dchagin [Sun, 24 May 2015 17:59:17 +0000 (17:59 +0000)]
Convert signal number to native for VT_SETMODE ioctl and remove
strange and invalid ISSIGVALID macro.
The code has not been tested right way but it was originally broken.
dchagin [Sun, 24 May 2015 17:56:02 +0000 (17:56 +0000)]
The kernel sends signals to the processes via ABI specific sv_sendsig method.
Native ABI do not need signal conversion, only emulators may want this. Usually
emulators implements its own sv_sendsig method. For now only ibcs2 emulator does
not have own sv_sendsig implementation and depends on native sendsig() method.
So, remove any extra attempts to convert signal numbers from native sendsig()
methods except from i386 where ibsc2 is living.
dchagin [Sun, 24 May 2015 17:47:20 +0000 (17:47 +0000)]
Rework signal code to allow using it by other modules, like linprocfs:
1. Linux sigset always 64 bit on all platforms. In order to move Linux
sigset code to the linux_common module define it as 64 bit int. Move
Linux sigset manipulation routines to the MI path.
2. Move Linux signal number definitions to the MI path. In general, they
are the same on all platforms except for a few signals.
3. Map Linux RT signals to the FreeBSD RT signals and hide signal conversion
tables to avoid conversion errors.
4. Emulate Linux SIGPWR signal via FreeBSD SIGRTMIN signal which is outside
of allowed on Linux signal numbers.
dchagin [Sun, 24 May 2015 17:44:08 +0000 (17:44 +0000)]
According to Linux man sigaltstack(3) shall return EINVAL if the ss
argument is not a null pointer, and the ss_flags member pointed to by ss
contains flags other than SS_DISABLE. However, in fact, Linux also
allows SS_ONSTACK flag which is simply ignored.
For buggy apps (at least mono) ignore other than SS_DISABLE
flags as a Linux do.
While here move MI part of sigaltstack code to the appropriate place.
dchagin [Sun, 24 May 2015 17:26:58 +0000 (17:26 +0000)]
As for now our tmpfs is no longer being considered
"highly experimental" remove /dev/shm magic commited
in r218497 and convert tmpfs type to an expected magic number.
dchagin [Sun, 24 May 2015 16:41:39 +0000 (16:41 +0000)]
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@.
dchagin [Sun, 24 May 2015 16:36:29 +0000 (16:36 +0000)]
For future use in the Linuxulator:
1. Add a kern_kqueue() counterpart for kqueue() with flags parameter.
2. Be a bit secure. To avoid a double fp lookup add a kern_kevent_fp()
counterpart for kern_kevent() with file pointer parameter instead
of file descriptor an pass the buck to it.
dchagin [Sun, 24 May 2015 16:28:58 +0000 (16:28 +0000)]
Convert Linux wait options to the FreeBSD.
Check wait options as a Linux do.
Linux always set WEXITED option not a WUNTRACED|WNOHANG
which is a strange bug.
dchagin [Sun, 24 May 2015 16:26:55 +0000 (16:26 +0000)]
Rewrite linux_recvfrom. To avoid double conversion of sockaddr use
kern_recvit() directly.
And check fromlen parameter before sockaddr copyin and conversion.
dchagin [Sun, 24 May 2015 16:25:44 +0000 (16:25 +0000)]
Being exported through vdso the note.Linux section used by glibc
to determine the kernel version (this saves one uname call).
Temporarily disable the export of a note.Linux section until I figured
out how to change the kernel version in the note.Linux on the fly.
dchagin [Sun, 24 May 2015 16:18:03 +0000 (16:18 +0000)]
Change linux faccessat syscall definition to match actual linux one.
The AT_EACCESS and AT_SYMLINK_NOFOLLOW flags are actually implemented
within the glibc wrapper function for faccessat(). If either of these
flags are specified, then the wrapper function employs fstatat() to
determine access permissions.
dchagin [Sun, 24 May 2015 15:54:58 +0000 (15:54 +0000)]
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.
dchagin [Sun, 24 May 2015 15:51:18 +0000 (15:51 +0000)]
Introduce a new module linux_common.ko which is intended for the
following primary purposes:
1. Remove the dependency of linsysfs and linprocfs modules from linux.ko,
which will be architecture specific on amd64.
2. Incorporate into linux_common.ko general code for platforms on which
we'll support two Linuxulator modules (for both instruction set - 32 & 64 bit).
3. Move malloc(9) declaration to linux_common.ko, to enable getting memory
usage statistics properly.
Currently linux_common.ko incorporates a code from linux_mib.c and linux_util.c
and linprocfs, linsysfs and linux kernel modules depend on linux_common.ko.
Temporarily remove dtrace garbage from linux_mib.c and linux_util.c
Differential Revision: https://reviews.freebsd.org/D1072
In collaboration with: Vassilis Laganakos.
tijl [Sun, 24 May 2015 15:47:06 +0000 (15:47 +0000)]
When only 2 bytes can be read from a 4 byte UTF-16 character in a base64
encoded chunk of a UTF-7 string, treat that as an incomplete character and
return an error instead of a shift sequence and no error.
Also check that the low 2 bytes have a valid value.
dchagin [Sun, 24 May 2015 15:28:17 +0000 (15:28 +0000)]
Implement vdso - virtual dynamic shared object. Through vdso Linux
exposes functions from kernel with proper DWARF CFI information so that
it becomes easier to unwind through them.
Using vdso is a mandatory for a thread cancelation && cleanup
on a modern glibc.
tijl [Sun, 24 May 2015 15:27:31 +0000 (15:27 +0000)]
Fix decoding of UTF-7 when a base64 encoded chunk appears at the end of
the input buffer.
_citrus_UTF7_mbtoutf16 stored the decoder state at the beginning so it
could restore this state on an incomplete character such that the next
call would restart the decoding. The problem was that "-" (end of base64
mode) at the end of a string was also treated as an incomplete character
but was also removed from the state buffer. So the initial state would be
restored (with base64 mode) and the next call would no longer see the "-"
so it continued in base64 mode.
This state saving/restoring isn't needed here. It's already handled
elsewhere (citrus_iconv_std.c:_citrus_iconv_std_iconv_convert) so just
remove it.
dchagin [Sun, 24 May 2015 15:03:09 +0000 (15:03 +0000)]
To reduce code duplication introduce linux_copyout_rusage() method.
Use it in linux_wait4() system call and move linux_wait4() to the MI path.
While here add a prototype for the static bsd_to_linux_rusage().
dchagin [Sun, 24 May 2015 14:54:12 +0000 (14:54 +0000)]
pthread_join() caller do futex_wait on child_clear_tid. As a results
of multiple simultaneous calls to pthread_join() specifying the same
target thread are undefined wake up the one thread.
dchagin [Sun, 24 May 2015 14:53:16 +0000 (14:53 +0000)]
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.
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