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GNUmakefile
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GNUmakefile
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#
# This makefile system follows the structuring conventions
# recommended by Peter Miller in his excellent paper:
#
# Recursive Make Considered Harmful
# http://aegis.sourceforge.net/auug97.pdf
#
OBJDIR := obj
# Run 'make V=1' to turn on verbose commands, or 'make V=0' to turn them off.
ifeq ($(V),1)
override V =
endif
ifeq ($(V),0)
override V = @
endif
-include conf/lab.mk
-include conf/env.mk
LABSETUP ?= ./
TOP = .
# Cross-compiler jos toolchain
#
# This Makefile will automatically use the cross-compiler toolchain
# installed as 'i386-jos-elf-*', if one exists. If the host tools ('gcc',
# 'objdump', and so forth) compile for a 32-bit x86 ELF target, that will
# be detected as well. If you have the right compiler toolchain installed
# using a different name, set GCCPREFIX explicitly in conf/env.mk
# try to infer the correct GCCPREFIX
ifndef GCCPREFIX
GCCPREFIX := $(shell if i386-jos-elf-objdump -i 2>&1 | grep '^elf32-i386$$' >/dev/null 2>&1; \
then echo 'i386-jos-elf-'; \
elif objdump -i 2>&1 | grep 'elf32-i386' >/dev/null 2>&1; \
then echo ''; \
else echo "***" 1>&2; \
echo "*** Error: Couldn't find an i386-*-elf version of GCC/binutils." 1>&2; \
echo "*** Is the directory with i386-jos-elf-gcc in your PATH?" 1>&2; \
echo "*** If your i386-*-elf toolchain is installed with a command" 1>&2; \
echo "*** prefix other than 'i386-jos-elf-', set your GCCPREFIX" 1>&2; \
echo "*** environment variable to that prefix and run 'make' again." 1>&2; \
echo "*** To turn off this error, run 'gmake GCCPREFIX= ...'." 1>&2; \
echo "***" 1>&2; exit 1; fi)
endif
# try to infer the correct QEMU
ifndef QEMU
QEMU := $(shell if which qemu >/dev/null 2>&1; \
then echo qemu; exit; \
elif which qemu-system-i386 >/dev/null 2>&1; \
then echo qemu-system-i386; exit; \
else \
qemu=/Applications/Q.app/Contents/MacOS/i386-softmmu.app/Contents/MacOS/i386-softmmu; \
if test -x $$qemu; then echo $$qemu; exit; fi; fi; \
echo "***" 1>&2; \
echo "*** Error: Couldn't find a working QEMU executable." 1>&2; \
echo "*** Is the directory containing the qemu binary in your PATH" 1>&2; \
echo "*** or have you tried setting the QEMU variable in conf/env.mk?" 1>&2; \
echo "***" 1>&2; exit 1)
endif
# try to generate a unique GDB port
GDBPORT := $(shell expr `id -u` % 5000 + 25000)
