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//===-- Unittests for VDSO ------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "hdr/signal_macros.h"
#include "hdr/time_macros.h"
#include "hdr/types/clockid_t.h"
#include "hdr/types/struct_sigaction.h"
#include "hdr/types/struct_timespec.h"
#include "hdr/types/struct_timeval.h"
#include "hdr/types/time_t.h"
#include "src/__support/OSUtil/linux/vdso.h"
#include "src/__support/OSUtil/syscall.h"
#include "src/__support/macros/properties/architectures.h"
#include "src/signal/raise.h"
#include "src/signal/sigaction.h"
#include "test/UnitTest/ErrnoSetterMatcher.h"
#include "test/UnitTest/Test.h"
#include <linux/time_types.h>
#include <sys/syscall.h>
struct riscv_hwprobe {
int64_t key;
uint64_t value;
};
namespace LIBC_NAMESPACE_DECL {
// For x86_64, we explicitly test some traditional vdso symbols are indeed
// available.
TEST(LlvmLibcOSUtilVDSOTest, GetTimeOfDay) {
vdso::TypedSymbol<vdso::VDSOSym::GetTimeOfDay> symbol;
if (!symbol)
return;
timeval tv;
EXPECT_EQ(symbol(&tv, nullptr), 0);
// hopefully people are not building time machines using our libc.
EXPECT_GT(tv.tv_sec, static_cast<decltype(tv.tv_sec)>(0));
}
TEST(LlvmLibcOSUtilVDSOTest, Time) {
vdso::TypedSymbol<vdso::VDSOSym::Time> symbol;
if (!symbol)
return;
time_t a, b;
EXPECT_GT(symbol(&a), static_cast<time_t>(0));
EXPECT_GT(symbol(&b), static_cast<time_t>(0));
EXPECT_GE(b, a);
}
TEST(LlvmLibcOSUtilVDSOTest, ClockGetTime) {
vdso::TypedSymbol<vdso::VDSOSym::ClockGetTime> symbol;
if (!symbol)
return;
timespec a, b;
EXPECT_EQ(symbol(CLOCK_MONOTONIC, &a), 0);
EXPECT_EQ(symbol(CLOCK_MONOTONIC, &b), 0);
if (a.tv_sec == b.tv_sec) {
EXPECT_LT(a.tv_nsec, b.tv_nsec);
} else {
EXPECT_LT(a.tv_sec, b.tv_sec);
}
}
TEST(LlvmLibcOSUtilVDSOTest, ClockGetTime64) {
vdso::TypedSymbol<vdso::VDSOSym::ClockGetTime64> symbol;
if (!symbol)
return;
// See kernel API at
// https://elixir.bootlin.com/linux/latest/source/tools/testing/selftests/vDSO/vdso_test_correctness.c#L155
__kernel_timespec a, b;
EXPECT_EQ(symbol(CLOCK_MONOTONIC, &a), 0);
EXPECT_EQ(symbol(CLOCK_MONOTONIC, &b), 0);
if (a.tv_sec == b.tv_sec) {
EXPECT_LT(a.tv_nsec, b.tv_nsec);
} else {
EXPECT_LT(a.tv_sec, b.tv_sec);
}
}
TEST(LlvmLibcOSUtilVDSOTest, ClockGetRes) {
vdso::TypedSymbol<vdso::VDSOSym::ClockGetRes> symbol;
if (!symbol)
return;
timespec res{};
EXPECT_EQ(symbol(CLOCK_MONOTONIC, &res), 0);
EXPECT_TRUE(res.tv_sec > 0 || res.tv_nsec > 0);
}
TEST(LlvmLibcOSUtilVDSOTest, GetCpu) {
// The kernel system call has a third argument, which should be passed as
// nullptr.
