/*      $NetBSD: linux32_unistd.c,v 1.44 2021/11/27 21:15:07 ryo Exp $ */

/*-
 * Copyright (c) 2006 Emmanuel Dreyfus, all rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Emmanuel Dreyfus
 * 4. The name of the author may not be used to endorse or promote 
 *    products derived from this software without specific prior written 
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE THE AUTHOR AND CONTRIBUTORS ``AS IS'' 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS 
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>

__KERNEL_RCSID(0, "$NetBSD: linux32_unistd.c,v 1.44 2021/11/27 21:15:07 ryo Exp $");

#include <sys/types.h>
#include <sys/param.h>
#include <sys/fstypes.h>
#include <sys/signal.h>
#include <sys/dirent.h>
#include <sys/kernel.h>
#include <sys/fcntl.h>
#include <sys/select.h>
#include <sys/proc.h>
#include <sys/ucred.h>
#include <sys/swap.h>
#include <sys/kauth.h>
#include <sys/filedesc.h>
#include <sys/vfs_syscalls.h>

#include <machine/types.h>

#include <sys/syscallargs.h>

#include <compat/netbsd32/netbsd32.h>
#include <compat/netbsd32/netbsd32_conv.h>

#include <compat/linux/common/linux_types.h>
#include <compat/linux/common/linux_signal.h>
#include <compat/linux/common/linux_machdep.h>
#include <compat/linux/common/linux_misc.h>
#include <compat/linux/common/linux_oldolduname.h>
#include <compat/linux/common/linux_ipc.h>
#include <compat/linux/common/linux_sem.h>
#include <compat/linux/common/linux_fcntl.h>
#include <compat/linux/linux_syscallargs.h>

#include <compat/linux32/common/linux32_types.h>
#include <compat/linux32/common/linux32_signal.h>
#include <compat/linux32/common/linux32_machdep.h>
#include <compat/linux32/common/linux32_sched.h>
#include <compat/linux32/common/linux32_sysctl.h>
#include <compat/linux32/common/linux32_socketcall.h>
#include <compat/linux32/linux32_syscall.h>
#include <compat/linux32/linux32_syscallargs.h>

static int linux32_select1(struct lwp *, register_t *, 
    int, fd_set *, fd_set *, fd_set *, struct timeval *);

int
linux32_sys_brk(struct lwp *l, const struct linux32_sys_brk_args *uap, register_t *retval)
{
        /* {
                syscallarg(netbsd32_charp) nsize;
        } */
        struct linux_sys_brk_args ua;

        NETBSD32TOP_UAP(nsize, char);
        return linux_sys_brk(l, &ua, retval);
}

int
linux32_sys_llseek(struct lwp *l, const struct linux32_sys_llseek_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) fd;
                syscallarg(u_int32_t) ohigh;
                syscallarg(u_int32_t) olow;
                syscallarg(netbsd32_voidp) res;
                syscallarg(int) whence;
        } */
        struct linux_sys_llseek_args ua;

        NETBSD32TO64_UAP(fd);
        NETBSD32TO64_UAP(ohigh);
        NETBSD32TO64_UAP(olow);
        NETBSD32TOP_UAP(res, void);
        NETBSD32TO64_UAP(whence);

        return linux_sys_llseek(l, &ua, retval);
}

int
linux32_sys_select(struct lwp *l, const struct linux32_sys_select_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) nfds;
                syscallarg(netbsd32_fd_setp_t) readfds;
                syscallarg(netbsd32_fd_setp_t) writefds;
                syscallarg(netbsd32_fd_setp_t) exceptfds;
                syscallarg(netbsd32_timeval50p_t) timeout;
        } */

        return linux32_select1(l, retval, SCARG(uap, nfds), 
            SCARG_P32(uap, readfds),
            SCARG_P32(uap, writefds), 
            SCARG_P32(uap, exceptfds), 
            SCARG_P32(uap, timeout));
}

int
linux32_sys_oldselect(struct lwp *l, const struct linux32_sys_oldselect_args *uap, register_t *retval)
{
        /* {
                syscallarg(linux32_oldselectp_t) lsp;
        } */
        struct linux32_oldselect lsp32;
        int error;

