Makefile

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.DELETE_ON_ERROR:
 
CC = gcc
LD = ld
AS = as
 
CFLAGS = -m32 -std=c99 -pedantic-errors -fno-asm -ffreestanding -nostdlib -nostdinc -fno-stack-protector \
         -fno-builtin -fno-omit-frame-pointer -static -I src -fno-pic \
         -g2 -ggdb -gdwarf-2 -O0 -fasynchronous-unwind-tables \
         -Wnull-dereference -Wtrampolines -Wfloat-equal \
         -Wunsafe-loop-optimizations \
         -fno-strict-aliasing -fno-strict-overflow -fno-delete-null-pointer-checks -fno-ident -fno-common \
         -fvar-tracking-assignments -fno-merge-constants \
         -Wno-unused-parameter -Wswitch-enum -Wswitch-default -Wredundant-decls -Wpacked \
         -Wold-style-definition -Wmissing-field-initializers -Waggregate-return \
         -Wall -Wextra -Wpedantic -Wshadow -Wundef -Werror -Wc11-c23-compat -Wc99-c11-compat \
         -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wdouble-promotion \
         -Wwrite-strings -Wcast-align -Wcast-qual \
         -Wconversion -Wsign-conversion -Wunused -Wformat=2 -Wvla \
         -Wstack-usage=16384 -fstack-usage
LDFLAGS = -m elf_i386 -T linker.ld -static -nostdlib \
          -z max-page-size=0x1000 -z separate-code --gc-sections \
          -z noexecstack -z relro -z now \
          -Map=build/kernel.map \
          --warn-common --warn-unresolved-symbols \
          --no-undefined --no-undefined-version --check-sections \
          --no-warn-rwx-segments --fatal-warnings
AFLAGS = --32 -g --gdwarf-2 --noexecstack \
         --fatal-warnings
         
QEMU_FLAGS = -cpu 486 -m 3.8M -vga std
 
BUILD_DIR = build
SRC_DIR = src
ISO_DIR = $(BUILD_DIR)/iso
DISK_IMG = $(BUILD_DIR)/disk.img
DOXYGEN = doxygen
DOXYFILE = Doxyfile
DOCS_DIR = docs
 
ISOLINUX_BIN := syslinux/isolinux.bin
LDLINUX_C32 := syslinux/ldlinux.c32
MBOOT_C32 := syslinux/mboot.c32
LIBCOM_C32 := syslinux/libcom32.c32
 
C_SRCS = $(shell find $(SRC_DIR) -name "*.c")
ASM_SRCS = $(shell find $(SRC_DIR) -name "*.s")
OBJS = $(C_SRCS:$(SRC_DIR)/%.c=$(BUILD_DIR)/%.o) \
       $(ASM_SRCS:$(SRC_DIR)/%.s=$(BUILD_DIR)/%.o)
 
KERNEL = $(BUILD_DIR)/tape.elf
ISO = tape.iso
 
#silent build rules
VERBOSE ?= 0
ifeq ($(VERBOSE),0)
    Q = @
    ECHO_CC = @echo "  [ CC ]  $< -> $@"
    ECHO_AS = @echo "  [ AS ]  $< -> $@"
    ECHO_LD = @echo "  [ LD ]  linking kernel..."
    ECHO_MKDIR = @echo "  [ DR ]  creating build dirs..."
    ECHO_CP = @echo "  [ CP ]  copying files..."
    ECHO_ISO = @echo "  [ IO ] creating iso image..."
else
    Q = 
    ECHO_CC = @true
    ECHO_AS = @true
    ECHO_LD = @true
    ECHO_MKDIR = @true
    ECHO_CP = @true
    ECHO_ISO = @true
endif
 
all: $(BUILD_DIR) $(KERNEL)
 
$(BUILD_DIR):
    $(ECHO_MKDIR)
    $(Q)mkdir -p $(BUILD_DIR)
    $(Q)cd $(BUILD_DIR) && mkdir -p $(shell find $(SRC_DIR) -type d | sed 's|$(SRC_DIR)/||')
 
$(DISK_IMG):
    $(Q)dd if=/dev/zero of=$(DISK_IMG) bs=1k count=1440 2>/dev/null
    $(Q)mkfs.vfat -F 12 $(DISK_IMG) >/dev/null 2>&1
    @echo "  [ OK ]  $(DISK_IMG) $$(ls -lh $(DISK_IMG) | awk '{print $$5}')"
 
