Makefile

K=kernel
U=user

OBJS = \
  $K/entry.o \
  $K/start.o \
  $K/console.o \
  $K/printf.o \
  $K/uart.o \
  $K/kalloc.o \
  $K/spinlock.o \
  $K/string.o \
  $K/main.o \
  $K/vm.o \
  $K/proc.o \
  $K/swtch.o \
  $K/trampoline.o \
  $K/trap.o \
  $K/syscall.o \
  $K/sysproc.o \
  $K/bio.o \
  $K/fs.o \
  $K/log.o \
  $K/sleeplock.o \
  $K/file.o \
  $K/pipe.o \
  $K/exec.o \
  $K/sysfile.o \
  $K/kernelvec.o \
  $K/plic.o \
  $K/virtio_disk.o\
  $K/vmcopyin.o\
  $K/stats.o\
  $K/sprintf.o\
  $K/e1000.o \
  $K/net.o \
  $K/sysnet.o \
  $K/pci.o
# riscv64-unknown-elf- or riscv64-linux-gnu-
# 可能在 /opt/riscv/bin
#TOOLPREFIX = 

# 尝试去推导正确的TOOLPREFIX，如果没有设置的话
ifndef TOOLPREFIX
TOOLPREFIX := $(shell if riscv64-unknown-elf-objdump -i 2>&1 | grep 'elf64-big' >/dev/null 2>&1; \
	then echo 'riscv64-unknown-elf-'; \
	elif riscv64-linux-gnu-objdump -i 2>&1 | grep 'elf64-big' >/dev/null 2>&1; \
	then echo 'riscv64-linux-gnu-'; \
	elif riscv64-unknown-linux-gnu-objdump -i 2>&1 | grep 'elf64-big' >/dev/null 2>&1; \
	then echo 'riscv64-unknown-linux-gnu-'; \
	else echo "***" 1>&2; \
	echo "*** Error: Couldn't find a riscv64 version of GCC/binutils." 1>&2; \
	echo "*** To turn off this error, run 'gmake TOOLPREFIX= ...'." 1>&2; \
	echo "***" 1>&2; exit 1; fi)
endif

QEMU = qemu-system-riscv64

CC = $(TOOLPREFIX)gcc
AS = $(TOOLPREFIX)gas
LD = $(TOOLPREFIX)ld
OBJCOPY = $(TOOLPREFIX)objcopy
OBJDUMP = $(TOOLPREFIX)objdump

CFLAGS = -Wall -Werror -O -fno-omit-frame-pointer -ggdb

ifdef LAB
LABUPPER = $(shell echo $(LAB) | tr a-z A-Z)
XCFLAGS += -DSOL_$(LABUPPER) -DLAB_$(LABUPPER)
endif

CFLAGS += $(XCFLAGS)
CFLAGS += -MD
CFLAGS += -mcmodel=medany
CFLAGS += -ffreestanding -fno-common -nostdlib -mno-relax
CFLAGS += -I.
CFLAGS += $(shell $(CC) -fno-stack-protector -E -x c /dev/null >/dev/null 2>&1 && echo -fno-stack-protector)

CFLAGS += -DNET_TESTS_PORT=$(SERVERPORT)

# 如果可能禁用PIE（对于 Ubuntu 16.10工具链（toolchain））
ifneq ($(shell $(CC) -dumpspecs 2>/dev/null | grep -e '[^f]no-pie'),)
CFLAGS += -fno-pie -no-pie
endif
ifneq ($(shell $(CC) -dumpspecs 2>/dev/null | grep -e '[^f]nopie'),)
CFLAGS += -fno-pie -nopie
endif

LDFLAGS = -z max-page-size=4096

$K/kernel: $(OBJS) $K/kernel.ld $U/initcode
	$(LD) $(LDFLAGS) -T $K/kernel.ld -o $K/kernel $(OBJS) 
	$(OBJDUMP) -S $K/kernel > $K/kernel.asm
	$(OBJDUMP) -t $K/kernel | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > $K/kernel.sym

$U/initcode: $U/initcode.S
	$(CC) $(CFLAGS) -march=rv64g -nostdinc -I. -Ikernel -c $U/initcode.S -o $U/initcode.o
	$(LD) $(LDFLAGS) -N -e start -Ttext 0 -o $U/initcode.out $U/initcode.o
	$(OBJCOPY) -S -O binary $U/initcode.out $U/initcode
	$(OBJDUMP) -S $U/initcode.o > $U/initcode.asm

tags: $(OBJS) _init
	etags *.S *.c

ULIB = $U/ulib.o $U/usys.o $U/printf.o $U/umalloc.o

ULIB += $U/statistics.o

_%: %.o $(ULIB)
	$(LD) $(LDFLAGS) -N -e main -Ttext 0 -o $@ $^
	$(OBJDUMP) -S $@ > $*.asm
	$(OBJDUMP) -t $@ | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > $*.sym

