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sysirix.c

/*
 * sysirix.c: IRIX system call emulation.
 *
 * Copyright (C) 1996 David S. Miller
 * Copyright (C) 1997 Miguel de Icaza
 * Copyright (C) 1997, 1998, 1999, 2000 Ralf Baechle
 */
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/binfmts.h>
#include <linux/capability.h>
#include <linux/highuid.h>
#include <linux/pagemap.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/slab.h>
#include <linux/swap.h>
#include <linux/errno.h>
#include <linux/time.h>
#include <linux/timex.h>
#include <linux/times.h>
#include <linux/elf.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/utsname.h>
#include <linux/file.h>
#include <linux/vfs.h>
#include <linux/namei.h>
#include <linux/socket.h>
#include <linux/security.h>
#include <linux/syscalls.h>
#include <linux/resource.h>

#include <asm/ptrace.h>
#include <asm/page.h>
#include <asm/uaccess.h>
#include <asm/inventory.h>

/* 2,191 lines of complete and utter shit coming up... */

extern int max_threads;

/* The sysmp commands supported thus far. */
#define MP_NPROCS             1 /* # processor in complex */
#define MP_NAPROCS            2 /* # active processors in complex */
#define MP_PGSIZE             14 /* Return system page size in v1. */

asmlinkage int irix_sysmp(struct pt_regs *regs)
{
      unsigned long cmd;
      int base = 0;
      int error = 0;

      if(regs->regs[2] == 1000)
            base = 1;
      cmd = regs->regs[base + 4];
      switch(cmd) {
      case MP_PGSIZE:
            error = PAGE_SIZE;
            break;
      case MP_NPROCS:
      case MP_NAPROCS:
            error = num_online_cpus();
            break;
      default:
            printk("SYSMP[%s:%d]: Unsupported opcode %d\n",
                   current->comm, current->pid, (int)cmd);
            error = -EINVAL;
            break;
      }

      return error;
}

/* The prctl commands. */
#define PR_MAXPROCS            1 /* Tasks/user. */
#define PR_ISBLOCKED           2 /* If blocked, return 1. */
#define PR_SETSTACKSIZE        3 /* Set largest task stack size. */
#define PR_GETSTACKSIZE        4 /* Get largest task stack size. */
#define PR_MAXPPROCS           5 /* Num parallel tasks. */
#define PR_UNBLKONEXEC         6 /* When task exec/exit's, unblock. */
#define PR_SETEXITSIG          8 /* When task exit's, set signal. */
#define PR_RESIDENT            9 /* Make task unswappable. */
#define PR_ATTACHADDR         10 /* (Re-)Connect a vma to a task. */
#define PR_DETACHADDR         11 /* Disconnect a vma from a task. */
#define PR_TERMCHILD          12 /* Kill child if the parent dies. */
#define PR_GETSHMASK          13 /* Get the sproc() share mask. */
#define PR_GETNSHARE          14 /* Number of share group members. */
#define PR_COREPID            15 /* Add task pid to name when it core. */
#define PR_ATTACHADDRPERM     16 /* (Re-)Connect vma, with specified prot. */
#define PR_PTHREADEXIT        17 /* Kill a pthread, only for IRIX 6.[234] */

asmlinkage int irix_prctl(unsigned option, ...)
{
      va_list args;
      int error = 0;

      va_start(args, option);
      switch (option) {
      case PR_MAXPROCS:
            printk("irix_prctl[%s:%d]: Wants PR_MAXPROCS\n",
                   current->comm, current->pid);
            error = max_threads;
            break;

      case PR_ISBLOCKED: {
            struct task_struct *task;

            printk("irix_prctl[%s:%d]: Wants PR_ISBLOCKED\n",
                   current->comm, current->pid);
            read_lock(&tasklist_lock);
            task = find_task_by_pid(va_arg(args, pid_t));
            error = -ESRCH;
            if (error)
                  error = (task->run_list.next != NULL);
            read_unlock(&tasklist_lock);
            /* Can _your_ OS find this out that fast? */
            break;
      }

      case PR_SETSTACKSIZE: {
            long value = va_arg(args, long);

            printk("irix_prctl[%s:%d]: Wants PR_SETSTACKSIZE<%08lx>\n",
                   current->comm, current->pid, (unsigned long) value);
            if (value > RLIM_INFINITY)
                  value = RLIM_INFINITY;
            if (capable(CAP_SYS_ADMIN)) {
                  task_lock(current->group_leader);
                  current->signal->rlim[RLIMIT_STACK].rlim_max =
                        current->signal->rlim[RLIMIT_STACK].rlim_cur = value;
                  task_unlock(current->group_leader);
                  error = value;
                  break;
            }
            task_lock(current->group_leader);
            if (value > current->signal->rlim[RLIMIT_STACK].rlim_max) {
                  error = -EINVAL;
                  task_unlock(current->group_leader);
                  break;
            }
            current->signal->rlim[RLIMIT_STACK].rlim_cur = value;
            task_unlock(current->group_leader);
            error = value;
            break;
      }

      case PR_GETSTACKSIZE:
            printk("irix_prctl[%s:%d]: Wants PR_GETSTACKSIZE\n",
                   current->comm, current->pid);
            error = current->signal->rlim[RLIMIT_STACK].rlim_cur;
            break;

      case PR_MAXPPROCS:
            printk("irix_prctl[%s:%d]: Wants PR_MAXPROCS\n",
                   current->comm, current->pid);
            error = 1;
            break;

      case PR_UNBLKONEXEC:
            printk("irix_prctl[%s:%d]: Wants PR_UNBLKONEXEC\n",
                   current->comm, current->pid);
            error = -EINVAL;
            break;

      case PR_SETEXITSIG:
            printk("irix_prctl[%s:%d]: Wants PR_SETEXITSIG\n",
                   current->comm, current->pid);

            /* We can probably play some game where we set the task
             * exit_code to some non-zero value when this is requested,
             * and check whether exit_code is already set in do_exit().
             */
            error = -EINVAL;
            break;

      case PR_RESIDENT:
            printk("irix_prctl[%s:%d]: Wants PR_RESIDENT\n",
                   current->comm, current->pid);
            error = 0; /* Compatibility indeed. */
            break;

      case PR_ATTACHADDR:
            printk("irix_prctl[%s:%d]: Wants PR_ATTACHADDR\n",
                   current->comm, current->pid);
            error = -EINVAL;
            break;

      case PR_DETACHADDR:
            printk("irix_prctl[%s:%d]: Wants PR_DETACHADDR\n",
                   current->comm, current->pid);
            error = -EINVAL;
            break;

      case PR_TERMCHILD:
            printk("irix_prctl[%s:%d]: Wants PR_TERMCHILD\n",
                   current->comm, current->pid);
            error = -EINVAL;
            break;

      case PR_GETSHMASK:
            printk("irix_prctl[%s:%d]: Wants PR_GETSHMASK\n",
                   current->comm, current->pid);
            error = -EINVAL; /* Until I have the sproc() stuff in. */
            break;

      case PR_GETNSHARE:
            error = 0;       /* Until I have the sproc() stuff in. */
            break;

      case PR_COREPID:
            printk("irix_prctl[%s:%d]: Wants PR_COREPID\n",
                   current->comm, current->pid);
            error = -EINVAL;
            break;

      case PR_ATTACHADDRPERM:
            printk("irix_prctl[%s:%d]: Wants PR_ATTACHADDRPERM\n",
                   current->comm, current->pid);
            error = -EINVAL;
            break;

      default:
            printk("irix_prctl[%s:%d]: Non-existant opcode %d\n",
                   current->comm, current->pid, option);
            error = -EINVAL;
            break;
      }
      va_end(args);

      return error;
}

#undef DEBUG_PROCGRPS

extern unsigned long irix_mapelf(int fd, struct elf_phdr __user *user_phdrp, int cnt);
extern char *prom_getenv(char *name);
extern long prom_setenv(char *name, char *value);

