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/fs.h>
  21 #include <linux/ipc.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/unistd.h>
  28
  29 /* common code for old and new mmaps */
  30 static inline long do_mmap2(
  31         unsigned long addr, unsigned long len,
  32         unsigned long prot, unsigned long flags,
  33         unsigned long fd, unsigned long pgoff)
  34 {
  35         int error = -EBADF;
  36         struct file * file = NULL;
  37
  38         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  39         if (!(flags & MAP_ANONYMOUS)) {
  40                 file = fget(fd);
  41                 if (!file)
  42                         goto out;
  43         }
  44
  45         down_write(&current->mm->mmap_sem);
  46         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  47         up_write(&current->mm->mmap_sem);
  48
  49         if (file)
  50                 fput(file);
  51 out:
  52         return error;
  53 }
  54
  55 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
  56         unsigned long prot, unsigned long flags,
  57         unsigned long fd, unsigned long pgoff)
  58 {
  59         return do_mmap2(addr, len, prot, flags, fd, pgoff);
  60 }
  61
  62 /*
  63  * Perform the select(nd, in, out, ex, tv) and mmap() system
  64  * calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
  65  * handle more than 4 system call parameters, so these system calls
  66  * used a memory block for parameter passing..
  67  */
  68
  69 struct mmap_arg_struct {
  70         unsigned long addr;
  71         unsigned long len;
  72         unsigned long prot;
  73         unsigned long flags;
  74         unsigned long fd;
  75         unsigned long offset;
  76 };
  77
  78 asmlinkage int old_mmap(struct mmap_arg_struct *arg)
  79 {
  80         struct mmap_arg_struct a;
  81         int error = -EFAULT;
  82
  83         if (copy_from_user(&a, arg, sizeof(a)))
  84                 goto out;
  85
  86         error = -EINVAL;
  87         if (a.offset & ~PAGE_MASK)
  88                 goto out;
  89
  90         a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  91
  92         error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
  93 out:
  94         return error;
  95 }
  96
  97 #if 0 /* DAVIDM - do we want this */
  98 struct mmap_arg_struct64 {
  99         __u32 addr;
 100         __u32 len;
 101         __u32 prot;
 102         __u32 flags;
 103         __u64 offset; /* 64 bits */
 104         __u32 fd;
 105 };
 106
 107 asmlinkage long sys_mmap64(struct mmap_arg_struct64 *arg)
 108 {
 109         int error = -EFAULT;
 110         struct file * file = NULL;
 111         struct mmap_arg_struct64 a;
 112         unsigned long pgoff;
 113
 114         if (copy_from_user(&a, arg, sizeof(a)))
 115                 return -EFAULT;
 116
 117         if ((long)a.offset & ~PAGE_MASK)
 118                 return -EINVAL;
 119
 120         pgoff = a.offset >> PAGE_SHIFT;
 121         if ((a.offset >> PAGE_SHIFT) != pgoff)
 122                 return -EINVAL;
 123
 124         if (!(a.flags & MAP_ANONYMOUS)) {
 125                 error = -EBADF;
 126                 file = fget(a.fd);
 127                 if (!file)
 128                         goto out;
 129         }
 130         a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 131
 132         down_write(&current->mm->mmap_sem);
 133         error = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, pgoff);
 134         up_write(&current->mm->mmap_sem);
 135         if (file)
 136                 fput(file);
 137 out:
 138         return error;
 139 }
 140 #endif
 141
 142 struct sel_arg_struct {
 143         unsigned long n;
 144         fd_set *inp, *outp, *exp;
 145         struct timeval *tvp;
 146 };
 147
 148 asmlinkage int old_select(struct sel_arg_struct *arg)
 149 {
 150         struct sel_arg_struct a;
 151
 152         if (copy_from_user(&a, arg, sizeof(a)))
 153                 return -EFAULT;
 154         /* sys_select() does the appropriate kernel locking */
 155         return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
 156 }
 157
 158 /*
 159  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 160  *
 161  * This is really horribly ugly.
