undo confusion.

branches: 1.1.12; 1.1.14; 1.1.16;
New makefiles for includes, syscall gen.

Replace DIOCGPART -> DIOCGPARTINFO which returns the data needed instead of
pointers.

branches: 1.17.6; 1.17.48; 1.17.68;
Catch up with descriptor handling changes. See kern_descrip.c revision
1.173 for details.

branches: 1.16.6;
Convert all the system call entry points from:
int foo(struct lwp *l, void *v, register_t *retval)
to:
int foo(struct lwp *l, const struct foo_args *uap, register_t *retval)
Fixup compat code to not write into 'uap' and (in some cases) to actually
pass a correctly formatted 'uap' structure with the right name to the
next routine.
A few 'compat' routines that just call standard ones have been deleted.
All the 'compat' code compiles (along with the kernels required to test
build it).
98% done by automated scripts.

branches: 1.15.4; 1.15.8;
Add compat_linux and exec_linux_elf lkm support for amd64:
- Add needed COMPAT_OSSAUDIO to GENERIC.
- Add missing includes needed by linux_syscallargs.h.
- Add lkm building.

branches: 1.14.14; 1.14.16; 1.14.20;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.13.2;
Merge newlock2 to head.

__unused removal on arguments; approved by core.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

branches: 1.10.20; 1.10.22;
merge ktrace-lwp.

branches: 1.9.2; 1.9.18;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

Change 'data' argument to fo_ioctl and fo_fcntl from 'caddr_t' to 'void *'.
Avoids a lot of casting and removes the need for some line breaks.
Removed a load of (caddr_t) casts from calls to copyin/copyout as well.
(approved by christos - he has a plan to remove caddr_t...)

Merge the nathanw_sa branch.

add RCSIDs (including regeneration of files as appropriate)

branches: 1.4.2;
Fix a partial construction problem that can cause race conditions
between creation of a file descriptor and close(2) when using kernel
assisted threads. What we do is stick descriptors in the table, but
mark them as "larval". This causes essentially everything to treat
it as a non-existent descriptor, except for fdalloc(), which sees a
filled slot so that it won't (incorrectly) allocate it again. When
a descriptor is fully constructed, the code that has constructed it
marks it as "mature" (which actually clears the "larval" flag), and
things continue to work as normal.

While here, gather all the code that gets a descriptor from the table
into a fd_getfile() function, and call it, rather than having the
same (sometimes incorrect) code copied all over the place.

branches: 1.3.2; 1.3.4;
No-op commit to force update to a non-"-kk" revision.

branches: 1.2.2;
Correct copyright year.

Add some BLK* ioctl calls. Currently only the easy and useful ones
are implemented.

branches: 1.2.4;
No-op commit to force update to a non-"-kk" revision.

branches: 1.1.2;
Add some BLK* ioctl calls. Currently only the easy and useful ones
are implemented.

add support COMPAT_LINUX for aarch64

branches: 1.56.2;
Remove clause 3 and 4 from TNF licenses

branches: 1.55.6; 1.55.8; 1.55.10;
Convert all the system call entry points from:
int foo(struct lwp *l, void *v, register_t *retval)
to:
int foo(struct lwp *l, const struct foo_args *uap, register_t *retval)
Fixup compat code to not write into 'uap' and (in some cases) to actually
pass a correctly formatted 'uap' structure with the right name to the
next routine.
A few 'compat' routines that just call standard ones have been deleted.
All the 'compat' code compiles (along with the kernels required to test
build it).
98% done by automated scripts.

branches: 1.54.20; 1.54.28; 1.54.32;
Merge newlock2 to head.

__unused removal on arguments; approved by core.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

branches: 1.51.18; 1.51.48; 1.51.50;
Merge the nathanw_sa branch.

add RCSIDs (including regeneration of files as appropriate)

branches: 1.49.24; 1.49.26;
Assign my copyright to TNF. Merge with others were appropriate.
Regen syscall files after script change.

Attempt to fix the mess.

Wheeee!: 8-way split of compat/linux/linux_misc.c into common code and multi-architechture functions.

Substantial signal handling changes:
* Increase the size of sigset_t to accomodate 128 signals -- adding new
versions of sys_setprocmask(), sys_sigaction(), sys_sigpending() and
sys_sigsuspend() to handle the changed arguments.
* Abstract the guts of sys_sigaltstack(), sys_setprocmask(), sys_sigaction(),
sys_sigpending() and sys_sigsuspend() into separate functions, and call them
from all the emulations rather than hard-coding everything. (Avoids uses
the stackgap crap for these system calls.)
* Add a new flag (p_checksig) to indicate that a process may have signals
pending and userret() needs to do the full (slow) check.
* Eliminate SAS_ALTSTACK; it's exactly the inverse of SS_DISABLE.
* Correct emulation bugs with restoring SS_ONSTACK.
* Make the signal mask in the sigcontext always use the emulated mask format.
* Store signals internally in sigaction structures, rather than maintaining a
bunch of little sigsets for each SA_* bit.
* Keep track of where we put the signal trampoline, rather than figuring it out
in *_sendsig().
* Issue a warning when a non-emulated sigaction bit is observed.
* Add missing emulated signals, and a native SIGPWR (currently not used).
* Implement the `not reset when caught' semantics for relevant signals.

Note: Only code touched by the i386 port has been modified. Other ports and
emulations need to be updated.

ufs_readdir no longer checks if vp->v_type != VDIR so
the individual emulated readdirs must check.
Since netbsd and freebsd return EINVAL for the error
and I don't know what the other platforms do, return
EINVAL for them too.

Add some braces to make egcs happy.

Oops, fix typo, pointed out by Urban Boquist <boquist@cs.chalmers.se>.

Implement the shrinking and no-change bits of the Linux mremap(2) system
call, provided by Urban Boquist <boquist@cs.chalmers.se> in PR #5693.

Add a comment about how one might implement the growing bit of mremap(2).

Fix typo in utime().

Only free cookiebuf when sure that the vop actually allocated it.

Merge with Lite2 + local changes

Linux's getsid(2) does in fact return a pid, not a pointer.

Add a comment clearly describing that Linux's getsid(2) differs from
the XPG4.2 definition in that it returns the kernel virtual address
of the session structure, rather than the process group ID of the
session leader.

branches: 1.36.2;
msync -> __msync13

Fix braino in my interpretation of the eof flag to VOP_READDIR.

Emulate mremap(2) by returning ENOMEM for now. This should be sufficient for
realloc(3) and other uses. From Matthias Scheler in PR 3920.

Signal error when getting a 64 bit offset cookie that can't be stored
in 32 bits. Provide an error message to the user, and return EINVAL.
Also, pay attention to the EOF flag from VOP_READDIR. Correct a
misspell in a panic message.

Fix "missing entries" bug when reading large directories: When reading a
directory and running out of space in the dest buffer, off should point to the
current entry (which was not saved) and not to the next.
I discovered this bug using linux and SunOS emulation over NFS, but seems to
affect other emulations as well.

branches: 1.31.2;
Changes to the sudio system:
- It is now possible to handle devices that want "looping" DMA,
e.g. the SoundBlaster correctly. The WSS and SB drivers use this.
To do this several new methods were introduced in audio_hw_if.
- Different silence handling (forced by previous change).
- The audio driver can now be mmap()-ed, but due to problems in
the VM system only for writing for now.
- The OSS (Linux) audio emulation takes advantage of some of the
new features.

Add Linux nice() syscall.

sys/dir.h -> sys/dirent.h

Catch up with setre[ug]id() changes.

branches: 1.27.4;
Update list of Linux syscalls and implement the ones that are likely to be
used and doable.

- Prototyping changes
- Fix bug that gcc -Wall found in linux_sys_getpgid()

Add explicit return types.

msync, readv and writev were recently added to the Linux kernel; add them
to the emulation as well.

We don't need a private version of fork() here any more.

Use cookies for directory offset, mostly from Greg Hudson.

Prefix names of system call implementation functions with `sys_'.

Make system calls conform to a standard prototype and bring those
prototypes into scope.

Update offset elsewhere in linux_getdents(); still emulate a bug in
Linux, but avoid endless loops.

Fix some bugs & typing problems.

Emulate some syscalls that appear in Linux 1.3: a select() with normal args,
getdents() and flock().

Check for status NULL argument in wait4 and waitpid. From PR #1392
by Thomas EberHardt.

Implement the old and older uname(2) calls.

If updating the timeval would make it negative, zero it instead.

Allow bogus timevals, per Linux.

Export bsd_to_linux_sig[], and use it.

Rearrange #includes.

Linux doesn't allow select(2) to be restarted.

Use compat_util.[ch].

* Changed to use generic ELF code from kern/exec_elf.c (which was taken
from the svr4 exec code plus the linux compat mods)
* Include file change
* Add multicast sockopts (from John Brezak)

Linux select() returns the amount of time left before a timeout would have
occured in the timeval structure. Emulate this behavior. Reported by
Theo de Raadt.

* Make Linux ELF binaries work. Lots of code duplication, but it will have to do
for now.
* Add a sanity check in linux_uselib

Rename the dirent fields to match Linux. Make sure the requested buffer
is no larger than MAXBSIZE.

Emulate the return value of times() better.

Update to use timer{add,sub}().

Added a few more system calls.
More consistent alternate root file semantics throughout.

Added Linux compat code.

sys/compat/linux/common: Nix trailing whitespace, and one blank line.

No functional change intended.

branches: 1.28.10;
sys/compat: Memset zero before copyout.

Just in case of uninitialized padding which would lead to kernel
stack disclosure. If the compiler can prove the memset redundant
then it can optimize it away; otherwise better safe than sorry.

branches: 1.27.2; 1.27.80; 1.27.92;
Remove clause 3 and 4 from TNF licenses

branches: 1.26.2; 1.26.4;
Catch up with descriptor handling changes. See kern_descrip.c revision
1.173 for details.

branches: 1.25.6;
Convert all the system call entry points from:
int foo(struct lwp *l, void *v, register_t *retval)
to:
int foo(struct lwp *l, const struct foo_args *uap, register_t *retval)
Fixup compat code to not write into 'uap' and (in some cases) to actually
pass a correctly formatted 'uap' structure with the right name to the
next routine.
A few 'compat' routines that just call standard ones have been deleted.
All the 'compat' code compiles (along with the kernels required to test
build it).
98% done by automated scripts.

branches: 1.24.4; 1.24.8;
Add compat_linux and exec_linux_elf lkm support for amd64:
- Add needed COMPAT_OSSAUDIO to GENERIC.
- Add missing includes needed by linux_syscallargs.h.
- Add lkm building.

branches: 1.23.6; 1.23.8; 1.23.12;
Use the new CDIOCREADSUBCHANNEL_BUF and CDIOREADTOCENTRIES_BUF ioctls to
avoid copying into the stackgap.

branches: 1.22.2; 1.22.4;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.21.2;
Merge newlock2 to head.

branches: 1.20.6;
don't allocate a crapload of struct's on the stack. Use a couple of unions
and use malloc for them.

branches: 1.19.4; 1.19.8; 1.19.14;
merge ktrace-lwp.

branches: 1.18.4;
nuke trailing whitespace

branches: 1.17.2; 1.17.10; 1.17.12;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

Change 'data' argument to fo_ioctl and fo_fcntl from 'caddr_t' to 'void *'.
Avoids a lot of casting and removes the need for some line breaks.
Removed a load of (caddr_t) casts from calls to copyin/copyout as well.
(approved by christos - he has a plan to remove caddr_t...)

