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 by Ralf Baechle
   7  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
   8  * Copyright (C) 2001 MIPS Technologies, Inc.
   9  */
  10 #include <linux/errno.h>
  11 #include <linux/linkage.h>
  12 #include <linux/mm.h>
  13 #include <linux/smp.h>
  14 #include <linux/smp_lock.h>
  15 #include <linux/mman.h>
  16 #include <linux/ptrace.h>
  17 #include <linux/sched.h>
  18 #include <linux/string.h>
  19 #include <linux/file.h>
  20 #include <linux/slab.h>
  21 #include <linux/utsname.h>
  22 #include <linux/unistd.h>
  23 #include <linux/sem.h>
  24 #include <linux/msg.h>
  25 #include <linux/shm.h>
  26
  27 #include <asm/branch.h>
  28 #include <asm/cachectl.h>
  29 #include <asm/cacheflush.h>
  30 #include <asm/ipc.h>
  31 #include <asm/offset.h>
  32 #include <asm/signal.h>
  33 #include <asm/sim.h>
  34 #include <asm/shmparam.h>
  35 #include <asm/sysmips.h>
  36 #include <asm/uaccess.h>
  37
  38 asmlinkage int sys_pipe(nabi_no_regargs struct pt_regs regs)
  39 {
  40         int fd[2];
  41         int error, res;
  42
  43         error = do_pipe(fd);
  44         if (error) {
  45                 res = error;
  46                 goto out;
  47         }
  48         regs.regs[3] = fd[1];
  49         res = fd[0];
  50 out:
  51         return res;
  52 }
  53
  54 unsigned long shm_align_mask = PAGE_SIZE - 1;   /* Sane caches */
  55
  56 #define COLOUR_ALIGN(addr,pgoff)                                \
  57         ((((addr) + shm_align_mask) & ~shm_align_mask) +        \
  58          (((pgoff) << PAGE_SHIFT) & shm_align_mask))
  59
  60 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
  61         unsigned long len, unsigned long pgoff, unsigned long flags)
  62 {
  63         struct vm_area_struct * vmm;
  64         int do_color_align;
  65
  66         if (flags & MAP_FIXED) {
  67                 /*
  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 (len > TASK_SIZE)
  77                 return -ENOMEM;
  78         do_color_align = 0;
  79         if (filp || (flags & MAP_SHARED))
  80                 do_color_align = 1;
  81         if (addr) {
  82                 if (do_color_align)
  83                         addr = COLOUR_ALIGN(addr, pgoff);
  84                 else
  85                         addr = PAGE_ALIGN(addr);
  86                 vmm = find_vma(current->mm, addr);
  87                 if (TASK_SIZE - len >= addr &&
  88                     (!vmm || addr + len <= vmm->vm_start))
  89                         return addr;
  90         }
  91         addr = TASK_UNMAPPED_BASE;
  92         if (do_color_align)
  93                 addr = COLOUR_ALIGN(addr, pgoff);
  94         else
  95                 addr = PAGE_ALIGN(addr);
  96
  97         for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
  98                 /* At this point:  (!vmm || addr < vmm->vm_end). */
  99                 if (TASK_SIZE - len < addr)
 100                         return -ENOMEM;
 101                 if (!vmm || addr + len <= vmm->vm_start)
 102                         return addr;
 103                 addr = vmm->vm_end;
 104                 if (do_color_align)
 105                         addr = COLOUR_ALIGN(addr, pgoff);
 106         }
 107 }
 108
 109 /* common code for old and new mmaps */
 110 static inline long
 111 do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
 112         unsigned long flags, unsigned long fd, unsigned long pgoff)
 113 {
 114         int error = -EBADF;
 115         struct file * file = NULL;
 116
 117         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
 118         if (!(flags & MAP_ANONYMOUS)) {
 119                 file = fget(fd);
 120                 if (!file)
 121                         goto out;
 122         }
 123
 124         down_write(&current->mm->mmap_sem);
 125         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
 126         up_write(&current->mm->mmap_sem);
 127
 128         if (file)
 129                 fput(file);
 130 out:
 131         return error;
 132 }
 133
 134 asmlinkage unsigned long old_mmap(unsigned long addr, size_t len, int prot,
 135                                   int flags, int fd, off_t offset)
 136 {
 137         int result;
 138
 139         result = -EINVAL;
 140         if (offset & ~PAGE_MASK)
 141                 goto out;
 142
 143         result = do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
 144
 145 out:
 146         return result;
 147 }
 148
 149 asmlinkage long
 150 sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
