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