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>
This commit is contained in:
Aleksandar Markovic
Riku Voipio
parent
da158a86c4
commit
19f59bcef9
@ -577,6 +577,52 @@ print_syscall_ret_newselect(const struct syscallname *name, abi_long ret)
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}
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#endif
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/* special meanings of adjtimex()' non-negative return values */
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#define TARGET_TIME_OK 0 /* clock synchronized, no leap second */
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#define TARGET_TIME_INS 1 /* insert leap second */
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#define TARGET_TIME_DEL 2 /* delete leap second */
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#define TARGET_TIME_OOP 3 /* leap second in progress */
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#define TARGET_TIME_WAIT 4 /* leap second has occurred */
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#define TARGET_TIME_ERROR 5 /* clock not synchronized */
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static void
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print_syscall_ret_adjtimex(const struct syscallname *name, abi_long ret)
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{
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const char *errstr = NULL;
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gemu_log(" = ");
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if (ret < 0) {
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gemu_log("-1 errno=%d", errno);
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errstr = target_strerror(-ret);
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if (errstr) {
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gemu_log(" (%s)", errstr);
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}
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} else {
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gemu_log(TARGET_ABI_FMT_ld, ret);
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switch (ret) {
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case TARGET_TIME_OK:
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gemu_log(" TIME_OK (clock synchronized, no leap second)");
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break;
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case TARGET_TIME_INS:
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gemu_log(" TIME_INS (insert leap second)");
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break;
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case TARGET_TIME_DEL:
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gemu_log(" TIME_DEL (delete leap second)");
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break;
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case TARGET_TIME_OOP:
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gemu_log(" TIME_OOP (leap second in progress)");
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break;
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case TARGET_TIME_WAIT:
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gemu_log(" TIME_WAIT (leap second has occurred)");
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break;
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case TARGET_TIME_ERROR:
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gemu_log(" TIME_ERROR (clock not synchronized)");
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break;
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}
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}
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gemu_log("\n");
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}
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UNUSED static struct flags access_flags[] = {
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FLAG_GENERIC(F_OK),
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FLAG_GENERIC(R_OK),
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@ -19,7 +19,8 @@
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{ TARGET_NR_add_key, "add_key" , NULL, NULL, NULL },
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#endif
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#ifdef TARGET_NR_adjtimex
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{ TARGET_NR_adjtimex, "adjtimex" , NULL, NULL, NULL },
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{ TARGET_NR_adjtimex, "adjtimex" , "%s(%p)", NULL,
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print_syscall_ret_adjtimex },
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#endif
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#ifdef TARGET_NR_afs_syscall
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{ TARGET_NR_afs_syscall, "afs_syscall" , NULL, NULL, NULL },
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@ -35,6 +35,7 @@
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#include <sys/swap.h>
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#include <linux/capability.h>
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#include <sched.h>
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#include <sys/timex.h>
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#ifdef __ia64__
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int __clone2(int (*fn)(void *), void *child_stack_base,
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size_t stack_size, int flags, void *arg, ...);
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@ -6770,6 +6771,77 @@ static inline abi_long host_to_target_itimerspec(abi_ulong target_addr,
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return 0;
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}
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static inline abi_long target_to_host_timex(struct timex *host_tx,
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abi_long target_addr)
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{
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struct target_timex *target_tx;
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if (!lock_user_struct(VERIFY_READ, target_tx, target_addr, 1)) {
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return -TARGET_EFAULT;
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}
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__get_user(host_tx->modes, &target_tx->modes);
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__get_user(host_tx->offset, &target_tx->offset);
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__get_user(host_tx->freq, &target_tx->freq);
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__get_user(host_tx->maxerror, &target_tx->maxerror);
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__get_user(host_tx->esterror, &target_tx->esterror);
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__get_user(host_tx->status, &target_tx->status);
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__get_user(host_tx->constant, &target_tx->constant);
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__get_user(host_tx->precision, &target_tx->precision);
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__get_user(host_tx->tolerance, &target_tx->tolerance);
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__get_user(host_tx->time.tv_sec, &target_tx->time.tv_sec);
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__get_user(host_tx->time.tv_usec, &target_tx->time.tv_usec);
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__get_user(host_tx->tick, &target_tx->tick);
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__get_user(host_tx->ppsfreq, &target_tx->ppsfreq);
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__get_user(host_tx->jitter, &target_tx->jitter);
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__get_user(host_tx->shift, &target_tx->shift);
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__get_user(host_tx->stabil, &target_tx->stabil);
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__get_user(host_tx->jitcnt, &target_tx->jitcnt);
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__get_user(host_tx->calcnt, &target_tx->calcnt);
