Commit Graph

24 Commits

Author SHA1 Message Date
Ed Maste
b267239d4b linuxulator: deduplicate linux_exec_imgact_try
Previously linuxulator had three identical copies of
linux_exec_imgact_try.  Deduplicate before adding another arch to
linuxulator.

Sponsored by:	Turing Robotic Industries Inc
Differential Revision:	https://reviews.freebsd.org/D14856
2018-04-09 17:24:01 +00:00
Ed Maste
1ac2776bbb Share Linux errno table with libsysdecode
Requested by:	jhb
Reviewed by:	jhb
Sponsored by:	Turing Robotic Industries Inc.
2018-03-22 12:58:49 +00:00
Ed Maste
6e481f83f7 Share a single bsd-linux errno table across MD consumers
Three copies of the linuxulator linux_sysvec.c contained identical
BSD to Linux errno translation tables, and future work to support other
architectures will also use the same table.  Move the table to a common
file to be used by all.  Make it 'const int' to place it in .rodata.

(Some existing Linux architectures use MD errno values, but x86 and Arm
share the generic set.)

This change should introduce no functional change; a followup will add
missing errno values.

MFC after:	3 weeks
Sponsored by:	Turing Robotic Industries Inc.
Differential Revision:	https://reviews.freebsd.org/D14665
2018-03-16 14:46:38 +00:00
Ed Maste
023b850b62 Rationalize license text on Linuxolator files
Many licenses on Linuxolator files contained small variations from the
standard FreeBSD license text.  To avoid license proliferation switch to
the standard 2-clause FreeBSD license for those files where I have
permission from each of the listed copyright holders.  Additional files
still waiting on permission from others are listed in review D14210.

Approved by:    dchagin, rdivacky, sos
MFC after:	1 week
MFC with:	r329370
Sponsored by:	The FreeBSD Foundation
2018-03-01 13:52:18 +00:00
Pedro F. Giffuni
7f2d13d607 sys/compat: further adoption of SPDX licensing ID tags.
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-27 15:13:23 +00:00
Dmitry Chagin
23e8912c60 Implement Linux personality() system call mainly due to READ_IMPLIES_EXEC flag.
In Linux if this flag is set, PROT_READ implies PROT_EXEC for mmap().
Linux/i386 set this flag automatically if the binary requires executable stack.

READ_IMPLIES_EXEC flag will be used in the next Linux mmap() commit.
2016-07-10 08:15:50 +00:00
Dmitry Chagin
5dd1d097f8 Print out unsupported futex operation message only once for the process.
Differential Revision:	https://reviews.freebsd.org/D1498
2015-05-24 17:25:57 +00:00
Dmitry Chagin
e16fe1c730 Implement epoll family system calls. This is a tiny wrapper
around kqueue() to implement epoll subset of functionality.
The kqueue user data are 32bit on i386 which is not enough for
epoll user data, so we keep user data in the proc emuldata.

Initial patch developed by rdivacky@ in 2007, then extended
by Yuri Victorovich @ r255672 and finished by me
in collaboration with mjg@ and jillies@.

Differential Revision:	https://reviews.freebsd.org/D1092
2015-05-24 16:41:39 +00:00
Dmitry Chagin
bc27367760 Refund the proc emuldata struct for future use. For now move flags from
thread emuldata to proc emuldata as it was originally intended.

As we can have both 64 & 32 bit Linuxulator running any eventhandler
can be called twice for us. To prevent this move eventhandlers code
from linux_emul.c to the linux_common.ko module.

Differential Revision:	https://reviews.freebsd.org/D1073
2015-05-24 15:54:58 +00:00
Dmitry Chagin
81338031c4 Switch linuxulator to use the native 1:1 threads.
The reasons:
1. Get rid of the stubs/quirks with process dethreading,
   process reparent when the process group leader exits and close
   to this problems on wait(), waitpid(), etc.
2. Reuse our kernel code instead of writing excessive thread
   managment routines in Linuxulator.

Implementation details:

1. The thread is created via kern_thr_new() in the clone() call with
   the CLONE_THREAD parameter. Thus, everything else is a process.
2. The test that the process has a threads is done via P_HADTHREADS
   bit p_flag of struct proc.
3. Per thread emulator state data structure is now located in the
   struct thread and freed in the thread_dtor() hook.
   Mandatory holdig of the p_mtx required when referencing emuldata
   from the other threads.
4. PID mangling has changed. Now Linux pid is the native tid
   and Linux tgid is the native pid, with the exception of the first
   thread in the process where tid and pid are one and the same.

Ugliness:

   In case when the Linux thread is the initial thread in the thread
   group thread id is equal to the process id. Glibc depends on this
   magic (assert in pthread_getattr_np.c). So for system calls that
   take thread id as a parameter we should use the special method
   to reference struct thread.

