1 files changed, 0 insertions, 159 deletions
diff --git a/vdso/vdso_time.cc b/vdso/vdso_time.cc
deleted file mode 100644
index 1bb4bb86b..000000000
--- a/vdso/vdso_time.cc
+++ /dev/null
@@ -1,159 +0,0 @@
-// Copyright 2018 The gVisor Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "vdso/vdso_time.h"
-
-#include <stdint.h>
-#include <sys/time.h>
-#include <time.h>
-
-#include "vdso/cycle_clock.h"
-#include "vdso/seqlock.h"
-#include "vdso/syscalls.h"
-
-// struct params defines the layout of the parameter page maintained by the
-// kernel (i.e., sentry).
-//
-// This is similar to the VVAR page maintained by the normal Linux kernel for
-// its VDSO, but it has a different layout.
-//
-// It must be kept in sync with VDSOParamPage in pkg/sentry/kernel/vdso.go.
-struct params {
-  uint64_t seq_count;
-
-  uint64_t monotonic_ready;
-  int64_t monotonic_base_cycles;
-  int64_t monotonic_base_ref;
-  uint64_t monotonic_frequency;
-
-  uint64_t realtime_ready;
-  int64_t realtime_base_cycles;
-  int64_t realtime_base_ref;
-  uint64_t realtime_frequency;
-};
-
-// Returns a pointer to the global parameter page.
-//
-// This page lives in the page just before the VDSO binary itself. The linker
-// defines _params as the page before the VDSO.
-//
-// Ideally, we'd simply declare _params as an extern struct params.
-// Unfortunately various combinations of old/new versions of gcc/clang and
-// gold/bfd struggle to generate references to such a global without generating
-// relocations.
-//
-// So instead, we use inline assembly with a construct that seems to have wide
-// compatibility across many toolchains.
-#if __x86_64__
-
-inline struct params* get_params() {
-  struct params* p = nullptr;
-  asm("leaq _params(%%rip), %0" : "=r"(p) : :);
-  return p;
-}
-
-#elif __aarch64__
-
-inline struct params* get_params() {
-  struct params* p = nullptr;
-  asm("adr %0, _params" : "=r"(p) : :);
-  return p;
-}
-
-#else
-#error "unsupported architecture"
-#endif
-
-namespace vdso {
-
-const uint64_t kNsecsPerSec = 1000000000UL;
-
-inline struct timespec ns_to_timespec(uint64_t ns) {
-  struct timespec ts;
-  ts.tv_sec = ns / kNsecsPerSec;
-  ts.tv_nsec = ns % kNsecsPerSec;
-  return ts;
-}
-
-inline uint64_t cycles_to_ns(uint64_t frequency, uint64_t cycles) {
-  uint64_t mult = (kNsecsPerSec << 32) / frequency;
-  return ((unsigned __int128)cycles * mult) >> 32;
-}
-
-// ClockRealtime() is the VDSO implementation of clock_gettime(CLOCK_REALTIME).
-int ClockRealtime(struct timespec* ts) {
-  struct params* params = get_params();
-  uint64_t seq;
-  uint64_t ready;
-  int64_t base_ref;
-  int64_t base_cycles;
-  uint64_t frequency;
-  int64_t now_cycles;
-
-  do {
-    seq = read_seqcount_begin(&params->seq_count);
-    ready = params->realtime_ready;
-    base_ref = params->realtime_base_ref;
-    base_cycles = params->realtime_base_cycles;
-    frequency = params->realtime_frequency;
-    now_cycles = cycle_clock();
-  } while (read_seqcount_retry(&params->seq_count, seq));
-
-  if (!ready) {
-    // The sandbox kernel ensures that we won't compute a time later than this
-    // once the params are ready.
-    return sys_clock_gettime(CLOCK_REALTIME, ts);
-  }
-
-  int64_t delta_cycles =
-      (now_cycles < base_cycles) ? 0 : now_cycles - base_cycles;
-  int64_t now_ns = base_ref + cycles_to_ns(frequency, delta_cycles);
-  *ts = ns_to_timespec(now_ns);
-  return 0;
-}
-
-// ClockMonotonic() is the VDSO implementation of
-// clock_gettime(CLOCK_MONOTONIC).
-int ClockMonotonic(struct timespec* ts) {
-  struct params* params = get_params();
-  uint64_t seq;
-  uint64_t ready;
-  int64_t base_ref;
-  int64_t base_cycles;
-  uint64_t frequency;
-  int64_t now_cycles;
-
-  do {
-    seq = read_seqcount_begin(&params->seq_count);
-    ready = params->monotonic_ready;
-    base_ref = params->monotonic_base_ref;
-    base_cycles = params->monotonic_base_cycles;
-    frequency = params->monotonic_frequency;
-    now_cycles = cycle_clock();
-  } while (read_seqcount_retry(&params->seq_count, seq));
-
-  if (!ready) {
-    // The sandbox kernel ensures that we won't compute a time later than this
-    // once the params are ready.
-    return sys_clock_gettime(CLOCK_MONOTONIC, ts);
-  }
-
-  int64_t delta_cycles =
-      (now_cycles < base_cycles) ? 0 : now_cycles - base_cycles;
-  int64_t now_ns = base_ref + cycles_to_ns(frequency, delta_cycles);
-  *ts = ns_to_timespec(now_ns);
-  return 0;
-}
-
-}  // namespace vdso