/*
 * linux/arch/h8300/kernel/sys_h8300.c
 *
 * This file contains various random system calls that
 * have a non-standard calling sequence on the H8/300
 * 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/fs.h>
#include <linux/ipc.h>

#include <asm/setup.h>
#include <asm/uaccess.h>
#include <asm/cachectl.h>
#include <asm/traps.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;
}

#if 0 /* DAVIDM - do we want this */
struct mmap_arg_struct64 {
        __u32 addr;
        __u32 len;
        __u32 prot;
        __u32 flags;
        __u64 offset; /* 64 bits */
        __u32 fd;
};

asmlinkage long sys_mmap64(struct mmap_arg_struct64 *arg)
{
        int error = -EFAULT;
        struct file * file = NULL;
        struct mmap_arg_struct64 a;
        unsigned long pgoff;

        if (copy_from_user(&a, arg, sizeof(a)))
                return -EFAULT;

        if ((long)a.offset & ~PAGE_MASK)
                return -EINVAL;

        pgoff = a.offset >> PAGE_SHIFT;
        if ((a.offset >> PAGE_SHIFT) != pgoff)
                return -EINVAL;

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

        down_write(&current->mm->mmap_sem);
        error = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, pgoff);
        up_write(&current->mm->mmap_sem);
        if (file)
                fput(file);
out:
        return error;
}
#endif

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, (char *) ptr,
                                                 second, &raddr);
                                if (ret)
                                        return ret;
                                return put_user (raddr, (ulong *) third);
                        }
                        }
                case SHMDT: 
                        return sys_shmdt ((char *)ptr);
                case SHMGET:
                        return sys_shmget (first, second, third);
                case SHMCTL:
                        return sys_shmctl (first, second,
                                           (struct shmid_ds *) ptr);
                default:
                        return -EINVAL;
                }

        return -EINVAL;
}

/* sys_cacheflush -- no support.  */
asmlinkage int
sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
{
        return -EINVAL;
}

asmlinkage int sys_getpagesize(void)
{
        return PAGE_SIZE;
}

#if defined(CONFIG_SYSCALL_PRINT)
asmlinkage void syscall_print(void *dummy,...)
{
        struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4);
        printk("call %06lx:%ld 1:%08lx,2:%08lx,3:%08lx,ret:%08lx\n",
               ((regs->pc)&0xffffff)-2,regs->orig_er0,regs->er1,regs->er2,regs->er3,regs->er0);
}
#endif

/*
 * 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__("er0");
        register char *const *_c __asm__("er3") = envp;
        register char *const *_b __asm__("er2") = argv;
        register const char * _a __asm__("er1") = filename;
        __asm__ __volatile__ ("mov.l %1,er0\n\t"
                        "trapa  #0\n\t"
                        : "=r" (res)
                        : "g" (__NR_execve),
                          "g" (_a),
                          "g" (_b),
                          "g" (_c)
                        : "cc", "memory");
        return res;
}