172 lines
6.2 KiB
Makefile
172 lines
6.2 KiB
Makefile
# Makefile for AbstractMachine Kernels and Libraries
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include scripts/helpers/rules.mk
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### *Get a more readable version of this Makefile* by `make html` (requires python-markdown)
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html:
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# cat Makefile | sed 's/^\([^#]\)/ \1/g' | markdown_py > Makefile.html
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cat Makefile | markdown_py > Makefile.html
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.PHONY: html
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## 1. Basic Setup and Checks
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### Default to create a bare-metal kernel image
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ifeq ($(MAKECMDGOALS),)
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MAKECMDGOALS = image
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.DEFAULT_GOAL = image
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endif
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### Override checks when `make clean/clean-all/html`
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ifeq ($(findstring $(MAKECMDGOALS),clean|clean-all|html),)
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### Check: environment variable `$AM_HOME` looks sane
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ifeq ($(wildcard $(AM_HOME)/am/include/am.h),)
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$(error $$AM_HOME must be an AbstractMachine repo)
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endif
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### Check: environment variable `$ARCH` must be in the supported list
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ARCHS = $(basename $(notdir $(shell ls $(AM_HOME)/scripts/*.mk)))
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ifeq ($(filter $(ARCHS), $(ARCH)), )
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$(error Expected $$ARCH in {$(ARCHS)}, Got "$(ARCH)")
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endif
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### Extract instruction set architecture (`ISA`) and platform from `$ARCH`. Example: `ARCH=x86_64-qemu -> ISA=x86_64; PLATFORM=qemu`
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ARCH_SPLIT = $(subst -, ,$(ARCH))
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ISA = $(word 1,$(ARCH_SPLIT))
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PLATFORM = $(word 2,$(ARCH_SPLIT))
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### Checks end here
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endif
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## 2. General Compilation Targets
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### Create the destination directory (`build/$ARCH`)
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WORK_DIR ?= $(shell pwd)
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DST_DIR ?= $(WORK_DIR)/build/$(ARCH)
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LIB_BUILDDIR ?= $(DST_DIR)/lib
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INSTALLDIR ?= $(WORK_DIR)/build/install/$(ARCH)
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LIB_INSTALLDIR ?= $(INSTALLDIR)/lib
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INC_INSTALLDIR ?= $(INSTALLDIR)/include
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## 3. General Compilation Flags
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### (Cross) compilers, e.g., mips-linux-gnu-g++
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CC ?= $(CROSS_COMPILE)gcc
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AS := $(CC)
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CXX ?= $(CROSS_COMPILE)g++
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LD ?= $(CROSS_COMPILE)ld
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AR ?= $(CROSS_COMPILE)ar
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OBJDUMP ?= $(CROSS_COMPILE)objdump
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OBJCOPY ?= $(CROSS_COMPILE)objcopy
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READELF ?= $(CROSS_COMPILE)readelf
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CXXFLAGS += $(CFLAGS) -ffreestanding -fno-rtti -fno-exceptions
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LDFLAGS += -z noexecstack
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INTERFACE_LDFLAGS += -z noexecstack
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## 4. Arch-Specific Configurations
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### Fall back to native gcc/binutils if there is no cross compiler
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ifeq ($(wildcard $(shell which $(CC))),)
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$(info # $(CC) not found; fall back to default gcc and binutils)
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CROSS_COMPILE := riscv64-unknown-linux-gnu-
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endif
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## 5. Compilation Rules
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BUILDDIR := $(DST_DIR)
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### Build libam
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#### Include archetecture specific build flags
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include $(AM_HOME)/scripts/$(ARCH).mk
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#### Generating build rules with ADD_LIBRARY call. Target specific build flags can be tuned via changing prefixed variables (AM_ here)
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AM_INCPATH += $(AM_HOME)/am/include $(AM_HOME)/am/src $(AM_HOME)/klib/include
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AM_CFLAGS += -lm -g -O3 -MMD -Wall $(addprefix -I, $(AM_INCPATH)) \
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-D__ISA__=\"$(ISA)\" -D__ISA_$(shell echo $(ISA) | tr a-z A-Z)__ \
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-D__ARCH__=$(ARCH) -D__ARCH_$(shell echo $(ARCH) | tr a-z A-Z | tr - _) \
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-D__PLATFORM__=$(PLATFORM) -D__PLATFORM_$(shell echo $(PLATFORM) | tr a-z A-Z | tr - _) \
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-DARCH_H=\"$(ARCH_H)\"