/* The syssgi commands supported thus far. */
#define SGI_SYSID         1       /* Return unique per-machine identifier. */
#define SGI_INVENT        5       /* Fetch inventory  */
#   define SGI_INV_SIZEOF 1
#   define SGI_INV_READ   2
#define SGI_RDNAME        6       /* Return string name of a process. */
#define SGI_SETNVRAM      8     /* Set PROM variable. */
#define SGI_GETNVRAM      9     /* Get PROM variable. */
#define SGI_SETPGID      21       /* Set process group id. */
#define SGI_SYSCONF      22       /* POSIX sysconf garbage. */
#define SGI_PATHCONF     24       /* POSIX sysconf garbage. */
#define SGI_SETGROUPS    40       /* POSIX sysconf garbage. */
#define SGI_GETGROUPS    41       /* POSIX sysconf garbage. */
#define SGI_RUSAGE       56       /* BSD style rusage(). */
#define SGI_SSYNC        62       /* Synchronous fs sync. */
#define SGI_GETSID       65       /* SysVr4 get session id. */
#define SGI_ELFMAP       68       /* Map an elf image. */
#define SGI_TOSSTSAVE   108       /* Toss saved vma's. */
#define SGI_FP_BCOPY    129       /* Should FPU bcopy be used on this machine? */
#define SGI_PHYSP      1011       /* Translate virtual into physical page. */

asmlinkage int irix_syssgi(struct pt_regs *regs)
{
      unsigned long cmd;
      int retval, base = 0;

      if (regs->regs[2] == 1000)
            base = 1;

      cmd = regs->regs[base + 4];
      switch(cmd) {
      case SGI_SYSID: {
            char __user *buf = (char __user *) regs->regs[base + 5];

            /* XXX Use ethernet addr.... */
            retval = clear_user(buf, 64) ? -EFAULT : 0;
            break;
      }
#if 0
      case SGI_RDNAME: {
            int pid = (int) regs->regs[base + 5];
            char __user *buf = (char __user *) regs->regs[base + 6];
            struct task_struct *p;
            char tcomm[sizeof(current->comm)];

            read_lock(&tasklist_lock);
            p = find_task_by_pid(pid);
            if (!p) {
                  read_unlock(&tasklist_lock);
                  retval = -ESRCH;
                  break;
            }
            get_task_comm(tcomm, p);
            read_unlock(&tasklist_lock);

            /* XXX Need to check sizes. */
            retval = copy_to_user(buf, tcomm, sizeof(tcomm)) ? -EFAULT : 0;
            break;
      }

      case SGI_GETNVRAM: {
            char __user *name = (char __user *) regs->regs[base+5];
            char __user *buf = (char __user *) regs->regs[base+6];
            char *value;
            return -EINVAL;   /* til I fix it */
            value = prom_getenv(name);    /* PROM lock?  */
            if (!value) {
                  retval = -EINVAL;
                  break;
            }
            /* Do I strlen() for the length? */
            retval = copy_to_user(buf, value, 128) ? -EFAULT : 0;
            break;
      }

      case SGI_SETNVRAM: {
            char __user *name = (char __user *) regs->regs[base+5];
            char __user *value = (char __user *) regs->regs[base+6];
            return -EINVAL;   /* til I fix it */
            retval = prom_setenv(name, value);
            /* XXX make sure retval conforms to syssgi(2) */
            printk("[%s:%d] setnvram(\"%s\", \"%s\"): retval %d",
                   current->comm, current->pid, name, value, retval);
/*          if (retval == PROM_ENOENT)
                  retval = -ENOENT; */
            break;
      }
#endif

      case SGI_SETPGID: {
#ifdef DEBUG_PROCGRPS
            printk("[%s:%d] setpgid(%d, %d) ",
                   current->comm, current->pid,
                   (int) regs->regs[base + 5], (int)regs->regs[base + 6]);
#endif
            retval = sys_setpgid(regs->regs[base + 5], regs->regs[base + 6]);

#ifdef DEBUG_PROCGRPS
            printk("retval=%d\n", retval);
#endif
      }

      case SGI_SYSCONF: {
            switch(regs->regs[base + 5]) {
            case 1:
                  retval = (MAX_ARG_PAGES >> 4); /* XXX estimate... */
                  goto out;
            case 2:
                  retval = max_threads;
                  goto out;
            case 3:
                  retval = HZ;
                  goto out;
            case 4:
                  retval = NGROUPS_MAX;
                  goto out;
            case 5:
                  retval = NR_OPEN;
                  goto out;
            case 6:
                  retval = 1;
                  goto out;
            case 7:
                  retval = 1;
                  goto out;
            case 8:
                  retval = 199009;
                  goto out;
            case 11:
                  retval = PAGE_SIZE;
                  goto out;
            case 12:
                  retval = 4;
                  goto out;
            case 25:
            case 26:
            case 27:
            case 28:
            case 29:
            case 30:
                  retval = 0;
                  goto out;
            case 31:
                  retval = 32;
                  goto out;
            default:
                  retval = -EINVAL;
                  goto out;
            };
      }

      case SGI_SETGROUPS:
            retval = sys_setgroups((int) regs->regs[base + 5],
                                   (gid_t __user *) regs->regs[base + 6]);
            break;

      case SGI_GETGROUPS:
            retval = sys_getgroups((int) regs->regs[base + 5],
                                   (gid_t __user *) regs->regs[base + 6]);
            break;

      case SGI_RUSAGE: {
            struct rusage __user *ru = (struct rusage __user *) regs->regs[base + 6];

            switch((int) regs->regs[base + 5]) {
            case 0:
                  /* rusage self */
                  retval = getrusage(current, RUSAGE_SELF, ru);
                  goto out;

            case -1:
                  /* rusage children */
                  retval = getrusage(current, RUSAGE_CHILDREN, ru);
                  goto out;

            default:
                  retval = -EINVAL;
                  goto out;
            };
      }

      case SGI_SSYNC:
            sys_sync();
            retval = 0;
            break;

      case SGI_GETSID:
#ifdef DEBUG_PROCGRPS
            printk("[%s:%d] getsid(%d) ", current->comm, current->pid,
                   (int) regs->regs[base + 5]);
#endif
            retval = sys_getsid(regs->regs[base + 5]);
#ifdef DEBUG_PROCGRPS
            printk("retval=%d\n", retval);
#endif
            break;

      case SGI_ELFMAP:
            retval = irix_mapelf((int) regs->regs[base + 5],
                             (struct elf_phdr __user *) regs->regs[base + 6],
                             (int) regs->regs[base + 7]);
            break;

      case SGI_TOSSTSAVE:
            /* XXX We don't need to do anything? */
            retval = 0;
            break;

      case SGI_FP_BCOPY:
            retval = 0;
            break;

      case SGI_PHYSP: {
            unsigned long addr = regs->regs[base + 5];
            int __user *pageno = (int __user *) (regs->regs[base + 6]);
            struct mm_struct *mm = current->mm;
            pgd_t *pgdp;
            pud_t *pudp;
            pmd_t *pmdp;
            pte_t *ptep;

            down_read(&mm->mmap_sem);
            pgdp = pgd_offset(mm, addr);
            pudp = pud_offset(pgdp, addr);
            pmdp = pmd_offset(pudp, addr);
            ptep = pte_offset(pmdp, addr);
            retval = -EINVAL;
            if (ptep) {
                  pte_t pte = *ptep;

                  if (pte_val(pte) & (_PAGE_VALID | _PAGE_PRESENT)) {
                        /* b0rked on 64-bit */
                        retval =  put_user((pte_val(pte) & PAGE_MASK) >>
                                           PAGE_SHIFT, pageno);
                  }
            }
            up_read(&mm->mmap_sem);
            break;
      }

      case SGI_INVENT: {
            int  arg1    = (int)    regs->regs [base + 5];
            void __user *buffer = (void __user *) regs->regs [base + 6];
            int  count   = (int)    regs->regs [base + 7];

            switch (arg1) {
            case SGI_INV_SIZEOF:
                  retval = sizeof(inventory_t);
                  break;
            case SGI_INV_READ:
                  retval = dump_inventory_to_user(buffer, count);
                  break;
            default:
                  retval = -EINVAL;
            }
            break;
      }

      default:
            printk("irix_syssgi: Unsupported command %d\n", (int)cmd);
            retval = -EINVAL;
            break;
      };

out:
      return retval;
}

asmlinkage int irix_gtime(struct pt_regs *regs)
{
      return get_seconds();
}

/*
 * IRIX is completely broken... it returns 0 on success, otherwise
 * ENOMEM.
 */
asmlinkage int irix_brk(unsigned long brk)
{
      unsigned long rlim;
      unsigned long newbrk, oldbrk;
      struct mm_struct *mm = current->mm;
      int ret;

      down_write(&mm->mmap_sem);
      if (brk < mm->end_code) {
            ret = -ENOMEM;
            goto out;
      }

      newbrk = PAGE_ALIGN(brk);
      oldbrk = PAGE_ALIGN(mm->brk);
      if (oldbrk == newbrk) {
            mm->brk = brk;
            ret = 0;
            goto out;
      }