Merge the nathanw_sa branch.

gc debugging printfs.

make the stackgap_{init,alloc} functions MP friendly (i.e. pass struct proc *
in, instead of using curproc). While there add an optional size argument to
stackgap_init.

s/printf/uprintf/

add RCSIDs (including regeneration of files as appropriate)

branches: 1.9.2;
Fix a partial construction problem that can cause race conditions
between creation of a file descriptor and close(2) when using kernel
assisted threads. What we do is stick descriptors in the table, but
mark them as "larval". This causes essentially everything to treat
it as a non-existent descriptor, except for fdalloc(), which sees a
filled slot so that it won't (incorrectly) allocate it again. When
a descriptor is fully constructed, the code that has constructed it
marks it as "mature" (which actually clears the "larval" flag), and
things continue to work as normal.

While here, gather all the code that gets a descriptor from the table
into a fd_getfile() function, and call it, rather than having the
same (sometimes incorrect) code copied all over the place.

branches: 1.8.2;
Oops, remove debugging printf.

For the read subchannel ioctl, don't mix up the data and address formats,
and always set the track to 0, like Linux does.

Add some ioctls for harddisk, floppy disk and console handling.
Implement a few extra cdrom ioctl calls.
Make sure to correctly use FILE_USE and FILE_UNUSE.

branches: 1.5.6;
Emulate the Linux DVD_* ioctls(2). This gets us 90% of the way to running the
LiViD DVD player. (See forthcoming mail to current-users.)
XXX NOTE: We should do something to probe capabilities, rather than allowing
these ioctls on any device.

branches: 1.4.12; 1.4.14; 1.4.16;
Remove stray debugging printfs

Attempt to fix the mess.

Moved compat/linux/linux_cdrom to common.

PR/4794: Urban Boquist: Linux cdrom ioctls are missing

Remove clause 3 and 4 from TNF licenses

branches: 1.7.70; 1.7.72; 1.7.74;
merge ktrace-lwp.

nuke trailing whitespace

branches: 1.5.24; 1.5.32; 1.5.34;
Add some ioctls for harddisk, floppy disk and console handling.
Implement a few extra cdrom ioctl calls.
Make sure to correctly use FILE_USE and FILE_UNUSE.

branches: 1.4.6;
Emulate the Linux DVD_* ioctls(2). This gets us 90% of the way to running the
LiViD DVD player. (See forthcoming mail to current-users.)
XXX NOTE: We should do something to probe capabilities, rather than allowing
these ioctls on any device.

branches: 1.3.12; 1.3.14; 1.3.16;
Attempt to fix the mess.

Moved compat/linux/linux_cdrom to common.

PR/4794: Urban Boquist: Linux cdrom ioctls are missing

recent versions of linux (which we now claim to be) supply a BSD-style
d_type value in getdents() results, after the d_name field.
make our emulation do the same. fixes part of PR 43695.

branches: 1.11.20; 1.11.22;
Remove clause 3 and 4 from TNF licenses

branches: 1.10.70; 1.10.72; 1.10.74;
merge ktrace-lwp.

nuke trailing whitespace

branches: 1.8.10; 1.8.18; 1.8.20;
Add missing bracket arround macro argument reference.

implement getdents64; my full java tree builds now.

branches: 1.6.24; 1.6.26;
Assign my copyright to TNF. Merge with others were appropriate.
Regen syscall files after script change.

Attempt to fix the mess.

Moved from compat/linux/linux_dirent.h to common.

Prefix names of system call implementation functions with `sys_'.

Rename the dirent fields to match Linux. Make sure the requested buffer
is no larger than MAXBSIZE.

Added Linux compat code.

s/auxillary/auxiliary/ in comments.

Add a NetBSD native futex implementation, mostly written by riastradh@.
Map the COMPAT_LINUX futex calls to the native ones.

personality() now interprets its parameter as having
the base personality type in the low byte and
various flags in the upper bytes. for now just mask off
the flags to make sure the base type is one we accept.
store the current personality in the emuldata so that
we can return the expected value for PER_QUERY.

many changes for COMPAT_LINUX:
- update the linux syscall table for each platform.
- support new-style (NPTL) linux pthreads on all platforms.
clone() with CLONE_THREAD uses 1 process with many LWPs
instead of separate processes.
- move the contents of sys__lwp_setprivate() into a new
lwp_setprivate() and use that everywhere.
- update linux_release[] and linux32_release[] to "2.6.18".
- adjust placement of emul fork/exec/exit hooks as needed
and adjust other emul code to match.
- convert all struct emul definitions to use named initializers.
- change the pid allocator to allow multiple pids to refer to the same proc.
- remove a few fields from struct proc that are no longer needed.
- disable the non-functional "vdso" code in linux32/amd64,
glibc works fine without it.
- fix a race in the futex code where we could miss a wakeup after
a requeue operation.
- redo futex locking to be a little more efficient.

branches: 1.16.14; 1.16.16;
futex support fixes from FreeBSD via cube+pengo.

branches: 1.15.6;
Remove clause 3 and 4 from TNF licenses

branches: 1.14.36; 1.14.38; 1.14.40;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.13.2;
Add a new linux_emuldata_shared flag value LINUX_LES_USE_NPTL to allow
both NPTL and old linuxthreads behaviour depending on process needs.

Apply to exit_group(), getpid() and getppid() to share them between
compat linux32 (non NPTL) and compat linux (NPTL) on amd64.

ok by manu and christos

branches: 1.12.2; 1.12.6;
1) Complete Linux exit_group() emulation
Members of the thread group must die without reporting to the parent and
without going to zombie stage. We do that by reparenting to init before
catching a SIGKILL. The parent will not see the child death.

The thread group leader must report the exit status, even if it exits
because of another thread calling exit_group(). We do that by storing the
exit status in struct linux_emuldata_shared, and the exit hook has the
duty of setting struct proc's p_xstat for the thread group leader.

2) For exit/fork/exec hooks, move the NPTL specific code to separate functions
that are shared between COMPAT_LINUX and COMPAT_LINUX32

3) Fix LINUX_CLONE_PARENT_SETTID semantics

- Complete exit_group() implementation. We now maintain a list of Linux
threads in a processes and kill them properly. The code is a bit too
complicated, but I could not find a simplier way of dealing with it

- Change getpid() and getppid() semantics to match what Linux does,
and implement gettid(). In the Linux kernel, threads are implemnted
as plain old processes. A thread group is just a set of processes,
with the parent called leader. Thread ID, which are returned by gettid(),
are just the PID of the plain old processes, and getpid() returns the
PID of the thread group leader.

- Remove struct linux32_emuldata. COMPAT_LINUX32 uses a lot of COMPAT_LINUX
code, where a struct linux_emuldata is assumed. By having distinct emuldata
structure with different sizes and layouts, we caused kernel memory
corruptions.

- Fix setprioriry() and getpriority()

Thanks to Nicolas Joly for tracking down the problem and providing me the
hardware to fix them.

branches: 1.10.4; 1.10.8; 1.10.16;
merge ktrace-lwp.

Instead of ifdef'ing __amd64__ all the Linux NPTL stuff, introduce an
ifdef LINUX_NPTL.
Also implement SETTLS flag to Linux clone()

branches: 1.8.2;
Implent CLONE_PARENT_SETTID, CLONE_CHILD_CLEARTID, and CLONE_CHILD_SETTID
options to clone(). This makes fork() work on amd64.

clone() prototype has changed and the changes is probably revelant on some
other arches.

nuke trailing whitespace

branches: 1.6.4; 1.6.6;
linux processes sharing VM space (via clone() call) must also
share same 'break' value used for brk()/sbrk(), otherwise application SIGSEGVs
quickly once different threads try to adjust data segment size

this fixes linux Mozilla crashes with SuSE 9.1 libraries, and possibly
other linux applications using real threads

branches: 1.5.2; 1.5.4;
Add copyright+license.

- add a real linux_sys___sysctl because the mib numbers are different.
implement only the kernel version getting entries.
- make the signal conversion functions consistent; dest is arg 1.
- make linux_fakedev deal with block and char devices differently.
- add linux_sys_ugetrlimit, and flesh out the regular get/setrlimit so
that they work properly.
- add linux_mmap2 [untested].
- bump kernel to 2.4.18, and make the date be valentine's day :-)
- linux_sys_*stat64 family was totally busted. Fix it.

tested only on i386.

Status:
gdb, telnet, work
jdk-1.4.0 extractor works, jdk still coredumps.

christos

branches: 1.3.2;
Fixed brk() emulation. We now keep track of the processes' idea of the
break value. See http://mail-index.netbsd.org/tech-kern/2001/03/15/0000.html
for more details.

branches: 1.2.2;
comment out ps_siginfo from struct emuldata for now, add int debugreg[8]
update comment a bit

branches: 1.1.10;
At least make this compile. Add linux compat version of auxillary data eventually to be used to make the emulation work correctly.

PR standards/44921: Add errno consts for robust mutexes

Add the two missing errno.h constants: EOWNERDEAD and ENOTRECOVERABLE.
While technically they're used for robust mutexes which we do not
support at the moment, they are listed in POSIX and used by libc++.
While libc++ can be made to build without it, it just locally redefines
the values then, so we may as well define them globally.

branches: 1.15.30;
CTASSERT that native to compat errno translation tables are kept in
sync with native errno list.

Remove extra entries (linux) which resulted in bad translated values,
and add missing ones (ibcs2, osf1 and svr4) which made some out of
bounds accesses.

