arch/mips/kernel/syscall.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1995, 1996, 1997, 2000, 2001, 05 by Ralf Baechle
   7  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
   8  * Copyright (C) 2001 MIPS Technologies, Inc.
   9  */
  10 #include <linux/a.out.h>
  11 #include <linux/errno.h>
  12 #include <linux/linkage.h>
  13 #include <linux/mm.h>
  14 #include <linux/smp.h>
  15 #include <linux/smp_lock.h>
  16 #include <linux/mman.h>
  17 #include <linux/ptrace.h>
  18 #include <linux/sched.h>
  19 #include <linux/string.h>
  20 #include <linux/syscalls.h>
  21 #include <linux/file.h>
  22 #include <linux/slab.h>
  23 #include <linux/utsname.h>
  24 #include <linux/unistd.h>
  25 #include <linux/sem.h>
  26 #include <linux/msg.h>
  27 #include <linux/shm.h>
  28 #include <linux/compiler.h>
  29
  30 #include <asm/branch.h>
  31 #include <asm/cachectl.h>
  32 #include <asm/cacheflush.h>
  33 #include <asm/ipc.h>
  34 #include <asm/offset.h>
  35 #include <asm/signal.h>
  36 #include <asm/sim.h>
  37 #include <asm/shmparam.h>
  38 #include <asm/sysmips.h>
  39 #include <asm/uaccess.h>
  40
  41 asmlinkage int sys_pipe(nabi_no_regargs volatile struct pt_regs regs)
  42 {
  43         int fd[2];
  44         int error, res;
  45
  46         error = do_pipe(fd);
  47         if (error) {
  48                 res = error;
  49                 goto out;
  50         }
  51         regs.regs[3] = fd[1];
  52         res = fd[0];
  53 out:
  54         return res;
  55 }
  56
  57 unsigned long shm_align_mask = PAGE_SIZE - 1;   /* Sane caches */
  58
  59 #define COLOUR_ALIGN(addr,pgoff)                                \
  60         ((((addr) + shm_align_mask) & ~shm_align_mask) +        \
  61          (((pgoff) << PAGE_SHIFT) & shm_align_mask))
  62
  63 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
  64         unsigned long len, unsigned long pgoff, unsigned long flags)
  65 {
  66         struct vm_area_struct * vmm;
  67         int do_color_align;
  68         unsigned long task_size;
  69
  70         task_size = STACK_TOP;
  71
  72         if (flags & MAP_FIXED) {
  73                 /*
  74                  * We do not accept a shared mapping if it would violate
  75                  * cache aliasing constraints.
  76                  */
  77                 if ((flags & MAP_SHARED) && (addr & shm_align_mask))
  78                         return -EINVAL;
  79                 return addr;
  80         }
  81
  82         if (len > task_size)
  83                 return -ENOMEM;
  84         do_color_align = 0;
  85         if (filp || (flags & MAP_SHARED))
  86                 do_color_align = 1;
  87         if (addr) {
  88                 if (do_color_align)
  89                         addr = COLOUR_ALIGN(addr, pgoff);
  90                 else
  91                         addr = PAGE_ALIGN(addr);
  92                 vmm = find_vma(current->mm, addr);
  93                 if (task_size - len >= addr &&
  94                     (!vmm || addr + len <= vmm->vm_start))
  95                         return addr;
  96         }
  97         addr = TASK_UNMAPPED_BASE;
  98         if (do_color_align)
  99                 addr = COLOUR_ALIGN(addr, pgoff);
 100         else
 101                 addr = PAGE_ALIGN(addr);
 102
 103         for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
 104                 /* At this point:  (!vmm || addr < vmm->vm_end). */
 105                 if (task_size - len < addr)
 106                         return -ENOMEM;
 107                 if (!vmm || addr + len <= vmm->vm_start)
 108                         return addr;
 109                 addr = vmm->vm_end;
 110                 if (do_color_align)
 111                         addr = COLOUR_ALIGN(addr, pgoff);
 112         }
 113 }
 114
 115 /* common code for old and new mmaps */
 116 static inline unsigned long
 117 do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
 118         unsigned long flags, unsigned long fd, unsigned long pgoff)
 119 {
 120         unsigned long 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 unsigned long
 141 old_mmap(unsigned long addr, unsigned long len, int prot,
 142         int flags, int fd, off_t offset)
 143 {
 144         unsigned long result;
 145
 146         result = -EINVAL;
 147         if (offset & ~PAGE_MASK)
 148                 goto out;
 149
 150         result = do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
 151
 152 out:
 153         return result;
 154 }
 155
 156 asmlinkage unsigned long
 157 sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
