Regen

regen

Pointed out by: brooks

regen

Remove never implemented sbrk and sstk syscalls

Both system calls were stubs returning EOPNOTSUPP and libc did not
provide _ or __sys_ prefixed symbols. The actual implementation of
sbrk(2) is on top of the undocumented break(2) system call.

Technically this is a change in ABI, but no non-contrived program ever
called these syscalls.

Reviewed by: kib, emaste
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D42872

freebsd32: Remove mac_syscall from the unimpl list

The mac_syscall system call works fine as long as any MAC module
that provides a mpo_syscall method handles compat32 appropriately.

Regenerate system call files for freebsd32.

Reviewed by: sjg
Obtained from: Juniper Networks, Inc.
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D41575

timerfd: Move implementation from linux compat to sys/kern

Move the timerfd impelemntation from linux compat code to sys/kern. Use
it to implement the new system calls for timerfd. Add a hook to kern_tc
to allow timerfd to know when the system time has stepped. Add kqueue
support to timerfd. Adjust a few names to be less Linux centric.

RelNotes: YES
Reviewed by: markj (on irc), imp, kib (with reservations), jhb (slack)
Differential Revision: https://reviews.freebsd.org/D38459

Regen

Regenerate sysent stuff after $FreeBSD$ removal

Sponsored by: Netflix

freebsd32: Regen

Need to regen freebsd32 as well when sys/kern/syscalls.master is
updated.

Sponsored by: Netflix

Regen

Regen

sysent: regen after 52a1d90c8bfe, posix_fadvise in capmode

sysent: regen for syscallarg_t

Revert "syscallarg_t: Add a type for system call arguments"

Missed issues in truss on at least armv7 and powerpcspe need to be
resolved before recommit.

This reverts commit 3889fb8af0b611e3126dc250ebffb01805152104.
This reverts commit 1544e0f5d1f1e3b8c10a64cb899a936976ca7ea4.

sysent: regen for syscallarg_t

Regen

syscalls: regen

syscalls: regen

syscalls: regen

freebsd32: regen

freebsd32: remove unnecessicary headers

Reviewed by: kib

freebsd32: regen

freebsd32: regen

fspacectl: remove unneeded freebsd32 wrapper

fspacectl(2) does not require special handling on freebsd32. The
presence of off_t in a struct does not cause it's size to change
between the native ABI and the 32-bit ABI supported by freebsd32
because off_t is always int64_t on BSD systems. Further, byte
order only requires handling for paired argument or return registers.

(32-byte alignment of 64-bit objects on i386 can require special
handling, but that situtation does not apply here.)

Reviewed by: kib, khng, emaste, delphij
Differential Revision: https://reviews.freebsd.org/D32994

freebsd32: sync some audit types with default ABI

Reviewed by: kevans

freebsd32: update unimplemented syscall comments

These were out of sync with sys/kern/syscalls.master

Reviewed by: kevans

freebsd32: tag RESERVED syscalls

This reduces diffs when generating freebsd32 files from the default
ABI's syscalls.master.

Reviewed by: kevans

freebsd32: fix getfsstat sign extension bugs

Add freebsd32 versions of getfsstat and freebsd11_getfsstat so that
bufsize is properly sign-extended if a negative value is passed.
Reject negative values before passing to kern_getfsstat as a size_t.

Reviewed by: kevans

freebsd32: signed long corrections

Syscalls that take signed longs need to treat the 32-bit versions as
signed int so that sign extension happens correctly. Improve
decleration quality and add a few minimal syscall implementations.

Reviewed by: kevans

freebsd32: add missing pads to preadv and pwritev

Reviewed by: kevans

freebsd32: add stubs for ofreebsd32_(send|recv)msg

The upcoming change to generate freebsd32 generated files from
sys/kern/syscalls.master doesn't have a way to handle disabling
this one without disabling the non-COMPAT counterpart so just add
a stub for now.

Reviewed by: kevans

freebsd32: add real abort2

Previously, the code would copy twice as many pointers as specified
and print pairs of them a single 64-bit pointer.

abort2 doesn't return so make the return type void

freebsd32_abort2 is in it's own file with a 2-clause BSD license
based on a discussion with Wojciech many years ago.

