Commit Graph

12760 Commits

Author SHA1 Message Date
Konstantin Belousov
b24de3ac40 Provide npx_get_fsave(9) and npx_set_fsave(9) functions to obtain and
restore the FPU state from the format of machine FSAVE area.  The
intended use is for ABI emulators to provide FSAVE-formatted FPU state
to usermode requiring it, while kernel could use FXSAVE due to
XMM/XSAVE.

The core functionality to convert from/to FXSAVE format is shared with
the fill_fpregs_xmm() and set_fpregs_xmm().  Move the later functions
to npx.c and rename them to npx_fill_fpregs_xmm() and
npx_set_fpregs_xmm().  They differ from nptx_get/set_fsave(9) since
our mcontext contains padding to be zeroed or ignored.

fill_fpregs() and set_fpregs() could be converted to use the new
interface, but there are small differences to handle.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2015-06-29 12:06:36 +00:00
Konstantin Belousov
f9343dacbd Move CS_SECURE() and EFL_SECURE() macros to the machine/frame.h. They
are useful for most implementations of sendsig().

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2015-06-29 10:35:00 +00:00
Konstantin Belousov
3ac3c0f269 Add a comment about too strong semantic of atomic_load_acq() on x86.
Submitted by:	bde
MFC after:	2 weeks
2015-06-29 09:58:40 +00:00
Konstantin Belousov
1817023775 Add x86 PT_GETFSBASE, PT_GETGSBASE machine-depended ptrace requests to
obtain the thread %fs and %gs bases.  Add x86 PT_SETFSBASE and
PT_SETGSBASE requests to set the bases from debuggers.  The set
requests, similarly to the sysarch({I386,AMD64}_SET_FSBASE),
override the corresponding segment registers.

The main purpose of the operations is to retrieve and modify the tcb
address for debuggee.

Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
2015-06-29 07:07:24 +00:00
Konstantin Belousov
06d058bd23 Reduce code duplication. Add helper fill_based_sd(9) which creates a
based user data descriptor covering whole VA.

Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
2015-06-29 06:59:08 +00:00
Konstantin Belousov
7626d062c3 Remove unneeded data dependency, currently imposed by
atomic_load_acq(9), on it source, for x86.

Right now, atomic_load_acq() on x86 is sequentially consistent with
other atomics, code ensures this by doing store/load barrier by
performing locked nop on the source.  Provide separate primitive
__storeload_barrier(), which is implemented as the locked nop done on
a cpu-private variable, and put __storeload_barrier() before load, to
keep seq_cst semantic but avoid introducing false dependency on the
no-modification of the source for its later use.

Note that seq_cst property of x86 atomic_load_acq() is not documented
and not carried by atomics implementations on other architectures,
although some kernel code relies on the behaviour.  This commit does
not intend to change this.

Reviewed by:	alc
Discussed with:	bde
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
2015-06-28 05:04:08 +00:00
Mateusz Guzik
4da8456f0a Replace struct filedesc argument in getvnode with struct thread
This is is a step towards removal of spurious arguments.
2015-06-16 13:09:18 +00:00
John Baldwin
5eb95e11ba Report the values of x86 segment registers to remote debuggers.
While here, also report %eflags from the i386 trapframe.

Differential Revision:	https://reviews.freebsd.org/D2743
Reviewed by:	kib
Obtained from:	1 month
2015-06-12 15:14:08 +00:00
John Baldwin
9f9d9cf33e Ensure that the upper 16 bits of segment registers manually saved in
trapframes are cleared by explicitly pushing a zero and then moving
the segment register into the low 16 bits.  Certain Intel processors
treat a push of a segment register as a move of the segment register
into the low 16 bits leaving the upper 16 bits of the word in the
stack unchanged.

Reviewed by:	kib
MFC after:	1 month
2015-06-12 15:06:17 +00:00
Ruslan Bukin
4f4d15f0d0 Allow DTrace to be compiled-in to the kernel.
This will require for AArch64 as we dont have modules yet.

Sponsored by:	HEIF5
Sponsored by:	ARM Ltd.
Differential Revision:	https://reviews.freebsd.org/D1997
2015-06-10 15:53:39 +00:00
Mateusz Guzik
f6f6d24062 Implement lockless resource limits.
Use the same scheme implemented to manage credentials.

Code needing to look at process's credentials (as opposed to thred's) is
provided with *_proc variants of relevant functions.

