/* $NetBSD: linux_misc.c,v 1.267 2024/10/01 16:41:29 riastradh Exp $ */

/* $NetBSD: linux_misc.c,v 1.267 2024/10/01 16:41:29 riastradh 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 1.267 2024/10/01 16:41:29 riastradh Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/dirent.h>
#include <sys/epoll.h>
#include <sys/eventfd.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/poll.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/futex.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/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>
#include <compat/linux/common/linux_statfs.h>
#include <compat/linux/common/linux_limit.h>
#include <compat/linux/common/linux_ptrace.h>
#include <compat/linux/common/linux_reboot.h>
#include <compat/linux/common/linux_emuldata.h>
#include <compat/linux/common/linux_sched.h>

#include <compat/linux/linux_syscallargs.h>

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, __VA_ARGS__)
#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);
static int linux_to_native_wait_options(int);

/*
* 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);
if (linux_options & ~(LINUX_WAIT4_KNOWNFLAGS))
return (EINVAL);

options = linux_to_native_wait_options(linux_options);
# ifdef DIAGNOSTIC
if (linux_options & LINUX_WNOTHREAD)
printf("WARNING: %s: linux process %d.%d called "
"waitpid with __WNOTHREAD set!\n",
__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;
}

/*
* waitid(2). Converting arguments to the NetBSD equivalent and
* calling it.
*/
int
linux_sys_waitid(struct lwp *l, const struct linux_sys_waitid_args *uap, register_t *retval)
{
/* {
syscallarg(int) idtype;
syscallarg(id_t) id;
syscallarg(linux_siginfo_t *) infop;
syscallarg(int) options;
syscallarg(struct rusage50 *) rusage;
} */
int error, linux_options, options, linux_idtype, status;
pid_t pid;
idtype_t idtype;
id_t id;
siginfo_t info;
linux_siginfo_t linux_info;
struct wrusage wru;
struct rusage50 ru50;

linux_idtype = SCARG(uap, idtype);
switch (linux_idtype) {
case LINUX_P_ALL:
idtype = P_ALL;
break;
case LINUX_P_PID:
idtype = P_PID;
break;
case LINUX_P_PGID:
idtype = P_PGID;
break;
case LINUX_P_PIDFD:
return EOPNOTSUPP;
default:
return EINVAL;
}

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

options = linux_to_native_wait_options(linux_options);
id = SCARG(uap, id);

error = do_sys_waitid(idtype, id, &pid, &status, options, &wru, &info);
if (pid == 0 && options & WNOHANG) {
info.si_signo = 0;
info.si_pid = 0;
}

if (error == 0 && SCARG(uap, infop) != NULL) {
/* POSIX says that this NULL check is a bug, but Linux does this. */
native_to_linux_siginfo(&linux_info, &info._info);
error = copyout(&linux_info, SCARG(uap, infop), sizeof(linux_info));
}

if (error == 0 && SCARG(uap, rusage) != NULL) {
rusage_to_rusage50(&wru.wru_children, &ru50);
error = copyout(&ru50, SCARG(uap, rusage), sizeof(ru50));
}

return error;
}

/*
* Convert the options argument for wait4(2) and waitid(2) from what
* Linux wants to what NetBSD wants.
*/
static int
linux_to_native_wait_options(int linux_options)
{
int options = 0;

if (linux_options & LINUX_WNOHANG)
options |= WNOHANG;
if (linux_options & LINUX_WUNTRACED)
options |= WUNTRACED;
if (linux_options & LINUX_WEXITED)
options |= WEXITED;
if (linux_options & LINUX_WCONTINUED)
options |= WCONTINUED;
if (linux_options & LINUX_WNOWAIT)
options |= WNOWAIT;
if (linux_options & LINUX_WALL)
options |= WALLSIG;
if (linux_options & LINUX_WCLONE)
options |= WALTSIG;

return options;
}

/*
* Linux brk(2). Like native, but always return the new break value.
*/
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;
struct vmspace *vm = p->p_vmspace;
struct sys_obreak_args oba;