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AM_INTERFACE_INCPATH += $(AM_HOME)/am/include $(AM_HOME)/klib/include
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AM_INTERFACE_CFLAGS += $(addprefix -I, $(AM_INTERFACE_INCPATH:%=$(INC_INSTALLDIR))) \
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-lm -DARCH_H=\"$(ARCH_H)\" -fno-asynchronous-unwind-tables -fno-builtin -fno-stack-protector \
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-Wno-main -U_FORTIFY_SOURCE -fvisibility=hidden
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$(eval $(call ADD_LIBRARY,$(LIB_BUILDDIR)/libam-$(ARCH).a,AM_))
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### Build klib
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KLIB_SRCS := $(shell find klib/src/ -name "*.c")
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KLIB_INCPATH += $(AM_HOME)/am/include $(AM_HOME)/klib/include
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KLIB_CFLAGS += -MMD -Wall $(addprefix -I, $(KLIB_INCPATH)) \
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-DARCH_H=\"$(ARCH_H)\"
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KLIB_INTERFACE_INCPATH += $(AM_HOME)/am/include $(AM_HOME)/klib/include
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KLIB_INTERFACE_CFLAGS += -DARCH_H=\"$(ARCH_H)\" $(addprefix -I, $(KLIB_INTERFACE_INCPATH:%=$(INC_INSTALLDIR)))
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$(eval $(call ADD_LIBRARY,$(LIB_BUILDDIR)/libklib-$(ARCH).a,KLIB_))
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LIBS := am klib
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libs: $(addsuffix -$(ARCH).a, $(addprefix $(LIB_BUILDDIR)/lib, $(ALL)))
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$(LIBS): %: $(addsuffix -$(ARCH).a, $(addprefix $(LIB_BUILDDIR)/lib, %))
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### Rule (link): objects (`*.o`) and libraries (`*.a`) -> `IMAGE.elf`, the final ELF binary to be packed into image (ld)
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$(IMAGE).elf: $(OBJS) $(LIBS)
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@echo + LD "->" $(IMAGE_REL).elf
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@$(LD) $(LDFLAGS) -o $(IMAGE).elf --start-group $(LINKAGE) --end-group
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## 6. Miscellaneous
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### Build order control
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image: image-dep
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archive: $(ARCHIVE)
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image-dep: $(OBJS) $(LIBS)
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@echo \# Creating image [$(ARCH)]
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.PHONY: image image-dep archive run libs $(LIBS) install
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### Install rules
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INTERFACE_INCPATH += $(sort $(KLIB_INTERFACE_INCPATH) $(AM_INTERFACE_INCPATH))
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INTERFACE_CFLAGS += $(sort $(KLIB_INTERFACE_CFLAGS) $(AM_INTERFACE_CFLAGS))
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INTERFACE_LDFLAGS += $(sort $(KLIB_LDFLAGS) $(AM_LDFLAGS))
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EXPORT_FLAGS_FILE := $(LIB_INSTALLDIR)/make/flags-$(ARCH).mk
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EXPORT_FLAGS_TEMPLATE := $(file < $(AM_HOME)/scripts/templates/flags.tmpl)
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HELPERS := $(wildcard find scripts/helpers/*.mk)
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EXPORT_HELPERS := $(HELPERS:scripts/helpers/%=$(LIB_INSTALLDIR)/make/%)
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EXPORTS := $(EXPORT_FLAGS_FILE) $(EXPORT_HELPERS)
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$(EXPORT_HELPERS): $(LIB_INSTALLDIR)/make/%: scripts/helpers/%
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@echo + INSTALL $(patsubst $(INSTALLDIR)/%,%,$@)
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@install -dm755 $(dir $@)
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@install -Dm644 $< $(dir $@)
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export INTERFACE_CFLAGS INTERFACE_INCPATH INTERFACE_LDFLAGS
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$(EXPORT_FLAGS_FILE):
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@echo + INSTALL $(patsubst $(INSTALLDIR)/%,%,$@)
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@install -Dm644 <(printf $(EXPORT_FLAGS_TEMPLATE)) $(EXPORT_FLAGS_FILE)
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install-libs: $(LIBS)
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@echo + INSTALL LIBS: $(LIBS)
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@install -dm755 $(LIB_INSTALLDIR)
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@install -Dm644 $(addsuffix -$(ARCH).a, $(addprefix $(LIB_BUILDDIR)/lib, $(LIBS))) $(LIB_INSTALLDIR)
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install-headers: HEADERS := $(shell find $(INTERFACE_INCPATH) -name '*.h')
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install-headers: $(HEADERS) # Headers needs to be reinstalled if they are changed
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@echo + INSTALL HEADERS: $(INTERFACE_INCPATH)
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@install -dm755 $(INC_INSTALLDIR)
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@cp -r $(addsuffix /*, $(INTERFACE_INCPATH)) $(INC_INSTALLDIR)
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install: $(EXPORTS) install-libs install-headers
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### Clean a single project (remove `build/`)
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clean:
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rm -rf Makefile.html $(WORK_DIR)/build/
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.PHONY: clean
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### Clean all sub-projects within depth 2 (and ignore errors)
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CLEAN_ALL = $(dir $(shell find . -mindepth 2 -name Makefile))
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clean-all: $(CLEAN_ALL) clean
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$(CLEAN_ALL):
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-@$(MAKE) -s -C $@ cleaear
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