/*
 * sys_parisc32.c: Conversion between 32bit and 64bit native syscalls.
 *
 * Copyright (C) 2000-2001 Hewlett Packard Company
 * Copyright (C) 2000 John Marvin
 * Copyright (C) 2001 Matthew Wilcox
 *
 * These routines maintain argument size conversion between 32bit and 64bit
 * environment. Based heavily on sys_ia32.c and sys_sparc32.c.
 */

#include <linux/config.h>
#include <linux/compat.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/fs.h> 
#include <linux/mm.h> 
#include <linux/file.h> 
#include <linux/signal.h>
#include <linux/resource.h>
#include <linux/times.h>
#include <linux/utsname.h>
#include <linux/time.h>
#include <linux/timex.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/slab.h>
#include <linux/uio.h>
#include <linux/nfs_fs.h>
#include <linux/ncp_fs.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/cache.h>
#include <linux/nfsd/xdr.h>
#include <linux/nfsd/syscall.h>
#include <linux/poll.h>
#include <linux/personality.h>
#include <linux/stat.h>
#include <linux/highmem.h>
#include <linux/highuid.h>
#include <linux/mman.h>
#include <linux/binfmts.h>
#include <linux/namei.h>
#include <linux/vfs.h>
#include <linux/ptrace.h>
#include <linux/swap.h>
#include <linux/syscalls.h>

#include <asm/types.h>
#include <asm/uaccess.h>
#include <asm/semaphore.h>
#include <asm/mmu_context.h>

#include "sys32.h"

#undef DEBUG

#ifdef DEBUG
#define DBG(x)  printk x
#else
#define DBG(x)
#endif

/*
 * sys32_execve() executes a new program.
 */

asmlinkage int sys32_execve(struct pt_regs *regs)
{
        int error;
        char *filename;

        DBG(("sys32_execve(%p) r26 = 0x%lx\n", regs, regs->gr[26]));
        filename = getname((char *) regs->gr[26]);
        error = PTR_ERR(filename);
        if (IS_ERR(filename))
                goto out;
        error = compat_do_execve(filename, compat_ptr(regs->gr[25]),
                                 compat_ptr(regs->gr[24]), regs);
        if (error == 0)
                current->ptrace &= ~PT_DTRACE;
        putname(filename);
out:

        return error;
}

asmlinkage long sys32_unimplemented(int r26, int r25, int r24, int r23,
        int r22, int r21, int r20)
{
    printk(KERN_ERR "%s(%d): Unimplemented 32 on 64 syscall #%d!\n", 
        current->comm, current->pid, r20);
    return -ENOSYS;
}

#ifdef CONFIG_SYSCTL

struct __sysctl_args32 {
        u32 name;
        int nlen;
        u32 oldval;
        u32 oldlenp;
        u32 newval;
        u32 newlen;
        u32 __unused[4];
};

asmlinkage long sys32_sysctl(struct __sysctl_args32 *args)
{
        struct __sysctl_args32 tmp;
        int error;
        unsigned int oldlen32;
        size_t oldlen, *oldlenp = NULL;
        unsigned long addr = (((long)&args->__unused[0]) + 7) & ~7;
        extern int do_sysctl(int *name, int nlen, void *oldval, size_t *oldlenp,
               void *newval, size_t newlen);

        DBG(("sysctl32(%p)\n", args));

        if (copy_from_user(&tmp, args, sizeof(tmp)))
                return -EFAULT;

        if (tmp.oldval && tmp.oldlenp) {
                /* Duh, this is ugly and might not work if sysctl_args
                   is in read-only memory, but do_sysctl does indirectly
                   a lot of uaccess in both directions and we'd have to
                   basically copy the whole sysctl.c here, and
                   glibc's __sysctl uses rw memory for the structure
                   anyway.  */
                /* a possibly better hack than this, which will avoid the
                 * problem if the struct is read only, is to push the
                 * 'oldlen' value out to the user's stack instead. -PB
                 */
                if (get_user(oldlen32, (u32 *)(u64)tmp.oldlenp))
                        return -EFAULT;
                oldlen = oldlen32;
                if (put_user(oldlen, (size_t *)addr))
                        return -EFAULT;
                oldlenp = (size_t *)addr;
        }

