Expand PMF_FN_* macros.

[netbsd-mini2440.git] / sys / compat / linux / common / linux_misc.c

/*      $NetBSD: linux_misc.c,v 1.212 2009/11/24 10:42:44 njoly Exp $   */

/*-
 * Copyright (c) 1995, 1998, 1999, 2008 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Frank van der Linden and Eric Haszlakiewicz; by Jason R. Thorpe
 * of the Numerical Aerospace Simulation Facility, NASA Ames Research Center.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

/*
 * Linux compatibility module. Try to deal with various Linux system calls.
 */

/*
 * These functions have been moved to multiarch to allow
 * selection of which machines include them to be
 * determined by the individual files.linux_<arch> files.
 *
 * Function in multiarch:
 *      linux_sys_break                 : linux_break.c
 *      linux_sys_alarm                 : linux_misc_notalpha.c
 *      linux_sys_getresgid             : linux_misc_notalpha.c
 *      linux_sys_nice                  : linux_misc_notalpha.c
 *      linux_sys_readdir               : linux_misc_notalpha.c
 *      linux_sys_setresgid             : linux_misc_notalpha.c
 *      linux_sys_time                  : linux_misc_notalpha.c
 *      linux_sys_utime                 : linux_misc_notalpha.c
 *      linux_sys_waitpid               : linux_misc_notalpha.c
 *      linux_sys_old_mmap              : linux_oldmmap.c
 *      linux_sys_oldolduname           : linux_oldolduname.c
 *      linux_sys_oldselect             : linux_oldselect.c
 *      linux_sys_olduname              : linux_olduname.c
 *      linux_sys_pipe                  : linux_pipe.c
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: linux_misc.c,v 1.212 2009/11/24 10:42:44 njoly Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/dirent.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/filedesc.h>
#include <sys/ioctl.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/prot.h>
#include <sys/reboot.h>
#include <sys/resource.h>
#include <sys/resourcevar.h>
#include <sys/select.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/times.h>
#include <sys/vnode.h>
#include <sys/uio.h>
#include <sys/wait.h>
#include <sys/utsname.h>
#include <sys/unistd.h>
#include <sys/vfs_syscalls.h>
#include <sys/swap.h>           /* for SWAP_ON */
#include <sys/sysctl.h>         /* for KERN_DOMAINNAME */
#include <sys/kauth.h>

#include <sys/ptrace.h>
#include <machine/ptrace.h>

#include <sys/syscall.h>
#include <sys/syscallargs.h>

#include <compat/sys/resource.h>

#include <compat/linux/common/linux_machdep.h>
#include <compat/linux/common/linux_types.h>
#include <compat/linux/common/linux_signal.h>
#include <compat/linux/common/linux_ipc.h>
#include <compat/linux/common/linux_sem.h>

#include <compat/linux/linux_syscallargs.h>

#include <compat/linux/common/linux_fcntl.h>
#include <compat/linux/common/linux_mmap.h>
#include <compat/linux/common/linux_dirent.h>
#include <compat/linux/common/linux_util.h>
#include <compat/linux/common/linux_misc.h>
#ifndef COMPAT_LINUX32
#include <compat/linux/common/linux_statfs.h>
#include <compat/linux/common/linux_limit.h>
#endif
#include <compat/linux/common/linux_ptrace.h>
#include <compat/linux/common/linux_reboot.h>
#include <compat/linux/common/linux_emuldata.h>

#ifndef COMPAT_LINUX32
const int linux_ptrace_request_map[] = {
        LINUX_PTRACE_TRACEME,   PT_TRACE_ME,
        LINUX_PTRACE_PEEKTEXT,  PT_READ_I,
        LINUX_PTRACE_PEEKDATA,  PT_READ_D,
        LINUX_PTRACE_POKETEXT,  PT_WRITE_I,
        LINUX_PTRACE_POKEDATA,  PT_WRITE_D,
        LINUX_PTRACE_CONT,      PT_CONTINUE,
        LINUX_PTRACE_KILL,      PT_KILL,
        LINUX_PTRACE_ATTACH,    PT_ATTACH,
        LINUX_PTRACE_DETACH,    PT_DETACH,
# ifdef PT_STEP
        LINUX_PTRACE_SINGLESTEP,        PT_STEP,
# endif
        LINUX_PTRACE_SYSCALL,   PT_SYSCALL,
        -1
};

