FEX-Emu--FEX/Source/Tools/LinuxEmulation/LinuxSyscalls/x64/Memory.cpp

// SPDX-License-Identifier: MIT
/*
$info$
tags: LinuxSyscalls|syscalls-x86-64
$end_info$
*/

#include "LinuxSyscalls/LinuxAllocator.h"
#include "LinuxSyscalls/Syscalls.h"
#include "LinuxSyscalls/x64/Syscalls.h"
#include <FEXCore/Core/Context.h>
#include <FEXCore/Debug/InternalThreadState.h>

#include <FEXCore/IR/IR.h>

#include <sys/mman.h>
#include <sys/shm.h>
#include <unistd.h>

#include <FEXCore/Core/Context.h>
#include <FEXCore/Config/Config.h>
#include <FEXCore/Utils/Allocator.h>

namespace FEX::HLE::x64 {

void* x64SyscallHandler::GuestMmap(FEXCore::Core::InternalThreadState* Thread, void* addr, size_t length, int prot, int flags, int fd, off_t offset) {
  uint64_t Result {};

  bool Map32Bit = flags & FEX::HLE::X86_64_MAP_32BIT;
  if (Map32Bit) {
    Result = (uint64_t)Get32BitAllocator()->Mmap(addr, length, prot, flags, fd, offset);
    if (FEX::HLE::HasSyscallError(Result)) {
      errno = -Result;
      Result = -1;
    }
  } else {
    Result = reinterpret_cast<uint64_t>(::mmap(reinterpret_cast<void*>(addr), length, prot, flags, fd, offset));
  }

  if (Result != -1) {
    FEX::HLE::_SyscallHandler->TrackMmap(Thread, (uintptr_t)Result, length, prot, flags, fd, offset);
  }

  return reinterpret_cast<void*>(Result);
}

int x64SyscallHandler::GuestMunmap(FEXCore::Core::InternalThreadState* Thread, void* addr, uint64_t length) {
  uint64_t Result {};
  if (reinterpret_cast<uintptr_t>(addr) < 0x1'0000'0000ULL) {
    Result = Get32BitAllocator()->Munmap(addr, length);

    if (FEX::HLE::HasSyscallError(Result)) {
      errno = -Result;
      Result = -1;
    }
  } else {
    Result = ::munmap(addr, length);
  }

  if (Result != -1) {
    FEX::HLE::_SyscallHandler->TrackMunmap(Thread, reinterpret_cast<uintptr_t>(addr), length);
  }

  return Result;
}

void RegisterMemory(FEX::HLE::SyscallHandler* Handler) {
  using namespace FEXCore::IR;

  REGISTER_SYSCALL_IMPL_X64_FLAGS(
    mmap, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
    [](FEXCore::Core::CpuStateFrame* Frame, void* addr, size_t length, int prot, int flags, int fd, off_t offset) -> uint64_t {
      uint64_t Result = (uint64_t) static_cast<FEX::HLE::x64::x64SyscallHandler*>(FEX::HLE::_SyscallHandler)
                          ->GuestMmap(Frame->Thread, addr, length, prot, flags, fd, offset);

      SYSCALL_ERRNO();
    });

  REGISTER_SYSCALL_IMPL_X64_FLAGS(
    munmap, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
    [](FEXCore::Core::CpuStateFrame* Frame, void* addr, size_t length) -> uint64_t {
      uint64_t Result = static_cast<FEX::HLE::x64::x64SyscallHandler*>(FEX::HLE::_SyscallHandler)->GuestMunmap(Frame->Thread, addr, length);

      SYSCALL_ERRNO();
    });

  REGISTER_SYSCALL_IMPL_X64_FLAGS(
    mremap, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
    [](FEXCore::Core::CpuStateFrame* Frame, void* old_address, size_t old_size, size_t new_size, int flags, void* new_address) -> uint64_t {
      uint64_t Result = reinterpret_cast<uint64_t>(::mremap(old_address, old_size, new_size, flags, new_address));

      if (Result != -1) {
        FEX::HLE::_SyscallHandler->TrackMremap(Frame->Thread, (uintptr_t)old_address, old_size, new_size, flags, Result);
      }
      SYSCALL_ERRNO();
    });

  REGISTER_SYSCALL_IMPL_X64_FLAGS(mprotect, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
                                  [](FEXCore::Core::CpuStateFrame* Frame, void* addr, size_t len, int prot) -> uint64_t {
                                    uint64_t Result = ::mprotect(addr, len, prot);

                                    if (Result != -1) {
                                      FEX::HLE::_SyscallHandler->TrackMprotect(Frame->Thread, (uintptr_t)addr, len, prot);
                                    }
                                    SYSCALL_ERRNO();
                                  });

  REGISTER_SYSCALL_IMPL_X64_FLAGS(shmat, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
                                  [](FEXCore::Core::CpuStateFrame* Frame, int shmid, const void* shmaddr, int shmflg) -> uint64_t {
                                    uint64_t Result = reinterpret_cast<uint64_t>(shmat(shmid, shmaddr, shmflg));

                                    if (Result != -1) {
                                      FEX::HLE::_SyscallHandler->TrackShmat(Frame->Thread, shmid, Result, shmflg);
                                    }
                                    SYSCALL_ERRNO();
                                  });

  REGISTER_SYSCALL_IMPL_X64_FLAGS(shmdt, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
                                  [](FEXCore::Core::CpuStateFrame* Frame, const void* shmaddr) -> uint64_t {
                                    uint64_t Result = ::shmdt(shmaddr);

                                    if (Result != -1) {
                                      FEX::HLE::_SyscallHandler->TrackShmdt(Frame->Thread, (uintptr_t)shmaddr);
                                    }
                                    SYSCALL_ERRNO();
                                  });
}
} // namespace FEX::HLE::x64