From e4c2b8a014d9bec2ecf12ae17182430086ad0328 Mon Sep 17 00:00:00 2001
From: Jeremi Piotrowski <jpiotrowski@microsoft.com>
Date: Tue, 9 Jul 2024 12:28:45 +0200
Subject: [PATCH] TMP #2

---
 common.sh   | 38 ++++++++++++++++++++++++++++++++++++++
 setup_board |  6 ++++++
 2 files changed, 44 insertions(+)

diff --git a/common.sh b/common.sh
index 0cff99ed56..3dbb8040dc 100644
--- a/common.sh
+++ b/common.sh
@@ -51,6 +51,9 @@ fi
 # Turn on bash debug support if available for backtraces.
 shopt -s extdebug 2>/dev/null
 
+# Source qemu library path
+. /etc/profile.d/qemu-aarch64.sh 2> /dev/null || true
+
 # Output a backtrace all the way back to the raw invocation, suppressing
 # only the _dump_trace frame itself.
 _dump_trace() {
@@ -989,3 +992,38 @@ BOAT
   echo -e "${V_VIDOFF}"
   die "$* failed"
 }
+
+# The binfmt_misc support in the kernel is required.
+# The aarch64 binaries should be executed through
+# "/usr/bin/qemu-aarch64-static"
+setup_qemu_static() {
+  local root_fs_dir="$1"
+  case "${BOARD}" in
+    amd64-usr) return 0;;
+    arm64-usr)
+      if [[ -f "${root_fs_dir}/sbin/ldconfig" ]]; then
+        sudo cp /usr/bin/qemu-aarch64 "${root_fs_dir}"/usr/bin/qemu-aarch64-static
+        echo export QEMU_LD_PREFIX=\"/build/arm64-usr/\" | sudo tee /etc/profile.d/qemu-aarch64.sh
+        . /etc/profile.d/qemu-aarch64.sh
+      else
+        die "Missing basic layout in target rootfs"
+      fi
+    ;;
+    *) die "Unsupported arch" ;;
+  esac
+}
+
+clean_qemu_static() {
+  local root_fs_dir="$1"
+  case "${BOARD}" in
+    amd64-usr) return 0;;
+    arm64-usr)
+      if [[ -f "${root_fs_dir}/usr/bin/qemu-aarch64-static" ]]; then
+        sudo rm "${root_fs_dir}"/usr/bin/qemu-aarch64-static
+      else
+        die "File not found"
+      fi
+    ;;
+    *) die "Unsupported arch" ;;
+  esac
+}
diff --git a/setup_board b/setup_board
index 70080ce1bd..6294fd8d68 100755
--- a/setup_board
+++ b/setup_board
@@ -367,6 +367,12 @@ if [[ ${FLAGS_regen_configs} -eq ${FLAGS_FALSE} ]]; then
       "${EMERGE_TOOLCHAIN_FLAGS[@]}" "${TOOLCHAIN_PKGS[@]}"
 fi
 
+if [[ ${FLAGS_regen_configs_only} -eq ${FLAGS_FALSE} ]]; then
+	:
+fi
+# Setup BOARD_ROOT for QEMU user emulation.
+setup_qemu_static "${BOARD_ROOT}"
+
 if [ $FLAGS_default -eq $FLAGS_TRUE ] ; then
   echo $BOARD_VARIANT > "$GCLIENT_ROOT/src/scripts/.default_board"
 fi