FEX-Emu--FEX/Source/Tools/LinuxEmulation/LinuxSyscalls/Syscalls/FD.cpp

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

#include "LinuxSyscalls/Syscalls.h"
#include "LinuxSyscalls/x64/Syscalls.h"
#include "LinuxSyscalls/x32/Syscalls.h"

#include <FEXCore/IR/IR.h>

#include <FEXHeaderUtils/Syscalls.h>

#include <fcntl.h>
#include <stdint.h>
#include <sys/file.h>
#include <sys/eventfd.h>
#include <sys/inotify.h>
#include <sys/mman.h>
#include <sys/timerfd.h>
#include <poll.h>
#include <stddef.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/eventfd.h>
#include <sys/syscall.h>

namespace FEX::HLE {
void RegisterFD(FEX::HLE::SyscallHandler* Handler) {
  using namespace FEXCore::IR;
  REGISTER_SYSCALL_IMPL_FLAGS(poll, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
                              [](FEXCore::Core::CpuStateFrame* Frame, struct pollfd* fds, nfds_t nfds, int timeout) -> uint64_t {
                                if (nfds) {
                                  // fds is allowed to be garbage if nfds is zero.
                                  FaultSafeUserMemAccess::VerifyIsWritable(fds, sizeof(struct pollfd) * nfds);
                                }
                                uint64_t Result = ::poll(fds, nfds, timeout);
                                SYSCALL_ERRNO();
                              });

  REGISTER_SYSCALL_IMPL_FLAGS(open, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
                              [](FEXCore::Core::CpuStateFrame* Frame, const char* pathname, int flags, uint32_t mode) -> uint64_t {
                                flags = FEX::HLE::RemapFromX86Flags(flags);
                                uint64_t Result = FEX::HLE::_SyscallHandler->FM.Open(pathname, flags, mode);
                                SYSCALL_ERRNO();
                              });

  REGISTER_SYSCALL_IMPL_FLAGS(close, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
                              [](FEXCore::Core::CpuStateFrame* Frame, int fd) -> uint64_t {
                                uint64_t Result = FEX::HLE::_SyscallHandler->FM.Close(fd);
                                SYSCALL_ERRNO();
                              });

  REGISTER_SYSCALL_IMPL_FLAGS(chown, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
                              [](FEXCore::Core::CpuStateFrame* Frame, const char* pathname, uid_t owner, gid_t group) -> uint64_t {
                                uint64_t Result = ::chown(pathname, owner, group);
                                SYSCALL_ERRNO();
                              });

  REGISTER_SYSCALL_IMPL_FLAGS(lchown, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
                              [](FEXCore::Core::CpuStateFrame* Frame, const char* pathname, uid_t owner, gid_t group) -> uint64_t {
                                uint64_t Result = ::lchown(pathname, owner, group);
                                SYSCALL_ERRNO();
                              });

  REGISTER_SYSCALL_IMPL_FLAGS(access, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
                              [](FEXCore::Core::CpuStateFrame* Frame, const char* pathname, int mode) -> uint64_t {
                                uint64_t Result = FEX::HLE::_SyscallHandler->FM.Access(pathname, mode);
                                SYSCALL_ERRNO();
                              });

  REGISTER_SYSCALL_IMPL_FLAGS(pipe, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
                              [](FEXCore::Core::CpuStateFrame* Frame, int pipefd[2]) -> uint64_t {
                                uint64_t Result = ::pipe(pipefd);
                                SYSCALL_ERRNO();
                              });

  REGISTER_SYSCALL_IMPL_FLAGS(dup3, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
                              [](FEXCore::Core::CpuStateFrame* Frame, int oldfd, int newfd, int flags) -> uint64_t {
                                flags = FEX::HLE::RemapFromX86Flags(flags);
                                uint64_t Result = ::dup3(oldfd, newfd, flags);
                                SYSCALL_ERRNO();
                              });

  REGISTER_SYSCALL_IMPL_FLAGS(inotify_init, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
                              [](FEXCore::Core::CpuStateFrame* Frame) -> uint64_t {
                                uint64_t Result = ::inotify_init();
                                SYSCALL_ERRNO();
                              });

  REGISTER_SYSCALL_IMPL_FLAGS(openat, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
                              [](FEXCore::Core::CpuStateFrame* Frame, int dirfs, const char* pathname, int flags, uint32_t mode) -> uint64_t {
                                flags = FEX::HLE::RemapFromX86Flags(flags);
                                uint64_t Result = FEX::HLE::_SyscallHandler->FM.Openat(dirfs, pathname, flags, mode);
                                SYSCALL_ERRNO();
                              });