      /*
       * Always allow shrinking brk
       */
      if (brk <= mm->brk) {
            mm->brk = brk;
            do_munmap(mm, newbrk, oldbrk-newbrk);
            ret = 0;
            goto out;
      }
      /*
       * Check against rlimit and stack..
       */
      rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur;
      if (rlim >= RLIM_INFINITY)
            rlim = ~0;
      if (brk - mm->end_code > rlim) {
            ret = -ENOMEM;
            goto out;
      }

      /*
       * Check against existing mmap mappings.
       */
      if (find_vma_intersection(mm, oldbrk, newbrk+PAGE_SIZE)) {
            ret = -ENOMEM;
            goto out;
      }

      /*
       * Ok, looks good - let it rip.
       */
      if (do_brk(oldbrk, newbrk-oldbrk) != oldbrk) {
            ret = -ENOMEM;
            goto out;
      }
      mm->brk = brk;
      ret = 0;

out:
      up_write(&mm->mmap_sem);
      return ret;
}

asmlinkage int irix_getpid(struct pt_regs *regs)
{
      regs->regs[3] = current->real_parent->pid;
      return current->pid;
}

asmlinkage int irix_getuid(struct pt_regs *regs)
{
      regs->regs[3] = current->euid;
      return current->uid;
}

asmlinkage int irix_getgid(struct pt_regs *regs)
{
      regs->regs[3] = current->egid;
      return current->gid;
}

asmlinkage int irix_stime(int value)
{
      int err;
      struct timespec tv;

      tv.tv_sec = value;
      tv.tv_nsec = 0;
      err = security_settime(&tv, NULL);
      if (err)
            return err;

      write_seqlock_irq(&xtime_lock);
      xtime.tv_sec = value;
      xtime.tv_nsec = 0;
      ntp_clear();
      write_sequnlock_irq(&xtime_lock);

      return 0;
}

static inline void jiffiestotv(unsigned long jiffies, struct timeval *value)
{
      value->tv_usec = (jiffies % HZ) * (1000000 / HZ);
      value->tv_sec = jiffies / HZ;
}

static inline void getitimer_real(struct itimerval *value)
{
      register unsigned long val, interval;

      interval = current->it_real_incr;
      val = 0;
      if (del_timer(&current->real_timer)) {
            unsigned long now = jiffies;
            val = current->real_timer.expires;
            add_timer(&current->real_timer);
            /* look out for negative/zero itimer.. */
            if (val <= now)
                  val = now+1;
            val -= now;
      }
      jiffiestotv(val, &value->it_value);
      jiffiestotv(interval, &value->it_interval);
}

asmlinkage unsigned int irix_alarm(unsigned int seconds)
{
      return alarm_setitimer(seconds);
}

asmlinkage int irix_pause(void)
{
      current->state = TASK_INTERRUPTIBLE;
      schedule();

      return -EINTR;
}

/* XXX need more than this... */
asmlinkage int irix_mount(char __user *dev_name, char __user *dir_name,
      unsigned long flags, char __user *type, void __user *data, int datalen)
{
      printk("[%s:%d] irix_mount(%p,%p,%08lx,%p,%p,%d)\n",
             current->comm, current->pid,
             dev_name, dir_name, flags, type, data, datalen);

      return sys_mount(dev_name, dir_name, type, flags, data);
}

struct irix_statfs {
      short f_type;
      long  f_bsize, f_frsize, f_blocks, f_bfree, f_files, f_ffree;
      char  f_fname[6], f_fpack[6];
};

asmlinkage int irix_statfs(const char __user *path,
      struct irix_statfs __user *buf, int len, int fs_type)
{
      struct nameidata nd;
      struct kstatfs kbuf;
      int error, i;

      /* We don't support this feature yet. */
      if (fs_type) {
            error = -EINVAL;
            goto out;
      }
      if (!access_ok(VERIFY_WRITE, buf, sizeof(struct irix_statfs))) {
            error = -EFAULT;
            goto out;
      }

      error = user_path_walk(path, &nd);
      if (error)
            goto out;

      error = vfs_statfs(nd.dentry, &kbuf);
      if (error)
            goto dput_and_out;

      error = __put_user(kbuf.f_type, &buf->f_type);
      error |= __put_user(kbuf.f_bsize, &buf->f_bsize);
      error |= __put_user(kbuf.f_frsize, &buf->f_frsize);
      error |= __put_user(kbuf.f_blocks, &buf->f_blocks);
      error |= __put_user(kbuf.f_bfree, &buf->f_bfree);
      error |= __put_user(kbuf.f_files, &buf->f_files);
      error |= __put_user(kbuf.f_ffree, &buf->f_ffree);
      for (i = 0; i < 6; i++) {
            error |= __put_user(0, &buf->f_fname[i]);
            error |= __put_user(0, &buf->f_fpack[i]);
      }

dput_and_out:
      path_release(&nd);
out:
      return error;
}

asmlinkage int irix_fstatfs(unsigned int fd, struct irix_statfs __user *buf)
{
      struct kstatfs kbuf;
      struct file *file;
      int error, i;

      if (!access_ok(VERIFY_WRITE, buf, sizeof(struct irix_statfs))) {
            error = -EFAULT;
            goto out;
      }

      if (!(file = fget(fd))) {
            error = -EBADF;
            goto out;
      }

      error = vfs_statfs(file->f_path.dentry, &kbuf);
      if (error)
            goto out_f;

      error = __put_user(kbuf.f_type, &buf->f_type);
      error |= __put_user(kbuf.f_bsize, &buf->f_bsize);
      error |= __put_user(kbuf.f_frsize, &buf->f_frsize);
      error |= __put_user(kbuf.f_blocks, &buf->f_blocks);
      error |= __put_user(kbuf.f_bfree, &buf->f_bfree);
      error |= __put_user(kbuf.f_files, &buf->f_files);
      error |= __put_user(kbuf.f_ffree, &buf->f_ffree);

      for (i = 0; i < 6; i++) {
            error |= __put_user(0, &buf->f_fname[i]);
            error |= __put_user(0, &buf->f_fpack[i]);
      }

out_f:
      fput(file);
out:
      return error;
}

asmlinkage int irix_setpgrp(int flags)
{
      int error;

#ifdef DEBUG_PROCGRPS
      printk("[%s:%d] setpgrp(%d) ", current->comm, current->pid, flags);
#endif
      if(!flags)
            error = task_pgrp_nr(current);
      else
            error = sys_setsid();
#ifdef DEBUG_PROCGRPS
      printk("returning %d\n", task_pgrp_nr(current));
#endif

      return error;
}

asmlinkage int irix_times(struct tms __user *tbuf)
{
      int err = 0;

      if (tbuf) {
            if (!access_ok(VERIFY_WRITE, tbuf, sizeof *tbuf))
                  return -EFAULT;

            err = __put_user(current->utime, &tbuf->tms_utime);
            err |= __put_user(current->stime, &tbuf->tms_stime);
            err |= __put_user(current->signal->cutime, &tbuf->tms_cutime);
            err |= __put_user(current->signal->cstime, &tbuf->tms_cstime);
      }

      return err;
}

asmlinkage int irix_exec(struct pt_regs *regs)
{
      int error, base = 0;
      char *filename;

      if(regs->regs[2] == 1000)
            base = 1;
      filename = getname((char __user *) (long)regs->regs[base + 4]);
      error = PTR_ERR(filename);
      if (IS_ERR(filename))
            return error;

      error = do_execve(filename, (char __user * __user *) (long)regs->regs[base + 5],
                        NULL, regs);
      putname(filename);

      return error;
}

asmlinkage int irix_exece(struct pt_regs *regs)
{
      int error, base = 0;
      char *filename;

      if (regs->regs[2] == 1000)
            base = 1;
      filename = getname((char __user *) (long)regs->regs[base + 4]);
      error = PTR_ERR(filename);
      if (IS_ERR(filename))
            return error;
      error = do_execve(filename, (char __user * __user *) (long)regs->regs[base + 5],
                        (char __user * __user *) (long)regs->regs[base + 6], regs);
      putname(filename);