 151           unsigned long flags, unsigned long fd, unsigned long pgoff)
 152 {
 153         return do_mmap2(addr, len, prot, flags, fd, pgoff);
 154 }
 155
 156 save_static_function(sys_fork);
 157 static_unused int _sys_fork(nabi_no_regargs struct pt_regs regs)
 158 {
 159         save_static(&regs);
 160         return do_fork(SIGCHLD, regs.regs[29], &regs, 0, NULL, NULL);
 161 }
 162
 163 save_static_function(sys_clone);
 164 static_unused int _sys_clone(nabi_no_regargs struct pt_regs regs)
 165 {
 166         unsigned long clone_flags;
 167         unsigned long newsp;
 168         int *parent_tidptr, *child_tidptr;
 169
 170         save_static(&regs);
 171         clone_flags = regs.regs[4];
 172         newsp = regs.regs[5];
 173         if (!newsp)
 174                 newsp = regs.regs[29];
 175         parent_tidptr = (int *) regs.regs[6];
 176         child_tidptr = (int *) regs.regs[7];
 177         return do_fork(clone_flags & ~CLONE_IDLETASK, newsp, &regs, 0,
 178                        parent_tidptr, child_tidptr);
 179 }
 180
 181 /*
 182  * sys_execve() executes a new program.
 183  */
 184 asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs)
 185 {
 186         int error;
 187         char * filename;
 188
 189         filename = getname((char *) (long)regs.regs[4]);
 190         error = PTR_ERR(filename);
 191         if (IS_ERR(filename))
 192                 goto out;
 193         error = do_execve(filename, (char **) (long)regs.regs[5],
 194                           (char **) (long)regs.regs[6], &regs);
 195         putname(filename);
 196
 197 out:
 198         return error;
 199 }
 200
 201 /*
 202  * Compacrapability ...
 203  */
 204 asmlinkage int sys_uname(struct old_utsname * name)
 205 {
 206         if (name && !copy_to_user(name, &system_utsname, sizeof (*name)))
 207                 return 0;
 208         return -EFAULT;
 209 }
 210
 211 /*
 212  * Compacrapability ...
 213  */
 214 asmlinkage int sys_olduname(struct oldold_utsname * name)
 215 {
 216         int error;
 217
 218         if (!name)
 219                 return -EFAULT;
 220         if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
 221                 return -EFAULT;
 222
 223         error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN);
 224         error -= __put_user(0,name->sysname+__OLD_UTS_LEN);
 225         error -= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN);
 226         error -= __put_user(0,name->nodename+__OLD_UTS_LEN);
 227         error -= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN);
 228         error -= __put_user(0,name->release+__OLD_UTS_LEN);
 229         error -= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN);
 230         error -= __put_user(0,name->version+__OLD_UTS_LEN);
 231         error -= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN);
 232         error = __put_user(0,name->machine+__OLD_UTS_LEN);
 233         error = error ? -EFAULT : 0;
 234
 235         return error;
 236 }
 237
 238 asmlinkage int _sys_sysmips(int cmd, long arg1, int arg2, int arg3)
 239 {
 240         int     tmp, len;
 241         char    *name;
 242
 243         switch(cmd) {
 244         case SETNAME: {
 245                 char nodename[__NEW_UTS_LEN + 1];
 246
 247                 if (!capable(CAP_SYS_ADMIN))
 248                         return -EPERM;
 249
 250                 name = (char *) arg1;
 251
 252                 len = strncpy_from_user(nodename, name, __NEW_UTS_LEN);
 253                 if (len < 0)
 254                         return -EFAULT;
 255
 256                 down_write(&uts_sem);
 257                 strncpy(system_utsname.nodename, nodename, len);
 258                 nodename[__NEW_UTS_LEN] = '\0';
 259                 strlcpy(system_utsname.nodename, nodename,
 260                         sizeof(system_utsname.nodename));
 261                 up_write(&uts_sem);
 262                 return 0;
 263         }
 264
 265         case MIPS_ATOMIC_SET:
 266                 printk(KERN_CRIT "How did I get here?\n");
 267                 return -EINVAL;
 268
 269         case MIPS_FIXADE:
 270                 tmp = current->thread.mflags & ~3;
 271                 current->thread.mflags = tmp | (arg1 & 3);
 272                 return 0;
 273
 274         case FLUSH_CACHE:
 275                 __flush_cache_all();
 276                 return 0;
 277
 278         case MIPS_RDNVRAM:
 279                 return -EIO;
 280         }
 281
 282         return -EINVAL;
 283 }
 284
 285 /*
 286  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 287  *
 288  * This is really horribly ugly.
