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 core-y += $(ARCH_DIR)/kernel/ \
27 $(ARCH_DIR)/drivers/ \
30 MODE_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include/shared/skas
32 HEADER_ARCH := $(SUBARCH)
34 ifneq ($(filter $(SUBARCH),x86 x86_64 i386),)
39 KBUILD_CFLAGS += -mcmodel=large
42 HOST_DIR := arch/$(HEADER_ARCH)
44 include $(srctree)/$(ARCH_DIR)/Makefile-skas
45 include $(srctree)/$(HOST_DIR)/Makefile.um
47 core-y += $(HOST_DIR)/um/
49 SHARED_HEADERS := $(ARCH_DIR)/include/shared
50 ARCH_INCLUDE := -I$(srctree)/$(SHARED_HEADERS)
51 ARCH_INCLUDE += -I$(srctree)/$(HOST_DIR)/um/shared
52 KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um
54 # -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
55 # named - it's a common symbol in libpcap, so we get a binary which crashes.
57 # Same things for in6addr_loopback and mktime - found in libc. For these two we
58 # only get link-time error, luckily.
60 # -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a
61 # embedded copy of longjmp, same thing for setjmp.
63 # These apply to USER_CFLAGS to.
65 KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
66 $(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap \
67 -Dlongjmp=kernel_longjmp -Dsetjmp=kernel_setjmp \
68 -Din6addr_loopback=kernel_in6addr_loopback \
69 -Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
71 KBUILD_RUSTFLAGS += -Crelocation-model=pie
73 KBUILD_AFLAGS += $(ARCH_INCLUDE)
75 USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -I%,,$(KBUILD_CFLAGS))) \
76 $(ARCH_INCLUDE) $(MODE_INCLUDE) $(filter -I%,$(CFLAGS)) \
77 -D_FILE_OFFSET_BITS=64 -idirafter $(srctree)/include \
78 -idirafter $(objtree)/include -D__KERNEL__ -D__UM_HOST__
80 #This will adjust *FLAGS accordingly to the platform.
81 include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
83 KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \
84 -I$(srctree)/$(HOST_DIR)/include/uapi \
85 -I$(objtree)/$(HOST_DIR)/include/generated \
86 -I$(objtree)/$(HOST_DIR)/include/generated/uapi
88 # -Derrno=kernel_errno - This turns all kernel references to errno into
89 # kernel_errno to separate them from the libc errno. This allows -fno-common
90 # in KBUILD_CFLAGS. Otherwise, it would cause ld to complain about the two different
92 # These apply to kernelspace only.
94 # strip leading and trailing whitespace to make the USER_CFLAGS removal of these
97 KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
98 -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
99 KBUILD_CFLAGS += $(KERNEL_DEFINES)
110 echo '* linux - Binary kernel image (./linux) - for backward'
111 echo ' compatibility only, this creates a hard link to the'
112 echo ' real kernel binary, the "vmlinux" binary you'
113 echo ' find in the kernel root.'
117 $(Q)$(MAKE) -f $(srctree)/Makefile ARCH=$(HEADER_ARCH) asm-generic archheaders
120 $(Q)$(MAKE) $(build)=$(HOST_DIR)/um include/generated/user_constants.h
122 LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
123 LINK-$(CONFIG_LD_SCRIPT_DYN) += $(call cc-option, -no-pie)
124 LINK-$(CONFIG_LD_SCRIPT_DYN_RPATH) += -Wl,-rpath,/lib
126 CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
127 -fno-stack-protector $(call cc-option, -fno-stack-protector-all)
129 # Options used by linker script
130 export LDS_START := $(START)
131 export LDS_ELF_ARCH := $(ELF_ARCH)
132 export LDS_ELF_FORMAT := $(ELF_FORMAT)
134 # The wrappers will select whether using "malloc" or the kernel allocator.
135 LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
137 # Avoid binutils 2.39+ warnings by marking the stack non-executable and
138 # ignorning warnings for the kallsyms sections.
139 LDFLAGS_EXECSTACK = -z noexecstack
140 ifeq ($(CONFIG_LD_IS_BFD),y)
141 LDFLAGS_EXECSTACK += $(call ld-option,--no-warn-rwx-segments)
144 LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS) $(LDFLAGS_EXECSTACK),-Wl,$(opt))
146 # Used by link-vmlinux.sh which has special support for um link
147 export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE) $(CC_FLAGS_LTO)
149 # When cleaning we don't include .config, so we don't include
150 # TT or skas makefiles and don't clean skas_ptregs.h.
151 CLEAN_FILES += linux x.i gmon.out
152 MRPROPER_FILES += $(HOST_DIR)/include/generated
155 @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
156 -o -name '*.gcov' \) -type f -print | xargs rm -f
158 export HEADER_ARCH SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS DEV_NULL_PATH