arch/parisc/kernel/sys_parisc32.c

   1 /*
   2  * sys_parisc32.c: Conversion between 32bit and 64bit native syscalls.
   3  *
   4  * Copyright (C) 2000-2001 Hewlett Packard Company
   5  * Copyright (C) 2000 John Marvin
   6  * Copyright (C) 2001 Matthew Wilcox
   7  *
   8  * These routines maintain argument size conversion between 32bit and 64bit
   9  * environment. Based heavily on sys_ia32.c and sys_sparc32.c.
  10  */
  11
  12 #include <linux/compat.h>
  13 #include <linux/kernel.h>
  14 #include <linux/sched.h>
  15 #include <linux/fs.h>
  16 #include <linux/mm.h>
  17 #include <linux/file.h>
  18 #include <linux/signal.h>
  19 #include <linux/resource.h>
  20 #include <linux/times.h>
  21 #include <linux/utsname.h>
  22 #include <linux/time.h>
  23 #include <linux/smp.h>
  24 #include <linux/smp_lock.h>
  25 #include <linux/sem.h>
  26 #include <linux/msg.h>
  27 #include <linux/shm.h>
  28 #include <linux/slab.h>
  29 #include <linux/uio.h>
  30 #include <linux/nfs_fs.h>
  31 #include <linux/ncp_fs.h>
  32 #include <linux/sunrpc/svc.h>
  33 #include <linux/nfsd/nfsd.h>
  34 #include <linux/nfsd/cache.h>
  35 #include <linux/nfsd/xdr.h>
  36 #include <linux/nfsd/syscall.h>
  37 #include <linux/poll.h>
  38 #include <linux/personality.h>
  39 #include <linux/stat.h>
  40 #include <linux/highmem.h>
  41 #include <linux/highuid.h>
  42 #include <linux/mman.h>
  43 #include <linux/binfmts.h>
  44 #include <linux/namei.h>
  45 #include <linux/vfs.h>
  46 #include <linux/ptrace.h>
  47 #include <linux/swap.h>
  48 #include <linux/syscalls.h>
  49
  50 #include <asm/types.h>
  51 #include <asm/uaccess.h>
  52 #include <asm/mmu_context.h>
  53
  54 #include "sys32.h"
  55
  56 #undef DEBUG
  57
  58 #ifdef DEBUG
  59 #define DBG(x)  printk x
  60 #else
  61 #define DBG(x)
  62 #endif
  63
  64 /*
  65  * sys32_execve() executes a new program.
  66  */
  67
  68 asmlinkage int sys32_execve(struct pt_regs *regs)
  69 {
  70         int error;
  71         char *filename;
  72
  73         DBG(("sys32_execve(%p) r26 = 0x%lx\n", regs, regs->gr[26]));
  74         filename = getname((const char __user *) regs->gr[26]);
  75         error = PTR_ERR(filename);
  76         if (IS_ERR(filename))
  77                 goto out;
  78         error = compat_do_execve(filename, compat_ptr(regs->gr[25]),
  79                                  compat_ptr(regs->gr[24]), regs);
  80         putname(filename);
  81 out:
  82
  83         return error;
  84 }
  85
  86 asmlinkage long sys32_unimplemented(int r26, int r25, int r24, int r23,
  87         int r22, int r21, int r20)
  88 {
  89     printk(KERN_ERR "%s(%d): Unimplemented 32 on 64 syscall #%d!\n",
  90         current->comm, current->pid, r20);
  91     return -ENOSYS;
  92 }
  93
  94 #ifdef CONFIG_SYSCTL
  95
  96 struct __sysctl_args32 {
  97         u32 name;
  98         int nlen;
  99         u32 oldval;
 100         u32 oldlenp;
 101         u32 newval;
 102         u32 newlen;
 103         u32 __unused[4];
 104 };
 105
 106 asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
 107 {
 108 #ifndef CONFIG_SYSCTL_SYSCALL
 109         return -ENOSYS;
 110 #else
 111         struct __sysctl_args32 tmp;
 112         int error;
 113         unsigned int oldlen32;
 114         size_t oldlen, __user *oldlenp = NULL;
 115         unsigned long addr = (((long __force)&args->__unused[0]) + 7) & ~7;
 116
 117         DBG(("sysctl32(%p)\n", args));
 118
 119         if (copy_from_user(&tmp, args, sizeof(tmp)))
 120                 return -EFAULT;
 121
 122         if (tmp.oldval && tmp.oldlenp) {