 289  */
 290 asmlinkage int sys_ipc (uint call, int first, int second,
 291                         unsigned long third, void *ptr, long fifth)
 292 {
 293         int version, ret;
 294
 295         version = call >> 16; /* hack for backward compatibility */
 296         call &= 0xffff;
 297
 298         switch (call) {
 299         case SEMOP:
 300                 return sys_semop (first, (struct sembuf *)ptr, second);
 301         case SEMGET:
 302                 return sys_semget (first, second, third);
 303         case SEMCTL: {
 304                 union semun fourth;
 305                 if (!ptr)
 306                         return -EINVAL;
 307                 if (get_user(fourth.__pad, (void **) ptr))
 308                         return -EFAULT;
 309                 return sys_semctl (first, second, third, fourth);
 310         }
 311
 312         case MSGSND:
 313                 return sys_msgsnd (first, (struct msgbuf *) ptr,
 314                                    second, third);
 315         case MSGRCV:
 316                 switch (version) {
 317                 case 0: {
 318                         struct ipc_kludge tmp;
 319                         if (!ptr)
 320                                 return -EINVAL;
 321
 322                         if (copy_from_user(&tmp,
 323                                            (struct ipc_kludge *) ptr,
 324                                            sizeof (tmp)))
 325                                 return -EFAULT;
 326                         return sys_msgrcv (first, tmp.msgp, second,
 327                                            tmp.msgtyp, third);
 328                 }
 329                 default:
 330                         return sys_msgrcv (first,
 331                                            (struct msgbuf *) ptr,
 332                                            second, fifth, third);
 333                 }
 334         case MSGGET:
 335                 return sys_msgget ((key_t) first, second);
 336         case MSGCTL:
 337                 return sys_msgctl (first, second, (struct msqid_ds *) ptr);
 338
 339         case SHMAT:
 340                 switch (version) {
 341                 default: {
 342                         ulong raddr;
 343                         ret = sys_shmat (first, (char *) ptr, second, &raddr);
 344                         if (ret)
 345                                 return ret;
 346                         return put_user (raddr, (ulong *) third);
 347                 }
 348                 case 1: /* iBCS2 emulator entry point */
 349                         if (!segment_eq(get_fs(), get_ds()))
 350                                 return -EINVAL;
 351                         return sys_shmat (first, (char *) ptr, second, (ulong *) third);
 352                 }
 353         case SHMDT:
 354                 return sys_shmdt ((char *)ptr);
 355         case SHMGET:
 356                 return sys_shmget (first, second, third);
 357         case SHMCTL:
 358                 return sys_shmctl (first, second,
 359                                    (struct shmid_ds *) ptr);
 360         default:
 361                 return -ENOSYS;
 362         }
 363 }
 364
 365 /*
 366  * No implemented yet ...
 367  */
 368 asmlinkage int sys_cachectl(char *addr, int nbytes, int op)
 369 {
 370         return -ENOSYS;
 371 }
 372
 373 /*
 374  * If we ever come here the user sp is bad.  Zap the process right away.
 375  * Due to the bad stack signaling wouldn't work.
 376  */
 377 asmlinkage void bad_stack(void)
 378 {
 379         do_exit(SIGSEGV);
 380 }