linux-user: Add support for 'clock_nanosleep_time64()' and 'clock_adjtime64()'

This patch implements functionality for following time64 syscall:

*clock_nanosleep_time64()

    This is a year 2038 safe vairant of syscall:
    int clock_nanosleep(clockid_t clockid, int flags,
                        const struct timespec *request,
                        struct timespec *remain)
    --high-resolution sleep with specifiable clock--
    man page: https://man7.org/linux/man-pages/man2/clock_nanosleep.2.html

*clock_adjtime64()

    This is a year 2038 safe variant of syscall:
    int clock_adjtime(clockid_t clk_id, struct timex *buf)
    --tune kernel clock--
    man page: https://man7.org/linux/man-pages/man2/clock_adjtime.2.html

Implementation notes:

    Syscall 'clock_nanosleep_time64()' was implemented similarly
    to syscall 'clock_nanosleep()' except that 'host_to_target_timespec64()'
    and 'target_to_host_timespec64()' were used instead of the regular
    'host_to_target_timespec()' and 'target_to_host_timespec()'.

    For 'clock_adjtime64()' a 64-bit target kernel version of 'struct timex'
    was defined in 'syscall_defs.h': 'struct target__kernel_timex'.
    This type was used to convert the values of 64-bit timex type between
    host and target. For this purpose a 64-bit timex converting functions
    'target_to_host_timex64()' and 'host_to_target_timex64()'. An existing
    function 'copy_to_user_timeval64()' was used to convert the field
    'time' which if of type 'struct timeval' from host to target.
    Function 'copy_from_user_timveal64()' was added in this patch and
    used to convert the 'time' field from target to host.

Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20200824192116.65562-2-Filip.Bozuta@syrmia.com>
[lv: add missing ifdef's]
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

1 files changed, 31 insertions, 0 deletions

diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index a6abc7e70b..9d07991176 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -294,6 +294,37 @@ struct target_timex {
     abi_int:32; abi_int:32; abi_int:32;
 };
 
+struct target__kernel_timex {
+    abi_uint modes;               /* Mode selector */
+    abi_int: 32;                  /* pad */
+    abi_llong offset;             /* Time offset */
+    abi_llong freq;               /* Frequency offset */
+    abi_llong maxerror;           /* Maximum error (microseconds) */
+    abi_llong esterror;           /* Estimated error (microseconds) */
+    abi_int status;               /* Clock command/status */
+    abi_int: 32;                  /* pad */
+    abi_llong constant;           /* PLL (phase-locked loop) time constant */
+    abi_llong precision;          /* Clock precision (microseconds, ro) */
+    abi_llong tolerance;          /* Clock freq. tolerance (ppm, ro) */
+    struct target__kernel_sock_timeval time;  /* Current time */
+    abi_llong tick;               /* Microseconds between clock ticks */
+    abi_llong ppsfreq;            /* PPS (pulse per second) frequency */
+    abi_llong jitter;             /* PPS jitter (ro); nanoseconds */
+    abi_int shift;                /* PPS interval duration (seconds) */
+    abi_int: 32;                  /* pad */
+    abi_llong stabil;             /* PPS stability */
+    abi_llong jitcnt;             /* PPS jitter limit exceeded (ro) */
+    abi_llong calcnt;             /* PPS calibration intervals */
+    abi_llong errcnt;             /* PPS calibration errors */
+    abi_llong 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