This patch implements Qemu user mode syncfs() syscall support. Syscall
syncfs() syncs the filesystem containing file determined by the open
file descriptor passed as the argument to syncfs().
The implementation consists of a straightforward invocation of host's
syncfs(). Configure and strace support is included as well.
Signed-off-by: Aleksandar Markovic <aleksandar.markovic@imgtec.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This patch implements Qemu user mode clock_adjtime() syscall support.
The implementation is based on invocation of host's clock_adjtime().
Signed-off-by: Aleksandar Rikalo <aleksandar.rikalo@imgtec.com>
Signed-off-by: Aleksandar Markovic <aleksandar.markovic@imgtec.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
There is a duplicate item in strace.list. It is benign, but it
shouldn't be there, since it may lead to confusion and even bugs
in the future. It is the only duplicate in strace.list. This
patch removes it.
Signed-off-by: Aleksandar Markovic <aleksandar.markovic@imgtec.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
There are currently several problems related to syslog() support.
For example, if the second argument "bufp" of target syslog() syscall
is NULL, the current implementation always returns error code EFAULT.
However, NULL is a perfectly valid value for the second argument for
many use cases of this syscall. This is, for example, visible from
this excerpt of man page for syslog(2):
> EINVAL Bad arguments (e.g., bad type; or for type 2, 3, or 4, buf is
> NULL, or len is less than zero; or for type 8, the level is
> outside the range 1 to 8).
Moreover, the argument "bufp" is ignored for all cases of values of the
first argument, except 2, 3 and 4. This means that for such cases
(the first argument is not 2, 3 or 4), there is no need to pass "buf"
between host and target, and it can be set to NULL while calling host's
syslog(), without loss of emulation accuracy.
Note also that if "bufp" is NULL and the first argument is 2, 3 or 4, the
correct returned error code is EINVAL, not EFAULT.
All these details are reflected in this patch.
"#ifdef TARGET_NR_syslog" is also proprerly inserted when needed.
Support for Qemu's "-strace" switch for syslog() syscall is included too.
LTP tests syslog11 and syslog12 pass with this patch (while fail without
it), on any platform.
Changes to original patch by Riku Voipio:
fixed error paths in TARGET_SYSLOG_ACTION_READ_ALL to match
http://lxr.free-electrons.com/source/kernel/printk/printk.c?v=4.7#L1335
Should fix also the build error in:
https://lists.gnu.org/archive/html/qemu-devel/2016-10/msg03721.html
Signed-off-by: Aleksandar Markovic <aleksandar.markovic@imgtec.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This patch implements Qemu user mode adjtimex() syscall support.
Syscall adjtimex() reads and optionally sets parameters for a clock
adjustment algorithm used in network synchonization or similar scenarios.
Its declaration is:
int adjtimex(struct timex *buf);
The correspondent source code in the Linux kernel is at kernel/time.c,
line 206.
The Qemu implementation is based on invocation of host's adjtimex(), and
its key part is in the "TARGET_NR_adjtimex" case segment of the the main
switch statement of the function do_syscall(), in linux-user/syscalls.c. All
necessary conversions of the data structures from target to host and from
host to target are covered. Two new functions, target_to_host_timex() and
host_to_target_timex(), are provided for the purpose of such conversions.
For that purpose, the support for related structure "timex" had tp be added
to the file linux-user/syscall_defs.h, based on its definition in Linux
kernel. Also, the relevant support for "-strace" Qemu option is included
in files linux-user/strace.c and linux-user/strace.list.
This patch also fixes failures of LTP tests adjtimex01 and adjtimex02, if
executed in Qemu user mode.
Signed-off-by: Aleksandar Rikalo <aleksandar.rikalo@imgtec.com>
Signed-off-by: Aleksandar Markovic <aleksandar.markovic@imgtec.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Without this patch, a number of Mips syscalls will be logged in the following
way (in this example, this is an invocation of accept4()):
86906 Unknown syscall 4334
This patch provides standard Qemu's strace output for such cases, like this:
95861 accept4(3,1996486000,1996486016,128,0,0) = 5
Such output may be further improved by providing strace-related functions
that handle only particular syscalls, but this is beyond the scope of
this patch.
Signed-off-by: Aleksandar Markovic <aleksandar.markovic@imgtec.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Acked-by: Riku Voipio <riku.voipio@linaro.org>
Signed-off-by: Leon Alrae <leon.alrae@imgtec.com>
Add support for the setns and unshare syscalls, trivially passed through to
the host. Based on patches by Paul Burton, added configure check.
Signed-off-by: Paul Burton <paul@archlinuxmips.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Adds support for the timerfd_create, timerfd_gettime & timerfd_settime
syscalls, allowing use of timerfds by target programs.
v2: By Riku - added configure check for timerfd and ifdefs
for benefit of old distributions like RHEL5.
Signed-off-by: Paul Burton <paul@archlinuxmips.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Add the epoll_create1 syscall to strace.list in order to display that
syscall when it occurs, rather than a message about the syscall being
unknown despite QEMU already implementing support for it.
Signed-off-by: Paul Burton <paul@archlinuxmips.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
With nptl enabled, atomic_cmpxchg_32 and atomic_barrier
system calls are needed. This patch enabled really dummy
versions of the system calls, modeled after the m68k
kernel code.
With this patch I am able to execute m68k binaries
with qemu linux-user (busybox compiled for coldfire).
[v2] que an segfault instead of returning a EFAULT
to keep in line with kernel code.
Cc: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
It has been pointed out on LKML that the alpha umount syscall numbers
are named wrong, and a patch to rectify that has been posted for 3.11.
Glibc works around this by treating NR_umount as NR_umount2 if
NR_oldumount exists. That's more complicated than we need in QEMU,
given that we control linux-user/*/syscall_nr.h.
This is the last instance of TARGET_NR_oldumount, so delete that from
the strace.list.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
The Linux syscalls underlying pread() and pwrite() take a 64 bit
offset on all architectures, even if some of them name the syscall
"pread/pwrite" rather than "pread64/pwrite64" for historical reasons.
So move the four QEMU target architectures (arm, i386, sparc,
unicore32) which were defining TARGET_NR_pread/pwrite to define
TARGET_NR_pread64/pwrite64 instead, and drop the TARGET_NR_pread/pwrite
implementation code completely.
(Based on examination of the kernel sources for the four architectures
this patch affects.)
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
Implement the missing syscalls sync_file_range and sync_file_range2.
The latter in particular is used by newer versions of apt on Ubuntu
for ARM.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@iki.fi>
- to not to break strace with GUEST_BASE is set:
- Strace now can load and print guest strings correctly.
- Added printing support for commonly used flags in some syscalls
(e.g open, creat, mmap etc.)
v2:
- fix strace.c build on etch
- add futex print to strace
Signed-off-by: Mika Westerberg <mika.westerberg@iki.fi>
Signed-off-by: Riku Voipio <riku.voipio@iki.fi>
The shmat syscall returns an address, so we must use the
print_syscall_ret_addr function.
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5565 c046a42c-6fe2-441c-8c8c-71466251a162
Aleksandar Markovic