summaryrefslogtreecommitdiffstats
path: root/loader/ldt_keeper.c
diff options
context:
space:
mode:
Diffstat (limited to 'loader/ldt_keeper.c')
-rw-r--r--loader/ldt_keeper.c275
1 files changed, 0 insertions, 275 deletions
diff --git a/loader/ldt_keeper.c b/loader/ldt_keeper.c
deleted file mode 100644
index a5ae1d6b9a..0000000000
--- a/loader/ldt_keeper.c
+++ /dev/null
@@ -1,275 +0,0 @@
-/**
- * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
- * This file MUST be in main library because LDT must
- * be modified before program creates first thread
- * - avifile includes this file from C++ code
- * and initializes it at the start of player!
- * it might sound like a hack and it really is - but
- * as aviplay is deconding video with more than just one
- * thread currently it's necessary to do it this way
- * this might change in the future
- */
-
-/* applied some modification to make make our xine friend more happy */
-
-/*
- * Modified for use with MPlayer, detailed changelog at
- * http://svn.mplayerhq.hu/mplayer/trunk/
- */
-
-#include "config.h"
-#include "ldt_keeper.h"
-
-#include <string.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <fcntl.h>
-#ifdef HAVE_SYS_MMAN_H
-#include <sys/mman.h>
-#else
-#include "osdep/mmap.h"
-#endif
-#include <sys/types.h>
-#include <stdio.h>
-#include <unistd.h>
-#include "osdep/mmap_anon.h"
-#include "mp_msg.h"
-#ifdef __linux__
-#include <asm/unistd.h>
-#include <asm/ldt.h>
-// 2.5.xx+ calls this user_desc:
-#include <linux/version.h>
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,47)
-#define modify_ldt_ldt_s user_desc
-#endif
-/// declare modify_ldt with the _syscall3 macro for older glibcs
-#if defined(__GLIBC__) && (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ == 0))
-_syscall3( int, modify_ldt, int, func, void *, ptr, unsigned long, bytecount );
-#else
-int modify_ldt(int func, void *ptr, unsigned long bytecount);
-#endif
-#else
-#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
-#include <machine/segments.h>
-#include <machine/sysarch.h>
-#elif defined(__APPLE__)
-#include <architecture/i386/table.h>
-#include <i386/user_ldt.h>
-#elif defined(__svr4__)
-#include <sys/segment.h>
-#include <sys/sysi86.h>
-
-/* solaris x86: add missing prototype for sysi86(), but only when sysi86(int, void*) is known to be valid */
-#ifdef HAVE_SYSI86_iv
-int sysi86(int, void*);
-#endif
-
-#ifndef NUMSYSLDTS /* SunOS 2.5.1 does not define NUMSYSLDTS */
-#define NUMSYSLDTS 6 /* Let's hope the SunOS 5.8 value is OK */
-#endif
-
-#define TEB_SEL_IDX NUMSYSLDTS
-#endif
-
-#define LDT_ENTRIES 8192
-#define LDT_ENTRY_SIZE 8
-#pragma pack(4)
-struct modify_ldt_ldt_s {
- unsigned int entry_number;
- unsigned long base_addr;
- unsigned int limit;
- unsigned int seg_32bit:1;
- unsigned int contents:2;
- unsigned int read_exec_only:1;
- unsigned int limit_in_pages:1;
- unsigned int seg_not_present:1;
- unsigned int useable:1;
-};
-
-#define MODIFY_LDT_CONTENTS_DATA 0
-#define MODIFY_LDT_CONTENTS_STACK 1
-#define MODIFY_LDT_CONTENTS_CODE 2
-#endif
-
-
-/* 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 */
-#if (defined(__APPLE__) || defined(__FreeBSD__)) && defined(LDT_AUTO_ALLOC)
-#define TEB_SEL_IDX LDT_AUTO_ALLOC
-#define USE_LDT_AA
-#endif
-
-#ifndef TEB_SEL_IDX
-#define TEB_SEL_IDX 17
-#endif
-
-static unsigned int fs_ldt = TEB_SEL_IDX;
-
-
-/**
- * here is a small logical problem with Restore for multithreaded programs -
- * in C++ we use static class for this...
