529 lines
16 KiB
C
529 lines
16 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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 <stdarg.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 "windef.h"
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#include "winbase.h"
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#include "wine/asm.h"
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#ifdef __i386__
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#ifdef __ASM_OBSOLETE
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/* the local copy of the LDT */
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struct __wine_ldt_copy
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{
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void *base[8192]; /* base address or 0 if entry is free */
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unsigned long limit[8192]; /* limit in bytes or 0 if entry is free */
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unsigned char flags[8192]; /* flags (defined below) */
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} wine_ldt_copy_obsolete = { { 0, 0, 0 } };
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#define WINE_LDT_FLAGS_32BIT 0x40 /* Segment is 32-bit (code or stack) */
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#define WINE_LDT_FLAGS_ALLOCATED 0x80 /* Segment is allocated (no longer free) */
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static inline void *wine_ldt_get_base( const LDT_ENTRY *ent )
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{
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return (void *)(ent->BaseLow |
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(ULONG_PTR)ent->HighWord.Bits.BaseMid << 16 |
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(ULONG_PTR)ent->HighWord.Bits.BaseHi << 24);
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}
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static inline unsigned int wine_ldt_get_limit( const LDT_ENTRY *ent )
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{
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unsigned int limit = ent->LimitLow | (ent->HighWord.Bits.LimitHi << 16);
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if (ent->HighWord.Bits.Granularity) limit = (limit << 12) | 0xfff;
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return limit;
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}
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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 usable : 1;
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unsigned int garbage : 25;
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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->usable = entry->HighWord.Bits.Sys;
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ptr->garbage = 0;
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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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return syscall( 123 /* SYS_modify_ldt */, func, ptr, count );
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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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return syscall( 243 /* SYS_set_thread_area */, ptr );
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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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#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(__FreeBSD_kernel__) || defined(__OpenBSD__) || defined(__DragonFly__)
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#include <machine/segments.h>
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#include <machine/sysarch.h>
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#endif /* __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
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#ifdef __GNU__
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#include <mach/i386/mach_i386.h>
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#include <mach/mach_traps.h>
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#endif
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#ifdef __APPLE__
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#include <i386/user_ldt.h>
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#endif
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static const LDT_ENTRY null_entry; /* all-zeros, used to clear LDT entries */
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#define LDT_FIRST_ENTRY 512
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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_obsolete( 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_obsolete( 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_obsolete.flags[index] & WINE_LDT_FLAGS_ALLOCATED)
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{
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ULONG_PTR base = (ULONG_PTR)wine_ldt_copy_obsolete.base[index];
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ULONG limit = wine_ldt_copy_obsolete.limit[index];
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entry->BaseLow = (WORD)base;
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entry->HighWord.Bits.BaseMid = (BYTE)(base >> 16);
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entry->HighWord.Bits.BaseHi = (BYTE)(base >> 24);
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if ((entry->HighWord.Bits.Granularity = (limit >= 0x100000))) limit >>= 12;
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entry->LimitLow = (WORD)limit;
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entry->HighWord.Bits.LimitHi = (limit >> 16);
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entry->HighWord.Bits.Dpl = 3;
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entry->HighWord.Bits.Pres = 1;
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entry->HighWord.Bits.Type = wine_ldt_copy_obsolete.flags[index];
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entry->HighWord.Bits.Sys = 0;
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entry->HighWord.Bits.Reserved_0 = 0;
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entry->HighWord.Bits.Default_Big = !!(wine_ldt_copy_obsolete.flags[index] & WINE_LDT_FLAGS_32BIT);
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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 < LDT_FIRST_ENTRY) return 0; /* cannot modify reserved entries */
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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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#elif defined(__NetBSD__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__) || defined(__DragonFly__)
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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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#elif 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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#elif defined(__APPLE__)
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if ((ret = i386_set_ldt(index, (union ldt_entry *)entry, 1)) < 0)
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perror("i386_set_ldt");
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#elif defined(__GNU__)
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if ((ret = i386_set_ldt(mach_thread_self(), sel, (descriptor_list_t)entry, 1)) != KERN_SUCCESS)
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perror("i386_set_ldt");
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#else
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fprintf( stderr, "No LDT support on this platform\n" );
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exit(1);
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#endif
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if (ret >= 0)
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{
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wine_ldt_copy_obsolete.base[index] = wine_ldt_get_base(entry);
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wine_ldt_copy_obsolete.limit[index] = wine_ldt_get_limit(entry);
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wine_ldt_copy_obsolete.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_obsolete.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_obsolete( 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_is_system
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*
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* Check if the selector is a system selector (i.e. not managed by Wine).