Cleanup compat linux errnos by adding generic errnos in a single file.
Use it for all arches except alpha and mips.
Add a few missing native to linux errno conversions.

branches: 1.13.34; 1.13.44; 1.13.50;
Remove clause 3 and 4 from TNF licenses

branches: 1.12.114; 1.12.116; 1.12.118;
add RCSIDs (including regeneration of files as appropriate)

branches: 1.11.2; 1.11.4;
Moved the fix for negative errno returned to userland on the PowerPC to a
more machine independent fashion

constify

branches: 1.9.12;
Change linux_error to native_to_linux_errno. Add some (unrelated) debugging printfs.

Moved from linux_error.c,v

Assign my copyright to TNF. Merge with others were appropriate.
Regen syscall files after script change.

Attempt to fix the mess.

Move compat/linux/linux_error.c to common.

Map ENOMSG.

update errno maps, we now have EIDRM

- added struct emul to all emulations.
- removed all setup functions.
- added copyargs() functions where needed.

Added Linux compat code.

fix various small typos, mainly in comments.

add support COMPAT_LINUX for aarch64

Do not define LINUX_EDEADLK more than once.

Cleanup compat linux errnos by adding generic errnos in a single file.
Use it for all arches except alpha and mips.
Add a few missing native to linux errno conversions.

branches: 1.13.34; 1.13.44; 1.13.50;
Remove clause 3 and 4 from TNF licenses

branches: 1.12.70; 1.12.72; 1.12.74;
merge ktrace-lwp.

First work on COMPAT_LINUX/amd64
Process startup and dynamiclinking work, but processes hang due to
Linux arch_prctl(2) not being really supported yet.

Fix a reversed errno issue for Linux binaries on mips. While we are there,
fix broken includes for alpha and m68k.

branches: 1.9.16; 1.9.18;
Include arch/arm/linux_errno.h for arm build.

branches: 1.8.2; 1.8.4;
Added Linux errno mapping for powerpc

constify

branches: 1.6.12;
Allow kdump to compile again.

Change linux_error to native_to_linux_errno. Add some (unrelated) debugging printfs.

Assign my copyright to TNF. Merge with others were appropriate.
Regen syscall files after script change.

Attempt to fix the mess.

Split compat/linux/linux_errno.h into i386 and common parts.

Added Linux compat code.

branches: 1.1.4; 1.1.6; 1.1.10;
Cleanup compat linux errnos by adding generic errnos in a single file.
Use it for all arches except alpha and mips.
Add a few missing native to linux errno conversions.

Moved to linux_errno.c,v

Assign my copyright to TNF. Merge with others were appropriate.
Regen syscall files after script change.

Attempt to fix the mess.

Move compat/linux/linux_error.c to common.

Map ENOMSG.

update errno maps, we now have EIDRM

- added struct emul to all emulations.
- removed all setup functions.
- added copyargs() functions where needed.

Added Linux compat code.

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. Provide a convenience wrapper that
puts this logic in one place witn a comment explaining why.

While here, move the Linux futex wrapper out of its own file and plop
it in linux_misc.c, which is where it lives in the linux32 module.

Add a NetBSD native futex implementation, mostly written by riastradh@.
Map the COMPAT_LINUX futex calls to the native ones.

Overhaul the way LWP IDs are allocated. Instead of each LWP having it's
own LWP ID space, LWP IDs came from the same number space as PIDs. The
lead LWP of a process gets the PID as its LID. If a multi-LWP process's
lead LWP exits, the PID persists for the process.

In addition to providing system-wide unique thread IDs, this also lets us
eliminate the per-process LWP radix tree, and some associated locks.

Remove the separate "global thread ID" map added previously; it is no longer
needed to provide this functionality.

Nudged in this direction by ad@ and chs@.

branches: 1.121.4;
PR kern/54922: 9.99.45@20200202 panic: diagnostic assertion linux ldconfig triggers vpp != NULL in exit1()->radixtree.c line 674

Create an lwp_renumber() from the code in emulexec() and use in
linux_e_proc_exec() and linux_e_proc_fork() too.

branches: 1.120.6;
Allow syscall_establish() to install new syscalls when the existing
entry-point is either sys_nomodule or sys_nosys. Update the
makesyscalls.sh script to create a const array of bits to allow
syscall_disestablish() to properly restore the original entry-point.
Update all the initializers of struct emul to initialize the pointer
to the bit array struct emul.

XXX Regen of all files created by makesyscalls.sh will come soon,
XXX followed by a kernel version bump (since struct emul is being
XXX modified).

This commit should address PR kern/45781 and also removes the need
for the work-around for that PR in file

sys/arch/usermode/modules/syscallemu/syscallemu.c

branches: 1.119.2;
Remove an element from struct emul: e_tracesig

e_tracesig used to be implemented for Darwin compat. Nowadays the Darwin
compatiblity layer is gone and there are no other users.

This functionality isn't used where it shall be used in the existing
codebase.

If we want to emulate debugging interfaces in compat layers we would need
to implement that from scratch anyway. We would need to be bug compatible
with other OSes too.

Proposed on tech-kern@.

Welcome to NetBSD 8.99.16!

Sponsored by <The NetBSD Foundation>

branches: 1.118.2;
remove struct emul's e_fault.

It used to be used by COMPAT_IRIX for the purpose of overriding
uvm_fault (only implemented in MIPS), now removed.

Ride 8.99.12 version bump.

Do not uselessly include <sys/malloc.h>.

branches: 1.116.2; 1.116.14;
Remove COMPAT_SA / KERN_SA. Welcome to 6.99.3!
Approved by core@.

branches: 1.115.2; 1.115.6;
sizeof type -> sizeof *var

many changes for COMPAT_LINUX:
- update the linux syscall table for each platform.
- support new-style (NPTL) linux pthreads on all platforms.
clone() with CLONE_THREAD uses 1 process with many LWPs
instead of separate processes.
- move the contents of sys__lwp_setprivate() into a new
lwp_setprivate() and use that everywhere.
- update linux_release[] and linux32_release[] to "2.6.18".
- adjust placement of emul fork/exec/exit hooks as needed
and adjust other emul code to match.
- convert all struct emul definitions to use named initializers.
- change the pid allocator to allow multiple pids to refer to the same proc.
- remove a few fields from struct proc that are no longer needed.
- disable the non-functional "vdso" code in linux32/amd64,
glibc works fine without it.
- fix a race in the futex code where we could miss a wakeup after
a requeue operation.
- redo futex locking to be a little more efficient.

branches: 1.113.2; 1.113.4;
Initialise struct emul members by name (it is readable now and one can search
them in the tree).

ansify function definitions

ANSIfy another 1261 function definitions.
The only ones left in sys are beyond by sed script!
(or in sys/dist or sys/external)
Mostly they have function pointer parameters.

branches: 1.110.2;
kill MALLOC and FREE macros.

Make the emulations, exec formats, coredump, NFS, and the NFS server
into modules. By and large this commit:

- shuffles header files and ifdefs
- splits code out where necessary to be modular
- adds module glue for each of the components
- adds/replaces hooks for things that can be installed at runtime

Only call release_futexes if LINUX_NPTL

branches: 1.107.2;
futex support fixes from FreeBSD via cube+pengo.

Merge wrstuden-revivesa into HEAD.

branches: 1.105.2; 1.105.6;
Remove clause 3 and 4 from TNF licenses

branches: 1.104.2;
Network protocol interrupts can now block on locks, so merge the globals
proclist_mutex and proclist_lock into a single adaptive mutex (proc_lock).
Implications:

- Inspecting process state requires thread context, so signals can no longer
be sent from a hardware interrupt handler. Signal activity must be
deferred to a soft interrupt or kthread.

- As the proc state locking is simplified, it's now safe to take exit()
and wait() out from under kernel_lock.

- The system spends less time at IPL_SCHED, and there is less lock activity.

Sprinkle locking.

branches: 1.102.2;
Under NPTL emulation, do not reparent all members of a thread group,
but only the processes that emulate threads (with LINUX_CLONE_THREAD
set).

This fix a problem for child processes that share address space with
the parent. At exit, the child will die silently, leaving the parent
waiting indefinitely for its end ...

Cleanup unneeded LINUX_NPTL ifdef/endif.

branches: 1.100.12;
ANSIfy most of the function definitions in sys/compat (but not ndis).
All by the magic of sed ...

Remove all the __P

branches: 1.98.2;
Cleanup. Remove a few linux syscalls definitions, now identical to
native ones (with stackgap and ALT_CHECK_xxx removal). No functional
changes expected.

branches: 1.97.2;
Add compat_linux and exec_linux_elf lkm support for amd64:
- Add needed COMPAT_OSSAUDIO to GENERIC.
- Add missing includes needed by linux_syscallargs.h.
- Add lkm building.

machine/{bus,cpu,intr}.h -> sys/{bus,cpu,intr}.h

branches: 1.95.6; 1.95.8; 1.95.12;
Change the way that emulations locate files within the emulation root to
avoid having to allocate space in the 'stackgap'
- which is very LWP unfriendly.
The additional code for non-emulation namei() is trivial, the reduction for
the emulations is massive.
The vnode for a processes emulation root is saved in the cwdi structure
during process exec.
If the emulation root the TRYEMULROOT flag are set, namei() will do an initial
search for absolute pathnames in the emulation root, if that fails it will
retry from the normal root.
".." at the emulation root will always go to the real root, even in the middle
of paths and when expanding symlinks.
Absolute symlinks found using absolute paths in the emulation root will be
relative to the emulation root (so /usr/lib/xxx.so -> /lib/xxx.so links
inside the emulation root don't need changing).
If the root of the emulation would be returned (for an emulation lookup), then
the real root is returned instead (matching the behaviour of emul_lookup,
but being a cheap comparison here) so that programs that scan "../.."
looking for the root dircetory don't loop forever.
The target for symbolic links is no longer mangled (it used to get the
CHECK_ALT_xxx() treatment, so could get /emul/xxx prepended).
CHECK_ALT_xxx() are no more. Most of the change is deleting them, and adding
TRYEMULROOT to the flags to NDINIT().
A lot of the emulation system call stubs could now be deleted.

branches: 1.94.2; 1.94.4;
- Make the proclist_lock a mutex. The write:read ratio is unfavourable,
and mutexes are cheaper use than RW locks.
- LOCK_ASSERT -> KASSERT in some places.
- Hold proclist_lock/kernel_lock longer in a couple of places.

Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

Introduce a new member to struct emul, e_startlwp, to be used by
sys__lwp_create. It allows using the said syscall under COMPAT_NETBSD32.

The libpthread regression tests now pass on amd64 and sparc64.

branches: 1.91.2;
Fix Linux compat on amd64.