SCARG(&oba, nsize) = SCARG(uap, nsize);

(void) sys_obreak(l, &oba, retval);
retval[0] = (register_t)((char *)vm->vm_daddr + ptoa(vm->vm_dsize));
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;

memset(&luts, 0, sizeof(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);
flags |= cvtto_bsd_mask(fl, LINUX_MAP_LOCKED, MAP_WIRED);
/* 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;
}

#ifdef USRSTACK
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_user(l, start, end, prot);
}
#endif /* USRSTACK */

/*
* 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;

memset(&ltms, 0, sizeof(ltms));

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

#if !defined(__aarch64__)
/*
* 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;
}

vn_lock(vp, LK_SHARED | LK_RETRY);
error = VOP_GETATTR(vp, &va, l->l_cred);
VOP_UNLOCK(vp);
if (error)
goto out1;

nbytes = SCARG(uap, count);
if (nbytes == 1) { /* emulating old, broken behaviour */
nbytes = sizeof (idb);
buflen = uimax(va.va_blocksize, nbytes);
oldcall = 1;
} else {
buflen = uimin(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) {
error = EIO;
goto out;
}
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).
*/
memset(&idb, 0, sizeof(idb));
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;
/* Linux puts d_type at the end of each record */
*((char *)&idb + idb.d_reclen - 1) = bdp->d_type;
}
memcpy(idb.d_name, bdp->d_name,
MIN(sizeof(idb.d_name), bdp->d_namlen + 1));
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)) {
if (cookiebuf)
free(cookiebuf, M_TEMP);
cookiebuf = NULL;
goto again;
}
fp->f_offset = off; /* update the vnode offset */

if (oldcall)
nbytes = resid + linux_reclen;

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

#if !defined(__aarch64__)
/*
* 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 = (long)((unsigned long)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;
}
#endif

/*
* Derived from FreeBSD's sys/compat/linux/linux_misc.c:linux_pselect6()
* which was contributed by Dmitry Chagin
* https://svnweb.freebsd.org/base?view=revision&revision=283403
*/
int
linux_sys_pselect6(struct lwp *l,
const struct linux_sys_pselect6_args *uap, register_t *retval)
{
/* {
syscallarg(int) nfds;
syscallarg(fd_set *) readfds;
syscallarg(fd_set *) writefds;
syscallarg(fd_set *) exceptfds;
syscallarg(struct timespec *) timeout;
syscallarg(linux_sized_sigset_t *) ss;
} */
struct timespec uts, ts0, ts1, *tsp;
linux_sized_sigset_t lsss;
struct linux_timespec lts;
linux_sigset_t lss;
sigset_t *ssp;
sigset_t ss;
int error;

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

if (SCARG(uap, timeout) != NULL) {
error = copyin(SCARG(uap, timeout), &lts, sizeof(lts));
if (error != 0)
return (error);
linux_to_native_timespec(&uts, &lts);

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

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

error = selcommon(retval, SCARG(uap, nfds), SCARG(uap, readfds),
SCARG(uap, writefds), SCARG(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_linux_timespec(&lts, &uts);
error = copyout(&lts, SCARG(uap, timeout), sizeof(lts));
}

return (error);
}

int
linux_sys_ppoll(struct lwp *l,
const struct linux_sys_ppoll_args *uap, register_t *retval)
{
/* {
syscallarg(struct pollfd *) fds;
syscallarg(u_int) nfds;
syscallarg(struct linux_timespec *) timeout;
syscallarg(linux_sigset_t *) sigset;
} */
struct linux_timespec lts0, *lts;
struct timespec ts0, *ts = NULL;
linux_sigset_t lsigmask0, *lsigmask;
sigset_t sigmask0, *sigmask = NULL;
int error;

lts = SCARG(uap, timeout);
if (lts) {
if ((error = copyin(lts, &lts0, sizeof(lts0))) != 0)
return error;
linux_to_native_timespec(&ts0, &lts0);
ts = &ts0;
}