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*/
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int wine_ldt_is_system_obsolete( unsigned short sel )
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{
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return is_gdt_sel(sel) || ((sel >> 3) < LDT_FIRST_ENTRY);
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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_obsolete( unsigned short sel, unsigned long 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)) < LDT_FIRST_ENTRY) /* system selector */
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return (void *)offset;
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if (!(wine_ldt_copy_obsolete.flags[index] & WINE_LDT_FLAGS_32BIT)) offset &= 0xffff;
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return (char *)wine_ldt_copy_obsolete.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_obsolete( 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 = LDT_FIRST_ENTRY; i < LDT_SIZE; i++)
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{
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if (wine_ldt_copy_obsolete.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_obsolete.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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void wine_ldt_free_entries_obsolete( unsigned short sel, int count );
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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_obsolete( 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_obsolete.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_obsolete( sel, oldcount );
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sel = wine_ldt_alloc_entries_obsolete( 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_obsolete.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_obsolete( 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_obsolete( 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_obsolete.flags[index] = 0;
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}
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unlock_ldt();
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}
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static int global_fs_sel = -1; /* global selector for %fs shared among all threads */
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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_obsolete(void)
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{
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if (global_fs_sel == -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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/* the preloader may have allocated it already */
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__asm__( "mov %%fs,%0" : "=r" (global_fs_sel) );
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if (global_fs_sel && is_gdt_sel(global_fs_sel)) return global_fs_sel;
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memset( &ldt_info, 0, sizeof(ldt_info) );
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ldt_info.entry_number = -1;
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ldt_info.seg_32bit = 1;
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ldt_info.usable = 1;
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if ((ret = set_thread_area( &ldt_info ) < 0))
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{
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global_fs_sel = 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 global_fs_sel = (ldt_info.entry_number << 3) | 3;
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#elif defined(__FreeBSD__) || defined (__FreeBSD_kernel__)
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global_fs_sel = GSEL( GUFS_SEL, SEL_UPL );
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#endif
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}
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if (global_fs_sel > 0) return global_fs_sel;
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return wine_ldt_alloc_entries_obsolete( 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_obsolete( unsigned short sel, const LDT_ENTRY *entry )
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{
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if ((sel & ~3) == (global_fs_sel & ~3))
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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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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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#elif defined(__FreeBSD__) || defined (__FreeBSD_kernel__) || defined(__DragonFly__)
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i386_set_fsbase( wine_ldt_get_base( entry ));
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#endif
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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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__asm__( "mov %0,%%fs" :: "r" (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_obsolete( unsigned short sel )
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{
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WORD fs;
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if (is_gdt_sel(sel)) return; /* nothing to do */
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__asm__( "mov %%fs,%0" : "=r" (fs) );
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if (!((fs ^ sel) & ~3))
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{
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/* FIXME: if freeing current %fs we cannot acquire locks */
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__asm__( "mov %0,%%fs" :: "r" (0) );
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internal_set_entry( sel, &null_entry );
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wine_ldt_copy_obsolete.flags[sel >> 3] = 0;
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}
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else wine_ldt_free_entries_obsolete( 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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__ASM_GLOBAL_FUNC( wine_get_cs_obsolete, "movw %cs,%ax\n\tret" )
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__ASM_GLOBAL_FUNC( wine_get_ds_obsolete, "movw %ds,%ax\n\tret" )
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__ASM_GLOBAL_FUNC( wine_get_es_obsolete, "movw %es,%ax\n\tret" )
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__ASM_GLOBAL_FUNC( wine_get_fs_obsolete, "movw %fs,%ax\n\tret" )
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__ASM_GLOBAL_FUNC( wine_get_gs_obsolete, "movw %gs,%ax\n\tret" )
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__ASM_GLOBAL_FUNC( wine_get_ss_obsolete, "movw %ss,%ax\n\tret" )
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__ASM_GLOBAL_FUNC( wine_set_fs_obsolete, "movl 4(%esp),%eax\n\tmovw %ax,%fs\n\tret" )
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__ASM_GLOBAL_FUNC( wine_set_gs_obsolete, "movl 4(%esp),%eax\n\tmovw %ax,%gs\n\tret" )
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__ASM_OBSOLETE(wine_ldt_alloc_entries);
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__ASM_OBSOLETE(wine_ldt_alloc_fs);
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__ASM_OBSOLETE(wine_ldt_copy);
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__ASM_OBSOLETE(wine_ldt_free_entries);
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__ASM_OBSOLETE(wine_ldt_free_fs);
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__ASM_OBSOLETE(wine_ldt_get_entry);
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__ASM_OBSOLETE(wine_ldt_get_ptr);
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__ASM_OBSOLETE(wine_ldt_init_fs);
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__ASM_OBSOLETE(wine_ldt_init_locking);
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__ASM_OBSOLETE(wine_ldt_is_system);
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__ASM_OBSOLETE(wine_ldt_realloc_entries);
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__ASM_OBSOLETE(wine_ldt_set_entry);
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__ASM_OBSOLETE(wine_get_cs);
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__ASM_OBSOLETE(wine_get_ds);
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__ASM_OBSOLETE(wine_get_es);
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__ASM_OBSOLETE(wine_get_fs);
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__ASM_OBSOLETE(wine_get_gs);
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__ASM_OBSOLETE(wine_get_ss);
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__ASM_OBSOLETE(wine_set_fs);
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__ASM_OBSOLETE(wine_set_gs);
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#endif /* __ASM_OBSOLETE */
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#endif /* __i386__ */
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