bin: Add helpers for gdb and qemu for RISC-V

There are now two scripts that can be used in order to quickly test a
locally built Linux kernel which has been cross compiled for the RISC-V
architecture.

Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>

2 files changed, 115 insertions, 0 deletions

diff --git a/bin/run-riscv-gdb.sh b/bin/run-riscv-gdb.sh
new file mode 100755
index 0000000..6efad17
--- /dev/null
+++ b/bin/run-riscv-gdb.sh
@@ -0,0 +1,54 @@
+#!/usr/bin/env sh
+
+set -e
+
+TUI=""
+BASE=${BASE:-~/src/git.kernel.org/linux/kernel}
+PROFILE=${PROFILE:-riscv}
+REPO=${REPO:-riscv}
+VMLINUX=${VMLINUX:-$BASE/$REPO/vmlinux}
+
+while [[ $# -gt 0 ]]; do
+  case $1 in
+  -t | --tui)
+    TUI="-tui"
+    shift
+    ;;
+  -h | --help)
+    SHOW_HELP=1
+    shift
+    ;;
+  -*)
+    echo "run-gdb (error): unknown option '$1'."
+    exit 1
+    ;;
+  *)
+    echo "run-gdb (warning): argument '$1' will be ignored."
+    shift # past argument
+    ;;
+  esac
+done
+
+# Print the show message if needed.
+if [ -n "$SHOW_HELP" ]; then
+  cat <<HERE
+usage: run-gdb.sh [OPTIONS]
+
+Start a connection to a running QEMU/KVM machine.
+
+  -h, --help            Show this message.
+  -t, --tui             Enable TUI mode.
+
+Environment variables that can be used the further configure GDB:
+
+  - BASE: the base kernel location. That is, the directory where kernel trees live. Default: "$BASE".
+  - PROFILE: the GDB profile from the default base kernel location. Default: "riscv".
+  - REPO: the Linux repository to be used. Default: "riscv".
+  - VMLINUX: path to 'vmlinux' so to load symbols. Default: "$VMLINUX".
+HERE
+  exit 0
+fi
+
+gdb $TUI \
+  --command $BASE/$PROFILE.gdb \
+  $VMLINUX
diff --git a/bin/run-riscv-qemu.sh b/bin/run-riscv-qemu.sh
new file mode 100755
index 0000000..6b9aaa9
--- /dev/null
+++ b/bin/run-riscv-qemu.sh
@@ -0,0 +1,61 @@
+#!/usr/bin/env sh
+
+set -e
+
+CORES=${CORES:-4}
+EXTRA=${EXTRA:-}
+REPO=${REPO:-riscv}
+KERNEL=${KERNEL:-~/src/git.kernel.org/linux/kernel/$REPO/arch/riscv/boot/Image}
+INITRD=${INITRD:-~/src/busybox/1.36.1/initramfs.cpio.gz}
+
+while [[ $# -gt 0 ]]; do
+    case $1 in
+    -g | --gdb)
+        EXTRA="-s -S"
+        shift
+        ;;
+    -h | --help)
+        SHOW_HELP=1
+        shift
+        ;;
+    -*)
+        echo "run-qemu (error): unknown option '$1'."
+        exit 1
+        ;;
+    *)
+        echo "run-qemu (warning): argument '$1' will be ignored."
+        shift # past argument
+        ;;
+    esac
+done
+
+# Print the show message if needed.
+if [ -n "$SHOW_HELP" ]; then
+    cat <<HERE
+usage: run-riscv-qemu.sh [OPTIONS]
+
+Run QEMU/KVM tailored to my needs for testing the Linux Kernel.
+
+  -g, --gdb             Wait for a GDB connection.
+  -h, --help            Show this message.
+
+Environment variables that can be used the further configure the run:
+
+  - CORES: number of cores (i.e. argument for '-smp'). Default: 4.
+  - EXTRA: extra arguments to pass. Default: (empty).
+  - INITRD: the initial ramdisk for the run (e.g. argument for '-initrd'). Default: "$INITRD".
+  - KERNEL: the kernel to be passed (i.e. argument for '-kernel'). Default: "$KERNEL".
+  - REPO: the Linux repository to be used. Default: "riscv".
+HERE
+    exit 0
+fi
+
+qemu-system-riscv64 -machine virt -nographic \
+    -smp "$CORES" \
+    -kernel "$KERNEL" \
+    -initrd "$INITRD" \
+    -append "root=/dev/ram" \
+    -append nokaslr \
+    -append ftrace_dump_on_oops \
+    -append sysctl.kernel.panic_on_rcu_stall=1 \
+    $EXTRA