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linux32.c

/*
 * Conversion between 32-bit and 64-bit native system calls.
 *
 * Copyright (C) 2000 Silicon Graphics, Inc.
 * Written by Ulf Carlsson (ulfc@engr.sgi.com)
 * sys32_execve from ia64/ia32 code, Feb 2000, Kanoj Sarcar (kanoj@sgi.com)
 */
#include <linux/compiler.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/file.h>
#include <linux/smp_lock.h>
#include <linux/highuid.h>
#include <linux/resource.h>
#include <linux/highmem.h>
#include <linux/time.h>
#include <linux/times.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/filter.h>
#include <linux/shm.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/icmpv6.h>
#include <linux/syscalls.h>
#include <linux/sysctl.h>
#include <linux/utime.h>
#include <linux/utsname.h>
#include <linux/personality.h>
#include <linux/dnotify.h>
#include <linux/module.h>
#include <linux/binfmts.h>
#include <linux/security.h>
#include <linux/compat.h>
#include <linux/vfs.h>
#include <linux/ipc.h>

#include <net/sock.h>
#include <net/scm.h>

#include <asm/compat-signal.h>
#include <asm/sim.h>
#include <asm/uaccess.h>
#include <asm/mmu_context.h>
#include <asm/mman.h>

/* Use this to get at 32-bit user passed pointers. */
/* A() macro should be used for places where you e.g.
   have some internal variable u32 and just want to get
   rid of a compiler warning. AA() has to be used in
   places where you want to convert a function argument
   to 32bit pointer or when you e.g. access pt_regs
   structure and want to consider 32bit registers only.
 */
#define A(__x) ((unsigned long)(__x))
#define AA(__x) ((unsigned long)((int)__x))

#ifdef __MIPSEB__
#define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
#endif
#ifdef __MIPSEL__
#define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
#endif

/*
 * Revalidate the inode. This is required for proper NFS attribute caching.
 */

int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf)
{
      struct compat_stat tmp;

      if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
            return -EOVERFLOW;

      memset(&tmp, 0, sizeof(tmp));
      tmp.st_dev = new_encode_dev(stat->dev);
      tmp.st_ino = stat->ino;
      if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
            return -EOVERFLOW;
      tmp.st_mode = stat->mode;
      tmp.st_nlink = stat->nlink;
      SET_UID(tmp.st_uid, stat->uid);
      SET_GID(tmp.st_gid, stat->gid);
      tmp.st_rdev = new_encode_dev(stat->rdev);
      tmp.st_size = stat->size;
      tmp.st_atime = stat->atime.tv_sec;
      tmp.st_mtime = stat->mtime.tv_sec;
      tmp.st_ctime = stat->ctime.tv_sec;
#ifdef STAT_HAVE_NSEC
      tmp.st_atime_nsec = stat->atime.tv_nsec;
      tmp.st_mtime_nsec = stat->mtime.tv_nsec;
      tmp.st_ctime_nsec = stat->ctime.tv_nsec;
#endif
      tmp.st_blocks = stat->blocks;
      tmp.st_blksize = stat->blksize;
      return copy_to_user(statbuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
}

asmlinkage unsigned long
sys32_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
         unsigned long flags, unsigned long fd, unsigned long pgoff)
{
      struct file * file = NULL;
      unsigned long error;

      error = -EINVAL;
      if (pgoff & (~PAGE_MASK >> 12))
            goto out;
      pgoff >>= PAGE_SHIFT-12;

      if (!(flags & MAP_ANONYMOUS)) {
            error = -EBADF;
            file = fget(fd);
            if (!file)
                  goto out;
      }
      flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);

      down_write(&current->mm->mmap_sem);
      error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
      up_write(&current->mm->mmap_sem);
      if (file)
            fput(file);

out:
      return error;
}

/*
 * sys_execve() executes a new program.
 */
asmlinkage int sys32_execve(nabi_no_regargs struct pt_regs regs)
{
      int error;
      char * filename;

