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 <asm/cacheflush.h>
  25 #include <asm/uaccess.h>
  26 #include <asm/ipc.h>
  27
  28 /*
  29  * sys_pipe() is the normal C calling standard for creating
  30  * a pipe. It's not the way Unix traditionally does this, though.
  31  */
  32 asmlinkage int sys_pipe(unsigned long r4, unsigned long r5,
  33         unsigned long r6, unsigned long r7,
  34         struct pt_regs regs)
  35 {
  36         int fd[2];
  37         int error;
  38
  39         error = do_pipe(fd);
  40         if (!error) {
  41                 regs.regs[1] = fd[1];
  42                 return fd[0];
  43         }
  44         return error;
  45 }
  46
  47 #if defined(HAVE_ARCH_UNMAPPED_AREA) && defined(CONFIG_MMU)
  48 /*
  49  * To avoid cache alias, we map the shard page with same color.
  50  */
  51 #define COLOUR_ALIGN(addr)      (((addr)+SHMLBA-1)&~(SHMLBA-1))
  52
  53 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
  54         unsigned long len, unsigned long pgoff, unsigned long flags)
  55 {
  56         struct mm_struct *mm = current->mm;
  57         struct vm_area_struct *vma;
  58         unsigned long start_addr;
  59
  60         if (flags & MAP_FIXED) {
  61                 /* We do not accept a shared mapping if it would violate
  62                  * cache aliasing constraints.
  63                  */
  64                 if ((flags & MAP_SHARED) && (addr & (SHMLBA - 1)))
  65                         return -EINVAL;
  66                 return addr;
  67         }
  68
  69         if (len > TASK_SIZE)
  70                 return -ENOMEM;
  71
  72         if (addr) {
  73                 if (flags & MAP_PRIVATE)
  74                         addr = PAGE_ALIGN(addr);
  75                 else
  76                         addr = COLOUR_ALIGN(addr);
  77                 vma = find_vma(mm, addr);
  78                 if (TASK_SIZE - len >= addr &&
  79                     (!vma || addr + len <= vma->vm_start))
  80                         return addr;
  81         }
  82         if (len <= mm->cached_hole_size) {
  83                 mm->cached_hole_size = 0;
  84                 mm->free_area_cache = TASK_UNMAPPED_BASE;
  85         }
  86         if (flags & MAP_PRIVATE)
  87                 addr = PAGE_ALIGN(mm->free_area_cache);
  88         else
  89                 addr = COLOUR_ALIGN(mm->free_area_cache);
  90         start_addr = addr;
  91
  92 full_search:
  93         for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
  94                 /* At this point:  (!vma || addr < vma->vm_end). */
  95                 if (TASK_SIZE - len < addr) {
  96                         /*
  97                          * Start a new search - just in case we missed
  98                          * some holes.
  99                          */
 100                         if (start_addr != TASK_UNMAPPED_BASE) {
 101                                 start_addr = addr = TASK_UNMAPPED_BASE;
 102                                 mm->cached_hole_size = 0;
 103                                 goto full_search;
 104                         }
 105                         return -ENOMEM;
 106                 }
 107                 if (!vma || addr + len <= vma->vm_start) {
 108                         /*
 109                          * Remember the place where we stopped the search:
 110                          */
 111                         mm->free_area_cache = addr + len;
 112                         return addr;
 113                 }
 114                 if (addr + mm->cached_hole_size < vma->vm_start)
 115                         mm->cached_hole_size = vma->vm_start - addr;
 116
 117                 addr = vma->vm_end;
 118                 if (!(flags & MAP_PRIVATE))
 119                         addr = COLOUR_ALIGN(addr);
 120         }
 121 }
 122 #endif
 123
 124 static inline long
 125 do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
 126          unsigned long flags, int fd, unsigned long pgoff)
 127 {
 128         int error = -EBADF;
 129         struct file *file = NULL;
 130
 131         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 132         if (!(flags & MAP_ANONYMOUS)) {
 133                 file = fget(fd);
 134                 if (!file)
 135                         goto out;
 136         }
 137
 138         down_write(&current->mm->mmap_sem);
 139         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 140         up_write(&current->mm->mmap_sem);
 141
 142         if (file)
 143                 fput(file);
 144 out:
 145         return error;
 146 }
 147
 148 asmlinkage int old_mmap(unsigned long addr, unsigned long len,
 149         unsigned long prot, unsigned long flags,
 150         int fd, unsigned long off)
 151 {
 152         if (off & ~PAGE_MASK)
 153                 return -EINVAL;
 154         return do_mmap2(addr, len, prot, flags, fd, off>>PAGE_SHIFT);
 155 }
 156
 157 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
 158         unsigned long prot, unsigned long flags,
 159         unsigned long fd, unsigned long pgoff)
 160 {
 161         return do_mmap2(addr, len, prot, flags, fd, pgoff);
 162 }
 163
 164 /*
 165  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 166  *
 167  * This is really horribly ugly.