lsigmask = SCARG(uap, sigset);
if (lsigmask) {
if ((error = copyin(lsigmask, &lsigmask0, sizeof(lsigmask0))))
return error;
linux_to_native_sigset(&sigmask0, &lsigmask0);
sigmask = &sigmask0;
}

return pollcommon(retval, SCARG(uap, fds), SCARG(uap, nfds),
ts, sigmask);
}

/*
* 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;
} */
struct linux_emuldata *led;
int per;

per = SCARG(uap, per);
led = l->l_emuldata;
if (per == LINUX_PER_QUERY) {
retval[0] = led->led_personality;
return 0;
}

switch (per & LINUX_PER_MASK) {
case LINUX_PER_LINUX:
case LINUX_PER_LINUX32:
led->led_personality = per;
break;

default:
return EINVAL;
}

retval[0] = per;
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;
int64_t filepg;

memset(&si, 0, sizeof(si));
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);
/* uvm_availmem() may sync the counters. */
si.freeram = (u_long)uvm_availmem(true) * uvmexp.pagesize;
filepg = cpu_count_get(CPU_COUNT_FILECLEAN) +
cpu_count_get(CPU_COUNT_FILEDIRTY) +
cpu_count_get(CPU_COUNT_FILEUNKNOWN) -
cpu_count_get(CPU_COUNT_EXECPAGES);
si.sharedram = 0; /* XXX */
si.bufferram = (u_long)(filepg * uvmexp.pagesize);
si.totalswap = (u_long)uvmexp.swpages * uvmexp.pagesize;
si.freeswap =
(u_long)(uvmexp.swpages - uvmexp.swpginuse) * uvmexp.pagesize;
si.procs = atomic_load_relaxed(&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;

memset(&orl, 0, sizeof(orl));
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(__aarch64__) && !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

int
linux_sys_prlimit64(struct lwp *l, const struct linux_sys_prlimit64_args *uap, register_t *retval)
{
/* {
syscallarg(pid_t) pid;
syscallarg(int) witch;
syscallarg(struct rlimit *) new_rlp;
syscallarg(struct rlimit *) old_rlp;
}; */
struct rlimit rl, nrl, orl;
struct rlimit *p;
int which;
int error;

/* XXX: Cannot operate any process other than its own */
if (SCARG(uap, pid) != 0)
return EPERM;

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

p = SCARG(uap, old_rlp);
if (p != NULL) {
memset(&orl, 0, sizeof(orl));
bsd_to_linux_rlimit64(&orl, &l->l_proc->p_rlimit[which]);
if ((error = copyout(&orl, p, sizeof(orl))) != 0)
return error;
}

p = SCARG(uap, new_rlp);
if (p != NULL) {
if ((error = copyin(p, &nrl, sizeof(nrl))) != 0)
return error;

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

return 0;
}

/*
* 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;
}

int
linux_do_sys_utimensat(struct lwp *l, int fd, const char *path, struct timespec *tsp, int flags, register_t *retval)
{
int follow, error;

follow = (flags & LINUX_AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;

if (path == NULL && fd != AT_FDCWD) {
file_t *fp;

/* fd_getvnode() will use the descriptor for us */
if ((error = fd_getvnode(fd, &fp)) != 0)
return error;
error = do_sys_utimensat(l, AT_FDCWD, fp->f_data, NULL, 0,
tsp, UIO_SYSSPACE);
fd_putfile(fd);
return error;
}

return do_sys_utimensat(l, fd, NULL, path, follow, tsp, UIO_SYSSPACE);
}

int
linux_sys_utimensat(struct lwp *l, const struct linux_sys_utimensat_args *uap,
register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(const char *) path;
syscallarg(const struct linux_timespec *) times;
syscallarg(int) flag;
} */
int error;
struct linux_timespec lts[2];
struct timespec *tsp = NULL, ts[2];