        lock_kernel();
        error = do_sysctl((int *)(u64)tmp.name, tmp.nlen, (void *)(u64)tmp.oldval,
                          oldlenp, (void *)(u64)tmp.newval, tmp.newlen);
        unlock_kernel();
        if (oldlenp) {
                if (!error) {
                        if (get_user(oldlen, (size_t *)addr)) {
                                error = -EFAULT;
                        } else {
                                oldlen32 = oldlen;
                                if (put_user(oldlen32, (u32 *)(u64)tmp.oldlenp))
                                        error = -EFAULT;
                        }
                }
                if (copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused)))
                        error = -EFAULT;
        }
        return error;
}

#else /* CONFIG_SYSCTL */

asmlinkage long sys32_sysctl(struct __sysctl_args *args)
{
        return -ENOSYS;
}
#endif /* CONFIG_SYSCTL */

asmlinkage long sys32_sched_rr_get_interval(pid_t pid,
        struct compat_timespec *interval)
{
        struct timespec t;
        int ret;
        
        KERNEL_SYSCALL(ret, sys_sched_rr_get_interval, pid, &t);
        if (put_compat_timespec(&t, interval))
                return -EFAULT;
        return ret;
}

static int
put_compat_timeval(struct compat_timeval *u, struct timeval *t)
{
        struct compat_timeval t32;
        t32.tv_sec = t->tv_sec;
        t32.tv_usec = t->tv_usec;
        return copy_to_user(u, &t32, sizeof t32);
}

static inline long get_ts32(struct timespec *o, struct compat_timeval *i)
{
        long usec;

        if (__get_user(o->tv_sec, &i->tv_sec))
                return -EFAULT;
        if (__get_user(usec, &i->tv_usec))
                return -EFAULT;
        o->tv_nsec = usec * 1000;
        return 0;
}

asmlinkage long sys32_time(compat_time_t *tloc)
{
        struct timeval tv;
        compat_time_t now32;

        do_gettimeofday(&tv);
        now32 = tv.tv_sec;

        if (tloc)
                if (put_user(now32, tloc))
                        now32 = -EFAULT;

        return now32;
}

asmlinkage int
sys32_gettimeofday(struct compat_timeval *tv, struct timezone *tz)
{
    extern void do_gettimeofday(struct timeval *tv);

    if (tv) {
            struct timeval ktv;
            do_gettimeofday(&ktv);
            if (put_compat_timeval(tv, &ktv))
                    return -EFAULT;
    }
    if (tz) {
            extern struct timezone sys_tz;
            if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
                    return -EFAULT;
    }
    return 0;
}

asmlinkage 
int sys32_settimeofday(struct compat_timeval *tv, struct timezone *tz)
{
        struct timespec kts;
        struct timezone ktz;

        if (tv) {
                if (get_ts32(&kts, tv))
                        return -EFAULT;
        }
        if (tz) {
                if (copy_from_user(&ktz, tz, sizeof(ktz)))
                        return -EFAULT;
        }

        return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
}

int cp_compat_stat(struct kstat *stat, struct compat_stat *statbuf)
{
        int err;

        if (stat->size > MAX_NON_LFS || !new_valid_dev(stat->dev) ||
            !new_valid_dev(stat->rdev))
                return -EOVERFLOW;

