/*
   * arch/v850/kernel/syscalls.c -- Various system-call definitions not
   * 	defined in machine-independent code
   *
   *  Copyright (C) 2001,02  NEC Corporation
   *  Copyright (C) 2001,02  Miles Bader <miles@gnu.org>
   *
   * This file is subject to the terms and conditions of the GNU General
   * Public License.  See the file COPYING in the main directory of this
   * archive for more details.
   *
   * This file was derived the ppc version, arch/ppc/kernel/syscalls.c
   * ... which was derived from "arch/i386/kernel/sys_i386.c" by Gary Thomas;
   *     modified by Cort Dougan (cort@cs.nmt.edu)
   *     and Paul Mackerras (paulus@cs.anu.edu.au).
   */

  #include <linux/errno.h>
  #include <linux/mm.h>
  #include <linux/smp.h>
  #include <linux/smp_lock.h>
  #include <linux/syscalls.h>
  #include <linux/sem.h>
  #include <linux/msg.h>
  #include <linux/shm.h>
  #include <linux/stat.h>
  #include <linux/mman.h>
  #include <linux/sys.h>
  #include <linux/ipc.h>
  #include <linux/utsname.h>
  #include <linux/file.h>
  
  #include <asm/uaccess.h>
  #include <asm/ipc.h>
  #include <asm/semaphore.h>

  #include <asm/unistd.h>

  
  /*
   * sys_ipc() is the de-multiplexer for the SysV IPC calls..
   *
   * This is really horribly ugly.
   */
  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;
  
  	ret = -EINVAL;
  	switch (call) {
  	case SEMOP:
  		ret = sys_semop (first, (struct sembuf *)ptr, second);
  		break;
  	case SEMGET:
  		ret = sys_semget (first, second, third);
  		break;
  	case SEMCTL:
  	{
  		union semun fourth;
  
  		if (!ptr)
  			break;
  		if ((ret = access_ok(VERIFY_READ, ptr, sizeof(long)) ? 0 : -EFAULT)
  		    || (ret = get_user(fourth.__pad, (void **)ptr)))
  			break;
  		ret = sys_semctl (first, second, third, fourth);
  		break;
  	}
  	case MSGSND:
  		ret = sys_msgsnd (first, (struct msgbuf *) ptr, second, third);
  		break;
  	case MSGRCV:
  		switch (version) {
  		case 0: {
  			struct ipc_kludge tmp;
  
  			if (!ptr)
  				break;
  			if ((ret = access_ok(VERIFY_READ, ptr, sizeof(tmp)) ? 0 : -EFAULT)
  			    || (ret = copy_from_user(&tmp,
  						(struct ipc_kludge *) ptr,
  						sizeof (tmp))))
  				break;
  			ret = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp,
  					  third);
  			break;
  			}
  		default:
  			ret = sys_msgrcv (first, (struct msgbuf *) ptr,
  					  second, fifth, third);
  			break;
  		}
  		break;
  	case MSGGET:
  		ret = sys_msgget ((key_t) first, second);
  		break;
  	case MSGCTL:
  		ret = sys_msgctl (first, second, (struct msqid_ds *) ptr);
  		break;
  	case SHMAT:
  		switch (version) {
  		default: {
  			ulong raddr;
  
  			if ((ret = access_ok(VERIFY_WRITE, (ulong*) third,
  					       sizeof(ulong)) ? 0 : -EFAULT))
  				break;
  			ret = do_shmat (first, (char *) ptr, second, &raddr);
  			if (ret)
  				break;
  			ret = put_user (raddr, (ulong *) third);
  			break;
  			}
  		case 1:	/* iBCS2 emulator entry point */
  			if (!segment_eq(get_fs(), get_ds()))
  				break;
  			ret = do_shmat (first, (char *) ptr, second,
  					 (ulong *) third);
  			break;
  		}
  		break;
  	case SHMDT: 
  		ret = sys_shmdt ((char *)ptr);
  		break;
  	case SHMGET:
  		ret = sys_shmget (first, second, third);
  		break;
  	case SHMCTL:
  		ret = sys_shmctl (first, second, (struct shmid_ds *) ptr);
  		break;
  	}
  
  	return ret;
  }
  
  /*
   * sys_pipe() is the normal C calling standard for creating
   * a pipe. It's not the way unix traditionally does this, though.
   */
  int sys_pipe (int *fildes)
  {
  	int fd[2];
  	int error;
  
  	error = do_pipe (fd);
  	if (!error) {
  		if (copy_to_user (fildes, fd, 2*sizeof (int)))
  			error = -EFAULT;
  	}
  	return error;
  }
  
  static inline unsigned long
  do_mmap2 (unsigned long addr, size_t len,
  	 unsigned long prot, unsigned long flags,
  	 unsigned long fd, unsigned long pgoff)
  {
  	struct file * file = NULL;
  	int ret = -EBADF;
  
  	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  	if (! (flags & MAP_ANONYMOUS)) {
  		if (!(file = fget (fd)))
  			goto out;
  	}
  	
  	down_write (&current->mm->mmap_sem);
  	ret = do_mmap_pgoff (file, addr, len, prot, flags, pgoff);
  	up_write (&current->mm->mmap_sem);
  	if (file)
  		fput (file);
  out:
  	return ret;
  }
  
  unsigned long sys_mmap2 (unsigned long addr, size_t len,
  			unsigned long prot, unsigned long flags,
  			unsigned long fd, unsigned long pgoff)
  {
  	return do_mmap2 (addr, len, prot, flags, fd, pgoff);
  }
  
  unsigned long sys_mmap (unsigned long addr, size_t len,
  		       unsigned long prot, unsigned long flags,
  		       unsigned long fd, off_t offset)
  {
  	int err = -EINVAL;
  
  	if (offset & ~PAGE_MASK)
  		goto out;
  
  	err = do_mmap2 (addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
  out:
  	return err;
  }

  
  /*
   * 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 char *__a __asm__ ("r6") = filename;
  	register void *__b __asm__ ("r7") = argv;
  	register void *__c __asm__ ("r8") = envp;
  	register unsigned long __syscall __asm__ ("r12") = __NR_execve;
  	register unsigned long __ret __asm__ ("r10");
  	__asm__ __volatile__ ("trap 0"
  			: "=r" (__ret), "=r" (__syscall)
  			: "1" (__syscall), "r" (__a), "r" (__b), "r" (__c)
  			: "r1", "r5", "r11", "r13", "r14",
  			  "r15", "r16", "r17", "r18", "r19");
  	return __ret;
  }