462 lines
14 KiB
C
462 lines
14 KiB
C
/*
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* LDT manipulation functions
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*
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* Copyright 1993 Robert J. Amstadt
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* Copyright 1995 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "config.h"
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#include "wine/port.h"
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#include <assert.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include "winbase.h"
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#define WINE_EXPORT_LDT_COPY
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#include "wine/library.h"
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#ifdef __i386__
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#ifdef linux
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#ifdef HAVE_SYS_SYSCALL_H
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# include <sys/syscall.h>
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#endif
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struct modify_ldt_s
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{
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unsigned int entry_number;
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unsigned long base_addr;
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unsigned int limit;
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unsigned int seg_32bit : 1;
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unsigned int contents : 2;
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unsigned int read_exec_only : 1;
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unsigned int limit_in_pages : 1;
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unsigned int seg_not_present : 1;
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unsigned int useable:1;
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};
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static inline void fill_modify_ldt_struct( struct modify_ldt_s *ptr, const LDT_ENTRY *entry )
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{
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ptr->base_addr = (unsigned long)wine_ldt_get_base(entry);
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ptr->limit = entry->LimitLow | (entry->HighWord.Bits.LimitHi << 16);
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ptr->seg_32bit = entry->HighWord.Bits.Default_Big;
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ptr->contents = (entry->HighWord.Bits.Type >> 2) & 3;
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ptr->read_exec_only = !(entry->HighWord.Bits.Type & 2);
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ptr->limit_in_pages = entry->HighWord.Bits.Granularity;
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ptr->seg_not_present = !entry->HighWord.Bits.Pres;
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ptr->useable = entry->HighWord.Bits.Sys;
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}
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static inline int modify_ldt( int func, struct modify_ldt_s *ptr, unsigned long count )
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{
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int res;
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__asm__ __volatile__( "pushl %%ebx\n\t"
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"movl %2,%%ebx\n\t"
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"int $0x80\n\t"
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"popl %%ebx"
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: "=a" (res)
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: "0" (SYS_modify_ldt),
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"r" (func),
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"c" (ptr),
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"d" (count) );
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if (res >= 0) return res;
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errno = -res;
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return -1;
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}
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static inline int set_thread_area( struct modify_ldt_s *ptr )
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{
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int res;
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__asm__ __volatile__( "pushl %%ebx\n\t"
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"movl %2,%%ebx\n\t"
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"int $0x80\n\t"
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"popl %%ebx"
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: "=a" (res)
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: "0" (243) /* SYS_set_thread_area */, "r" (ptr) );
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if (res >= 0) return res;
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errno = -res;
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return -1;
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}
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#endif /* linux */
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#if defined(__svr4__) || defined(_SCO_DS)
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#include <sys/sysi86.h>
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extern int sysi86(int,void*);
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#ifndef __sun__
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#include <sys/seg.h>
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#endif
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#endif
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#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
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#include <machine/segments.h>
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extern int i386_get_ldt(int, union descriptor *, int);
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extern int i386_set_ldt(int, union descriptor *, int);
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#endif /* __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
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#endif /* __i386__ */
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/* local copy of the LDT */
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struct __wine_ldt_copy wine_ldt_copy;
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static const LDT_ENTRY null_entry; /* all-zeros, used to clear LDT entries */
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#define LDT_SIZE 8192
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/* empty function for default locks */
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static void nop(void) { }
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static void (*lock_ldt)(void) = nop;
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static void (*unlock_ldt)(void) = nop;
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static inline int is_gdt_sel( unsigned short sel ) { return !(sel & 4); }
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/***********************************************************************
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* wine_ldt_init_locking
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*
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* Set the LDT locking/unlocking functions.
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*/
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void wine_ldt_init_locking( void (*lock_func)(void), void (*unlock_func)(void) )
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{
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lock_ldt = lock_func;
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unlock_ldt = unlock_func;
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}
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/***********************************************************************
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* wine_ldt_get_entry
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*
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* Retrieve an LDT entry. Return a null entry if selector is not allocated.
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*/
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void wine_ldt_get_entry( unsigned short sel, LDT_ENTRY *entry )
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{
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int index = sel >> 3;
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if (is_gdt_sel(sel))
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{
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*entry = null_entry;
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return;
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}
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lock_ldt();
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if (wine_ldt_copy.flags[index] & WINE_LDT_FLAGS_ALLOCATED)
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{
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wine_ldt_set_base( entry, wine_ldt_copy.base[index] );
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wine_ldt_set_limit( entry, wine_ldt_copy.limit[index] );
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wine_ldt_set_flags( entry, wine_ldt_copy.flags[index] );
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}
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else *entry = null_entry;
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unlock_ldt();
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}
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/***********************************************************************
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* internal_set_entry
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*
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* Set an LDT entry, without locking. For internal use only.
