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 #include "wine/library.h"
37 #ifdef HAVE_SYS_SYSCALL_H
38 # include <sys/syscall.h>
43 unsigned int entry_number;
44 unsigned long base_addr;
46 unsigned int seg_32bit : 1;
47 unsigned int contents : 2;
48 unsigned int read_exec_only : 1;
49 unsigned int limit_in_pages : 1;
50 unsigned int seg_not_present : 1;
53 static inline int modify_ldt( int func, struct modify_ldt_s *ptr,
58 __asm__ __volatile__( "pushl %%ebx\n\t"
63 : "0" (SYS_modify_ldt),
68 __asm__ __volatile__("int $0x80"
70 : "0" (SYS_modify_ldt),
75 if (res >= 0) return res;
82 #if defined(__svr4__) || defined(_SCO_DS)
83 #include <sys/sysi86.h>
84 extern int sysi86(int,void*);
90 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
91 #include <machine/segments.h>
93 extern int i386_get_ldt(int, union descriptor *, int);
94 extern int i386_set_ldt(int, union descriptor *, int);
95 #endif /* __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
99 /* local copy of the LDT */
100 struct __wine_ldt_copy wine_ldt_copy;
103 /***********************************************************************
106 * Retrieve an LDT entry.
108 void wine_ldt_get_entry( unsigned short sel, LDT_ENTRY *entry )
110 int index = sel >> 3;
111 wine_ldt_set_base( entry, wine_ldt_copy.base[index] );
112 wine_ldt_set_limit( entry, wine_ldt_copy.limit[index] );
113 wine_ldt_set_flags( entry, wine_ldt_copy.flags[index] );
117 /***********************************************************************
122 int wine_ldt_set_entry( unsigned short sel, const LDT_ENTRY *entry )
124 int ret = 0, index = sel >> 3;
126 /* Entry 0 must not be modified; its base and limit are always 0 */
127 if (!index) return 0;
133 struct modify_ldt_s ldt_info;
135 ldt_info.entry_number = index;
136 ldt_info.base_addr = (unsigned long)wine_ldt_get_base(entry);
137 ldt_info.limit = entry->LimitLow | (entry->HighWord.Bits.LimitHi << 16);
138 ldt_info.seg_32bit = entry->HighWord.Bits.Default_Big;
139 ldt_info.contents = (entry->HighWord.Bits.Type >> 2) & 3;
140 ldt_info.read_exec_only = !(entry->HighWord.Bits.Type & 2);
141 ldt_info.limit_in_pages = entry->HighWord.Bits.Granularity;
142 ldt_info.seg_not_present = !entry->HighWord.Bits.Pres;
144 if ((ret = modify_ldt(1, &ldt_info, sizeof(ldt_info))) < 0)
145 perror( "modify_ldt" );
149 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
151 LDT_ENTRY entry_copy = *entry;
152 /* The kernel will only let us set LDTs with user priority level */
153 if (entry_copy.HighWord.Bits.Pres
154 && entry_copy.HighWord.Bits.Dpl != 3)
155 entry_copy.HighWord.Bits.Dpl = 3;
156 ret = i386_set_ldt(index, (union descriptor *)&entry_copy, 1);
159 perror("i386_set_ldt");
160 fprintf( stderr, "Did you reconfigure the kernel with \"options USER_LDT\"?\n" );
164 #endif /* __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
166 #if defined(__svr4__) || defined(_SCO_DS)
170 ldt_mod.bo = (unsigned long)wine_ldt_get_base(entry);
171 ldt_mod.ls = entry->LimitLow | (entry->HighWord.Bits.LimitHi << 16);
172 ldt_mod.acc1 = entry->HighWord.Bytes.Flags1;
173 ldt_mod.acc2 = entry->HighWord.Bytes.Flags2 >> 4;
174 if ((ret = sysi86(SI86DSCR, &ldt_mod)) == -1) perror("sysi86");
178 #endif /* __i386__ */
182 wine_ldt_copy.base[index] = wine_ldt_get_base(entry);
183 wine_ldt_copy.limit[index] = wine_ldt_get_limit(entry);
184 wine_ldt_copy.flags[index] = (entry->HighWord.Bits.Type |
185 (entry->HighWord.Bits.Default_Big ? WINE_LDT_FLAGS_32BIT : 0) |
186 (wine_ldt_copy.flags[index] & WINE_LDT_FLAGS_ALLOCATED));
192 /***********************************************************************
193 * selector access functions
197 /* Nothing needs to be done for MS C, it will do with inline versions from the winnt.h */
198 __ASM_GLOBAL_FUNC( wine_get_cs, "movw %cs,%ax\n\tret" )
199 __ASM_GLOBAL_FUNC( wine_get_ds, "movw %ds,%ax\n\tret" )
200 __ASM_GLOBAL_FUNC( wine_get_es, "movw %es,%ax\n\tret" )
201 __ASM_GLOBAL_FUNC( wine_get_fs, "movw %fs,%ax\n\tret" )
202 __ASM_GLOBAL_FUNC( wine_get_gs, "movw %gs,%ax\n\tret" )
203 __ASM_GLOBAL_FUNC( wine_get_ss, "movw %ss,%ax\n\tret" )
204 __ASM_GLOBAL_FUNC( wine_set_fs, "movl 4(%esp),%eax\n\tmovw %ax,%fs\n\tret" )
205 __ASM_GLOBAL_FUNC( wine_set_gs, "movl 4(%esp),%eax\n\tmovw %ax,%gs\n\tret" )
206 # endif /* defined(_MSC_VER) */
207 #endif /* defined(__i386__) */