        if ((error = copyin(SCARG_P32(uap, lsp), &lsp32, sizeof(lsp32))) != 0)
                return error;

        return linux32_select1(l, retval, lsp32.nfds, 
             NETBSD32PTR64(lsp32.readfds), NETBSD32PTR64(lsp32.writefds),
             NETBSD32PTR64(lsp32.exceptfds), NETBSD32PTR64(lsp32.timeout));
}

static int
linux32_select1(struct lwp *l, register_t *retval, int nfds,
                fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
                struct timeval *timeout)
{   
        struct timespec ts0, ts1, uts, *ts = NULL;
        struct netbsd32_timeval50 utv32;
        int error;


        /*
         * Store current time for computation of the amount of
         * time left.
         */
        if (timeout) {
                if ((error = copyin(timeout, &utv32, sizeof(utv32))))
                        return error;

                uts.tv_sec = utv32.tv_sec;
                uts.tv_nsec = (long)((unsigned long)utv32.tv_usec * 1000);

                if (itimespecfix(&uts)) {
                        /*
                         * The timeval was invalid.  Convert it to something
                         * valid that will act as it does under Linux.
                         */
                        uts.tv_sec += uts.tv_nsec / 1000000000;
                        uts.tv_nsec %= 1000000000;
                        if (uts.tv_nsec < 0) {
                                uts.tv_sec -= 1;
                                uts.tv_nsec += 1000000000;
                        }
                        if (uts.tv_sec < 0)
                                timespecclear(&uts);
                }
                nanotime(&ts0);
                ts = &uts;
        } else
                timespecclear(&uts); /* XXX GCC4 */

        error = selcommon(retval, nfds, readfds, writefds, exceptfds, ts, NULL);

        if (error) {
                /*
                 * See fs/select.c in the Linux kernel.  Without this,
                 * Maelstrom doesn't work.
                 */
                if (error == ERESTART)
                        error = EINTR;
                return error;
        }

        if (timeout) {
                if (*retval) {
                        /*
                         * Compute how much time was left of the timeout,
                         * by subtracting the current time and the time
                         * before we started the call, and subtracting
                         * that result from the user-supplied value.
                         */
                        nanotime(&ts1);
                        timespecsub(&ts1, &ts0, &ts1);
                        timespecsub(&uts, &ts1, &uts);
                        if (uts.tv_sec < 0)
                                timespecclear(&uts);
                } else {
                        timespecclear(&uts);
                }
                
                utv32.tv_sec = uts.tv_sec;
                utv32.tv_usec = uts.tv_nsec / 1000;

                if ((error = copyout(&utv32, timeout, sizeof(utv32))))
                        return error;
        }

        return 0;
}

int
linux32_sys_pselect6(struct lwp *l, const struct linux32_sys_pselect6_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(int) nfds;
                syscallarg(netbsd32_fd_setp_t) readfds;
                syscallarg(netbsd32_fd_setp_t) writefds;
                syscallarg(netbsd32_fd_setp_t) exceptfds;
                syscallarg(linux32_timespecp_t) timeout;
                syscallarg(linux32_sized_sigsetp_t) ss;
        } */
        struct timespec uts, ts0, ts1, *tsp;
        linux32_sized_sigset_t lsss;
        struct linux32_timespec lts;
        linux32_sigset_t lss;
        sigset_t *ssp;
        sigset_t ss;
        int error;
        void *p;

        ssp = NULL;
        if ((p = SCARG_P32(uap, ss)) != NULL) {
                if ((error = copyin(p, &lsss, sizeof(lsss))) != 0)
                        return (error);
                if (lsss.ss_len != sizeof(lss))
                        return (EINVAL);
                if ((p = NETBSD32PTR64(lsss.ss)) != NULL) {
                        if ((error = copyin(p, &lss, sizeof(lss))) != 0)
                                return (error);
                        linux32_to_native_sigset(&ss, &lss);
                        ssp = &ss;
                }
        }

        if ((p = SCARG_P32(uap, timeout)) != NULL) {
                error = copyin(p, &lts, sizeof(lts));
                if (error != 0)
                        return (error);
                linux32_to_native_timespec(&uts, &lts);

