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//===-- mapping.h -----------------------------------------------*- C++ -*-===//
//
// The KLEE Symbolic Virtual Machine
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef KDALLOC_MAPPING_H
#define KDALLOC_MAPPING_H
#include <cassert>
#include <cstddef>
#include <cstdint>
#include <cstdlib>
#include <utility>
#include <sys/mman.h>
#include <unistd.h>
#if defined(__linux__)
#include <linux/version.h>
#endif
#if defined(__APPLE__)
#include <mach/vm_map.h>
#include <sys/types.h>
#endif
#include "klee/Support/ErrorHandling.h"
namespace klee::kdalloc {
class Mapping {
void *baseAddress = MAP_FAILED;
std::size_t size = 0;
bool try_map(std::uintptr_t baseAddress) noexcept {
assert(this->baseAddress == MAP_FAILED);
int flags = MAP_ANON | MAP_PRIVATE;
#if defined(__linux__)
flags |= MAP_NORESERVE;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 17, 0)
if (baseAddress != 0) {
flags |= MAP_FIXED_NOREPLACE;
}
#endif
#elif defined(__FreeBSD__)
if (baseAddress != 0) {
flags |= MAP_FIXED | MAP_EXCL;
}
#endif
auto mappedAddress = ::mmap(reinterpret_cast<void *>(baseAddress), size,
PROT_READ | PROT_WRITE, flags, -1, 0);
if (baseAddress != 0 &&
baseAddress != reinterpret_cast<std::uintptr_t>(mappedAddress)) {
[[maybe_unused]] int rc = ::munmap(mappedAddress, size);
assert(rc == 0 && "munmap failed");
this->baseAddress = MAP_FAILED;
return false;
}
if (mappedAddress == MAP_FAILED) {
this->baseAddress = MAP_FAILED;
return false;
}
this->baseAddress = mappedAddress;
#if defined(__linux__)
{
[[maybe_unused]] int rc =
::madvise(this->baseAddress, size,
MADV_NOHUGEPAGE | MADV_DONTFORK | MADV_RANDOM);
assert(rc == 0 && "madvise failed");
}
#elif defined(__FreeBSD__)
{
[[maybe_unused]] int rc =
::minherit(this->baseAddress, size, INHERIT_NONE);
assert(rc == 0 && "minherit failed");
}
#elif defined(__APPLE__)
{
[[maybe_unused]] int rc =
::minherit(this->baseAddress, size, VM_INHERIT_NONE);
assert(rc == 0 && "minherit failed");
}
#endif
return true;
}
public:
Mapping() = default;
explicit Mapping(std::size_t size) noexcept : Mapping(0, size) {}
Mapping(std::uintptr_t baseAddress, std::size_t size) noexcept : size(size) {
try_map(baseAddress);
assert(*this && "failed to allocate mapping");
if (!*this) {
std::abort();
}
}
Mapping(Mapping const &) = delete;
Mapping &operator=(Mapping const &) = delete;
Mapping(Mapping &&other) noexcept
: baseAddress(other.baseAddress), size(other.size) {
other.baseAddress = MAP_FAILED;
other.size = 0;
}
Mapping &operator=(Mapping &&other) noexcept {
if (&other != this) {
using std::swap;
swap(other.baseAddress, baseAddress);
swap(other.size, size);
}
return *this;
}
[[nodiscard]] void *getBaseAddress() const noexcept {
assert(*this && "Invalid mapping");
return baseAddress;
}
[[nodiscard]] std::size_t getSize() const noexcept { return size; }
void clear() {
assert(*this && "Invalid mapping");
#if defined(__linux__)
[[maybe_unused]] int rc = ::madvise(baseAddress, size, MADV_DONTNEED);
assert(rc == 0 && "madvise failed");
#else
auto address = reinterpret_cast<std::uintptr_t>(baseAddress);
[[maybe_unused]] int rc = ::munmap(baseAddress, size);
assert(rc == 0 && "munmap failed");
baseAddress = MAP_FAILED;
[[maybe_unused]] auto success = try_map(address);
assert(success && "could not recreate the mapping");
#endif
}
explicit operator bool() const noexcept { return baseAddress != MAP_FAILED; }
~Mapping() {
if (*this) {
[[maybe_unused]] int rc = ::munmap(baseAddress, size);
assert(rc == 0 && "munmap failed");
}
}
};
} // namespace klee::kdalloc
#endif
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