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         if (error == 0) {
  81                 task_lock(current);
  82                 current->ptrace &= ~PT_DTRACE;
  83                 task_unlock(current);
  84         }
  85         putname(filename);
  86 out:
  87
  88         return error;
  89 }
  90
  91 asmlinkage long sys32_unimplemented(int r26, int r25, int r24, int r23,
  92         int r22, int r21, int r20)
  93 {
  94     printk(KERN_ERR "%s(%d): Unimplemented 32 on 64 syscall #%d!\n",
  95         current->comm, current->pid, r20);
  96     return -ENOSYS;
  97 }
  98
  99 #ifdef CONFIG_SYSCTL
 100
 101 struct __sysctl_args32 {
 102         u32 name;
 103         int nlen;
 104         u32 oldval;
 105         u32 oldlenp;
 106         u32 newval;
 107         u32 newlen;
 108         u32 __unused[4];
 109 };
 110
 111 asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
 112 {
 113 #ifndef CONFIG_SYSCTL_SYSCALL
 114         return -ENOSYS;
 115 #else
 116         struct __sysctl_args32 tmp;
 117         int error;
 118         unsigned int oldlen32;
 119         size_t oldlen, __user *oldlenp = NULL;
 120         unsigned long addr = (((long __force)&args->__unused[0]) + 7) & ~7;
 121
 122         DBG(("sysctl32(%p)\n", args));
 123
 124         if (copy_from_user(&tmp, args, sizeof(tmp)))
 125                 return -EFAULT;
 126
 127         if (tmp.oldval && tmp.oldlenp) {
 128                 /* Duh, this is ugly and might not work if sysctl_args
 129                    is in read-only memory, but do_sysctl does indirectly
 130                    a lot of uaccess in both directions and we'd have to
 131                    basically copy the whole sysctl.c here, and
 132                    glibc's __sysctl uses rw memory for the structure
 133                    anyway.  */
 134                 /* a possibly better hack than this, which will avoid the
 135                  * problem if the struct is read only, is to push the
 136                  * 'oldlen' value out to the user's stack instead. -PB
 137                  */
 138                 if (get_user(oldlen32, (u32 *)(u64)tmp.oldlenp))
 139                         return -EFAULT;
 140                 oldlen = oldlen32;
 141                 if (put_user(oldlen, (size_t *)addr))
 142                         return -EFAULT;
 143                 oldlenp = (size_t *)addr;
 144         }
 145
 146         lock_kernel();
 147         error = do_sysctl((int __user *)(u64)tmp.name, tmp.nlen,
 148                           (void __user *)(u64)tmp.oldval, oldlenp,
 149                           (void __user *)(u64)tmp.newval, tmp.newlen);
 150         unlock_kernel();
 151         if (oldlenp) {
 152                 if (!error) {
 153                         if (get_user(oldlen, (size_t *)addr)) {
 154                                 error = -EFAULT;
 155                         } else {
 156                                 oldlen32 = oldlen;
 157                                 if (put_user(oldlen32, (u32 *)(u64)tmp.oldlenp))
 158                                         error = -EFAULT;
 159                         }
 160                 }
 161                 if (copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused)))
 162                         error = -EFAULT;
 163         }
 164         return error;
 165 #endif
 166 }
 167
 168 #endif /* CONFIG_SYSCTL */
 169
 170 asmlinkage long sys32_sched_rr_get_interval(pid_t pid,
 171         struct compat_timespec __user *interval)
 172 {
 173         struct timespec t;
 174         int ret;
 175
 176         KERNEL_SYSCALL(ret, sys_sched_rr_get_interval, pid, (struct timespec __user *)&t);
 177         if (put_compat_timespec(&t, interval))
 178                 return -EFAULT;
 179         return ret;
 180 }
 181
 182 /*** copied from mips64 ***/
 183 /*
 184  * Ooo, nasty.  We need here to frob 32-bit unsigned longs to
 185  * 64-bit unsigned longs.
 186  */
 187
 188 static inline int
 189 get_fd_set32(unsigned long n, u32 *ufdset, unsigned long *fdset)
 190 {
 191         n = (n + 8*sizeof(u32) - 1) / (8*sizeof(u32));
 192         if (ufdset) {
 193                 unsigned long odd;
 194
 195                 if (!access_ok(VERIFY_WRITE, ufdset, n*sizeof(u32)))
 196                         return -EFAULT;
 197
 198                 odd = n & 1UL;
 199                 n &= ~1UL;
 200                 while (n) {
 201                         unsigned long h, l;
 202                         __get_user(l, ufdset);
 203                         __get_user(h, ufdset+1);
 204                         ufdset += 2;
 205                         *fdset++ = h << 32 | l;
 206                         n -= 2;
 207                 }
 208                 if (odd)
 209                         __get_user(*fdset, ufdset);
 210         } else {
 211                 /* Tricky, must clear full unsigned long in the
 212                  * kernel fdset at the end, this makes sure that
 213                  * actually happens.
