384ef4841a
On 32-bit platforms, our 64-bit timestamps need to be split up across two registers. A simple assignment to td_retval[0] will cause the top 32 bits to get lost. By using memcpy(), we will automatically either use 1 or 2 registers depending on the size of register_t.
135 lines
3.8 KiB
C
135 lines
3.8 KiB
C
/*-
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* Copyright (c) 2015 Nuxi, https://nuxi.nl/
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/stdint.h>
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#include <sys/syscallsubr.h>
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#include <contrib/cloudabi/cloudabi_types_common.h>
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#include <compat/cloudabi/cloudabi_proto.h>
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#include <compat/cloudabi/cloudabi_util.h>
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/* Converts a CloudABI clock ID to a FreeBSD clock ID. */
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static int
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cloudabi_convert_clockid(cloudabi_clockid_t in, clockid_t *out)
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{
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switch (in) {
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case CLOUDABI_CLOCK_MONOTONIC:
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*out = CLOCK_MONOTONIC;
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return (0);
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case CLOUDABI_CLOCK_PROCESS_CPUTIME_ID:
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*out = CLOCK_PROCESS_CPUTIME_ID;
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return (0);
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case CLOUDABI_CLOCK_REALTIME:
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*out = CLOCK_REALTIME;
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return (0);
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case CLOUDABI_CLOCK_THREAD_CPUTIME_ID:
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*out = CLOCK_THREAD_CPUTIME_ID;
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return (0);
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default:
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return (EINVAL);
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}
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}
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/* Converts a struct timespec to a CloudABI timestamp. */
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int
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cloudabi_convert_timespec(const struct timespec *in, cloudabi_timestamp_t *out)
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{
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cloudabi_timestamp_t s, ns;
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if (in->tv_sec < 0) {
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/* Timestamps from before the Epoch cannot be expressed. */
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*out = 0;
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return (EOVERFLOW);
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}
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s = in->tv_sec;
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ns = in->tv_nsec;
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if (s > UINT64_MAX / 1000000000 ||
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(s == UINT64_MAX / 1000000000 && ns > UINT64_MAX % 1000000000)) {
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/* Addition of seconds and nanoseconds would overflow. */
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*out = UINT64_MAX;
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return (EOVERFLOW);
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}
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*out = s * 1000000000 + ns;
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return (0);
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}
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/* Fetches the time value of a clock. */
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int
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cloudabi_clock_time_get(struct thread *td, cloudabi_clockid_t clock_id,
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cloudabi_timestamp_t *ret)
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{
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struct timespec ts;
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int error;
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clockid_t clockid;
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error = cloudabi_convert_clockid(clock_id, &clockid);
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if (error != 0)
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return (error);
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error = kern_clock_gettime(td, clockid, &ts);
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if (error != 0)
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return (error);
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return (cloudabi_convert_timespec(&ts, ret));
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}
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int
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cloudabi_sys_clock_res_get(struct thread *td,
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struct cloudabi_sys_clock_res_get_args *uap)
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{
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struct timespec ts;
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cloudabi_timestamp_t cts;
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int error;
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clockid_t clockid;
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error = cloudabi_convert_clockid(uap->clock_id, &clockid);
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if (error != 0)
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return (error);
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error = kern_clock_getres(td, clockid, &ts);
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if (error != 0)
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return (error);
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error = cloudabi_convert_timespec(&ts, &cts);
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if (error != 0)
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return (error);
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memcpy(td->td_retval, &cts, sizeof(cts));
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return (0);
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}
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int
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cloudabi_sys_clock_time_get(struct thread *td,
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struct cloudabi_sys_clock_time_get_args *uap)
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{
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cloudabi_timestamp_t ts;
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int error;
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error = cloudabi_clock_time_get(td, uap->clock_id, &ts);
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memcpy(td->td_retval, &ts, sizeof(ts));
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return (error);
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}
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