feat: code generation

Makefile

@@ -1,3 +1,12 @@
+ifneq (,$(wildcard ./.env))
+  include .env
+  export
+else
+  $(warning .env file not found, loading defaults)
+  include .env.example
+  export
+endif
+
 RISCV_CC ?= riscv64-unknown-elf-gcc
 RISCV_ARCH_FLAGS ?= -march=rv32im -mabi=ilp32
 HOST_CC ?= gcc
@@ -8,6 +17,8 @@ EMU_SRC_FILES := $(wildcard src/emulated/*.c)
 EMU_OBJ_FILES := $(EMU_SRC_FILES:src/emulated/%.c=build/%.riscv.o)
 EMU_OBJ := build/emulated.riscv.elf
 
+GENERATED := build/include/generated.h
+
 HOST_SRC := src/main.c src/elf.c
 
 ifeq ($(OS),Windows_NT)
@@ -34,12 +45,20 @@ host: $(HOST_EXE)
 $(HOST_EXE): $(HOST_SRC) tinyriscv/src/tinyriscv.h src/config.h src/elf.h | build
 	$(HOST_CC) $(HOST_CFLAGS) $(HOST_LDFLAGS) -I src -I tinyriscv/src $(HOST_SRC) -o $@
 
-build/%.riscv.o: src/emulated/%.c | build
-	$(RISCV_CC) $(RISCV_ARCH_FLAGS) -c $< -o $@
+build/%.riscv.o: src/emulated/%.c $(GENERATED) | build
+	$(RISCV_CC) $(RISCV_ARCH_FLAGS) -I $(dir $(GENERATED)) -I src/emulated -c $< -o $@
 
 $(EMU_OBJ): $(EMU_OBJ_FILES) | build
 	$(RISCV_CC) $(RISCV_ARCH_FLAGS) -nostdlib -Wl,-e,entry -Wl,-Ttext=0 $(EMU_OBJ_FILES) -o $@
 
+
+.FORCE:
+
+$(GENERATED): .FORCE
+	mkdir -p $(dir $@)
+	python codegen/generate.py $(FLAG_PREFIX) $(FLAG_LEN) > $@
+
+
 build:
 	mkdir -p $@