feat(run): initial run script

run.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+# -x -> trace: print every command
+# -u -> exit if undefined variables are used
+# -e -> exit if an error occurs
+set -xue
+
+QEMU=qemu-system-riscv32
+
+# Compile
+CC=clang
+# -ffreestanding: do not use stdlib of the host environment
+# -fuse-ld=lld: LLVM linker
+# -fno-stack-protector: disable stack protection
+# -Wl,-Tkernel.ld: linker script
+# -Wl,-Map=kernel.map: output a map file (linker allocationr result)
+CFLAGS="-std=c11 -O2 -g3 -Wall -Wextra --target=riscv32-unknown-elf -fuse-ld=lld -fno-stack-protector -ffreestanding -nostdlib"
+
+$CC $CFLAGS -Wl,-Tkernel.ld -Wl,-Map=kernel.map -o kernel.elf \
+    src/kernel.c
+
+# Run QEMU
+# -machine virt: generic riscv platform
+# -bios default: load the default firmware (OpenSBI)
+# -nographic: disable VGA, everything on console
+# -serial mon:stdio: serial port is connected to terminal's stdin/stdout
+# --no-reboot: do not reboot if there's panic/shutdown/crash
+$QEMU -machine virt -bios default -nographic -serial mon:stdio --no-reboot \
+    -kernel kernel.elf
+
+# Press Ctrl+A and then C to enter QEMU debug console and quit with `q`