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

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

int
linux_sys_futex(struct lwp *l, const struct linux_sys_futex_args *uap,
register_t *retval)
{
/* {
syscallarg(int *) uaddr;
syscallarg(int) op;
syscallarg(int) val;
syscallarg(const struct linux_timespec *) timeout;
syscallarg(int *) uaddr2;
syscallarg(int) val3;
} */
struct linux_timespec lts;
struct timespec ts, *tsp = NULL;
int val2 = 0;
int error;

/*
* Linux overlays the "timeout" field and the "val2" field.
* "timeout" is only valid for FUTEX_WAIT and FUTEX_WAIT_BITSET
* on Linux.
*/
const int op = (SCARG(uap, op) & FUTEX_CMD_MASK);
if ((op == FUTEX_WAIT || op == FUTEX_WAIT_BITSET) &&
SCARG(uap, timeout) != NULL) {
if ((error = copyin(SCARG(uap, timeout),
&lts, sizeof(lts))) != 0) {
return error;
}
linux_to_native_timespec(&ts, &lts);
tsp = &ts;
} else {
val2 = (int)(uintptr_t)SCARG(uap, timeout);
}

return linux_do_futex(SCARG(uap, uaddr), SCARG(uap, op),
SCARG(uap, val), tsp, SCARG(uap, uaddr2), val2,
SCARG(uap, val3), retval);
}

int
linux_do_futex(int *uaddr, int op, int val, struct timespec *timeout,
int *uaddr2, int val2, int val3, register_t *retval)
{
/*
* Always clear FUTEX_PRIVATE_FLAG for Linux processes.
* NetBSD-native futexes exist in different namespace
* depending on FUTEX_PRIVATE_FLAG. This appears not
* to be the case in Linux, and some futex users will
* mix private and non-private ops on the same futex
* object.
*/
return do_futex(uaddr, op & ~FUTEX_PRIVATE_FLAG,
val, timeout, uaddr2, val2, val3, retval);
}

#define LINUX_EFD_SEMAPHORE 0x0001
#define LINUX_EFD_CLOEXEC LINUX_O_CLOEXEC
#define LINUX_EFD_NONBLOCK LINUX_O_NONBLOCK

static int
linux_do_eventfd2(struct lwp *l, unsigned int initval, int flags,
register_t *retval)
{
int nflags = 0;

if (flags & ~(LINUX_EFD_SEMAPHORE | LINUX_EFD_CLOEXEC |
LINUX_EFD_NONBLOCK)) {
return EINVAL;
}
if (flags & LINUX_EFD_SEMAPHORE) {
nflags |= EFD_SEMAPHORE;
}
if (flags & LINUX_EFD_CLOEXEC) {
nflags |= EFD_CLOEXEC;
}
if (flags & LINUX_EFD_NONBLOCK) {
nflags |= EFD_NONBLOCK;
}

return do_eventfd(l, initval, nflags, retval);
}

int
linux_sys_eventfd(struct lwp *l, const struct linux_sys_eventfd_args *uap,
register_t *retval)
{
/* {
syscallarg(unsigned int) initval;
} */

return linux_do_eventfd2(l, SCARG(uap, initval), 0, retval);
}

int
linux_sys_eventfd2(struct lwp *l, const struct linux_sys_eventfd2_args *uap,
register_t *retval)
{
/* {
syscallarg(unsigned int) initval;
syscallarg(int) flags;
} */

return linux_do_eventfd2(l, SCARG(uap, initval), SCARG(uap, flags),
retval);
}

#ifndef __aarch64__
/*
* epoll_create(2). Check size and call sys_epoll_create1.
*/
int
linux_sys_epoll_create(struct lwp *l,
const struct linux_sys_epoll_create_args *uap, register_t *retval)
{
/* {
syscallarg(int) size;
} */
struct sys_epoll_create1_args ca;

/*
* SCARG(uap, size) is unused. Linux just tests it and then
* forgets it as well.
*/
if (SCARG(uap, size) <= 0)
return EINVAL;

SCARG(&ca, flags) = 0;
return sys_epoll_create1(l, &ca, retval);
}
#endif /* !__aarch64__ */