$U/usys.S : $U/usys.pl
	perl $U/usys.pl > $U/usys.S

$U/usys.o : $U/usys.S
	$(CC) $(CFLAGS) -c -o $U/usys.o $U/usys.S

$U/_forktest: $U/forktest.o $(ULIB)
	# forktest中链接的库代码较少-需要很小
    # 为了能最大化进程表。
	$(LD) $(LDFLAGS) -N -e main -Ttext 0 -o $U/_forktest $U/forktest.o $U/ulib.o $U/usys.o
	$(OBJDUMP) -S $U/_forktest > $U/forktest.asm

mkfs/mkfs: mkfs/mkfs.c $K/fs.h $K/param.h
	gcc $(XCFLAGS) -Werror -Wall -I. -o mkfs/mkfs mkfs/mkfs.c

# 防止在第一次生成后删除中间文件（如cat.o），以便第一次生成后的磁盘映像更改在清除之前保持不变。
# 详情请看:
# http://www.gnu.org/software/make/manual/html_node/Chained-Rules.html
.PRECIOUS: %.o

UPROGS=\
	$U/_cat\
	$U/_echo\
	$U/_forktest\
	$U/_grep\
	$U/_init\
	$U/_kill\
	$U/_ln\
	$U/_ls\
	$U/_mkdir\
	$U/_rm\
	$U/_sh\
	$U/_stressfs\
	$U/_usertests\
	$U/_grind\
	$U/_wc\
	$U/_zombie\
	$U/_sleep\
	$U/_pingpong\
	$U/_primes\
	$U/_find\
	$U/_xargs\
	$U/_trace\
	$U/_sysinfotest\
	$U/_stats\
	$U/_call\
	$U/_alarmtest\
	$U/_bttest\
	$U/_lazytests\
	$U/_cowtest\
	$U/_uthread\
	$U/_bcachetest\
	$U/_kalloctest\
	$U/_bigfile\
	$U/_symlinktest\
	$U/_mmaptest\
	$U/_nettests\
	
$U/uthread_switch.o : $U/uthread_switch.S
	$(CC) $(CFLAGS) -c -o $U/uthread_switch.o $U/uthread_switch.S

$U/_uthread: $U/uthread.o $U/uthread_switch.o $(ULIB)
	$(LD) $(LDFLAGS) -N -e main -Ttext 0 -o $U/_uthread $U/uthread.o $U/uthread_switch.o $(ULIB)
	$(OBJDUMP) -S $U/_uthread > $U/uthread.asm

ph: notxv6/ph.c
	gcc -o ph -g -O2 notxv6/ph.c -pthread

barrier: notxv6/barrier.c
	gcc -o barrier -g -O2 notxv6/barrier.c -pthread

fs.img: mkfs/mkfs README $(UPROGS) user/xargstest.sh
	mkfs/mkfs fs.img README $(UPROGS) user/xargstest.sh

-include kernel/*.d user/*.d

clean: 
	rm -rf *.tex *.dvi *.idx *.aux *.log *.ind *.ilg \
	*/*.o */*.d */*.asm */*.sym \
	$U/initcode $U/initcode.out $K/kernel fs.img \
	mkfs/mkfs .gdbinit \
        $U/usys.S \
	$(UPROGS) \
	xv6.out* \
	gradelib.pyc \
	ph \
	barrier \
	*.dSYM \
	*.pcap \

# 尝试去生成一个唯一的GDB端口
GDBPORT = $(shell expr `id -u` % 5000 + 25000)
# QEMU的gdb stub命令行在0.11中发生了更改
QEMUGDB = $(shell if $(QEMU) -help | grep -q '^-gdb'; \
	then echo "-gdb tcp::$(GDBPORT)"; \
	else echo "-s -p $(GDBPORT)"; fi)
ifndef CPUS
CPUS := 3
endif

FWDPORT = $(shell expr `id -u` % 5000 + 25999)

QEMUOPTS = -machine virt -bios none -kernel $K/kernel -m 128M -smp $(CPUS) -nographic
QEMUOPTS += -drive file=fs.img,if=none,format=raw,id=x0
QEMUOPTS += -device virtio-blk-device,drive=x0,bus=virtio-mmio-bus.0

QEMUOPTS += -netdev user,id=net0,hostfwd=udp::$(FWDPORT)-:2000 -object filter-dump,id=net0,netdev=net0,file=packets.pcap
QEMUOPTS += -device e1000,netdev=net0,bus=pcie.0

qemu: $K/kernel fs.img
	$(QEMU) $(QEMUOPTS)

.gdbinit: .gdbinit.tmpl-riscv
	sed "s/:1234/:$(GDBPORT)/" < $^ > $@

qemu-gdb: $K/kernel .gdbinit fs.img
	@echo "*** Now run 'gdb' in another window." 1>&2
	$(QEMU) $(QEMUOPTS) -S $(QEMUGDB)

# 尝试生成唯一的端口给echo server
SERVERPORT = $(shell expr `id -u` % 5000 + 25099)

server:
	python3 server.py $(SERVERPORT)

ping:
	python3 ping.py $(FWDPORT)

##
##  用于测试实验评分脚本
##

ifneq ($(V),@)
GRADEFLAGS += -v
endif

print-gdbport:
	@echo $(GDBPORT)

grade:
	@echo $(MAKE) clean
	@$(MAKE) clean || \
          (echo "'make clean' failed.  HINT: Do you have another running instance of xv6?" && exit 1)
	./grade-lab-$(LAB) $(GRADEFLAGS)