diff --git a/.github/.cspell/organization-dictionary.txt b/.github/.cspell/organization-dictionary.txt
index d7546a2..7244875 100644
--- a/.github/.cspell/organization-dictionary.txt
+++ b/.github/.cspell/organization-dictionary.txt
@@ -151,6 +151,7 @@ endianness
 esac
 euxo
 gsub
+libc
 moreutils
 msys
 noninteractive
diff --git a/.github/.cspell/project-dictionary.txt b/.github/.cspell/project-dictionary.txt
index dcbdfa3..27ce2fc 100644
--- a/.github/.cspell/project-dictionary.txt
+++ b/.github/.cspell/project-dictionary.txt
@@ -5,7 +5,6 @@ CXXSTDLIB
 devel
 endgroup
 haswell
-libc
 libclang
 libstdc
 Loongson
@@ -19,5 +18,6 @@ WINEBOOT
 winehq
 WINEPATH
 WINEPREFIX
+wineserver
 Zbuild
 Zdoctest
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1456243..1a8ccea 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,6 @@ env:
   CARGO_NET_GIT_FETCH_WITH_CLI: true
   CARGO_NET_RETRY: 10
   CARGO_TERM_COLOR: always
-  QEMU_STRACE: 1
   RUST_BACKTRACE: 1
   RUSTDOCFLAGS: -D warnings
   RUSTFLAGS: -D warnings
@@ -184,7 +183,7 @@ jobs:
           # - { target: thumbv7a-pc-windows-msvc, os: windows-latest } # tier3
           - { target: x86_64-pc-windows-msvc, os: windows-latest }
 
-          # Windows (GNU)
+          # Windows (MinGW)
           # rustup target list | grep -e '-pc-windows-gnu'
           # rustc --print target-list | grep -e '-pc-windows-gnu'
           # Windows host:
@@ -194,13 +193,13 @@ jobs:
             os: windows-latest
           # Linux host:
           # - target: i686-pc-windows-gnu
-          #   os: ubuntu-22.04
           - target: x86_64-pc-windows-gnu
-            os: ubuntu-22.04
           - target: x86_64-pc-windows-gnu
             runner: wine@7.13
           - target: x86_64-pc-windows-gnu
             runner: wine@7.0.1
+          - target: x86_64-pc-windows-gnullvm
+          - target: aarch64-pc-windows-gnullvm
         # prettier-ignore
         exclude:
           # Segmentation fault on ubuntu 20.04: https://github.com/taiki-e/setup-cross-toolchain-action/issues/1
@@ -220,6 +219,8 @@ jobs:
           persist-credentials: false
       - name: Install Rust
         run: rustup toolchain add nightly --no-self-update && rustup default nightly
+      - run: echo "QEMU_STRACE=1" >>"${GITHUB_ENV}"
+        if: matrix.target != 'aarch64-pc-windows-gnullvm'
       - uses: ./
         with:
           target: ${{ matrix.target }}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 955e946..df7ad4a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,13 @@ Note: In this file, do not use the hard wrap in the middle of a sentence for com
 
 ## [Unreleased]
 
+- Support windows-gnullvm targets on Linux host.
+
+  - aarch64-pc-windows-gnullvm
+  - x86_64-pc-windows-gnullvm
+
+  Running tests is supported on both targets.
+
 ## [1.14.0] - 2023-07-28
 
 - Support Windows targets on Windows host.
diff --git a/README.md b/README.md
index 6bbcc90..c929380 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,8 @@ GitHub Action for setup toolchains for cross compilation and cross testing for R
   - [FreeBSD](#freebsd)
   - [NetBSD](#netbsd)
   - [WASI](#wasi)
-  - [Windows (GNU)](#windows-gnu)
+  - [Windows (MinGW)](#windows-mingw)
+  - [Windows (LLVM MinGW)](#windows-llvm-mingw)
   - [Windows (MSVC)](#windows-msvc)
   - [macOS](#macos)
 - [Related Projects](#related-projects)
@@ -367,23 +368,21 @@ Only specifying a major version is supported.
 