Reviewed by: kevans

freebsd32: add feed foward clock syscalls

These are required when supporting i386 because time_t is 32-bit which
reduces struct bintime to 12-bytes when combined with the fact that 64-bit
integers only requiring 32-bit alignment on i386. Reusing the default
ABI version resulted in 4-byte overreads or overwrites to userspace.

Reviewed by: kevans

freebsd32: enable trivial syscalls

These syscalls require no translation. They were simply missing
from compat/freebsd32/syscalls.master.

Reviewed by: kevans

freebsd32: don't implement kldsym

Previously we fell back to sys_kldsym, but because we'd always
mismatch on the version field we'd return EINVAL. A freebsd32
implementation is impossible with the current ABI as there simply
isn't space to store a kernel virtual address in a uint32_t.

Reviewed by: kevans

freebsd32: remove freebsd11_freebsd32_getdents

It's exactly the same as freebsd11_getdents.

Reviewed by: kevans

freebsd32: remove redundent osig*() implementations

ofreebsd32_sigprocmask, ofreebsd32_sigblock, ofreebsd32_sigsetmask,
and ofreebsd32_sigsuspend were all duplicates of the default ABI
versions and there are no type concerns as all arguments are the
same.

Reviewed by: kevans

freebsd32: remove freebsd32_recvfrom

The freebsd32_recvfrom() serves no purpose as no arguments require
translation. The prototype was mis-declared and the implementation
contained (relatively harmless) errors.

Reviewed by: kevans

freebsd32: remove redundant no-arg syscalls

pipe requires no special handling.

ofreebsd32_sigpending did differ from osigpending in that it acted
on the siglist rather than the sigqueue, but this appears to be an
oversight in 3fbdb3c21524d9d95278ada1d61b4d1e6bee654b.

ogetpagesize could theoretically have ABI-dependent results, but in
practice does not. If it does it would be easy handle in the central
implementation and be the least of the problems in changing the value of
PAGE_SIZE.

Reviewed by: kevans

freebsd32: include `__` in semctl names

This mirrors sys/kern/syscall.master and will simplify generation
of freebsd32 files.

Reviewed by: kevans

freebsd32: prototype gssd_syscall()

Nothing about the interface should prevent this from working so
go ahead and prototype it for consistency.

Reviewed by: kevans

syscalls: regen

Regen

Regen after 0dc332bff200

Regen

regen syscall files after d51198d63b63

Regenerate syscall files after reallocation of aio_writev/aio_readv

Regenerate syscall files after addition of aio_writev/aio_readv

Regen.

Regen

Regen after r366145.

Sponsored by: DARPA

Regenerate.

Sponsored by: The FreeBSD Foundation

Refactor ptrace() ABI compatibility.

Add a freebsd32_ptrace() and move as many freebsd32 shims as possible
to freebsd32_ptrace(). Aside from register sets, freebsd32 passes
pointers to native structures to kern_ptrace() and converts to/from
native/32-bit structure formats in freebsd32_ptrace() outside of
kern_ptrace().

Reviewed by: kib
Obtained from: CheriBSD
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D25195

Update the files created from the new syscalls.master from r361599.

Reviewed by: brooks
Differential Revision: https://reviews.freebsd.org/D24949

sysent: re-roll after 360236 (AUE_CLOSERANGE used)

sysent: re-roll after r359930

sysent: re-roll after introduction of close_range in r359836

make sysent for r358172 ("vfs: add realpathat syscall")

regen sysent after r357831, r357838

Capability mode changes allowing fdatasync and getloginclass.

Sponsored by: The FreeBSD Foundation

Regen.

Jail and capability mode for shm_rename; add audit support for shm_rename

Co-mingling two things here:

* Addressing some feedback from Konstantin and Kyle re: jail,
capability mode, and a few other things
* Adding audit support as promised.

The audit support change includes a partial refresh of OpenBSM from
upstream, where the change to add shm_rename has already been
accepted. Matthew doesn't plan to work on refreshing anything else to
support audit for those new event types.

Submitted by: Matthew Bryan <matthew.bryan@isilon.com>
Reviewed by: kib
Relnotes: Yes
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D22083

sysent: regenerate after r352747.