 158           unsigned long flags, unsigned long fd, unsigned long pgoff)
 159 {
 160         return do_mmap2(addr, len, prot, flags, fd, pgoff);
 161 }
 162
 163 save_static_function(sys_fork);
 164 __attribute_used__ noinline static int
 165 _sys_fork(nabi_no_regargs struct pt_regs regs)
 166 {
 167         return do_fork(SIGCHLD, regs.regs[29], &regs, 0, NULL, NULL);
 168 }
 169
 170 save_static_function(sys_clone);
 171 __attribute_used__ noinline static int
 172 _sys_clone(nabi_no_regargs struct pt_regs regs)
 173 {
 174         unsigned long clone_flags;
 175         unsigned long newsp;
 176         int *parent_tidptr, *child_tidptr;
 177
 178         clone_flags = regs.regs[4];
 179         newsp = regs.regs[5];
 180         if (!newsp)
 181                 newsp = regs.regs[29];
 182         parent_tidptr = (int *) regs.regs[6];
 183         child_tidptr = (int *) regs.regs[7];
 184         return do_fork(clone_flags, newsp, &regs, 0,
 185                        parent_tidptr, child_tidptr);
 186 }
 187
 188 /*
 189  * sys_execve() executes a new program.
 190  */
 191 asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs)
 192 {
 193         int error;
 194         char * filename;
 195
 196         filename = getname((char *) (long)regs.regs[4]);
 197         error = PTR_ERR(filename);
 198         if (IS_ERR(filename))
 199                 goto out;
 200         error = do_execve(filename, (char **) (long)regs.regs[5],
 201                           (char **) (long)regs.regs[6], &regs);
 202         putname(filename);
 203
 204 out:
 205         return error;
 206 }
 207
 208 /*
 209  * Compacrapability ...
 210  */
 211 asmlinkage int sys_uname(struct old_utsname * name)
 212 {
 213         if (name && !copy_to_user(name, &system_utsname, sizeof (*name)))
 214                 return 0;
 215         return -EFAULT;
 216 }
 217
 218 /*
 219  * Compacrapability ...
 220  */
 221 asmlinkage int sys_olduname(struct oldold_utsname * name)
 222 {
 223         int error;
 224
 225         if (!name)
 226                 return -EFAULT;
 227         if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
 228                 return -EFAULT;
 229
 230         error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN);
 231         error -= __put_user(0,name->sysname+__OLD_UTS_LEN);
 232         error -= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN);
 233         error -= __put_user(0,name->nodename+__OLD_UTS_LEN);
 234         error -= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN);
 235         error -= __put_user(0,name->release+__OLD_UTS_LEN);
 236         error -= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN);
 237         error -= __put_user(0,name->version+__OLD_UTS_LEN);
 238         error -= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN);
 239         error = __put_user(0,name->machine+__OLD_UTS_LEN);
 240         error = error ? -EFAULT : 0;
 241
 242         return error;
 243 }
 244
 245 asmlinkage int _sys_sysmips(int cmd, long arg1, int arg2, int arg3)
 246 {
 247         int     tmp, len;
 248         char    *name;
 249
 250         switch(cmd) {
 251         case SETNAME: {
 252                 char nodename[__NEW_UTS_LEN + 1];
 253
 254                 if (!capable(CAP_SYS_ADMIN))
 255                         return -EPERM;
 256
 257                 name = (char *) arg1;
 258
 259                 len = strncpy_from_user(nodename, name, __NEW_UTS_LEN);
 260                 if (len < 0)
 261                         return -EFAULT;
 262
 263                 down_write(&uts_sem);
 264                 strncpy(system_utsname.nodename, nodename, len);
 265                 nodename[__NEW_UTS_LEN] = '\0';
 266                 strlcpy(system_utsname.nodename, nodename,
 267                         sizeof(system_utsname.nodename));
 268                 up_write(&uts_sem);
 269                 return 0;
 270         }
 271
 272         case MIPS_ATOMIC_SET:
 273                 printk(KERN_CRIT "How did I get here?\n");
 274                 return -EINVAL;
 275
 276         case MIPS_FIXADE:
 277                 tmp = current->thread.mflags & ~3;
 278                 current->thread.mflags = tmp | (arg1 & 3);
 279                 return 0;
 280
 281         case FLUSH_CACHE:
 282                 __flush_cache_all();
 283                 return 0;
 284
 285         case MIPS_RDNVRAM:
 286                 return -EIO;
 287         }
 288
 289         return -EINVAL;
 290 }
 291
 292 /*
 293  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 294  *
 295  * This is really horribly ugly.
