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RaphProductions
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220
kernel/GNUmakefile
Executable file
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kernel/GNUmakefile
Executable file
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@ -0,0 +1,220 @@
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# Nuke built-in rules and variables.
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MAKEFLAGS += -rR
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.SUFFIXES:
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# This is the name that our final executable will have.
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# Change as needed.
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override OUTPUT := kernel
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# Target architecture to build for. Default to x86_64.
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ARCH := x86_64
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# Install prefix; /usr/local is a good, standard default pick.
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PREFIX := /usr/local
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# Check if the architecture is supported.
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ifeq ($(filter $(ARCH),aarch64 loongarch64 riscv64 x86_64),)
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$(error Architecture $(ARCH) not supported)
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endif
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# User controllable C compiler command.
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CC := cc
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# User controllable archiver command.
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AR := ar
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# User controllable C flags.
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CFLAGS := -g -O2 -pipe
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# User controllable C preprocessor flags. We set none by default.
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CPPFLAGS :=
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ifeq ($(ARCH),x86_64)
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# User controllable nasm flags.
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NASMFLAGS := -F dwarf -g
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endif
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# User controllable linker flags. We set none by default.
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LDFLAGS :=
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# Ensure the dependencies have been obtained.
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ifneq ($(shell ( test '$(MAKECMDGOALS)' = clean || test '$(MAKECMDGOALS)' = distclean ); echo $$?),0)
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ifeq ($(shell ( ! test -d freestnd-c-hdrs || ! test -d cc-runtime || ! test -f src/limine.h ); echo $$?),0)
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$(error Please run the ./get-deps script first)
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endif
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endif
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# Check if CC is Clang.
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override CC_IS_CLANG := $(shell ! $(CC) --version 2>/dev/null | grep 'clang' >/dev/null 2>&1; echo $$?)
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# Internal C flags that should not be changed by the user.
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override CFLAGS += \
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-Wall \
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-Wextra \
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-std=gnu11 \
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-nostdinc \
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-ffreestanding \
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-fno-stack-protector \
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-fno-stack-check \
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-fno-PIC \
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-ffunction-sections \
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-fdata-sections
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# Internal C preprocessor flags that should not be changed by the user.
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override CPPFLAGS := \
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-I src \
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-isystem freestnd-c-hdrs \
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$(CPPFLAGS) \
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-DLIMINE_API_REVISION=3 \
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-MMD \
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-MP
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ifeq ($(ARCH),x86_64)
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# Internal nasm flags that should not be changed by the user.
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override NASMFLAGS += \
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-Wall
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endif
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# Architecture specific internal flags.
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ifeq ($(ARCH),x86_64)
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ifeq ($(CC_IS_CLANG),1)
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override CC += \
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-target x86_64-unknown-none
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endif
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override CFLAGS += \
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-m64 \
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-march=x86-64 \
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-mno-80387 \
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-mno-mmx \
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-mno-sse \
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-mno-sse2 \
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-mno-red-zone \
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-mcmodel=kernel
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override LDFLAGS += \
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-Wl,-m,elf_x86_64
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override NASMFLAGS += \
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-f elf64
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endif
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ifeq ($(ARCH),aarch64)
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ifeq ($(CC_IS_CLANG),1)
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override CC += \
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-target aarch64-unknown-none
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endif
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override CFLAGS += \
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-mgeneral-regs-only
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override LDFLAGS += \
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-Wl,-m,aarch64elf
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endif
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ifeq ($(ARCH),riscv64)
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ifeq ($(CC_IS_CLANG),1)
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override CC += \
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-target riscv64-unknown-none
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override CFLAGS += \
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-march=rv64imac
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else
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override CFLAGS += \
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-march=rv64imac_zicsr_zifencei
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endif
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override CFLAGS += \
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-mabi=lp64 \
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-mno-relax
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override LDFLAGS += \
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-Wl,-m,elf64lriscv \
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-Wl,--no-relax
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endif
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ifeq ($(ARCH),loongarch64)
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ifeq ($(CC_IS_CLANG),1)
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override CC += \
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-target loongarch64-unknown-none
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endif
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override CFLAGS += \
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-march=loongarch64 \
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-mabi=lp64s
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override LDFLAGS += \
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-Wl,-m,elf64loongarch \
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-Wl,--no-relax
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endif
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# Internal linker flags that should not be changed by the user.
