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 #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/ipc.h>
  28 #include <asm/cacheflush.h>
  29 #include <asm/unistd.h>
  30
  31 /*
  32  * sys_pipe() is the normal C calling standard for creating
  33  * a pipe. It's not the way unix traditionally does this, though.
  34  */
  35 asmlinkage int sys_pipe(unsigned long * fildes)
  36 {
  37         int fd[2];
  38         int error;
  39
  40         error = do_pipe(fd);
  41         if (!error) {
  42                 if (copy_to_user(fildes, fd, 2*sizeof(int)))
  43                         error = -EFAULT;
  44         }
  45         return error;
  46 }
  47
  48 /* common code for old and new mmaps */
  49 static inline long do_mmap2(
  50         unsigned long addr, unsigned long len,
  51         unsigned long prot, unsigned long flags,
  52         unsigned long fd, unsigned long pgoff)
  53 {
  54         int error = -EBADF;
  55         struct file * file = NULL;
  56
  57         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  58         if (!(flags & MAP_ANONYMOUS)) {
  59                 file = fget(fd);
  60                 if (!file)
  61                         goto out;
  62         }
  63
  64         down_write(&current->mm->mmap_sem);
  65         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  66         up_write(&current->mm->mmap_sem);
  67
  68         if (file)
  69                 fput(file);
  70 out:
  71         return error;
  72 }
  73
  74 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
  75         unsigned long prot, unsigned long flags,
  76         unsigned long fd, unsigned long pgoff)
  77 {
  78         return do_mmap2(addr, len, prot, flags, fd, pgoff);
  79 }
  80
  81 /*
  82  * Perform the select(nd, in, out, ex, tv) and mmap() system
  83  * calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
  84  * handle more than 4 system call parameters, so these system calls
  85  * used a memory block for parameter passing..
  86  */
  87
  88 struct mmap_arg_struct {
  89         unsigned long addr;
  90         unsigned long len;
  91         unsigned long prot;
  92         unsigned long flags;
  93         unsigned long fd;
  94         unsigned long offset;
  95 };
  96
  97 asmlinkage int old_mmap(struct mmap_arg_struct *arg)
  98 {
  99         struct mmap_arg_struct a;
 100         int error = -EFAULT;
 101
 102         if (copy_from_user(&a, arg, sizeof(a)))
 103                 goto out;
 104
 105         error = -EINVAL;
 106         if (a.offset & ~PAGE_MASK)
 107                 goto out;
 108
 109         a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 110
 111         error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
 112 out:
 113         return error;
 114 }
 115
 116 struct sel_arg_struct {
 117         unsigned long n;
 118         fd_set *inp, *outp, *exp;
 119         struct timeval *tvp;
 120 };
 121
 122 asmlinkage int old_select(struct sel_arg_struct *arg)
 123 {
 124         struct sel_arg_struct a;
 125
 126         if (copy_from_user(&a, arg, sizeof(a)))
 127                 return -EFAULT;
 128         /* sys_select() does the appropriate kernel locking */
 129         return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
 130 }
 131
 132 /*
 133  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 134  *
 135  * This is really horribly ugly.
 136  */
 137 asmlinkage int sys_ipc (uint call, int first, int second,
 138                         int third, void *ptr, long fifth)
 139 {
 140         int version, ret;
 141
 142         version = call >> 16; /* hack for backward compatibility */
 143         call &= 0xffff;
 144
 145         if (call <= SEMCTL)
 146                 switch (call) {
 147                 case SEMOP:
 148                         return sys_semop (first, (struct sembuf *)ptr, second);
 149                 case SEMGET:
 150                         return sys_semget (first, second, third);
 151                 case SEMCTL: {
 152                         union semun fourth;
 153                         if (!ptr)
 154                                 return -EINVAL;
 155                         if (get_user(fourth.__pad, (void **) ptr))
 156                                 return -EFAULT;
 157                         return sys_semctl (first, second, third, fourth);
 158                         }
 159                 default:
 160                         return -EINVAL;
 161                 }
 162         if (call <= MSGCTL)
 163                 switch (call) {
 164                 case MSGSND:
 165                         return sys_msgsnd (first, (struct msgbuf *) ptr,
 166                                           second, third);
 167                 case MSGRCV:
 168                         switch (version) {
 169                         case 0: {
 170                                 struct ipc_kludge tmp;
 171                                 if (!ptr)
 172                                         return -EINVAL;
 173                                 if (copy_from_user (&tmp,
 174                                                     (struct ipc_kludge *)ptr,
 175                                                     sizeof (tmp)))
 176                                         return -EFAULT;
 177                                 return sys_msgrcv (first, tmp.msgp, second,
 178                                                    tmp.msgtyp, third);
 179                                 }
 180                         default:
 181                                 return sys_msgrcv (first,
 182                                                    (struct msgbuf *) ptr,
 183                                                    second, fifth, third);
 184                         }
 185                 case MSGGET:
 186                         return sys_msgget ((key_t) first, second);
 187                 case MSGCTL:
 188                         return sys_msgctl (first, second,
 189                                            (struct msqid_ds *) ptr);
 190                 default:
 191                         return -EINVAL;
 192                 }
 193         if (call <= SHMCTL)
 194                 switch (call) {
 195                 case SHMAT:
 196                         switch (version) {
 197                         default: {
 198                                 ulong raddr;
 199                                 ret = do_shmat (first, ptr, second, &raddr);
 200                                 if (ret)
 201                                         return ret;
 202                                 return put_user (raddr, (ulong __user *) third);
 203                         }
 204                         }
 205                 case SHMDT:
 206                         return sys_shmdt (ptr);
 207                 case SHMGET:
 208                         return sys_shmget (first, second, third);
 209                 case SHMCTL:
 210                         return sys_shmctl (first, second, ptr);
 211                 default:
 212                         return -ENOSYS;
 213                 }
 214
 215         return -EINVAL;
 216 }
 217
 218 /* sys_cacheflush -- flush (part of) the processor cache.  */
 219 asmlinkage int
 220 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
 221 {
 222         flush_cache_all();
 223         return(0);
 224 }
 225
 226 asmlinkage int sys_getpagesize(void)
 227 {
 228         return PAGE_SIZE;
 229 }
 230
 231 /*
 232  * Do a system call from kernel instead of calling sys_execve so we
 233  * end up with proper pt_regs.
 234  */
 235 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 236 {
 237         register long __res asm ("%d0") = __NR_execve;
 238         register long __a asm ("%d1") = (long)(filename);
 239         register long __b asm ("%d2") = (long)(argv);
 240         register long __c asm ("%d3") = (long)(envp);
 241         asm volatile ("trap  #0" : "+d" (__res)
 242                         : "d" (__a), "d" (__b), "d" (__c));
 243         return __res;
 244 }