                if (itimespecfix(&uts))
                        return (EINVAL);

                nanotime(&ts0);
                tsp = &uts;
        } else {
                tsp = NULL;
        }

        error = selcommon(retval, SCARG(uap, nfds), SCARG_P32(uap, readfds),
            SCARG_P32(uap, writefds), SCARG_P32(uap, exceptfds), tsp, ssp);

        if (error == 0 && tsp != NULL) {
                if (retval != 0) {
                        /*
                         * Compute how much time was left of the timeout,
                         * by subtracting the current time and the time
                         * before we started the call, and subtracting
                         * that result from the user-supplied value.
                         */
                        nanotime(&ts1);
                        timespecsub(&ts1, &ts0, &ts1);
                        timespecsub(&uts, &ts1, &uts);
                        if (uts.tv_sec < 0)
                                timespecclear(&uts);
                } else {
                        timespecclear(&uts);
                }

                native_to_linux32_timespec(&lts, &uts);
                error = copyout(&lts, SCARG_P32(uap, timeout), sizeof(lts));
        }

        return (error);
}

int
linux32_sys_pipe(struct lwp *l, const struct linux32_sys_pipe_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(netbsd32_intp) fd;
        } */
        int f[2], error;

        if ((error = pipe1(l, f, 0)))
                return error;

        if ((error = copyout(f, SCARG_P32(uap, fd), sizeof(f))) != 0)
                return error;
        retval[0] = 0;
        return 0;
}

int
linux32_sys_pipe2(struct lwp *l, const struct linux32_sys_pipe2_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(netbsd32_intp) fd;
        } */
        int f[2], flags, error;

        flags = linux_to_bsd_ioflags(SCARG(uap, flags));
        if ((flags & ~(O_CLOEXEC|O_NONBLOCK)) != 0)
                return EINVAL;

        if ((error = pipe1(l, f, flags)))
                return error;

        if ((error = copyout(f, SCARG_P32(uap, fd), sizeof(f))) != 0)
                return error;
        retval[0] = 0;
        return 0;
}

int
linux32_sys_dup3(struct lwp *l, const struct linux32_sys_dup3_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(int) from;
                syscallarg(int) to;
                syscallarg(int) flags;
        } */
        struct linux_sys_dup3_args ua;

        NETBSD32TO64_UAP(from);
        NETBSD32TO64_UAP(to);
        NETBSD32TO64_UAP(flags);

        return linux_sys_dup3(l, &ua, retval);
}


int
linux32_sys_openat(struct lwp *l, const struct linux32_sys_openat_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) fd;
                syscallarg(const netbsd32_charp) path;
                syscallarg(int) flags;
                syscallarg(int) mode;
        } */
        struct linux_sys_openat_args ua;

        NETBSD32TO64_UAP(fd);
        NETBSD32TOP_UAP(path, const char);
        NETBSD32TO64_UAP(flags);
        NETBSD32TO64_UAP(mode);

        return linux_sys_openat(l, &ua, retval);
}

int
linux32_sys_mknodat(struct lwp *l, const struct linux32_sys_mknodat_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) fd;
                syscallarg(const netbsd32_charp) path;
                syscallarg(linux_umode_t) mode;
                syscallarg(unsigned) dev;
        } */
        struct linux_sys_mknodat_args ua;

        NETBSD32TO64_UAP(fd);
        NETBSD32TOP_UAP(path, const char);
        NETBSD32TO64_UAP(mode);
        NETBSD32TO64_UAP(dev);

        return linux_sys_mknodat(l, &ua, retval);
}

int
linux32_sys_linkat(struct lwp *l, const struct linux32_sys_linkat_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) fd1;
                syscallarg(netbsd32_charp) name1;
                syscallarg(int) fd2;
                syscallarg(netbsd32_charp) name2;
                syscallarg(int) flags;
        } */
        int fd1 = SCARG(uap, fd1);
        const char *name1 = SCARG_P32(uap, name1);
        int fd2 = SCARG(uap, fd2);
        const char *name2 = SCARG_P32(uap, name2);
        int follow;

        follow = SCARG(uap, flags) & LINUX_AT_SYMLINK_FOLLOW;

        return do_sys_linkat(l, fd1, name1, fd2, name2, follow, retval);
}

int
linux32_sys_unlink(struct lwp *l, const struct linux32_sys_unlink_args *uap, register_t *retval)
{
        /* {
                syscallarg(const netbsd32_charp) path;
        } */
        struct linux_sys_unlink_args ua;

