From a53940c5636ca5e9a74db9242447de6f0d20dbed Mon Sep 17 00:00:00 2001
From: Jacob Lifshay <programmerjake@gmail.com>
Date: Tue, 12 Dec 2023 10:11:04 -0800
Subject: [PATCH] add make_gdb_vm_image.sh script, it doesn't work yet but
 could be useful

see https://bugs.libre-soc.org/show_bug.cgi?id=1228#c15
---
 .gitignore           |  1 +
 make_gdb_vm_image.sh | 98 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 99 insertions(+)
 create mode 100755 make_gdb_vm_image.sh

diff --git a/.gitignore b/.gitignore
index 6ce67a3b..cce157d9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,3 +13,4 @@ dist
 /crtl*
 /formal_test_temp
 /test-out/
+*.iso
diff --git a/make_gdb_vm_image.sh b/make_gdb_vm_image.sh
new file mode 100755
index 00000000..7df88420
--- /dev/null
+++ b/make_gdb_vm_image.sh
@@ -0,0 +1,98 @@
+#!/bin/bash
+# doesn't actually fully work yet...
+set -e
+if [[ "$(id -u)" != 0 ]]; then
+    exec sudo bash "$0" "$@"
+fi
+build_dir="$(mktemp -d)"
+iso_dir="$build_dir/iso"
+mounts=()
+function at_exit() {
+    set +e
+    for i in "${mounts[@]}"; do
+        umount "$i"
+    done
+    rm -rf --one-file-system "$build_dir"
+}
+trap at_exit EXIT
+mmdebstrap -v --variant=apt --include=grub-ieee1275-bin,xorriso,gdbserver,linux-image-powerpc64le --architecture=ppc64el bullseye "$build_dir"
+echo "gdb-vm-build" > "$build_dir"/etc/debian_chroot
+if [[ "$(arch)" != "ppc64le" ]]; then
+    cp /usr/bin/qemu-ppc64le-static "$build_dir"/usr/bin/qemu-ppc64le-static
+fi
+cp /etc/resolv.conf "$build_dir"/etc/resolv.conf
+mount --bind /dev "$build_dir"/dev
+mounts=("$build_dir"/dev "${mounts[@]}")
+mount --bind /dev/pts "$build_dir"/dev/pts
+mounts=("$build_dir"/dev/pts "${mounts[@]}")
+mount --bind /proc "$build_dir"/proc
+mounts=("$build_dir"/proc "${mounts[@]}")
+mount --bind /sys "$build_dir"/sys
+mounts=("$build_dir"/sys "${mounts[@]}")
+mkdir "$iso_dir"
+cat > "$build_dir"/etc/initramfs-tools/hooks/gdbserver <<'EOF'
+#!/bin/sh
+
+PREREQ=""
+prereqs()
+{
+    echo "$PREREQ"
+}
+
+case $1 in
+prereqs)
+    prereqs
+    exit 0
+    ;;
+esac
+
+. /usr/share/initramfs-tools/hook-functions
+
+echo copying gdbserver...
+copy_exec /usr/bin/gdbserver /usr/bin/gdbserver
+
+exit 0
+EOF
+chmod +x "$build_dir"/etc/initramfs-tools/hooks/gdbserver
+cat > "$build_dir"/etc/initramfs-tools/scripts/init-top/gdbserver <<'EOF'
+#!/bin/sh
+PREREQ=""
+
+prereqs()
+{
+    echo "$PREREQ"
+}
+
+case $1 in
+# get pre-requisites
+prereqs)
+    prereqs
+    exit 0
+    ;;
+esac
+
+# TODO: call gdbserver on serial port instead...then poweroff
+sh <>/dev/tty1 >&0 2>&0
+
+exit 0
+EOF
+chmod +x "$build_dir"/etc/initramfs-tools/scripts/init-top/gdbserver
+chroot "$build_dir" update-initramfs -k all -u
+cp "$build_dir"/boot/vmlinu?-* "$iso_dir"/vmlinux
+cp "$build_dir"/boot/initrd.img-* "$iso_dir"/initrd.gz
+mkdir -p "$iso_dir"/boot/grub
+cat > "$iso_dir"/boot/grub/grub.cfg <<'EOF'
+set timeout=0
+set default=0
+
+menuentry "boot" {
+    insmod gzio
+    # not a real UUID, just makes initrd work...
+    set root=(ieee1275/cdrom,apple3)
+    linux /vmlinux root=UUID=2942fbed-5e30-4bbd-b1ba-5ac1875bc41c debug
+    initrd /initrd.gz
+}
+EOF
+chroot "$build_dir" grub-mkrescue -o gdb-vm.iso /iso
+install -m 644 "$build_dir"/gdb-vm.iso gdb-vm.iso
+
-- 
2.30.2