      filename = getname(compat_ptr(regs.regs[4]));
      error = PTR_ERR(filename);
      if (IS_ERR(filename))
            goto out;
      error = compat_do_execve(filename, compat_ptr(regs.regs[5]),
                         compat_ptr(regs.regs[6]), &regs);
      putname(filename);

out:
      return error;
}

#define RLIM_INFINITY32 0x7fffffff
#define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)

struct rlimit32 {
      int   rlim_cur;
      int   rlim_max;
};

asmlinkage long sys32_truncate64(const char __user * path,
      unsigned long __dummy, int a2, int a3)
{
      return sys_truncate(path, merge_64(a2, a3));
}

asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long __dummy,
      int a2, int a3)
{
      return sys_ftruncate(fd, merge_64(a2, a3));
}

static inline long
get_tv32(struct timeval *o, struct compat_timeval __user *i)
{
      return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
            (__get_user(o->tv_sec, &i->tv_sec) |
             __get_user(o->tv_usec, &i->tv_usec)));
}

static inline long
put_tv32(struct compat_timeval __user *o, struct timeval *i)
{
      return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
            (__put_user(i->tv_sec, &o->tv_sec) |
             __put_user(i->tv_usec, &o->tv_usec)));
}

extern struct timezone sys_tz;

asmlinkage int
sys32_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
{
      if (tv) {
            struct timeval ktv;
            do_gettimeofday(&ktv);
            if (put_tv32(tv, &ktv))
                  return -EFAULT;
      }
      if (tz) {
            if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
                  return -EFAULT;
      }
      return 0;
}

static inline long get_ts32(struct timespec *o, struct compat_timeval __user *i)
{
      long usec;

      if (!access_ok(VERIFY_READ, i, sizeof(*i)))
            return -EFAULT;
      if (__get_user(o->tv_sec, &i->tv_sec))
            return -EFAULT;
      if (__get_user(usec, &i->tv_usec))
            return -EFAULT;
      o->tv_nsec = usec * 1000;
            return 0;
}

asmlinkage int
sys32_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
{
      struct timespec kts;
      struct timezone ktz;

      if (tv) {
            if (get_ts32(&kts, tv))
                  return -EFAULT;
      }
      if (tz) {
            if (copy_from_user(&ktz, tz, sizeof(ktz)))
                  return -EFAULT;
      }

      return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
}

asmlinkage int sys32_llseek(unsigned int fd, unsigned int offset_high,
                      unsigned int offset_low, loff_t __user * result,
                      unsigned int origin)
{
      return sys_llseek(fd, offset_high, offset_low, result, origin);
}

/* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
   lseek back to original location.  They fail just like lseek does on
   non-seekable files.  */

asmlinkage ssize_t sys32_pread(unsigned int fd, char __user * buf,
                         size_t count, u32 unused, u64 a4, u64 a5)
{
      return sys_pread64(fd, buf, count, merge_64(a4, a5));
}

asmlinkage ssize_t sys32_pwrite(unsigned int fd, const char __user * buf,
                          size_t count, u32 unused, u64 a4, u64 a5)
{
      return sys_pwrite64(fd, buf, count, merge_64(a4, a5));
}

asmlinkage int sys32_sched_rr_get_interval(compat_pid_t pid,
      struct compat_timespec __user *interval)
{
      struct timespec t;
      int ret;
      mm_segment_t old_fs = get_fs();

      set_fs(KERNEL_DS);
      ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
      set_fs(old_fs);
      if (put_user (t.tv_sec, &interval->tv_sec) ||
          __put_user(t.tv_nsec, &interval->tv_nsec))
            return -EFAULT;
      return ret;
}

