2 # This file is included by the global makefile so that you can add your own
3 # architecture-specific flags and dependencies.
5 # Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
6 # Licensed under the GPL
10 OS := $(shell uname -s)
11 # We require bash because the vmlinux link and loader script cpp use bash
15 filechk_gen_header = $<
17 core-y += $(ARCH_DIR)/kernel/ \
18 $(ARCH_DIR)/drivers/ \
21 # XXX: The "os" symlink is only used by arch/um/include/os.h, which includes
22 # ../os/include/file.h
24 # These are cleaned up during mrproper. Please DO NOT fix it again, this is
25 # the Correct Thing(tm) to do!
26 ARCH_SYMLINKS = $(ARCH_DIR)/os $(ARCH_DIR)/include/shared/uml-config.h
28 MODE_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include/shared/skas
30 include $(srctree)/$(ARCH_DIR)/Makefile-skas
32 ARCH_INCLUDE := -I$(srctree)/$(ARCH_DIR)/include/shared
33 ARCH_INCLUDE += -I$(srctree)/$(ARCH_DIR)/sys-$(SUBARCH)/shared
34 ifneq ($(KBUILD_SRC),)
35 ARCH_INCLUDE += -I$(ARCH_DIR)/include/shared # for three generated files
37 KBUILD_CPPFLAGS += -I$(srctree)/$(ARCH_DIR)/sys-$(SUBARCH)
39 # -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
40 # named - it's a common symbol in libpcap, so we get a binary which crashes.
42 # Same things for in6addr_loopback and mktime - found in libc. For these two we
43 # only get link-time error, luckily.
45 # These apply to USER_CFLAGS to.
47 KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ -DSUBARCH=\"$(SUBARCH)\" \
48 $(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap \
49 -Din6addr_loopback=kernel_in6addr_loopback \
50 -Din6addr_any=kernel_in6addr_any
52 KBUILD_AFLAGS += $(ARCH_INCLUDE)
54 USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -D__KERNEL__,,\
55 $(patsubst -I%,,$(KBUILD_CFLAGS)))) $(ARCH_INCLUDE) $(MODE_INCLUDE) \
56 $(filter -I%,$(CFLAGS)) -D_FILE_OFFSET_BITS=64
58 include $(srctree)/$(ARCH_DIR)/Makefile-$(SUBARCH)
60 #This will adjust *FLAGS accordingly to the platform.
61 include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
63 KBUILD_CPPFLAGS += -I$(srctree)/arch/$(HEADER_ARCH)/include
65 # -Derrno=kernel_errno - This turns all kernel references to errno into
66 # kernel_errno to separate them from the libc errno. This allows -fno-common
67 # in KBUILD_CFLAGS. Otherwise, it would cause ld to complain about the two different
69 # These apply to kernelspace only.
71 # strip leading and trailing whitespace to make the USER_CFLAGS removal of these
74 KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
75 -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
76 KBUILD_CFLAGS += $(KERNEL_DEFINES)
87 echo '* linux - Binary kernel image (./linux) - for backward'
88 echo ' compatibility only, this creates a hard link to the'
89 echo ' real kernel binary, the "vmlinux" binary you'
90 echo ' find in the kernel root.'
93 ifneq ($(KBUILD_SRC),)
94 $(shell mkdir -p $(ARCH_DIR) && ln -fsn $(srctree)/$(ARCH_DIR)/Kconfig.$(HEADER_ARCH) $(ARCH_DIR)/Kconfig.arch)
96 $(shell ln -fsn Kconfig.$(HEADER_ARCH) $(ARCH_DIR)/Kconfig.arch)
99 archprepare: $(ARCH_SYMLINKS) $(ARCH_DIR)/include/shared/user_constants.h
100 prepare: $(ARCH_DIR)/include/shared/kern_constants.h
102 LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
103 LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
105 CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
106 $(call cc-option, -fno-stack-protector,) \
107 $(call cc-option, -fno-stack-protector-all,)
109 CONFIG_KERNEL_STACK_ORDER ?= 2
110 STACK_SIZE := $(shell echo $$[ 4096 * (1 << $(CONFIG_KERNEL_STACK_ORDER)) ] )
112 CPPFLAGS_vmlinux.lds = -U$(SUBARCH) -DSTART=$(START) -DELF_ARCH=$(ELF_ARCH) \
113 -DELF_FORMAT="$(ELF_FORMAT)" -DKERNEL_STACK_SIZE=$(STACK_SIZE)
115 # The wrappers will select whether using "malloc" or the kernel allocator.
116 LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
118 LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))
120 CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
122 $(CC) $(CFLAGS_vmlinux) -o $@ \
123 -Wl,-T,$(vmlinux-lds) $(vmlinux-init) \
124 -Wl,--start-group $(vmlinux-main) -Wl,--end-group \
126 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o \
127 FORCE ,$^) ; rm -f linux
130 # When cleaning we don't include .config, so we don't include
131 # TT or skas makefiles and don't clean skas_ptregs.h.
132 CLEAN_FILES += linux x.i gmon.out $(ARCH_DIR)/include/shared/uml-config.h \
133 $(ARCH_DIR)/include/shared/user_constants.h \
134 $(ARCH_DIR)/include/shared/kern_constants.h $(ARCH_DIR)/Kconfig.arch
136 MRPROPER_FILES += $(ARCH_SYMLINKS)
139 @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
140 -o -name '*.gcov' \) -type f -print | xargs rm -f
142 $(objtree)/$(ARCH_DIR)/include/shared:
148 ifneq ($(KBUILD_SRC),)
149 $(Q)ln -fsn $(srctree)/$(ARCH_DIR)/os-$(OS) $@
151 $(Q)ln -fsn os-$(OS) $@
155 define filechk_umlconfig
156 sed 's/ CONFIG/ UML_CONFIG/'
159 $(ARCH_DIR)/include/shared/uml-config.h : include/linux/autoconf.h
160 $(call filechk,umlconfig)
162 $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s: FORCE
163 $(Q)$(MAKE) $(build)=$(ARCH_DIR)/sys-$(SUBARCH) $@
165 define filechk_gen-asm-offsets
168 echo " * DO NOT MODIFY."; \
170 echo " * This file was generated by arch/$(ARCH)/Makefile"; \
174 sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
178 $(ARCH_DIR)/include/shared/user_constants.h: $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s
179 $(call filechk,gen-asm-offsets)
181 $(ARCH_DIR)/include/shared/kern_constants.h: $(objtree)/$(ARCH_DIR)/include/shared
183 $(Q)ln -sf ../../../../include/asm/asm-offsets.h $@
185 export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS HEADER_ARCH