arch/sh/kernel/sys_sh.c

   1 /*
   2  * linux/arch/sh/kernel/sys_sh.c
   3  *
   4  * This file contains various random system calls that
   5  * have a non-standard calling sequence on the Linux/SuperH
   6  * platform.
   7  *
   8  * Taken from i386 version.
   9  */
  10 #include <linux/errno.h>
  11 #include <linux/sched.h>
  12 #include <linux/mm.h>
  13 #include <linux/smp.h>
  14 #include <linux/sem.h>
  15 #include <linux/msg.h>
  16 #include <linux/shm.h>
  17 #include <linux/stat.h>
  18 #include <linux/syscalls.h>
  19 #include <linux/mman.h>
  20 #include <linux/file.h>
  21 #include <linux/utsname.h>
  22 #include <linux/module.h>
  23 #include <linux/fs.h>
  24 #include <linux/ipc.h>
  25 #include <asm/syscalls.h>
  26 #include <asm/uaccess.h>
  27 #include <asm/unistd.h>
  28 #include <asm/cacheflush.h>
  29 #include <asm/cachectl.h>
  30
  31 asmlinkage int old_mmap(unsigned long addr, unsigned long len,
  32         unsigned long prot, unsigned long flags,
  33         int fd, unsigned long off)
  34 {
  35         if (off & ~PAGE_MASK)
  36                 return -EINVAL;
  37         return sys_mmap_pgoff(addr, len, prot, flags, fd, off>>PAGE_SHIFT);
  38 }
  39
  40 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
  41         unsigned long prot, unsigned long flags,
  42         unsigned long fd, unsigned long pgoff)
  43 {
  44         /*
  45          * The shift for mmap2 is constant, regardless of PAGE_SIZE
  46          * setting.
  47          */
  48         if (pgoff & ((1 << (PAGE_SHIFT - 12)) - 1))
  49                 return -EINVAL;
  50
  51         pgoff >>= PAGE_SHIFT - 12;
  52
  53         return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff);
  54 }
  55
  56 /*
  57  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  58  *
  59  * This is really horribly ugly.
  60  */
  61 asmlinkage int sys_ipc(uint call, int first, int second,
  62                        int third, void __user *ptr, long fifth)
  63 {
  64         int version, ret;
  65
  66         version = call >> 16; /* hack for backward compatibility */
  67         call &= 0xffff;
  68
  69         if (call <= SEMTIMEDOP)
  70                 switch (call) {
  71                 case SEMOP:
  72                         return sys_semtimedop(first,
  73                                               (struct sembuf __user *)ptr,
  74                                               second, NULL);
  75                 case SEMTIMEDOP:
  76                         return sys_semtimedop(first,
  77                                 (struct sembuf __user *)ptr, second,
  78                                 (const struct timespec __user *)fifth);
  79                 case SEMGET:
  80                         return sys_semget (first, second, third);
  81                 case SEMCTL: {
  82                         union semun fourth;
  83                         if (!ptr)
  84                                 return -EINVAL;
  85                         if (get_user(fourth.__pad, (void __user * __user *) ptr))
  86                                 return -EFAULT;
  87                         return sys_semctl (first, second, third, fourth);
  88                         }
  89                 default:
  90                         return -EINVAL;
  91                 }
  92
  93         if (call <= MSGCTL)
  94                 switch (call) {
  95                 case MSGSND:
  96                         return sys_msgsnd (first, (struct msgbuf __user *) ptr,
  97                                           second, third);
  98                 case MSGRCV:
  99                         switch (version) {
 100                         case 0:
 101                         {
 102                                 struct ipc_kludge tmp;
 103
 104                                 if (!ptr)
 105                                         return -EINVAL;
 106
 107                                 if (copy_from_user(&tmp,
 108                                         (struct ipc_kludge __user *) ptr,
 109                                                    sizeof (tmp)))
 110                                         return -EFAULT;
 111
 112                                 return sys_msgrcv (first, tmp.msgp, second,
 113                                                    tmp.msgtyp, third);
 114                         }
 115                         default:
 116                                 return sys_msgrcv (first,
 117                                                    (struct msgbuf __user *) ptr,
 118                                                    second, fifth, third);
 119                         }
 120                 case MSGGET:
 121                         return sys_msgget ((key_t) first, second);
 122                 case MSGCTL:
 123                         return sys_msgctl (first, second,
 124                                            (struct msqid_ds __user *) ptr);
 125                 default:
 126                         return -EINVAL;
 127                 }
 128         if (call <= SHMCTL)
 129                 switch (call) {
 130                 case SHMAT:
 131                         switch (version) {
 132                         default: {
 133                                 ulong raddr;
 134                                 ret = do_shmat (first, (char __user *) ptr,
 135                                                  second, &raddr);
 136                                 if (ret)
 137                                         return ret;
 138                                 return put_user (raddr, (ulong __user *) third);
 139                         }
 140                         case 1: /* iBCS2 emulator entry point */
 141                                 if (!segment_eq(get_fs(), get_ds()))
 142                                         return -EINVAL;
 143                                 return do_shmat (first, (char __user *) ptr,
 144                                                   second, (ulong *) third);
 145                         }
 146                 case SHMDT:
 147                         return sys_shmdt ((char __user *)ptr);
 148                 case SHMGET:
 149                         return sys_shmget (first, second, third);
 150                 case SHMCTL:
 151                         return sys_shmctl (first, second,
 152                                            (struct shmid_ds __user *) ptr);
 153                 default:
 154                         return -EINVAL;
 155                 }
 156
 157         return -EINVAL;
 158 }
 159
 160 /* sys_cacheflush -- flush (part of) the processor cache.  */
 161 asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len, int op)
 162 {
 163         struct vm_area_struct *vma;
 164
 165         if ((op <= 0) || (op > (CACHEFLUSH_D_PURGE|CACHEFLUSH_I)))
 166                 return -EINVAL;
 167
 168         /*
 169          * Verify that the specified address region actually belongs
 170          * to this process.
 171          */
 172         if (addr + len < addr)
 173                 return -EFAULT;
 174
 175         down_read(&current->mm->mmap_sem);
 176         vma = find_vma (current->mm, addr);
 177         if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end) {
 178                 up_read(&current->mm->mmap_sem);
 179                 return -EFAULT;
 180         }
 181
 182         switch (op & CACHEFLUSH_D_PURGE) {
 183                 case CACHEFLUSH_D_INVAL:
 184                         __flush_invalidate_region((void *)addr, len);
 185                         break;
 186                 case CACHEFLUSH_D_WB:
 187                         __flush_wback_region((void *)addr, len);
 188                         break;
 189                 case CACHEFLUSH_D_PURGE:
 190                         __flush_purge_region((void *)addr, len);
 191                         break;
 192         }
 193
 194         if (op & CACHEFLUSH_I)
 195                 flush_cache_all();
 196
 197         up_read(&current->mm->mmap_sem);
 198         return 0;
 199 }
 200
 201 asmlinkage int sys_uname(struct old_utsname __user *name)
 202 {
 203         int err;
 204         if (!name)
 205                 return -EFAULT;
 206         down_read(&uts_sem);
 207         err = copy_to_user(name, utsname(), sizeof(*name));
 208         up_read(&uts_sem);
 209         return err?-EFAULT:0;
 210 }