Merge newlock2 to head.

__unused removal on arguments; approved by core.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

Coverity CID 2990: fix memory leak (from Arnaud Lacombe)

branches: 1.86.2; 1.86.4;
fix incomplete initializer

1) Complete Linux exit_group() emulation
Members of the thread group must die without reporting to the parent and
without going to zombie stage. We do that by reparenting to init before
catching a SIGKILL. The parent will not see the child death.

The thread group leader must report the exit status, even if it exits
because of another thread calling exit_group(). We do that by storing the
exit status in struct linux_emuldata_shared, and the exit hook has the
duty of setting struct proc's p_xstat for the thread group leader.

2) For exit/fork/exec hooks, move the NPTL specific code to separate functions
that are shared between COMPAT_LINUX and COMPAT_LINUX32

3) Fix LINUX_CLONE_PARENT_SETTID semantics

- Complete exit_group() implementation. We now maintain a list of Linux
threads in a processes and kill them properly. The code is a bit too
complicated, but I could not find a simplier way of dealing with it

- Change getpid() and getppid() semantics to match what Linux does,
and implement gettid(). In the Linux kernel, threads are implemnted
as plain old processes. A thread group is just a set of processes,
with the parent called leader. Thread ID, which are returned by gettid(),
are just the PID of the plain old processes, and getpid() returns the
PID of the thread group leader.

- Remove struct linux32_emuldata. COMPAT_LINUX32 uses a lot of COMPAT_LINUX
code, where a struct linux_emuldata is assumed. By having distinct emuldata
structure with different sizes and layouts, we caused kernel memory
corruptions.

- Fix setprioriry() and getpriority()

Thanks to Nicolas Joly for tracking down the problem and providing me the
hardware to fix them.

branches: 1.83.4; 1.83.8; 1.83.16;
merge ktrace-lwp.

To awake all processes sleeping on a futex, set maximum value to 0x7fffffff
instead of -1 (0xffffffff): the value is signed...

branches: 1.81.2;
Implement more of Linux futex(2)

Fix build when LINUX_NPTL is not defined

Instead of ifdef'ing __amd64__ all the Linux NPTL stuff, introduce an
ifdef LINUX_NPTL.
Also implement SETTLS flag to Linux clone()

Implement Linux futex ang gettid

branches: 1.77.2;
Implent CLONE_PARENT_SETTID, CLONE_CHILD_CLEARTID, and CLONE_CHILD_SETTID
options to clone(). This makes fork() work on amd64.

clone() prototype has changed and the changes is probably revelant on some
other arches.

Add a const.

Define linux_usertrap function, and set it in struct emul. For all
but amd64, it just returns 0, doing nothing.

For amd64, it implements vsyscalls through cheating: if the faulting
address is in the vsyscall area (which is statically known on Linux/amd64),
and the intruction pointer is too, it must have been a vsyscall. In that
case, retrieve the return address from the user stack, fix up %rip and
%rsp, and just execute the normal system call. It will return as if
the vsyscall has been executed.

s/uvm_map_defaultaddr/uvm_default_mapaddr/ HI FRANK!

Fix some things regarding COMPAT_NETBSD32 and limits/VM addresses.

* For sparc64 and amd64, define *SIZ32 VM constants.
* Add a new function pointer to struct emul, pointing at a function
that will return the default VM map address. The default function
is uvm_map_defaultaddr, which just uses the VM_DEFAULT_ADDRESS
macro. This gives emulations control over the default map address,
and allows things to be mapped at the right address (in 32bit range)
for COMPAT_NETBSD32.
* Add code to adjust the data and stack limits when a COMPAT_NETBSD32
or COMPAT_SVR4_32 binary is executed.
* Don't use USRSTACK in kern_resource.c, use p_vmspace->vm_minsaddr
instead (emulations might have set it differently)
* Since this changes struct emul, bump kernel version to 3.99.2

Tested on amd64, compile-tested on sparc64.

branches: 1.72.4; 1.72.6; 1.72.10;
fix two bugs in previous:
* flags passed from fork1() are FORK_*, not CLONE_*; thus, correct is to check
for FORK_SHAREVM, not CLONE_VM
* fix a reference counting bug

linux processes sharing VM space (via clone() call) must also
share same 'break' value used for brk()/sbrk(), otherwise application SIGSEGVs
quickly once different threads try to adjust data segment size

this fixes linux Mozilla crashes with SuSE 9.1 libraries, and possibly
other linux applications using real threads

branches: 1.70.2;
Put back Emmanuel's sigfilter hooks, as decided by Core.

Introduce lwp_emuldata and the associated hooks. No hook is provided for the
exec case, as the emulation already has the ability to intercept that
with the e_proc_exec hook. It is the responsability of the emulation to
take appropriaye action about lwp_emuldata in e_proc_exec.

Patch reviewed by Christos.

back the sigfilter emulation hook change off

Dynamic sysctl.

Gone are the old kern_sysctl(), cpu_sysctl(), hw_sysctl(),
vfs_sysctl(), etc, routines, along with sysctl_int() et al. Now all
nodes are registered with the tree, and nodes can be added (or
removed) easily, and I/O to and from the tree is handled generically.

Since the nodes are registered with the tree, the mapping from name to
number (and back again) can now be discovered, instead of having to be
hard coded. Adding new nodes to the tree is likewise much simpler --
the new infrastructure handles almost all the work for simple types,
and just about anything else can be done with a small helper function.

All existing nodes are where they were before (numerically speaking),
so all existing consumers of sysctl information should notice no
difference.

PS - I'm sorry, but there's a distinct lack of documentation at the
moment. I'm working on sysctl(3/8/9) right now, and I promise to
watch out for buses.

Add a sigfilter emulation hook. It is used at the beginning of kpsignal2()
so that a specific emulation has the oportunity to filter out some signals.

if sigfilter returns 0, then no signal is sent by kpsignal2().

There is another place where signals can be generated: trapsignal. Since this
function is already an emulation hook, no call to the sigfilter hook was
introduced in trapsignal.

This is needed to emulate the softsignal feature in COMPAT_DARWIN (signals
sent as Mach exception messages)

add support for non-executable mappings (where the hardware allows this)
and make the stack and heap non-executable by default. the changes
fall into two basic catagories:

- pmap and trap-handler changes. these are all MD:
= alpha: we already track per-page execute permission with the (software)
PG_EXEC bit, so just have the trap handler pay attention to it.
= i386: use a new GDT segment for %cs for processes that have no
executable mappings above a certain threshold (currently the
bottom of the stack). track per-page execute permission with
the last unused PTE bit.
= powerpc/ibm4xx: just use the hardware exec bit.
= powerpc/oea: we already track per-page exec bits, but the hardware only
implements non-exec mappings at the segment level. so track the
number of executable mappings in each segment and turn on the no-exec
segment bit iff the count is 0. adjust the trap handler to deal.
= sparc (sun4m): fix our use of the hardware protection bits.
fix the trap handler to recognize text faults.
= sparc64: split the existing unified TSB into data and instruction TSBs,
and only load TTEs into the appropriate TSB(s) for the permissions.
fix the trap handler to check for execute permission.
= not yet implemented: amd64, hppa, sh5

- changes in all the emulations that put a signal trampoline on the stack.
instead, we now put the trampoline into a uvm_aobj and map that into
the process separately.

originally from openbsd, adapted for netbsd by me.

branches: 1.64.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

Do the syscall_plain/syscall_fancy dance on ARM. Shaves a fair number
of cycles off the syscall overhead.

Since all COMPAT_LINUX platforms now support __HAVE_SYSCALL_INTERN,
garbage-collect the LINUX_SYSCALL_FUNCTION stuff.

Merge the nathanw_sa branch.

set struct emul's nsysent to compat SYS_NSYSENT, not SYS_MAXSYSCALL

- Introduce a e_fault field in struct proc to provide emulation specific
memory fault handler. IRIX uses irix_vm_fault, and all other emulation
use NULL, which means to use uvm_fault.

- While we are there, explicitely set to NULL the uninitialized fields in
struct emul: e_fault and e_sysctl on most ports

- e_fault is used by the trap handler, for now only on mips. In order to avoid
intrusive modifications in UVM, the function pointed by e_fault does not
has exactly the same protoype as uvm_fault:
int uvm_fault __P((struct vm_map *, vaddr_t, vm_fault_t, vm_prot_t));
int e_fault __P((struct proc *, vaddr_t, vm_fault_t, vm_prot_t));

- In IRIX share groups, all the VM space is shared, except one page.
This bounds us to have different VM spaces and synchronize modifications
to the VM space accross share group members. We need an IRIX specific hook
to the page fault handler in order to propagate VM space modifications
caused by page faults.

rename sysctl_linux() to linux_sysctl() and hook it into emul_linux

make the stackgap_{init,alloc} functions MP friendly (i.e. pass struct proc *
in, instead of using curproc). While there add an optional size argument to
stackgap_init.

Fix typo in last commit.

On platforms that don't __HAVE_SYSCALL_INTERN, define LINUX_SYSCALL_FUNCTION
to be the value of emul_linux.e_syscall that we want. This allows it to differ
between machines, so I can have a separate linux_syscall() on arm.

add RCSIDs (including regeneration of files as appropriate)

Make the setregs hook emulation-specific, rather than executable
format specific.
Struct emul has a e_setregs hook back, which points to emulation-specific
setregs function. es_setregs of struct execsw now only points to
optional executable-specific setup function (this is only used for
ECOFF).

branches: 1.52.2; 1.52.4;
Add an e_trapsignal member to struct emul, so that emulated processes can
send the appropriate signal depending on the trap type.

Removed obsoletes EMUL_NO_BSD_ASYNCIO_PIPE and EMUL_NO_SIGIO_ON_READ flags.
Async I/O OS specifities should now handled in OS specific code. Linux
has been done, but other emulation should be handled. See case LINUX_F_SETFL
in sys/compat/linux/common/linux_file.c:linux_sys_fcntl() for more details.

The data that has been collected yet:

Net Free Open Linux SunOS AIX OSF1 Darwin
send SIGIO to write end of pipe Y N N N N N Y Y
send SIGIO to read end of pipe Y Y N N N ? Y ?
send SIGIO to write end of socket Y Y Y N N Y Y Y
send SIGIO to read end of socket Y Y Y Y Y ? Y ?

Changed EMUL_BSD_ASYNCIO_PIPE to EMUL_NO_BSD_ASYNCIO_PIPE, so that
the native emulation (NetBSD) does not have a flag.