Sponsored by: Dell EMC Isilon

sysent: regenerate after r352705

This also implements it, fixes kdump, and removes no longer needed bits from
lib/libc/sys/shm_open.c for the interim.

sysent: regenerate after r352700

Add sysctlbyname system call

Previously userspace would issue one syscall to resolve the sysctl and then
another one to actually use it. Do it all in one trip.

Fallback is provided in case newer libc happens to be running on an older
kernel.

Submitted by: Pawel Biernacki
Reported by: kib, brooks
Differential Revision: https://reviews.freebsd.org/D17282

Regen.

make sysent after r347228

Regenerate to add @generated tag in generated files.

Regen after r345982.

Regenerate sysent files after having modified syscalls.master.

Regen.

Regen after r340302: Fix freebsd32 mknod(at).

Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D17928

Regen after r340294: Fix a number of bugs in freebsd32's capabilities.conf.

Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D17925

Regen after r340274: Make freebsd32_utmx_op follow the freebsd32_foo
convention.

Regen after 340272: Make __sysctl follow the freebsd32_foo convention

Sponsored by: DARPA, AFRL

Regenerate after r340195.

Regenerate after UNIMPL -> OBSOL changes in r339001.

Approved by: re (gjb)

Regen after r338357.

Approved by: re (gjb)

Regen after r337998.

Revert r337922, except for some documention-only bits. This needs to wait
until user is changed to stop using jail(2).

Differential Revision: D14791

Put jail(2) under COMPAT_FREEBSD11. It has been the "old" way of creating
jails since FreeBSD 7.

Along with the system call, put the various security.jail.allow_foo and
security.jail.foo_allowed sysctls partly under COMPAT_FREEBSD11 (or
BURN_BRIDGES). These sysctls had two disparate uses: on the system side,
they were global permissions for jails created via jail(2) which lacked
fine-grained permission controls; inside a jail, they're read-only
descriptions of what the current jail is allowed to do. The first use
is obsolete along with jail(2), but keep them for the second-read-only use.

Differential Revision: D14791

Regenerate after r336980.

Regen after r336171.

Regen after 335900.

PR: 228671

Regen after 335177 (rename sys_obreak to sys_break).

Regen after r334223: make vadvise compat freebsd11.

Move most of the contents of opt_compat.h to opt_global.h.

opt_compat.h is mentioned in nearly 180 files. In-progress network
driver compabibility improvements may add over 100 more so this is
closer to "just about everywhere" than "only some files" per the
guidance in sys/conf/options.

Keep COMPAT_LINUX32 in opt_compat.h as it is confined to a subset of
sys/compat/linux/*.c. A fake _COMPAT_LINUX option ensure opt_compat.h
is created on all architectures.

Move COMPAT_LINUXKPI to opt_dontuse.h as it is only used to control the
set of compiled files.

Reviewed by: kib, cem, jhb, jtl
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D14941

Regenerate sysent files after r331279.

Regen after r330517.

Regen after r329322.

Revert r329323. I missed something in my testing.

Regen after r329322: Fix getdirentries(2) under 32-bit compat.

Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D14379

Regenerate auto-generated files

regen freebsd32_sysent.c after r324564 (freebsd32_posix_fallocate)

Regen.

Followup to r318765 (capsicumize cpuset_*affinity)

Update *sysent files

Regen.

Regen sysent after r318634, no open(2) in capability mode

Sponsored by: The FreeBSD Foundation

Regent post r317845.

MFC after: 1 week
MFC with: r317845
Sponsored by: DARPA, AFRL

Hook up new audit event identifiers for various non-Orange Book/CAPP
system calls supported by OpenBSM 1.2-alpha5.

Obtained from: TrustedBSD Project
MFC after: 3 weeks
Sponsored by: DARPA, AFRL

Regenerate syscall files for r315526

Sponsored by: Dell EMC

Regenerate all the system call tables to drop "created from" lines.

One of the ibcs2 files contains some actual changes (new headers) as
it hasn't been regenerated after older changes to makesyscalls.sh.

Regen after r310638.

Differential Revision: https://reviews.freebsd.org/D8854

Regen.