        NETBSD32TOP_UAP(path, const char);

        return linux_sys_unlink(l, &ua, retval);
}

int
linux32_sys_unlinkat(struct lwp *l, const struct linux32_sys_unlinkat_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) fd;
                syscallarg(const netbsd32_charp) path;
                syscallarg(int) flag;
        } */
        struct linux_sys_unlinkat_args ua;

        NETBSD32TO64_UAP(fd);
        NETBSD32TOP_UAP(path, const char);
        NETBSD32TO64_UAP(flag);

        return linux_sys_unlinkat(l, &ua, retval);
}

int
linux32_sys_fchmodat(struct lwp *l, const struct linux32_sys_fchmodat_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) fd;
                syscallarg(netbsd_charp) path;
                syscallarg(linux_umode_t) mode;
        } */

        return do_sys_chmodat(l, SCARG(uap, fd), SCARG_P32(uap, path),
                              SCARG(uap, mode), AT_SYMLINK_FOLLOW);
}

int
linux32_sys_fchownat(struct lwp *l, const struct linux32_sys_fchownat_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) fd;
                syscallarg(netbsd_charp) path;
                syscallarg(uid_t) owner;
                syscallarg(gid_t) group;
                syscallarg(int) flag;
        } */
        int flag;

        flag = linux_to_bsd_atflags(SCARG(uap, flag));
        return do_sys_chownat(l, SCARG(uap, fd), SCARG_P32(uap, path),
                              SCARG(uap, owner), SCARG(uap, group), flag);
}

int
linux32_sys_faccessat(struct lwp *l, const struct linux32_sys_faccessat_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) fd;
                syscallarg(netbsd_charp) path;
                syscallarg(int) amode;
        } */

        return do_sys_accessat(l, SCARG(uap, fd), SCARG_P32(uap, path),
             SCARG(uap, amode), AT_SYMLINK_FOLLOW);
}

int
linux32_sys_utimensat(struct lwp *l, const struct linux32_sys_utimensat_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) fd;
                syscallarg(const netbsd32_charp) path;
                syscallarg(const linux32_timespecp_t) times;
                syscallarg(int) flags;
        } */
        int error;
        struct linux32_timespec lts[2];
        struct timespec *tsp = NULL, ts[2];

        if (SCARG_P32(uap, times)) {
                error = copyin(SCARG_P32(uap, times), &lts, sizeof(lts));
                if (error != 0)
                        return error;
                linux32_to_native_timespec(&ts[0], &lts[0]);
                linux32_to_native_timespec(&ts[1], &lts[1]);
                tsp = ts;
        }

        return linux_do_sys_utimensat(l, SCARG(uap, fd), SCARG_P32(uap, path),
            tsp, SCARG(uap, flag), retval);
}

int
linux32_sys_creat(struct lwp *l, const struct linux32_sys_creat_args *uap, register_t *retval)
{
        /* {
                syscallarg(const netbsd32_charp) path;
                syscallarg(int) mode;
        } */
        struct sys_open_args ua;

        NETBSD32TOP_UAP(path, const char);
        SCARG(&ua, flags) = O_CREAT | O_TRUNC | O_WRONLY;
        NETBSD32TO64_UAP(mode);

        return sys_open(l, &ua, retval);
}

int
linux32_sys_mknod(struct lwp *l, const struct linux32_sys_mknod_args *uap, register_t *retval)
{
        /* {
                syscallarg(const netbsd32_charp) path;
                syscallarg(int) mode;
                syscallarg(int) dev;
        } */
        struct linux_sys_mknod_args ua;