 168  */
 169 asmlinkage int sys_ipc(uint call, int first, int second,
 170                        int third, void __user *ptr, long fifth)
 171 {
 172         int version, ret;
 173
 174         version = call >> 16; /* hack for backward compatibility */
 175         call &= 0xffff;
 176
 177         if (call <= SEMCTL)
 178                 switch (call) {
 179                 case SEMOP:
 180                         return sys_semtimedop(first, (struct sembuf __user *)ptr,
 181                                               second, NULL);
 182                 case SEMTIMEDOP:
 183                         return sys_semtimedop(first, (struct sembuf __user *)ptr,
 184                                               second,
 185                                               (const struct timespec __user *)fifth);
 186                 case SEMGET:
 187                         return sys_semget (first, second, third);
 188                 case SEMCTL: {
 189                         union semun fourth;
 190                         if (!ptr)
 191                                 return -EINVAL;
 192                         if (get_user(fourth.__pad, (void * __user *) ptr))
 193                                 return -EFAULT;
 194                         return sys_semctl (first, second, third, fourth);
 195                         }
 196                 default:
 197                         return -EINVAL;
 198                 }
 199
 200         if (call <= MSGCTL)
 201                 switch (call) {
 202                 case MSGSND:
 203                         return sys_msgsnd (first, (struct msgbuf __user *) ptr,
 204                                           second, third);
 205                 case MSGRCV:
 206                         switch (version) {
 207                         case 0: {
 208                                 struct ipc_kludge tmp;
 209                                 if (!ptr)
 210                                         return -EINVAL;
 211
 212                                 if (copy_from_user(&tmp,
 213                                                    (struct ipc_kludge __user *) ptr,
 214                                                    sizeof (tmp)))
 215                                         return -EFAULT;
 216                                 return sys_msgrcv (first, tmp.msgp, second,
 217                                                    tmp.msgtyp, third);
 218                                 }
 219                         default:
 220                                 return sys_msgrcv (first,
 221                                                    (struct msgbuf __user *) ptr,
 222                                                    second, fifth, third);
 223                         }
 224                 case MSGGET:
 225                         return sys_msgget ((key_t) first, second);
 226                 case MSGCTL:
 227                         return sys_msgctl (first, second,
 228                                            (struct msqid_ds __user *) ptr);
 229                 default:
 230                         return -EINVAL;
 231                 }
 232         if (call <= SHMCTL)
 233                 switch (call) {
 234                 case SHMAT:
 235                         switch (version) {
 236                         default: {
 237                                 ulong raddr;
 238                                 ret = do_shmat (first, (char __user *) ptr,
 239                                                  second, &raddr);
 240                                 if (ret)
 241                                         return ret;
 242                                 return put_user (raddr, (ulong __user *) third);
 243                         }
 244                         case 1: /* iBCS2 emulator entry point */
 245                                 if (!segment_eq(get_fs(), get_ds()))
 246                                         return -EINVAL;
 247                                 return do_shmat (first, (char __user *) ptr,
 248                                                   second, (ulong *) third);
 249                         }
 250                 case SHMDT:
 251                         return sys_shmdt ((char __user *)ptr);
 252                 case SHMGET:
 253                         return sys_shmget (first, second, third);
 254                 case SHMCTL:
 255                         return sys_shmctl (first, second,
 256                                            (struct shmid_ds __user *) ptr);
 257                 default:
 258                         return -EINVAL;
 259                 }
 260
 261         return -EINVAL;
 262 }
 263
 264 asmlinkage int sys_uname(struct old_utsname * name)
 265 {
 266         int err;
 267         if (!name)
 268                 return -EFAULT;
 269         down_read(&uts_sem);
 270         err=copy_to_user(name, &system_utsname, sizeof (*name));
 271         up_read(&uts_sem);
 272         return err?-EFAULT:0;
 273 }
 274
 275 asmlinkage ssize_t sys_pread_wrapper(unsigned int fd, char * buf,
 276                              size_t count, long dummy, loff_t pos)
 277 {
 278         return sys_pread64(fd, buf, count, pos);
 279 }
 280
 281 asmlinkage ssize_t sys_pwrite_wrapper(unsigned int fd, const char * buf,
 282                               size_t count, long dummy, loff_t pos)
 283 {
 284         return sys_pwrite64(fd, buf, count, pos);
 285 }
 286
 287 asmlinkage int sys_fadvise64_64_wrapper(int fd, u32 offset0, u32 offset1,
 288                                 u32 len0, u32 len1, int advice)
 289 {
 290 #ifdef  __LITTLE_ENDIAN__
 291         return sys_fadvise64_64(fd, (u64)offset1 << 32 | offset0,
 292                                 (u64)len1 << 32 | len0, advice);
 293 #else
 294         return sys_fadvise64_64(fd, (u64)offset0 << 32 | offset1,
 295                                 (u64)len0 << 32 | len1, advice);
 296 #endif
 297 }