#ifdef CONFIG_SYSVIPC

asmlinkage long
sys32_ipc(u32 call, int first, int second, int third, u32 ptr, u32 fifth)
{
      int version, err;

      version = call >> 16; /* hack for backward compatibility */
      call &= 0xffff;

      switch (call) {
      case SEMOP:
            /* struct sembuf is the same on 32 and 64bit :)) */
            err = sys_semtimedop(first, compat_ptr(ptr), second, NULL);
            break;
      case SEMTIMEDOP:
            err = compat_sys_semtimedop(first, compat_ptr(ptr), second,
                                  compat_ptr(fifth));
            break;
      case SEMGET:
            err = sys_semget(first, second, third);
            break;
      case SEMCTL:
            err = compat_sys_semctl(first, second, third, compat_ptr(ptr));
            break;
      case MSGSND:
            err = compat_sys_msgsnd(first, second, third, compat_ptr(ptr));
            break;
      case MSGRCV:
            err = compat_sys_msgrcv(first, second, fifth, third,
                              version, compat_ptr(ptr));
            break;
      case MSGGET:
            err = sys_msgget((key_t) first, second);
            break;
      case MSGCTL:
            err = compat_sys_msgctl(first, second, compat_ptr(ptr));
            break;
      case SHMAT:
            err = compat_sys_shmat(first, second, third, version,
                               compat_ptr(ptr));
            break;
      case SHMDT:
            err = sys_shmdt(compat_ptr(ptr));
            break;
      case SHMGET:
            err = sys_shmget(first, (unsigned)second, third);
            break;
      case SHMCTL:
            err = compat_sys_shmctl(first, second, compat_ptr(ptr));
            break;
      default:
            err = -EINVAL;
            break;
      }

      return err;
}

#else

asmlinkage long
sys32_ipc(u32 call, int first, int second, int third, u32 ptr, u32 fifth)
{
      return -ENOSYS;
}

#endif /* CONFIG_SYSVIPC */

#ifdef CONFIG_MIPS32_N32
asmlinkage long sysn32_semctl(int semid, int semnum, int cmd, u32 arg)
{
      /* compat_sys_semctl expects a pointer to union semun */
      u32 __user *uptr = compat_alloc_user_space(sizeof(u32));
      if (put_user(arg, uptr))
            return -EFAULT;
      return compat_sys_semctl(semid, semnum, cmd, uptr);
}

asmlinkage long sysn32_msgsnd(int msqid, u32 msgp, unsigned msgsz, int msgflg)
{
      return compat_sys_msgsnd(msqid, msgsz, msgflg, compat_ptr(msgp));
}

asmlinkage long sysn32_msgrcv(int msqid, u32 msgp, size_t msgsz, int msgtyp,
                        int msgflg)
{
      return compat_sys_msgrcv(msqid, msgsz, msgtyp, msgflg, IPC_64,
                         compat_ptr(msgp));
}
#endif

struct sysctl_args32
{
      compat_caddr_t name;
      int nlen;
      compat_caddr_t oldval;
      compat_caddr_t oldlenp;
      compat_caddr_t newval;
      compat_size_t newlen;
      unsigned int __unused[4];
};

#ifdef CONFIG_SYSCTL_SYSCALL

asmlinkage long sys32_sysctl(struct sysctl_args32 __user *args)
{
      struct sysctl_args32 tmp;
      int error;
      size_t oldlen;
      size_t __user *oldlenp = NULL;
      unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;

      if (copy_from_user(&tmp, args, sizeof(tmp)))
            return -EFAULT;

      if (tmp.oldval && tmp.oldlenp) {
            /* Duh, this is ugly and might not work if sysctl_args
               is in read-only memory, but do_sysctl does indirectly
               a lot of uaccess in both directions and we'd have to
               basically copy the whole sysctl.c here, and
               glibc's __sysctl uses rw memory for the structure
               anyway.  */
            if (get_user(oldlen, (u32 __user *)A(tmp.oldlenp)) ||
                put_user(oldlen, (size_t __user *)addr))
                  return -EFAULT;
            oldlenp = (size_t __user *)addr;
      }

      lock_kernel();
      error = do_sysctl((int __user *)A(tmp.name), tmp.nlen, (void __user *)A(tmp.oldval),
                    oldlenp, (void __user *)A(tmp.newval), tmp.newlen);
      unlock_kernel();
      if (oldlenp) {
            if (!error) {
                  if (get_user(oldlen, (size_t __user *)addr) ||
                      put_user(oldlen, (u32 __user *)A(tmp.oldlenp)))
                        error = -EFAULT;
            }
            copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused));
      }
      return error;
}