      return error;
}

asmlinkage unsigned long irix_gethostid(void)
{
      printk("[%s:%d]: irix_gethostid() called...\n",
             current->comm, current->pid);

      return -EINVAL;
}

asmlinkage unsigned long irix_sethostid(unsigned long val)
{
      printk("[%s:%d]: irix_sethostid(%08lx) called...\n",
             current->comm, current->pid, val);

      return -EINVAL;
}

asmlinkage int irix_socket(int family, int type, int protocol)
{
      switch(type) {
      case 1:
            type = SOCK_DGRAM;
            break;

      case 2:
            type = SOCK_STREAM;
            break;

      case 3:
            type = 9; /* Invalid... */
            break;

      case 4:
            type = SOCK_RAW;
            break;

      case 5:
            type = SOCK_RDM;
            break;

      case 6:
            type = SOCK_SEQPACKET;
            break;

      default:
            break;
      }

      return sys_socket(family, type, protocol);
}

asmlinkage int irix_getdomainname(char __user *name, int len)
{
      int err;

      down_read(&uts_sem);
      if (len > __NEW_UTS_LEN)
            len = __NEW_UTS_LEN;
      err = copy_to_user(name, utsname()->domainname, len) ? -EFAULT : 0;
      up_read(&uts_sem);

      return err;
}

asmlinkage unsigned long irix_getpagesize(void)
{
      return PAGE_SIZE;
}

asmlinkage int irix_msgsys(int opcode, unsigned long arg0, unsigned long arg1,
                     unsigned long arg2, unsigned long arg3,
                     unsigned long arg4)
{
      switch (opcode) {
      case 0:
            return sys_msgget((key_t) arg0, (int) arg1);
      case 1:
            return sys_msgctl((int) arg0, (int) arg1,
                              (struct msqid_ds __user *)arg2);
      case 2:
            return sys_msgrcv((int) arg0, (struct msgbuf __user *) arg1,
                          (size_t) arg2, (long) arg3, (int) arg4);
      case 3:
            return sys_msgsnd((int) arg0, (struct msgbuf __user *) arg1,
                          (size_t) arg2, (int) arg3);
      default:
            return -EINVAL;
      }
}

asmlinkage int irix_shmsys(int opcode, unsigned long arg0, unsigned long arg1,
                     unsigned long arg2, unsigned long arg3)
{
      switch (opcode) {
      case 0:
            return do_shmat((int) arg0, (char __user *) arg1, (int) arg2,
                         (unsigned long *) arg3);
      case 1:
            return sys_shmctl((int)arg0, (int)arg1,
                              (struct shmid_ds __user *)arg2);
      case 2:
            return sys_shmdt((char __user *)arg0);
      case 3:
            return sys_shmget((key_t) arg0, (int) arg1, (int) arg2);
      default:
            return -EINVAL;
      }
}

asmlinkage int irix_semsys(int opcode, unsigned long arg0, unsigned long arg1,
                     unsigned long arg2, int arg3)
{
      switch (opcode) {
      case 0:
            return sys_semctl((int) arg0, (int) arg1, (int) arg2,
                          (union semun) arg3);
      case 1:
            return sys_semget((key_t) arg0, (int) arg1, (int) arg2);
      case 2:
            return sys_semop((int) arg0, (struct sembuf __user *)arg1,
                         (unsigned int) arg2);
      default:
            return -EINVAL;
      }
}

static inline loff_t llseek(struct file *file, loff_t offset, int origin)
{
      loff_t (*fn)(struct file *, loff_t, int);
      loff_t retval;

      fn = default_llseek;
      if (file->f_op && file->f_op->llseek)
      fn = file->f_op->llseek;
      lock_kernel();
      retval = fn(file, offset, origin);
      unlock_kernel();

      return retval;
}

asmlinkage int irix_lseek64(int fd, int _unused, int offhi, int offlow,
                            int origin)
{
      struct file * file;
      loff_t offset;
      int retval;

      retval = -EBADF;
      file = fget(fd);
      if (!file)
            goto bad;
      retval = -EINVAL;
      if (origin > 2)
            goto out_putf;

      offset = llseek(file, ((loff_t) offhi << 32) | offlow, origin);
      retval = (int) offset;

out_putf:
      fput(file);
bad:
      return retval;
}

asmlinkage int irix_sginap(int ticks)
{
      schedule_timeout_interruptible(ticks);
      return 0;
}

asmlinkage int irix_sgikopt(char __user *istring, char __user *ostring, int len)
{
      return -EINVAL;
}

asmlinkage int irix_gettimeofday(struct timeval __user *tv)
{
      time_t sec;
      long nsec, seq;
      int err;

      if (!access_ok(VERIFY_WRITE, tv, sizeof(struct timeval)))
            return -EFAULT;

      do {
            seq = read_seqbegin(&xtime_lock);
            sec = xtime.tv_sec;
            nsec = xtime.tv_nsec;
      } while (read_seqretry(&xtime_lock, seq));

      err = __put_user(sec, &tv->tv_sec);
      err |= __put_user((nsec / 1000), &tv->tv_usec);

      return err;
}

#define IRIX_MAP_AUTOGROW 0x40

asmlinkage unsigned long irix_mmap32(unsigned long addr, size_t len, int prot,
                             int flags, int fd, off_t offset)
{
      struct file *file = NULL;
      unsigned long retval;

      if (!(flags & MAP_ANONYMOUS)) {
            if (!(file = fget(fd)))
                  return -EBADF;

            /* Ok, bad taste hack follows, try to think in something else
             * when reading this.  */
            if (flags & IRIX_MAP_AUTOGROW) {
                  unsigned long old_pos;
                  long max_size = offset + len;

                  if (max_size > file->f_path.dentry->d_inode->i_size) {
                        old_pos = sys_lseek(fd, max_size - 1, 0);
                        sys_write(fd, (void __user *) "", 1);
                        sys_lseek(fd, old_pos, 0);
                  }
            }
      }

      flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);

      down_write(&current->mm->mmap_sem);
      retval = do_mmap(file, addr, len, prot, flags, offset);
      up_write(&current->mm->mmap_sem);
      if (file)
            fput(file);

      return retval;
}

asmlinkage int irix_madvise(unsigned long addr, int len, int behavior)
{
      printk("[%s:%d] Wheee.. irix_madvise(%08lx,%d,%d)\n",
             current->comm, current->pid, addr, len, behavior);

      return -EINVAL;
}

asmlinkage int irix_pagelock(char __user *addr, int len, int op)
{
      printk("[%s:%d] Wheee.. irix_pagelock(%p,%d,%d)\n",
             current->comm, current->pid, addr, len, op);

      return -EINVAL;
}

asmlinkage int irix_quotactl(struct pt_regs *regs)
{
      printk("[%s:%d] Wheee.. irix_quotactl()\n",
             current->comm, current->pid);

      return -EINVAL;
}

asmlinkage int irix_BSDsetpgrp(int pid, int pgrp)
{
      int error;

#ifdef DEBUG_PROCGRPS
      printk("[%s:%d] BSDsetpgrp(%d, %d) ", current->comm, current->pid,
             pid, pgrp);
#endif
      if(!pid)
            pid = current->pid;

      /* Wheee, weird sysv thing... */
      if ((pgrp == 0) && (pid == current->pid))
            error = sys_setsid();
      else
            error = sys_setpgid(pid, pgrp);

