LXR linux/arch/parisc/kernel/sys

   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
  68asmlinkage 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);
  86out:
  87
  88        return error;
  89}
  90
  91asmlinkage 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
 101struct __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
 111asmlinkage 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
 170asmlinkage 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
 188static inline int
 189get_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
 220static inline void
 221set_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
 244struct msgbuf32 {
 245    int mtype;
 246    char mtext[1];
 247};
 248
 249asmlinkage 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
 273asmlinkage 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
 301asmlinkage 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
 320asmlinkage 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
 344asmlinkage int sys32_lseek(unsigned int fd, int offset, unsigned int origin)
 345{
 346        return sys_lseek(fd, offset, origin);
 347}
 348
 349asmlinkage 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
 364long 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
 371asmlinkage 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}
 377