Initial commit after splitting userspace from kernel tree

2020-01-07 16:22:33 +02:00
commit 638edb5166
36 changed files with 1856 additions and 0 deletions
@@ -0,0 +1,96 @@
+O?=build
+STAGE=$(O)/stage
+KERNEL_HDRS?=kernel-hdr
+
+CC=$(CROSS_COMPILE)gcc
+
+DIRS=$(O) \
+	 $(O)/libc \
+	 $(STAGE)
+HDRS=$(shell find $(S) -type f -name "*.h")
+STAGE_BIN=$(STAGE)/init \
+		  $(STAGE)/bin/hexd \
+		  $(STAGE)/bin/ls \
+		  $(STAGE)/bin/reboot
+
+CFLAGS=-ffreestanding \
+	   -nostdlib \
+	   -mno-sse \
+	   -mno-sse2 \
+	   -Ilibc/include \
+	   -ggdb \
+	   -O0 \
+	   -I$(KERNEL_HDRS)
+
+usr_LDFLAGS=-nostdlib \
+			-lgcc \
+			-Tlibc/program.ld
+usr_STATIC_LIBS=$(O)/libc.a
+
+libc_CRTI=$(O)/libc/crti.o
+libc_CRTN=$(O)/libc/crtn.o
+libc_OBJS=$(O)/libc/crt0.o \
+		  $(O)/libc/syscall.o \
+		  $(O)/libc/vsnprintf.o \
+		  $(O)/libc/printf.o \
+		  $(O)/libc/string.o \
+		  $(O)/libc/errno.o \
+		  $(O)/libc/stdio.o \
+		  $(O)/libc/init.o \
+		  $(O)/libc/malloc.o \
+		  $(O)/libc/dirent.o \
+		  $(O)/libc/signal.o \
+		  $(O)/libc/global.o \
+		  $(O)/libc/time.o
+
+sys_CRTBEGIN=$(shell $(CC) $(CFLAGS) -print-file-name=crtbegin.o)
+sys_CRTEND=$(shell $(CC) $(CFLAGS) -print-file-name=crtend.o)
+
+all: mkdirs $(O)/initrd.img
+
+clean:
+	rm -rf $(O)
+
+$(O)/initrd.img: mkstage-etc $(STAGE_BIN)
+	cd $(STAGE) && tar czf $(abspath $@) *
+
+mkdirs:
+	mkdir -p $(DIRS)
+
+mkstage-etc:
+	mkdir -p $(STAGE)/dev $(STAGE)/mnt $(STAGE)/bin
+	cp -r etc $(STAGE)
+
+# Application building
+$(STAGE)/init: init.c $(libc_CRTI) $(libc_CRTN) $(O)/libc.a
+	@printf " CC\t%s\n" $(@:$(STAGE)/%=/%)
+	@$(CC) -o $@ $(CFLAGS) $(usr_LDFLAGS) \
+		$(libc_CRTI) \
+		$(sys_CRTBEGIN) \
+		init.c \
+		$(sys_CRTEND) \
+		$(libc_CRTN) \
+		$(usr_STATIC_LIBS)
+
+$(STAGE)/bin/%: core/bin/%.c $(libc_CRTI) $(libc_CRTN) $(O)/libc.a
+	@printf " CC\t%s\n" $(@:$(STAGE)/%=/%)
+	@$(CC) -o $@ $(CFLAGS) $(usr_LDFLAGS) \
+		$(libc_CRTI) \
+		$(sys_CRTBEGIN) \
+		$< \
+		$(sys_CRTEND) \
+		$(libc_CRTN) \
+		$(usr_STATIC_LIBS)
+
+# libc building
+$(O)/libc.a: $(libc_OBJS)
+	@printf " AR\t%s\n" $(@:$(O)/%=%)
+	@$(AR) rcs $@ $(libc_OBJS)
+
+$(O)/libc/%.o: libc/%.c $(HDRS)
+	@printf " CC\t%s\n" $(@:$(O)/%=%)
+	@$(CC) -c -o $@ $(CFLAGS) $<
+
+$(O)/libc/%.o: libc/%.S
+	@printf " AS\t%s\n" $(@:$(O)/%=%)
+	@$(CC) -c -o $@ $(CFLAGS) $<