#ifdef DEBUG_PROCGRPS
      printk("error = %d\n", error);
#endif

      return error;
}

asmlinkage int irix_systeminfo(int cmd, char __user *buf, int cnt)
{
      printk("[%s:%d] Wheee.. irix_systeminfo(%d,%p,%d)\n",
             current->comm, current->pid, cmd, buf, cnt);

      return -EINVAL;
}

struct iuname {
      char sysname[257], nodename[257], release[257];
      char version[257], machine[257];
      char m_type[257], base_rel[257];
      char _unused0[257], _unused1[257], _unused2[257];
      char _unused3[257], _unused4[257], _unused5[257];
};

asmlinkage int irix_uname(struct iuname __user *buf)
{
      down_read(&uts_sem);
      if (copy_from_user(utsname()->sysname, buf->sysname, 65)
          || copy_from_user(utsname()->nodename, buf->nodename, 65)
          || copy_from_user(utsname()->release, buf->release, 65)
          || copy_from_user(utsname()->version, buf->version, 65)
          || copy_from_user(utsname()->machine, buf->machine, 65)) {
            return -EFAULT;
      }
      up_read(&uts_sem);

      return 1;
}

#undef DEBUG_XSTAT

static int irix_xstat32_xlate(struct kstat *stat, void __user *ubuf)
{
      struct xstat32 {
            u32 st_dev, st_pad1[3], st_ino, st_mode, st_nlink, st_uid, st_gid;
            u32 st_rdev, st_pad2[2], st_size, st_pad3;
            u32 st_atime0, st_atime1;
            u32 st_mtime0, st_mtime1;
            u32 st_ctime0, st_ctime1;
            u32 st_blksize, st_blocks;
            char st_fstype[16];
            u32 st_pad4[8];
      } ub;

      if (!sysv_valid_dev(stat->dev) || !sysv_valid_dev(stat->rdev))
            return -EOVERFLOW;
      ub.st_dev     = sysv_encode_dev(stat->dev);
      ub.st_ino     = stat->ino;
      ub.st_mode    = stat->mode;
      ub.st_nlink   = stat->nlink;
      SET_UID(ub.st_uid, stat->uid);
      SET_GID(ub.st_gid, stat->gid);
      ub.st_rdev    = sysv_encode_dev(stat->rdev);
#if BITS_PER_LONG == 32
      if (stat->size > MAX_NON_LFS)
            return -EOVERFLOW;
#endif
      ub.st_size    = stat->size;
      ub.st_atime0  = stat->atime.tv_sec;
      ub.st_atime1  = stat->atime.tv_nsec;
      ub.st_mtime0  = stat->mtime.tv_sec;
      ub.st_mtime1  = stat->atime.tv_nsec;
      ub.st_ctime0  = stat->ctime.tv_sec;
      ub.st_ctime1  = stat->atime.tv_nsec;
      ub.st_blksize = stat->blksize;
      ub.st_blocks  = stat->blocks;
      strcpy(ub.st_fstype, "efs");

      return copy_to_user(ubuf, &ub, sizeof(ub)) ? -EFAULT : 0;
}

static int irix_xstat64_xlate(struct kstat *stat, void __user *ubuf)
{
      struct xstat64 {
            u32 st_dev; s32 st_pad1[3];
            unsigned long long st_ino;
            u32 st_mode;
            u32 st_nlink; s32 st_uid; s32 st_gid; u32 st_rdev;
            s32 st_pad2[2];
            long long st_size;
            s32 st_pad3;
            struct { s32 tv_sec, tv_nsec; } st_atime, st_mtime, st_ctime;
            s32 st_blksize;
            long long  st_blocks;
            char st_fstype[16];
            s32 st_pad4[8];
      } ks;

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

      ks.st_dev = sysv_encode_dev(stat->dev);
      ks.st_pad1[0] = ks.st_pad1[1] = ks.st_pad1[2] = 0;
      ks.st_ino = (unsigned long long) stat->ino;
      ks.st_mode = (u32) stat->mode;
      ks.st_nlink = (u32) stat->nlink;
      ks.st_uid = (s32) stat->uid;
      ks.st_gid = (s32) stat->gid;
      ks.st_rdev = sysv_encode_dev(stat->rdev);
      ks.st_pad2[0] = ks.st_pad2[1] = 0;
      ks.st_size = (long long) stat->size;
      ks.st_pad3 = 0;

      /* XXX hackety hack... */
      ks.st_atime.tv_sec = (s32) stat->atime.tv_sec;
      ks.st_atime.tv_nsec = stat->atime.tv_nsec;
      ks.st_mtime.tv_sec = (s32) stat->mtime.tv_sec;
      ks.st_mtime.tv_nsec = stat->mtime.tv_nsec;
      ks.st_ctime.tv_sec = (s32) stat->ctime.tv_sec;
      ks.st_ctime.tv_nsec = stat->ctime.tv_nsec;

      ks.st_blksize = (s32) stat->blksize;
      ks.st_blocks = (long long) stat->blocks;
      memset(ks.st_fstype, 0, 16);
      ks.st_pad4[0] = ks.st_pad4[1] = ks.st_pad4[2] = ks.st_pad4[3] = 0;
      ks.st_pad4[4] = ks.st_pad4[5] = ks.st_pad4[6] = ks.st_pad4[7] = 0;

      /* Now write it all back. */
      return copy_to_user(ubuf, &ks, sizeof(ks)) ? -EFAULT : 0;
}

asmlinkage int irix_xstat(int version, char __user *filename, struct stat __user *statbuf)
{
      int retval;
      struct kstat stat;

#ifdef DEBUG_XSTAT
      printk("[%s:%d] Wheee.. irix_xstat(%d,%s,%p) ",
             current->comm, current->pid, version, filename, statbuf);
#endif

      retval = vfs_stat(filename, &stat);
      if (!retval) {
            switch(version) {
                  case 2:
                        retval = irix_xstat32_xlate(&stat, statbuf);
                        break;
                  case 3:
                        retval = irix_xstat64_xlate(&stat, statbuf);
                        break;
                  default:
                        retval = -EINVAL;
            }
      }
      return retval;
}

asmlinkage int irix_lxstat(int version, char __user *filename, struct stat __user *statbuf)
{
      int error;
      struct kstat stat;

#ifdef DEBUG_XSTAT
      printk("[%s:%d] Wheee.. irix_lxstat(%d,%s,%p) ",
             current->comm, current->pid, version, filename, statbuf);
#endif

      error = vfs_lstat(filename, &stat);

      if (!error) {
            switch (version) {
                  case 2:
                        error = irix_xstat32_xlate(&stat, statbuf);
                        break;
                  case 3:
                        error = irix_xstat64_xlate(&stat, statbuf);
                        break;
                  default:
                        error = -EINVAL;
            }
      }
      return error;
}

asmlinkage int irix_fxstat(int version, int fd, struct stat __user *statbuf)
{
      int error;
      struct kstat stat;

#ifdef DEBUG_XSTAT
      printk("[%s:%d] Wheee.. irix_fxstat(%d,%d,%p) ",
             current->comm, current->pid, version, fd, statbuf);
#endif

      error = vfs_fstat(fd, &stat);
      if (!error) {
            switch (version) {
                  case 2:
                        error = irix_xstat32_xlate(&stat, statbuf);
                        break;
                  case 3:
                        error = irix_xstat64_xlate(&stat, statbuf);
                        break;
                  default:
                        error = -EINVAL;
            }
      }
      return error;
}

asmlinkage int irix_xmknod(int ver, char __user *filename, int mode, unsigned dev)
{
      int retval;
      printk("[%s:%d] Wheee.. irix_xmknod(%d,%s,%x,%x)\n",
             current->comm, current->pid, ver, filename, mode, dev);

      switch(ver) {
      case 2:
            /* shouldn't we convert here as well as on stat()? */
            retval = sys_mknod(filename, mode, dev);
            break;

      default:
            retval = -EINVAL;
            break;
      };

      return retval;
}

asmlinkage int irix_swapctl(int cmd, char __user *arg)
{
      printk("[%s:%d] Wheee.. irix_swapctl(%d,%p)\n",
             current->comm, current->pid, cmd, arg);

      return -EINVAL;
}

struct irix_statvfs {
      u32 f_bsize; u32 f_frsize; u32 f_blocks;
      u32 f_bfree; u32 f_bavail; u32 f_files; u32 f_ffree; u32 f_favail;
      u32 f_fsid; char f_basetype[16];
      u32 f_flag; u32 f_namemax;
      char  f_fstr[32]; u32 f_filler[16];
};

asmlinkage int irix_statvfs(char __user *fname, struct irix_statvfs __user *buf)
{
      struct nameidata nd;
      struct kstatfs kbuf;
      int error, i;

      printk("[%s:%d] Wheee.. irix_statvfs(%s,%p)\n",
             current->comm, current->pid, fname, buf);
      if (!access_ok(VERIFY_WRITE, buf, sizeof(struct irix_statvfs)))
            return -EFAULT;

      error = user_path_walk(fname, &nd);
      if (error)
            goto out;
      error = vfs_statfs(nd.dentry, &kbuf);
      if (error)
            goto dput_and_out;