 123                 /* Duh, this is ugly and might not work if sysctl_args
 124                    is in read-only memory, but do_sysctl does indirectly
 125                    a lot of uaccess in both directions and we'd have to
 126                    basically copy the whole sysctl.c here, and
 127                    glibc's __sysctl uses rw memory for the structure
 128                    anyway.  */
 129                 /* a possibly better hack than this, which will avoid the
 130                  * problem if the struct is read only, is to push the
 131                  * 'oldlen' value out to the user's stack instead. -PB
 132                  */
 133                 if (get_user(oldlen32, (u32 *)(u64)tmp.oldlenp))
 134                         return -EFAULT;
 135                 oldlen = oldlen32;
 136                 if (put_user(oldlen, (size_t *)addr))
 137                         return -EFAULT;
 138                 oldlenp = (size_t *)addr;
 139         }
 140
 141         lock_kernel();
 142         error = do_sysctl((int __user *)(u64)tmp.name, tmp.nlen,
 143                           (void __user *)(u64)tmp.oldval, oldlenp,
 144                           (void __user *)(u64)tmp.newval, tmp.newlen);
 145         unlock_kernel();
 146         if (oldlenp) {
 147                 if (!error) {
 148                         if (get_user(oldlen, (size_t *)addr)) {
 149                                 error = -EFAULT;
 150                         } else {
 151                                 oldlen32 = oldlen;
 152                                 if (put_user(oldlen32, (u32 *)(u64)tmp.oldlenp))
 153                                         error = -EFAULT;
 154                         }
 155                 }
 156                 if (copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused)))
 157                         error = -EFAULT;
 158         }
 159         return error;
 160 #endif
 161 }
 162
 163 #endif /* CONFIG_SYSCTL */
 164
 165 asmlinkage long sys32_sched_rr_get_interval(pid_t pid,
 166         struct compat_timespec __user *interval)
 167 {
 168         struct timespec t;
 169         int ret;
 170
 171         KERNEL_SYSCALL(ret, sys_sched_rr_get_interval, pid, (struct timespec __user *)&t);
 172         if (put_compat_timespec(&t, interval))
 173                 return -EFAULT;
 174         return ret;
 175 }
 176
 177 /*** copied from mips64 ***/
 178 /*
 179  * Ooo, nasty.  We need here to frob 32-bit unsigned longs to
 180  * 64-bit unsigned longs.
 181  */
 182
 183 static inline int
 184 get_fd_set32(unsigned long n, u32 *ufdset, unsigned long *fdset)
 185 {
 186         n = (n + 8*sizeof(u32) - 1) / (8*sizeof(u32));
 187         if (ufdset) {
 188                 unsigned long odd;
 189
 190                 if (!access_ok(VERIFY_WRITE, ufdset, n*sizeof(u32)))
 191                         return -EFAULT;
 192
 193                 odd = n & 1UL;
 194                 n &= ~1UL;
 195                 while (n) {
 196                         unsigned long h, l;
 197                         __get_user(l, ufdset);
 198                         __get_user(h, ufdset+1);
 199                         ufdset += 2;
 200                         *fdset++ = h << 32 | l;
 201                         n -= 2;
 202                 }
 203                 if (odd)
 204                         __get_user(*fdset, ufdset);
 205         } else {
 206                 /* Tricky, must clear full unsigned long in the
 207                  * kernel fdset at the end, this makes sure that
 208                  * actually happens.
