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