1 # 2 # This file is included by the global makefile so that you can add your own 3 # architecture-specific flags and dependencies. 4 # 5 # Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 6 # Licensed under the GPL 7 # 8 9 # select defconfig based on actual architecture 10 ifeq ($(SUBARCH),x86) 11 ifeq ($(shell uname -m),x86_64) 12 KBUILD_DEFCONFIG := x86_64_defconfig 13 else 14 KBUILD_DEFCONFIG := i386_defconfig 15 endif 16 else 17 KBUILD_DEFCONFIG := $(SUBARCH)_defconfig 18 endif 19 20 ARCH_DIR := arch/um 21 OS := $(shell uname -s) 22 # We require bash because the vmlinux link and loader script cpp use bash 23 # features. 24 SHELL := /bin/bash 25 26 core-y += $(ARCH_DIR)/kernel/ \ 27 $(ARCH_DIR)/drivers/ \ 28 $(ARCH_DIR)/os-$(OS)/ 29 30 MODE_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include/shared/skas 31 32 HEADER_ARCH := $(SUBARCH) 33 34 ifneq ($(filter $(SUBARCH),x86 x86_64 i386),) 35 HEADER_ARCH := x86 36 endif 37 38 ifdef CONFIG_64BIT 39 KBUILD_CFLAGS += -mcmodel=large 40 endif 41 42 HOST_DIR := arch/$(HEADER_ARCH) 43 44 include $(srctree)/$(ARCH_DIR)/Makefile-skas 45 include $(srctree)/$(HOST_DIR)/Makefile.um 46 47 core-y += $(HOST_DIR)/um/ 48 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 53 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. 56 # 57 # Same things for in6addr_loopback and mktime - found in libc. For these two we 58 # only get link-time error, luckily. 59 # 60 # -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a 61 # embedded copy of longjmp, same thing for setjmp. 62 # 63 # These apply to USER_CFLAGS to. 64 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 70 71 KBUILD_AFLAGS += $(ARCH_INCLUDE) 72 73 USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -I%,,$(KBUILD_CFLAGS))) \ 74 $(ARCH_INCLUDE) $(MODE_INCLUDE) $(filter -I%,$(CFLAGS)) \ 75 -D_FILE_OFFSET_BITS=64 -idirafter $(srctree)/include \ 76 -idirafter $(objtree)/include -D__KERNEL__ -D__UM_HOST__ 77 78 #This will adjust *FLAGS accordingly to the platform. 79 include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS) 80 81 KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \ 82 -I$(srctree)/$(HOST_DIR)/include/uapi \ 83 -I$(objtree)/$(HOST_DIR)/include/generated \ 84 -I$(objtree)/$(HOST_DIR)/include/generated/uapi 85 86 # -Derrno=kernel_errno - This turns all kernel references to errno into 87 # kernel_errno to separate them from the libc errno. This allows -fno-common 88 # in KBUILD_CFLAGS. Otherwise, it would cause ld to complain about the two different 89 # errnos. 90 # These apply to kernelspace only. 91 # 92 # strip leading and trailing whitespace to make the USER_CFLAGS removal of these 93 # defines more robust 94 95 KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \ 96 -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES)) 97 KBUILD_CFLAGS += $(KERNEL_DEFINES) 98 99 PHONY += linux 100 101 all: linux 102 103 linux: vmlinux 104 @echo ' LINK $@' 105 $(Q)ln -f $< $@ 106 107 define archhelp 108 echo '* linux - Binary kernel image (./linux) - for backward' 109 echo ' compatibility only, this creates a hard link to the' 110 echo ' real kernel binary, the "vmlinux" binary you' 111 echo ' find in the kernel root.' 112 endef 113 114 archheaders: 115 $(Q)$(MAKE) -f $(srctree)/Makefile ARCH=$(HEADER_ARCH) asm-generic archheaders 116 117 archprepare: 118 $(Q)$(MAKE) $(build)=$(HOST_DIR)/um include/generated/user_constants.h 119 120 LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static 121 LINK-$(CONFIG_LD_SCRIPT_DYN) += $(call cc-option, -no-pie) 122 LINK-$(CONFIG_LD_SCRIPT_DYN_RPATH) += -Wl,-rpath,/lib 123 124 CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \ 125 -fno-stack-protector $(call cc-option, -fno-stack-protector-all) 126 127 # Options used by linker script 128 export LDS_START := $(START) 129 export LDS_ELF_ARCH := $(ELF_ARCH) 130 export LDS_ELF_FORMAT := $(ELF_FORMAT) 131 132 # The wrappers will select whether using "malloc" or the kernel allocator. 133 LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc 134 135 # Avoid binutils 2.39+ warnings by marking the stack non-executable and 136 # ignorning warnings for the kallsyms sections. 137 LDFLAGS_EXECSTACK = -z noexecstack 138 ifeq ($(CONFIG_LD_IS_BFD),y) 139 LDFLAGS_EXECSTACK += $(call ld-option,--no-warn-rwx-segments) 140 endif 141 142 LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS),-Wl,$(opt)) 143 144 # Used by link-vmlinux.sh which has special support for um link 145 export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE) 146 export LDFLAGS_vmlinux := $(LDFLAGS_EXECSTACK) 147 148 # When cleaning we don't include .config, so we don't include 149 # TT or skas makefiles and don't clean skas_ptregs.h. 150 CLEAN_FILES += linux x.i gmon.out 151 MRPROPER_FILES += arch/$(SUBARCH)/include/generated 152 153 archclean: 154 @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \ 155 -o -name '*.gcov' \) -type f -print | xargs rm -f 156 157 export HEADER_ARCH SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS DEV_NULL_PATH 158