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/module.h>
  25 #include <asm/cacheflush.h>
  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 unsigned long shm_align_mask = PAGE_SIZE - 1;   /* Sane caches */
  49
  50 EXPORT_SYMBOL(shm_align_mask);
  51
  52 /*
  53  * To avoid cache aliases, we map the shared page with same color.
  54  */
  55 #define COLOUR_ALIGN(addr, pgoff)                               \
  56         ((((addr) + shm_align_mask) & ~shm_align_mask) +        \
  57          (((pgoff) << PAGE_SHIFT) & shm_align_mask))
  58
  59 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
  60         unsigned long len, unsigned long pgoff, unsigned long flags)
  61 {
  62         struct mm_struct *mm = current->mm;
  63         struct vm_area_struct *vma;
  64         unsigned long start_addr;
  65         int do_colour_align;
  66
  67         if (flags & MAP_FIXED) {
  68                 /* We do not accept a shared mapping if it would violate
  69                  * cache aliasing constraints.
  70                  */
  71                 if ((flags & MAP_SHARED) && (addr & shm_align_mask))
  72                         return -EINVAL;
  73                 return addr;
  74         }
  75
  76         if (unlikely(len > TASK_SIZE))
  77                 return -ENOMEM;
  78
  79         do_colour_align = 0;
  80         if (filp || (flags & MAP_SHARED))
  81                 do_colour_align = 1;
  82
  83         if (addr) {
  84                 if (do_colour_align)
  85                         addr = COLOUR_ALIGN(addr, pgoff);
  86                 else
  87                         addr = PAGE_ALIGN(addr);
  88
  89                 vma = find_vma(mm, addr);
  90                 if (TASK_SIZE - len >= addr &&
  91                     (!vma || addr + len <= vma->vm_start))
  92                         return addr;
  93         }
  94
  95         if (len > mm->cached_hole_size) {
  96                 start_addr = addr = mm->free_area_cache;
  97         } else {
  98                 mm->cached_hole_size = 0;
  99                 start_addr = addr = TASK_UNMAPPED_BASE;
 100         }
 101
 102 full_search:
 103         if (do_colour_align)
 104                 addr = COLOUR_ALIGN(addr, pgoff);
 105         else
 106                 addr = PAGE_ALIGN(mm->free_area_cache);
 107
 108         for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
 109                 /* At this point:  (!vma || addr < vma->vm_end). */
 110                 if (unlikely(TASK_SIZE - len < addr)) {
 111                         /*
 112                          * Start a new search - just in case we missed
 113                          * some holes.
 114                          */
 115                         if (start_addr != TASK_UNMAPPED_BASE) {
 116                                 start_addr = addr = TASK_UNMAPPED_BASE;
 117                                 mm->cached_hole_size = 0;
 118                                 goto full_search;
 119                         }
 120                         return -ENOMEM;
 121                 }
 122                 if (likely(!vma || addr + len <= vma->vm_start)) {
 123                         /*
 124                          * Remember the place where we stopped the search:
 125                          */
 126                         mm->free_area_cache = addr + len;
 127                         return addr;
 128                 }
 129                 if (addr + mm->cached_hole_size < vma->vm_start)
 130                         mm->cached_hole_size = vma->vm_start - addr;
 131
 132                 addr = vma->vm_end;
 133                 if (do_colour_align)
 134                         addr = COLOUR_ALIGN(addr, pgoff);
 135         }
 136 }
 137
 138 static inline long
 139 do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
 140          unsigned long flags, int fd, unsigned long pgoff)
 141 {
 142         int error = -EBADF;
 143         struct file *file = NULL;
 144
 145         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 146         if (!(flags & MAP_ANONYMOUS)) {
 147                 file = fget(fd);
 148                 if (!file)
 149                         goto out;
 150         }
 151
 152         down_write(&current->mm->mmap_sem);
 153         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 154         up_write(&current->mm->mmap_sem);
 155
 156         if (file)
 157                 fput(file);
 158 out:
 159         return error;
 160 }
 161
 162 asmlinkage int old_mmap(unsigned long addr, unsigned long len,
 163         unsigned long prot, unsigned long flags,
 164         int fd, unsigned long off)
 165 {
 166         if (off & ~PAGE_MASK)
 167                 return -EINVAL;
 168         return do_mmap2(addr, len, prot, flags, fd, off>>PAGE_SHIFT);
 169 }
 170
 171 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
 172         unsigned long prot, unsigned long flags,
 173         unsigned long fd, unsigned long pgoff)
 174 {
 175         return do_mmap2(addr, len, prot, flags, fd, pgoff);
 176 }
 177
 178 /*
 179  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 180  *
 181  * This is really horribly ugly.