Places which possibly had to take the proc lock anyway still use the proc
pointer to access limits.
2015-06-10 10:48:12 +00:00
Mateusz Guzik
4ea6a9a28f Generalised support for copy-on-write structures shared by threads.
Thread credentials are maintained as follows: each thread has a pointer to
creds and a reference on them. The pointer is compared with proc's creds on
userspace<->kernel boundary and updated if needed.

This patch introduces a counter which can be compared instead, so that more
structures can use this scheme without adding more comparisons on the boundary.
2015-06-10 10:43:59 +00:00
Alan Cox
65a9768f62 Account for superpage mappings that are created by pmap_copy(). 2015-06-09 18:04:28 +00:00
Dimitry Andric
90acdcbc88 Merge r283870 from amd64:
Remove unneeded NULL checks in trap_fatal().

Since td_name is an array member of struct thread, it can never be NULL,
so the check can be removed.  In addition, curproc can never be NULL,
so remove the if statement, and splice the two printfs() together.

While here, remove the u_long cast, and use the correct printf format
specifier for curproc->p_pid.

Requested by:	jhb
MFC after:	3 days
2015-06-08 20:12:44 +00:00
Alan Cox
966272ca33 Retire VM_FREEPOOL_CACHE as the next step in eliminating PG_CACHE pages.
Differential Revision:	https://reviews.freebsd.org/D2712
Reviewed by:	kib
Sponsored by:	EMC / Isilon Storage Division
2015-06-08 04:59:32 +00:00
Konstantin Belousov
32a1e9e4a5 Update print_INTEL_TLB() by the tag values from the Intel SDM
rev. 55.  The modern CPUs cache and TLB descriptions looked quite
questionable without the update, e.g. Haswell i7 4770S reported:
	Data TLB: 4 KB pages, 4-way set associative, 64 entries
	L2 cache: 256 kbytes, 8-way associative, 64 bytes/line
After the update, the report is:
	Data TLB: 1 GByte pages, 4-way set associative, 4 entries
	Data TLB: 4 KB pages, 4-way set associative, 64 entries
	Instruction TLB: 2M/4M pages, fully associative, 8 entries
	Instruction TLB: 4KByte pages, 8-way set associative, 64 entries
	64-Byte prefetching
	Shared 2nd-Level TLB: 4 KByte/2MByte pages, 8-way associative, 1024 entries
	L2 cache: 256 kbytes, 8-way associative, 64 bytes/line
Some tags were apparently removed from the table 3-21, Vol. 2A.  Keep
them around, but add a comment stating the removal.

Update the format line for cpu_stdext_feature according to the bits
from the SDM rev.55.  It appears that Haswells do not store %cs and
%ds values in the FPU save area.

Store content of the %ecx register from the CPUID leaf 0x7
subleaf 0 as cpu_stdext_feature2 and print defined bits from it,
again acording to SDM rev. 55.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2015-06-06 22:03:24 +00:00
Dmitry Chagin
d707582f83 When I merged the lemul branch I missied kib@'s r282708 commit.
This is not the final fix as I need properly cleanup thread resources
before other threads suicide.

Tested by:	Ruslan Makhmatkhanov
2015-05-25 20:44:46 +00:00
Dmitry Chagin
5c5aac2d45 Regen for r283492. 2015-05-24 18:09:01 +00:00
Dmitry Chagin
9802eb9ebc Implement Linux specific syncfs() system call. 2015-05-24 18:08:01 +00:00
Dmitry Chagin
c532a88cfc Regen for r283488. 2015-05-24 18:05:21 +00:00
Dmitry Chagin
e1ff74c0f7 Implement recvmmsg() and sendmmsg() system calls. 2015-05-24 18:04:04 +00:00
Dmitry Chagin
b7aaa9fdb0 Reduce duplication between MD Linux code by moving msg related
struct definitions out into the compat/linux/linux_socket.h
2015-05-24 18:03:14 +00:00
Dmitry Chagin
3ce05165b1 Regen for r283484. 2015-05-24 18:02:17 +00:00
Dmitry Chagin
6e4c8004dc Implement epoll_pwait() system call. 2015-05-24 18:00:14 +00:00
Dmitry Chagin
ca045164a7 Regen for r283480. 2015-05-24 17:58:24 +00:00
Dmitry Chagin
19d8b461f4 Add utimensat() system call.
The patch developed by Jilles Tjoelker and Andrew Wilcox and
adopted for lemul branch by me.
2015-05-24 17:57:07 +00:00
Dmitry Chagin
0c38abc250 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.
2015-05-24 17:56:02 +00:00
Dmitry Chagin
4ab7403bbd 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.

