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sys_m68k.c

/*
 * linux/arch/m68knommu/kernel/sys_m68k.c
 *
 * This file contains various random system calls that
 * have a non-standard calling sequence on the Linux/m68k
 * platform.
 */

#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/syscalls.h>
#include <linux/mman.h>
#include <linux/file.h>
#include <linux/utsname.h>
#include <linux/ipc.h>
#include <linux/fs.h>

#include <asm/setup.h>
#include <asm/uaccess.h>
#include <asm/cachectl.h>
#include <asm/traps.h>
#include <asm/cacheflush.h>
#include <asm/unistd.h>

/* common code for old and new mmaps */
static inline long do_mmap2(
      unsigned long addr, unsigned long len,
      unsigned long prot, unsigned long flags,
      unsigned long fd, unsigned long pgoff)
{
      int error = -EBADF;
      struct file * file = NULL;

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

      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;
}

asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
      unsigned long prot, unsigned long flags,
      unsigned long fd, unsigned long pgoff)
{
      return do_mmap2(addr, len, prot, flags, fd, pgoff);
}

/*
 * Perform the select(nd, in, out, ex, tv) and mmap() system
 * calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
 * handle more than 4 system call parameters, so these system calls
 * used a memory block for parameter passing..
 */

struct mmap_arg_struct {
      unsigned long addr;
      unsigned long len;
      unsigned long prot;
      unsigned long flags;
      unsigned long fd;
      unsigned long offset;
};

asmlinkage int old_mmap(struct mmap_arg_struct *arg)
{
      struct mmap_arg_struct a;
      int error = -EFAULT;

      if (copy_from_user(&a, arg, sizeof(a)))
            goto out;

      error = -EINVAL;
      if (a.offset & ~PAGE_MASK)
            goto out;

      a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);

      error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
out:
      return error;
}

struct sel_arg_struct {
      unsigned long n;
      fd_set *inp, *outp, *exp;
      struct timeval *tvp;
};

asmlinkage int old_select(struct sel_arg_struct *arg)
{
      struct sel_arg_struct a;

      if (copy_from_user(&a, arg, sizeof(a)))
            return -EFAULT;
      /* sys_select() does the appropriate kernel locking */
      return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
}

/*
 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 *
 * This is really horribly ugly.
 */
asmlinkage int sys_ipc (uint call, int first, int second,
                  int third, void *ptr, long fifth)
{
      int version, ret;

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

      if (call <= SEMCTL)
            switch (call) {
            case SEMOP:
                  return sys_semop (first, (struct sembuf *)ptr, second);
            case SEMGET:
                  return sys_semget (first, second, third);
            case SEMCTL: {
                  union semun fourth;
                  if (!ptr)
                        return -EINVAL;
                  if (get_user(fourth.__pad, (void **) ptr))
                        return -EFAULT;
                  return sys_semctl (first, second, third, fourth);
                  }
            default:
                  return -EINVAL;
            }
      if (call <= MSGCTL) 
            switch (call) {
            case MSGSND:
                  return sys_msgsnd (first, (struct msgbuf *) ptr, 
                                second, third);
            case MSGRCV:
                  switch (version) {
                  case 0: {
                        struct ipc_kludge tmp;
                        if (!ptr)
                              return -EINVAL;
                        if (copy_from_user (&tmp,
                                        (struct ipc_kludge *)ptr,
                                        sizeof (tmp)))
                              return -EFAULT;
                        return sys_msgrcv (first, tmp.msgp, second,
                                       tmp.msgtyp, third);
                        }
                  default:
                        return sys_msgrcv (first,
                                       (struct msgbuf *) ptr,
                                       second, fifth, third);
                  }
            case MSGGET:
                  return sys_msgget ((key_t) first, second);
            case MSGCTL:
                  return sys_msgctl (first, second,
                                 (struct msqid_ds *) ptr);
            default:
                  return -EINVAL;
            }
      if (call <= SHMCTL)
            switch (call) {
            case SHMAT:
                  switch (version) {
                  default: {
                        ulong raddr;
                        ret = do_shmat (first, ptr, second, &raddr);
                        if (ret)
                              return ret;
                        return put_user (raddr, (ulong __user *) third);
                  }
                  }
            case SHMDT:
                  return sys_shmdt (ptr);
            case SHMGET:
                  return sys_shmget (first, second, third);
            case SHMCTL:
                  return sys_shmctl (first, second, ptr);
            default:
                  return -ENOSYS;
            }

      return -EINVAL;
}

/* sys_cacheflush -- flush (part of) the processor cache.  */
asmlinkage int
sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
{
      flush_cache_all();
      return(0);
}

asmlinkage int sys_getpagesize(void)
{
      return PAGE_SIZE;
}

/*
 * Do a system call from kernel instead of calling sys_execve so we
 * end up with proper pt_regs.
 */
int kernel_execve(const char *filename, char *const argv[], char *const envp[])
{
      register long __res asm ("%d0") = __NR_execve;
      register long __a asm ("%d1") = (long)(filename);
      register long __b asm ("%d2") = (long)(argv);
      register long __c asm ("%d3") = (long)(envp);
      asm volatile ("trap  #0" : "+d" (__res)
                  : "d" (__a), "d" (__b), "d" (__c));
      return __res;
}

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