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 # Have to precede the include because the included Makefiles reference them.
22 SYMLINK_HEADERS := archparam.h system.h sigcontext.h processor.h ptrace.h \
23 module.h vm-flags.h elf.h host_ldt.h
24 SYMLINK_HEADERS := $(foreach header,$(SYMLINK_HEADERS),$(ARCH_DIR)/include/asm/$(header))
26 # XXX: The "os" symlink is only used by arch/um/include/os.h, which includes
27 # ../os/include/file.h
29 # These are cleaned up during mrproper. Please DO NOT fix it again, this is
30 # the Correct Thing(tm) to do!
31 ARCH_SYMLINKS = $(ARCH_DIR)/include/asm/arch $(ARCH_DIR)/include/shared/sysdep $(ARCH_DIR)/os \
32 $(SYMLINK_HEADERS) $(ARCH_DIR)/include/shared/uml-config.h
34 MODE_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include/shared/skas
36 include $(srctree)/$(ARCH_DIR)/Makefile-skas
38 ARCH_INCLUDE := -I$(ARCH_DIR)/include/shared
39 ifneq ($(KBUILD_SRC),)
40 ARCH_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include/shared
41 KBUILD_CPPFLAGS += -I$(ARCH_DIR)/include # for arch symlink
43 SYS_DIR := $(ARCH_DIR)/include/shared/sysdep-$(SUBARCH)
45 # -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
46 # named - it's a common symbol in libpcap, so we get a binary which crashes.
48 # Same things for in6addr_loopback and mktime - found in libc. For these two we
49 # only get link-time error, luckily.
51 # These apply to USER_CFLAGS to.
53 KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ -DSUBARCH=\"$(SUBARCH)\" \
54 $(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap \
55 -Din6addr_loopback=kernel_in6addr_loopback \
56 -Din6addr_any=kernel_in6addr_any
58 KBUILD_AFLAGS += $(ARCH_INCLUDE)
60 USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -D__KERNEL__,,\
61 $(patsubst -I%,,$(KBUILD_CFLAGS)))) $(ARCH_INCLUDE) $(MODE_INCLUDE) \
62 $(filter -I%,$(CFLAGS)) -D_FILE_OFFSET_BITS=64
64 include $(srctree)/$(ARCH_DIR)/Makefile-$(SUBARCH)
66 #This will adjust *FLAGS accordingly to the platform.
67 include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
69 # -Derrno=kernel_errno - This turns all kernel references to errno into
70 # kernel_errno to separate them from the libc errno. This allows -fno-common
71 # in KBUILD_CFLAGS. Otherwise, it would cause ld to complain about the two different
73 # These apply to kernelspace only.
75 # strip leading and trailing whitespace to make the USER_CFLAGS removal of these
78 KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
79 -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
80 KBUILD_CFLAGS += $(KERNEL_DEFINES)
91 echo '* linux - Binary kernel image (./linux) - for backward'
92 echo ' compatibility only, this creates a hard link to the'
93 echo ' real kernel binary, the "vmlinux" binary you'
94 echo ' find in the kernel root.'
97 ifneq ($(KBUILD_SRC),)
98 $(shell mkdir -p $(ARCH_DIR) && ln -fsn $(srctree)/$(ARCH_DIR)/Kconfig.$(SUBARCH) $(ARCH_DIR)/Kconfig.arch)
100 $(shell ln -fsn Kconfig.$(SUBARCH) $(ARCH_DIR)/Kconfig.arch)
103 archprepare: $(ARCH_SYMLINKS) $(ARCH_DIR)/include/shared/user_constants.h
104 prepare: $(ARCH_DIR)/include/shared/kern_constants.h
106 LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
107 LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
109 CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
110 $(call cc-option, -fno-stack-protector,) \
111 $(call cc-option, -fno-stack-protector-all,)
113 CONFIG_KERNEL_STACK_ORDER ?= 2
114 STACK_SIZE := $(shell echo $$[ 4096 * (1 << $(CONFIG_KERNEL_STACK_ORDER)) ] )
116 CPPFLAGS_vmlinux.lds = -U$(SUBARCH) -DSTART=$(START) -DELF_ARCH=$(ELF_ARCH) \
117 -DELF_FORMAT="$(ELF_FORMAT)" -DKERNEL_STACK_SIZE=$(STACK_SIZE)
119 # The wrappers will select whether using "malloc" or the kernel allocator.
120 LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
122 LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))
124 CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
126 $(CC) $(CFLAGS_vmlinux) -o $@ \
127 -Wl,-T,$(vmlinux-lds) $(vmlinux-init) \
128 -Wl,--start-group $(vmlinux-main) -Wl,--end-group \
130 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o \
131 FORCE ,$^) ; rm -f linux
134 # When cleaning we don't include .config, so we don't include
135 # TT or skas makefiles and don't clean skas_ptregs.h.
136 CLEAN_FILES += linux x.i gmon.out $(ARCH_DIR)/include/shared/uml-config.h \
137 $(ARCH_DIR)/include/shared/user_constants.h \
138 $(ARCH_DIR)/include/shared/kern_constants.h $(ARCH_DIR)/Kconfig.arch
140 MRPROPER_FILES += $(ARCH_SYMLINKS)
143 @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
144 -o -name '*.gcov' \) -type f -print | xargs rm -f
148 ifneq ($(KBUILD_SRC),)
149 $(Q)mkdir -p $(objtree)/$(ARCH_DIR)/include/asm
150 $(Q)ln -fsn $(srctree)/$(ARCH_DIR)/include/asm/$(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $@
152 $(Q)ln -sf $(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $@
155 $(ARCH_DIR)/include/asm/arch:
157 ifneq ($(KBUILD_SRC),)
158 $(Q)mkdir -p $(objtree)/$(ARCH_DIR)/include/asm
159 $(Q)ln -fsn $(srctree)/arch/$(HEADER_ARCH)/include/asm $@
161 $(Q)ln -fsn ../../../$(HEADER_ARCH)/include/asm $@
164 $(objtree)/$(ARCH_DIR)/include/shared:
168 $(ARCH_DIR)/include/shared/sysdep: $(objtree)/$(ARCH_DIR)/include/shared
170 ifneq ($(KBUILD_SRC),)
171 $(Q)ln -fsn $(srctree)/$(ARCH_DIR)/include/shared/sysdep-$(SUBARCH) $@
173 $(Q)ln -fsn sysdep-$(SUBARCH) $@
178 ifneq ($(KBUILD_SRC),)
179 $(Q)ln -fsn $(srctree)/$(ARCH_DIR)/os-$(OS) $@
181 $(Q)ln -fsn os-$(OS) $@
185 define filechk_umlconfig
186 sed 's/ CONFIG/ UML_CONFIG/'
189 $(ARCH_DIR)/include/shared/uml-config.h : include/linux/autoconf.h
190 $(call filechk,umlconfig)
192 $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s: FORCE
193 $(Q)$(MAKE) $(build)=$(ARCH_DIR)/sys-$(SUBARCH) $@
195 define filechk_gen-asm-offsets
198 echo " * DO NOT MODIFY."; \
200 echo " * This file was generated by arch/$(ARCH)/Makefile"; \
204 sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
208 $(ARCH_DIR)/include/shared/user_constants.h: $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s
209 $(call filechk,gen-asm-offsets)
211 $(ARCH_DIR)/include/shared/kern_constants.h: $(objtree)/$(ARCH_DIR)/include/shared
213 $(Q)ln -sf ../../../../include/asm/asm-offsets.h $@
215 export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS HEADER_ARCH