const struct linux_mnttypes linux_fstypes[] = {
        { MOUNT_FFS,            LINUX_DEFAULT_SUPER_MAGIC       },
        { MOUNT_NFS,            LINUX_NFS_SUPER_MAGIC           },
        { MOUNT_MFS,            LINUX_DEFAULT_SUPER_MAGIC       },
        { MOUNT_MSDOS,          LINUX_MSDOS_SUPER_MAGIC         },
        { MOUNT_LFS,            LINUX_DEFAULT_SUPER_MAGIC       },
        { MOUNT_FDESC,          LINUX_DEFAULT_SUPER_MAGIC       },
        { MOUNT_NULL,           LINUX_DEFAULT_SUPER_MAGIC       },
        { MOUNT_OVERLAY,        LINUX_DEFAULT_SUPER_MAGIC       },
        { MOUNT_UMAP,           LINUX_DEFAULT_SUPER_MAGIC       },
        { MOUNT_KERNFS,         LINUX_DEFAULT_SUPER_MAGIC       },
        { MOUNT_PROCFS,         LINUX_PROC_SUPER_MAGIC          },
        { MOUNT_AFS,            LINUX_DEFAULT_SUPER_MAGIC       },
        { MOUNT_CD9660,         LINUX_ISOFS_SUPER_MAGIC         },
        { MOUNT_UNION,          LINUX_DEFAULT_SUPER_MAGIC       },
        { MOUNT_ADOSFS,         LINUX_ADFS_SUPER_MAGIC          },
        { MOUNT_EXT2FS,         LINUX_EXT2_SUPER_MAGIC          },
        { MOUNT_CFS,            LINUX_DEFAULT_SUPER_MAGIC       },
        { MOUNT_CODA,           LINUX_CODA_SUPER_MAGIC          },
        { MOUNT_FILECORE,       LINUX_DEFAULT_SUPER_MAGIC       },
        { MOUNT_NTFS,           LINUX_DEFAULT_SUPER_MAGIC       },
        { MOUNT_SMBFS,          LINUX_SMB_SUPER_MAGIC           },
        { MOUNT_PTYFS,          LINUX_DEVPTS_SUPER_MAGIC        },
        { MOUNT_TMPFS,          LINUX_TMPFS_SUPER_MAGIC         }
};
const int linux_fstypes_cnt = sizeof(linux_fstypes) / sizeof(linux_fstypes[0]);

# ifdef DEBUG_LINUX
#define DPRINTF(a)      uprintf a
# else
#define DPRINTF(a)
# endif

/* Local linux_misc.c functions: */
static void linux_to_bsd_mmap_args(struct sys_mmap_args *,
    const struct linux_sys_mmap_args *);
static int linux_mmap(struct lwp *, const struct linux_sys_mmap_args *,
    register_t *, off_t);


/*
 * The information on a terminated (or stopped) process needs
 * to be converted in order for Linux binaries to get a valid signal
 * number out of it.
 */
int
bsd_to_linux_wstat(int st)
{

        int sig;

        if (WIFSIGNALED(st)) {
                sig = WTERMSIG(st);
                if (sig >= 0 && sig < NSIG)
                        st= (st & ~0177) | native_to_linux_signo[sig];
        } else if (WIFSTOPPED(st)) {
                sig = WSTOPSIG(st);
                if (sig >= 0 && sig < NSIG)
                        st = (st & ~0xff00) |
                            (native_to_linux_signo[sig] << 8);
        }
        return st;
}

/*
 * wait4(2).  Passed on to the NetBSD call, surrounded by code to
 * reserve some space for a NetBSD-style wait status, and converting
 * it to what Linux wants.
 */
int
linux_sys_wait4(struct lwp *l, const struct linux_sys_wait4_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) pid;
                syscallarg(int *) status;
                syscallarg(int) options;
                syscallarg(struct rusage50 *) rusage;
        } */
        int error, status, options, linux_options, pid = SCARG(uap, pid);
        struct rusage50 ru50;
        struct rusage ru;
        proc_t *p;

        linux_options = SCARG(uap, options);
        options = WOPTSCHECKED;
        if (linux_options & ~(LINUX_WAIT4_KNOWNFLAGS))
                return (EINVAL);

        if (linux_options & LINUX_WAIT4_WNOHANG)
                options |= WNOHANG;
        if (linux_options & LINUX_WAIT4_WUNTRACED)
                options |= WUNTRACED;
        if (linux_options & LINUX_WAIT4_WALL)
                options |= WALLSIG;
        if (linux_options & LINUX_WAIT4_WCLONE)
                options |= WALTSIG;
# ifdef DIAGNOSTIC
        if (linux_options & LINUX_WAIT4_WNOTHREAD)
                printf("WARNING: %s: linux process %d.%d called "
                       "waitpid with __WNOTHREAD set!",
                       __FILE__, l->l_proc->p_pid, l->l_lid);

# endif

        error = do_sys_wait(&pid, &status, options,
            SCARG(uap, rusage) != NULL ? &ru : NULL);

        retval[0] = pid;
        if (pid == 0)
                return error;

        p = curproc;
        mutex_enter(p->p_lock);
        sigdelset(&p->p_sigpend.sp_set, SIGCHLD); /* XXXAD ksiginfo leak */
        mutex_exit(p->p_lock);

        if (SCARG(uap, rusage) != NULL) {
                rusage_to_rusage50(&ru, &ru50);
                error = copyout(&ru, SCARG(uap, rusage), sizeof(ru));
        }

        if (error == 0 && SCARG(uap, status) != NULL) {
                status = bsd_to_linux_wstat(status);
                error = copyout(&status, SCARG(uap, status), sizeof status);
        }

        return error;
}

/*
 * Linux brk(2). The check if the new address is >= the old one is
 * done in the kernel in Linux. NetBSD does it in the library.
 */
int
linux_sys_brk(struct lwp *l, const struct linux_sys_brk_args *uap, register_t *retval)
{
        /* {
                syscallarg(char *) nsize;
        } */
        struct proc *p = l->l_proc;
        char *nbrk = SCARG(uap, nsize);
        struct sys_obreak_args oba;
        struct vmspace *vm = p->p_vmspace;
        struct linux_emuldata *ed = (struct linux_emuldata*)p->p_emuldata;