/*
* epoll_create1(2). Translate the flags and call sys_epoll_create1.
*/
int
linux_sys_epoll_create1(struct lwp *l,
const struct linux_sys_epoll_create1_args *uap, register_t *retval)
{
/* {
syscallarg(int) flags;
} */
struct sys_epoll_create1_args ca;

if ((SCARG(uap, flags) & ~(LINUX_O_CLOEXEC)) != 0)
return EINVAL;

SCARG(&ca, flags) = 0;
if ((SCARG(uap, flags) & LINUX_O_CLOEXEC) != 0)
SCARG(&ca, flags) |= EPOLL_CLOEXEC;

return sys_epoll_create1(l, &ca, retval);
}

/*
* epoll_ctl(2). Copyin event and translate it if necessary and then
* call epoll_ctl_common().
*/
int
linux_sys_epoll_ctl(struct lwp *l, const struct linux_sys_epoll_ctl_args *uap,
register_t *retval)
{
/* {
syscallarg(int) epfd;
syscallarg(int) op;
syscallarg(int) fd;
syscallarg(struct linux_epoll_event *) event;
} */
struct linux_epoll_event lee;
struct epoll_event ee;
struct epoll_event *eep;
int error;

if (SCARG(uap, op) != EPOLL_CTL_DEL) {
error = copyin(SCARG(uap, event), &lee, sizeof(lee));
if (error != 0)
return error;

/*
* On some architectures, struct linux_epoll_event and
* struct epoll_event are packed differently... but otherwise
* the contents are the same.
*/
ee.events = lee.events;
ee.data = lee.data;

eep = &ee;
} else
eep = NULL;

return epoll_ctl_common(l, retval, SCARG(uap, epfd), SCARG(uap, op),
SCARG(uap, fd), eep);
}

#ifndef __aarch64__
/*
* epoll_wait(2). Call sys_epoll_pwait().
*/
int
linux_sys_epoll_wait(struct lwp *l,
const struct linux_sys_epoll_wait_args *uap, register_t *retval)
{
/* {
syscallarg(int) epfd;
syscallarg(struct linux_epoll_event *) events;
syscallarg(int) maxevents;
syscallarg(int) timeout;
} */
struct linux_sys_epoll_pwait_args ea;

SCARG(&ea, epfd) = SCARG(uap, epfd);
SCARG(&ea, events) = SCARG(uap, events);
SCARG(&ea, maxevents) = SCARG(uap, maxevents);
SCARG(&ea, timeout) = SCARG(uap, timeout);
SCARG(&ea, sigmask) = NULL;

return linux_sys_epoll_pwait(l, &ea, retval);
}
#endif /* !__aarch64__ */

/*
* Main body of epoll_pwait2(2). Translate timeout and sigmask and
* call epoll_wait_common.
*/
static int
linux_epoll_pwait2_common(struct lwp *l, register_t *retval, int epfd,
struct linux_epoll_event *events, int maxevents,
struct linux_timespec *timeout, const linux_sigset_t *sigmask)
{
struct timespec ts, *tsp;
linux_sigset_t lss;
sigset_t ss, *ssp;
struct epoll_event *eep;
struct linux_epoll_event *leep;
int i, error;

if (maxevents <= 0 || maxevents > EPOLL_MAX_EVENTS)
return EINVAL;

if (timeout != NULL) {
linux_to_native_timespec(&ts, timeout);
tsp = &ts;
} else
tsp = NULL;

if (sigmask != NULL) {
error = copyin(sigmask, &lss, sizeof(lss));
if (error != 0)
return error;

linux_to_native_sigset(&ss, &lss);
ssp = &ss;
} else
ssp = NULL;

eep = kmem_alloc(maxevents * sizeof(*eep), KM_SLEEP);

error = epoll_wait_common(l, retval, epfd, eep, maxevents, tsp,
ssp);
if (error == 0 && *retval > 0) {
leep = kmem_alloc((*retval) * sizeof(*leep), KM_SLEEP);