        err  = put_user(new_encode_dev(stat->dev), &statbuf->st_dev);
        err |= put_user(stat->ino, &statbuf->st_ino);
        err |= put_user(stat->mode, &statbuf->st_mode);
        err |= put_user(stat->nlink, &statbuf->st_nlink);
        err |= put_user(0, &statbuf->st_reserved1);
        err |= put_user(0, &statbuf->st_reserved2);
        err |= put_user(new_encode_dev(stat->rdev), &statbuf->st_rdev);
        err |= put_user(stat->size, &statbuf->st_size);
        err |= put_user(stat->atime.tv_sec, &statbuf->st_atime);
        err |= put_user(stat->atime.tv_nsec, &statbuf->st_atime_nsec);
        err |= put_user(stat->mtime.tv_sec, &statbuf->st_mtime);
        err |= put_user(stat->mtime.tv_nsec, &statbuf->st_mtime_nsec);
        err |= put_user(stat->ctime.tv_sec, &statbuf->st_ctime);
        err |= put_user(stat->ctime.tv_nsec, &statbuf->st_ctime_nsec);
        err |= put_user(stat->blksize, &statbuf->st_blksize);
        err |= put_user(stat->blocks, &statbuf->st_blocks);
        err |= put_user(0, &statbuf->__unused1);
        err |= put_user(0, &statbuf->__unused2);
        err |= put_user(0, &statbuf->__unused3);
        err |= put_user(0, &statbuf->__unused4);
        err |= put_user(0, &statbuf->__unused5);
        err |= put_user(0, &statbuf->st_fstype); /* not avail */
        err |= put_user(0, &statbuf->st_realdev); /* not avail */
        err |= put_user(0, &statbuf->st_basemode); /* not avail */
        err |= put_user(0, &statbuf->st_spareshort);
        err |= put_user(stat->uid, &statbuf->st_uid);
        err |= put_user(stat->gid, &statbuf->st_gid);
        err |= put_user(0, &statbuf->st_spare4[0]);
        err |= put_user(0, &statbuf->st_spare4[1]);
        err |= put_user(0, &statbuf->st_spare4[2]);

        return err;
}

struct linux32_dirent {
        u32             d_ino;
        compat_off_t    d_off;
        u16             d_reclen;
        char            d_name[1];
};

struct old_linux32_dirent {
        u32     d_ino;
        u32     d_offset;
        u16     d_namlen;
        char    d_name[1];
};

struct getdents32_callback {
        struct linux32_dirent * current_dir;
        struct linux32_dirent * previous;
        int count;
        int error;
};

struct readdir32_callback {
        struct old_linux32_dirent * dirent;
        int count;
};

#define ROUND_UP(x,a)   ((__typeof__(x))(((unsigned long)(x) + ((a) - 1)) & ~((a) - 1)))
#define NAME_OFFSET(de) ((int) ((de)->d_name - (char *) (de)))
static int
filldir32 (void *__buf, const char *name, int namlen, loff_t offset, ino_t ino,
           unsigned int d_type)
{
        struct linux32_dirent * dirent;
        struct getdents32_callback * buf = (struct getdents32_callback *) __buf;
        int reclen = ROUND_UP(NAME_OFFSET(dirent) + namlen + 1, 4);

        buf->error = -EINVAL;   /* only used if we fail.. */
        if (reclen > buf->count)
                return -EINVAL;
        dirent = buf->previous;
        if (dirent)
                put_user(offset, &dirent->d_off);
        dirent = buf->current_dir;
        buf->previous = dirent;
        put_user(ino, &dirent->d_ino);
        put_user(reclen, &dirent->d_reclen);
        copy_to_user(dirent->d_name, name, namlen);
        put_user(0, dirent->d_name + namlen);
        dirent = (struct linux32_dirent *)((char *)dirent + reclen);
        buf->current_dir = dirent;
        buf->count -= reclen;
        return 0;
}

asmlinkage long
sys32_getdents (unsigned int fd, void * dirent, unsigned int count)
{
        struct file * file;
        struct linux32_dirent * lastdirent;
        struct getdents32_callback buf;
        int error;

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

        buf.current_dir = (struct linux32_dirent *) dirent;
        buf.previous = NULL;
        buf.count = count;
        buf.error = 0;

        error = vfs_readdir(file, 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;
        }