#endif /* CONFIG_SYSCTL_SYSCALL */

asmlinkage long sys32_newuname(struct new_utsname __user * name)
{
      int ret = 0;

      down_read(&uts_sem);
      if (copy_to_user(name, utsname(), sizeof *name))
            ret = -EFAULT;
      up_read(&uts_sem);

      if (current->personality == PER_LINUX32 && !ret)
            if (copy_to_user(name->machine, "mips\0\0\0", 8))
                  ret = -EFAULT;

      return ret;
}

asmlinkage int sys32_personality(unsigned long personality)
{
      int ret;
      personality &= 0xffffffff;
      if (personality(current->personality) == PER_LINUX32 &&
          personality == PER_LINUX)
            personality = PER_LINUX32;
      ret = sys_personality(personality);
      if (ret == PER_LINUX32)
            ret = PER_LINUX;
      return ret;
}

/* ustat compatibility */
struct ustat32 {
      compat_daddr_t    f_tfree;
      compat_ino_t      f_tinode;
      char        f_fname[6];
      char        f_fpack[6];
};

extern asmlinkage long sys_ustat(dev_t dev, struct ustat __user * ubuf);

asmlinkage int sys32_ustat(dev_t dev, struct ustat32 __user * ubuf32)
{
      int err;
      struct ustat tmp;
      struct ustat32 tmp32;
      mm_segment_t old_fs = get_fs();

      set_fs(KERNEL_DS);
      err = sys_ustat(dev, (struct ustat __user *)&tmp);
      set_fs(old_fs);

      if (err)
            goto out;

      memset(&tmp32, 0, sizeof(struct ustat32));
      tmp32.f_tfree = tmp.f_tfree;
      tmp32.f_tinode = tmp.f_tinode;

      err = copy_to_user(ubuf32, &tmp32, sizeof(struct ustat32)) ? -EFAULT : 0;

out:
      return err;
}

asmlinkage int sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset,
      s32 count)
{
      mm_segment_t old_fs = get_fs();
      int ret;
      off_t of;

      if (offset && get_user(of, offset))
            return -EFAULT;

      set_fs(KERNEL_DS);
      ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count);
      set_fs(old_fs);

      if (offset && put_user(of, offset))
            return -EFAULT;

      return ret;
}

asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
                                   size_t count)
{
      return sys_readahead(fd, merge_64(a2, a3), count);
}

asmlinkage long sys32_sync_file_range(int fd, int __pad,
      unsigned long a2, unsigned long a3,
      unsigned long a4, unsigned long a5,
      int flags)
{
      return sys_sync_file_range(fd,
                  merge_64(a2, a3), merge_64(a4, a5),
                  flags);
}

asmlinkage long sys32_fadvise64_64(int fd, int __pad,
      unsigned long a2, unsigned long a3,
      unsigned long a4, unsigned long a5,
      int flags)
{
      return sys_fadvise64_64(fd,
                  merge_64(a2, a3), merge_64(a4, a5),
                  flags);
}

asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
      unsigned offset_a3, unsigned len_a4, unsigned len_a5)
{
      return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
                           merge_64(len_a4, len_a5));
}

save_static_function(sys32_clone);
static int noinline __used
_sys32_clone(nabi_no_regargs struct pt_regs regs)
{
      unsigned long clone_flags;
      unsigned long newsp;
      int __user *parent_tidptr, *child_tidptr;

      clone_flags = regs.regs[4];
      newsp = regs.regs[5];
      if (!newsp)
            newsp = regs.regs[29];
      parent_tidptr = (int __user *) regs.regs[6];

      /* Use __dummy4 instead of getting it off the stack, so that
         syscall() works.  */
      child_tidptr = (int __user *) __dummy4;
      return do_fork(clone_flags, newsp, &regs, 0,
                     parent_tidptr, child_tidptr);
}

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