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 #include <linux/ipc.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/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 #if 0 /* DAVIDM - do we want this */
  99 struct mmap_arg_struct64 {
 100         __u32 addr;
 101         __u32 len;
 102         __u32 prot;
 103         __u32 flags;
 104         __u64 offset; /* 64 bits */
 105         __u32 fd;
 106 };
 107
 108 asmlinkage long sys_mmap64(struct mmap_arg_struct64 *arg)
 109 {
 110         int error = -EFAULT;
 111         struct file * file = NULL;
 112         struct mmap_arg_struct64 a;
 113         unsigned long pgoff;
 114
 115         if (copy_from_user(&a, arg, sizeof(a)))
 116                 return -EFAULT;
 117
 118         if ((long)a.offset & ~PAGE_MASK)
 119                 return -EINVAL;
 120
 121         pgoff = a.offset >> PAGE_SHIFT;
 122         if ((a.offset >> PAGE_SHIFT) != pgoff)
 123                 return -EINVAL;
 124
 125         if (!(a.flags & MAP_ANONYMOUS)) {
 126                 error = -EBADF;
 127                 file = fget(a.fd);
 128                 if (!file)
 129                         goto out;
 130         }
 131         a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 132
 133         down_write(&current->mm->mmap_sem);
 134         error = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, pgoff);
 135         up_write(&current->mm->mmap_sem);
 136         if (file)
 137                 fput(file);
 138 out:
 139         return error;
 140 }
 141 #endif
 142
 143 struct sel_arg_struct {
 144         unsigned long n;
 145         fd_set *inp, *outp, *exp;
 146         struct timeval *tvp;
 147 };
 148
 149 asmlinkage int old_select(struct sel_arg_struct *arg)
 150 {
 151         struct sel_arg_struct a;
 152
 153         if (copy_from_user(&a, arg, sizeof(a)))
 154                 return -EFAULT;
 155         /* sys_select() does the appropriate kernel locking */
 156         return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
 157 }
 158
 159 /*
 160  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 161  *
 162  * This is really horribly ugly.
 163  */
 164 asmlinkage int sys_ipc (uint call, int first, int second,
 165                         int third, void *ptr, long fifth)
 166 {
 167         int version, ret;
 168
 169         version = call >> 16; /* hack for backward compatibility */
 170         call &= 0xffff;
 171
 172         if (call <= SEMCTL)
 173                 switch (call) {
 174                 case SEMOP:
 175                         return sys_semop (first, (struct sembuf *)ptr, second);
 176                 case SEMGET:
 177                         return sys_semget (first, second, third);
 178                 case SEMCTL: {
 179                         union semun fourth;
 180                         if (!ptr)
 181                                 return -EINVAL;
 182                         if (get_user(fourth.__pad, (void **) ptr))
 183                                 return -EFAULT;
 184                         return sys_semctl (first, second, third, fourth);
 185                         }
 186                 default:
 187                         return -EINVAL;
 188                 }
 189         if (call <= MSGCTL)
 190                 switch (call) {
 191                 case MSGSND:
 192                         return sys_msgsnd (first, (struct msgbuf *) ptr,
 193                                           second, third);
 194                 case MSGRCV:
 195                         switch (version) {
 196                         case 0: {
 197                                 struct ipc_kludge tmp;
 198                                 if (!ptr)
 199                                         return -EINVAL;
 200                                 if (copy_from_user (&tmp,
 201                                                     (struct ipc_kludge *)ptr,
 202                                                     sizeof (tmp)))
 203                                         return -EFAULT;
 204                                 return sys_msgrcv (first, tmp.msgp, second,
 205                                                    tmp.msgtyp, third);
 206                                 }
 207                         default:
 208                                 return sys_msgrcv (first,
 209                                                    (struct msgbuf *) ptr,
 210                                                    second, fifth, third);
 211                         }
 212                 case MSGGET:
 213                         return sys_msgget ((key_t) first, second);
 214                 case MSGCTL:
 215                         return sys_msgctl (first, second,
 216                                            (struct msqid_ds *) ptr);
 217                 default:
 218                         return -EINVAL;
 219                 }
 220         if (call <= SHMCTL)
 221                 switch (call) {
 222                 case SHMAT:
 223                         switch (version) {
 224                         default: {
 225                                 ulong raddr;
 226                                 ret = do_shmat (first, (char *) ptr,
 227                                                  second, &raddr);
 228                                 if (ret)
 229                                         return ret;
 230                                 return put_user (raddr, (ulong *) third);
 231                         }
 232                         }
 233                 case SHMDT:
 234                         return sys_shmdt ((char *)ptr);
 235                 case SHMGET:
 236                         return sys_shmget (first, second, third);
 237                 case SHMCTL:
 238                         return sys_shmctl (first, second,
 239                                            (struct shmid_ds *) ptr);
 240                 default:
 241                         return -EINVAL;
 242                 }
 243
 244         return -EINVAL;
 245 }
 246
 247 /* sys_cacheflush -- no support.  */
 248 asmlinkage int
 249 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
 250 {
 251         return -EINVAL;
 252 }
 253
 254 asmlinkage int sys_getpagesize(void)
 255 {
 256         return PAGE_SIZE;
 257 }
 258
 259 #if defined(CONFIG_SYSCALL_PRINT)
 260 asmlinkage void syscall_print(void *dummy,...)
 261 {
 262         struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4);
 263         printk("call %06lx:%ld 1:%08lx,2:%08lx,3:%08lx,ret:%08lx\n",
 264                ((regs->pc)&0xffffff)-2,regs->orig_er0,regs->er1,regs->er2,regs->er3,regs->er0);
 265 }
 266 #endif
 267
 268 /*
 269  * Do a system call from kernel instead of calling sys_execve so we
 270  * end up with proper pt_regs.
 271  */
 272 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 273 {
 274         register long res __asm__("er0");
 275         register char *const *_c __asm__("er3") = envp;
 276         register char *const *_b __asm__("er2") = argv;
 277         register const char * _a __asm__("er1") = filename;
 278         __asm__ __volatile__ ("mov.l %1,er0\n\t"
 279                         "trapa  #0\n\t"
 280                         : "=r" (res)
 281                         : "g" (__NR_execve),
 282                           "g" (_a),
 283                           "g" (_b),
 284                           "g" (_c)
 285                         : "cc", "memory");
 286         return res;
 287 }
 288
 289