arch/sh/kernel/sys_sh.c

   1 /*
   2  * linux/arch/sh/kernel/sys_sh.c
   3  *
   4  * This file contains various random system calls that
   5  * have a non-standard calling sequence on the Linux/SuperH
   6  * platform.
   7  *
   8  * Taken from i386 version.
   9  */
  10
  11 #include <linux/errno.h>
  12 #include <linux/sched.h>
  13 #include <linux/mm.h>
  14 #include <linux/smp.h>
  15 #include <linux/smp_lock.h>
  16 #include <linux/sem.h>
  17 #include <linux/msg.h>
  18 #include <linux/shm.h>
  19 #include <linux/stat.h>
  20 #include <linux/syscalls.h>
  21 #include <linux/mman.h>
  22 #include <linux/file.h>
  23 #include <linux/utsname.h>
  24 #include <linux/vs_cvirt.h>
  25
  26 #include <asm/uaccess.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 r4, unsigned long r5,
  34         unsigned long r6, unsigned long r7,
  35         struct pt_regs regs)
  36 {
  37         int fd[2];
  38         int error;
  39
  40         error = do_pipe(fd);
  41         if (!error) {
  42                 regs.regs[1] = fd[1];
  43                 return fd[0];
  44         }
  45         return error;
  46 }
  47
  48 #if defined(HAVE_ARCH_UNMAPPED_AREA)
  49 /*
  50  * To avoid cache alias, we map the shard page with same color.
  51  */
  52 #define COLOUR_ALIGN(addr)      (((addr)+SHMLBA-1)&~(SHMLBA-1))
  53
  54 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
  55         unsigned long len, unsigned long pgoff, unsigned long flags)
  56 {
  57         struct mm_struct *mm = current->mm;
  58         struct vm_area_struct *vma;
  59         unsigned long start_addr;
  60
  61         if (flags & MAP_FIXED) {
  62                 /* We do not accept a shared mapping if it would violate
  63                  * cache aliasing constraints.
  64                  */
  65                 if ((flags & MAP_SHARED) && (addr & (SHMLBA - 1)))
  66                         return -EINVAL;
  67                 return addr;
  68         }
  69
  70         if (len > TASK_SIZE)
  71                 return -ENOMEM;
  72
  73         if (addr) {
  74                 if (flags & MAP_PRIVATE)
  75                         addr = PAGE_ALIGN(addr);
  76                 else
  77                         addr = COLOUR_ALIGN(addr);
  78                 vma = find_vma(mm, addr);
  79                 if (TASK_SIZE - len >= addr &&
  80                     (!vma || addr + len <= vma->vm_start))
  81                         return addr;
  82         }
  83         if (len <= mm->cached_hole_size) {
  84                 mm->cached_hole_size = 0;
  85                 mm->free_area_cache = TASK_UNMAPPED_BASE;
  86         }
  87         if (flags & MAP_PRIVATE)
  88                 addr = PAGE_ALIGN(mm->free_area_cache);
  89         else
  90                 addr = COLOUR_ALIGN(mm->free_area_cache);
  91         start_addr = addr;
  92
  93 full_search:
  94         for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
  95                 /* At this point:  (!vma || addr < vma->vm_end). */
  96                 if (TASK_SIZE - len < addr) {
  97                         /*
  98                          * Start a new search - just in case we missed
  99                          * some holes.
 100                          */
 101                         if (start_addr != TASK_UNMAPPED_BASE) {
 102                                 start_addr = addr = TASK_UNMAPPED_BASE;
 103                                 mm->cached_hole_size = 0;
 104                                 goto full_search;
 105                         }
 106                         return -ENOMEM;
 107                 }
 108                 if (!vma || addr + len <= vma->vm_start) {
 109                         /*
 110                          * Remember the place where we stopped the search:
 111                          */
 112                         mm->free_area_cache = addr + len;
 113                         return addr;
 114                 }
 115                 if (addr + mm->cached_hole_size < vma->vm_start)
 116                         mm->cached_hole_size = vma->vm_start - addr;
 117
 118                 addr = vma->vm_end;
 119                 if (!(flags & MAP_PRIVATE))
 120                         addr = COLOUR_ALIGN(addr);
 121         }
 122 }
 123 #endif
 124
 125 static inline long
 126 do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
 127          unsigned long flags, int fd, unsigned long pgoff)
 128 {
 129         int error = -EBADF;
 130         struct file *file = NULL;
 131
 132         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 133         if (!(flags & MAP_ANONYMOUS)) {
 134                 file = fget(fd);
 135                 if (!file)
 136                         goto out;
 137         }
 138
 139         down_write(&current->mm->mmap_sem);
 140         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 141         up_write(&current->mm->mmap_sem);
 142
 143         if (file)
 144                 fput(file);
 145 out:
 146         return error;
 147 }
 148
 149 asmlinkage int old_mmap(unsigned long addr, unsigned long len,
 150         unsigned long prot, unsigned long flags,
 151         int fd, unsigned long off)
 152 {
 153         if (off & ~PAGE_MASK)
 154                 return -EINVAL;
 155         return do_mmap2(addr, len, prot, flags, fd, off>>PAGE_SHIFT);
 156 }
 157
 158 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
 159         unsigned long prot, unsigned long flags,
 160         unsigned long fd, unsigned long pgoff)
 161 {
 162         return do_mmap2(addr, len, prot, flags, fd, pgoff);
 163 }
 164
 165 /*
 166  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 167  *
 168  * This is really horribly ugly.