Added two flags to emulation packages:

EMUL_BSD_ASYNCIO_PIPE notes that the emulated binaries expect the original
BSD pipe behavior for asynchronous I/O, which is to fire SIGIO on read() and
write(). OSes without this flag do not expect any SIGIO to be fired on
read() and write() for pipes, even when async I/O was requested. As far as
we know, the OSes that need EMUL_BSD_ASYNCIO_PIPE are NetBSD, OSF/1 and
Darwin.

EMUL_NO_SIGIO_ON_READ notes that the emulated binaries that requested
asynchrnous I/O expect the reader process to be notified by a SIGIO, but
not the writer process. OSes without this flag expect the reader and the
writer to be notified when some data has arrived or when some data have been
read. As far as we know, the OSes that need EMUL_NO_SIGIO_ON_READ are Linux
and SunOS.

Use parent's vmspace in linux_e_proc_fork() hook, the child does not
have vmspace setup yet. This fixes lossage discussed on current-users,
thread "hard lockups with -current and Netscape", and should fix
kern/12433 by <kawamoto@tenjin.org>, maybe also kern/12455.

XXX Threads forked via linux_sys_clone() should share the brk value
XXX if they share vmspace. This needs to be implemented.

do not dereference p_vmspace, if it is not initialized yet (NULL).

Fixed brk() emulation. We now keep track of the processes' idea of the
break value. See http://mail-index.netbsd.org/tech-kern/2001/03/15/0000.html
for more details.

branches: 1.45.2;
Added support for powerpc Linux compatibility

Introduce 2 new flags in types.h:
* __HAVE_SYSCALL_INTERN. If this is defined, e_syscall is replaced by
e_syscall_intern, which is called at key places in the kernel. This can be
used to set a MD syscall handler pointer. This obsoletes and replaces the
*_HAS_SEPARATED_SYSCALL flags.
* __HAVE_MINIMAL_EMUL. If this is defined, certain (deprecated) elements in
struct emul are omitted.

always fill in e_syscall in respective emul_*; if the emulation doesn't
have it's own separated *_syscall() function, use syscall()

if machdep define LINUX_MACHDEP_HAS_SEPARATED_SYSCALL is defined, put
linux_syscall() to emul_linux
define LINUX_MACHDEP_HAS_SEPARATED_SYSCALL for i386

if LINUX_MACHDEP_PASS_PPID_AND_EUID is defined for given arch, add
flags EMUL_GETPID_PASS_PPID|EMUL_GETID_PASS_EID to emul_linux
define this option for alpha

add e_path (emulation path) to struct emul, which replaces emulation-specific
*_emul_path variables

change macros CHECK_ALT_{CREAT|EXIST} to use that, 'root' doesn't need
to be passed explicitly any more and *_CHECK_ALT_{CREAT|EXIST} are removed
change explicit emul_find() calls in probe functions to get the emulation
path from the checked exec switch entry's emulation

remove no longer needed header files

add e_flags and e_syscall to struct emul; these are unsed and empty for now

(de)allocate linux emuldata on fork/exec/exit as needed

restructure struct emul and execsw, in preparation to make emulations LKMable:
* move all exec-type specific information from struct emul to execsw[] and
provide single struct emul per emulation
* elf:
- kern/exec_elf32.c:probe_funcs[] is gone, execsw[] how has one entry
per emulation and contains pointer to respective probe function
- interp is allocated via MALLOC() rather than on stack
- elf_args structure is allocated via MALLOC() rather than malloc()
* ecoff: the per-emulation hooks moved from alpha and mips specific code
to OSF1 and Ultrix compat code as appropriate, execsw[] has one entry per
emulation supporting ecoff with appropriate probe function
* the makecmds/probe functions don't set emulation, pointer to emulation is
part of appropriate execsw[] entry
* constify couple of structures

remove include of <vm/vm.h>

remove redundant vm includes.

branches: 1.35.8;
const poisoning.

The siginfo include line is not needed here anymore.

Assign my copyright to TNF. Merge with others were appropriate.
Regen syscall files after script change.

Attempt to fix the mess.

Split compat/linux/linux_exec.c into common, elf and a.out parts.

Substantial signal handling changes:
* Increase the size of sigset_t to accomodate 128 signals -- adding new
versions of sys_setprocmask(), sys_sigaction(), sys_sigpending() and
sys_sigsuspend() to handle the changed arguments.
* Abstract the guts of sys_sigaltstack(), sys_setprocmask(), sys_sigaction(),
sys_sigpending() and sys_sigsuspend() into separate functions, and call them
from all the emulations rather than hard-coding everything. (Avoids uses
the stackgap crap for these system calls.)
* Add a new flag (p_checksig) to indicate that a process may have signals
pending and userret() needs to do the full (slow) check.
* Eliminate SAS_ALTSTACK; it's exactly the inverse of SS_DISABLE.
* Correct emulation bugs with restoring SS_ONSTACK.
* Make the signal mask in the sigcontext always use the emulated mask format.
* Store signals internally in sigaction structures, rather than maintaining a
bunch of little sigsets for each SA_* bit.
* Keep track of where we put the signal trampoline, rather than figuring it out
in *_sendsig().
* Issue a warning when a non-emulated sigaction bit is observed.
* Add missing emulated signals, and a native SIGPWR (currently not used).
* Implement the `not reset when caught' semantics for relevant signals.

Note: Only code touched by the i386 port has been modified. Other ports and
emulations need to be updated.

Assign copyright to TNF.

bzero->memset, bcopy->memcpy, bcmp->memcmp

Change the "aresid" argument of vn_rdwr() from an int * to a size_t *,
to match the new uio_resid type.

Use linux_setregs().

branches: 1.25.14;
catch up with Jason's exec.h inclusion.

printf -> kprintf, sprintf -> ksprintf

include <sys/exec.h> rather than <machine/exec.h>

update to compile; needs new enum name 'Elf_sht_progbits'

kill (re)definitions of EXEC_ELF32. They're no longer necessary
(because of the EXEC_* option changes), and now cause warnings.

Fix a section header check that didn't get updated with the elf32/elf64
changes. Make this compile again with the new EXEC_* options.

Elf32_sht_progbits -> Elf_sht_progbits

slightly clean up some of the changes made when ELF64 support went in

adapt ELF-using compat code to use new ELF definitions/code. At this point,
these are restricted to 32-bit ELF, and should be severely cleaned.

Define execv() and execve() consistently across emulations.
Do path name translation.

Simplify and add comments.

- Pass the Elf32_Ehdr in the linux probe function, and use it!

Since linux binaries are (mostly) always compiled with gcc, look for
the gcc signature in the .comment section header: "\0 GCC: (GNU) ".
I've changed the probe order in kern/exec_elf.c to probe for linux ELF
binaries first and fall back to SVR4 binaries. This makes statically
linked binaries work for both linux and svr4. Note that gcc-compiled
svr4 binaries, still contain the operating system signature first and
then the GCC signature, so there is no conflict. Yes this is a hack.

branches: 1.13.4;
Prototyping changes.

Prefix names of system call implementation functions with `sys_'.

Make system calls conform to a standard prototype and bring those
prototypes into scope.

Rearrange #includes.

Use compat_util.[ch].

* Changed to use generic ELF code from kern/exec_elf.c (which was taken
from the svr4 exec code plus the linux compat mods)
* Include file change
* Add multicast sockopts (from John Brezak)

Don't forget to acknowledge that all the ELF stuff was taken from
Christos' svr4 code.

* Make Linux ELF binaries work. Lots of code duplication, but it will have to do
for now.
* Add a sanity check in linux_uselib

Generate the new ps_strings format.

- added struct emul to all emulations.
- removed all setup functions.
- added copyargs() functions where needed.

Handle Linux signal tramp code differently. Some changes because of the
now seperate Linux signal trampoline code. Add linux_sigreturn to
syscalls.master.

Added a few more system calls.
More consistent alternate root file semantics throughout.

Added Linux compat code.

- LINUX_GO_RT0_SIGNATURE for compat_linux is no longer enabled by default.
it is now defined in each arch same as the other *_SIGNATURE definitions.
- add new LINUX32_GO_RT0_SIGNATURE for compat_linux32, and is defined in amd64 and aarch64.

add support COMPAT_LINUX for aarch64

- Cleanup for dynamic sysctl:
- Remove unused *_NAMES macros for sysctl.
- Remove unused *_MAXID for sysctls.
- Move CTL_MACHDEP sysctl definitions for m68k into m68k/include/cpu.h and
use them on all m68k machines.

branches: 1.52.12; 1.52.14;
es_arglen is now in units of bytes, update the emulations accordingly.

branches: 1.51.6; 1.51.10; 1.51.14;
Increase LINUX32_ELF_AUX_ENTRIES to avoid overrun in linux32/. Also,
add comments and KASSERTs to make sure people don't forget to increase
XX_AUX_ENTRIES's when adding vectors.

Reported by martin@ (CV), with suggestions from chs@.

ok martin@ chs@

account for the 16 bytes of AT_RANDOM data in the stack setup. fixes PR 48518.
use cprng_strong32() instead of random(). add AT_RANDOM support for linux32.

implement AT_RANDOM.

branches: 1.48.8; 1.48.18; 1.48.22;
many changes for COMPAT_LINUX:
- update the linux syscall table for each platform.
- support new-style (NPTL) linux pthreads on all platforms.
clone() with CLONE_THREAD uses 1 process with many LWPs
instead of separate processes.
- move the contents of sys__lwp_setprivate() into a new
lwp_setprivate() and use that everywhere.
- update linux_release[] and linux32_release[] to "2.6.18".
- adjust placement of emul fork/exec/exit hooks as needed
and adjust other emul code to match.
- convert all struct emul definitions to use named initializers.
- change the pid allocator to allow multiple pids to refer to the same proc.
- remove a few fields from struct proc that are no longer needed.
- disable the non-functional "vdso" code in linux32/amd64,
glibc works fine without it.
- fix a race in the futex code where we could miss a wakeup after
a requeue operation.
- redo futex locking to be a little more efficient.

branches: 1.47.2; 1.47.4;
Change u_long to vaddr_t/vsize_t in exec code where appropriate (mostly
involves setregs and vmcmds). Should result in no code differences.

Include <sys/exec_aout.h> explicitly instead of relying on <sys/exec.h> to
do it for you.