- */
-
-void Setup_FS_Segment(void)
-{
- unsigned int ldt_desc = LDT_SEL(fs_ldt);
-
- __asm__ volatile(
- "movl %0,%%eax; movw %%ax, %%fs" : : "r" (ldt_desc)
- :"eax"
- );
-}
-
-/* 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 )
-{
- int res;
-#ifdef __PIC__
- __asm__ volatile( "pushl %%ebx\n\t"
- "movl %2,%%ebx\n\t"
- "int $0x80\n\t"
- "popl %%ebx"
- : "=a" (res)
- : "0" (__NR_modify_ldt),
- "r" (func),
- "c" (ptr),
- "d"(16)//sizeof(*ptr) from kernel point of view
- :"esi" );
-#else
- __asm__ volatile("int $0x80"
- : "=a" (res)
- : "0" (__NR_modify_ldt),
- "b" (func),
- "c" (ptr),
- "d"(16)
- :"esi");
-#endif /* __PIC__ */
- if (res >= 0) return res;
- errno = -res;
- return -1;
-}
-#endif
-#endif
-
-#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) || defined(__APPLE__)
-static void LDT_EntryToBytes( unsigned long *buffer, const struct modify_ldt_ldt_s *content )
-{
- *buffer++ = ((content->base_addr & 0x0000ffff) << 16) |
- (content->limit & 0x0ffff);
- *buffer = (content->base_addr & 0xff000000) |
- ((content->base_addr & 0x00ff0000)>>16) |
- (content->limit & 0xf0000) |
- (content->contents << 10) |
- ((content->read_exec_only == 0) << 9) |
- ((content->seg_32bit != 0) << 22) |
- ((content->limit_in_pages != 0) << 23) |
- 0xf000;
-}
-#endif
-
-void* fs_seg=0;
-
-ldt_fs_t* Setup_LDT_Keeper(void)
-{
- struct modify_ldt_ldt_s array;
- int ret;
- ldt_fs_t* ldt_fs = malloc(sizeof(ldt_fs_t));
-
- if (!ldt_fs)
- return NULL;
-
-#ifdef __APPLE__
- if (getenv("DYLD_BIND_AT_LAUNCH") == NULL)
- mp_tmsg(MSGT_LOADER, MSGL_WARN, "WARNING: Attempting to use DLL codecs but environment variable\n DYLD_BIND_AT_LAUNCH not set. This will likely crash.\n");
-#endif /* __APPLE__ */
-
- fs_seg=
- ldt_fs->fs_seg = mmap_anon(NULL, getpagesize(), PROT_READ | PROT_WRITE, MAP_PRIVATE, 0);
- if (ldt_fs->fs_seg == (void*)-1)
- {
- perror("ERROR: Couldn't allocate memory for fs segment");
- free(ldt_fs);
- return NULL;
- }
- *(void**)((char*)ldt_fs->fs_seg+0x18) = ldt_fs->fs_seg;
- memset(&array, 0, sizeof(array));
- 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;
- array.read_exec_only=0;
- array.seg_not_present=0;
- 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");
- printf("Couldn't install fs segment, expect segfault\n");
- }
-#elif defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) || defined(__APPLE__)
- {
- unsigned long d[2];
-
- LDT_EntryToBytes( d, &array );
-#ifdef USE_LDT_AA
- ret = i386_set_ldt(LDT_AUTO_ALLOC, (union descriptor *)d, 1);
- array.entry_number = ret;
- fs_ldt = ret;
-#else
- ret = i386_set_ldt(array.entry_number, (union descriptor *)d, 1);
-#endif
- if (ret < 0)
- {
- perror("install_fs");
- printf("Couldn't install fs segment, expect segfault\n");
- printf("Did you reconfigure the kernel with \"options USER_LDT\"?\n");
-#ifdef __OpenBSD__
- printf("On newer OpenBSD systems did you set machdep.userldt to 1?\n");
-#endif
- }
- }
-#elif defined(__svr4__)
- {
- struct ssd ssd;
- ssd.sel = LDT_SEL(TEB_SEL_IDX);
- ssd.bo = array.base_addr;
- ssd.ls = array.limit - array.base_addr;
- ssd.acc1 = ((array.read_exec_only == 0) << 1) |
- (array.contents << 2) |
- 0xf0; /* P(resent) | DPL3 | S */
- ssd.acc2 = 0x4; /* byte limit, 32-bit segment */
- if (sysi86(SI86DSCR, &ssd) < 0) {
- perror("sysi86(SI86DSCR)");
- printf("Couldn't install fs segment, expect segfault\n");
- }
- }
-#endif
-
- Setup_FS_Segment();
-
- ldt_fs->prev_struct = malloc(8);
- *(void**)array.base_addr = ldt_fs->prev_struct;
-
- return ldt_fs;
-}
-
-void Restore_LDT_Keeper(ldt_fs_t* ldt_fs)
-{
- if (ldt_fs == NULL || ldt_fs->fs_seg == 0)
- return;
- free(ldt_fs->prev_struct);
- munmap((char*)ldt_fs->fs_seg, getpagesize());
- ldt_fs->fs_seg = 0;
- free(ldt_fs);
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-01 15:01:47 +0000