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

static int
fillonedir32 (void * __buf, const char * name, int namlen, loff_t offset, ino_t ino,
              unsigned int d_type)
{
        struct readdir32_callback * buf = (struct readdir32_callback *) __buf;
        struct old_linux32_dirent * dirent;

        if (buf->count)
                return -EINVAL;
        buf->count++;
        dirent = buf->dirent;
        put_user(ino, &dirent->d_ino);
        put_user(offset, &dirent->d_offset);
        put_user(namlen, &dirent->d_namlen);
        copy_to_user(dirent->d_name, name, namlen);
        put_user(0, dirent->d_name + namlen);
        return 0;
}

asmlinkage long
sys32_readdir (unsigned int fd, void * dirent, unsigned int count)
{
        int error;
        struct file * file;
        struct readdir32_callback buf;

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

        buf.count = 0;
        buf.dirent = dirent;

        error = vfs_readdir(file, fillonedir32, &buf);
        if (error >= 0)
                error = buf.count;
        fput(file);
out:
        return error;
}

/*** copied from mips64 ***/
/*
 * Ooo, nasty.  We need here to frob 32-bit unsigned longs to
 * 64-bit unsigned longs.
 */

static inline int
get_fd_set32(unsigned long n, u32 *ufdset, unsigned long *fdset)
{
        n = (n + 8*sizeof(u32) - 1) / (8*sizeof(u32));
        if (ufdset) {
                unsigned long odd;

                if (verify_area(VERIFY_WRITE, ufdset, n*sizeof(u32)))
                        return -EFAULT;

                odd = n & 1UL;
                n &= ~1UL;
                while (n) {
                        unsigned long h, l;
                        __get_user(l, ufdset);
                        __get_user(h, ufdset+1);
                        ufdset += 2;
                        *fdset++ = h << 32 | l;
                        n -= 2;
                }
                if (odd)
                        __get_user(*fdset, ufdset);
        } else {
                /* Tricky, must clear full unsigned long in the
                 * kernel fdset at the end, this makes sure that
                 * actually happens.
                 */
                memset(fdset, 0, ((n + 1) & ~1)*sizeof(u32));
        }
        return 0;
}

static inline void
set_fd_set32(unsigned long n, u32 *ufdset, unsigned long *fdset)
{
        unsigned long odd;
        n = (n + 8*sizeof(u32) - 1) / (8*sizeof(u32));

        if (!ufdset)
                return;

        odd = n & 1UL;
        n &= ~1UL;
        while (n) {
                unsigned long h, l;
                l = *fdset++;
                h = l >> 32;
                __put_user(l, ufdset);
                __put_user(h, ufdset+1);
                ufdset += 2;
                n -= 2;
        }
        if (odd)
                __put_user(*fdset, ufdset);
}

struct msgbuf32 {
    int mtype;
    char mtext[1];
};

asmlinkage long sys32_msgsnd(int msqid,
                                struct msgbuf32 *umsgp32,
                                size_t msgsz, int msgflg)
{
        struct msgbuf *mb;
        struct msgbuf32 mb32;
        int err;

        if ((mb = kmalloc(msgsz + sizeof *mb + 4, GFP_KERNEL)) == NULL)
                return -ENOMEM;

        err = get_user(mb32.mtype, &umsgp32->mtype);
        mb->mtype = mb32.mtype;
        err |= copy_from_user(mb->mtext, &umsgp32->mtext, msgsz);

        if (err)
                err = -EFAULT;
        else
                KERNEL_SYSCALL(err, sys_msgsnd, msqid, mb, msgsz, msgflg);

        kfree(mb);
        return err;
}

asmlinkage long sys32_msgrcv(int msqid,
                                struct msgbuf32 *umsgp32,
                                size_t msgsz, long msgtyp, int msgflg)
{
        struct msgbuf *mb;
        struct msgbuf32 mb32;
        int err, len;

        if ((mb = kmalloc(msgsz + sizeof *mb + 4, GFP_KERNEL)) == NULL)
                return -ENOMEM;