      error |= __put_user(kbuf.f_bsize, &buf->f_bsize);
      error |= __put_user(kbuf.f_frsize, &buf->f_frsize);
      error |= __put_user(kbuf.f_blocks, &buf->f_blocks);
      error |= __put_user(kbuf.f_bfree, &buf->f_bfree);
      error |= __put_user(kbuf.f_bfree, &buf->f_bavail);  /* XXX hackety hack... */
      error |= __put_user(kbuf.f_files, &buf->f_files);
      error |= __put_user(kbuf.f_ffree, &buf->f_ffree);
      error |= __put_user(kbuf.f_ffree, &buf->f_favail);  /* XXX hackety hack... */
#ifdef __MIPSEB__
      error |= __put_user(kbuf.f_fsid.val[1], &buf->f_fsid);
#else
      error |= __put_user(kbuf.f_fsid.val[0], &buf->f_fsid);
#endif
      for (i = 0; i < 16; i++)
            error |= __put_user(0, &buf->f_basetype[i]);
      error |= __put_user(0, &buf->f_flag);
      error |= __put_user(kbuf.f_namelen, &buf->f_namemax);
      for (i = 0; i < 32; i++)
            error |= __put_user(0, &buf->f_fstr[i]);

dput_and_out:
      path_release(&nd);
out:
      return error;
}

asmlinkage int irix_fstatvfs(int fd, struct irix_statvfs __user *buf)
{
      struct kstatfs kbuf;
      struct file *file;
      int error, i;

      printk("[%s:%d] Wheee.. irix_fstatvfs(%d,%p)\n",
             current->comm, current->pid, fd, buf);

      if (!access_ok(VERIFY_WRITE, buf, sizeof(struct irix_statvfs)))
            return -EFAULT;

      if (!(file = fget(fd))) {
            error = -EBADF;
            goto out;
      }
      error = vfs_statfs(file->f_path.dentry, &kbuf);
      if (error)
            goto out_f;

      error = __put_user(kbuf.f_bsize, &buf->f_bsize);
      error |= __put_user(kbuf.f_frsize, &buf->f_frsize);
      error |= __put_user(kbuf.f_blocks, &buf->f_blocks);
      error |= __put_user(kbuf.f_bfree, &buf->f_bfree);
      error |= __put_user(kbuf.f_bfree, &buf->f_bavail); /* XXX hackety hack... */
      error |= __put_user(kbuf.f_files, &buf->f_files);
      error |= __put_user(kbuf.f_ffree, &buf->f_ffree);
      error |= __put_user(kbuf.f_ffree, &buf->f_favail); /* XXX hackety hack... */
#ifdef __MIPSEB__
      error |= __put_user(kbuf.f_fsid.val[1], &buf->f_fsid);
#else
      error |= __put_user(kbuf.f_fsid.val[0], &buf->f_fsid);
#endif
      for(i = 0; i < 16; i++)
            error |= __put_user(0, &buf->f_basetype[i]);
      error |= __put_user(0, &buf->f_flag);
      error |= __put_user(kbuf.f_namelen, &buf->f_namemax);
      error |= __clear_user(&buf->f_fstr, sizeof(buf->f_fstr)) ? -EFAULT : 0;

out_f:
      fput(file);
out:
      return error;
}

asmlinkage int irix_priocntl(struct pt_regs *regs)
{
      printk("[%s:%d] Wheee.. irix_priocntl()\n",
             current->comm, current->pid);

      return -EINVAL;
}

asmlinkage int irix_sigqueue(int pid, int sig, int code, int val)
{
      printk("[%s:%d] Wheee.. irix_sigqueue(%d,%d,%d,%d)\n",
             current->comm, current->pid, pid, sig, code, val);

      return -EINVAL;
}

asmlinkage int irix_truncate64(char __user *name, int pad, int size1, int size2)
{
      int retval;

      if (size1) {
            retval = -EINVAL;
            goto out;
      }
      retval = sys_truncate(name, size2);

out:
      return retval;
}

asmlinkage int irix_ftruncate64(int fd, int pad, int size1, int size2)
{
      int retval;

      if (size1) {
            retval = -EINVAL;
            goto out;
      }
      retval = sys_ftruncate(fd, size2);

out:
      return retval;
}

asmlinkage int irix_mmap64(struct pt_regs *regs)
{
      int len, prot, flags, fd, off1, off2, error, base = 0;
      unsigned long addr, pgoff, *sp;
      struct file *file = NULL;
      int err;

      if (regs->regs[2] == 1000)
            base = 1;
      sp = (unsigned long *) (regs->regs[29] + 16);
      addr = regs->regs[base + 4];
      len = regs->regs[base + 5];
      prot = regs->regs[base + 6];
      if (!base) {
            flags = regs->regs[base + 7];
            if (!access_ok(VERIFY_READ, sp, (4 * sizeof(unsigned long))))
                  return -EFAULT;
            fd = sp[0];
            err = __get_user(off1, &sp[1]);
            err |= __get_user(off2, &sp[2]);
      } else {
            if (!access_ok(VERIFY_READ, sp, (5 * sizeof(unsigned long))))
                  return -EFAULT;
            err = __get_user(flags, &sp[0]);
            err |= __get_user(fd, &sp[1]);
            err |= __get_user(off1, &sp[2]);
            err |= __get_user(off2, &sp[3]);
      }

      if (err)
            return err;

      if (off1 & PAGE_MASK)
            return -EOVERFLOW;

      pgoff = (off1 << (32 - PAGE_SHIFT)) | (off2 >> PAGE_SHIFT);

      if (!(flags & MAP_ANONYMOUS)) {
            if (!(file = fget(fd)))
                  return -EBADF;

            /* Ok, bad taste hack follows, try to think in something else
               when reading this */
            if (flags & IRIX_MAP_AUTOGROW) {
                  unsigned long old_pos;
                  long max_size = off2 + len;

                  if (max_size > file->f_path.dentry->d_inode->i_size) {
                        old_pos = sys_lseek(fd, max_size - 1, 0);
                        sys_write(fd, (void __user *) "", 1);
                        sys_lseek(fd, old_pos, 0);
                  }
            }
      }

      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);

      return error;
}

asmlinkage int irix_dmi(struct pt_regs *regs)
{
      printk("[%s:%d] Wheee.. irix_dmi()\n",
             current->comm, current->pid);

      return -EINVAL;
}

asmlinkage int irix_pread(int fd, char __user *buf, int cnt, int off64,
                    int off1, int off2)
{
      printk("[%s:%d] Wheee.. irix_pread(%d,%p,%d,%d,%d,%d)\n",
             current->comm, current->pid, fd, buf, cnt, off64, off1, off2);

      return -EINVAL;
}

asmlinkage int irix_pwrite(int fd, char __user *buf, int cnt, int off64,
                     int off1, int off2)
{
      printk("[%s:%d] Wheee.. irix_pwrite(%d,%p,%d,%d,%d,%d)\n",
             current->comm, current->pid, fd, buf, cnt, off64, off1, off2);

      return -EINVAL;
}

asmlinkage int irix_sgifastpath(int cmd, unsigned long arg0, unsigned long arg1,
                        unsigned long arg2, unsigned long arg3,
                        unsigned long arg4, unsigned long arg5)
{
      printk("[%s:%d] Wheee.. irix_fastpath(%d,%08lx,%08lx,%08lx,%08lx,"
             "%08lx,%08lx)\n",
             current->comm, current->pid, cmd, arg0, arg1, arg2,
             arg3, arg4, arg5);

      return -EINVAL;
}

struct irix_statvfs64 {
      u32  f_bsize; u32 f_frsize;
      u64  f_blocks; u64 f_bfree; u64 f_bavail;
      u64  f_files; u64 f_ffree; u64 f_favail;
      u32  f_fsid;
      char f_basetype[16];
      u32  f_flag; u32 f_namemax;
      char f_fstr[32];
      u32  f_filler[16];
};

asmlinkage int irix_statvfs64(char __user *fname, struct irix_statvfs64 __user *buf)
{
      struct nameidata nd;
      struct kstatfs kbuf;
      int error, i;

      printk("[%s:%d] Wheee.. irix_statvfs64(%s,%p)\n",
             current->comm, current->pid, fname, buf);
      if (!access_ok(VERIFY_WRITE, buf, sizeof(struct irix_statvfs64))) {
            error = -EFAULT;
            goto out;
      }

      error = user_path_walk(fname, &nd);
      if (error)
            goto out;
      error = vfs_statfs(nd.dentry, &kbuf);
      if (error)
            goto dput_and_out;

