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/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/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 #if 0 /* DAVIDM - do we want this */
 116 struct mmap_arg_struct64 {
 117         __u32 addr;
 118         __u32 len;
 119         __u32 prot;
 120         __u32 flags;
 121         __u64 offset; /* 64 bits */
 122         __u32 fd;
 123 };
 124
 125 asmlinkage long sys_mmap64(struct mmap_arg_struct64 *arg)
 126 {
 127         int error = -EFAULT;
 128         struct file * file = NULL;
 129         struct mmap_arg_struct64 a;
 130         unsigned long pgoff;
 131
 132         if (copy_from_user(&a, arg, sizeof(a)))
 133                 return -EFAULT;
 134
 135         if ((long)a.offset & ~PAGE_MASK)
 136                 return -EINVAL;
 137
 138         pgoff = a.offset >> PAGE_SHIFT;
 139         if ((a.offset >> PAGE_SHIFT) != pgoff)
 140                 return -EINVAL;
 141
 142         if (!(a.flags & MAP_ANONYMOUS)) {
 143                 error = -EBADF;
 144                 file = fget(a.fd);
 145                 if (!file)
 146                         goto out;
 147         }
 148         a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 149
 150         down_write(&current->mm->mmap_sem);
 151         error = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, pgoff);
 152         up_write(&current->mm->mmap_sem);
 153         if (file)
 154                 fput(file);
 155 out:
 156         return error;
 157 }
 158 #endif
 159
 160 struct sel_arg_struct {
 161         unsigned long n;
 162         fd_set *inp, *outp, *exp;
 163         struct timeval *tvp;
 164 };
 165
 166 asmlinkage int old_select(struct sel_arg_struct *arg)
 167 {
 168         struct sel_arg_struct a;
 169
 170         if (copy_from_user(&a, arg, sizeof(a)))
 171                 return -EFAULT;
 172         /* sys_select() does the appropriate kernel locking */
 173         return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
 174 }
 175
 176 /*
 177  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 178  *
 179  * This is really horribly ugly.
 180  */
 181 asmlinkage int sys_ipc (uint call, int first, int second,
 182                         int third, void *ptr, long fifth)
 183 {
 184         int version, ret;
 185
 186         version = call >> 16; /* hack for backward compatibility */
 187         call &= 0xffff;
 188
 189         if (call <= SEMCTL)
 190                 switch (call) {
 191                 case SEMOP:
 192                         return sys_semop (first, (struct sembuf *)ptr, second);
 193                 case SEMGET:
 194                         return sys_semget (first, second, third);
 195                 case SEMCTL: {
 196                         union semun fourth;
 197                         if (!ptr)
 198                                 return -EINVAL;
 199                         if (get_user(fourth.__pad, (void **) ptr))
 200                                 return -EFAULT;
 201                         return sys_semctl (first, second, third, fourth);
 202                         }
 203                 default:
 204                         return -EINVAL;
 205                 }
 206         if (call <= MSGCTL)
 207                 switch (call) {
 208                 case MSGSND:
 209                         return sys_msgsnd (first, (struct msgbuf *) ptr,
 210                                           second, third);
 211                 case MSGRCV:
 212                         switch (version) {
 213                         case 0: {
 214                                 struct ipc_kludge tmp;
 215                                 if (!ptr)
 216                                         return -EINVAL;
 217                                 if (copy_from_user (&tmp,
 218                                                     (struct ipc_kludge *)ptr,
 219                                                     sizeof (tmp)))
 220                                         return -EFAULT;
 221                                 return sys_msgrcv (first, tmp.msgp, second,
 222                                                    tmp.msgtyp, third);
 223                                 }
 224                         default:
 225                                 return sys_msgrcv (first,
 226                                                    (struct msgbuf *) ptr,
 227                                                    second, fifth, third);
 228                         }
 229                 case MSGGET:
 230                         return sys_msgget ((key_t) first, second);
 231                 case MSGCTL:
 232                         return sys_msgctl (first, second,
 233                                            (struct msqid_ds *) ptr);
 234                 default:
 235                         return -EINVAL;
 236                 }
 237         if (call <= SHMCTL)
 238                 switch (call) {
 239                 case SHMAT:
 240                         switch (version) {
 241                         default: {
 242                                 ulong raddr;
 243                                 ret = do_shmat (first, (char *) ptr,
 244                                                  second, &raddr);
 245                                 if (ret)
 246                                         return ret;
 247                                 return put_user (raddr, (ulong *) third);
 248                         }
 249                         }
 250                 case SHMDT:
 251                         return sys_shmdt ((char *)ptr);
 252                 case SHMGET:
 253                         return sys_shmget (first, second, third);
 254                 case SHMCTL:
 255                         return sys_shmctl (first, second,
 256                                            (struct shmid_ds *) ptr);
 257                 default:
 258                         return -EINVAL;
 259                 }
 260
 261         return -EINVAL;
 262 }
 263
 264 /* sys_cacheflush -- no support.  */
 265 asmlinkage int
 266 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
 267 {
 268         return -EINVAL;
 269 }
 270
 271 asmlinkage int sys_getpagesize(void)
 272 {
 273         return PAGE_SIZE;
 274 }
 275
 276 #if defined(CONFIG_SYSCALL_PRINT)
 277 asmlinkage void syscall_print(void *dummy,...)
 278 {
 279         struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4);
 280         printk("call %06lx:%ld 1:%08lx,2:%08lx,3:%08lx,ret:%08lx\n",
 281                ((regs->pc)&0xffffff)-2,regs->orig_er0,regs->er1,regs->er2,regs->er3,regs->er0);
 282 }
 283 #endif
 284
 285 /*
 286  * Do a system call from kernel instead of calling sys_execve so we
 287  * end up with proper pt_regs.
 288  */
 289 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 290 {
 291         register long res __asm__("er0");
 292         register char *const *_c __asm__("er3") = envp;
 293         register char *const *_b __asm__("er2") = argv;
 294         register const char * _a __asm__("er1") = filename;
 295         __asm__ __volatile__ ("mov.l %1,er0\n\t"
 296                         "trapa  #0\n\t"
 297                         : "=r" (res)
 298                         : "g" (__NR_execve),
 299                           "g" (_a),
 300                           "g" (_b),
 301                           "g" (_c)
 302                         : "cc", "memory");
 303         return res;
 304 }
 305
 306