        SCARG(&oba, nsize) = nbrk;

        if ((void *) nbrk > vm->vm_daddr && sys_obreak(l, &oba, retval) == 0)
                ed->s->p_break = (char*)nbrk;
        else
                nbrk = ed->s->p_break;

        retval[0] = (register_t)nbrk;

        return 0;
}

/*
 * Implement the fs stat functions. Straightforward.
 */
int
linux_sys_statfs(struct lwp *l, const struct linux_sys_statfs_args *uap, register_t *retval)
{
        /* {
                syscallarg(const char *) path;
                syscallarg(struct linux_statfs *) sp;
        } */
        struct statvfs *sb;
        struct linux_statfs ltmp;
        int error;

        sb = STATVFSBUF_GET();
        error = do_sys_pstatvfs(l, SCARG(uap, path), ST_WAIT, sb);
        if (error == 0) {
                bsd_to_linux_statfs(sb, &ltmp);
                error = copyout(&ltmp, SCARG(uap, sp), sizeof ltmp);
        }
        STATVFSBUF_PUT(sb);

        return error;
}

int
linux_sys_fstatfs(struct lwp *l, const struct linux_sys_fstatfs_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) fd;
                syscallarg(struct linux_statfs *) sp;
        } */
        struct statvfs *sb;
        struct linux_statfs ltmp;
        int error;

        sb = STATVFSBUF_GET();
        error = do_sys_fstatvfs(l, SCARG(uap, fd), ST_WAIT, sb);
        if (error == 0) {
                bsd_to_linux_statfs(sb, &ltmp);
                error = copyout(&ltmp, SCARG(uap, sp), sizeof ltmp);
        }
        STATVFSBUF_PUT(sb);

        return error;
}

/*
 * uname(). Just copy the info from the various strings stored in the
 * kernel, and put it in the Linux utsname structure. That structure
 * is almost the same as the NetBSD one, only it has fields 65 characters
 * long, and an extra domainname field.
 */
int
linux_sys_uname(struct lwp *l, const struct linux_sys_uname_args *uap, register_t *retval)
{
        /* {
                syscallarg(struct linux_utsname *) up;
        } */
        struct linux_utsname luts;

        strlcpy(luts.l_sysname, linux_sysname, sizeof(luts.l_sysname));
        strlcpy(luts.l_nodename, hostname, sizeof(luts.l_nodename));
        strlcpy(luts.l_release, linux_release, sizeof(luts.l_release));
        strlcpy(luts.l_version, linux_version, sizeof(luts.l_version));
        strlcpy(luts.l_machine, LINUX_UNAME_ARCH, sizeof(luts.l_machine));
        strlcpy(luts.l_domainname, domainname, sizeof(luts.l_domainname));

        return copyout(&luts, SCARG(uap, up), sizeof(luts));
}

/* Used directly on: alpha, mips, ppc, sparc, sparc64 */
/* Used indirectly on: arm, i386, m68k */

/*
 * New type Linux mmap call.
 * Only called directly on machines with >= 6 free regs.
 */
int
linux_sys_mmap(struct lwp *l, const struct linux_sys_mmap_args *uap, register_t *retval)
{
        /* {
                syscallarg(unsigned long) addr;
                syscallarg(size_t) len;
                syscallarg(int) prot;
                syscallarg(int) flags;
                syscallarg(int) fd;
                syscallarg(linux_off_t) offset;
        } */

        if (SCARG(uap, offset) & PAGE_MASK)
                return EINVAL;

        return linux_mmap(l, uap, retval, SCARG(uap, offset));
}

/*
 * Guts of most architectures' mmap64() implementations.  This shares
 * its list of arguments with linux_sys_mmap().
 *
 * The difference in linux_sys_mmap2() is that "offset" is actually
 * (offset / pagesize), not an absolute byte count.  This translation
 * to pagesize offsets is done inside glibc between the mmap64() call
 * point, and the actual syscall.
 */
int
linux_sys_mmap2(struct lwp *l, const struct linux_sys_mmap2_args *uap, register_t *retval)
{
        /* {
                syscallarg(unsigned long) addr;
                syscallarg(size_t) len;
                syscallarg(int) prot;
                syscallarg(int) flags;
                syscallarg(int) fd;
                syscallarg(linux_off_t) offset;
        } */

        return linux_mmap(l, uap, retval,
            ((off_t)SCARG(uap, offset)) << PAGE_SHIFT);
}

/*
 * Massage arguments and call system mmap(2).
 */
static int
linux_mmap(struct lwp *l, const struct linux_sys_mmap_args *uap, register_t *retval, off_t offset)
{
        struct sys_mmap_args cma;
        int error;
        size_t mmoff=0;

        linux_to_bsd_mmap_args(&cma, uap);
        SCARG(&cma, pos) = offset;

        if (SCARG(uap, flags) & LINUX_MAP_GROWSDOWN) {
                /*
                 * Request for stack-like memory segment. On linux, this
                 * works by mmap()ping (small) segment, which is automatically
                 * extended when page fault happens below the currently
                 * allocated area. We emulate this by allocating (typically
                 * bigger) segment sized at current stack size limit, and
                 * offsetting the requested and returned address accordingly.
                 * Since physical pages are only allocated on-demand, this
                 * is effectively identical.
                 */
                rlim_t ssl = l->l_proc->p_rlimit[RLIMIT_STACK].rlim_cur;

                if (SCARG(&cma, len) < ssl) {
                        /* Compute the address offset */
                        mmoff = round_page(ssl) - SCARG(uap, len);

