diff options
Diffstat (limited to 'src/libw32dll/wine/ldt_keeper.c')
| -rw-r--r-- | src/libw32dll/wine/ldt_keeper.c | 119 |
1 files changed, 88 insertions, 31 deletions
diff --git a/src/libw32dll/wine/ldt_keeper.c b/src/libw32dll/wine/ldt_keeper.c index 273bccc2e..fedf0033b 100644 --- a/src/libw32dll/wine/ldt_keeper.c +++ b/src/libw32dll/wine/ldt_keeper.c @@ -1,4 +1,46 @@ +/* + * Copyright (C) 2000-2001 the xine project + * + * This file is part of xine, a unix video player. + * + * xine is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * xine is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA + * + * $Id: ldt_keeper.c,v 1.3 2001/11/08 21:39:04 miguelfreitas Exp $ + * + * + * contents: + * + * Allocate an LDT entry for the TEB (thread environment block) + * TEB is a the only thread specific structure provided to userspace + * by MS Windows. + * Any W32 dll may access the TEB through FS:0, so we must provide it. + * + * Additional notes: + * aviplay used to use the same LDT/TEB/FS to all his threads and did it + * by calling these functions before any threads have been created. this + * is a ugly hack, as the main code includes a plugin function at its + * initialization. + * Also, IMHO, that was slightly wrong. The TEB is supposed to be unique + * per W32 thread. The current xine implementation will allocate different + * TEBs for the audio and video codecs. + * + */ + + /** + * OLD AVIFILE COMMENT: * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! * This file MUST be in main library because LDT must * be modified before program creates first thread @@ -7,6 +49,9 @@ */ #include "ldt_keeper.h" +/* +#include "winnt.h" +*/ #include <string.h> #include <stdlib.h> @@ -19,6 +64,8 @@ #ifdef __linux__ #include <asm/unistd.h> #include <asm/ldt.h> +/* prototype it here, so we won't depend on kernel headers */ +int modify_ldt(int func, void *ptr, unsigned long bytecount); #else #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__) #include <machine/sysarch.h> @@ -41,7 +88,7 @@ extern int sysi86(int, void*); #define NUMSYSLDTS 6 /* Let's hope the SunOS 5.8 value is OK */ #endif -#define TEB_SEL_IDX NUMSYSLDTS +#define TEB_SEL_IDX NUMSYSLDTS #endif #define LDT_ENTRIES 8192 @@ -68,9 +115,11 @@ struct modify_ldt_ldt_s { /* user level (privilege level: 3) ldt (1<<2) segment selector */ #define LDT_SEL(idx) ((idx) << 3 | 1 << 2 | 3) +/* i got this value from wine sources, it's the first free LDT entry */ #ifndef TEB_SEL_IDX -#define TEB_SEL_IDX 1 +#define TEB_SEL_IDX 17 #endif + #define TEB_SEL LDT_SEL(TEB_SEL_IDX) /** @@ -80,8 +129,7 @@ struct modify_ldt_ldt_s { * */ -static void* fs_seg = NULL; -static char* prev_struct = NULL; + /** * here is a small logical problem with Restore for multithreaded programs - * in C++ we use static class for this... @@ -90,18 +138,22 @@ static char* prev_struct = NULL; #ifdef __cplusplus extern "C" #endif + + void Setup_FS_Segment(void) { -/* __asm__ __volatile__( "movl %0,%%eax; movw %%ax, %%fs" : : "i" (TEB_SEL) ); -*/ } +/* (just in case someday we need dynamic entry indexes) +__ASM_GLOBAL_FUNC( __set_fs, "movl 4(%esp),%eax\n\tmovw %ax,%fs\n\tret" ) +*/ + +/* we don't need this - use modify_ldt instead */ +#if 0 #ifdef __linux__ -/* XXX: why is this routine from libc redefined here? */ -/* NOTE: the redefined version ignores the count param, count is hardcoded as 16 */ static int LDT_Modify( int func, struct modify_ldt_ldt_s *ptr, unsigned long count ) { @@ -131,6 +183,7 @@ static int LDT_Modify( int func, struct modify_ldt_ldt_s *ptr, return -1; } #endif +#endif #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__) static void LDT_EntryToBytes( unsigned long *buffer, const struct modify_ldt_ldt_s *content ) @@ -148,25 +201,23 @@ static void LDT_EntryToBytes( unsigned long *buffer, const struct modify_ldt_ldt } #endif -void Setup_LDT_Keeper(void) +LDT_FS * Setup_LDT_Keeper(void) { struct modify_ldt_ldt_s array; - int fd; int ret; - - if (fs_seg) - return; - - prev_struct = 0; - fd = open("/dev/zero", O_RDWR); - fs_seg = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE, MAP_PRIVATE, - fd, 0); - if(fs_seg==(void*)-1) + LDT_FS *ldt_fs; + + ldt_fs = malloc( sizeof( LDT_FS ) ); + + ldt_fs->fd = open("/dev/zero", O_RDWR); + ldt_fs->fs_seg = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE, MAP_PRIVATE, + ldt_fs->fd, 0); + if(ldt_fs->fs_seg==(void*)-1) { perror("ERROR: Couldn't allocate memory for fs segment"); - return; + return NULL; } - array.base_addr=(int)fs_seg; + array.base_addr=(int)ldt_fs->fs_seg; array.entry_number=TEB_SEL_IDX; array.limit=array.base_addr+getpagesize()-1; array.seg_32bit=1; @@ -175,7 +226,7 @@ void Setup_LDT_Keeper(void) array.contents=MODIFY_LDT_CONTENTS_DATA; array.limit_in_pages=0; #ifdef __linux__ - ret=LDT_Modify(0x1, &array, sizeof(struct modify_ldt_ldt_s)); + ret=modify_ldt(0x1, &array, sizeof(struct modify_ldt_ldt_s)); if(ret<0) { perror("install_fs"); @@ -218,17 +269,23 @@ void Setup_LDT_Keeper(void) Setup_FS_Segment(); - prev_struct = (char*)malloc(sizeof(char) * 8); - *(void**)array.base_addr = prev_struct; - close(fd); + ldt_fs->prev_struct = (char*)malloc(sizeof(char) * 8); + *(void**)array.base_addr = ldt_fs->prev_struct; + + return ldt_fs; } -void Restore_LDT_Keeper(void) +void Restore_LDT_Keeper(LDT_FS *ldt_fs) { - if (fs_seg == 0) + if (ldt_fs == NULL) + return; + if (ldt_fs->fs_seg == 0) return; - if (prev_struct) - free(prev_struct); - munmap((char*)fs_seg, getpagesize()); - fs_seg = 0; + if (ldt_fs->prev_struct) + free(ldt_fs->prev_struct); + munmap((char*)ldt_fs->fs_seg, getpagesize()); + + close(ldt_fs->fd); + + free( ldt_fs ); } |