/*
 * linux/arch/sh/kernel/sys_sh.c
 *
 * This file contains various random system calls that
 * have a non-standard calling sequence on the Linux/SuperH
 * platform.
 *
 * Taken from i386 version.
 */
#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/module.h>
#include <linux/fs.h>
#include <linux/ipc.h>
#include <asm/syscalls.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
#include <asm/cacheflush.h>
#include <asm/cachectl.h>

static inline long
do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
         unsigned long flags, int 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 int old_mmap(unsigned long addr, unsigned long len,
        unsigned long prot, unsigned long flags,
        int fd, unsigned long off)
{
        if (off & ~PAGE_MASK)
                return -EINVAL;
        return do_mmap2(addr, len, prot, flags, fd, off>>PAGE_SHIFT);
}

asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
        unsigned long prot, unsigned long flags,
        unsigned long fd, unsigned long pgoff)
{
        /*
         * The shift for mmap2 is constant, regardless of PAGE_SIZE
         * setting.
         */
        if (pgoff & ((1 << (PAGE_SHIFT - 12)) - 1))
                return -EINVAL;

        pgoff >>= PAGE_SHIFT - 12;

        return do_mmap2(addr, len, prot, flags, fd, pgoff);
}

/*
 * 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 __user *ptr, long fifth)
{
        int version, ret;

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

        if (call <= SEMTIMEDOP)
                switch (call) {
                case SEMOP:
                        return sys_semtimedop(first,
                                              (struct sembuf __user *)ptr,
                                              second, NULL);
                case SEMTIMEDOP:
                        return sys_semtimedop(first,
                                (struct sembuf __user *)ptr, second,
                                (const struct timespec __user *)fifth);
                case SEMGET:
                        return sys_semget (first, second, third);
                case SEMCTL: {
                        union semun fourth;
                        if (!ptr)
                                return -EINVAL;
                        if (get_user(fourth.__pad, (void __user * __user *) 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 __user *) 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 __user *) ptr,
                                                   sizeof (tmp)))
                                        return -EFAULT;

                                return sys_msgrcv (first, tmp.msgp, second,
                                                   tmp.msgtyp, third);
                        }
                        default:
                                return sys_msgrcv (first,
                                                   (struct msgbuf __user *) ptr,
                                                   second, fifth, third);
                        }
                case MSGGET:
                        return sys_msgget ((key_t) first, second);
                case MSGCTL:
                        return sys_msgctl (first, second,
                                           (struct msqid_ds __user *) ptr);
                default:
                        return -EINVAL;
                }
        if (call <= SHMCTL)
                switch (call) {
                case SHMAT:
                        switch (version) {
                        default: {
                                ulong raddr;
                                ret = do_shmat (first, (char __user *) ptr,
                                                 second, &raddr);
                                if (ret)
                                        return ret;
                                return put_user (raddr, (ulong __user *) third);
                        }
                        case 1: /* iBCS2 emulator entry point */
                                if (!segment_eq(get_fs(), get_ds()))
                                        return -EINVAL;
                                return do_shmat (first, (char __user *) ptr,
                                                  second, (ulong *) third);
                        }
                case SHMDT:
                        return sys_shmdt ((char __user *)ptr);
                case SHMGET:
                        return sys_shmget (first, second, third);
                case SHMCTL:
                        return sys_shmctl (first, second,
                                           (struct shmid_ds __user *) ptr);
                default:
                        return -EINVAL;
                }

        return -EINVAL;
}

/* sys_cacheflush -- flush (part of) the processor cache.  */
asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len, int op)
{
        struct vm_area_struct *vma;

        if ((op <= 0) || (op > (CACHEFLUSH_D_PURGE|CACHEFLUSH_I)))
                return -EINVAL;

        /*
         * Verify that the specified address region actually belongs
         * to this process.
         */
        if (addr + len < addr)
                return -EFAULT;

        down_read(&current->mm->mmap_sem);
        vma = find_vma (current->mm, addr);
        if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end) {
                up_read(&current->mm->mmap_sem);
                return -EFAULT;
        }

        switch (op & CACHEFLUSH_D_PURGE) {
                case CACHEFLUSH_D_INVAL:
                        __flush_invalidate_region((void *)addr, len);
                        break;
                case CACHEFLUSH_D_WB:
                        __flush_wback_region((void *)addr, len);
                        break;
                case CACHEFLUSH_D_PURGE:
                        __flush_purge_region((void *)addr, len);
                        break;
        }

        if (op & CACHEFLUSH_I)
                flush_cache_all();

        up_read(&current->mm->mmap_sem);
        return 0;
}

asmlinkage int sys_uname(struct old_utsname __user *name)
{
        int err;
        if (!name)
                return -EFAULT;
        down_read(&uts_sem);
        err = copy_to_user(name, utsname(), sizeof(*name));
        up_read(&uts_sem);
        return err?-EFAULT:0;
}