$(BUILD_DIR)/%.o: $(SRC_DIR)/%.c | $(BUILD_DIR)
    $(ECHO_CC)
    $(Q)$(CC) $(CFLAGS) -c $< -o $@
 
$(BUILD_DIR)/%.o: $(SRC_DIR)/%.s | $(BUILD_DIR)
    $(ECHO_AS)
    $(Q)$(AS) $(AFLAGS) $< -o $@
    $(Q)if [ -f $@ ]; then echo "  [ OK ]  $@ $$(ls -lh $@ | awk '{print $$5}')"; fi
 
$(KERNEL): $(OBJS)
    $(ECHO_LD)
    $(Q)$(LD) $(LDFLAGS) $^ -o $@
    @echo "  [ OK ]  $(KERNEL) $$(ls -lh $(KERNEL) | awk '{print $$5}')"
 
$(ISO_DIR)/isolinux.cfg:
    $(Q)mkdir -p $(ISO_DIR)
    $(Q)echo "DEFAULT tape" > $@
    $(Q)echo "LABEL tape" >> $@
    $(Q)echo "    KERNEL mboot.c32" >> $@
    $(Q)echo "    APPEND /tape.elf" >> $@
 
iso: $(KERNEL) $(ISO_DIR)/isolinux.cfg $(DISK_IMG)
    $(ECHO_CP)
    $(Q)cp $(KERNEL) $(ISO_DIR)/tape.elf
    $(Q)cp $(ISOLINUX_BIN) $(ISO_DIR)/
    $(Q)cp $(LDLINUX_C32) $(ISO_DIR)/
    $(Q)cp $(MBOOT_C32) $(ISO_DIR)/
    $(Q)cp $(LIBCOM_C32) $(ISO_DIR)/
    @echo "  [ OK ] kernel and boot files copied"
    $(ECHO_ISO)
    $(Q)xorriso -as mkisofs \
        -b isolinux.bin \
        -c boot.cat \
        -no-emul-boot \
        -boot-load-size 4 \
        -boot-info-table \
        -o $(ISO) $(ISO_DIR) >/dev/null 2>&1
    @echo "  [ OK ]  $(ISO) $$(ls -lh $(ISO) | awk '{print $$5}')"
    @echo ""
    @echo "  [ OK ] build complete"
    @echo "  kernel:  $$(ls -lh $(KERNEL) | awk '{print $$5}')"
    @echo "  iso:     $$(ls -lh $(ISO) | awk '{print $$5}')"
    @echo "  disk:    $$(ls -lh $(DISK_IMG) | awk '{print $$5}')"
    
run:
    @echo "  [ RN ]  starting qemu..."
    $(Q)qemu-system-i386 $(QEMU_FLAGS) -drive file=$(DISK_IMG),format=raw -cdrom $(ISO) -boot d -vnc none -display gtk
 
debug: iso
    @echo "  [ DG ]  starting qemu with gdb server on port 1234..."
    $(Q)qemu-system-i386 $(QEMU_FLAGS) -drive file=$(DISK_IMG),format=raw -cdrom $(ISO) -boot d -s -S --no-reboot --no-shutdown -vnc none -display gtk
 
clean:
    @echo "  [ CN ]  cleaning build artifacts..."
    $(Q)rm -rf $(BUILD_DIR) $(ISO)
    @echo "  [ OK ]  clean complete"
 
docs: $(DOXYFILE)
    @echo "  [ DC ]  generating docs..."
    $(Q)$(DOXYGEN) $(DOXYFILE)
    @echo "  [ OK ]  docs generated in $(DOCS_DIR)"
 
docs-clean:
    @echo "  [ CN ]  cleaning docs..."
    $(Q)rm -rf $(DOCS_DIR)
    @echo "  [ OK ]  docs cleaned"
 
help:
    @echo "  make iso          - build kernel iso"
    @echo "  make run          - Run in qemu"
    @echo "  make debug        - run with gdb debugging"
    @echo "  make clean        - clean build files"
    @echo "  make docs         - generate documentation"
    @echo "  make docs-clean   - clean documentation"
    @echo "  make help         - show this help"
    @echo ""
    @echo "  verbose build:    make VERBOSE=1 ..."
 
.PHONY: all iso run clean debug docs docs-clean help