 ### WASI
 
-| C++ | test |
-| --- | ---- |
-| ? (libc++) | ✓ |
+| libc | Clang | C++ | test |
+| ---- | ----- | --- | ---- |
+| wasi-sdk 20 (wasi-libc 1dfe5c3) | 16.0.0 | ? (libc++) | ✓ |
+
+<!--
+clang version and wasi-libc hash can be found here: https://github.com/taiki-e/rust-cross-toolchain#wasi
+-->
 
 **Supported targets**:
 
 | target | host | runner | note |
 | ------ | ---- | ------ | ---- |
-| `wasm32-wasi` | x86_64 Linux [1] | wasmtime |  |
-
-<!--
-clang version and wasi-libc hash can be found here: https://github.com/WebAssembly/wasi-sdk/tree/wasi-sdk-16/src
--->
+| `wasm32-wasi` | x86_64 Linux | wasmtime |  |
 
-[1] clang 14, wasi-sdk 16 (wasi-libc 30094b6)<br>
-
-### Windows (GNU)
+### Windows (MinGW)
 
 | C++ | test |
 | --- | ---- |
@@ -413,6 +412,19 @@ You can select/pin the version by using `@` syntax in `runner` input option. For
     runner: wine@7.13
 ```
 
+### Windows (LLVM MinGW)
+
+| libc | Clang | C++ | test |
+| ---- | ----- | --- | ---- |
+| Mingw-w64 b190082 | 16.0.6 | ✓ (libc++) | ✓ |
+
+**Supported targets**:
+
+| target | host | runner | note |
+| ------ | ---- | ------ | ---- |
+| `aarch64-pc-windows-gnullvm` | Ubuntu (22.04) | wine |  |
+| `x86_64-pc-windows-gnullvm` | Ubuntu (22.04) | wine |  |
+
 ### Windows (MSVC)
 
 | C++ | test |
diff --git a/main.sh b/main.sh
index 4e23dd1..4949473 100755
--- a/main.sh
+++ b/main.sh
@@ -110,6 +110,12 @@ install_rust_cross_toolchain() {
     retry docker create --name rust-cross-toolchain "ghcr.io/taiki-e/rust-cross-toolchain:${target}${sys_version:-}-dev-amd64"
     mkdir -p .setup-cross-toolchain-action-tmp
     docker cp "rust-cross-toolchain:/${target}" .setup-cross-toolchain-action-tmp/toolchain
+    case "${target}" in
+        aarch64-pc-windows-gnullvm)
+            docker cp "rust-cross-toolchain:/opt/wine-arm64" .setup-cross-toolchain-action-tmp/wine-arm64
+            sudo cp -r .setup-cross-toolchain-action-tmp/wine-arm64 /opt/wine-arm64
+            ;;
+    esac
     docker rm -f rust-cross-toolchain >/dev/null
     sudo cp -r .setup-cross-toolchain-action-tmp/toolchain/. "${toolchain_dir}"/
     rm -rf ./.setup-cross-toolchain-action-tmp
@@ -235,8 +241,9 @@ register_binfmt() {
             local magic='MZ'
             local mask=''
             ;;
-        *) bail "internal error: unrecognized register_binfmt arg" ;;
+        *) bail "internal error: unrecognized register_binfmt argument '$1'" ;;
     esac
+    echo "Setting ${runner_path} as binfmt interpreter for ${target}"
     echo ":${target}:M::${magic}:${mask}:${runner_path}:F" \
         | sudo tee /proc/sys/fs/binfmt_misc/register >/dev/null
     echo "::endgroup::"
@@ -381,82 +388,112 @@ EOF
                 runner_path="${toolchain_dir}/bin/${target}-runner"
                 register_binfmt wasmtime
                 ;;
-            x86_64-pc-windows-gnu)
+            x86_64-pc-windows-gnu | x86_64-pc-windows-gnullvm | aarch64-pc-windows-gnullvm)
                 arch="${target%%-*}"
-                apt_target="${arch}-w64-mingw32"
-                apt_packages+=("g++-mingw-w64-${arch/_/-}")
-                sysroot_dir="/usr/${apt_target}"
+                case "${target}" in
+                    *-gnullvm*) install_rust_cross_toolchain ;;
+                    *)
+                        apt_target="${arch}-w64-mingw32"
+                        apt_packages+=("g++-mingw-w64-${arch/_/-}")
+                        sysroot_dir="/usr/${apt_target}"
+                        cat >>"${GITHUB_ENV}" <<EOF
+CARGO_TARGET_${target_upper}_RUNNER=${target}-runner
+CARGO_TARGET_${target_upper}_LINKER=${apt_target}-gcc-posix
+CC_${target_lower}=${apt_target}-gcc-posix
+CXX_${target_lower}=${apt_target}-g++-posix
+AR_${target_lower}=${apt_target}-ar
+RANLIB_${target_lower}=${apt_target}-ranlib
+STRIP=${apt_target}-strip
+OBJDUMP=${apt_target}-objdump
+EOF
+                        ;;
+                esac
 
-                # https://wiki.winehq.org/Ubuntu
-                # https://wiki.winehq.org/Wine_User%27s_Guide#Wine_from_WineHQ
-                sudo dpkg --add-architecture i386
-                codename="$(grep '^VERSION_CODENAME=' /etc/os-release | sed 's/^VERSION_CODENAME=//')"
