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/utsname.h>
  21
  22 #include <asm/setup.h>
  23 #include <asm/uaccess.h>
  24 #include <asm/cachectl.h>
  25 #include <asm/traps.h>
  26 #include <asm/ipc.h>
  27 #include <asm/cacheflush.h>
  28 #include <asm/unistd.h>
  29
  30 /*
  31  * sys_pipe() is the normal C calling standard for creating
  32  * a pipe. It's not the way unix traditionally does this, though.
  33  */
  34 asmlinkage int sys_pipe(unsigned long * fildes)
  35 {
  36         int fd[2];
  37         int error;
  38
  39         error = do_pipe(fd);
  40         if (!error) {
  41                 if (copy_to_user(fildes, fd, 2*sizeof(int)))
  42                         error = -EFAULT;
  43         }
  44         return error;
  45 }
  46
  47 /* common code for old and new mmaps */
  48 static inline long do_mmap2(
  49         unsigned long addr, unsigned long len,
  50         unsigned long prot, unsigned long flags,
  51         unsigned long fd, unsigned long pgoff)
  52 {
  53         int error = -EBADF;
  54         struct file * file = NULL;
  55
  56         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  57         if (!(flags & MAP_ANONYMOUS)) {
  58                 file = fget(fd);
  59                 if (!file)
  60                         goto out;
  61         }
  62
  63         down_write(&current->mm->mmap_sem);
  64         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  65         up_write(&current->mm->mmap_sem);
  66
  67         if (file)
  68                 fput(file);
  69 out:
  70         return error;
  71 }
  72
  73 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
  74         unsigned long prot, unsigned long flags,
  75         unsigned long fd, unsigned long pgoff)
  76 {
  77         return do_mmap2(addr, len, prot, flags, fd, pgoff);
  78 }
  79
  80 /*
  81  * Perform the select(nd, in, out, ex, tv) and mmap() system
  82  * calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
  83  * handle more than 4 system call parameters, so these system calls
  84  * used a memory block for parameter passing..
  85  */
  86
  87 struct mmap_arg_struct {
  88         unsigned long addr;
  89         unsigned long len;
  90         unsigned long prot;
  91         unsigned long flags;
  92         unsigned long fd;
  93         unsigned long offset;
  94 };
  95
  96 asmlinkage int old_mmap(struct mmap_arg_struct *arg)
  97 {
  98         struct mmap_arg_struct a;
  99         int error = -EFAULT;
 100
 101         if (copy_from_user(&a, arg, sizeof(a)))
 102                 goto out;
 103
 104         error = -EINVAL;
 105         if (a.offset & ~PAGE_MASK)
 106                 goto out;
 107
 108         a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 109
 110         error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
 111 out:
 112         return error;
 113 }
 114
 115 struct sel_arg_struct {
 116         unsigned long n;
 117         fd_set *inp, *outp, *exp;
 118         struct timeval *tvp;
 119 };
 120
 121 asmlinkage int old_select(struct sel_arg_struct *arg)
 122 {
 123         struct sel_arg_struct a;
 124
 125         if (copy_from_user(&a, arg, sizeof(a)))
 126                 return -EFAULT;
 127         /* sys_select() does the appropriate kernel locking */
 128         return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
 129 }
 130
 131 /*
 132  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 133  *
 134  * This is really horribly ugly.
 135  */
 136 asmlinkage int sys_ipc (uint call, int first, int second,
 137                         int third, void *ptr, long fifth)
 138 {
 139         int version, ret;
 140
 141         version = call >> 16; /* hack for backward compatibility */
 142         call &= 0xffff;
 143
 144         if (call <= SEMCTL)
 145                 switch (call) {
 146                 case SEMOP:
 147                         return sys_semop (first, (struct sembuf *)ptr, second);
 148                 case SEMGET:
 149                         return sys_semget (first, second, third);
 150                 case SEMCTL: {
 151                         union semun fourth;
 152                         if (!ptr)
 153                                 return -EINVAL;
 154                         if (get_user(fourth.__pad, (void **) ptr))
 155                                 return -EFAULT;
 156                         return sys_semctl (first, second, third, fourth);
 157                         }
 158                 default:
 159                         return -EINVAL;
 160                 }
 161         if (call <= MSGCTL)
 162                 switch (call) {
 163                 case MSGSND:
 164                         return sys_msgsnd (first, (struct msgbuf *) ptr,
 165                                           second, third);
 166                 case MSGRCV:
 167                         switch (version) {
 168                         case 0: {
 169                                 struct ipc_kludge tmp;
 170                                 if (!ptr)
 171                                         return -EINVAL;
 172                                 if (copy_from_user (&tmp,
 173                                                     (struct ipc_kludge *)ptr,
 174                                                     sizeof (tmp)))
 175                                         return -EFAULT;
 176                                 return sys_msgrcv (first, tmp.msgp, second,
 177                                                    tmp.msgtyp, third);
 178                                 }
 179                         default:
 180                                 return sys_msgrcv (first,
 181                                                    (struct msgbuf *) ptr,
 182                                                    second, fifth, third);
 183                         }
 184                 case MSGGET:
 185                         return sys_msgget ((key_t) first, second);
 186                 case MSGCTL:
 187                         return sys_msgctl (first, second,
 188                                            (struct msqid_ds *) ptr);
 189                 default:
 190                         return -EINVAL;
 191                 }
 192         if (call <= SHMCTL)
 193                 switch (call) {
 194                 case SHMAT:
 195                         switch (version) {
 196                         default: {
 197                                 ulong raddr;
 198                                 ret = do_shmat (first, ptr, second, &raddr);
 199                                 if (ret)
 200                                         return ret;
 201                                 return put_user (raddr, (ulong __user *) third);
 202                         }
 203                         }
 204                 case SHMDT:
 205                         return sys_shmdt (ptr);
 206                 case SHMGET:
 207                         return sys_shmget (first, second, third);
 208                 case SHMCTL:
 209                         return sys_shmctl (first, second, ptr);
 210                 default:
 211                         return -ENOSYS;
 212                 }
 213
 214         return -EINVAL;
 215 }
 216
 217 /* sys_cacheflush -- flush (part of) the processor cache.  */
 218 asmlinkage int
 219 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
 220 {
 221         flush_cache_all();
 222         return(0);
 223 }
 224
 225 asmlinkage int sys_getpagesize(void)
 226 {
 227         return PAGE_SIZE;
 228 }
 229
 230 /*
 231  * Do a system call from kernel instead of calling sys_execve so we
 232  * end up with proper pt_regs.
 233  */
 234 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 235 {
 236         register long __res asm ("%d0") = __NR_execve;
 237         register long __a asm ("%d1") = (long)(filename);
 238         register long __b asm ("%d2") = (long)(argv);
 239         register long __c asm ("%d3") = (long)(envp);
 240         asm volatile ("trap  #0" : "+d" (__res)
 241                         : "d" (__a), "d" (__b), "d" (__c));
 242         return __res;
 243 }