Remove the obsolete and unused openbsd_poll system call. (Phase 2)

Reported by: brooks
Reviewed by: brooks, jhb
Differential Revision: https://reviews.freebsd.org/D7548

Regen after r304176, fdatasync(2) addition.

Regenerate system call tables for r303699 and r303700.

Generate syscall tables and update pipe() implementation after r302094.

Mark the pipe() system call as COMPAT10.

As of r302092 libc uses pipe2() with a zero flags value instead of pipe().

Approved by: re (gjb)
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D6816

Regen.

Regenerate syscalls.

Run make sysent.

Regen for r276654 (__getcwd()).

Regen for r274462.

Regenerate after r272823:
Move the SCTP syscalls to netinet with the rest of the SCTP code.

Submitted by: Steve Kiernan <stevek@juniper.net>
Reviewed by: tuexen, rrs
Obtained from: Juniper Networks, Inc.

Regen.

Regen per r263318.

Sponsored by: EMC / Isilon storage division

Regen.

Approved by: re (delphij)

Regenerate for freebsd32_cap_enter().

Approved by: re (hrs)

Regenerate after r255219.

Sponsored by: The FreeBSD Foundation

Regenerate after r254491.

Regenerate after r254481.

Regenerate after r254447.

Sponsored by: The FreeBSD Foundation

Regenerate.

Regenerate

aio_mlock() added:
- Regen for r251526.
- Bump __FreeBSD_version.

Regenerate.

Regenerate files for pipe2().

Regenerate files for accept4().

Regen.

MFC after: 1 week

Regenerate after r248599.

Sponsored by: The FreeBSD Foundation

Regen after r247667.

Regen after r247602.

Regen

regen.

Implement syscall clock_getcpuclockid2, so we can get a clock id
for process, thread or others we want to support.
Use the syscall to implement POSIX API clock_getcpuclock and
pthread_getcpuclockid.

PR: 168417

Regenerate.

Regenerate.

Regenerate system call tables.

o) Add COMPAT_FREEBSD32 support for MIPS kernels using the n64 ABI with userlands
using the o32 ABI. This mostly follows nwhitehorn's lead in implementing
COMPAT_FREEBSD32 on powerpc64.
o) Add a new type to the freebsd32 compat layer, time32_t, which is time_t in the
32-bit ABI being used. Since the MIPS port is relatively-new, even the 32-bit
ABIs use a 64-bit time_t.
o) Because time{spec,val}32 has the same size and layout as time{spec,val} on MIPS
with 32-bit compatibility, then, disable some code which assumes otherwise
wrongly when built for MIPS. A more general macro to check in this case would
seem like a good idea eventually. If someone adds support for using n32
userland with n64 kernels on MIPS, then they will have to add a variety of
flags related to each piece of the ABI that can vary. That's probably the
right time to generalize further.
o) Add MIPS to the list of architectures which use PAD64_REQUIRED in the
freebsd32 compat code. Probably this should be generalized at some point.

Reviewed by: gonzo

- Add the ffclock_getcounter(), ffclock_getestimate() and ffclock_setestimate()
system calls to provide feed-forward clock management capabilities to
userspace processes. ffclock_getcounter() returns the current value of the
kernel's feed-forward clock counter. ffclock_getestimate() returns the current
feed-forward clock parameter estimates and ffclock_setestimate() updates the
feed-forward clock parameter estimates.

- Document the syscalls in the ffclock.2 man page.

- Regenerate the script-derived syscall related files.

Committed on behalf of Julien Ridoux and Darryl Veitch from the University of
Melbourne, Australia, as part of the FreeBSD Foundation funded "Feed-Forward
Clock Synchronization Algorithms" project.

For more information, see http://www.synclab.org/radclock/

Submitted by: Julien Ridoux (jridoux at unimelb edu au)

Regenerate system call tables.

Regen.

Regen.

Wrap mprotect(2) so that we can add execute permissions when read
permissions are requested. This is needed on amd64 and ia64 for
JDK 1.4.x

Auto-generated code from sys_ prefixing makesyscalls.sh change

Approved by: re(bz)

Auto-generated system call code with cap_new(), cap_getrights().

Approved by: mentor (rwatson), re (Capsicum blanket)
Sponsored by: Google Inc

Regen.

Regen.