 182  */
 183 asmlinkage int sys_ipc(uint call, int first, int second,
 184                        int third, void __user *ptr, long fifth)
 185 {
 186         int version, ret;
 187
 188         version = call >> 16; /* hack for backward compatibility */
 189         call &= 0xffff;
 190
 191         if (call <= SEMCTL)
 192                 switch (call) {
 193                 case SEMOP:
 194                         return sys_semtimedop(first, (struct sembuf __user *)ptr,
 195                                               second, NULL);
 196                 case SEMTIMEDOP:
 197                         return sys_semtimedop(first, (struct sembuf __user *)ptr,
 198                                               second,
 199                                               (const struct timespec __user *)fifth);
 200                 case SEMGET:
 201                         return sys_semget (first, second, third);
 202                 case SEMCTL: {
 203                         union semun fourth;
 204                         if (!ptr)
 205                                 return -EINVAL;
 206                         if (get_user(fourth.__pad, (void * __user *) ptr))
 207                                 return -EFAULT;
 208                         return sys_semctl (first, second, third, fourth);
 209                         }
 210                 default:
 211                         return -EINVAL;
 212                 }
 213
 214         if (call <= MSGCTL)
 215                 switch (call) {
 216                 case MSGSND:
 217                         return sys_msgsnd (first, (struct msgbuf __user *) ptr,
 218                                           second, third);
 219                 case MSGRCV:
 220                         switch (version) {
 221                         case 0: {
 222                                 struct ipc_kludge tmp;
 223                                 if (!ptr)
 224                                         return -EINVAL;
 225
 226                                 if (copy_from_user(&tmp,
 227                                                    (struct ipc_kludge __user *) ptr,
 228                                                    sizeof (tmp)))
 229                                         return -EFAULT;
 230                                 return sys_msgrcv (first, tmp.msgp, second,
 231                                                    tmp.msgtyp, third);
 232                                 }
 233                         default:
 234                                 return sys_msgrcv (first,
 235                                                    (struct msgbuf __user *) ptr,
 236                                                    second, fifth, third);
 237                         }
 238                 case MSGGET:
 239                         return sys_msgget ((key_t) first, second);
 240                 case MSGCTL:
 241                         return sys_msgctl (first, second,
 242                                            (struct msqid_ds __user *) ptr);
 243                 default:
 244                         return -EINVAL;
 245                 }
 246         if (call <= SHMCTL)
 247                 switch (call) {
 248                 case SHMAT:
 249                         switch (version) {
 250                         default: {
 251                                 ulong raddr;
 252                                 ret = do_shmat (first, (char __user *) ptr,
 253                                                  second, &raddr);
 254                                 if (ret)
 255                                         return ret;
 256                                 return put_user (raddr, (ulong __user *) third);
 257                         }
 258                         case 1: /* iBCS2 emulator entry point */
 259                                 if (!segment_eq(get_fs(), get_ds()))
 260                                         return -EINVAL;
 261                                 return do_shmat (first, (char __user *) ptr,
 262                                                   second, (ulong *) third);
 263                         }
 264                 case SHMDT:
 265                         return sys_shmdt ((char __user *)ptr);
 266                 case SHMGET:
 267                         return sys_shmget (first, second, third);
 268                 case SHMCTL:
 269                         return sys_shmctl (first, second,
 270                                            (struct shmid_ds __user *) ptr);
 271                 default:
 272                         return -EINVAL;
 273                 }
 274
 275         return -EINVAL;
 276 }
 277
 278 asmlinkage int sys_uname(struct old_utsname * name)
 279 {
 280         int err;
 281         if (!name)
 282                 return -EFAULT;
 283         down_read(&uts_sem);
 284         err=copy_to_user(name, &system_utsname, sizeof (*name));
 285         up_read(&uts_sem);
 286         return err?-EFAULT:0;
 287 }
 288
 289 asmlinkage ssize_t sys_pread_wrapper(unsigned int fd, char * buf,
 290                              size_t count, long dummy, loff_t pos)
 291 {
 292         return sys_pread64(fd, buf, count, pos);
 293 }
 294
 295 asmlinkage ssize_t sys_pwrite_wrapper(unsigned int fd, const char * buf,
 296                               size_t count, long dummy, loff_t pos)
 297 {
 298         return sys_pwrite64(fd, buf, count, pos);
 299 }
 300
 301 asmlinkage int sys_fadvise64_64_wrapper(int fd, u32 offset0, u32 offset1,
 302                                 u32 len0, u32 len1, int advice)
 303 {
 304 #ifdef  __LITTLE_ENDIAN__
 305         return sys_fadvise64_64(fd, (u64)offset1 << 32 | offset0,
 306                                 (u64)len1 << 32 | len0, advice);
 307 #else
 308         return sys_fadvise64_64(fd, (u64)offset0 << 32 | offset1,
 309                                 (u64)len0 << 32 | len1, advice);
 310 #endif
 311 }