arch/h8300/kernel/sys_h8300.c

   1 /*
   2  * linux/arch/h8300/kernel/sys_h8300.c
   3  *
   4  * This file contains various random system calls that
   5  * have a non-standard calling sequence on the H8/300
   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/smp_lock.h>
  14 #include <linux/sem.h>
  15 #include <linux/msg.h>
  16 #include <linux/shm.h>
  17 #include <linux/stat.h>
  18 #include <linux/syscalls.h>
  19 #include <linux/mman.h>
  20 #include <linux/file.h>
  21 #include <linux/utsname.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
  29 /*
  30  * sys_pipe() is the normal C calling standard for creating
  31  * a pipe. It's not the way unix traditionally does this, though.
  32  */
  33 asmlinkage int sys_pipe(unsigned long * fildes)
  34 {
  35         int fd[2];
  36         int error;
  37
  38         error = do_pipe(fd);
  39         if (!error) {
  40                 if (copy_to_user(fildes, fd, 2*sizeof(int)))
  41                         error = -EFAULT;
  42         }
  43         return error;
  44 }
  45
  46 /* common code for old and new mmaps */
  47 static inline long do_mmap2(
  48         unsigned long addr, unsigned long len,
  49         unsigned long prot, unsigned long flags,
  50         unsigned long fd, unsigned long pgoff)
  51 {
  52         int error = -EBADF;
  53         struct file * file = NULL;
  54
  55         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  56         if (!(flags & MAP_ANONYMOUS)) {
  57                 file = fget(fd);
  58                 if (!file)
  59                         goto out;
  60         }
  61
  62         down_write(&current->mm->mmap_sem);
  63         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  64         up_write(&current->mm->mmap_sem);
  65
  66         if (file)
  67                 fput(file);
  68 out:
  69         return error;
  70 }
  71
  72 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
  73         unsigned long prot, unsigned long flags,
  74         unsigned long fd, unsigned long pgoff)
  75 {
  76         return do_mmap2(addr, len, prot, flags, fd, pgoff);
  77 }
  78
  79 /*
  80  * Perform the select(nd, in, out, ex, tv) and mmap() system
  81  * calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
  82  * handle more than 4 system call parameters, so these system calls
  83  * used a memory block for parameter passing..
  84  */
  85
  86 struct mmap_arg_struct {
  87         unsigned long addr;
  88         unsigned long len;
  89         unsigned long prot;
  90         unsigned long flags;
  91         unsigned long fd;
  92         unsigned long offset;
  93 };
  94
  95 asmlinkage int old_mmap(struct mmap_arg_struct *arg)
  96 {
  97         struct mmap_arg_struct a;
  98         int error = -EFAULT;
  99
 100         if (copy_from_user(&a, arg, sizeof(a)))
 101                 goto out;
 102
 103         error = -EINVAL;
 104         if (a.offset & ~PAGE_MASK)
 105                 goto out;
 106
 107         a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 108
 109         error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
 110 out:
 111         return error;
 112 }
 113
 114 #if 0 /* DAVIDM - do we want this */
 115 struct mmap_arg_struct64 {
 116         __u32 addr;
 117         __u32 len;
 118         __u32 prot;
 119         __u32 flags;
 120         __u64 offset; /* 64 bits */
 121         __u32 fd;
 122 };
 123
 124 asmlinkage long sys_mmap64(struct mmap_arg_struct64 *arg)
 125 {
 126         int error = -EFAULT;
 127         struct file * file = NULL;
 128         struct mmap_arg_struct64 a;
 129         unsigned long pgoff;
 130
 131         if (copy_from_user(&a, arg, sizeof(a)))
 132                 return -EFAULT;
 133
 134         if ((long)a.offset & ~PAGE_MASK)
 135                 return -EINVAL;
 136
 137         pgoff = a.offset >> PAGE_SHIFT;
 138         if ((a.offset >> PAGE_SHIFT) != pgoff)
 139                 return -EINVAL;
 140
 141         if (!(a.flags & MAP_ANONYMOUS)) {
 142                 error = -EBADF;
 143                 file = fget(a.fd);
 144                 if (!file)
 145                         goto out;
 146         }
 147         a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 148
 149         down_write(&current->mm->mmap_sem);
 150         error = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, pgoff);
 151         up_write(&current->mm->mmap_sem);
 152         if (file)
 153                 fput(file);
 154 out:
 155         return error;
 156 }
 157 #endif
 158
 159 struct sel_arg_struct {
 160         unsigned long n;
 161         fd_set *inp, *outp, *exp;
 162         struct timeval *tvp;
 163 };
 164
 165 asmlinkage int old_select(struct sel_arg_struct *arg)
 166 {
 167         struct sel_arg_struct a;
 168
 169         if (copy_from_user(&a, arg, sizeof(a)))
 170                 return -EFAULT;
 171         /* sys_select() does the appropriate kernel locking */
 172         return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
 173 }
 174
 175 /*
 176  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 177  *
 178  * This is really horribly ugly.