 209                  */
 210                 memset(fdset, 0, ((n + 1) & ~1)*sizeof(u32));
 211         }
 212         return 0;
 213 }
 214
 215 static inline void
 216 set_fd_set32(unsigned long n, u32 *ufdset, unsigned long *fdset)
 217 {
 218         unsigned long odd;
 219         n = (n + 8*sizeof(u32) - 1) / (8*sizeof(u32));
 220
 221         if (!ufdset)
 222                 return;
 223
 224         odd = n & 1UL;
 225         n &= ~1UL;
 226         while (n) {
 227                 unsigned long h, l;
 228                 l = *fdset++;
 229                 h = l >> 32;
 230                 __put_user(l, ufdset);
 231                 __put_user(h, ufdset+1);
 232                 ufdset += 2;
 233                 n -= 2;
 234         }
 235         if (odd)
 236                 __put_user(*fdset, ufdset);
 237 }
 238
 239 struct msgbuf32 {
 240     int mtype;
 241     char mtext[1];
 242 };
 243
 244 asmlinkage long sys32_msgsnd(int msqid,
 245                                 struct msgbuf32 __user *umsgp32,
 246                                 size_t msgsz, int msgflg)
 247 {
 248         struct msgbuf *mb;
 249         struct msgbuf32 mb32;
 250         int err;
 251
 252         if ((mb = kmalloc(msgsz + sizeof *mb + 4, GFP_KERNEL)) == NULL)
 253                 return -ENOMEM;
 254
 255         err = get_user(mb32.mtype, &umsgp32->mtype);
 256         mb->mtype = mb32.mtype;
 257         err |= copy_from_user(mb->mtext, &umsgp32->mtext, msgsz);
 258
 259         if (err)
 260                 err = -EFAULT;
 261         else
 262                 KERNEL_SYSCALL(err, sys_msgsnd, msqid, (struct msgbuf __user *)mb, msgsz, msgflg);
 263
 264         kfree(mb);
 265         return err;
 266 }
 267
 268 asmlinkage long sys32_msgrcv(int msqid,
 269                                 struct msgbuf32 __user *umsgp32,
 270                                 size_t msgsz, long msgtyp, int msgflg)
 271 {
 272         struct msgbuf *mb;
 273         struct msgbuf32 mb32;
 274         int err, len;
 275
 276         if ((mb = kmalloc(msgsz + sizeof *mb + 4, GFP_KERNEL)) == NULL)
 277                 return -ENOMEM;
 278
 279         KERNEL_SYSCALL(err, sys_msgrcv, msqid, (struct msgbuf __user *)mb, msgsz, msgtyp, msgflg);
 280
 281         if (err >= 0) {
 282                 len = err;
 283                 mb32.mtype = mb->mtype;
 284                 err = put_user(mb32.mtype, &umsgp32->mtype);
 285                 err |= copy_to_user(&umsgp32->mtext, mb->mtext, len);
 286                 if (err)
 287                         err = -EFAULT;
 288                 else
 289                         err = len;
 290         }
 291
 292         kfree(mb);
 293         return err;
 294 }
 295
 296 asmlinkage int sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, s32 count)
 297 {
 298         mm_segment_t old_fs = get_fs();
 299         int ret;
 300         off_t of;
 301
 302         if (offset && get_user(of, offset))
 303                 return -EFAULT;
 304
 305         set_fs(KERNEL_DS);
 306         ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count);
 307         set_fs(old_fs);
 308
 309         if (offset && put_user(of, offset))
 310                 return -EFAULT;
 311
 312         return ret;
 313 }
 314
 315 asmlinkage int sys32_sendfile64(int out_fd, int in_fd, compat_loff_t __user *offset, s32 count)
 316 {
 317         mm_segment_t old_fs = get_fs();
 318         int ret;
 319         loff_t lof;
 320
 321         if (offset && get_user(lof, offset))
 322                 return -EFAULT;
 323
 324         set_fs(KERNEL_DS);
 325         ret = sys_sendfile64(out_fd, in_fd, offset ? (loff_t __user *)&lof : NULL, count);
 326         set_fs(old_fs);
 327
 328         if (offset && put_user(lof, offset))
 329                 return -EFAULT;
 330
 331         return ret;
 332 }
 333
 334
 335 /* lseek() needs a wrapper because 'offset' can be negative, but the top
 336  * half of the argument has been zeroed by syscall.S.
 337  */
 338
 339 asmlinkage int sys32_lseek(unsigned int fd, int offset, unsigned int origin)
 340 {
 341         return sys_lseek(fd, offset, origin);
 342 }
 343
 344 asmlinkage long sys32_semctl(int semid, int semnum, int cmd, union semun arg)
 345 {
 346         union semun u;
 347
 348         if (cmd == SETVAL) {
 349                 /* Ugh.  arg is a union of int,ptr,ptr,ptr, so is 8 bytes.
 350                  * The int should be in the first 4, but our argument
 351                  * frobbing has left it in the last 4.
 352                  */
 353                 u.val = *((int *)&arg + 1);
 354                 return sys_semctl (semid, semnum, cmd, u);
 355         }
 356         return sys_semctl (semid, semnum, cmd, arg);
 357 }
 358
 359 long sys32_lookup_dcookie(u32 cookie_high, u32 cookie_low, char __user *buf,
 360                           size_t len)
 361 {
 362         return sys_lookup_dcookie((u64)cookie_high << 32 | cookie_low,
 363                                   buf, len);
 364 }
 365
 366 asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offhi, u32 offlo,
 367                                 u32 lenhi, u32 lenlo)
 368 {
 369         return sys_fallocate(fd, mode, ((loff_t)offhi << 32) | offlo,
 370                              ((loff_t)lenhi << 32) | lenlo);
 371 }