        NETBSD32TOP_UAP(path, const char);
        NETBSD32TO64_UAP(mode);
        NETBSD32TO64_UAP(dev);

        return linux_sys_mknod(l, &ua, retval);
}

#ifdef LINUX32_SYS_break
int
linux32_sys_break(struct lwp *l, const struct linux32_sys_break_args *uap, register_t *retval)
{
#if 0
        /* {
                syscallarg(const netbsd32_charp) nsize;
        } */
#endif

        return ENOSYS;
}
#endif

int
linux32_sys_swapon(struct lwp *l, const struct linux32_sys_swapon_args *uap, register_t *retval)
{
        /* {
                syscallarg(const netbsd32_charp) name;
        } */
        struct sys_swapctl_args ua;

        SCARG(&ua, cmd) = SWAP_ON;
        SCARG(&ua, arg) = SCARG_P32(uap, name);
        SCARG(&ua, misc) = 0;   /* priority */
        return (sys_swapctl(l, &ua, retval));
}

int
linux32_sys_swapoff(struct lwp *l, const struct linux32_sys_swapoff_args *uap, register_t *retval)
{
        /* {
                syscallarg(const netbsd32_charp) path;
        } */
        struct sys_swapctl_args ua;

        SCARG(&ua, cmd) = SWAP_OFF;
        SCARG(&ua, arg) = SCARG_P32(uap, path);
        SCARG(&ua, misc) = 0;   /* priority */
        return (sys_swapctl(l, &ua, retval));
}


int
linux32_sys_reboot(struct lwp *l, const struct linux32_sys_reboot_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) magic1;
                syscallarg(int) magic2;
                syscallarg(int) cmd;
                syscallarg(netbsd32_voidp) arg;
        } */
        struct linux_sys_reboot_args ua;

        NETBSD32TO64_UAP(magic1);
        NETBSD32TO64_UAP(magic2);
        NETBSD32TO64_UAP(cmd);
        NETBSD32TOP_UAP(arg, void);
        
        return linux_sys_reboot(l, &ua, retval);
}

int
linux32_sys_setresuid(struct lwp *l, const struct linux32_sys_setresuid_args *uap, register_t *retval)
{
        /* {
                syscallarg(uid_t) ruid;
                syscallarg(uid_t) euid;
                syscallarg(uid_t) suid;
        } */
        struct linux_sys_setresuid_args ua;

        NETBSD32TO64_UAP(ruid);
        NETBSD32TO64_UAP(euid);
        NETBSD32TO64_UAP(suid);

        return linux_sys_setresuid(l, &ua, retval);
}

int
linux32_sys_getresuid(struct lwp *l, const struct linux32_sys_getresuid_args *uap, register_t *retval)
{
        /* {
                syscallarg(linux32_uidp_t) ruid;
                syscallarg(linux32_uidp_t) euid;
                syscallarg(linux32_uidp_t) suid;
        } */
        kauth_cred_t pc = l->l_cred;
        int error;
        uid_t uid;

        uid = kauth_cred_getuid(pc);
        if ((error = copyout(&uid, SCARG_P32(uap, ruid), sizeof(uid_t))) != 0)
                return error;

        uid = kauth_cred_geteuid(pc);
        if ((error = copyout(&uid, SCARG_P32(uap, euid), sizeof(uid_t))) != 0)
                return error;

        uid = kauth_cred_getsvuid(pc);
        return copyout(&uid, SCARG_P32(uap, suid), sizeof(uid_t));
}

int
linux32_sys_setresgid(struct lwp *l, const struct linux32_sys_setresgid_args *uap, register_t *retval)
{
        /* {
                syscallarg(gid_t) rgid;
                syscallarg(gid_t) egid;
                syscallarg(gid_t) sgid;
        } */
        struct linux_sys_setresgid_args ua;

        NETBSD32TO64_UAP(rgid);
        NETBSD32TO64_UAP(egid);
        NETBSD32TO64_UAP(sgid);

        return linux_sys_setresgid(l, &ua, retval);
}

int
linux32_sys_getresgid(struct lwp *l, const struct linux32_sys_getresgid_args *uap, register_t *retval)
{
        /* {
                syscallarg(linux32_gidp_t) rgid;
                syscallarg(linux32_gidp_t) egid;
                syscallarg(linux32_gidp_t) sgid;
        } */
        kauth_cred_t pc = l->l_cred;
        int error;
        gid_t gid;

        gid = kauth_cred_getgid(pc);
        if ((error = copyout(&gid, SCARG_P32(uap, rgid), sizeof(gid_t))) != 0)
                return error;

        gid = kauth_cred_getegid(pc);
        if ((error = copyout(&gid, SCARG_P32(uap, egid), sizeof(gid_t))) != 0)
                return error;

        gid = kauth_cred_getsvgid(pc);
        return copyout(&gid, SCARG_P32(uap, sgid), sizeof(gid_t));
}

int
linux32_sys_nice(struct lwp *l, const struct linux32_sys_nice_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) incr;
        } */
        struct proc *p = l->l_proc;
        struct sys_setpriority_args bsa;
        int error;