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*/
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static int internal_set_entry( unsigned short sel, const LDT_ENTRY *entry )
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{
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int ret = 0, index = sel >> 3;
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if (index < WINE_LDT_FIRST_ENTRY) return 0; /* cannot modify reserved entries */
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#ifdef __i386__
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#ifdef linux
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{
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struct modify_ldt_s ldt_info;
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ldt_info.entry_number = index;
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fill_modify_ldt_struct( &ldt_info, entry );
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if ((ret = modify_ldt(0x11, &ldt_info, sizeof(ldt_info))) < 0)
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perror( "modify_ldt" );
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}
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#endif /* linux */
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#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
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{
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LDT_ENTRY entry_copy = *entry;
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/* The kernel will only let us set LDTs with user priority level */
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if (entry_copy.HighWord.Bits.Pres
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&& entry_copy.HighWord.Bits.Dpl != 3)
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entry_copy.HighWord.Bits.Dpl = 3;
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ret = i386_set_ldt(index, (union descriptor *)&entry_copy, 1);
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if (ret < 0)
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{
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perror("i386_set_ldt");
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fprintf( stderr, "Did you reconfigure the kernel with \"options USER_LDT\"?\n" );
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exit(1);
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}
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}
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#endif /* __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
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#if defined(__svr4__) || defined(_SCO_DS)
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{
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struct ssd ldt_mod;
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ldt_mod.sel = sel;
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ldt_mod.bo = (unsigned long)wine_ldt_get_base(entry);
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ldt_mod.ls = entry->LimitLow | (entry->HighWord.Bits.LimitHi << 16);
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ldt_mod.acc1 = entry->HighWord.Bytes.Flags1;
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ldt_mod.acc2 = entry->HighWord.Bytes.Flags2 >> 4;
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if ((ret = sysi86(SI86DSCR, &ldt_mod)) == -1) perror("sysi86");
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}
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#endif
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#endif /* __i386__ */
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if (ret >= 0)
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{
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wine_ldt_copy.base[index] = wine_ldt_get_base(entry);
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wine_ldt_copy.limit[index] = wine_ldt_get_limit(entry);
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wine_ldt_copy.flags[index] = (entry->HighWord.Bits.Type |
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(entry->HighWord.Bits.Default_Big ? WINE_LDT_FLAGS_32BIT : 0) |
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(wine_ldt_copy.flags[index] & WINE_LDT_FLAGS_ALLOCATED));
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}
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return ret;
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}
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/***********************************************************************
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* wine_ldt_set_entry
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*
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* Set an LDT entry.
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*/
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int wine_ldt_set_entry( unsigned short sel, const LDT_ENTRY *entry )
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{
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int ret;
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lock_ldt();
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ret = internal_set_entry( sel, entry );
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unlock_ldt();
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return ret;
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}
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/***********************************************************************
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* wine_ldt_get_ptr
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*
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* Convert a segment:offset pair to a linear pointer.
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* Note: we don't lock the LDT since this has to be fast.
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*/
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void *wine_ldt_get_ptr( unsigned short sel, unsigned int offset )
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{
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int index;
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if (is_gdt_sel(sel)) /* GDT selector */
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return (void *)offset;
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if ((index = (sel >> 3)) < WINE_LDT_FIRST_ENTRY) /* system selector */
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return (void *)offset;
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if (!(wine_ldt_copy.flags[index] & WINE_LDT_FLAGS_32BIT)) offset &= 0xffff;
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return (char *)wine_ldt_copy.base[index] + offset;
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}
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/***********************************************************************
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* wine_ldt_alloc_entries
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*
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* Allocate a number of consecutive ldt entries, without setting the LDT contents.
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* Return a selector for the first entry.
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*/
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unsigned short wine_ldt_alloc_entries( int count )
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{
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int i, index, size = 0;
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if (count <= 0) return 0;
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lock_ldt();
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for (i = WINE_LDT_FIRST_ENTRY; i < LDT_SIZE; i++)
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{
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if (wine_ldt_copy.flags[i] & WINE_LDT_FLAGS_ALLOCATED) size = 0;
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else if (++size >= count) /* found a large enough block */
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{
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index = i - size + 1;
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/* mark selectors as allocated */
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for (i = 0; i < count; i++) wine_ldt_copy.flags[index + i] |= WINE_LDT_FLAGS_ALLOCATED;
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unlock_ldt();
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return (index << 3) | 7;
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}
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}
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unlock_ldt();
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return 0;
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}
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/***********************************************************************
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* wine_ldt_realloc_entries
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*
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* Reallocate a number of consecutive ldt entries, without changing the LDT contents.
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* Return a selector for the first entry.