 296  */
 297 asmlinkage int sys_ipc (uint call, int first, int second,
 298                         unsigned long third, void *ptr, long fifth)
 299 {
 300         int version, ret;
 301
 302         version = call >> 16; /* hack for backward compatibility */
 303         call &= 0xffff;
 304
 305         switch (call) {
 306         case SEMOP:
 307                 return sys_semtimedop (first, (struct sembuf *)ptr, second,
 308                                        NULL);
 309         case SEMTIMEDOP:
 310                 return sys_semtimedop (first, (struct sembuf *)ptr, second,
 311                                        (const struct timespec __user *)fifth);
 312         case SEMGET:
 313                 return sys_semget (first, second, third);
 314         case SEMCTL: {
 315                 union semun fourth;
 316                 if (!ptr)
 317                         return -EINVAL;
 318                 if (get_user(fourth.__pad, (void **) ptr))
 319                         return -EFAULT;
 320                 return sys_semctl (first, second, third, fourth);
 321         }
 322
 323         case MSGSND:
 324                 return sys_msgsnd (first, (struct msgbuf *) ptr,
 325                                    second, third);
 326         case MSGRCV:
 327                 switch (version) {
 328                 case 0: {
 329                         struct ipc_kludge tmp;
 330                         if (!ptr)
 331                                 return -EINVAL;
 332
 333                         if (copy_from_user(&tmp,
 334                                            (struct ipc_kludge *) ptr,
 335                                            sizeof (tmp)))
 336                                 return -EFAULT;
 337                         return sys_msgrcv (first, tmp.msgp, second,
 338                                            tmp.msgtyp, third);
 339                 }
 340                 default:
 341                         return sys_msgrcv (first,
 342                                            (struct msgbuf *) ptr,
 343                                            second, fifth, third);
 344                 }
 345         case MSGGET:
 346                 return sys_msgget ((key_t) first, second);
 347         case MSGCTL:
 348                 return sys_msgctl (first, second, (struct msqid_ds *) ptr);
 349
 350         case SHMAT:
 351                 switch (version) {
 352                 default: {
 353                         ulong raddr;
 354                         ret = do_shmat (first, (char *) ptr, second, &raddr);
 355                         if (ret)
 356                                 return ret;
 357                         return put_user (raddr, (ulong *) third);
 358                 }
 359                 case 1: /* iBCS2 emulator entry point */
 360                         if (!segment_eq(get_fs(), get_ds()))
 361                                 return -EINVAL;
 362                         return do_shmat (first, (char *) ptr, second, (ulong *) third);
 363                 }
 364         case SHMDT:
 365                 return sys_shmdt ((char *)ptr);
 366         case SHMGET:
 367                 return sys_shmget (first, second, third);
 368         case SHMCTL:
 369                 return sys_shmctl (first, second,
 370                                    (struct shmid_ds *) ptr);
 371         default:
 372                 return -ENOSYS;
 373         }
 374 }
 375
 376 /*
 377  * No implemented yet ...
 378  */
 379 asmlinkage int sys_cachectl(char *addr, int nbytes, int op)
 380 {
 381         return -ENOSYS;
 382 }
 383
 384 /*
 385  * If we ever come here the user sp is bad.  Zap the process right away.
 386  * Due to the bad stack signaling wouldn't work.
 387  */
 388 asmlinkage void bad_stack(void)
 389 {
 390         do_exit(SIGSEGV);
 391 }