linux-user: Add support for adjtimex() syscall
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>
diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index 9fdbe86..ca8fa6e 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -207,6 +207,34 @@
struct target_timespec it_value;
};
+struct target_timex {
+ abi_uint modes; /* Mode selector */
+ abi_long offset; /* Time offset */
+ abi_long freq; /* Frequency offset */
+ abi_long maxerror; /* Maximum error (microseconds) */
+ abi_long esterror; /* Estimated error (microseconds) */
+ abi_int status; /* Clock command/status */
+ abi_long constant; /* PLL (phase-locked loop) time constant */
+ abi_long precision; /* Clock precision (microseconds, ro) */
+ abi_long tolerance; /* Clock freq. tolerance (ppm, ro) */
+ struct target_timeval time; /* Current time */
+ abi_long tick; /* Microseconds between clock ticks */
+ abi_long ppsfreq; /* PPS (pulse per second) frequency */
+ abi_long jitter; /* PPS jitter (ro); nanoseconds */
+ abi_int shift; /* PPS interval duration (seconds) */
+ abi_long stabil; /* PPS stability */
+ abi_long jitcnt; /* PPS jitter limit exceeded (ro) */
+ abi_long calcnt; /* PPS calibration intervals */
+ abi_long errcnt; /* PPS calibration errors */
+ abi_long stbcnt; /* PPS stability limit exceeded */
+ abi_int tai; /* TAI offset */
+
+ /* Further padding bytes to allow for future expansion */
+ abi_int:32; abi_int:32; abi_int:32; abi_int:32;
+ abi_int:32; abi_int:32; abi_int:32; abi_int:32;
+ abi_int:32; abi_int:32; abi_int:32;
+};
+
typedef abi_long target_clock_t;
#define TARGET_HZ 100
