapLS_IP_EBP_8 (KERNEL32.@)
557 * These functions map linear pointers at [EBP+xxx] to segmented pointers
559 * Win95 uses some kind of alias structs, which it stores in [EBP+x] to
560 * unravel them at SUnMapLS. We just store the segmented pointer there.
562 __ASM_STDCALL_FUNC( SMapLS_IP_EBP_8
, 0,
563 "movl 8(%ebp),%eax\n\t"
564 "call " __ASM_NAME("SMapLS") __ASM_STDCALL(4) "\n\t"
565 "movl %edx,8(%ebp)\n\t"
568 /***********************************************************************
569 * SMapLS_IP_EBP_12 (KERNEL32.@)
571 __ASM_STDCALL_FUNC( SMapLS_IP_EBP_12
, 0,
572 "movl 12(%ebp),%eax\n\t"
573 "call " __ASM_NAME("SMapLS") __ASM_STDCALL(4) "\n\t"
574 "movl %edx,12(%ebp)\n\t"
577 /***********************************************************************
578 * SMapLS_IP_EBP_16 (KERNEL32.@)
580 __ASM_STDCALL_FUNC( SMapLS_IP_EBP_16
, 0,
581 "movl 16(%ebp),%eax\n\t"
582 "call " __ASM_NAME("SMapLS") __ASM_STDCALL(4) "\n\t"
583 "movl %edx,16(%ebp)\n\t"
586 /***********************************************************************
587 * SMapLS_IP_EBP_20 (KERNEL32.@)
589 __ASM_STDCALL_FUNC( SMapLS_IP_EBP_20
, 0,
590 "movl 20(%ebp),%eax\n\t"
591 "call " __ASM_NAME("SMapLS") __ASM_STDCALL(4) "\n\t"
592 "movl %edx,20(%ebp)\n\t"
595 /***********************************************************************
596 * SMapLS_IP_EBP_24 (KERNEL32.@)
598 __ASM_STDCALL_FUNC( SMapLS_IP_EBP_24
, 0,
599 "movl 24(%ebp),%eax\n\t"
600 "call " __ASM_NAME("SMapLS") __ASM_STDCALL(4) "\n\t"
601 "movl %edx,24(%ebp)\n\t"
604 /***********************************************************************
605 * SMapLS_IP_EBP_28 (KERNEL32.@)
607 __ASM_STDCALL_FUNC( SMapLS_IP_EBP_28
, 0,
608 "movl 28(%ebp),%eax\n\t"
609 "call " __ASM_NAME("SMapLS") __ASM_STDCALL(4) "\n\t"
610 "movl %edx,28(%ebp)\n\t"
613 /***********************************************************************
614 * SMapLS_IP_EBP_32 (KERNEL32.@)
616 __ASM_STDCALL_FUNC( SMapLS_IP_EBP_32
, 0,
617 "movl 32(%ebp),%eax\n\t"
618 "call " __ASM_NAME("SMapLS") __ASM_STDCALL(4) "\n\t"
619 "movl %edx,32(%ebp)\n\t"
622 /***********************************************************************
623 * SMapLS_IP_EBP_36 (KERNEL32.@)
625 __ASM_STDCALL_FUNC( SMapLS_IP_EBP_36
, 0,
626 "movl 36(%ebp),%eax\n\t"
627 "call " __ASM_NAME("SMapLS") __ASM_STDCALL(4) "\n\t"
628 "movl %edx,36(%ebp)\n\t"
631 /***********************************************************************
632 * SMapLS_IP_EBP_40 (KERNEL32.@)
634 __ASM_STDCALL_FUNC( SMapLS_IP_EBP_40
, 0,
635 "movl 40(%ebp),%eax\n\t"
636 "call " __ASM_NAME("SMapLS") __ASM_STDCALL(4) "\n\t"
637 "movl %edx,40(%ebp)\n\t"
640 /***********************************************************************
641 * SUnMapLS_IP_EBP_8 (KERNEL32.@)
643 __ASM_STDCALL_FUNC( SUnMapLS_IP_EBP_8
, 0,
644 "pushl %eax\n\t" /* preserve eax */
646 "call " __ASM_NAME("UnMapLS") __ASM_STDCALL(4) "\n\t"
647 "movl $0,8(%ebp)\n\t"
651 /***********************************************************************
652 * SUnMapLS_IP_EBP_12 (KERNEL32.@)
654 __ASM_STDCALL_FUNC( SUnMapLS_IP_EBP_12
, 0,
655 "pushl %eax\n\t" /* preserve eax */
657 "call " __ASM_NAME("UnMapLS") __ASM_STDCALL(4) "\n\t"
658 "movl $0,12(%ebp)\n\t"
662 /***********************************************************************
663 * SUnMapLS_IP_EBP_16 (KERNEL32.@)
665 __ASM_STDCALL_FUNC( SUnMapLS_IP_EBP_16
, 0,
666 "pushl %eax\n\t" /* preserve eax */
668 "call " __ASM_NAME("UnMapLS") __ASM_STDCALL(4) "\n\t"
669 "movl $0,16(%ebp)\n\t"
673 /***********************************************************************
674 * SUnMapLS_IP_EBP_20 (KERNEL32.@)
676 __ASM_STDCALL_FUNC( SUnMapLS_IP_EBP_20
, 0,
677 "pushl %eax\n\t" /* preserve eax */
679 "call " __ASM_NAME("UnMapLS") __ASM_STDCALL(4) "\n\t"
680 "movl $0,20(%ebp)\n\t"
684 /***********************************************************************
685 * SUnMapLS_IP_EBP_24 (KERNEL32.@)
687 __ASM_STDCALL_FUNC( SUnMapLS_IP_EBP_24
, 0,
688 "pushl %eax\n\t" /* preserve eax */
690 "call " __ASM_NAME("UnMapLS") __ASM_STDCALL(4) "\n\t"
691 "movl $0,24(%ebp)\n\t"
695 /***********************************************************************
696 * SUnMapLS_IP_EBP_28 (KERNEL32.@)
698 __ASM_STDCALL_FUNC( SUnMapLS_IP_EBP_28
, 0,
699 "pushl %eax\n\t" /* preserve eax */
701 "call " __ASM_NAME("UnMapLS") __ASM_STDCALL(4) "\n\t"
702 "movl $0,28(%ebp)\n\t"
706 /***********************************************************************
707 * SUnMapLS_IP_EBP_32 (KERNEL32.@)
709 __ASM_STDCALL_FUNC( SUnMapLS_IP_EBP_32
, 0,
710 "pushl %eax\n\t" /* preserve eax */
712 "call " __ASM_NAME("UnMapLS") __ASM_STDCALL(4) "\n\t"
713 "movl $0,32(%ebp)\n\t"
717 /***********************************************************************
718 * SUnMapLS_IP_EBP_36 (KERNEL32.@)
720 __ASM_STDCALL_FUNC( SUnMapLS_IP_EBP_36
, 0,
721 "pushl %eax\n\t" /* preserve eax */
723 "call " __ASM_NAME("UnMapLS") __ASM_STDCALL(4) "\n\t"
724 "movl $0,36(%ebp)\n\t"
728 /***********************************************************************
729 * SUnMapLS_IP_EBP_40 (KERNEL32.@)
731 __ASM_STDCALL_FUNC( SUnMapLS_IP_EBP_40
, 0,
732 "pushl %eax\n\t" /* preserve eax */
734 "call " __ASM_NAME("UnMapLS") __ASM_STDCALL(4) "\n\t"
735 "movl $0,40(%ebp)\n\t"