CC := $(GCCPREFIX)gcc -pipe
AS := $(GCCPREFIX)as
AR := $(GCCPREFIX)ar
LD := $(GCCPREFIX)ld
OBJCOPY := $(GCCPREFIX)objcopy
OBJDUMP := $(GCCPREFIX)objdump
NM := $(GCCPREFIX)nm
# Native commands
NCC := gcc $(CC_VER) -pipe
NATIVE_CFLAGS := $(CFLAGS) $(DEFS) $(LABDEFS) -I$(TOP) -MD -Wall
TAR := gtar
PERL := perl
# Compiler flags
# -fno-builtin is required to avoid refs to undefined functions in the kernel.
# Only optimize to -O1 to discourage inlining, which complicates backtraces.
CFLAGS := $(CFLAGS) $(DEFS) $(LABDEFS) -O1 -fno-builtin -I$(TOP) -MD
CFLAGS += -fno-omit-frame-pointer
CFLAGS += -std=gnu99
CFLAGS += -static
CFLAGS += -Wall -Wno-format -Wno-unused -Werror -gstabs -m32
# -fno-tree-ch prevented gcc from sometimes reordering read_ebp() before
# mon_backtrace()'s function prologue on gcc version: (Debian 4.7.2-5) 4.7.2
CFLAGS += -fno-tree-ch
# Add -fno-stack-protector if the option exists.
CFLAGS += $(shell $(CC) -fno-stack-protector -E -x c /dev/null >/dev/null 2>&1 && echo -fno-stack-protector)
# Common linker flags
LDFLAGS := -m elf_i386
# Linker flags for JOS user programs
ULDFLAGS := -T user/user.ld
GCC_LIB := $(shell $(CC) $(CFLAGS) -print-libgcc-file-name)
# Lists that the */Makefrag makefile fragments will add to
OBJDIRS :=
# Make sure that 'all' is the first target
all:
# Eliminate default suffix rules
.SUFFIXES:
# Delete target files if there is an error (or make is interrupted)
.DELETE_ON_ERROR:
# make it so that no intermediate .o files are ever deleted
.PRECIOUS: %.o $(OBJDIR)/boot/%.o $(OBJDIR)/kern/%.o \
$(OBJDIR)/lib/%.o $(OBJDIR)/fs/%.o $(OBJDIR)/net/%.o \
$(OBJDIR)/user/%.o
KERN_CFLAGS := $(CFLAGS) -DJOS_KERNEL -gstabs
USER_CFLAGS := $(CFLAGS) -DJOS_USER -gstabs
# Update .vars.X if variable X has changed since the last make run.
#
# Rules that use variable X should depend on $(OBJDIR)/.vars.X. If
# the variable's value has changed, this will update the vars file and
# force a rebuild of the rule that depends on it.
$(OBJDIR)/.vars.%: FORCE
$(V)echo "$($*)" | cmp -s $@ || echo "$($*)" > $@
.PRECIOUS: $(OBJDIR)/.vars.%
.PHONY: FORCE
# Include Makefrags for subdirectories
include boot/Makefrag
include kern/Makefrag
include lib/Makefrag
include user/Makefrag
include fs/Makefrag
CPUS ?= 1
QEMUOPTS = -drive file=$(OBJDIR)/kern/kernel.img,index=0,media=disk,format=raw -serial mon:stdio -gdb tcp::$(GDBPORT)
QEMUOPTS += $(shell if $(QEMU) -nographic -help | grep -q '^-D '; then echo '-D qemu.log'; fi)
IMAGES = $(OBJDIR)/kern/kernel.img
QEMUOPTS += -smp $(CPUS)
QEMUOPTS += -drive file=$(OBJDIR)/fs/fs.img,index=1,media=disk,format=raw
IMAGES += $(OBJDIR)/fs/fs.img
QEMUOPTS += $(QEMUEXTRA)
.gdbinit: .gdbinit.tmpl
sed "s/localhost:1234/localhost:$(GDBPORT)/" < $^ > $@
gdb:
gdb -n -x .gdbinit
pre-qemu: .gdbinit
qemu: $(IMAGES) pre-qemu
$(QEMU) $(QEMUOPTS)
qemu-nox: $(IMAGES) pre-qemu
@echo "***"
@echo "*** Use Ctrl-a x to exit qemu"
@echo "***"
$(QEMU) -nographic $(QEMUOPTS)
qemu-gdb: $(IMAGES) pre-qemu
@echo "***"
@echo "*** Now run 'make gdb'." 1>&2
@echo "***"
$(QEMU) $(QEMUOPTS) -S
qemu-nox-gdb: $(IMAGES) pre-qemu
@echo "***"
@echo "*** Now run 'make gdb'." 1>&2
@echo "***"
$(QEMU) -nographic $(QEMUOPTS) -S
print-qemu:
@echo $(QEMU)
print-gdbport:
@echo $(GDBPORT)
# For deleting the build
clean:
rm -rf $(OBJDIR) .gdbinit jos.in qemu.log
realclean: clean
rm -rf lab$(LAB).tar.gz \
jos.out $(wildcard jos.out.*) \
qemu.pcap $(wildcard qemu.pcap.*) \
myapi.key
distclean: realclean
rm -rf conf/gcc.mk
ifneq ($(V),@)
GRADEFLAGS += -v
endif
grade:
@echo $(MAKE) clean
@$(MAKE) clean || \
(echo "'make clean' failed. HINT: Do you have another running instance of JOS?" && exit 1)