      error = __put_user(kbuf.f_bsize, &buf->f_bsize);
      error |= __put_user(kbuf.f_frsize, &buf->f_frsize);
      error |= __put_user(kbuf.f_blocks, &buf->f_blocks);
      error |= __put_user(kbuf.f_bfree, &buf->f_bfree);
      error |= __put_user(kbuf.f_bfree, &buf->f_bavail);  /* XXX hackety hack... */
      error |= __put_user(kbuf.f_files, &buf->f_files);
      error |= __put_user(kbuf.f_ffree, &buf->f_ffree);
      error |= __put_user(kbuf.f_ffree, &buf->f_favail);  /* XXX hackety hack... */
#ifdef __MIPSEB__
      error |= __put_user(kbuf.f_fsid.val[1], &buf->f_fsid);
#else
      error |= __put_user(kbuf.f_fsid.val[0], &buf->f_fsid);
#endif
      for(i = 0; i < 16; i++)
            error |= __put_user(0, &buf->f_basetype[i]);
      error |= __put_user(0, &buf->f_flag);
      error |= __put_user(kbuf.f_namelen, &buf->f_namemax);
      for(i = 0; i < 32; i++)
            error |= __put_user(0, &buf->f_fstr[i]);

dput_and_out:
      path_release(&nd);
out:
      return error;
}

asmlinkage int irix_fstatvfs64(int fd, struct irix_statvfs __user *buf)
{
      struct kstatfs kbuf;
      struct file *file;
      int error, i;

      printk("[%s:%d] Wheee.. irix_fstatvfs64(%d,%p)\n",
             current->comm, current->pid, fd, buf);

      if (!access_ok(VERIFY_WRITE, buf, sizeof(struct irix_statvfs))) {
            error = -EFAULT;
            goto out;
      }
      if (!(file = fget(fd))) {
            error = -EBADF;
            goto out;
      }
      error = vfs_statfs(file->f_path.dentry, &kbuf);
      if (error)
            goto out_f;

      error = __put_user(kbuf.f_bsize, &buf->f_bsize);
      error |= __put_user(kbuf.f_frsize, &buf->f_frsize);
      error |= __put_user(kbuf.f_blocks, &buf->f_blocks);
      error |= __put_user(kbuf.f_bfree, &buf->f_bfree);
      error |= __put_user(kbuf.f_bfree, &buf->f_bavail);  /* XXX hackety hack... */
      error |= __put_user(kbuf.f_files, &buf->f_files);
      error |= __put_user(kbuf.f_ffree, &buf->f_ffree);
      error |= __put_user(kbuf.f_ffree, &buf->f_favail);  /* XXX hackety hack... */
#ifdef __MIPSEB__
      error |= __put_user(kbuf.f_fsid.val[1], &buf->f_fsid);
#else
      error |= __put_user(kbuf.f_fsid.val[0], &buf->f_fsid);
#endif
      for(i = 0; i < 16; i++)
            error |= __put_user(0, &buf->f_basetype[i]);
      error |= __put_user(0, &buf->f_flag);
      error |= __put_user(kbuf.f_namelen, &buf->f_namemax);
      error |= __clear_user(buf->f_fstr, sizeof(buf->f_fstr[i])) ? -EFAULT : 0;

out_f:
      fput(file);
out:
      return error;
}

asmlinkage int irix_getmountid(char __user *fname, unsigned long __user *midbuf)
{
      int err;

      printk("[%s:%d] irix_getmountid(%s, %p)\n",
             current->comm, current->pid, fname, midbuf);
      if (!access_ok(VERIFY_WRITE, midbuf, (sizeof(unsigned long) * 4)))
            return -EFAULT;

      /*
       * The idea with this system call is that when trying to determine
       * 'pwd' and it's a toss-up for some reason, userland can use the
       * fsid of the filesystem to try and make the right decision, but
       * we don't have this so for now. XXX
       */
      err = __put_user(0, &midbuf[0]);
      err |= __put_user(0, &midbuf[1]);
      err |= __put_user(0, &midbuf[2]);
      err |= __put_user(0, &midbuf[3]);

      return err;
}

asmlinkage int irix_nsproc(unsigned long entry, unsigned long mask,
                     unsigned long arg, unsigned long sp, int slen)
{
      printk("[%s:%d] Wheee.. irix_nsproc(%08lx,%08lx,%08lx,%08lx,%d)\n",
             current->comm, current->pid, entry, mask, arg, sp, slen);

      return -EINVAL;
}

#undef DEBUG_GETDENTS

struct irix_dirent32 {
      u32  d_ino;
      u32  d_off;
      unsigned short  d_reclen;
      char d_name[1];
};

struct irix_dirent32_callback {
      struct irix_dirent32 __user *current_dir;
      struct irix_dirent32 __user *previous;
      int count;
      int error;
};

#define NAME_OFFSET32(de) ((int) ((de)->d_name - (char *) (de)))
#define ROUND_UP32(x) (((x)+sizeof(u32)-1) & ~(sizeof(u32)-1))

static int irix_filldir32(void *__buf, const char *name,
      int namlen, loff_t offset, u64 ino, unsigned int d_type)
{
      struct irix_dirent32 __user *dirent;
      struct irix_dirent32_callback *buf = __buf;
      unsigned short reclen = ROUND_UP32(NAME_OFFSET32(dirent) + namlen + 1);
      int err = 0;
      u32 d_ino;

#ifdef DEBUG_GETDENTS
      printk("\nirix_filldir32[reclen<%d>namlen<%d>count<%d>]",
             reclen, namlen, buf->count);
#endif
      buf->error = -EINVAL;   /* only used if we fail.. */
      if (reclen > buf->count)
            return -EINVAL;
      d_ino = ino;
      if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
            return -EOVERFLOW;
      dirent = buf->previous;
      if (dirent)
            err = __put_user(offset, &dirent->d_off);
      dirent = buf->current_dir;
      err |= __put_user(dirent, &buf->previous);
      err |= __put_user(d_ino, &dirent->d_ino);
      err |= __put_user(reclen, &dirent->d_reclen);
      err |= copy_to_user((char __user *)dirent->d_name, name, namlen) ? -EFAULT : 0;
      err |= __put_user(0, &dirent->d_name[namlen]);
      dirent = (struct irix_dirent32 __user *) ((char __user *) dirent + reclen);

      buf->current_dir = dirent;
      buf->count -= reclen;

      return err;
}

asmlinkage int irix_ngetdents(unsigned int fd, void __user * dirent,
      unsigned int count, int __user *eob)
{
      struct file *file;
      struct irix_dirent32 __user *lastdirent;
      struct irix_dirent32_callback buf;
      int error;

#ifdef DEBUG_GETDENTS
      printk("[%s:%d] ngetdents(%d, %p, %d, %p) ", current->comm,
             current->pid, fd, dirent, count, eob);
#endif
      error = -EBADF;
      file = fget(fd);
      if (!file)
            goto out;

      buf.current_dir = (struct irix_dirent32 __user *) dirent;
      buf.previous = NULL;
      buf.count = count;
      buf.error = 0;

      error = vfs_readdir(file, irix_filldir32, &buf);
      if (error < 0)
            goto out_putf;

      error = buf.error;
      lastdirent = buf.previous;
      if (lastdirent) {
            put_user(file->f_pos, &lastdirent->d_off);
            error = count - buf.count;
      }

      if (put_user(0, eob) < 0) {
            error = -EFAULT;
            goto out_putf;
      }

#ifdef DEBUG_GETDENTS
      printk("eob=%d returning %d\n", *eob, count - buf.count);
#endif
      error = count - buf.count;

out_putf:
      fput(file);
out:
      return error;
}

struct irix_dirent64 {
      u64            d_ino;
      u64            d_off;
      unsigned short d_reclen;
      char           d_name[1];
};

struct irix_dirent64_callback {
      struct irix_dirent64 __user *curr;
      struct irix_dirent64 __user *previous;
      int count;
      int error;
};