                        if (SCARG(&cma, addr))
                                SCARG(&cma, addr) = (char *)SCARG(&cma, addr) - mmoff;

                        SCARG(&cma, len) = (size_t) ssl;
                }
        }

        error = sys_mmap(l, &cma, retval);
        if (error)
                return (error);

        /* Shift the returned address for stack-like segment if necessary */
        retval[0] += mmoff;

        return (0);
}

static void
linux_to_bsd_mmap_args(struct sys_mmap_args *cma, const struct linux_sys_mmap_args *uap)
{
        int flags = MAP_TRYFIXED, fl = SCARG(uap, flags);

        flags |= cvtto_bsd_mask(fl, LINUX_MAP_SHARED, MAP_SHARED);
        flags |= cvtto_bsd_mask(fl, LINUX_MAP_PRIVATE, MAP_PRIVATE);
        flags |= cvtto_bsd_mask(fl, LINUX_MAP_FIXED, MAP_FIXED);
        flags |= cvtto_bsd_mask(fl, LINUX_MAP_ANON, MAP_ANON);
        /* XXX XAX ERH: Any other flags here?  There are more defined... */

        SCARG(cma, addr) = (void *)SCARG(uap, addr);
        SCARG(cma, len) = SCARG(uap, len);
        SCARG(cma, prot) = SCARG(uap, prot);
        if (SCARG(cma, prot) & VM_PROT_WRITE) /* XXX */
                SCARG(cma, prot) |= VM_PROT_READ;
        SCARG(cma, flags) = flags;
        SCARG(cma, fd) = flags & MAP_ANON ? -1 : SCARG(uap, fd);
        SCARG(cma, PAD) = 0;
}

#define LINUX_MREMAP_MAYMOVE    1
#define LINUX_MREMAP_FIXED      2

int
linux_sys_mremap(struct lwp *l, const struct linux_sys_mremap_args *uap, register_t *retval)
{
        /* {
                syscallarg(void *) old_address;
                syscallarg(size_t) old_size;
                syscallarg(size_t) new_size;
                syscallarg(u_long) flags;
        } */

        struct proc *p;
        struct vm_map *map;
        vaddr_t oldva;
        vaddr_t newva;
        size_t oldsize;
        size_t newsize;
        int flags;
        int uvmflags;
        int error;

        flags = SCARG(uap, flags);
        oldva = (vaddr_t)SCARG(uap, old_address);
        oldsize = round_page(SCARG(uap, old_size));
        newsize = round_page(SCARG(uap, new_size));
        if ((flags & ~(LINUX_MREMAP_FIXED|LINUX_MREMAP_MAYMOVE)) != 0) {
                error = EINVAL;
                goto done;
        }
        if ((flags & LINUX_MREMAP_FIXED) != 0) {
                if ((flags & LINUX_MREMAP_MAYMOVE) == 0) {
                        error = EINVAL;
                        goto done;
                }
#if 0 /* notyet */
                newva = SCARG(uap, new_address);
                uvmflags = MAP_FIXED;
#else /* notyet */
                error = EOPNOTSUPP;
                goto done;
#endif /* notyet */
        } else if ((flags & LINUX_MREMAP_MAYMOVE) != 0) {
                uvmflags = 0;
        } else {
                newva = oldva;
                uvmflags = MAP_FIXED;
        }
        p = l->l_proc;
        map = &p->p_vmspace->vm_map;
        error = uvm_mremap(map, oldva, oldsize, map, &newva, newsize, p,
            uvmflags);

done:
        *retval = (error != 0) ? 0 : (register_t)newva;
        return error;
}

int
linux_sys_mprotect(struct lwp *l, const struct linux_sys_mprotect_args *uap, register_t *retval)
{
        /* {
                syscallarg(const void *) start;
                syscallarg(unsigned long) len;
                syscallarg(int) prot;
        } */
        struct vm_map_entry *entry;
        struct vm_map *map;
        struct proc *p;
        vaddr_t end, start, len, stacklim;
        int prot, grows;

        start = (vaddr_t)SCARG(uap, start);
        len = round_page(SCARG(uap, len));
        prot = SCARG(uap, prot);
        grows = prot & (LINUX_PROT_GROWSDOWN | LINUX_PROT_GROWSUP);
        prot &= ~grows;
        end = start + len;

        if (start & PAGE_MASK)
                return EINVAL;
        if (end < start)
                return EINVAL;
        if (end == start)
                return 0;

        if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC))
                return EINVAL;
        if (grows == (LINUX_PROT_GROWSDOWN | LINUX_PROT_GROWSUP))
                return EINVAL;

        p = l->l_proc;
        map = &p->p_vmspace->vm_map;
        vm_map_lock(map);
# ifdef notdef
        VM_MAP_RANGE_CHECK(map, start, end);
# endif
        if (!uvm_map_lookup_entry(map, start, &entry) || entry->start > start) {
                vm_map_unlock(map);
                return ENOMEM;
        }

