arch/m68knommu/kernel/sys_m68k.c

   1 /*
   2  * linux/arch/m68knommu/kernel/sys_m68k.c
   3  *
   4  * This file contains various random system calls that
   5  * have a non-standard calling sequence on the Linux/m68k
   6  * platform.
   7  */
   8
   9 #include <linux/errno.h>
  10 #include <linux/sched.h>
  11 #include <linux/mm.h>
  12 #include <linux/smp.h>
  13 #include <linux/sem.h>
  14 #include <linux/msg.h>
  15 #include <linux/shm.h>
  16 #include <linux/stat.h>
  17 #include <linux/syscalls.h>
  18 #include <linux/mman.h>
  19 #include <linux/file.h>
  20 #include <linux/ipc.h>
  21 #include <linux/fs.h>
  22
  23 #include <asm/setup.h>
  24 #include <asm/uaccess.h>
  25 #include <asm/cachectl.h>
  26 #include <asm/traps.h>
  27 #include <asm/cacheflush.h>
  28 #include <asm/unistd.h>
  29
  30 /*
  31  * Perform the select(nd, in, out, ex, tv) and mmap() system
  32  * calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
  33  * handle more than 4 system call parameters, so these system calls
  34  * used a memory block for parameter passing..
  35  */
  36
  37 struct mmap_arg_struct {
  38         unsigned long addr;
  39         unsigned long len;
  40         unsigned long prot;
  41         unsigned long flags;
  42         unsigned long fd;
  43         unsigned long offset;
  44 };
  45
  46 asmlinkage int old_mmap(struct mmap_arg_struct *arg)
  47 {
  48         struct mmap_arg_struct a;
  49         int error = -EFAULT;
  50
  51         if (copy_from_user(&a, arg, sizeof(a)))
  52                 goto out;
  53
  54         error = -EINVAL;
  55         if (a.offset & ~PAGE_MASK)
  56                 goto out;
  57
  58         error = sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
  59                                 a.offset >> PAGE_SHIFT);
  60 out:
  61         return error;
  62 }
  63
  64 struct sel_arg_struct {
  65         unsigned long n;
  66         fd_set *inp, *outp, *exp;
  67         struct timeval *tvp;
  68 };
  69
  70 asmlinkage int old_select(struct sel_arg_struct *arg)
  71 {
  72         struct sel_arg_struct a;
  73
  74         if (copy_from_user(&a, arg, sizeof(a)))
  75                 return -EFAULT;
  76         /* sys_select() does the appropriate kernel locking */
  77         return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
  78 }
  79
  80 /*
  81  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  82  *
  83  * This is really horribly ugly.
  84  */
  85 asmlinkage int sys_ipc (uint call, int first, int second,
  86                         int third, void *ptr, long fifth)
  87 {
  88         int version, ret;
  89
  90         version = call >> 16; /* hack for backward compatibility */
  91         call &= 0xffff;
  92
  93         if (call <= SEMCTL)
  94                 switch (call) {
  95                 case SEMOP:
  96                         return sys_semop (first, (struct sembuf *)ptr, second);
  97                 case SEMGET:
  98                         return sys_semget (first, second, third);
  99                 case SEMCTL: {
 100                         union semun fourth;
 101                         if (!ptr)
 102                                 return -EINVAL;
 103                         if (get_user(fourth.__pad, (void **) ptr))
 104                                 return -EFAULT;
 105                         return sys_semctl (first, second, third, fourth);
 106                         }
 107                 default:
 108                         return -EINVAL;
 109                 }
 110         if (call <= MSGCTL)
 111                 switch (call) {
 112                 case MSGSND:
 113                         return sys_msgsnd (first, (struct msgbuf *) ptr,
 114                                           second, third);
 115                 case MSGRCV:
 116                         switch (version) {
 117                         case 0: {
 118                                 struct ipc_kludge tmp;
 119                                 if (!ptr)
 120                                         return -EINVAL;
 121                                 if (copy_from_user (&tmp,
 122                                                     (struct ipc_kludge *)ptr,
 123                                                     sizeof (tmp)))
 124                                         return -EFAULT;
 125                                 return sys_msgrcv (first, tmp.msgp, second,
 126                                                    tmp.msgtyp, third);
 127                                 }
 128                         default:
 129                                 return sys_msgrcv (first,
 130                                                    (struct msgbuf *) ptr,
 131                                                    second, fifth, third);
 132                         }
 133                 case MSGGET:
 134                         return sys_msgget ((key_t) first, second);
 135                 case MSGCTL:
 136                         return sys_msgctl (first, second,
 137                                            (struct msqid_ds *) ptr);
 138                 default:
 139                         return -EINVAL;
 140                 }
 141         if (call <= SHMCTL)
 142                 switch (call) {
 143                 case SHMAT:
 144                         switch (version) {
 145                         default: {
 146                                 ulong raddr;
 147                                 ret = do_shmat (first, ptr, second, &raddr);
 148                                 if (ret)
 149                                         return ret;
 150                                 return put_user (raddr, (ulong __user *) third);
 151                         }
 152                         }
 153                 case SHMDT:
 154                         return sys_shmdt (ptr);
 155                 case SHMGET:
 156                         return sys_shmget (first, second, third);
 157                 case SHMCTL:
 158                         return sys_shmctl (first, second, ptr);
 159                 default:
 160                         return -ENOSYS;
 161                 }
 162
 163         return -EINVAL;
 164 }
 165
 166 /* sys_cacheflush -- flush (part of) the processor cache.  */
 167 asmlinkage int
 168 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
 169 {
 170         flush_cache_all();
 171         return(0);
 172 }
 173
 174 asmlinkage int sys_getpagesize(void)
 175 {
 176         return PAGE_SIZE;
 177 }
 178
 179 /*
 180  * Do a system call from kernel instead of calling sys_execve so we
 181  * end up with proper pt_regs.
 182  */
 183 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 184 {
 185         register long __res asm ("%d0") = __NR_execve;
 186         register long __a asm ("%d1") = (long)(filename);
 187         register long __b asm ("%d2") = (long)(argv);
 188         register long __c asm ("%d3") = (long)(envp);
 189         asm volatile ("trap  #0" : "+d" (__res)
 190                         : "d" (__a), "d" (__b), "d" (__c));
 191         return __res;
 192 }
 193
 194 asmlinkage unsigned long sys_get_thread_area(void)
 195 {
 196         return current_thread_info()->tp_value;
 197 }
 198
 199 asmlinkage int sys_set_thread_area(unsigned long tp)
 200 {
 201         current_thread_info()->tp_value = tp;
 202         return 0;
 203 }
 204
 205 /* This syscall gets its arguments in A0 (mem), D2 (oldval) and
 206    D1 (newval).  */
 207 asmlinkage int
 208 sys_atomic_cmpxchg_32(unsigned long newval, int oldval, int d3, int d4, int d5,
 209                       unsigned long __user * mem)
 210 {
 211         struct mm_struct *mm = current->mm;
 212         unsigned long mem_value;
 213
 214         down_read(&mm->mmap_sem);
 215
 216         mem_value = *mem;
 217         if (mem_value == oldval)
 218                 *mem = newval;
 219
 220         up_read(&mm->mmap_sem);
 221         return mem_value;
 222 }
 223
 224 asmlinkage int sys_atomic_barrier(void)
 225 {
 226         /* no code needed for uniprocs */
 227         return 0;
 228 }