Replace Makefile

Makefile

@@ -1,11 +1,129 @@
-OVMF = /usr/share/qemu/bios-TianoCoreEFI.bin
+# detect architecture
+MYARCH = $(shell uname -m | sed s,i[3456789]86,ia32,)
+ifeq ($(ARCH),)
+ARCH = $(MYARCH)
+endif
 
-all: $(wildcard examples/*)
+# get source files, generate object names
+ifeq ($(SRCS),)
+SRCS = $(wildcard *.c) $(wildcard *.S)
+endif
+ifeq ($(OBJS),)
+TMP = $(SRCS:.c=.o)
+OBJS = $(TMP:.S=.o)
+endif
+ifneq ($(OUTDIR),)
+# OUTDIR is not used with uefi/*.o deliberately
+OUTDIR:=$(addsuffix /,$(OUTDIR))
+endif
+CFLAGS += -fshort-wchar -fno-strict-aliasing -ffreestanding -fno-stack-protector -fno-stack-check -I. -I./uefi \
+  -I/usr/include -I/usr/include/efi -I/usr/include/efi/protocol -I/usr/include/efi/$(ARCH) -D__$(ARCH)__
+ifeq ($(ARCH),x86_64)
+CFLAGS += -DHAVE_USE_MS_ABI -mno-red-zone
+endif
 
-.PHONY: Makefile
+# for libuefi.a
+LIBSRCS = $(filter-out $(wildcard crt_*.c),$(wildcard *.c)) $(wildcard *.S)
+TMP2 = $(LIBSRCS:.c=.o)
+LIBOBJS = $(TMP2:.S=.o)
 
-%: Makefile
-	@test -f $@/Makefile && make -C $@ all 2>/dev/null
+# detect toolchain
+ifeq ($(wildcard /usr/bin/clang)$(wildcard /usr/local/bin/clang)$(wildcard /usr/lib/llvm/*/bin/clang),)
+USE_GCC = 1
+endif
+ifneq ($(USE_GCC),)
+ifeq ($(ARCH),x86_64)
+CFLAGS += -maccumulate-outgoing-args
+endif
+CFLAGS += -Wno-builtin-declaration-mismatch -fpic -fPIC
+LDFLAGS += -nostdlib -shared -Bsymbolic -Luefi uefi/crt_$(ARCH).o
+LIBS += -o $(addprefix $(OUTDIR),$(TARGET).so) -luefi -T uefi/elf_$(ARCH)_efi.lds
+# see if we're cross-compiling
+ifneq ($(ARCH),$(MYARCH))
+CC = $(ARCH)-elf-gcc
+LD = $(ARCH)-elf-ld
+OBJCOPY ?= $(ARCH)-elf-objcopy
+else
+CC = gcc
+LD = ld
+OBJCOPY ?= objcopy
+endif
+ifeq ($(ARCH),aarch64)
+EFIARCH = pei-aarch64-little
+else
+EFIARCH = efi-app-$(ARCH)
+endif
+AR ?= ar
+else
+CFLAGS += --target=$(ARCH)-pc-win32-coff -Wno-builtin-requires-header -Wno-incompatible-library-redeclaration -Wno-long-long
+LDFLAGS += -subsystem:efi_application -nodefaultlib -dll -entry:uefi_init uefi/*.o
+LIBS = -out:$(addprefix $(OUTDIR),$(TARGET))
+CC = clang
+LD = lld -flavor link
+OBJCOPY = true
+endif
 
-test:
-	qemu-system-x86_64 -sdl -bios $(OVMF) -m 64 -enable-kvm -hda fat:rw:examples
+# recipies
+ifeq ($(wildcard uefi/Makefile),)
+ALLTARGETS = crt_$(ARCH).o libuefi.a buildlib
+else
+ALLTARGETS = uefi/crt_$(ARCH).o uefi/libuefi.a $(OBJS) $(TARGET)
+endif
+
+all: $(OUTDIR) $(EXTRA) $(ALLTARGETS) $(ALSO)
+
+ifneq ($(OUTDIR),)
+$(OUTDIR):
+	mkdir -p $(OUTDIR)
+endif
+
+uefi/libuefi.a:
+	make --no-print-directory -C uefi libuefi.a USE_GCC=$(USE_GCC) ARCH=$(ARCH)
+
+libuefi.lib: $(LIBOBJS)
+
+libuefi.a: $(LIBOBJS)
+ifneq ($(USE_GCC),)
+	rm $@ 2>/dev/null || true
+	$(AR) -frsv $@ $(LIBOBJS) >/dev/null
+else
+	true
+endif
+
+$(TARGET): $(addprefix $(OUTDIR),$(TARGET).so)
+ifneq ($(USE_GCC),)
+	$(OBJCOPY) -j .text -j .sdata -j .data -j .dynamic -j .dynsym  -j .rel -j .rela -j .rel.* -j .rela.* -j .reloc --target $(EFIARCH) --subsystem=10 $^ $(addprefix $(OUTDIR),$@) || echo target: $(EFIARCH)
+	rm $(addprefix $(OUTDIR),$(TARGET).so)
+endif
+
+$(addprefix $(OUTDIR),$(TARGET).so): $(addprefix $(OUTDIR),$(OBJS)) $(EXTRA)
+	$(LD) $(LDFLAGS) $^ $(LIBS)
+	rm $(addprefix $(OUTDIR),*.lib) 2>/dev/null || true
+
+uefi/%.o: uefi/%.c
+	$(CC) $(CFLAGS) -c $< -o $@
+
+%.o: %.c
+	$(CC) $(CFLAGS) -c $< -o $(addprefix $(OUTDIR),$@)
+
+%.o: %.S
+	$(CC) $(CFLAGS) -c $< -o $(addprefix $(OUTDIR),$@)
+
+buildlib:
+	mkdir ../build ../build/uefi 2>/dev/null || true
+	cp crt_$(ARCH).o ../build/uefi/crt0.o
+	cp elf_$(ARCH)_efi.lds ../build/uefi/link.ld
+	cp libuefi.a uefi.h ../build/uefi
+
+clean:
+	rm $(addprefix $(OUTDIR),$(TARGET)) *.o *.a *.lib *.elf $(LIBOBJS) 2>/dev/null || true
+ifneq ($(OUTDIR),)
+	rm -rf $(OUTDIR)
+endif
+
+distclean: clean
+ifeq ($(wildcard uefi/Makefile),)
+	rm -rf ../build 2>/dev/null || true
+else
+	rm uefi/*.o uefi/libuefi.a 2>/dev/null || true
+endif