arch/mips/kernel/irixioctl.c

   1 /*
   2  * irixioctl.c: A fucking mess...
   3  *
   4  * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/sched.h>
   9 #include <linux/fs.h>
  10 #include <linux/mm.h>
  11 #include <linux/smp.h>
  12 #include <linux/sockios.h>
  13 #include <linux/syscalls.h>
  14 #include <linux/tty.h>
  15 #include <linux/file.h>
  16 #include <linux/rcupdate.h>
  17
  18 #include <asm/uaccess.h>
  19 #include <asm/ioctl.h>
  20 #include <asm/ioctls.h>
  21
  22 #undef DEBUG_IOCTLS
  23 #undef DEBUG_MISSING_IOCTL
  24
  25 struct irix_termios {
  26         tcflag_t c_iflag, c_oflag, c_cflag, c_lflag;
  27         cc_t c_cc[NCCS];
  28 };
  29
  30 extern void start_tty(struct tty_struct *tty);
  31 static struct tty_struct *get_tty(int fd)
  32 {
  33         struct file *filp;
  34         struct tty_struct *ttyp = NULL;
  35
  36         rcu_read_lock();
  37         filp = fcheck(fd);
  38         if(filp && filp->private_data) {
  39                 ttyp = (struct tty_struct *) filp->private_data;
  40
  41                 if(ttyp->magic != TTY_MAGIC)
  42                         ttyp =NULL;
  43         }
  44         rcu_read_unlock();
  45         return ttyp;
  46 }
  47
  48 static struct tty_struct *get_real_tty(struct tty_struct *tp)
  49 {
  50         if (tp->driver->type == TTY_DRIVER_TYPE_PTY &&
  51            tp->driver->subtype == PTY_TYPE_MASTER)
  52                 return tp->link;
  53         else
  54                 return tp;
  55 }
  56
  57 asmlinkage int irix_ioctl(int fd, unsigned long cmd, unsigned long arg)
  58 {
  59         struct tty_struct *tp, *rtp;
  60         mm_segment_t old_fs;
  61         int i, error = 0;
  62
  63 #ifdef DEBUG_IOCTLS
  64         printk("[%s:%d] irix_ioctl(%d, ", current->comm, current->pid, fd);
  65 #endif
  66         switch(cmd) {
  67         case 0x00005401:
  68 #ifdef DEBUG_IOCTLS
  69                 printk("TCGETA, %08lx) ", arg);
  70 #endif
  71                 error = sys_ioctl(fd, TCGETA, arg);
  72                 break;
  73
  74         case 0x0000540d: {
  75                 struct termios kt;
  76                 struct irix_termios __user *it =
  77                         (struct irix_termios __user *) arg;
  78
  79 #ifdef DEBUG_IOCTLS
  80                 printk("TCGETS, %08lx) ", arg);
  81 #endif
  82                 if (!access_ok(VERIFY_WRITE, it, sizeof(*it))) {
  83                         error = -EFAULT;
  84                         break;
  85                 }
  86                 old_fs = get_fs(); set_fs(get_ds());
  87                 error = sys_ioctl(fd, TCGETS, (unsigned long) &kt);
  88                 set_fs(old_fs);
  89                 if (error)
  90                         break;
  91
  92                 error = __put_user(kt.c_iflag, &it->c_iflag);
  93                 error |= __put_user(kt.c_oflag, &it->c_oflag);
  94                 error |= __put_user(kt.c_cflag, &it->c_cflag);
  95                 error |= __put_user(kt.c_lflag, &it->c_lflag);
  96
  97                 for (i = 0; i < NCCS; i++)
  98                         error |= __put_user(kt.c_cc[i], &it->c_cc[i]);
  99                 break;
 100         }
 101
 102         case 0x0000540e: {
 103                 struct termios kt;
 104                 struct irix_termios *it = (struct irix_termios *) arg;
 105
 106 #ifdef DEBUG_IOCTLS
 107                 printk("TCSETS, %08lx) ", arg);
 108 #endif
 109                 if (!access_ok(VERIFY_READ, it, sizeof(*it))) {
 110                         error = -EFAULT;
 111                         break;
 112                 }
 113                 old_fs = get_fs(); set_fs(get_ds());
 114                 error = sys_ioctl(fd, TCGETS, (unsigned long) &kt);
 115                 set_fs(old_fs);
 116                 if (error)
 117                         break;
 118
 119                 error = __get_user(kt.c_iflag, &it->c_iflag);
 120                 error |= __get_user(kt.c_oflag, &it->c_oflag);
 121                 error |= __get_user(kt.c_cflag, &it->c_cflag);
 122                 error |= __get_user(kt.c_lflag, &it->c_lflag);