Differential Revision:	https://reviews.freebsd.org/D1039
2015-05-24 14:53:16 +00:00
Alexander Leidinger
19e252baeb - >500 static DTrace probes for the linuxulator
- DTrace scripts to check for errors, performance, ...
  they serve mostly as examples of what you can do with the static probe;s
  with moderate load the scripts may be overwhelmed, excessive lock-tracing
  may influence program behavior (see the last design decission)

Design decissions:
 - use "linuxulator" as the provider for the native bitsize; add the
   bitsize for the non-native emulation (e.g. "linuxuator32" on amd64)
 - Add probes only for locks which are acquired in one function and released
   in another function. Locks which are aquired and released in the same
   function should be easy to pair in the code, inter-function
   locking is more easy to verify in DTrace.
 - Probes for locks should be fired after locking and before releasing to
   prevent races (to provide data/function stability in DTrace, see the
   man-page of "dtrace -v ..." and the corresponding DTrace docs).
2012-05-05 19:42:38 +00:00
Dmitry Chagin
e5d81ef1b5 Extend struct sysvec with new method sv_schedtail, which is used for an
explicit process at fork trampoline path instead of eventhadler(schedtail)
invocation for each child process.

Remove eventhandler(schedtail) code and change linux ABI to use newly added
sysvec method.

While here replace explicit comparing of module sysentvec structure with the
newly created process sysentvec to detect the linux ABI.

Discussed with:	kib

MFC after:	2 Week
2011-03-08 19:01:45 +00:00
Dmitry Chagin
d14cc07d07 Rename used_requeue and use it as bitwise field to store more flags.
Reimplement used_requeue logic with LINUX_XDEPR_REQUEUEOP flag.
2011-02-12 20:58:59 +00:00
Alexander Leidinger
bb63fdde6d By using the 32-bit Linux version of Sun's Java Development Kit 1.6
on FreeBSD (amd64), invocations of "javac" (or "java") eventually
end with the output of "Killed" and exit code 137.

This is caused by:
1. After calling exec() in multithreaded linux program threads are not
   destroyed and continue running. They get killed after program being
   executed finishes.

2. linux_exit_group doesn't return correct exit code when called not
   from group leader. Which happens regularly using sun jvm.

The submitters fix this in a similar way to how NetBSD handles this.

I took the PRs away from dchagin, who seems to be out of touch of
this since a while (no response from him).

The patches committed here are from [2], with some little modifications
from me to the style.

PR:		141439 [1], 144194 [2]
Submitted by:	Stefan Schmidt <stefan.schmidt@stadtbuch.de>, gk
Reviewed by:	rdivacky (in april 2010)
MFC after:	5 days
2010-11-22 09:06:59 +00:00
Dmitry Chagin
b1121623d2 Remove support for FUTEX_REQUEUE operation.
Glibc does not use this operation since 2.3.3 version (Jun 2004),
as it is racy and replaced by FUTEX_CMP_REQUEUE operation.
Glibc versions prior to 2.3.3 fall back to FUTEX_WAKE when
FUTEX_REQUEUE returned EINVAL.

Any application directly using FUTEX_REQUEUE without return
value checking are definitely broken.

Limit quantity of messages per process about unsupported
operation.

Approved by:	kib (mentor)
MFC after:	1 month
2009-04-19 13:48:42 +00:00
Dmitry Chagin
3b8cbbded3 Include linux_futex.h before linux_emul.h
Approved by:	kib (mentor)
MFC after:	6 days
2009-03-15 19:16:12 +00:00
Roman Divacky
4732e446fb Implement robust futexes. Most of the code is modelled after
what Linux does. This is because robust futexes are mostly
userspace thing which we cannot alter. Two syscalls maintain
pointer to userspace list and when process exits a routine
walks this list waking up processes sleeping on futexes
from that list.

Reviewed by:	kib (mentor)
MFC after:	1 month
2008-05-13 20:01:27 +00:00
Jung-uk Kim
357afa7113 MFP4: Turn emul_lock into a mutex.
Submitted by:	rdivacky
2007-04-02 18:38:13 +00:00
Alexander Leidinger
1c65504ca8 MFp4 (112498):
Rename the locking flags to EMUL_DOLOCK and EMUL_DONTLOCK to prevent confusion.

Submitted by:	rdivacky
2007-01-07 19:00:38 +00:00
Alexander Leidinger
a628609ee9 MFp4:
- semi-automatic style fixes
2006-12-31 12:42:55 +00:00
Alexander Leidinger
955d762aca MFP4:
Implement prctl().

Submitted by:	rdivacky
Tested with:	LTP
2006-10-28 10:59:59 +00:00
Alexander Leidinger
94cb2ecf79 Move some stuff into headers where they belong.
Sponsored by:	Google SoC 2006
Submitted by:	rdivacky
Noticed by:	jhb, ssouhlal
2006-08-17 21:06:48 +00:00
Alexander Leidinger
0eef2f8a4e Style fixes to comments.
Sponsored by:	Google SoC 2006
Submitted by:	rdivacky
Noticed by:	jhb, ssouhlal
2006-08-16 18:54:51 +00:00
Alexander Leidinger
ad2056f2c4 Add some new files needed for linux 2.6.x compatibility.
Please don't style(9) the NetBSD code, we want to stay in sync. Not imported
on a vendor branch since we need local changes.

Sponsored by:	Google SoC 2006
Submitted by:	rdivacky
With help from:	manu@NetBSD.org
Obtained from:	NetBSD (linux_{futex,time}.*)
2006-08-15 12:20:59 +00:00