/* Translate the events (because of packing). */
for (i = 0; i < *retval; i++) {
leep[i].events = eep[i].events;
leep[i].data = eep[i].data;
}

error = copyout(leep, events, (*retval) * sizeof(*leep));
kmem_free(leep, (*retval) * sizeof(*leep));
}

kmem_free(eep, maxevents * sizeof(*eep));
return error;
}

/*
* epoll_pwait(2). Translate timeout and call sys_epoll_pwait2.
*/
int
linux_sys_epoll_pwait(struct lwp *l,
const struct linux_sys_epoll_pwait_args *uap, register_t *retval)
{
/* {
syscallarg(int) epfd;
syscallarg(struct linux_epoll_event *) events;
syscallarg(int) maxevents;
syscallarg(int) timeout;
syscallarg(linux_sigset_t *) sigmask;
} */
struct linux_timespec lts, *ltsp;
const int timeout = SCARG(uap, timeout);

if (timeout >= 0) {
/* Convert from milliseconds to timespec. */
lts.tv_sec = timeout / 1000;
lts.tv_nsec = (timeout % 1000) * 1000000;

ltsp = &lts;
} else
ltsp = NULL;

return linux_epoll_pwait2_common(l, retval, SCARG(uap, epfd),
SCARG(uap, events), SCARG(uap, maxevents), ltsp,
SCARG(uap, sigmask));
}

/*
* epoll_pwait2(2). Copyin timeout and call linux_epoll_pwait2_common().
*/
int
linux_sys_epoll_pwait2(struct lwp *l,
const struct linux_sys_epoll_pwait2_args *uap, register_t *retval)
{
/* {
syscallarg(int) epfd;
syscallarg(struct linux_epoll_event *) events;
syscallarg(int) maxevents;
syscallarg(struct linux_timespec *) timeout;
syscallarg(linux_sigset_t *) sigmask;
} */
struct linux_timespec lts, *ltsp;
int error;

if (SCARG(uap, timeout) != NULL) {
error = copyin(SCARG(uap, timeout), &lts, sizeof(lts));
if (error != 0)
return error;

ltsp = &lts;
} else
ltsp = NULL;

return linux_epoll_pwait2_common(l, retval, SCARG(uap, epfd),
SCARG(uap, events), SCARG(uap, maxevents), ltsp,
SCARG(uap, sigmask));
}

#define LINUX_MFD_CLOEXEC 0x0001U
#define LINUX_MFD_ALLOW_SEALING 0x0002U
#define LINUX_MFD_HUGETLB 0x0004U
#define LINUX_MFD_NOEXEC_SEAL 0x0008U
#define LINUX_MFD_EXEC 0x0010U
#define LINUX_MFD_HUGE_FLAGS (0x3f << 26)

#define LINUX_MFD_ALL_FLAGS (LINUX_MFD_CLOEXEC|LINUX_MFD_ALLOW_SEALING \
|LINUX_MFD_HUGETLB|LINUX_MFD_NOEXEC_SEAL \
|LINUX_MFD_EXEC|LINUX_MFD_HUGE_FLAGS)
#define LINUX_MFD_KNOWN_FLAGS (LINUX_MFD_CLOEXEC|LINUX_MFD_ALLOW_SEALING)

#define LINUX_MFD_NAME_MAX 249

/*
* memfd_create(2). Do some error checking and then call NetBSD's
* version.
*/
int
linux_sys_memfd_create(struct lwp *l,
const struct linux_sys_memfd_create_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) name;
syscallarg(unsigned int) flags;
} */
int error;
char *pbuf;
struct sys_memfd_create_args muap;
const unsigned int lflags = SCARG(uap, flags);

KASSERT(LINUX_MFD_NAME_MAX < NAME_MAX); /* sanity check */

if (lflags & ~LINUX_MFD_ALL_FLAGS)
return EINVAL;
if ((lflags & LINUX_MFD_HUGE_FLAGS) != 0 &&
(lflags & LINUX_MFD_HUGETLB) == 0)
return EINVAL;
if ((lflags & LINUX_MFD_HUGETLB) && (lflags & LINUX_MFD_ALLOW_SEALING))
return EINVAL;