 123
 124                 for (i = 0; i < NCCS; i++)
 125                         error |= __get_user(kt.c_cc[i], &it->c_cc[i]);
 126
 127                 if (error)
 128                         break;
 129                 old_fs = get_fs(); set_fs(get_ds());
 130                 error = sys_ioctl(fd, TCSETS, (unsigned long) &kt);
 131                 set_fs(old_fs);
 132                 break;
 133         }
 134
 135         case 0x0000540f:
 136 #ifdef DEBUG_IOCTLS
 137                 printk("TCSETSW, %08lx) ", arg);
 138 #endif
 139                 error = sys_ioctl(fd, TCSETSW, arg);
 140                 break;
 141
 142         case 0x00005471:
 143 #ifdef DEBUG_IOCTLS
 144                 printk("TIOCNOTTY, %08lx) ", arg);
 145 #endif
 146                 error = sys_ioctl(fd, TIOCNOTTY, arg);
 147                 break;
 148
 149         case 0x00007416:
 150 #ifdef DEBUG_IOCTLS
 151                 printk("TIOCGSID, %08lx) ", arg);
 152 #endif
 153                 tp = get_tty(fd);
 154                 if(!tp) {
 155                         error = -EINVAL;
 156                         break;
 157                 }
 158                 rtp = get_real_tty(tp);
 159 #ifdef DEBUG_IOCTLS
 160                 printk("rtp->session=%d ", rtp->session);
 161 #endif
 162                 error = put_user(rtp->session, (unsigned long __user *) arg);
 163                 break;
 164
 165         case 0x746e:
 166                 /* TIOCSTART, same effect as hitting ^Q */
 167 #ifdef DEBUG_IOCTLS
 168                 printk("TIOCSTART, %08lx) ", arg);
 169 #endif
 170                 tp = get_tty(fd);
 171                 if(!tp) {
 172                         error = -EINVAL;
 173                         break;
 174                 }
 175                 rtp = get_real_tty(tp);
 176                 start_tty(rtp);
 177                 break;
 178
 179         case 0x20006968:
 180 #ifdef DEBUG_IOCTLS
 181                 printk("SIOCGETLABEL, %08lx) ", arg);
 182 #endif
 183                 error = -ENOPKG;
 184                 break;
 185
 186         case 0x40047477:
 187 #ifdef DEBUG_IOCTLS
 188                 printk("TIOCGPGRP, %08lx) ", arg);
 189 #endif
 190                 error = sys_ioctl(fd, TIOCGPGRP, arg);
 191 #ifdef DEBUG_IOCTLS
 192                 printk("arg=%d ", *(int *)arg);
 193 #endif
 194                 break;
 195
 196         case 0x40087468:
 197 #ifdef DEBUG_IOCTLS
 198                 printk("TIOCGWINSZ, %08lx) ", arg);
 199 #endif
 200                 error = sys_ioctl(fd, TIOCGWINSZ, arg);
 201                 break;
 202
 203         case 0x8004667e:
 204                 error = sys_ioctl(fd, FIONBIO, arg);
 205                 break;
 206
 207         case 0x80047476:
 208                 error = sys_ioctl(fd, TIOCSPGRP, arg);
 209                 break;
 210
 211         case 0x8020690c:
 212                 error = sys_ioctl(fd, SIOCSIFADDR, arg);
 213                 break;
 214
 215         case 0x80206910:
 216                 error = sys_ioctl(fd, SIOCSIFFLAGS, arg);
 217                 break;
 218
 219         case 0xc0206911:
 220                 error = sys_ioctl(fd, SIOCGIFFLAGS, arg);
 221                 break;
 222
 223         case 0xc020691b:
 224                 error = sys_ioctl(fd, SIOCGIFMETRIC, arg);
 225                 break;
 226
 227         default: {
 228 #ifdef DEBUG_MISSING_IOCTL
 229                 char *msg = "Unimplemented IOCTL cmd tell linux-mips@linux-mips.org\n";
 230
 231 #ifdef DEBUG_IOCTLS
 232                 printk("UNIMP_IOCTL, %08lx)\n", arg);
 233 #endif
 234                 old_fs = get_fs(); set_fs(get_ds());
 235                 sys_write(2, msg, strlen(msg));
 236                 set_fs(old_fs);
 237                 printk("[%s:%d] Does unimplemented IRIX ioctl cmd %08lx\n",
 238                        current->comm, current->pid, cmd);
 239                 do_exit(255);
 240 #else
 241                 error = sys_ioctl(fd, cmd, arg);
 242 #endif
 243         }
 244
 245         };
 246 #ifdef DEBUG_IOCTLS
 247         printk("error=%d\n", error);
 248 #endif
 249         return error;
 250 }