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
9 # select defconfig based on actual architecture
11 ifeq ($(shell uname -m),x86_64)
12 KBUILD_DEFCONFIG := x86_64_defconfig
14 KBUILD_DEFCONFIG := i386_defconfig
17 KBUILD_DEFCONFIG := $(SUBARCH)_defconfig
21 OS := $(shell uname -s)
22 # We require bash because the vmlinux link and loader script cpp use bash
26 filechk_gen_header = $<
28 core-y += $(ARCH_DIR)/kernel/ \
29 $(ARCH_DIR)/drivers/ \
32 MODE_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include/shared/skas
34 HEADER_ARCH := $(SUBARCH)
36 ifneq ($(filter $(SUBARCH),x86 x86_64 i386),)
41 KBUILD_CFLAGS += -mcmodel=large
44 HOST_DIR := arch/$(HEADER_ARCH)
46 include $(ARCH_DIR)/Makefile-skas
47 include $(HOST_DIR)/Makefile.um
49 core-y += $(HOST_DIR)/um/
51 SHARED_HEADERS := $(ARCH_DIR)/include/shared
52 ARCH_INCLUDE := -I$(srctree)/$(SHARED_HEADERS)
53 ARCH_INCLUDE += -I$(srctree)/$(HOST_DIR)/um/shared
54 KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um
56 # -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
57 # named - it's a common symbol in libpcap, so we get a binary which crashes.
59 # Same things for in6addr_loopback and mktime - found in libc. For these two we
60 # only get link-time error, luckily.
62 # These apply to USER_CFLAGS to.
64 KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
65 $(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap \
66 -Din6addr_loopback=kernel_in6addr_loopback \
67 -Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
69 KBUILD_AFLAGS += $(ARCH_INCLUDE)
71 USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -D__KERNEL__,,\
72 $(patsubst -I%,,$(KBUILD_CFLAGS)))) $(ARCH_INCLUDE) $(MODE_INCLUDE) \
73 $(filter -I%,$(CFLAGS)) -D_FILE_OFFSET_BITS=64 -idirafter include
75 #This will adjust *FLAGS accordingly to the platform.
76 include $(ARCH_DIR)/Makefile-os-$(OS)
78 KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \
79 -I$(srctree)/$(HOST_DIR)/include/uapi \
80 -I$(HOST_DIR)/include/generated \
81 -I$(HOST_DIR)/include/generated/uapi
83 # -Derrno=kernel_errno - This turns all kernel references to errno into
84 # kernel_errno to separate them from the libc errno. This allows -fno-common
85 # in KBUILD_CFLAGS. Otherwise, it would cause ld to complain about the two different
87 # These apply to kernelspace only.
89 # strip leading and trailing whitespace to make the USER_CFLAGS removal of these
92 KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
93 -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
94 KBUILD_CFLAGS += $(KERNEL_DEFINES)
105 echo '* linux - Binary kernel image (./linux) - for backward'
106 echo ' compatibility only, this creates a hard link to the'
107 echo ' real kernel binary, the "vmlinux" binary you'
108 echo ' find in the kernel root.'
111 KBUILD_KCONFIG := $(HOST_DIR)/um/Kconfig
114 $(Q)$(MAKE) KBUILD_SRC= ARCH=$(HEADER_ARCH) archheaders
116 archprepare: include/generated/user_constants.h
118 LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
119 LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
121 CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
122 $(call cc-option, -fno-stack-protector,) \
123 $(call cc-option, -fno-stack-protector-all,)
125 # Options used by linker script
126 export LDS_START := $(START)
127 export LDS_ELF_ARCH := $(ELF_ARCH)
128 export LDS_ELF_FORMAT := $(ELF_FORMAT)
130 # The wrappers will select whether using "malloc" or the kernel allocator.
131 LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
133 LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))
135 # Used by link-vmlinux.sh which has special support for um link
136 export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
138 # When cleaning we don't include .config, so we don't include
139 # TT or skas makefiles and don't clean skas_ptregs.h.
140 CLEAN_FILES += linux x.i gmon.out
143 @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
144 -o -name '*.gcov' \) -type f -print | xargs rm -f
148 $(HOST_DIR)/um/user-offsets.s: __headers FORCE
149 $(Q)$(MAKE) $(build)=$(HOST_DIR)/um $@
151 define filechk_gen-asm-offsets
154 echo " * DO NOT MODIFY."; \
156 echo " * This file was generated by arch/$(ARCH)/Makefile"; \
160 sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
164 include/generated/user_constants.h: $(HOST_DIR)/um/user-offsets.s
165 $(call filechk,gen-asm-offsets)
167 export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS DEV_NULL_PATH