2 * LDT manipulation functions
4 * Copyright 1993 Robert J. Amstadt
5 * Copyright 1995 Alexandre Julliard
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include "wine/port.h"
31 #define WINE_EXPORT_LDT_COPY
32 #include "wine/library.h"
38 #ifdef HAVE_SYS_SYSCALL_H
39 # include <sys/syscall.h>
44 unsigned int entry_number
;
45 unsigned long base_addr
;
47 unsigned int seg_32bit
: 1;
48 unsigned int contents
: 2;
49 unsigned int read_exec_only
: 1;
50 unsigned int limit_in_pages
: 1;
51 unsigned int seg_not_present
: 1;
52 unsigned int useable
:1;
55 static inline int modify_ldt( int func
, struct modify_ldt_s
*ptr
,
60 __asm__
__volatile__( "pushl %%ebx\n\t"
65 : "0" (SYS_modify_ldt
),
70 __asm__
__volatile__("int $0x80"
72 : "0" (SYS_modify_ldt
),
77 if (res
>= 0) return res
;
84 #if defined(__svr4__) || defined(_SCO_DS)
85 #include <sys/sysi86.h>
86 extern int sysi86(int,void*);
92 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
93 #include <machine/segments.h>
95 extern int i386_get_ldt(int, union descriptor
*, int);
96 extern int i386_set_ldt(int, union descriptor
*, int);
97 #endif /* __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
101 /* local copy of the LDT */
102 struct __wine_ldt_copy wine_ldt_copy
;
105 /***********************************************************************
108 * Retrieve an LDT entry.
110 void wine_ldt_get_entry( unsigned short sel
, LDT_ENTRY
*entry
)
112 int index
= sel
>> 3;
113 wine_ldt_set_base( entry
, wine_ldt_copy
.base
[index
] );
114 wine_ldt_set_limit( entry
, wine_ldt_copy
.limit
[index
] );
115 wine_ldt_set_flags( entry
, wine_ldt_copy
.flags
[index
] );
119 /***********************************************************************
124 int wine_ldt_set_entry( unsigned short sel
, const LDT_ENTRY
*entry
)
126 int ret
= 0, index
= sel
>> 3;
128 /* Entry 0 must not be modified; its base and limit are always 0 */
129 if (!index
) return 0;
135 struct modify_ldt_s ldt_info
;
137 ldt_info
.entry_number
= index
;
138 ldt_info
.base_addr
= (unsigned long)wine_ldt_get_base(entry
);
139 ldt_info
.limit
= entry
->LimitLow
| (entry
->HighWord
.Bits
.LimitHi
<< 16);
140 ldt_info
.seg_32bit
= entry
->HighWord
.Bits
.Default_Big
;
141 ldt_info
.contents
= (entry
->HighWord
.Bits
.Type
>> 2) & 3;
142 ldt_info
.read_exec_only
= !(entry
->HighWord
.Bits
.Type
& 2);
143 ldt_info
.limit_in_pages
= entry
->HighWord
.Bits
.Granularity
;
144 ldt_info
.seg_not_present
= !entry
->HighWord
.Bits
.Pres
;
145 ldt_info
.useable
= entry
->HighWord
.Bits
.Sys
;
147 if ((ret
= modify_ldt(0x11, &ldt_info
, sizeof(ldt_info
))) < 0)
148 perror( "modify_ldt" );
152 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
154 LDT_ENTRY entry_copy
= *entry
;
155 /* The kernel will only let us set LDTs with user priority level */
156 if (entry_copy
.HighWord
.Bits
.Pres
157 && entry_copy
.HighWord
.Bits
.Dpl
!= 3)
158 entry_copy
.HighWord
.Bits
.Dpl
= 3;
159 ret
= i386_set_ldt(index
, (union descriptor
*)&entry_copy
, 1);
162 perror("i386_set_ldt");
163 fprintf( stderr
, "Did you reconfigure the kernel with \"options USER_LDT\"?\n" );
167 #endif /* __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
169 #if defined(__svr4__) || defined(_SCO_DS)
173 ldt_mod
.bo
= (unsigned long)wine_ldt_get_base(entry
);
174 ldt_mod
.ls
= entry
->LimitLow
| (entry
->HighWord
.Bits
.LimitHi
<< 16);
175 ldt_mod
.acc1
= entry
->HighWord
.Bytes
.Flags1
;
176 ldt_mod
.acc2
= entry
->HighWord
.Bytes
.Flags2
>> 4;
177 if ((ret
= sysi86(SI86DSCR
, &ldt_mod
)) == -1) perror("sysi86");
181 #endif /* __i386__ */
185 wine_ldt_copy
.base
[index
] = wine_ldt_get_base(entry
);
186 wine_ldt_copy
.limit
[index
] = wine_ldt_get_limit(entry
);
187 wine_ldt_copy
.flags
[index
] = (entry
->HighWord
.Bits
.Type
|
188 (entry
->HighWord
.Bits
.Default_Big
? WINE_LDT_FLAGS_32BIT
: 0) |
189 (wine_ldt_copy
.flags
[index
] & WINE_LDT_FLAGS_ALLOCATED
));
195 /***********************************************************************
196 * selector access functions
200 /* Nothing needs to be done for MS C, it will do with inline versions from the winnt.h */
201 __ASM_GLOBAL_FUNC( wine_get_cs
, "movw %cs,%ax\n\tret" )
202 __ASM_GLOBAL_FUNC( wine_get_ds
, "movw %ds,%ax\n\tret" )
203 __ASM_GLOBAL_FUNC( wine_get_es
, "movw %es,%ax\n\tret" )
204 __ASM_GLOBAL_FUNC( wine_get_fs
, "movw %fs,%ax\n\tret" )
205 __ASM_GLOBAL_FUNC( wine_get_gs
, "movw %gs,%ax\n\tret" )
206 __ASM_GLOBAL_FUNC( wine_get_ss
, "movw %ss,%ax\n\tret" )
207 __ASM_GLOBAL_FUNC( wine_set_fs
, "movl 4(%esp),%eax\n\tmovw %ax,%fs\n\tret" )
208 __ASM_GLOBAL_FUNC( wine_set_gs
, "movl 4(%esp),%eax\n\tmovw %ax,%gs\n\tret" )
209 # endif /* defined(_MSC_VER) */
210 #endif /* defined(__i386__) */