        KERNEL_SYSCALL(err, sys_msgrcv, msqid, mb, msgsz, msgtyp, msgflg);

        if (err >= 0) {
                len = err;
                mb32.mtype = mb->mtype;
                err = put_user(mb32.mtype, &umsgp32->mtype);
                err |= copy_to_user(&umsgp32->mtext, mb->mtext, len);
                if (err)
                        err = -EFAULT;
                else
                        err = len;
        }

        kfree(mb);
        return err;
}

asmlinkage int sys32_sendfile(int out_fd, int in_fd, compat_off_t *offset, s32 count)
{
        mm_segment_t old_fs = get_fs();
        int ret;
        off_t of;

        if (offset && get_user(of, offset))
                return -EFAULT;

        set_fs(KERNEL_DS);
        ret = sys_sendfile(out_fd, in_fd, offset ? &of : NULL, count);
        set_fs(old_fs);

        if (offset && put_user(of, offset))
                return -EFAULT;

        return ret;
}

typedef long __kernel_loff_t32;         /* move this to asm/posix_types.h? */

asmlinkage int sys32_sendfile64(int out_fd, int in_fd, __kernel_loff_t32 *offset, s32 count)
{
        mm_segment_t old_fs = get_fs();
        int ret;
        loff_t lof;
        
        if (offset && get_user(lof, offset))
                return -EFAULT;
                
        set_fs(KERNEL_DS);
        ret = sys_sendfile64(out_fd, in_fd, offset ? &lof : NULL, count);
        set_fs(old_fs);
        
        if (offset && put_user(lof, offset))
                return -EFAULT;
                
        return ret;
}


struct timex32 {
        unsigned int modes;     /* mode selector */
        int offset;             /* time offset (usec) */
        int freq;               /* frequency offset (scaled ppm) */
        int maxerror;           /* maximum error (usec) */
        int esterror;           /* estimated error (usec) */
        int status;             /* clock command/status */
        int constant;           /* pll time constant */
        int precision;          /* clock precision (usec) (read only) */
        int tolerance;          /* clock frequency tolerance (ppm)
                                 * (read only)
                                 */
        struct compat_timeval time;     /* (read only) */
        int tick;               /* (modified) usecs between clock ticks */

        int ppsfreq;           /* pps frequency (scaled ppm) (ro) */
        int jitter;            /* pps jitter (us) (ro) */
        int shift;              /* interval duration (s) (shift) (ro) */
        int stabil;            /* pps stability (scaled ppm) (ro) */
        int jitcnt;            /* jitter limit exceeded (ro) */
        int calcnt;            /* calibration intervals (ro) */
        int errcnt;            /* calibration errors (ro) */
        int stbcnt;            /* stability limit exceeded (ro) */

        int  :32; int  :32; int  :32; int  :32;
        int  :32; int  :32; int  :32; int  :32;
        int  :32; int  :32; int  :32; int  :32;
};

asmlinkage long sys32_adjtimex(struct timex32 *txc_p32)
{
        struct timex txc;
        struct timex32 t32;
        int ret;
        extern int do_adjtimex(struct timex *txc);

        if(copy_from_user(&t32, txc_p32, sizeof(struct timex32)))
                return -EFAULT;
#undef CP
#define CP(x) txc.x = t32.x
        CP(modes); CP(offset); CP(freq); CP(maxerror); CP(esterror);
        CP(status); CP(constant); CP(precision); CP(tolerance);
        CP(time.tv_sec); CP(time.tv_usec); CP(tick); CP(ppsfreq); CP(jitter);
        CP(shift); CP(stabil); CP(jitcnt); CP(calcnt); CP(errcnt);
        CP(stbcnt);
        ret = do_adjtimex(&txc);
#undef CP
#define CP(x) t32.x = txc.x
        CP(modes); CP(offset); CP(freq); CP(maxerror); CP(esterror);
        CP(status); CP(constant); CP(precision); CP(tolerance);
        CP(time.tv_sec); CP(time.tv_usec); CP(tick); CP(ppsfreq); CP(jitter);
        CP(shift); CP(stabil); CP(jitcnt); CP(calcnt); CP(errcnt);
        CP(stbcnt);
        return copy_to_user(txc_p32, &t32, sizeof(struct timex32)) ? -EFAULT : ret;
}


