FEX-Emu--FEX/Source/Tools/LinuxEmulation/LinuxSyscalls/x32/Memory.cpp

// SPDX-License-Identifier: MIT
/*
$info$
tags: LinuxSyscalls|syscalls-x86-32
$end_info$
*/

#include "LinuxSyscalls/Syscalls.h"
#include "LinuxSyscalls/x32/Syscalls.h"
#include "LinuxSyscalls/x64/Syscalls.h"
#include <FEXCore/Core/Context.h>
#include <FEXCore/Core/CoreState.h>
#include <FEXCore/Debug/InternalThreadState.h>

#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <sys/mman.h>
#include <system_error>
#include <filesystem>

namespace FEX::HLE::x32 {

void* x32SyscallHandler::GuestMmap(FEXCore::Core::InternalThreadState* Thread, void* addr, size_t length, int prot, int flags, int fd, off_t offset) {
  LOGMAN_THROW_AA_FMT((length >> 32) == 0, "values must fit to 32 bits");

  auto Result = (uint64_t)GetAllocator()->Mmap((void*)addr, length, prot, flags, fd, offset);

  LOGMAN_THROW_AA_FMT((Result >> 32) == 0 || (Result >> 32) == 0xFFFFFFFF, "values must fit to 32 bits");

  if (!FEX::HLE::HasSyscallError(Result)) {
    FEX::HLE::_SyscallHandler->TrackMmap(Thread, Result, length, prot, flags, fd, offset);
    return (void*)Result;
  } else {
    errno = -Result;
    return MAP_FAILED;
  }
}

int x32SyscallHandler::GuestMunmap(FEXCore::Core::InternalThreadState* Thread, void* addr, uint64_t length) {
  LOGMAN_THROW_AA_FMT((uintptr_t(addr) >> 32) == 0, "values must fit to 32 bits");
  LOGMAN_THROW_AA_FMT((length >> 32) == 0, "values must fit to 32 bits");

  auto Result = GetAllocator()->Munmap(addr, length);

  if (Result == 0) {
    FEX::HLE::_SyscallHandler->TrackMunmap(Thread, (uintptr_t)addr, length);
    return Result;
  } else {
    errno = -Result;
    return -1;
  }
}

void RegisterMemory(FEX::HLE::SyscallHandler* Handler) {
  struct old_mmap_struct {
    uint32_t addr;
    uint32_t len;
    uint32_t prot;
    uint32_t flags;
    uint32_t fd;
    uint32_t offset;
  };
  REGISTER_SYSCALL_IMPL_X32(mmap, [](FEXCore::Core::CpuStateFrame* Frame, const old_mmap_struct* arg) -> uint64_t {
    uint64_t Result = (uint64_t) static_cast<FEX::HLE::x32::x32SyscallHandler*>(FEX::HLE::_SyscallHandler)
                        ->GuestMmap(Frame->Thread, reinterpret_cast<void*>(arg->addr), arg->len, arg->prot, arg->flags, arg->fd, arg->offset);

    SYSCALL_ERRNO();
  });

  REGISTER_SYSCALL_IMPL_X32(
    mmap2, [](FEXCore::Core::CpuStateFrame* Frame, uint32_t addr, uint32_t length, int prot, int flags, int fd, uint32_t pgoffset) -> uint64_t {
      uint64_t Result = (uint64_t) static_cast<FEX::HLE::x32::x32SyscallHandler*>(FEX::HLE::_SyscallHandler)
                          ->GuestMmap(Frame->Thread, reinterpret_cast<void*>(addr), length, prot, flags, fd, (uint64_t)pgoffset * 0x1000);

      SYSCALL_ERRNO();
    });

  REGISTER_SYSCALL_IMPL_X32(munmap, [](FEXCore::Core::CpuStateFrame* Frame, void* addr, size_t length) -> uint64_t {
    uint64_t Result =
      (uint64_t) static_cast<FEX::HLE::x32::x32SyscallHandler*>(FEX::HLE::_SyscallHandler)->GuestMunmap(Frame->Thread, addr, length);

    SYSCALL_ERRNO();
  });

  REGISTER_SYSCALL_IMPL_X32(mprotect, [](FEXCore::Core::CpuStateFrame* Frame, void* addr, uint32_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_X32(
    mremap, [](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>(
        static_cast<FEX::HLE::x32::x32SyscallHandler*>(FEX::HLE::_SyscallHandler)->GetAllocator()->Mremap(old_address, old_size, new_size, flags, new_address));

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

      return Result;
    });

  REGISTER_SYSCALL_IMPL_X32(mlockall, [](FEXCore::Core::CpuStateFrame* Frame, int flags) -> uint64_t {
    uint64_t Result = ::syscall(SYSCALL_DEF(mlock2), reinterpret_cast<void*>(0x1'0000), 0x1'0000'0000ULL - 0x1'0000, flags);
    SYSCALL_ERRNO();
  });

  REGISTER_SYSCALL_IMPL_X32(munlockall, [](FEXCore::Core::CpuStateFrame* Frame) -> uint64_t {
    uint64_t Result = ::munlock(reinterpret_cast<void*>(0x1'0000), 0x1'0000'0000ULL - 0x1'0000);
    SYSCALL_ERRNO();
  });

  REGISTER_SYSCALL_IMPL_X32(shmat, [](FEXCore::Core::CpuStateFrame* Frame, int shmid, const void* shmaddr, int shmflg) -> uint64_t {
    // also implemented in ipc:OP_SHMAT
    uint32_t ResultAddr {};
    uint64_t Result = static_cast<FEX::HLE::x32::x32SyscallHandler*>(FEX::HLE::_SyscallHandler)
                        ->GetAllocator()
                        ->Shmat(shmid, reinterpret_cast<const void*>(shmaddr), shmflg, &ResultAddr);

    if (!FEX::HLE::HasSyscallError(Result)) {
      FEX::HLE::_SyscallHandler->TrackShmat(Frame->Thread, shmid, ResultAddr, shmflg);
      return ResultAddr;
    } else {
      return Result;
    }
  });

  REGISTER_SYSCALL_IMPL_X32(shmdt, [](FEXCore::Core::CpuStateFrame* Frame, const void* shmaddr) -> uint64_t {
    // also implemented in ipc:OP_SHMDT
    uint64_t Result = static_cast<FEX::HLE::x32::x32SyscallHandler*>(FEX::HLE::_SyscallHandler)->GetAllocator()->Shmdt(shmaddr);

    if (!FEX::HLE::HasSyscallError(Result)) {
      FEX::HLE::_SyscallHandler->TrackShmdt(Frame->Thread, (uintptr_t)shmaddr);
    }

    return Result;
  });
}

} // namespace FEX::HLE::x32