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*/
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unsigned short wine_ldt_realloc_entries( unsigned short sel, int oldcount, int newcount )
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{
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int i;
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if (oldcount < newcount) /* we need to add selectors */
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{
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int index = sel >> 3;
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lock_ldt();
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/* check if the next selectors are free */
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if (index + newcount > LDT_SIZE) i = oldcount;
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else
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for (i = oldcount; i < newcount; i++)
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if (wine_ldt_copy.flags[index+i] & WINE_LDT_FLAGS_ALLOCATED) break;
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if (i < newcount) /* they are not free */
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{
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wine_ldt_free_entries( sel, oldcount );
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sel = wine_ldt_alloc_entries( newcount );
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}
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else /* mark the selectors as allocated */
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{
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for (i = oldcount; i < newcount; i++)
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wine_ldt_copy.flags[index+i] |= WINE_LDT_FLAGS_ALLOCATED;
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}
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unlock_ldt();
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}
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else if (oldcount > newcount) /* we need to remove selectors */
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{
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wine_ldt_free_entries( sel + (newcount << 3), newcount - oldcount );
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}
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return sel;
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}
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/***********************************************************************
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* wine_ldt_free_entries
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*
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* Free a number of consecutive ldt entries and clear their contents.
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*/
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void wine_ldt_free_entries( unsigned short sel, int count )
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{
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int index;
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lock_ldt();
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for (index = sel >> 3; count > 0; count--, index++)
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{
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internal_set_entry( sel, &null_entry );
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wine_ldt_copy.flags[index] = 0;
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}
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unlock_ldt();
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}
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#ifdef __i386__
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static int fs_gdt_index = -1; /* GDT index for %fs, or 0 if GDT not supported on this kernel */
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/***********************************************************************
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* wine_ldt_alloc_fs
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*
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* Allocate an LDT entry for a %fs selector, reusing a global
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* GDT selector if possible. Return the selector value.
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*/
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unsigned short wine_ldt_alloc_fs(void)
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{
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if (fs_gdt_index == -1)
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{
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#ifdef __linux__
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struct modify_ldt_s ldt_info;
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int ret;
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ldt_info.entry_number = -1;
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fill_modify_ldt_struct( &ldt_info, &null_entry );
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if ((ret = set_thread_area( &ldt_info ) < 0))
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{
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fs_gdt_index = 0; /* don't try it again */
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if (errno != ENOSYS) perror( "set_thread_area" );
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}
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else fs_gdt_index = ldt_info.entry_number;
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#endif /* __linux__ */
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}
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if (fs_gdt_index > 0) return (fs_gdt_index << 3) | 3;
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return wine_ldt_alloc_entries( 1 );
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}
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/***********************************************************************
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* wine_ldt_init_fs
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*
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* Initialize the entry for the %fs selector of the current thread, and
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* set the thread %fs register.
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*
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* Note: this runs in the context of the new thread, so cannot acquire locks.
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*/
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void wine_ldt_init_fs( unsigned short sel, const LDT_ENTRY *entry )
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{
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if (is_gdt_sel(sel))
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{
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#ifdef __linux__
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struct modify_ldt_s ldt_info;
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int ret;
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ldt_info.entry_number = sel >> 3;
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assert( ldt_info.entry_number == fs_gdt_index );
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fill_modify_ldt_struct( &ldt_info, entry );
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if ((ret = set_thread_area( &ldt_info ) < 0)) perror( "set_thread_area" );
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#endif /* __linux__ */
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}
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else /* LDT selector */
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{
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internal_set_entry( sel, entry );
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}
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wine_set_fs( sel );
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}
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/***********************************************************************
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* wine_ldt_free_fs
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*
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* Free a %fs selector returned by wine_ldt_alloc_fs.
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*/
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void wine_ldt_free_fs( unsigned short sel )
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{
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if (is_gdt_sel(sel)) return; /* nothing to do */
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if (!((wine_get_fs() ^ sel) & ~3))
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{
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/* FIXME: if freeing current %fs we cannot acquire locks */
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wine_set_fs( 0 );
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internal_set_entry( sel, &null_entry );
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wine_ldt_copy.flags[sel >> 3] = 0;
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}
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else wine_ldt_free_entries( sel, 1 );
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}
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/***********************************************************************
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* selector access functions
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*/
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# ifndef _MSC_VER
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/* Nothing needs to be done for MS C, it will do with inline versions from the winnt.h */
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__ASM_GLOBAL_FUNC( wine_get_cs, "movw %cs,%ax\n\tret" )
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__ASM_GLOBAL_FUNC( wine_get_ds, "movw %ds,%ax\n\tret" )
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__ASM_GLOBAL_FUNC( wine_get_es, "movw %es,%ax\n\tret" )
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__ASM_GLOBAL_FUNC( wine_get_fs, "movw %fs,%ax\n\tret" )
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__ASM_GLOBAL_FUNC( wine_get_gs, "movw %gs,%ax\n\tret" )
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__ASM_GLOBAL_FUNC( wine_get_ss, "movw %ss,%ax\n\tret" )
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__ASM_GLOBAL_FUNC( wine_set_fs, "movl 4(%esp),%eax\n\tmovw %ax,%fs\n\tret" )
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__ASM_GLOBAL_FUNC( wine_set_gs, "movl 4(%esp),%eax\n\tmovw %ax,%gs\n\tret" )
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# endif /* defined(_MSC_VER) */
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#endif /* __i386__ */
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