        /*
         * Approximate the behaviour of PROT_GROWS{DOWN,UP}.
         */

        stacklim = (vaddr_t)p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur;
        if (grows & LINUX_PROT_GROWSDOWN) {
                if (USRSTACK - stacklim <= start && start < USRSTACK) {
                        start = USRSTACK - stacklim;
                } else {
                        start = entry->start;
                }
        } else if (grows & LINUX_PROT_GROWSUP) {
                if (USRSTACK <= end && end < USRSTACK + stacklim) {
                        end = USRSTACK + stacklim;
                } else {
                        end = entry->end;
                }
        }
        vm_map_unlock(map);
        return uvm_map_protect(map, start, end, prot, FALSE);
}

/*
 * This code is partly stolen from src/lib/libc/compat-43/times.c
 */

#define CONVTCK(r)      (r.tv_sec * hz + r.tv_usec / (1000000 / hz))

int
linux_sys_times(struct lwp *l, const struct linux_sys_times_args *uap, register_t *retval)
{
        /* {
                syscallarg(struct times *) tms;
        } */
        struct proc *p = l->l_proc;
        struct timeval t;
        int error;

        if (SCARG(uap, tms)) {
                struct linux_tms ltms;
                struct rusage ru;

                mutex_enter(p->p_lock);
                calcru(p, &ru.ru_utime, &ru.ru_stime, NULL, NULL);
                ltms.ltms_utime = CONVTCK(ru.ru_utime);
                ltms.ltms_stime = CONVTCK(ru.ru_stime);
                ltms.ltms_cutime = CONVTCK(p->p_stats->p_cru.ru_utime);
                ltms.ltms_cstime = CONVTCK(p->p_stats->p_cru.ru_stime);
                mutex_exit(p->p_lock);

                if ((error = copyout(&ltms, SCARG(uap, tms), sizeof ltms)))
                        return error;
        }

        getmicrouptime(&t);

        retval[0] = ((linux_clock_t)(CONVTCK(t)));
        return 0;
}

#undef CONVTCK

/*
 * Linux 'readdir' call. This code is mostly taken from the
 * SunOS getdents call (see compat/sunos/sunos_misc.c), though
 * an attempt has been made to keep it a little cleaner (failing
 * miserably, because of the cruft needed if count 1 is passed).
 *
 * The d_off field should contain the offset of the next valid entry,
 * but in Linux it has the offset of the entry itself. We emulate
 * that bug here.
 *
 * Read in BSD-style entries, convert them, and copy them out.
 *
 * Note that this doesn't handle union-mounted filesystems.
 */
int
linux_sys_getdents(struct lwp *l, const struct linux_sys_getdents_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) fd;
                syscallarg(struct linux_dirent *) dent;
                syscallarg(unsigned int) count;
        } */
        struct dirent *bdp;
        struct vnode *vp;
        char *inp, *tbuf;               /* BSD-format */
        int len, reclen;                /* BSD-format */
        char *outp;                     /* Linux-format */
        int resid, linux_reclen = 0;    /* Linux-format */
        struct file *fp;
        struct uio auio;
        struct iovec aiov;
        struct linux_dirent idb;
        off_t off;              /* true file offset */
        int buflen, error, eofflag, nbytes, oldcall;
        struct vattr va;
        off_t *cookiebuf = NULL, *cookie;
        int ncookies;

        /* fd_getvnode() will use the descriptor for us */
        if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0)
                return (error);

        if ((fp->f_flag & FREAD) == 0) {
                error = EBADF;
                goto out1;
        }

        vp = (struct vnode *)fp->f_data;
        if (vp->v_type != VDIR) {
                error = ENOTDIR;
                goto out1;
        }

        if ((error = VOP_GETATTR(vp, &va, l->l_cred)))
                goto out1;

        nbytes = SCARG(uap, count);
        if (nbytes == 1) {      /* emulating old, broken behaviour */
                nbytes = sizeof (idb);
                buflen = max(va.va_blocksize, nbytes);
                oldcall = 1;
        } else {
                buflen = min(MAXBSIZE, nbytes);
                if (buflen < va.va_blocksize)
                        buflen = va.va_blocksize;
                oldcall = 0;
        }
        tbuf = malloc(buflen, M_TEMP, M_WAITOK);

        vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
        off = fp->f_offset;
again:
        aiov.iov_base = tbuf;
        aiov.iov_len = buflen;
        auio.uio_iov = &aiov;
        auio.uio_iovcnt = 1;
        auio.uio_rw = UIO_READ;
        auio.uio_resid = buflen;
        auio.uio_offset = off;
        UIO_SETUP_SYSSPACE(&auio);
        /*
         * First we read into the malloc'ed buffer, then
         * we massage it into user space, one record at a time.
         */
        error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf,
            &ncookies);
        if (error)
                goto out;

        inp = tbuf;
        outp = (void *)SCARG(uap, dent);
        resid = nbytes;
        if ((len = buflen - auio.uio_resid) == 0)
                goto eof;