Regen

Regenerate.

Regen.

Regenerate.

Regenerate system call files following addition of cap_enter(2),
cap_getmode(2), and capabilities.conf.

Reviewed by: anderson
Discussed with: benl, kris, pjd
Obtained from: Capsicum Project
Sponsored by: Google, Inc.
MFC after: 3 months

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Regenerate

Regen.

Regen after MFC of COMPAT_FREEBSD32.

Regen

Regen after big endian compatibility import.

Provide groundwork for 32-bit binary compatibility on non-x86 platforms,
for upcoming 64-bit PowerPC and MIPS support. This renames the COMPAT_IA32
option to COMPAT_FREEBSD32, removes some IA32-specific code from MI parts
of the kernel and enhances the freebsd32 compatibility code to support
big-endian platforms.

Reviewed by: kib, jhb

Regen

Regenerate sysent files after r200491.

Regen

Regenerate.

Regenerate

Regenerate system call files following r197636.

Regen the freebsd32 parts.

Approved by: re (kib)

Regen.

Regen.

Regen.

Regen.

Regenerate

Regenerate generated syscall files following changes to struct sysent in
r193234.

Regen for new jail system calls in r191673.

Approved by: bz (mentor)

Regen

Regen.

Regen after jail support was added in r185435.

Regenerate system call tables for r184789.

Regen.

Regen for freebsd32_getdirentries().

- Import the HEAD csup code which is the basis for the cvsmode work.

Regen.

Regenerate for r183270.

Regenerate for r183188.

Regenerate for r183042.

Regenerate following r182123.

Update system call tables.

The previous commit also included changes to all the system call lists,
but it is a tradition to update these lists in a second commit, so rerun
make sysent to update the $FreeBSD$ tags inside these files to refer to
the latest version of syscalls.master.

Requested by: rwatson

Integrate the new MPSAFE TTY layer to the FreeBSD operating system.

The last half year I've been working on a replacement TTY layer for the
FreeBSD kernel. The new TTY layer was designed to improve the following:

- Improved driver model:

The old TTY layer has a driver model that is not abstract enough to
make it friendly to use. A good example is the output path, where the
device drivers directly access the output buffers. This means that an
in-kernel PPP implementation must always convert network buffers into
TTY buffers.

If a PPP implementation would be built on top of the new TTY layer
(still needs a hooks layer, though), it would allow the PPP
implementation to directly hand the data to the TTY driver.

- Improved hotplugging:

With the old TTY layer, it isn't entirely safe to destroy TTY's from
the system. This implementation has a two-step destructing design,
where the driver first abandons the TTY. After all threads have left
the TTY, the TTY layer calls a routine in the driver, which can be
used to free resources (unit numbers, etc).

The pts(4) driver also implements this feature, which means
posix_openpt() will now return PTY's that are created on the fly.

- Improved performance:

One of the major improvements is the per-TTY mutex, which is expected
to improve scalability when compared to the old Giant locking.
Another change is the unbuffered copying to userspace, which is both
used on TTY device nodes and PTY masters.

Upgrading should be quite straightforward. Unlike previous versions,
existing kernel configuration files do not need to be changed, except
when they reference device drivers that are listed in UPDATING.

Obtained from: //depot/projects/mpsafetty/...
Approved by: philip (ex-mentor)
Discussed: on the lists, at BSDCan, at the DevSummit
Sponsored by: Snow B.V., the Netherlands
dcons(4) fixed by: kan

Regen

Regen

Regen.

Regen.

Remove kernel support for M:N threading.

While the KSE project was quite successful in bringing threading to
FreeBSD, the M:N approach taken by the kse library was never developed
to its full potential. Backwards compatibility will be provided via
libmap.conf for dynamically linked binaries and static binaries will
be broken.

Regenerate for readlink(2).

Regenerate.

Regen for shm_open(2) and shm_unlink(2).

Regen.

Regenerate.

Approved by: re(kensmith)

Regenerate after mmap/lseek/etc syscall changes

Approved by: re (kensmith)

Regen.

Regen.

This commits the remake in kern/ make sysent to get
the correct syscalls.master's $FreeBSD$ tag record and
a make sysent in sys/compat/freebsd32. Thanks Ruslan
for pointing out the steps I missed :-0
Approved by: gnn

Regen.