struct sysinfo32 {
        s32 uptime;
        u32 loads[3];
        u32 totalram;
        u32 freeram;
        u32 sharedram;
        u32 bufferram;
        u32 totalswap;
        u32 freeswap;
        unsigned short procs;
        u32 totalhigh;
        u32 freehigh;
        u32 mem_unit;
        char _f[12];
};

/* We used to call sys_sysinfo and translate the result.  But sys_sysinfo
 * undoes the good work done elsewhere, and rather than undoing the
 * damage, I decided to just duplicate the code from sys_sysinfo here.
 */

asmlinkage int sys32_sysinfo(struct sysinfo32 *info)
{
        struct sysinfo val;
        int err;
        unsigned long seq;

        /* We don't need a memset here because we copy the
         * struct to userspace once element at a time.
         */

        do {
                seq = read_seqbegin(&xtime_lock);
                val.uptime = jiffies / HZ;

                val.loads[0] = avenrun[0] << (SI_LOAD_SHIFT - FSHIFT);
                val.loads[1] = avenrun[1] << (SI_LOAD_SHIFT - FSHIFT);
                val.loads[2] = avenrun[2] << (SI_LOAD_SHIFT - FSHIFT);

                val.procs = nr_threads;
        } while (read_seqretry(&xtime_lock, seq));


        si_meminfo(&val);
        si_swapinfo(&val);
        
        err = put_user (val.uptime, &info->uptime);
        err |= __put_user (val.loads[0], &info->loads[0]);
        err |= __put_user (val.loads[1], &info->loads[1]);
        err |= __put_user (val.loads[2], &info->loads[2]);
        err |= __put_user (val.totalram, &info->totalram);
        err |= __put_user (val.freeram, &info->freeram);
        err |= __put_user (val.sharedram, &info->sharedram);
        err |= __put_user (val.bufferram, &info->bufferram);
        err |= __put_user (val.totalswap, &info->totalswap);
        err |= __put_user (val.freeswap, &info->freeswap);
        err |= __put_user (val.procs, &info->procs);
        err |= __put_user (val.totalhigh, &info->totalhigh);
        err |= __put_user (val.freehigh, &info->freehigh);
        err |= __put_user (val.mem_unit, &info->mem_unit);
        return err ? -EFAULT : 0;
}


/* lseek() needs a wrapper because 'offset' can be negative, but the top
 * half of the argument has been zeroed by syscall.S.
 */

asmlinkage int sys32_lseek(unsigned int fd, int offset, unsigned int origin)
{
        return sys_lseek(fd, offset, origin);
}

asmlinkage long sys32_semctl(int semid, int semnum, int cmd, union semun arg)
{
        union semun u;
        
        if (cmd == SETVAL) {
                /* Ugh.  arg is a union of int,ptr,ptr,ptr, so is 8 bytes.
                 * The int should be in the first 4, but our argument
                 * frobbing has left it in the last 4.
                 */
                u.val = *((int *)&arg + 1);
                return sys_semctl (semid, semnum, cmd, u);
        }
        return sys_semctl (semid, semnum, cmd, arg);
}

long sys32_lookup_dcookie(u32 cookie_high, u32 cookie_low, char *buf,
                          size_t len)
{
        return sys_lookup_dcookie((u64)cookie_high << 32 | cookie_low,
                                  buf, len);
}