vdso::TypedSymbol<vdso::VDSOSym::GetCpu> symbol;
if (!symbol)
return;
unsigned cpu = static_cast<unsigned>(-1), node = static_cast<unsigned>(-1);
EXPECT_EQ(symbol(&cpu, &node, nullptr), 0);
EXPECT_GE(cpu, 0u);
EXPECT_GE(node, 0u);
}
static bool flag = false;
static void sigprof_handler [[gnu::used]] (int) { flag = true; }
TEST(LlvmLibcOSUtilVDSOTest, RtSigReturn) {
using namespace testing::ErrnoSetterMatcher;
// must use struct since there is a function of the same name in the same
// scope.
struct sigaction sa{};
struct sigaction old_sa{};
sa.sa_handler = sigprof_handler;
sa.sa_flags = SA_RESTORER;
vdso::TypedSymbol<vdso::VDSOSym::RTSigReturn> symbol;
if (!symbol)
return;
sa.sa_restorer = symbol;
ASSERT_THAT(LIBC_NAMESPACE::sigaction(SIGPROF, &sa, &old_sa), Succeeds());
raise(SIGPROF);
ASSERT_TRUE(flag);
flag = false;
ASSERT_THAT(LIBC_NAMESPACE::sigaction(SIGPROF, &old_sa, nullptr), Succeeds());
}
TEST(LlvmLibcOSUtilVDSOTest, FlushICache) {
vdso::TypedSymbol<vdso::VDSOSym::FlushICache> symbol;
if (!symbol)
return;
char buf[512];
// we just check that the flush will not panic the program.
// the flags part only take 0/1 as up to kernel 6.10, which is used to
// indicate whether the flush is local to the core or global.
symbol(buf, buf + sizeof(buf), 0);
symbol(buf, buf + sizeof(buf), 1);
}
// https://docs.kernel.org/6.5/riscv/hwprobe.html
TEST(LlvmLibcOSUtilVDSOTest, RiscvHwProbe) {
using namespace testing::ErrnoSetterMatcher;
vdso::TypedSymbol<vdso::VDSOSym::RiscvHwProbe> symbol;
if (!symbol)
return;
// If a key is unknown to the kernel, its key field will be cleared to -1, and
// its value set to 0. We expect probes.value are all 0.
// Usermode can supply NULL for cpus and 0 for cpu_count as a shortcut for all
// online CPUs
riscv_hwprobe probes[2] = {{-1, 1}, {-1, 1}};
ASSERT_THAT(symbol(/*pairs=*/probes, /*count=*/2, /*cpusetsize=*/0,
/*cpuset=*/nullptr,
/*flags=*/0),
Succeeds());
for (auto &probe : probes) {
EXPECT_EQ(probe.key, static_cast<decltype(probe.key)>(-1));
EXPECT_EQ(probe.value, static_cast<decltype(probe.value)>(0));
}
}
TEST(LlvmLibcOSUtilVDSOTest, GetRandom) {
using namespace testing::ErrnoSetterMatcher;
vdso::TypedSymbol<vdso::VDSOSym::GetRandom> symbol;
if (!symbol)
return;
// This structure exists in kernel UAPI header; but we define it on our own to
// make sure we can test it even on platform without support.
struct VGetrandomOpaqueParams {
uint32_t size_of_opaque_states;
uint32_t mmap_prot;
uint32_t mmap_flags;
uint32_t reserved[13];
};
VGetrandomOpaqueParams param{0, 0, 0, {}};
// When getrandom vDSO symbol is called with special parameters (~0 for state
// size), it populates the desired configuration into VGetrandomOpaqueParams.
int res = symbol(
/*buf=*/nullptr, /*count=*/0, /*flags=*/0,
/*opaque_states=*/¶m,
/*size_of_opaque_states=*/~0);
// Test that the size of the states are correctly populated after a successful
// call.
EXPECT_EQ(res, 0);
EXPECT_GT(param.size_of_opaque_states, 0u);
}
} // namespace LIBC_NAMESPACE_DECL
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