 162  */
 163 asmlinkage int sys_ipc (uint call, int first, int second,
 164                         int third, void *ptr, long fifth)
 165 {
 166         int version, ret;
 167
 168         version = call >> 16; /* hack for backward compatibility */
 169         call &= 0xffff;
 170
 171         if (call <= SEMCTL)
 172                 switch (call) {
 173                 case SEMOP:
 174                         return sys_semop (first, (struct sembuf *)ptr, second);
 175                 case SEMGET:
 176                         return sys_semget (first, second, third);
 177                 case SEMCTL: {
 178                         union semun fourth;
 179                         if (!ptr)
 180                                 return -EINVAL;
 181                         if (get_user(fourth.__pad, (void **) ptr))
 182                                 return -EFAULT;
 183                         return sys_semctl (first, second, third, fourth);
 184                         }
 185                 default:
 186                         return -EINVAL;
 187                 }
 188         if (call <= MSGCTL)
 189                 switch (call) {
 190                 case MSGSND:
 191                         return sys_msgsnd (first, (struct msgbuf *) ptr,
 192                                           second, third);
 193                 case MSGRCV:
 194                         switch (version) {
 195                         case 0: {
 196                                 struct ipc_kludge tmp;
 197                                 if (!ptr)
 198                                         return -EINVAL;
 199                                 if (copy_from_user (&tmp,
 200                                                     (struct ipc_kludge *)ptr,
 201                                                     sizeof (tmp)))
 202                                         return -EFAULT;
 203                                 return sys_msgrcv (first, tmp.msgp, second,
 204                                                    tmp.msgtyp, third);
 205                                 }
 206                         default:
 207                                 return sys_msgrcv (first,
 208                                                    (struct msgbuf *) ptr,
 209                                                    second, fifth, third);
 210                         }
 211                 case MSGGET:
 212                         return sys_msgget ((key_t) first, second);
 213                 case MSGCTL:
 214                         return sys_msgctl (first, second,
 215                                            (struct msqid_ds *) ptr);
 216                 default:
 217                         return -EINVAL;
 218                 }
 219         if (call <= SHMCTL)
 220                 switch (call) {
 221                 case SHMAT:
 222                         switch (version) {
 223                         default: {
 224                                 ulong raddr;
 225                                 ret = do_shmat (first, (char *) ptr,
 226                                                  second, &raddr);
 227                                 if (ret)
 228                                         return ret;
 229                                 return put_user (raddr, (ulong *) third);
 230                         }
 231                         }
 232                 case SHMDT:
 233                         return sys_shmdt ((char *)ptr);
 234                 case SHMGET:
 235                         return sys_shmget (first, second, third);
 236                 case SHMCTL:
 237                         return sys_shmctl (first, second,
 238                                            (struct shmid_ds *) ptr);
 239                 default:
 240                         return -EINVAL;
 241                 }
 242
 243         return -EINVAL;
 244 }
 245
 246 /* sys_cacheflush -- no support.  */
 247 asmlinkage int
 248 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
 249 {
 250         return -EINVAL;
 251 }
 252
 253 asmlinkage int sys_getpagesize(void)
 254 {
 255         return PAGE_SIZE;
 256 }
 257
 258 #if defined(CONFIG_SYSCALL_PRINT)
 259 asmlinkage void syscall_print(void *dummy,...)
 260 {
 261         struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4);
 262         printk("call %06lx:%ld 1:%08lx,2:%08lx,3:%08lx,ret:%08lx\n",
 263                ((regs->pc)&0xffffff)-2,regs->orig_er0,regs->er1,regs->er2,regs->er3,regs->er0);
 264 }
 265 #endif
 266
 267 /*
 268  * Do a system call from kernel instead of calling sys_execve so we
 269  * end up with proper pt_regs.
 270  */
 271 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 272 {
 273         register long res __asm__("er0");
 274         register char *const *_c __asm__("er3") = envp;
 275         register char *const *_b __asm__("er2") = argv;
 276         register const char * _a __asm__("er1") = filename;
 277         __asm__ __volatile__ ("mov.l %1,er0\n\t"
 278                         "trapa  #0\n\t"
 279                         : "=r" (res)
 280                         : "g" (__NR_execve),
 281                           "g" (_a),
 282                           "g" (_b),
 283                           "g" (_c)
 284                         : "cc", "memory");
 285         return res;
 286 }
 287
 288