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
  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)
  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 (flags & MAP_PRIVATE)
  83                 addr = PAGE_ALIGN(mm->free_area_cache);
  84         else
  85                 addr = COLOUR_ALIGN(mm->free_area_cache);
  86         start_addr = addr;
  87
  88 full_search:
  89         for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
  90                 /* At this point:  (!vma || addr < vma->vm_end). */
  91                 if (TASK_SIZE - len < addr) {
  92                         /*
  93                          * Start a new search - just in case we missed
  94                          * some holes.
  95                          */
  96                         if (start_addr != TASK_UNMAPPED_BASE) {
  97                                 start_addr = addr = TASK_UNMAPPED_BASE;
  98                                 goto full_search;
  99                         }
 100                         return -ENOMEM;
 101                 }
 102                 if (!vma || addr + len <= vma->vm_start) {
 103                         /*
 104                          * Remember the place where we stopped the search:
 105                          */
 106                         mm->free_area_cache = addr + len;
 107                         return addr;
 108                 }
 109                 addr = vma->vm_end;
 110                 if (!(flags & MAP_PRIVATE))
 111                         addr = COLOUR_ALIGN(addr);
 112         }
 113 }
 114 #endif
 115
 116 static inline long
 117 do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
 118          unsigned long flags, int fd, unsigned long pgoff)
 119 {
 120         int error = -EBADF;
 121         struct file *file = NULL;
 122
 123         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 124         if (!(flags & MAP_ANONYMOUS)) {
 125                 file = fget(fd);
 126                 if (!file)
 127                         goto out;
 128         }
 129
 130         down_write(&current->mm->mmap_sem);
 131         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 132         up_write(&current->mm->mmap_sem);
 133
 134         if (file)
 135                 fput(file);
 136 out:
 137         return error;
 138 }
 139
 140 asmlinkage int old_mmap(unsigned long addr, unsigned long len,
 141         unsigned long prot, unsigned long flags,
 142         int fd, unsigned long off)
 143 {
 144         if (off & ~PAGE_MASK)
 145                 return -EINVAL;
 146         return do_mmap2(addr, len, prot, flags, fd, off>>PAGE_SHIFT);
 147 }
 148
 149 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
 150         unsigned long prot, unsigned long flags,
 151         unsigned long fd, unsigned long pgoff)
 152 {
 153         return do_mmap2(addr, len, prot, flags, fd, pgoff);
 154 }
 155
 156 /*
 157  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 158  *
 159  * This is really horribly ugly.
 160  */
 161 asmlinkage int sys_ipc(uint call, int first, int second,
 162                        int third, void __user *ptr, long fifth)
 163 {
 164         int version, ret;
 165
 166         version = call >> 16; /* hack for backward compatibility */
 167         call &= 0xffff;
 168
 169         if (call <= SEMCTL)
 170                 switch (call) {
 171                 case SEMOP:
 172                         return sys_semtimedop(first, (struct sembuf __user *)ptr,
 173                                               second, NULL);
 174                 case SEMTIMEDOP:
 175                         return sys_semtimedop(first, (struct sembuf __user *)ptr,
 176                                               second,
 177                                               (const struct timespec __user *)fifth);
 178                 case SEMGET:
 179                         return sys_semget (first, second, third);
 180                 case SEMCTL: {
 181                         union semun fourth;
 182                         if (!ptr)
 183                                 return -EINVAL;
 184                         if (get_user(fourth.__pad, (void * __user *) ptr))
 185                                 return -EFAULT;
 186                         return sys_semctl (first, second, third, fourth);
 187                         }
 188                 default:
 189                         return -EINVAL;
 190                 }
 191
 192         if (call <= MSGCTL)
 193                 switch (call) {
 194                 case MSGSND:
 195                         return sys_msgsnd (first, (struct msgbuf __user *) ptr,
 196                                           second, third);
 197                 case MSGRCV:
 198                         switch (version) {
 199                         case 0: {
 200                                 struct ipc_kludge tmp;
 201                                 if (!ptr)
 202                                         return -EINVAL;
 203
 204                                 if (copy_from_user(&tmp,
 205                                                    (struct ipc_kludge __user *) ptr,
 206                                                    sizeof (tmp)))
 207                                         return -EFAULT;
 208                                 return sys_msgrcv (first, tmp.msgp, second,
 209                                                    tmp.msgtyp, third);
 210                                 }
 211                         default:
 212                                 return sys_msgrcv (first,
 213                                                    (struct msgbuf __user *) ptr,
 214                                                    second, fifth, third);
 215                         }
 216                 case MSGGET:
 217                         return sys_msgget ((key_t) first, second);
 218                 case MSGCTL:
 219                         return sys_msgctl (first, second,
 220                                            (struct msqid_ds __user *) ptr);
 221                 default:
 222                         return -EINVAL;
 223                 }
 224         if (call <= SHMCTL)
 225                 switch (call) {
 226                 case SHMAT:
 227                         switch (version) {
 228                         default: {
 229                                 ulong raddr;
 230                                 ret = do_shmat (first, (char __user *) ptr,
 231                                                  second, &raddr);
 232                                 if (ret)
 233                                         return ret;
 234                                 return put_user (raddr, (ulong __user *) third);
 235                         }
 236                         case 1: /* iBCS2 emulator entry point */
 237                                 if (!segment_eq(get_fs(), get_ds()))
 238                                         return -EINVAL;
 239                                 return do_shmat (first, (char __user *) ptr,
 240                                                   second, (ulong *) third);
 241                         }
 242                 case SHMDT:
 243                         return sys_shmdt ((char __user *)ptr);
 244                 case SHMGET:
 245                         return sys_shmget (first, second, third);
 246                 case SHMCTL:
 247                         return sys_shmctl (first, second,
 248                                            (struct shmid_ds __user *) ptr);
 249                 default:
 250                         return -EINVAL;
 251                 }
 252
 253         return -EINVAL;
 254 }
 255
 256 asmlinkage int sys_uname(struct old_utsname * name)
 257 {
 258         int err;
 259         if (!name)
 260                 return -EFAULT;
 261         down_read(&uts_sem);
 262         err=copy_to_user(name, &system_utsname, sizeof (*name));
 263         up_read(&uts_sem);
 264         return err?-EFAULT:0;
 265 }
 266
 267 asmlinkage ssize_t sys_pread_wrapper(unsigned int fd, char * buf,
 268                              size_t count, long dummy, loff_t pos)
 269 {
 270         return sys_pread64(fd, buf, count, pos);
 271 }
 272
 273 asmlinkage ssize_t sys_pwrite_wrapper(unsigned int fd, const char * buf,
 274                               size_t count, long dummy, loff_t pos)
 275 {
 276         return sys_pwrite64(fd, buf, count, pos);
 277 }
 278
 279 asmlinkage int sys_fadvise64_64_wrapper(int fd, u32 offset0, u32 offset1,
 280                                 u32 len0, u32 len1, int advice)
 281 {
 282 #ifdef  __LITTLE_ENDIAN__
 283         return sys_fadvise64_64(fd, (u64)offset1 << 32 | offset0,
 284                                 (u64)len1 << 32 | len0, advice);
 285 #else
 286         return sys_fadvise64_64(fd, (u64)offset0 << 32 | offset1,
 287                                 (u64)len0 << 32 | len1, advice);
 288 #endif
 289 }