Make the emulations, exec formats, coredump, NFS, and the NFS server
into modules. By and large this commit:

- shuffles header files and ifdefs
- splits code out where necessary to be modular
- adds module glue for each of the components
- adds/replaces hooks for things that can be installed at runtime

branches: 1.44.2;
Add preliminary tls support for i386. Does not work yet. From FreeBSD.

branches: 1.43.6;
Remove clause 3 and 4 from TNF licenses

branches: 1.42.12; 1.42.14; 1.42.16;
Remove all the __P

branches: 1.41.18; 1.41.20; 1.41.26; 1.41.28;
Fix Linux compat on amd64.

Merge newlock2 to head.

branches: 1.39.2;
1) Complete Linux exit_group() emulation
Members of the thread group must die without reporting to the parent and
without going to zombie stage. We do that by reparenting to init before
catching a SIGKILL. The parent will not see the child death.

The thread group leader must report the exit status, even if it exits
because of another thread calling exit_group(). We do that by storing the
exit status in struct linux_emuldata_shared, and the exit hook has the
duty of setting struct proc's p_xstat for the thread group leader.

2) For exit/fork/exec hooks, move the NPTL specific code to separate functions
that are shared between COMPAT_LINUX and COMPAT_LINUX32

3) Fix LINUX_CLONE_PARENT_SETTID semantics

Add a new signature test for linux probe function. We look for a .debuglink
section, which is specific to the Linux dynamic interpeter (yes, Linux
can execute it as a stand alone program)

branches: 1.37.2;
Add initial (but unfinished) COMPAT_LINUX32 for amd64. This is good enough so
that the i386 license manager part of amd64 version of Fluent works.

While I'm here, add SysV IPC to COMPAT_LINUX/amd64

branches: 1.36.2; 1.36.4; 1.36.6;
merge ktrace-lwp.

branches: 1.35.2;
Define linux_usertrap function, and set it in struct emul. For all
but amd64, it just returns 0, doing nothing.

For amd64, it implements vsyscalls through cheating: if the faulting
address is in the vsyscall area (which is statically known on Linux/amd64),
and the intruction pointer is too, it must have been a vsyscall. In that
case, retrieve the return address from the user stack, fix up %rip and
%rsp, and just execute the normal system call. It will return as if
the vsyscall has been executed.

First work on COMPAT_LINUX/amd64
Process startup and dynamiclinking work, but processes hang due to
Linux arch_prctl(2) not being really supported yet.

nuke trailing whitespace

branches: 1.32.8; 1.32.10;
all ports define __HAVE_SIGINFO now, so remove the CPP conditionals

constify sendsig/trapsignal

SA_SIGINFO changes

branches: 1.29.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

Use PAGE_SIZE rather than NBPG.

Merge the nathanw_sa branch.

back previous off; port can only supply LINUX_ELF_AUX_ENTRIES if it also
overrides the ELF copyargs function

Fix LINUX_ELF_AUX_ENTRIES sociability issue with Mips based ports

add generic linux compat ELF copyargs function

this gives:
* linux sysconf(_SC_CLK_TCK) gives correct value for linux binaries (hz)
even if hz != 100
* glibc gets proper information on real/effective uid and enables
secure mode for suid binaries

g/c LINUX_COPYARGS_FUNCTION, replaced by linux ELF copyargs function
g/c alpha-specific linux ELF copyargs function and linux ELF defines

Implement passing AT_{E,R}{U,G}ID in the elf aux vector, like solaris.
- pass struct proc to copyargs.
- eliminate svr4_copyargs, since it is the same as ours now.

branches: 1.21.2;
rename sysctl_linux() to linux_sysctl() and hook it into emul_linux

Don't bitch if we don't have support for a particular arch. This makes it
easier to include this header from userland binaries [sysctl] on archs that
don't support compat-linux without incurring ifdef hell.

emulation specific sysctls. Also change the kernel date to nov 11 as requested
by bad.

Crude first cut at ARMLinux binary compatibility. Successfully runs
"/emul/linux/bin/echo hello, world", dynamically linked.

Enable Mips Linux emulation in header files

branches: 1.16.2;
Adjust to the new copyargs() footprint.

branches: 1.15.2;
Add an e_trapsignal member to struct emul, so that emulated processes can
send the appropriate signal depending on the trap type.

branches: 1.14.2;
Added Linux compatibility support for powerpc ports

restructure struct emul and execsw, in preparation to make emulations LKMable:
* move all exec-type specific information from struct emul to execsw[] and
provide single struct emul per emulation
* elf:
- kern/exec_elf32.c:probe_funcs[] is gone, execsw[] how has one entry
per emulation and contains pointer to respective probe function
- interp is allocated via MALLOC() rather than on stack
- elf_args structure is allocated via MALLOC() rather than malloc()
* ecoff: the per-emulation hooks moved from alpha and mips specific code
to OSF1 and Ultrix compat code as appropriate, execsw[] has one entry per
emulation supporting ecoff with appropriate probe function
* the makecmds/probe functions don't set emulation, pointer to emulation is
part of appropriate execsw[] entry
* constify couple of structures

branches: 1.12.8;
Added linux compat support on m68k ports.

Assign my copyright to TNF. Merge with others were appropriate.
Regen syscall files after script change.

Attempt to fix the mess.

Move compat/linux/linux_exec.h to common.

Prototype new functions.

branches: 1.7.14;
adapt ELF-using compat code to use new ELF definitions/code. At this point,
these are restricted to 32-bit ELF, and should be severely cleaned.

- Pass the Elf32_Ehdr in the linux probe function, and use it!

Since linux binaries are (mostly) always compiled with gcc, look for
the gcc signature in the .comment section header: "\0 GCC: (GNU) ".
I've changed the probe order in kern/exec_elf.c to probe for linux ELF
binaries first and fall back to SVR4 binaries. This makes statically
linked binaries work for both linux and svr4. Note that gcc-compiled
svr4 binaries, still contain the operating system signature first and
then the GCC signature, so there is no conflict. Yes this is a hack.

Prefix names of system call implementation functions with `sys_'.

* Changed to use generic ELF code from kern/exec_elf.c (which was taken
from the svr4 exec code plus the linux compat mods)
* Include file change
* Add multicast sockopts (from John Brezak)

* Make Linux ELF binaries work. Lots of code duplication, but it will have to do
for now.
* Add a sanity check in linux_uselib

Handle Linux signal tramp code differently. Some changes because of the
now seperate Linux signal trampoline code. Add linux_sigreturn to
syscalls.master.

Added Linux compat code.

Make sure we have space for the aout header.

branches: 1.67.2;
Do not uselessly include <sys/malloc.h>.

branches: 1.66.22; 1.66.38;
Include <sys/exec_aout.h> explicitly instead of relying on <sys/exec.h> to
do it for you.

branches: 1.65.2;
Remove clause 3 and 4 from TNF licenses

branches: 1.64.12; 1.64.14; 1.64.16;
ANSIfy most of the function definitions in sys/compat (but not ndis).
All by the magic of sed ...

Remove all the __P

branches: 1.62.2; 1.62.4;
machine/{bus,cpu,intr}.h -> sys/{bus,cpu,intr}.h

branches: 1.61.6; 1.61.18; 1.61.20; 1.61.24;
Merge newlock2 to head.

__unused removal on arguments; approved by core.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

branches: 1.58.20; 1.58.22;
merge ktrace-lwp.

branches: 1.57.4;
nuke trailing whitespace

Don't try to map a 0 size bss.

branches: 1.55.8; 1.55.10;
- GC all the setup_stack functions
- add one for linux/i386

branches: 1.54.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

Use PAGE_SIZE rather than NBPG.

Merge the nathanw_sa branch.

count executable image pages as executable for vm-usage purposes.
also, always do the VTEXT vs. v_writecount mutual exclusion
(which we previously skipped if the text or data segment was empty).

remove trailing \n in panic(). approved perry.

Implement passing AT_{E,R}{U,G}ID in the elf aux vector, like solaris.
- pass struct proc to copyargs.
- eliminate svr4_copyargs, since it is the same as ours now.

branches: 1.47.8; 1.47.10;
add RCSIDs (including regeneration of files as appropriate)

- Add a new vnode flag VEXECMAP, which indicates that a vnode has
executable mappings. Stop overloading VTEXT for this purpose (VTEXT
also has another meaning).
- Rename vn_marktext() to vn_markexec(), and use it when executable
mappings of a vnode are established.
- In places where we want to set VTEXT, set it in v_flag directly, rather
than making a function call to do this (it no longer makes sense to
use a function call, since we no longer overload VTEXT with VEXECMAP's
meaning).

VEXECMAP suggested by Chuq Silvers.

branches: 1.45.4;
Adjust to the new copyargs() footprint.

branches: 1.44.2; 1.44.4;
put linux_sys_uselib() to separate file linux_uselib.c

add e_path (emulation path) to struct emul, which replaces emulation-specific
*_emul_path variables

change macros CHECK_ALT_{CREAT|EXIST} to use that, 'root' doesn't need
to be passed explicitly any more and *_CHECK_ALT_{CREAT|EXIST} are removed
change explicit emul_find() calls in probe functions to get the emulation
path from the checked exec switch entry's emulation

remove no longer needed header files

add e_flags and e_syscall to struct emul; these are unsed and empty for now

restructure struct emul and execsw, in preparation to make emulations LKMable:
* move all exec-type specific information from struct emul to execsw[] and
provide single struct emul per emulation
* elf:
- kern/exec_elf32.c:probe_funcs[] is gone, execsw[] how has one entry
per emulation and contains pointer to respective probe function
- interp is allocated via MALLOC() rather than on stack
- elf_args structure is allocated via MALLOC() rather than malloc()
* ecoff: the per-emulation hooks moved from alpha and mips specific code
to OSF1 and Ultrix compat code as appropriate, execsw[] has one entry per
emulation supporting ecoff with appropriate probe function
* the makecmds/probe functions don't set emulation, pointer to emulation is
part of appropriate execsw[] entry
* constify couple of structures

change the type of *syscallnames[] array to 'const char * const foo[]'

remove include of <vm/vm.h>

remove redundant vm includes.

add a new function vn_marktext() for exec code to let others know
that the vnode is now being used as process text.

branches: 1.37.4; 1.37.8;
const poisoning.

Include linux_errno.h to fix the recent error->errno losage.

Change linux_error to native_to_linux_errno. Add some (unrelated) debugging printfs.

The siginfo include line is not needed here anymore.

Assign my copyright to TNF. Merge with others were appropriate.
Regen syscall files after script change.

Attempt to fix the mess.

Split compat/linux/linux_exec.c into common, elf and a.out parts.