./grade-lab$(LAB) $(GRADEFLAGS)
git-handin: handin-check
@if test -n "`git config remote.handin.url`"; then \
echo "Hand in to remote repository using 'git push handin HEAD' ..."; \
if ! git push -f handin HEAD; then \
echo ; \
echo "Hand in failed."; \
echo "As an alternative, please run 'make tarball'"; \
echo "and visit http://pdos.csail.mit.edu/6.828/submit/"; \
echo "to upload lab$(LAB)-handin.tar.gz. Thanks!"; \
false; \
fi; \
else \
echo "Hand-in repository is not configured."; \
echo "Please run 'make handin-prep' first. Thanks!"; \
false; \
fi
WEBSUB := https://6828.scripts.mit.edu/2016/handin.py
handin: tarball-pref myapi.key
@SUF=$(LAB); \
test -f .suf && SUF=`cat .suf`; \
curl -f -F file=@lab$$SUF-handin.tar.gz -F key=\<myapi.key $(WEBSUB)/upload \
> /dev/null || { \
echo ; \
echo Submit seems to have failed.; \
echo Please go to $(WEBSUB)/ and upload the tarball manually.; }
handin-check:
@if ! test -d .git; then \
echo No .git directory, is this a git repository?; \
false; \
fi
@if test "$$(git symbolic-ref HEAD)" != refs/heads/lab$(LAB); then \
git branch; \
read -p "You are not on the lab$(LAB) branch. Hand-in the current branch? [y/N] " r; \
test "$$r" = y; \
fi
@if ! git diff-files --quiet || ! git diff-index --quiet --cached HEAD; then \
git status; \
echo; \
echo "You have uncomitted changes. Please commit or stash them."; \
false; \
fi
@if test -n "`git ls-files -o --exclude-standard`"; then \
git status; \
read -p "Untracked files will not be handed in. Continue? [y/N] " r; \
test "$$r" = y; \
fi
UPSTREAM := $(shell git remote -v | grep "pdos.csail.mit.edu/6.828/2016/jos.git (fetch)" | awk '{split($$0,a," "); print a[1]}')
tarball-pref: handin-check
@SUF=$(LAB); \
if test $(LAB) -eq 3 -o $(LAB) -eq 4; then \
read -p "Which part would you like to submit? [a, b, c (c for lab 4 only)]" p; \
if test "$$p" != a -a "$$p" != b; then \
if test ! $(LAB) -eq 4 -o ! "$$p" = c; then \
echo "Bad part \"$$p\""; \
exit 1; \
fi; \
fi; \
SUF="$(LAB)$$p"; \
echo $$SUF > .suf; \
else \
rm -f .suf; \
fi; \
git archive --format=tar HEAD > lab$$SUF-handin.tar; \
git diff $(UPSTREAM)/lab$(LAB) > /tmp/lab$$SUF-diff.patch; \
tar -rf lab$$SUF-handin.tar /tmp/lab$$SUF-diff.patch; \
gzip -c lab$$SUF-handin.tar > lab$$SUF-handin.tar.gz; \
rm lab$$SUF-handin.tar; \
rm /tmp/lab$$SUF-diff.patch; \
myapi.key:
@echo Get an API key for yourself by visiting $(WEBSUB)/
@read -p "Please enter your API key: " k; \
if test `echo -n "$$k" |wc -c` = 32 ; then \
TF=`mktemp -t tmp.XXXXXX`; \
if test "x$$TF" != "x" ; then \
echo -n "$$k" > $$TF; \
mv -f $$TF $@; \
else \
echo mktemp failed; \
false; \
fi; \
else \
echo Bad API key: $$k; \
echo An API key should be 32 characters long.; \
false; \
fi;
#handin-prep:
# @./handin-prep
# For test runs
prep-%:
$(V)$(MAKE) "INIT_CFLAGS=${INIT_CFLAGS} -DTEST=`case $* in *_*) echo $*;; *) echo user_$*;; esac`" $(IMAGES)
run-%-nox-gdb: prep-% pre-qemu
$(QEMU) -nographic $(QEMUOPTS) -S
run-%-gdb: prep-% pre-qemu
$(QEMU) $(QEMUOPTS) -S
run-%-nox: prep-% pre-qemu
$(QEMU) -nographic $(QEMUOPTS)
run-%: prep-% pre-qemu
$(QEMU) $(QEMUOPTS)
# This magic automatically generates makefile dependencies
# for header files included from C source files we compile,
# and keeps those dependencies up-to-date every time we recompile.
# See 'mergedep.pl' for more information.
$(OBJDIR)/.deps: $(foreach dir, $(OBJDIRS), $(wildcard $(OBJDIR)/$(dir)/*.d))
@mkdir -p $(@D)
@$(PERL) mergedep.pl $@ $^
-include $(OBJDIR)/.deps
always:
@:
.PHONY: all always \
handin git-handin tarball tarball-pref clean realclean distclean grade handin-prep handin-check