        SCARG(&bsa, which) = PRIO_PROCESS;
        SCARG(&bsa, who) = 0;
        SCARG(&bsa, prio) = p->p_nice - NZERO + SCARG(uap, incr);

        error = sys_setpriority(l, &bsa, retval);
        return (error) ? EPERM : 0;
}

int
linux32_sys_alarm(struct lwp *l, const struct linux32_sys_alarm_args *uap, register_t *retval)
{
        /* {
                syscallarg(unsigned int) secs;
        } */
        struct linux_sys_alarm_args ua;

        NETBSD32TO64_UAP(secs);

        return linux_sys_alarm(l, &ua, retval);
}

int
linux32_sys_fdatasync(struct lwp *l, const struct linux32_sys_fdatasync_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) fd;
        } */
        struct linux_sys_fdatasync_args ua;

        NETBSD32TO64_UAP(fd);

        return linux_sys_fdatasync(l, &ua, retval);
}

int
linux32_sys_setfsuid(struct lwp *l, const struct linux32_sys_setfsuid_args *uap, register_t *retval)
{
        /* {
                syscallarg(uid_t) uid;
        } */
        struct linux_sys_setfsuid_args ua;

        NETBSD32TO64_UAP(uid);

        return linux_sys_setfsuid(l, &ua, retval);
}

int
linux32_sys_setfsgid(struct lwp *l, const struct linux32_sys_setfsgid_args *uap, register_t *retval)
{
        /* {
                syscallarg(gid_t) gid;
        } */
        struct linux_sys_setfsgid_args ua;

        NETBSD32TO64_UAP(gid);

        return linux_sys_setfsgid(l, &ua, retval);
}

/*
 * pread(2).
 */
int
linux32_sys_pread(struct lwp *l,
    const struct linux32_sys_pread_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) fd;
                syscallarg(netbsd32_voidp) buf;
                syscallarg(netbsd32_size_t) nbyte;
                syscallarg(netbsd32_off_t) offset;
        } */
        struct sys_pread_args pra;

        SCARG(&pra, fd) = SCARG(uap, fd);
        SCARG(&pra, buf) = SCARG_P32(uap, buf);
        SCARG(&pra, nbyte) = SCARG(uap, nbyte);
        SCARG(&pra, PAD) = 0;
        SCARG(&pra, offset) = SCARG(uap, offset);

        return sys_pread(l, &pra, retval);
}

/*
 * pwrite(2).
 */
int
linux32_sys_pwrite(struct lwp *l,
    const struct linux32_sys_pwrite_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) fd;
                syscallarg(const netbsd32_voidp) buf;
                syscallarg(netbsd32_size_t) nbyte;
                syscallarg(netbsd32_off_t) offset;
        } */
        struct sys_pwrite_args pra;

        SCARG(&pra, fd) = SCARG(uap, fd);
        SCARG(&pra, buf) = SCARG_P32(uap, buf);
        SCARG(&pra, nbyte) = SCARG(uap, nbyte);
        SCARG(&pra, PAD) = 0;
        SCARG(&pra, offset) = SCARG(uap, offset);

        return sys_pwrite(l, &pra, retval);
}

/*
 * fallocate(2)
 */
int
linux32_sys_fallocate(struct lwp *l,
    const struct linux32_sys_fallocate_args *uap, register_t *retval)
{
        /*
         * For now just return EOPNOTSUPP, this makes glibc posix_fallocate()
         * to fallback to emulation.
         * XXX Right now no filesystem actually implements fallocate support,
         * so no need for mapping.
         */
        return EOPNOTSUPP;
}