 214                  */
 215                 memset(fdset, 0, ((n + 1) & ~1)*sizeof(u32));
 216         }
 217         return 0;
 218 }
 219
 220 static inline void
 221 set_fd_set32(unsigned long n, u32 *ufdset, unsigned long *fdset)
 222 {
 223         unsigned long odd;
 224         n = (n + 8*sizeof(u32) - 1) / (8*sizeof(u32));
 225
 226         if (!ufdset)
 227                 return;
 228
 229         odd = n & 1UL;
 230         n &= ~1UL;
 231         while (n) {
 232                 unsigned long h, l;
 233                 l = *fdset++;
 234                 h = l >> 32;
 235                 __put_user(l, ufdset);
 236                 __put_user(h, ufdset+1);
 237                 ufdset += 2;
 238                 n -= 2;
 239         }
 240         if (odd)
 241                 __put_user(*fdset, ufdset);
 242 }
 243
 244 struct msgbuf32 {
 245     int mtype;
 246     char mtext[1];
 247 };
 248
 249 asmlinkage long sys32_msgsnd(int msqid,
 250                                 struct msgbuf32 __user *umsgp32,
 251                                 size_t msgsz, int msgflg)
 252 {
 253         struct msgbuf *mb;
 254         struct msgbuf32 mb32;
 255         int err;
 256
 257         if ((mb = kmalloc(msgsz + sizeof *mb + 4, GFP_KERNEL)) == NULL)
 258                 return -ENOMEM;
 259
 260         err = get_user(mb32.mtype, &umsgp32->mtype);
 261         mb->mtype = mb32.mtype;
 262         err |= copy_from_user(mb->mtext, &umsgp32->mtext, msgsz);
 263
 264         if (err)
 265                 err = -EFAULT;
 266         else
 267                 KERNEL_SYSCALL(err, sys_msgsnd, msqid, (struct msgbuf __user *)mb, msgsz, msgflg);
 268
 269         kfree(mb);
 270         return err;
 271 }
 272
 273 asmlinkage long sys32_msgrcv(int msqid,
 274                                 struct msgbuf32 __user *umsgp32,
 275                                 size_t msgsz, long msgtyp, int msgflg)
 276 {
 277         struct msgbuf *mb;
 278         struct msgbuf32 mb32;
 279         int err, len;
 280
 281         if ((mb = kmalloc(msgsz + sizeof *mb + 4, GFP_KERNEL)) == NULL)
 282                 return -ENOMEM;
 283
 284         KERNEL_SYSCALL(err, sys_msgrcv, msqid, (struct msgbuf __user *)mb, msgsz, msgtyp, msgflg);
 285
 286         if (err >= 0) {
 287                 len = err;
 288                 mb32.mtype = mb->mtype;
 289                 err = put_user(mb32.mtype, &umsgp32->mtype);
 290                 err |= copy_to_user(&umsgp32->mtext, mb->mtext, len);
 291                 if (err)
 292                         err = -EFAULT;
 293                 else
 294                         err = len;
 295         }
 296
 297         kfree(mb);
 298         return err;
 299 }
 300
 301 asmlinkage int sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, s32 count)
 302 {
 303         mm_segment_t old_fs = get_fs();
 304         int ret;
 305         off_t of;
 306
 307         if (offset && get_user(of, offset))
 308                 return -EFAULT;
 309
 310         set_fs(KERNEL_DS);
 311         ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count);
 312         set_fs(old_fs);
 313
 314         if (offset && put_user(of, offset))
 315                 return -EFAULT;
 316
 317         return ret;
 318 }
 319
 320 asmlinkage int sys32_sendfile64(int out_fd, int in_fd, compat_loff_t __user *offset, s32 count)
 321 {
 322         mm_segment_t old_fs = get_fs();
 323         int ret;
 324         loff_t lof;
 325
 326         if (offset && get_user(lof, offset))
 327                 return -EFAULT;
 328
 329         set_fs(KERNEL_DS);
 330         ret = sys_sendfile64(out_fd, in_fd, offset ? (loff_t __user *)&lof : NULL, count);
 331         set_fs(old_fs);
 332
 333         if (offset && put_user(lof, offset))
 334                 return -EFAULT;
 335
 336         return ret;
 337 }
 338
 339
 340 /* lseek() needs a wrapper because 'offset' can be negative, but the top
 341  * half of the argument has been zeroed by syscall.S.
 342  */
 343
 344 asmlinkage int sys32_lseek(unsigned int fd, int offset, unsigned int origin)
 345 {
 346         return sys_lseek(fd, offset, origin);
 347 }
 348
 349 asmlinkage long sys32_semctl(int semid, int semnum, int cmd, union semun arg)
 350 {
 351         union semun u;
 352
 353         if (cmd == SETVAL) {
 354                 /* Ugh.  arg is a union of int,ptr,ptr,ptr, so is 8 bytes.
 355                  * The int should be in the first 4, but our argument
 356                  * frobbing has left it in the last 4.
 357                  */
 358                 u.val = *((int *)&arg + 1);
 359                 return sys_semctl (semid, semnum, cmd, u);
 360         }
 361         return sys_semctl (semid, semnum, cmd, arg);
 362 }
 363
 364 long sys32_lookup_dcookie(u32 cookie_high, u32 cookie_low, char __user *buf,
 365                           size_t len)
 366 {
 367         return sys_lookup_dcookie((u64)cookie_high << 32 | cookie_low,
 368                                   buf, len);
 369 }
 370
 371 asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offhi, u32 offlo,
 372                                 u32 lenhi, u32 lenlo)
 373 {
 374         return sys_fallocate(fd, mode, ((loff_t)offhi << 32) | offlo,
 375                              ((loff_t)lenhi << 32) | lenlo);
 376 }