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override LDFLAGS += \
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-Wl,--build-id=none \
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-nostdlib \
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-static \
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-z max-page-size=0x1000 \
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-Wl,--gc-sections \
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-T linker-$(ARCH).ld
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# Use "find" to glob all *.c, *.S, and *.asm files in the tree and obtain the
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# object and header dependency file names.
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override SRCFILES := $(shell cd src && find -L * -type f | LC_ALL=C sort)
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override CFILES := $(filter %.c,$(SRCFILES))
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override ASFILES := $(filter %.S,$(SRCFILES))
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ifeq ($(ARCH),x86_64)
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override NASMFILES := $(filter %.asm,$(SRCFILES))
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endif
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override OBJ := $(addprefix obj-$(ARCH)/,$(CFILES:.c=.c.o) $(ASFILES:.S=.S.o))
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ifeq ($(ARCH),x86_64)
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override OBJ += $(addprefix obj-$(ARCH)/,$(NASMFILES:.asm=.asm.o))
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endif
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override HEADER_DEPS := $(addprefix obj-$(ARCH)/,$(CFILES:.c=.c.d) $(ASFILES:.S=.S.d))
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# Default target. This must come first, before header dependencies.
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.PHONY: all
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all: bin-$(ARCH)/$(OUTPUT)
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# Include header dependencies.
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-include $(HEADER_DEPS)
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# Link rules for building the C compiler runtime.
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cc-runtime-$(ARCH)/cc-runtime.a: GNUmakefile cc-runtime/*
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rm -rf cc-runtime-$(ARCH)
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cp -r cc-runtime cc-runtime-$(ARCH)
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$(MAKE) -C cc-runtime-$(ARCH) -f cc-runtime.mk \
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CC="$(CC)" \
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AR="$(AR)" \
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CFLAGS="$(CFLAGS)" \
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CPPFLAGS='-isystem ../freestnd-c-hdrs -DCC_RUNTIME_NO_FLOAT'
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# Link rules for the final executable.
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bin-$(ARCH)/$(OUTPUT): GNUmakefile linker-$(ARCH).ld $(OBJ) cc-runtime-$(ARCH)/cc-runtime.a
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mkdir -p "$$(dirname $@)"
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$(CC) $(CFLAGS) $(LDFLAGS) $(OBJ) cc-runtime-$(ARCH)/cc-runtime.a -o $@
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# Compilation rules for *.c files.
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obj-$(ARCH)/%.c.o: src/%.c GNUmakefile
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mkdir -p "$$(dirname $@)"
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$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
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# Compilation rules for *.S files.
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obj-$(ARCH)/%.S.o: src/%.S GNUmakefile
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mkdir -p "$$(dirname $@)"
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$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
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ifeq ($(ARCH),x86_64)
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# Compilation rules for *.asm (nasm) files.
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obj-$(ARCH)/%.asm.o: src/%.asm GNUmakefile
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mkdir -p "$$(dirname $@)"
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nasm $(NASMFLAGS) $< -o $@
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endif
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# Remove object files and the final executable.
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.PHONY: clean
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clean:
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rm -rf bin-$(ARCH) obj-$(ARCH) cc-runtime-$(ARCH)
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# Remove everything built and generated including downloaded dependencies.
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.PHONY: distclean
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distclean:
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rm -rf bin-* obj-* freestnd-c-hdrs cc-runtime* src/limine.h
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# Install the final built executable to its final on-root location.
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.PHONY: install
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install: all
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install -d "$(DESTDIR)$(PREFIX)/share/$(OUTPUT)"
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install -m 644 bin-$(ARCH)/$(OUTPUT) "$(DESTDIR)$(PREFIX)/share/$(OUTPUT)/$(OUTPUT)-$(ARCH)"
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# Try to undo whatever the "install" target did.
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.PHONY: uninstall
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uninstall:
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rm -f "$(DESTDIR)$(PREFIX)/share/$(OUTPUT)/$(OUTPUT)-$(ARCH)"
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-rmdir "$(DESTDIR)$(PREFIX)/share/$(OUTPUT)"
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