/* Linux has a stricter limit for name size */
pbuf = PNBUF_GET();
error = copyinstr(SCARG(uap, name), pbuf, LINUX_MFD_NAME_MAX+1, NULL);
PNBUF_PUT(pbuf);
pbuf = NULL;
if (error != 0) {
if (error == ENAMETOOLONG)
error = EINVAL;
return error;
}

if (lflags & ~LINUX_MFD_KNOWN_FLAGS) {
DPRINTF("%s: ignored flags %#x\n", __func__,
lflags & ~LINUX_MFD_KNOWN_FLAGS);
}

SCARG(&muap, name) = SCARG(uap, name);
SCARG(&muap, flags) = lflags & LINUX_MFD_KNOWN_FLAGS;

return sys_memfd_create(l, &muap, retval);
}

#define LINUX_CLOSE_RANGE_UNSHARE 0x02U
#define LINUX_CLOSE_RANGE_CLOEXEC 0x04U

/*
* close_range(2).
*/
int
linux_sys_close_range(struct lwp *l,
const struct linux_sys_close_range_args *uap, register_t *retval)
{
/* {
syscallarg(unsigned int) first;
syscallarg(unsigned int) last;
syscallarg(unsigned int) flags;
} */
unsigned int fd, last;
file_t *fp;
filedesc_t *fdp;
const unsigned int flags = SCARG(uap, flags);

if (flags & ~(LINUX_CLOSE_RANGE_CLOEXEC|LINUX_CLOSE_RANGE_UNSHARE))
return EINVAL;
if (SCARG(uap, first) > SCARG(uap, last))
return EINVAL;

if (flags & LINUX_CLOSE_RANGE_UNSHARE) {
fdp = fd_copy();
fd_free();
l->l_proc->p_fd = fdp;
l->l_fd = fdp;
}

last = MIN(SCARG(uap, last), l->l_proc->p_fd->fd_lastfile);
for (fd = SCARG(uap, first); fd <= last; fd++) {
fp = fd_getfile(fd);
if (fp == NULL)
continue;

if (flags & LINUX_CLOSE_RANGE_CLOEXEC) {
fd_set_exclose(l, fd, true);
fd_putfile(fd);
} else
fd_close(fd);
}

return 0;
}

/*
* readahead(2). Call posix_fadvise with POSIX_FADV_WILLNEED with some extra
* error checking.
*/
int
linux_sys_readahead(struct lwp *l, const struct linux_sys_readahead_args *uap,
register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(off_t) offset;
syscallarg(size_t) count;
} */
file_t *fp;
int error = 0;
const int fd = SCARG(uap, fd);

fp = fd_getfile(fd);
if (fp == NULL)
return EBADF;
if ((fp->f_flag & FREAD) == 0)
error = EBADF;
else if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VREG)
error = EINVAL;
fd_putfile(fd);
if (error != 0)
return error;

return do_posix_fadvise(fd, SCARG(uap, offset), SCARG(uap, count),
POSIX_FADV_WILLNEED);
}

int
linux_sys_getcpu(lwp_t *l, const struct linux_sys_getcpu_args *uap,
register_t *retval)
{
/* {
syscallarg(unsigned int *) cpu;
syscallarg(unsigned int *) node;
syscallarg(struct linux_getcpu_cache *) tcache;
}*/
int error;

if (SCARG(uap, cpu)) {
u_int cpu_id = l->l_cpu->ci_data.cpu_index;
error = copyout(&cpu_id, SCARG(uap, cpu), sizeof(cpu_id));
if (error)
return error;

}

// TO-DO: Test on a NUMA machine if the node_id returned is correct
if (SCARG(uap, node)) {
u_int node_id = l->l_cpu->ci_data.cpu_numa_id;
error = copyout(&node_id, SCARG(uap, node), sizeof(node_id));
if (error)
return error;
}

return 0;
}