PR:		197216
2015-05-24 17:47:20 +00:00
Dmitry Chagin
a7ac457613 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.

Reported by:	abi at abinet dot ru
2015-05-24 17:44:08 +00:00
Dmitry Chagin
657100de57 Regen for r283467. 2015-05-24 17:39:18 +00:00
Dmitry Chagin
fcdffc03f8 Call nosys in case when the incorrect syscall number is specified.
Reported by:	trinity
2015-05-24 17:38:02 +00:00
Dmitry Chagin
8d939ad405 Regen for r283465. 2015-05-24 17:35:42 +00:00
Dmitry Chagin
b6aeb7d5dd Add preliminary fallocate system call implementation
to emulate posix_fallocate() function.

Differential Revision:	https://reviews.freebsd.org/D1523
Reviewed by:	emaste
2015-05-24 17:33:21 +00:00
Dmitry Chagin
274d2df2e5 Regen for r283451. 2015-05-24 17:00:43 +00:00
Dmitry Chagin
a6b40812ec Implement ppoll() system call.
Differential Revision:	https://reviews.freebsd.org/D1105
Reviewed by:	trasz
2015-05-24 16:59:25 +00:00
Dmitry Chagin
22f3dfdc12 Regen for r283444. 2015-05-24 16:50:17 +00:00
Dmitry Chagin
a31d76867d Implement eventfd system call.
Differential Revision:	https://reviews.freebsd.org/D1094
In collaboration with:	Jilles Tjoelker
2015-05-24 16:49:14 +00:00
Dmitry Chagin
3e89b64168 Put the correct value for the abi_nfdbits parameter of kern_select() for
all supported Linuxulators.

Differential Revision:	https://reviews.freebsd.org/D1093
Reviewed by:	trasz
2015-05-24 16:47:13 +00:00
Dmitry Chagin
28fb55359b Regen for r283441. 2015-05-24 16:42:49 +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
4d0f380d87 To avoid code duplication move open/fcntl definitions to the MI
header file.

Differential Revision:	https://reviews.freebsd.org/D1087
Reviewed by:	trasz
2015-05-24 16:31:44 +00:00
Dmitry Chagin
26c68e1fe5 Use the BSD_TO_LINUX_SIGNAL() wherever there is no need
to check the ABI as it is known.

Differential Revision:	https://reviews.freebsd.org/D1086
2015-05-24 16:30:23 +00:00
Dmitry Chagin
437c43c1cb 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.

Differential Revision:	https://reviews.freebsd.org/D1081
Reviewed by:	trasz
2015-05-24 16:25:44 +00:00
Dmitry Chagin
4048f59cd0 Add AT_RANDOM and AT_EXECFN auxiliary vector entries which are used by
glibc. At list since glibc version 2.16 using AT_RANDOM is mandatory.

Differential Revision:	https://reviews.freebsd.org/D1080
2015-05-24 16:24:24 +00:00
Dmitry Chagin
0a1884d768 Regen for r283428. 2015-05-24 16:19:57 +00:00
Dmitry Chagin
baa232bbfd 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.

Differential Revision:	https://reviews.freebsd.org/D1078
Reviewed by:	trasz
2015-05-24 16:18:03 +00:00
Dmitry Chagin
67d3974849 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.

Reviewed by:	trasz
2015-05-24 15:51:18 +00:00
Dmitry Chagin
31eb438886 x86_64 Linux do not use multiplexing on ipc system calls.
Move struct ipc_perm definition to the MD path as it differs for 64 and
32 bit platform.

Differential Revision:	https://reviews.freebsd.org/D1068
Reviewed by:	trasz
2015-05-24 15:44:41 +00:00
Dmitry Chagin
26cf41d6ca Remove stale comment about a signal trampoline which
is moved to the shared page at r219609.

Differential Revision:	https://reviews.freebsd.org/D1063
Reviewed by:	trasz
2015-05-24 15:32:52 +00:00
Dmitry Chagin
0020bdf13a Put linux_platform into the vdso to avoid copying it onto the stack at
every exec.

Differential Revision:	https://reviews.freebsd.org/D1062
Reviewed by:	trasz
2015-05-24 15:30:52 +00:00