-                sudo mkdir -pm755 /etc/apt/keyrings
-                retry sudo wget -O /etc/apt/keyrings/winehq-archive.key https://dl.winehq.org/wine-builds/winehq.key
-                retry sudo wget -NP /etc/apt/sources.list.d/ "https://dl.winehq.org/wine-builds/ubuntu/dists/${codename}/winehq-${codename}.sources"
-                case "${runner}" in
-                    '')
-                        # Use winehq-devel 7.13 as default because mio/wepoll needs wine 7.13+.
-                        # https://github.com/tokio-rs/mio/issues/1444
-                        wine_version=7.13
-                        wine_branch=devel
+                case "${target}" in
+                    aarch64*)
+                        wine_root=/opt/wine-arm64
+                        wine_exe="${wine_root}"/bin/wine
+                        qemu_arch=aarch64
+                        case "${runner}" in
+                            '' | wine) ;;
+                            wine@*) bail "specifying wine version for aarch64 windows is not yet supported" ;;
+                            *) bail "unrecognized runner '${runner}'" ;;
+                        esac
+                        sudo cp "${wine_root}"/lib/ld-linux-aarch64.so.1 /lib/
+                        x "qemu-${qemu_arch}" --version
+                        x "${wine_exe}" --version
+                        wineboot="${wine_root}/bin/wineserver"
                         ;;
-                    wine@*)
-                        wine_version="${runner#*@}"
-                        if [[ "${wine_version}" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
-                            wine_branch=stable
-                        elif [[ "${wine_version}" =~ ^[0-9]+\.[0-9]+$ ]]; then
-                            wine_branch=devel
-                        else
-                            bail "unrecognized runner '${runner}'"
-                        fi
+                    x86_64*)
+                        wine_exe=wine
+                        # https://wiki.winehq.org/Ubuntu
+                        # https://wiki.winehq.org/Wine_User%27s_Guide#Wine_from_WineHQ
+                        sudo dpkg --add-architecture i386
+                        codename="$(grep '^VERSION_CODENAME=' /etc/os-release | sed 's/^VERSION_CODENAME=//')"
+                        sudo mkdir -pm755 /etc/apt/keyrings
+                        retry sudo wget -O /etc/apt/keyrings/winehq-archive.key https://dl.winehq.org/wine-builds/winehq.key
+                        retry sudo wget -NP /etc/apt/sources.list.d/ "https://dl.winehq.org/wine-builds/ubuntu/dists/${codename}/winehq-${codename}.sources"
+                        case "${runner}" in
+                            '' | wine)
+                                # Use winehq-devel 7.13 as default because mio/wepoll needs wine 7.13+.
+                                # https://github.com/tokio-rs/mio/issues/1444
+                                wine_version=7.13
+                                wine_branch=devel
+                                ;;
+                            wine@*)
+                                wine_version="${runner#*@}"
+                                if [[ "${wine_version}" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
+                                    wine_branch=stable
+                                elif [[ "${wine_version}" =~ ^[0-9]+\.[0-9]+$ ]]; then
+                                    wine_branch=devel
+                                else
+                                    bail "unrecognized runner '${runner}'"
+                                fi
+                                ;;
+                            *) bail "unrecognized runner '${runner}'" ;;
+                        esac
+                        # The suffix is 1 in most cases, rarely 2.
+                        # https://dl.winehq.org/wine-builds/ubuntu/dists/jammy/main/binary-amd64
+                        # https://dl.winehq.org/wine-builds/ubuntu/dists/focal/main/binary-amd64
+                        wine_build_suffix=1
+                        apt_packages+=(
+                            "winehq-${wine_branch}=${wine_version}~${codename}-${wine_build_suffix}"