        for (cookie = cookiebuf; len > 0; len -= reclen) {
                bdp = (struct dirent *)inp;
                reclen = bdp->d_reclen;
                if (reclen & 3)
                        panic("linux_readdir");
                if (bdp->d_fileno == 0) {
                        inp += reclen;  /* it is a hole; squish it out */
                        if (cookie)
                                off = *cookie++;
                        else
                                off += reclen;
                        continue;
                }
                linux_reclen = LINUX_RECLEN(&idb, bdp->d_namlen);
                if (reclen > len || resid < linux_reclen) {
                        /* entry too big for buffer, so just stop */
                        outp++;
                        break;
                }
                /*
                 * Massage in place to make a Linux-shaped dirent (otherwise
                 * we have to worry about touching user memory outside of
                 * the copyout() call).
                 */
                idb.d_ino = bdp->d_fileno;
                /*
                 * The old readdir() call misuses the offset and reclen fields.
                 */
                if (oldcall) {
                        idb.d_off = (linux_off_t)linux_reclen;
                        idb.d_reclen = (u_short)bdp->d_namlen;
                } else {
                        if (sizeof (idb.d_off) <= 4 && (off >> 32) != 0) {
                                compat_offseterr(vp, "linux_getdents");
                                error = EINVAL;
                                goto out;
                        }
                        idb.d_off = (linux_off_t)off;
                        idb.d_reclen = (u_short)linux_reclen;
                }
                strcpy(idb.d_name, bdp->d_name);
                if ((error = copyout((void *)&idb, outp, linux_reclen)))
                        goto out;
                /* advance past this real entry */
                inp += reclen;
                if (cookie)
                        off = *cookie++; /* each entry points to itself */
                else
                        off += reclen;
                /* advance output past Linux-shaped entry */
                outp += linux_reclen;
                resid -= linux_reclen;
                if (oldcall)
                        break;
        }

        /* if we squished out the whole block, try again */
        if (outp == (void *)SCARG(uap, dent))
                goto again;
        fp->f_offset = off;     /* update the vnode offset */

        if (oldcall)
                nbytes = resid + linux_reclen;

eof:
        *retval = nbytes - resid;
out:
        VOP_UNLOCK(vp, 0);
        if (cookiebuf)
                free(cookiebuf, M_TEMP);
        free(tbuf, M_TEMP);
out1:
        fd_putfile(SCARG(uap, fd));
        return error;
}

/*
 * Even when just using registers to pass arguments to syscalls you can
 * have 5 of them on the i386. So this newer version of select() does
 * this.
 */
int
linux_sys_select(struct lwp *l, const struct linux_sys_select_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) nfds;
                syscallarg(fd_set *) readfds;
                syscallarg(fd_set *) writefds;
                syscallarg(fd_set *) exceptfds;
                syscallarg(struct timeval50 *) timeout;
        } */

        return linux_select1(l, retval, SCARG(uap, nfds), SCARG(uap, readfds),
            SCARG(uap, writefds), SCARG(uap, exceptfds),
            (struct linux_timeval *)SCARG(uap, timeout));
}

/*
 * Common code for the old and new versions of select(). A couple of
 * things are important:
 * 1) return the amount of time left in the 'timeout' parameter
 * 2) select never returns ERESTART on Linux, always return EINTR
 */
int
linux_select1(struct lwp *l, register_t *retval, int nfds, fd_set *readfds,
    fd_set *writefds, fd_set *exceptfds, struct linux_timeval *timeout)
{
        struct timespec ts0, ts1, uts, *ts = NULL;
        struct linux_timeval ltv;
        int error;

        /*
         * Store current time for computation of the amount of
         * time left.
         */
        if (timeout) {
                if ((error = copyin(timeout, &ltv, sizeof(ltv))))
                        return error;
                uts.tv_sec = ltv.tv_sec;
                uts.tv_nsec = ltv.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);
                }
                ts = &uts;
                nanotime(&ts0);
        }

        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);
                ltv.tv_sec = uts.tv_sec;
                ltv.tv_usec = uts.tv_nsec / 1000;
                if ((error = copyout(&ltv, timeout, sizeof(ltv))))
                        return error;
        }

        return 0;
}

/*
 * Set the 'personality' (emulation mode) for the current process. Only
 * accept the Linux personality here (0). This call is needed because
 * the Linux ELF crt0 issues it in an ugly kludge to make sure that
 * ELF binaries run in Linux mode, not SVR4 mode.
 */
int
linux_sys_personality(struct lwp *l, const struct linux_sys_personality_args *uap, register_t *retval)
{
        /* {
                syscallarg(unsigned long) per;
        } */

        switch (SCARG(uap, per)) {
        case LINUX_PER_LINUX:
        case LINUX_PER_QUERY:
                break;
        default:
                return EINVAL;
        }

        retval[0] = LINUX_PER_LINUX;
        return 0;
}

/*
 * We have nonexistent fsuid equal to uid.
 * If modification is requested, refuse.
 */
int
linux_sys_setfsuid(struct lwp *l, const struct linux_sys_setfsuid_args *uap, register_t *retval)
{
         /* {
                 syscallarg(uid_t) uid;
         } */
         uid_t uid;

         uid = SCARG(uap, uid);
         if (kauth_cred_getuid(l->l_cred) != uid)
                 return sys_nosys(l, uap, retval);