 169  */
 170 asmlinkage int sys_ipc(uint call, int first, int second,
 171                        int third, void __user *ptr, long fifth)
 172 {
 173         int version, ret;
 174
 175         version = call >> 16; /* hack for backward compatibility */
 176         call &= 0xffff;
 177
 178         if (call <= SEMCTL)
 179                 switch (call) {
 180                 case SEMOP:
 181                         return sys_semtimedop(first, (struct sembuf __user *)ptr,
 182                                               second, NULL);
 183                 case SEMTIMEDOP:
 184                         return sys_semtimedop(first, (struct sembuf __user *)ptr,
 185                                               second,
 186                                               (const struct timespec __user *)fifth);
 187                 case SEMGET:
 188                         return sys_semget (first, second, third);
 189                 case SEMCTL: {
 190                         union semun fourth;
 191                         if (!ptr)
 192                                 return -EINVAL;
 193                         if (get_user(fourth.__pad, (void * __user *) ptr))
 194                                 return -EFAULT;
 195                         return sys_semctl (first, second, third, fourth);
 196                         }
 197                 default:
 198                         return -EINVAL;
 199                 }
 200
 201         if (call <= MSGCTL)
 202                 switch (call) {
 203                 case MSGSND:
 204                         return sys_msgsnd (first, (struct msgbuf __user *) ptr,
 205                                           second, third);
 206                 case MSGRCV:
 207                         switch (version) {
 208                         case 0: {
 209                                 struct ipc_kludge tmp;
 210                                 if (!ptr)
 211                                         return -EINVAL;
 212
 213                                 if (copy_from_user(&tmp,
 214                                                    (struct ipc_kludge __user *) ptr,
 215                                                    sizeof (tmp)))
 216                                         return -EFAULT;
 217                                 return sys_msgrcv (first, tmp.msgp, second,
 218                                                    tmp.msgtyp, third);
 219                                 }
 220                         default:
 221                                 return sys_msgrcv (first,
 222                                                    (struct msgbuf __user *) ptr,
 223                                                    second, fifth, third);
 224                         }
 225                 case MSGGET:
 226                         return sys_msgget ((key_t) first, second);
 227                 case MSGCTL:
 228                         return sys_msgctl (first, second,
 229                                            (struct msqid_ds __user *) ptr);
 230                 default:
 231                         return -EINVAL;
 232                 }
 233         if (call <= SHMCTL)
 234                 switch (call) {
 235                 case SHMAT:
 236                         switch (version) {
 237                         default: {
 238                                 ulong raddr;
 239                                 ret = do_shmat (first, (char __user *) ptr,
 240                                                  second, &raddr);
 241                                 if (ret)
 242                                         return ret;
 243                                 return put_user (raddr, (ulong __user *) third);
 244                         }
 245                         case 1: /* iBCS2 emulator entry point */
 246                                 if (!segment_eq(get_fs(), get_ds()))
 247                                         return -EINVAL;
 248                                 return do_shmat (first, (char __user *) ptr,
 249                                                   second, (ulong *) third);
 250                         }
 251                 case SHMDT:
 252                         return sys_shmdt ((char __user *)ptr);
 253                 case SHMGET:
 254                         return sys_shmget (first, second, third);
 255                 case SHMCTL:
 256                         return sys_shmctl (first, second,
 257                                            (struct shmid_ds __user *) ptr);
 258                 default:
 259                         return -EINVAL;
 260                 }
 261
 262         return -EINVAL;
 263 }
 264
 265 asmlinkage int sys_uname(struct old_utsname * name)
 266 {
 267         int err;
 268         if (!name)
 269                 return -EFAULT;
 270         down_read(&uts_sem);
 271         err=copy_to_user(name, vx_new_utsname(), sizeof (*name));
 272         up_read(&uts_sem);
 273         return err?-EFAULT:0;
 274 }
 275
 276 asmlinkage ssize_t sys_pread_wrapper(unsigned int fd, char * buf,
 277                              size_t count, long dummy, loff_t pos)
 278 {
 279         return sys_pread64(fd, buf, count, pos);
 280 }
 281
 282 asmlinkage ssize_t sys_pwrite_wrapper(unsigned int fd, const char * buf,
 283                               size_t count, long dummy, loff_t pos)
 284 {
 285         return sys_pwrite64(fd, buf, count, pos);
 286 }
 287
 288 asmlinkage int sys_fadvise64_64_wrapper(int fd, u32 offset0, u32 offset1,
 289                                 u32 len0, u32 len1, int advice)
 290 {
 291 #ifdef  __LITTLE_ENDIAN__
 292         return sys_fadvise64_64(fd, (u64)offset1 << 32 | offset0,
 293                                 (u64)len1 << 32 | len0, advice);
 294 #else
 295         return sys_fadvise64_64(fd, (u64)offset0 << 32 | offset1,
 296                                 (u64)len0 << 32 | len1, advice);
 297 #endif
 298 }