Substantial signal handling changes:
* Increase the size of sigset_t to accomodate 128 signals -- adding new
versions of sys_setprocmask(), sys_sigaction(), sys_sigpending() and
sys_sigsuspend() to handle the changed arguments.
* Abstract the guts of sys_sigaltstack(), sys_setprocmask(), sys_sigaction(),
sys_sigpending() and sys_sigsuspend() into separate functions, and call them
from all the emulations rather than hard-coding everything. (Avoids uses
the stackgap crap for these system calls.)
* Add a new flag (p_checksig) to indicate that a process may have signals
pending and userret() needs to do the full (slow) check.
* Eliminate SAS_ALTSTACK; it's exactly the inverse of SS_DISABLE.
* Correct emulation bugs with restoring SS_ONSTACK.
* Make the signal mask in the sigcontext always use the emulated mask format.
* Store signals internally in sigaction structures, rather than maintaining a
bunch of little sigsets for each SA_* bit.
* Keep track of where we put the signal trampoline, rather than figuring it out
in *_sendsig().
* Issue a warning when a non-emulated sigaction bit is observed.
* Add missing emulated signals, and a native SIGPWR (currently not used).
* Implement the `not reset when caught' semantics for relevant signals.

Note: Only code touched by the i386 port has been modified. Other ports and
emulations need to be updated.

Assign copyright to TNF.

bzero->memset, bcopy->memcpy, bcmp->memcmp

Change the "aresid" argument of vn_rdwr() from an int * to a size_t *,
to match the new uio_resid type.

Use linux_setregs().

branches: 1.25.14;
catch up with Jason's exec.h inclusion.

printf -> kprintf, sprintf -> ksprintf

include <sys/exec.h> rather than <machine/exec.h>

update to compile; needs new enum name 'Elf_sht_progbits'

kill (re)definitions of EXEC_ELF32. They're no longer necessary
(because of the EXEC_* option changes), and now cause warnings.

Fix a section header check that didn't get updated with the elf32/elf64
changes. Make this compile again with the new EXEC_* options.

Elf32_sht_progbits -> Elf_sht_progbits

slightly clean up some of the changes made when ELF64 support went in

adapt ELF-using compat code to use new ELF definitions/code. At this point,
these are restricted to 32-bit ELF, and should be severely cleaned.

Define execv() and execve() consistently across emulations.
Do path name translation.

Simplify and add comments.

- Pass the Elf32_Ehdr in the linux probe function, and use it!

Since linux binaries are (mostly) always compiled with gcc, look for
the gcc signature in the .comment section header: "\0 GCC: (GNU) ".
I've changed the probe order in kern/exec_elf.c to probe for linux ELF
binaries first and fall back to SVR4 binaries. This makes statically
linked binaries work for both linux and svr4. Note that gcc-compiled
svr4 binaries, still contain the operating system signature first and
then the GCC signature, so there is no conflict. Yes this is a hack.

branches: 1.13.4;
Prototyping changes.

Prefix names of system call implementation functions with `sys_'.

Make system calls conform to a standard prototype and bring those
prototypes into scope.

Rearrange #includes.

Use compat_util.[ch].

* Changed to use generic ELF code from kern/exec_elf.c (which was taken
from the svr4 exec code plus the linux compat mods)
* Include file change
* Add multicast sockopts (from John Brezak)

Don't forget to acknowledge that all the ELF stuff was taken from
Christos' svr4 code.

* Make Linux ELF binaries work. Lots of code duplication, but it will have to do
for now.
* Add a sanity check in linux_uselib

Generate the new ps_strings format.

- added struct emul to all emulations.
- removed all setup functions.
- added copyargs() functions where needed.

Handle Linux signal tramp code differently. Some changes because of the
now seperate Linux signal trampoline code. Add linux_sigreturn to
syscalls.master.

Added a few more system calls.
More consistent alternate root file semantics throughout.

Added Linux compat code.

The internal architecture name of golang is "arm" or "arm64", which has
different naming conventions from netbsd's machine[] or machine_arch[]
("earmv7", "aarch64", etc.) and cannot be used as is.
Instead, use define LINUX_GO_RT0_SIGNATURE_ARCH{32,64}.

- LINUX_GO_RT0_SIGNATURE for compat_linux is no longer enabled by default.
it is now defined in each arch same as the other *_SIGNATURE definitions.
- add new LINUX32_GO_RT0_SIGNATURE for compat_linux32, and is defined in amd64 and aarch64.

Tidy up the vnode locking around execve() on ELF images to acquire and
release the locks fewer times. Proposed on tech-kern a very long time go.

branches: 1.99.6;
Rename the MODULE_*_HOOK() macros to MODULE_HOOK_*() as briefly
discussed on irc.

NFCI intended.

Ride the earlier kernel bump - it;s getting crowded.

Merge the [pgoyette-compat] branch

- fix constants and explain limit
- use machine32 instead of hard-coded x86 stuff

Fix compile error.

Enable executing linux go binaries by using a special probe function for them.

branches: 1.94.12; 1.94.14;
Use ELFOSABI_LINUX instead of a magic number.

branches: 1.93.2; 1.93.4;
Force *stackp to (uintptr_t) before possibly moving to a smaller pointer size.

Zero-fill the ELF auxiliary vectors. Otherwise, on 64bit systems, the
padding between a_v and a_type contains kernel garbage, therefore
exposed to userland.

Original report by uebayasi@

branches: 1.91.2; 1.91.4;
A specially-crafted binary could easily control a kernel array index.
Add some checks to ensure that nothing will be read outside the allocated
area. Rewrite the code so that we don't need to allocate the whole section.

Spotted by several developers, patch from chs@/enami@

branches: 1.90.2;
Fix wrong KASSERTs. Do not compare size vs. entries count.

Increase LINUX32_ELF_AUX_ENTRIES to avoid overrun in linux32/. Also,
add comments and KASSERTs to make sure people don't forget to increase
XX_AUX_ENTRIES's when adding vectors.

Reported by martin@ (CV), with suggestions from chs@.

ok martin@ chs@

account for the 16 bytes of AT_RANDOM data in the stack setup. fixes PR 48518.
use cprng_strong32() instead of random(). add AT_RANDOM support for linux32.

implement AT_RANDOM.

branches: 1.86.2; 1.86.6; 1.86.8; 1.86.10; 1.86.16;
Change old-style function defintions to C89 prototypes.

Approved by releng.

Add a hook for freeing an ep_emul_arg. Add a wrapper routine
(exec_free_emul_arg) to call the hook and then clear the ep_emul_arg
and ep_emul_arg_free members in the exec_package.
Change users/accessors to use these routines.
Approved by releng.

branches: 1.84.8; 1.84.12;
always supply an auxiliary vector for linux ELF processes.
static executables (such as newer versions of /sbin/ldconfig)
require this to work properly. since static executables
also don't have a PT_PHDR entry, use the same heuristic as
linux does to provide a value for AT_PHDR in this case.

branches: 1.83.2; 1.83.4;
ansify function definitions

branches: 1.82.4;
PR port-amd64/39964 modules/compat_linux: missing symbols on amd64

branches: 1.81.2; 1.81.6; 1.81.8; 1.81.10; 1.81.16; 1.81.20;
Remove clause 3 and 4 from TNF licenses

branches: 1.80.16; 1.80.18; 1.80.20;
machine/{bus,cpu,intr}.h -> sys/{bus,cpu,intr}.h

branches: 1.79.6; 1.79.8; 1.79.12;
Change the way that emulations locate files within the emulation root to
avoid having to allocate space in the 'stackgap'
- which is very LWP unfriendly.
The additional code for non-emulation namei() is trivial, the reduction for
the emulations is massive.
The vnode for a processes emulation root is saved in the cwdi structure
during process exec.
If the emulation root the TRYEMULROOT flag are set, namei() will do an initial
search for absolute pathnames in the emulation root, if that fails it will
retry from the normal root.
".." at the emulation root will always go to the real root, even in the middle
of paths and when expanding symlinks.
Absolute symlinks found using absolute paths in the emulation root will be
relative to the emulation root (so /usr/lib/xxx.so -> /lib/xxx.so links
inside the emulation root don't need changing).
If the root of the emulation would be returned (for an emulation lookup), then
the real root is returned instead (matching the behaviour of emul_lookup,
but being a cheap comparison here) so that programs that scan "../.."
looking for the root dircetory don't loop forever.
The target for symbolic links is no longer mangled (it used to get the
CHECK_ALT_xxx() treatment, so could get /emul/xxx prepended).
CHECK_ALT_xxx() are no more. Most of the change is deleting them, and adding
TRYEMULROOT to the flags to NDINIT().
A lot of the emulation system call stubs could now be deleted.

branches: 1.78.2; 1.78.4;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.77.2;
Merge newlock2 to head.

__unused removal on arguments; approved by core.

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

branches: 1.74.4; 1.74.6;
Add a new signature test for linux probe function. We look for a .debuglink
section, which is specific to the Linux dynamic interpeter (yes, Linux
can execute it as a stand alone program)

Use the LWP cached credentials where sane.

integrate kauth.

branches: 1.71.2; 1.71.4; 1.71.6;
Add initial (but unfinished) COMPAT_LINUX32 for amd64. This is good enough so
that the i386 license manager part of amd64 version of Fluent works.

While I'm here, add SysV IPC to COMPAT_LINUX/amd64

branches: 1.70.2; 1.70.4; 1.70.6;
merge ktrace-lwp.

branches: 1.69.2;
- sprinkle const.
- add XXXUNCONST to the emul_find() pbuf argument free'ing. XXX: this needs
an api change.
- avoid variable shadowing.