         *retval = uid;
         return 0;
}

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

        gid = SCARG(uap, gid);
        if (kauth_cred_getgid(l->l_cred) != gid)
                return sys_nosys(l, uap, retval);

        *retval = gid;
        return 0;
}

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

        /*
         * Note: These checks are a little different than the NetBSD
         * setreuid(2) call performs.  This precisely follows the
         * behavior of the Linux kernel.
         */

        return do_setresuid(l, SCARG(uap, ruid), SCARG(uap, euid),
                            SCARG(uap, suid),
                            ID_R_EQ_R | ID_R_EQ_E | ID_R_EQ_S |
                            ID_E_EQ_R | ID_E_EQ_E | ID_E_EQ_S |
                            ID_S_EQ_R | ID_S_EQ_E | ID_S_EQ_S );
}

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

        /*
         * Linux copies these values out to userspace like so:
         *
         *      1. Copy out ruid.
         *      2. If that succeeds, copy out euid.
         *      3. If both of those succeed, copy out suid.
         */
        uid = kauth_cred_getuid(pc);
        if ((error = copyout(&uid, SCARG(uap, ruid), sizeof(uid_t))) != 0)
                return (error);

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

        uid = kauth_cred_getsvuid(pc);

        return (copyout(&uid, SCARG(uap, suid), sizeof(uid_t)));
}

int
linux_sys_ptrace(struct lwp *l, const struct linux_sys_ptrace_args *uap, register_t *retval)
{
        /* {
                i386, m68k, powerpc: T=int
                alpha, amd64: T=long
                syscallarg(T) request;
                syscallarg(T) pid;
                syscallarg(T) addr;
                syscallarg(T) data;
        } */
        const int *ptr;
        int request;
        int error;

        ptr = linux_ptrace_request_map;
        request = SCARG(uap, request);
        while (*ptr != -1)
                if (*ptr++ == request) {
                        struct sys_ptrace_args pta;

                        SCARG(&pta, req) = *ptr;
                        SCARG(&pta, pid) = SCARG(uap, pid);
                        SCARG(&pta, addr) = (void *)SCARG(uap, addr);
                        SCARG(&pta, data) = SCARG(uap, data);

                        /*
                         * Linux ptrace(PTRACE_CONT, pid, 0, 0) means actually
                         * to continue where the process left off previously.
                         * The same thing is achieved by addr == (void *) 1
                         * on NetBSD, so rewrite 'addr' appropriately.
                         */
                        if (request == LINUX_PTRACE_CONT && SCARG(uap, addr)==0)
                                SCARG(&pta, addr) = (void *) 1;

                        error = sysent[SYS_ptrace].sy_call(l, &pta, retval);
                        if (error)
                                return error;
                        switch (request) {
                        case LINUX_PTRACE_PEEKTEXT:
                        case LINUX_PTRACE_PEEKDATA:
                                error = copyout (retval,
                                    (void *)SCARG(uap, data), 
                                    sizeof *retval);
                                *retval = SCARG(uap, data);
                                break;
                        default:
                                break;
                        }
                        return error;
                }
                else
                        ptr++;

        return LINUX_SYS_PTRACE_ARCH(l, uap, retval);
}

int
linux_sys_reboot(struct lwp *l, const struct linux_sys_reboot_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) magic1;
                syscallarg(int) magic2;
                syscallarg(int) cmd;
                syscallarg(void *) arg;
        } */
        struct sys_reboot_args /* {
                syscallarg(int) opt;
                syscallarg(char *) bootstr;
        } */ sra;
        int error;

        if ((error = kauth_authorize_system(l->l_cred,
            KAUTH_SYSTEM_REBOOT, 0, NULL, NULL, NULL)) != 0)
                return(error);

        if (SCARG(uap, magic1) != LINUX_REBOOT_MAGIC1)
                return(EINVAL);
        if (SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2 &&
            SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2A &&
            SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2B)
                return(EINVAL);

        switch ((unsigned long)SCARG(uap, cmd)) {
        case LINUX_REBOOT_CMD_RESTART:
                SCARG(&sra, opt) = RB_AUTOBOOT;
                break;
        case LINUX_REBOOT_CMD_HALT:
                SCARG(&sra, opt) = RB_HALT;
                break;
        case LINUX_REBOOT_CMD_POWER_OFF:
                SCARG(&sra, opt) = RB_HALT|RB_POWERDOWN;
                break;
        case LINUX_REBOOT_CMD_RESTART2:
                /* Reboot with an argument. */
                SCARG(&sra, opt) = RB_AUTOBOOT|RB_STRING;
                SCARG(&sra, bootstr) = SCARG(uap, arg);
                break;
        case LINUX_REBOOT_CMD_CAD_ON:
                return(EINVAL); /* We don't implement ctrl-alt-delete */
        case LINUX_REBOOT_CMD_CAD_OFF:
                return(0);
        default:
                return(EINVAL);
        }

        return(sys_reboot(l, &sra, retval));
}

/*
 * Copy of compat_12_sys_swapon().
 */
int
linux_sys_swapon(struct lwp *l, const struct linux_sys_swapon_args *uap, register_t *retval)
{
        /* {
                syscallarg(const char *) name;
        } */
        struct sys_swapctl_args ua;

