# =============================================================================
# Makefile — rsbl (UEFI bootloader for RNG)
#
# Produces build/bootloader/BOOTX64.EFI (PE32+ for UEFI)
#
# Uses -fPIE for position-independent code so the image works at any
# load address.  The Optiplex 7010 firmware ignores ImageBase + relocs,
# so RELOCS_STRIPPED + padding to ~160KB is required.
# =============================================================================

BUILD_DIR  = ../build/bootloader
CC         = gcc
LD         = ld
OBJCOPY    = objcopy

CFLAGS = -m64 -ffreestanding -nostdinc -nostartfiles -nodefaultlibs   \
         -fno-builtin -fno-stack-protector -fPIE -fPIC                \
         -fshort-wchar -mno-red-zone -mabi=ms -Qn                    \
         -fno-asynchronous-unwind-tables -fno-unwind-tables           \
         -fno-exceptions                                               \
         -I. -Wall -Wextra -Werror

LDFLAGS = -m elf_x86_64 -nostdlib -z norelro --no-dynamic-linker      \
          -Ttext=0x1000 -e efi_main

.PHONY: all clean

all: $(BUILD_DIR)/BOOTX64.EFI

$(BUILD_DIR)/BOOTX64.EFI: main.elf
	@mkdir -p $(BUILD_DIR)
	$(OBJCOPY) -O pei-x86-64 --subsystem=10:1.1 \
	  --heap 0x100000,0x1000 \
	  --stack 0x100000,0x1000 \
	  $< $@
	python3 fix_pe_simple.py $@
	python3 pad_for_optiplex.py $@
	@echo "  -> $@"
	@ls -lh $@

main.elf: main.o
	$(LD) $(LDFLAGS) -o "$@" "$^"

main.o: main.c uefi.h
	$(CC) $(CFLAGS) -c -o "$@" "$<"

clean:
	rm -f *.o *.elf $(BUILD_DIR)/BOOTX64.EFI