#define NAME_OFFSET64(de) ((int) ((de)->d_name - (char *) (de)))
#define ROUND_UP64(x) (((x)+sizeof(u64)-1) & ~(sizeof(u64)-1))

static int irix_filldir64(void *__buf, const char *name,
      int namlen, loff_t offset, u64 ino, unsigned int d_type)
{
      struct irix_dirent64 __user *dirent;
      struct irix_dirent64_callback * buf = __buf;
      unsigned short reclen = ROUND_UP64(NAME_OFFSET64(dirent) + namlen + 1);
      int err = 0;

      if (!access_ok(VERIFY_WRITE, buf, sizeof(*buf)))
            return -EFAULT;

      if (__put_user(-EINVAL, &buf->error))     /* only used if we fail.. */
            return -EFAULT;
      if (reclen > buf->count)
            return -EINVAL;
      dirent = buf->previous;
      if (dirent)
            err = __put_user(offset, &dirent->d_off);
      dirent = buf->curr;
      buf->previous = dirent;
      err |= __put_user(ino, &dirent->d_ino);
      err |= __put_user(reclen, &dirent->d_reclen);
      err |= __copy_to_user((char __user *)dirent->d_name, name, namlen)
             ? -EFAULT : 0;
      err |= __put_user(0, &dirent->d_name[namlen]);

      dirent = (struct irix_dirent64 __user *) ((char __user *) dirent + reclen);

      buf->curr = dirent;
      buf->count -= reclen;

      return err;
}

asmlinkage int irix_getdents64(int fd, void __user *dirent, int cnt)
{
      struct file *file;
      struct irix_dirent64 __user *lastdirent;
      struct irix_dirent64_callback buf;
      int error;

#ifdef DEBUG_GETDENTS
      printk("[%s:%d] getdents64(%d, %p, %d) ", current->comm,
             current->pid, fd, dirent, cnt);
#endif
      error = -EBADF;
      if (!(file = fget(fd)))
            goto out;

      error = -EFAULT;
      if (!access_ok(VERIFY_WRITE, dirent, cnt))
            goto out_f;

      error = -EINVAL;
      if (cnt < (sizeof(struct irix_dirent64) + 255))
            goto out_f;

      buf.curr = (struct irix_dirent64 __user *) dirent;
      buf.previous = NULL;
      buf.count = cnt;
      buf.error = 0;
      error = vfs_readdir(file, irix_filldir64, &buf);
      if (error < 0)
            goto out_f;
      lastdirent = buf.previous;
      if (!lastdirent) {
            error = buf.error;
            goto out_f;
      }
      if (put_user(file->f_pos, &lastdirent->d_off))
            return -EFAULT;
#ifdef DEBUG_GETDENTS
      printk("returning %d\n", cnt - buf.count);
#endif
      error = cnt - buf.count;

out_f:
      fput(file);
out:
      return error;
}

asmlinkage int irix_ngetdents64(int fd, void __user *dirent, int cnt, int *eob)
{
      struct file *file;
      struct irix_dirent64 __user *lastdirent;
      struct irix_dirent64_callback buf;
      int error;

#ifdef DEBUG_GETDENTS
      printk("[%s:%d] ngetdents64(%d, %p, %d) ", current->comm,
             current->pid, fd, dirent, cnt);
#endif
      error = -EBADF;
      if (!(file = fget(fd)))
            goto out;

      error = -EFAULT;
      if (!access_ok(VERIFY_WRITE, dirent, cnt) ||
          !access_ok(VERIFY_WRITE, eob, sizeof(*eob)))
            goto out_f;

      error = -EINVAL;
      if (cnt < (sizeof(struct irix_dirent64) + 255))
            goto out_f;

      *eob = 0;
      buf.curr = (struct irix_dirent64 __user *) dirent;
      buf.previous = NULL;
      buf.count = cnt;
      buf.error = 0;
      error = vfs_readdir(file, irix_filldir64, &buf);
      if (error < 0)
            goto out_f;
      lastdirent = buf.previous;
      if (!lastdirent) {
            error = buf.error;
            goto out_f;
      }
      if (put_user(file->f_pos, &lastdirent->d_off))
            return -EFAULT;
#ifdef DEBUG_GETDENTS
      printk("eob=%d returning %d\n", *eob, cnt - buf.count);
#endif
      error = cnt - buf.count;

out_f:
      fput(file);
out:
      return error;
}

asmlinkage int irix_uadmin(unsigned long op, unsigned long func, unsigned long arg)
{
      int retval;

      switch (op) {
      case 1:
            /* Reboot */
            printk("[%s:%d] irix_uadmin: Wants to reboot...\n",
                   current->comm, current->pid);
            retval = -EINVAL;
            goto out;

      case 2:
            /* Shutdown */
            printk("[%s:%d] irix_uadmin: Wants to shutdown...\n",
                   current->comm, current->pid);
            retval = -EINVAL;
            goto out;

      case 4:
            /* Remount-root */
            printk("[%s:%d] irix_uadmin: Wants to remount root...\n",
                   current->comm, current->pid);
            retval = -EINVAL;
            goto out;

      case 8:
            /* Kill all tasks. */
            printk("[%s:%d] irix_uadmin: Wants to kill all tasks...\n",
                   current->comm, current->pid);
            retval = -EINVAL;
            goto out;

      case 256:
            /* Set magic mushrooms... */
            printk("[%s:%d] irix_uadmin: Wants to set magic mushroom[%d]...\n",
                   current->comm, current->pid, (int) func);
            retval = -EINVAL;
            goto out;

      default:
            printk("[%s:%d] irix_uadmin: Unknown operation [%d]...\n",
                   current->comm, current->pid, (int) op);
            retval = -EINVAL;
            goto out;
      };

out:
      return retval;
}

asmlinkage int irix_utssys(char __user *inbuf, int arg, int type, char __user *outbuf)
{
      int retval;

      switch(type) {
      case 0:
            /* uname() */
            retval = irix_uname((struct iuname __user *)inbuf);
            goto out;

      case 2:
            /* ustat() */
            printk("[%s:%d] irix_utssys: Wants to do ustat()\n",
                   current->comm, current->pid);
            retval = -EINVAL;
            goto out;

      case 3:
            /* fusers() */
            printk("[%s:%d] irix_utssys: Wants to do fusers()\n",
                   current->comm, current->pid);
            retval = -EINVAL;
            goto out;

      default:
            printk("[%s:%d] irix_utssys: Wants to do unknown type[%d]\n",
                   current->comm, current->pid, (int) type);
            retval = -EINVAL;
            goto out;
      }

out:
      return retval;
}

#undef DEBUG_FCNTL

#define IRIX_F_ALLOCSP 10

asmlinkage int irix_fcntl(int fd, int cmd, int arg)
{
      int retval;

#ifdef DEBUG_FCNTL
      printk("[%s:%d] irix_fcntl(%d, %d, %d) ", current->comm,
             current->pid, fd, cmd, arg);
#endif
      if (cmd == IRIX_F_ALLOCSP){
            return 0;
      }
      retval = sys_fcntl(fd, cmd, arg);
#ifdef DEBUG_FCNTL
      printk("%d\n", retval);
#endif
      return retval;
}

asmlinkage int irix_ulimit(int cmd, int arg)
{
      int retval;

      switch(cmd) {
      case 1:
            printk("[%s:%d] irix_ulimit: Wants to get file size limit.\n",
                   current->comm, current->pid);
            retval = -EINVAL;
            goto out;

      case 2:
            printk("[%s:%d] irix_ulimit: Wants to set file size limit.\n",
                   current->comm, current->pid);
            retval = -EINVAL;
            goto out;

      case 3:
            printk("[%s:%d] irix_ulimit: Wants to get brk limit.\n",
                   current->comm, current->pid);
            retval = -EINVAL;
            goto out;

      case 4:
#if 0
            printk("[%s:%d] irix_ulimit: Wants to get fd limit.\n",
                   current->comm, current->pid);
            retval = -EINVAL;
            goto out;
#endif
            retval = current->signal->rlim[RLIMIT_NOFILE].rlim_cur;
            goto out;

      case 5:
            printk("[%s:%d] irix_ulimit: Wants to get txt offset.\n",
                   current->comm, current->pid);
            retval = -EINVAL;
            goto out;

      default:
            printk("[%s:%d] irix_ulimit: Unknown command [%d].\n",
                   current->comm, current->pid, cmd);
            retval = -EINVAL;
            goto out;
      }
out:
      return retval;
}

asmlinkage int irix_unimp(struct pt_regs *regs)
{
      printk("irix_unimp [%s:%d] v0=%d v1=%d a0=%08lx a1=%08lx a2=%08lx "
             "a3=%08lx\n", current->comm, current->pid,
             (int) regs->regs[2], (int) regs->regs[3],
             regs->regs[4], regs->regs[5], regs->regs[6], regs->regs[7]);

      return -ENOSYS;
}

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