+                            "wine-${wine_branch}=${wine_version}~${codename}-${wine_build_suffix}"
+                            "wine-${wine_branch}-amd64=${wine_version}~${codename}-${wine_build_suffix}"
+                            "wine-${wine_branch}-i386=${wine_version}~${codename}-${wine_build_suffix}"
+                            "wine-${wine_branch}-dev=${wine_version}~${codename}-${wine_build_suffix}"
+                        )
+                        install_apt_packages
+                        x wine --version
+                        wineboot=wineboot
+                        ;;
+                    *) bail "internal error: unrecognized target '${target}'" ;;
+                esac
+                case "${target}" in
+                    *-gnullvm*) winepath="${toolchain_dir}/${target}/bin" ;;
+                    *)
+                        gcc_lib="$(basename "$(ls -d "/usr/lib/gcc/${apt_target}"/*posix)")"
+                        winepath="/usr/lib/gcc/${apt_target}/${gcc_lib};/usr/${apt_target}/lib"
                         ;;
-                    *) bail "unrecognized runner '${runner}'" ;;
                 esac
-                # The suffix is 1 in most cases, rarely 2.
-                # https://dl.winehq.org/wine-builds/ubuntu/dists/jammy/main/binary-amd64
-                # https://dl.winehq.org/wine-builds/ubuntu/dists/focal/main/binary-amd64
-                wine_build_suffix=1
-                apt_packages+=(
-                    "winehq-${wine_branch}=${wine_version}~${codename}-${wine_build_suffix}"
-                    "wine-${wine_branch}=${wine_version}~${codename}-${wine_build_suffix}"
-                    "wine-${wine_branch}-amd64=${wine_version}~${codename}-${wine_build_suffix}"
-                    "wine-${wine_branch}-i386=${wine_version}~${codename}-${wine_build_suffix}"
-                    "wine-${wine_branch}-dev=${wine_version}~${codename}-${wine_build_suffix}"
-                )
-                install_apt_packages
-                x wine --version
-
-                gcc_lib="$(basename "$(ls -d "/usr/lib/gcc/${apt_target}"/*posix)")"
-                # Adapted from https://github.com/cross-rs/cross/blob/16a64e7028d90a3fdf285cfd642cdde9443c0645/docker/windows-entry.sh
                 runner_path="/usr/local/bin/${target}-runner"
-                cat >"${runner_path}" <<EOF
+                cat >".${target}-runner.tmp" <<EOF
 #!/bin/sh
 set -eu
 export HOME=/tmp/home
-mkdir -p "\${HOME}"
+mkdir -p "\${HOME}"/.wine
 export WINEPREFIX=/tmp/wine
 mkdir -p "\${WINEPREFIX}"
 if [ ! -e /tmp/WINEBOOT ]; then
-    wineboot &>/dev/null
+    ${wineboot} &>/dev/null
     touch /tmp/WINEBOOT
 fi
-export WINEPATH="/usr/lib/gcc/${apt_target}/${gcc_lib};/usr/${apt_target}/lib;\${WINEPATH:-}"
-exec wine "\$@"
+export WINEPATH="${winepath};\${WINEPATH:-}"
+exec ${wine_exe} "\$@"
 EOF
-                chmod +x "${runner_path}"
+                chmod +x ".${target}-runner.tmp"
+                sudo mv ".${target}-runner.tmp" "${runner_path}"
                 register_binfmt wine
-
-                cat >>"${GITHUB_ENV}" <<EOF
-CARGO_TARGET_${target_upper}_RUNNER=${target}-runner
-CARGO_TARGET_${target_upper}_LINKER=${apt_target}-gcc-posix
-CC_${target_lower}=${apt_target}-gcc-posix
-CXX_${target_lower}=${apt_target}-g++-posix
-AR_${target_lower}=${apt_target}-ar
-RANLIB_${target_lower}=${apt_target}-ranlib
-STRIP=${apt_target}-strip
-OBJDUMP=${apt_target}-objdump
-EOF
                 ;;
             *) bail "target '${target}' is not supported yet on Linux host" ;;
         esac
diff --git a/tools/ci/test.sh b/tools/ci/test.sh
index 61b7ef3..0b23408 100755
--- a/tools/ci/test.sh
+++ b/tools/ci/test.sh
@@ -26,7 +26,7 @@ esac
 skip_run() {
     case "${target}" in
         # x86_64h-apple-darwin is also x86_64 but build-only due to the CPU of GitHub-provided macOS runners is older than haswell.
-        *-freebsd* | *-netbsd* | x86_64h-apple-darwin | aarch64*-darwin* | aarch64*-windows*) return 0 ;;
+        *-freebsd* | *-netbsd* | x86_64h-apple-darwin | aarch64*-darwin* | aarch64*-windows-msvc) return 0 ;;
         *) return 1 ;;
     esac
 }