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 # We require bash because the vmlinux link and loader script cpp use bash
25 core-y += $(ARCH_DIR)/kernel/ \
26 $(ARCH_DIR)/drivers/ \
29 MODE_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include/shared/skas
31 HEADER_ARCH := $(SUBARCH)
33 ifneq ($(filter $(SUBARCH),x86 x86_64 i386),)
38 KBUILD_CFLAGS += -mcmodel=large
41 HOST_DIR := arch/$(HEADER_ARCH)
43 include $(srctree)/$(ARCH_DIR)/Makefile-skas
44 include $(srctree)/$(HOST_DIR)/Makefile.um
46 core-y += $(HOST_DIR)/um/
48 SHARED_HEADERS := $(ARCH_DIR)/include/shared
49 ARCH_INCLUDE := -I$(srctree)/$(SHARED_HEADERS)
50 ARCH_INCLUDE += -I$(srctree)/$(HOST_DIR)/um/shared
51 KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um
53 # -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
54 # named - it's a common symbol in libpcap, so we get a binary which crashes.
56 # Same things for in6addr_loopback and mktime - found in libc. For these two we
57 # only get link-time error, luckily.
59 # -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a
60 # embedded copy of longjmp, same thing for setjmp.
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 -Dlongjmp=kernel_longjmp -Dsetjmp=kernel_setjmp \
67 -Din6addr_loopback=kernel_in6addr_loopback \
68 -Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
70 KBUILD_RUSTFLAGS += -Crelocation-model=pie
72 KBUILD_AFLAGS += $(ARCH_INCLUDE)
74 USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -I%,,$(KBUILD_CFLAGS))) \
75 $(ARCH_INCLUDE) $(MODE_INCLUDE) $(filter -I%,$(CFLAGS)) \
76 -D_FILE_OFFSET_BITS=64 -idirafter $(srctree)/include \
77 -idirafter $(objtree)/include -D__KERNEL__ -D__UM_HOST__
79 #This will adjust *FLAGS accordingly to the platform.
80 include $(srctree)/$(ARCH_DIR)/Makefile-os-Linux
82 KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \
83 -I$(srctree)/$(HOST_DIR)/include/uapi \
84 -I$(objtree)/$(HOST_DIR)/include/generated \
85 -I$(objtree)/$(HOST_DIR)/include/generated/uapi
87 # -Derrno=kernel_errno - This turns all kernel references to errno into
88 # kernel_errno to separate them from the libc errno. This allows -fno-common
89 # in KBUILD_CFLAGS. Otherwise, it would cause ld to complain about the two different
91 # These apply to kernelspace only.
93 # strip leading and trailing whitespace to make the USER_CFLAGS removal of these
96 KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
97 -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
98 KBUILD_CFLAGS += $(KERNEL_DEFINES)
109 echo '* linux - Binary kernel image (./linux) - for backward'
110 echo ' compatibility only, this creates a hard link to the'
111 echo ' real kernel binary, the "vmlinux" binary you'
112 echo ' find in the kernel root.'
116 $(Q)$(MAKE) -f $(srctree)/Makefile ARCH=$(HEADER_ARCH) asm-generic archheaders
119 $(Q)$(MAKE) $(build)=$(HOST_DIR)/um include/generated/user_constants.h
121 LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
122 LINK-$(CONFIG_LD_SCRIPT_DYN) += $(call cc-option, -no-pie)
123 LINK-$(CONFIG_LD_SCRIPT_DYN_RPATH) += -Wl,-rpath,/lib
125 CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
126 -fno-stack-protector $(call cc-option, -fno-stack-protector-all)
128 # Options used by linker script
129 export LDS_START := $(START)
130 export LDS_ELF_ARCH := $(ELF_ARCH)
131 export LDS_ELF_FORMAT := $(ELF_FORMAT)
133 # The wrappers will select whether using "malloc" or the kernel allocator.
134 LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
136 # Avoid binutils 2.39+ warnings by marking the stack non-executable and
137 # ignorning warnings for the kallsyms sections.
138 LDFLAGS_EXECSTACK = -z noexecstack
139 ifeq ($(CONFIG_LD_IS_BFD),y)
140 LDFLAGS_EXECSTACK += $(call ld-option,--no-warn-rwx-segments)
143 LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS) $(LDFLAGS_EXECSTACK),-Wl,$(opt))
145 # Used by link-vmlinux.sh which has special support for um link
146 export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE) $(CC_FLAGS_LTO)
148 # When cleaning we don't include .config, so we don't include
149 # TT or skas makefiles and don't clean skas_ptregs.h.
150 CLEAN_FILES += linux x.i gmon.out
151 MRPROPER_FILES += $(HOST_DIR)/include/generated
154 @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
155 -o -name '*.gcov' \) -type f -print | xargs rm -f
157 export HEADER_ARCH SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING DEV_NULL_PATH