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__get_user(host_tx->errcnt, &target_tx->errcnt);
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__get_user(host_tx->stbcnt, &target_tx->stbcnt);
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__get_user(host_tx->tai, &target_tx->tai);
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unlock_user_struct(target_tx, target_addr, 0);
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return 0;
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}
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static inline abi_long host_to_target_timex(abi_long target_addr,
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struct timex *host_tx)
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{
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struct target_timex *target_tx;
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if (!lock_user_struct(VERIFY_WRITE, target_tx, target_addr, 0)) {
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return -TARGET_EFAULT;
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}
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__put_user(host_tx->modes, &target_tx->modes);
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__put_user(host_tx->offset, &target_tx->offset);
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__put_user(host_tx->freq, &target_tx->freq);
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__put_user(host_tx->maxerror, &target_tx->maxerror);
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__put_user(host_tx->esterror, &target_tx->esterror);
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__put_user(host_tx->status, &target_tx->status);
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__put_user(host_tx->constant, &target_tx->constant);
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__put_user(host_tx->precision, &target_tx->precision);
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__put_user(host_tx->tolerance, &target_tx->tolerance);
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__put_user(host_tx->time.tv_sec, &target_tx->time.tv_sec);
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__put_user(host_tx->time.tv_usec, &target_tx->time.tv_usec);
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__put_user(host_tx->tick, &target_tx->tick);
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__put_user(host_tx->ppsfreq, &target_tx->ppsfreq);
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__put_user(host_tx->jitter, &target_tx->jitter);
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__put_user(host_tx->shift, &target_tx->shift);
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__put_user(host_tx->stabil, &target_tx->stabil);
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__put_user(host_tx->jitcnt, &target_tx->jitcnt);
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__put_user(host_tx->calcnt, &target_tx->calcnt);
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__put_user(host_tx->errcnt, &target_tx->errcnt);
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__put_user(host_tx->stbcnt, &target_tx->stbcnt);
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__put_user(host_tx->tai, &target_tx->tai);
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unlock_user_struct(target_tx, target_addr, 1);
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return 0;
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}
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static inline abi_long target_to_host_sigevent(struct sigevent *host_sevp,
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abi_ulong target_addr)
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{
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@ -9543,7 +9615,20 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
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#endif
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#endif
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case TARGET_NR_adjtimex:
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goto unimplemented;
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{
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struct timex host_buf;
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if (target_to_host_timex(&host_buf, arg1) != 0) {
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goto efault;
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}
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ret = get_errno(adjtimex(&host_buf));
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if (!is_error(ret)) {
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if (host_to_target_timex(arg1, &host_buf) != 0) {
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goto efault;
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}
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}
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}
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break;
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#ifdef TARGET_NR_create_module
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case TARGET_NR_create_module:
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#endif
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@ -207,6 +207,34 @@ struct target_itimerspec {
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struct target_timespec it_value;
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};
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struct target_timex {
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abi_uint modes; /* Mode selector */
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abi_long offset; /* Time offset */
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abi_long freq; /* Frequency offset */
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abi_long maxerror; /* Maximum error (microseconds) */
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abi_long esterror; /* Estimated error (microseconds) */
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abi_int status; /* Clock command/status */
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abi_long constant; /* PLL (phase-locked loop) time constant */
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abi_long precision; /* Clock precision (microseconds, ro) */
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abi_long tolerance; /* Clock freq. tolerance (ppm, ro) */
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struct target_timeval time; /* Current time */
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abi_long tick; /* Microseconds between clock ticks */
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abi_long ppsfreq; /* PPS (pulse per second) frequency */
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abi_long jitter; /* PPS jitter (ro); nanoseconds */
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abi_int shift; /* PPS interval duration (seconds) */
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abi_long stabil; /* PPS stability */
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abi_long jitcnt; /* PPS jitter limit exceeded (ro) */
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abi_long calcnt; /* PPS calibration intervals */
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abi_long errcnt; /* PPS calibration errors */
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abi_long stbcnt; /* PPS stability limit exceeded */
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abi_int tai; /* TAI offset */
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/* Further padding bytes to allow for future expansion */
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abi_int:32; abi_int:32; abi_int:32; abi_int:32;
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abi_int:32; abi_int:32; abi_int:32; abi_int:32;
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abi_int:32; abi_int:32; abi_int:32;
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};
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typedef abi_long target_clock_t;
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#define TARGET_HZ 100
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