Regenerate.

Regenerate.

Regenerate.

Regenerate.

Regenerate.

Regenerate.

Regenerate.

Regenerate.

Regenerate.

Regenerate.

The following functions need not to be reimplemented, reuse 64bit
syscalls instead:
sigqueue, thr_set_name, thr_setscheduler, thr_getscheduler,
thr_setschedparam.

Regenerate.

Regenerate. Looks like someone missed doing this previously as more than
just the audit event change appears in the diff.

Regen to propogate <prefix>_AUE_<mumble> changes as well as the earlier
systrace changes.

Regen for MPSAFE flag removal.

Regen.

Regen.

regen for 32bit System V shared memory

regen for 32bit sendfile

Regenerate.

Regen.

Regen.

Regenerate sysent with new abort2 system call.

Implement abort2(const char *reason, int narg, void **args);

Submitted by: "Wojciech A. Koszek" <dunstan@freebsd.czest.pl>

Regen for futimes.

Regenerate (with the correct #ifdef COMPAT_43 tests now)

regen

regen after recvmsg, recvfrom, sendmsg

regen for clock_gettime, clock_settime, clock_getres

regen

Regenerate

Regen.

Regenerate.

Approved by: re (scottl)

Rebuild generated system call definition files following the addition of
the audit event field to the syscalls.master file format.

Submitted by: wsalamon
Obtained from: TrustedBSD Project

Regen.

Add a 32bit syscall wrapper for modstat

Obtained from: Yahoo!

- rename nanosleep1 to kern_nanosleep
- Add a 32bit syscall entry for nanosleep

Reviewed by: peter
Obtained from: Yahoo!

Regenerate.

Rebuild from compat/freebsd32/syscalls.master:1.43

Reviewed by: imp, phk, njl, peter
Approved by: njl

Rebuild from FreeBSD32 syscalls.master:1.42.

Close a race between a thread exiting and the freeing of it's stack.
After some discussion the best option seems to be to signal the thread's
death from within the kernel. This requires that thr_exit() take an
argument.

Discussed with: davidxu, deischen, marcel
MFC after: 3 days

Regen

Give kldunload a -f(orce) argument.

Add a MOD_QUIESCE event for modules. This should return error (EBUSY)
of the module is in use.

MOD_UNLOAD should now only fail if it is impossible (as opposed to
inconvenient) to unload the module. Valid reasons are memory references
into the module which cannot be tracked down and eliminated.

When kldunloading, we abandon if MOD_UNLOAD fails, and if -force is
not given, MOD_QUIESCE failing will also prevent the unload.

For backwards compatibility, we treat EOPNOTSUPP from MOD_QUIESCE as
success.

Document that modules should return EOPNOTSUPP for unknown events.

Regen.

Regen

Regen for libthr thread synchronization syscalls.

Regen (FWIW)

Regen.

Regen

Regen (should be a NOP except for rcsid)

Regen

Regen

regen

Regen

Regen

Regen.

Regen

Regen

Regen

Approved by: re (amd64 blanket)

Regen.

Regen.

Regen: swapoff

Regenerate after adding syscalls.

re-regen. Sigh.

regenerate. sendfile stuff and other recently picked up stubs.

Let kse_wakeup() take a KSE mailbox pointer argument.

Reviewed by: julian

Make the following name changes to KSE related functions, etc., to better
represent their purpose and minimize namespace conflicts:

kse_fn_t -> kse_func_t
struct thread_mailbox -> struct kse_thr_mailbox
thread_interrupt() -> kse_thr_interrupt()
kse_yield() -> kse_release()
kse_new() -> kse_create()

Add missing declaration of kse_thr_interrupt() to <sys/kse.h>.
Regenerate the various generated syscall files. Minor style fixes.

Reviewed by: julian

Regenerate

Initial support for executing IA-32 binaries. This will not compile
without a few patches for the rest of the kernel to allow the image
activator to override exec_copyout_strings and setregs.

None of the syscall argument translation has been done. Possibly, this
translation layer can be shared with any platform that wants to support
running ILP32 binaries on an LP64 host (e.g. sparc32 binaries?)