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

/*
 * Stop swapping to the file or block device specified by path.
 */
int
linux_sys_swapoff(struct lwp *l, const struct linux_sys_swapoff_args *uap, register_t *retval)
{
        /* {
                syscallarg(const char *) path;
        } */
        struct sys_swapctl_args ua;

        SCARG(&ua, cmd) = SWAP_OFF;
        SCARG(&ua, arg) = __UNCONST(SCARG(uap, path)); /*XXXUNCONST*/
        return (sys_swapctl(l, &ua, retval));
}

/*
 * Copy of compat_09_sys_setdomainname()
 */
/* ARGSUSED */
int
linux_sys_setdomainname(struct lwp *l, const struct linux_sys_setdomainname_args *uap, register_t *retval)
{
        /* {
                syscallarg(char *) domainname;
                syscallarg(int) len;
        } */
        int name[2];

        name[0] = CTL_KERN;
        name[1] = KERN_DOMAINNAME;
        return (old_sysctl(&name[0], 2, 0, 0, SCARG(uap, domainname),
                            SCARG(uap, len), l));
}

/*
 * sysinfo()
 */
/* ARGSUSED */
int
linux_sys_sysinfo(struct lwp *l, const struct linux_sys_sysinfo_args *uap, register_t *retval)
{
        /* {
                syscallarg(struct linux_sysinfo *) arg;
        } */
        struct linux_sysinfo si;
        struct loadavg *la;

        si.uptime = time_uptime;
        la = &averunnable;
        si.loads[0] = la->ldavg[0] * LINUX_SYSINFO_LOADS_SCALE / la->fscale;
        si.loads[1] = la->ldavg[1] * LINUX_SYSINFO_LOADS_SCALE / la->fscale;
        si.loads[2] = la->ldavg[2] * LINUX_SYSINFO_LOADS_SCALE / la->fscale;
        si.totalram = ctob((u_long)physmem);
        si.freeram = (u_long)uvmexp.free * uvmexp.pagesize;
        si.sharedram = 0;       /* XXX */
        si.bufferram = (u_long)uvmexp.filepages * uvmexp.pagesize;
        si.totalswap = (u_long)uvmexp.swpages * uvmexp.pagesize;
        si.freeswap = 
            (u_long)(uvmexp.swpages - uvmexp.swpginuse) * uvmexp.pagesize;
        si.procs = nprocs;

        /* The following are only present in newer Linux kernels. */
        si.totalbig = 0;
        si.freebig = 0;
        si.mem_unit = 1;

        return (copyout(&si, SCARG(uap, arg), sizeof si));
}

int
linux_sys_getrlimit(struct lwp *l, const struct linux_sys_getrlimit_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) which;
# ifdef LINUX_LARGEFILE64
                syscallarg(struct rlimit *) rlp;
# else
                syscallarg(struct orlimit *) rlp;
# endif
        } */
# ifdef LINUX_LARGEFILE64
        struct rlimit orl;
# else
        struct orlimit orl;
# endif
        int which;

        which = linux_to_bsd_limit(SCARG(uap, which));
        if (which < 0)
                return -which;

        bsd_to_linux_rlimit(&orl, &l->l_proc->p_rlimit[which]);

        return copyout(&orl, SCARG(uap, rlp), sizeof(orl));
}

int
linux_sys_setrlimit(struct lwp *l, const struct linux_sys_setrlimit_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) which;
# ifdef LINUX_LARGEFILE64
                syscallarg(struct rlimit *) rlp;
# else
                syscallarg(struct orlimit *) rlp;
# endif
        } */
        struct rlimit rl;
# ifdef LINUX_LARGEFILE64
        struct rlimit orl;
# else
        struct orlimit orl;
# endif
        int error;
        int which;

        if ((error = copyin(SCARG(uap, rlp), &orl, sizeof(orl))) != 0)
                return error;

        which = linux_to_bsd_limit(SCARG(uap, which));
        if (which < 0)
                return -which;

        linux_to_bsd_rlimit(&rl, &orl);
        return dosetrlimit(l, l->l_proc, which, &rl);
}

# if !defined(__mips__) && !defined(__amd64__)
/* XXX: this doesn't look 100% common, at least mips doesn't have it */
int
linux_sys_ugetrlimit(struct lwp *l, const struct linux_sys_ugetrlimit_args *uap, register_t *retval)
{
        return linux_sys_getrlimit(l, (const void *)uap, retval);
}
# endif

/*
 * This gets called for unsupported syscalls. The difference to sys_nosys()
 * is that process does not get SIGSYS, the call just returns with ENOSYS.
 * This is the way Linux does it and glibc depends on this behaviour.
 */
int
linux_sys_nosys(struct lwp *l, const void *v, register_t *retval)
{
        return (ENOSYS);
}

int
linux_sys_getpriority(struct lwp *l, const struct linux_sys_getpriority_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) which;
                syscallarg(int) who;
        } */
        struct sys_getpriority_args bsa;
        int error;

        SCARG(&bsa, which) = SCARG(uap, which);
        SCARG(&bsa, who) = SCARG(uap, who);

        if ((error = sys_getpriority(l, &bsa, retval)))
                return error;

        *retval = NZERO - *retval;

        return 0;
}

#endif /* !COMPAT_LINUX32 */