First work on COMPAT_LINUX/amd64
Process startup and dynamiclinking work, but processes hang due to
Linux arch_prctl(2) not being really supported yet.

nuke trailing whitespace

branches: 1.66.8; 1.66.10;
adapt for changes to kern/exec_elf32.c

uninitialized variables

branches: 1.64.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

'struct proc *' -> 'struct lwp *' as required to get GENERIC for macppc built

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records. The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

Merge the nathanw_sa branch.

branches: 1.60.2;
Get the dynamic interpreter location using emul_find_interp(), so that
it checks both the alternative/emul tree, and the non-emul tree.
This makes it possible to run chrooted emulated binaries without need
to setup shadow /emul tree within the chroot hierarchy.
Only tested for COMPAT_LINUX, changes to other compat modules were
mechanical.
Fixes kern/19161 by Christian Groessler.

add generic linux compat ELF copyargs function

this gives:
* linux sysconf(_SC_CLK_TCK) gives correct value for linux binaries (hz)
even if hz != 100
* glibc gets proper information on real/effective uid and enables
secure mode for suid binaries

g/c LINUX_COPYARGS_FUNCTION, replaced by linux ELF copyargs function
g/c alpha-specific linux ELF copyargs function and linux ELF defines

remove XXX should die comment from the define; otherwise traditional cpp
screws up the elf name formation.

check out EI_OSABI and EI_ABIVERSION for linux signatures. This is what
http://upx.sourceforge.net/ binaries are like.

gc debugging printfs.

s/printf/uprintf/

add RCSIDs (including regeneration of files as appropriate)

Changed the way signature tests are done. This makes possible to run
ld.so as an executable on the PowerPC (Linux's ldd does this), and it also
much clearer IMHO.

rename elf32_read_from to exec_read_from since it is used in many places
now.

branches: 1.51.2; 1.51.4;
Added a linux_atexit_signature to match Linux statically linked ELF binaries. It
searches for a __libc_atexit ELF section, which is specific to Linux

Tighten up the ELF signature checks, and actually look for the ABI tag added
in newer glibc versions.

add e_path (emulation path) to struct emul, which replaces emulation-specific
*_emul_path variables

change macros CHECK_ALT_{CREAT|EXIST} to use that, 'root' doesn't need
to be passed explicitly any more and *_CHECK_ALT_{CREAT|EXIST} are removed
change explicit emul_find() calls in probe functions to get the emulation
path from the checked exec switch entry's emulation

remove no longer needed header files

add e_flags and e_syscall to struct emul; these are unsed and empty for now

restructure struct emul and execsw, in preparation to make emulations LKMable:
* move all exec-type specific information from struct emul to execsw[] and
provide single struct emul per emulation
* elf:
- kern/exec_elf32.c:probe_funcs[] is gone, execsw[] how has one entry
per emulation and contains pointer to respective probe function
- interp is allocated via MALLOC() rather than on stack
- elf_args structure is allocated via MALLOC() rather than malloc()
* ecoff: the per-emulation hooks moved from alpha and mips specific code
to OSF1 and Ultrix compat code as appropriate, execsw[] has one entry per
emulation supporting ecoff with appropriate probe function
* the makecmds/probe functions don't set emulation, pointer to emulation is
part of appropriate execsw[] entry
* constify couple of structures

Make the linux compatibilty code work on the alpha. (horay!) (at last!)
Two main changes:
Create a linux_elf64_copyargs that uses the linux specific LinuxAuxInfo
structure. This is only used on the alpha. i386 and m68k use the
standard elf copyargs function.

Since linux's approach to binary compatibilty is to look as much
like osf1 as possible, add all the osf1 syscalls that we have
implemented to the linux syscall table. This includes get/setsysinfo,
ported from FreeBSD.

In order for linux compat to work you must have COMPAT_OSF1, COMPAT_43,
COMPAT_09, COMPAT_12 and COMPAT_13 on also.

change the type of *syscallnames[] array to 'const char * const foo[]'

remove include of <vm/vm.h>

remove redundant vm includes.

Update to match new SVR4-style definition names in <sys/exec_elf.h>.

branches: 1.42.2; 1.42.4; 1.42.6;
compute the value to be used for e_arglen via howmany(value, sizeof (char *)),
rather than just "value / sizeof (char *)". While in these cases the latter
works as well, the former's a better example for other uses to copy (since
it handles the non-integral multiple case correctly).

branches: 1.41.4;
const poisoning.

Make sure the interpreter string is long enough to check against.

Include linux_errno.h to fix the recent error->errno losage.

Change linux_error to native_to_linux_errno. Add some (unrelated) debugging printfs.

The siginfo include line is not needed here anymore.

unobfuscate: !strncmp() != 0 -> strncmp() == 0

Fix wrong strncmp test.

Assign my copyright to TNF. Merge with others were appropriate.
Regen syscall files after script change.

Remove stray debugging printfs

Attempt to fix the mess.

Split compat/linux/linux_exec.c into common, elf and a.out parts.

Substantial signal handling changes:
* Increase the size of sigset_t to accomodate 128 signals -- adding new
versions of sys_setprocmask(), sys_sigaction(), sys_sigpending() and
sys_sigsuspend() to handle the changed arguments.
* Abstract the guts of sys_sigaltstack(), sys_setprocmask(), sys_sigaction(),
sys_sigpending() and sys_sigsuspend() into separate functions, and call them
from all the emulations rather than hard-coding everything. (Avoids uses
the stackgap crap for these system calls.)
* Add a new flag (p_checksig) to indicate that a process may have signals
pending and userret() needs to do the full (slow) check.
* Eliminate SAS_ALTSTACK; it's exactly the inverse of SS_DISABLE.
* Correct emulation bugs with restoring SS_ONSTACK.
* Make the signal mask in the sigcontext always use the emulated mask format.
* Store signals internally in sigaction structures, rather than maintaining a
bunch of little sigsets for each SA_* bit.
* Keep track of where we put the signal trampoline, rather than figuring it out
in *_sendsig().
* Issue a warning when a non-emulated sigaction bit is observed.
* Add missing emulated signals, and a native SIGPWR (currently not used).
* Implement the `not reset when caught' semantics for relevant signals.

Note: Only code touched by the i386 port has been modified. Other ports and
emulations need to be updated.

Assign copyright to TNF.

bzero->memset, bcopy->memcpy, bcmp->memcmp

Change the "aresid" argument of vn_rdwr() from an int * to a size_t *,
to match the new uio_resid type.

Use linux_setregs().

branches: 1.25.14;
catch up with Jason's exec.h inclusion.

printf -> kprintf, sprintf -> ksprintf

include <sys/exec.h> rather than <machine/exec.h>

update to compile; needs new enum name 'Elf_sht_progbits'

kill (re)definitions of EXEC_ELF32. They're no longer necessary
(because of the EXEC_* option changes), and now cause warnings.

Fix a section header check that didn't get updated with the elf32/elf64
changes. Make this compile again with the new EXEC_* options.

Elf32_sht_progbits -> Elf_sht_progbits

slightly clean up some of the changes made when ELF64 support went in

adapt ELF-using compat code to use new ELF definitions/code. At this point,
these are restricted to 32-bit ELF, and should be severely cleaned.

Define execv() and execve() consistently across emulations.
Do path name translation.

Simplify and add comments.

- Pass the Elf32_Ehdr in the linux probe function, and use it!

Since linux binaries are (mostly) always compiled with gcc, look for
the gcc signature in the .comment section header: "\0 GCC: (GNU) ".
I've changed the probe order in kern/exec_elf.c to probe for linux ELF
binaries first and fall back to SVR4 binaries. This makes statically
linked binaries work for both linux and svr4. Note that gcc-compiled
svr4 binaries, still contain the operating system signature first and
then the GCC signature, so there is no conflict. Yes this is a hack.

branches: 1.13.4;
Prototyping changes.

Prefix names of system call implementation functions with `sys_'.

Make system calls conform to a standard prototype and bring those
prototypes into scope.

Rearrange #includes.

Use compat_util.[ch].

* Changed to use generic ELF code from kern/exec_elf.c (which was taken
from the svr4 exec code plus the linux compat mods)
* Include file change
* Add multicast sockopts (from John Brezak)

Don't forget to acknowledge that all the ELF stuff was taken from
Christos' svr4 code.

* Make Linux ELF binaries work. Lots of code duplication, but it will have to do
for now.
* Add a sanity check in linux_uselib

Generate the new ps_strings format.

- added struct emul to all emulations.
- removed all setup functions.
- added copyargs() functions where needed.

Handle Linux signal tramp code differently. Some changes because of the
now seperate Linux signal trampoline code. Add linux_sigreturn to
syscalls.master.

Added a few more system calls.
More consistent alternate root file semantics throughout.

Added Linux compat code.

Remove clause 3 and 4 from TNF licenses

branches: 1.2.114; 1.2.116; 1.2.118;
add RCSIDs (including regeneration of files as appropriate)

branches: 1.1.24; 1.1.26;
Split compat/linux/linux_exec.c into common, elf and a.out parts.

Do not uselessly include <sys/malloc.h>.

branches: 1.2.2;
Fix fadvise64 syscalls to use 64bit offset types.

branches: 1.1.2; 1.1.6; 1.1.18; 1.1.22; 1.1.32;
Add fadvise64 and fadvise64_64 syscalls to compat_linux and compat_linux32.

Do not uselessly include <sys/malloc.h>.

branches: 1.2.2;
Fix c&p error for the length argument in fadvise64_64.

branches: 1.1.2; 1.1.6; 1.1.8; 1.1.18; 1.1.22; 1.1.32;
Add fadvise64 and fadvise64_64 syscalls to compat_linux and compat_linux32.

Linux GSoC-2024: renameat2, clone3, sync_file_range, syncfs (Shivraj Jamgade)

branches: 1.22.6;
new inotify support GSoC 2023 (Theodore Preduta)

Add memfd_create(2) from GSoC 2023 by Theodore Preduta

- Add compat_linux statx(2) syscall.
- The AT_EMPTY_PATH processing from the modification of
sys/compat/linux/common/linux_file64.c r1.63 has been separated, and made
common to linux_statat(), so that it can be used not only by
linux32_sys_fstatat64() but also by other *statat() variants.

add support COMPAT_LINUX for aarch64

When dealing with an unknown value, set -1, to prevent (harmless)
uninitialized accesses later.

branches: 1.17.10; 1.17.18; 1.17.22;
Add Linux specific fcntl(2) commands. Support F_DUPFD_CLOEXEC.

branches: 1.16.2; 1.16.4; 1.16.10;
Cleanup pipe(2) flags, now that native handle them.

branches: 1.15.2;
Add utimensat(2) for compat linux.

branches: 1.14.34; 1.14.44; 1.14.50;
Remove clause 3 and 4 from TNF licenses

branches: 1.13.2; 1.13.4;
Catch up with descriptor handling changes. See kern_descrip.c revision
1.173 for details.

branches: 1.12.6;
Fix the linux32 emulations of fcntl() locking.
The 64bit linux emulation versions can't be used because the lock structure
alignment and field sizes all differ.
Since there need to be 4 different versions of the linux struct flock, and
amd64 kernel needs 3 of them compiled in, rather than replicating the same
code block twice more, move the body of the code into a few #defines
that can be expanded with the correct types in the linux[32]_sys_fcntl[64]()
functions.
Should fix problems running progams like skype running under linux32
emulation on amd64.

branches: 1.11.46; 1.11.52;
merge ktrace-lwp.

branches: 1.10.2;
First work on COMPAT_LINUX/amd64
Process startup and dynamiclinking work, but processes hang due to
Linux arch_prctl(2) not being really supported yet.