 179  */
 180 asmlinkage int sys_ipc (uint call, int first, int second,
 181                         int third, void *ptr, long fifth)
 182 {
 183         int version, ret;
 184
 185         version = call >> 16; /* hack for backward compatibility */
 186         call &= 0xffff;
 187
 188         if (call <= SEMCTL)
 189                 switch (call) {
 190                 case SEMOP:
 191                         return sys_semop (first, (struct sembuf *)ptr, second);
 192                 case SEMGET:
 193                         return sys_semget (first, second, third);
 194                 case SEMCTL: {
 195                         union semun fourth;
 196                         if (!ptr)
 197                                 return -EINVAL;
 198                         if (get_user(fourth.__pad, (void **) ptr))
 199                                 return -EFAULT;
 200                         return sys_semctl (first, second, third, fourth);
 201                         }
 202                 default:
 203                         return -EINVAL;
 204                 }
 205         if (call <= MSGCTL)
 206                 switch (call) {
 207                 case MSGSND:
 208                         return sys_msgsnd (first, (struct msgbuf *) ptr,
 209                                           second, third);
 210                 case MSGRCV:
 211                         switch (version) {
 212                         case 0: {
 213                                 struct ipc_kludge tmp;
 214                                 if (!ptr)
 215                                         return -EINVAL;
 216                                 if (copy_from_user (&tmp,
 217                                                     (struct ipc_kludge *)ptr,
 218                                                     sizeof (tmp)))
 219                                         return -EFAULT;
 220                                 return sys_msgrcv (first, tmp.msgp, second,
 221                                                    tmp.msgtyp, third);
 222                                 }
 223                         default:
 224                                 return sys_msgrcv (first,
 225                                                    (struct msgbuf *) ptr,
 226                                                    second, fifth, third);
 227                         }
 228                 case MSGGET:
 229                         return sys_msgget ((key_t) first, second);
 230                 case MSGCTL:
 231                         return sys_msgctl (first, second,
 232                                            (struct msqid_ds *) ptr);
 233                 default:
 234                         return -EINVAL;
 235                 }
 236         if (call <= SHMCTL)
 237                 switch (call) {
 238                 case SHMAT:
 239                         switch (version) {
 240                         default: {
 241                                 ulong raddr;
 242                                 ret = do_shmat (first, (char *) ptr,
 243                                                  second, &raddr);
 244                                 if (ret)
 245                                         return ret;
 246                                 return put_user (raddr, (ulong *) third);
 247                         }
 248                         }
 249                 case SHMDT:
 250                         return sys_shmdt ((char *)ptr);
 251                 case SHMGET:
 252                         return sys_shmget (first, second, third);
 253                 case SHMCTL:
 254                         return sys_shmctl (first, second,
 255                                            (struct shmid_ds *) ptr);
 256                 default:
 257                         return -EINVAL;
 258                 }
 259
 260         return -EINVAL;
 261 }
 262
 263 /* sys_cacheflush -- no support.  */
 264 asmlinkage int
 265 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
 266 {
 267         return -EINVAL;
 268 }
 269
 270 asmlinkage int sys_getpagesize(void)
 271 {
 272         return PAGE_SIZE;
 273 }
 274
 275 #if defined(CONFIG_SYSCALL_PRINT)
 276 asmlinkage void syscall_print(void *dummy,...)
 277 {
 278         struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4);
 279         printk("call %06lx:%ld 1:%08lx,2:%08lx,3:%08lx,ret:%08lx\n",
 280                ((regs->pc)&0xffffff)-2,regs->orig_er0,regs->er1,regs->er2,regs->er3,regs->er0);
 281 }
 282 #endif