  REGISTER_SYSCALL_IMPL_FLAGS(readlinkat, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
                              [](FEXCore::Core::CpuStateFrame* Frame, int dirfd, const char* pathname, char* buf, size_t bufsiz) -> uint64_t {
                                uint64_t Result = FEX::HLE::_SyscallHandler->FM.Readlinkat(dirfd, pathname, buf, bufsiz);
                                SYSCALL_ERRNO();
                              });

  REGISTER_SYSCALL_IMPL_FLAGS(faccessat, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
                              [](FEXCore::Core::CpuStateFrame* Frame, int dirfd, const char* pathname, int mode) -> uint64_t {
                                uint64_t Result = FEX::HLE::_SyscallHandler->FM.FAccessat(dirfd, pathname, mode);
                                SYSCALL_ERRNO();
                              });

  if (Handler->IsHostKernelVersionAtLeast(5, 8, 0)) {
    // Only exists on kernel 5.8+
    REGISTER_SYSCALL_IMPL_FLAGS(faccessat2, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
                                [](FEXCore::Core::CpuStateFrame* Frame, int dirfd, const char* pathname, int mode, int flags) -> uint64_t {
                                  uint64_t Result = FEX::HLE::_SyscallHandler->FM.FAccessat2(dirfd, pathname, mode, flags);
                                  SYSCALL_ERRNO();
                                });

    REGISTER_SYSCALL_IMPL_FLAGS(
      openat2, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
      [](FEXCore::Core::CpuStateFrame* Frame, int dirfs, const char* pathname, struct open_how* how, size_t usize) -> uint64_t {
        open_how HostHow {};
        size_t HostSize = std::min(sizeof(open_how), usize);
        memcpy(&HostHow, how, HostSize);

        HostHow.flags = FEX::HLE::RemapFromX86Flags(HostHow.flags);
        uint64_t Result = FEX::HLE::_SyscallHandler->FM.Openat2(dirfs, pathname, &HostHow, HostSize);
        SYSCALL_ERRNO();
      });
  } else {
    REGISTER_SYSCALL_IMPL(faccessat2, UnimplementedSyscallSafe);
    REGISTER_SYSCALL_IMPL(openat2, UnimplementedSyscallSafe);
  }

  REGISTER_SYSCALL_IMPL_FLAGS(eventfd, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
                              [](FEXCore::Core::CpuStateFrame* Frame, uint32_t count) -> uint64_t {
                                uint64_t Result = ::syscall(SYSCALL_DEF(eventfd2), count, 0);
                                SYSCALL_ERRNO();
                              });

  REGISTER_SYSCALL_IMPL_FLAGS(pipe2, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
                              [](FEXCore::Core::CpuStateFrame* Frame, int pipefd[2], int flags) -> uint64_t {
                                flags = FEX::HLE::RemapFromX86Flags(flags);
                                uint64_t Result = ::pipe2(pipefd, flags);
                                SYSCALL_ERRNO();
                              });

  REGISTER_SYSCALL_IMPL_FLAGS(
    statx, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
    [](FEXCore::Core::CpuStateFrame* Frame, int dirfd, const char* pathname, int flags, uint32_t mask, struct statx* statxbuf) -> uint64_t {
      // Flags don't need remapped
      uint64_t Result = FEX::HLE::_SyscallHandler->FM.Statx(dirfd, pathname, flags, mask, statxbuf);
      SYSCALL_ERRNO();
    });

  if (Handler->IsHostKernelVersionAtLeast(5, 9, 0)) {
    REGISTER_SYSCALL_IMPL_FLAGS(close_range, SyscallFlags::OPTIMIZETHROUGH | SyscallFlags::NOSYNCSTATEONENTRY,
                                [](FEXCore::Core::CpuStateFrame* Frame, unsigned int first, unsigned int last, unsigned int flags) -> uint64_t {
                                  uint64_t Result = FEX::HLE::_SyscallHandler->FM.CloseRange(first, last, flags);
                                  SYSCALL_ERRNO();
                                });
  } else {
    REGISTER_SYSCALL_IMPL(close_range, UnimplementedSyscallSafe);
  }
}
} // namespace FEX::HLE