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 10ifeq ($(SUBARCH),x86) 11 ifeq ($(shell uname -m),x86_64) 12 KBUILD_DEFCONFIG := x86_64_defconfig 13 else 14 KBUILD_DEFCONFIG := i386_defconfig 15 endif 16else 17 KBUILD_DEFCONFIG := $(SUBARCH)_defconfig 18endif 19 20ARCH_DIR := arch/um 21# We require bash because the vmlinux link and loader script cpp use bash 22# features. 23SHELL := bash 24 25MODE_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include/shared/skas 26 27HEADER_ARCH := $(SUBARCH) 28 29ifneq ($(filter $(SUBARCH),x86 x86_64 i386),) 30 HEADER_ARCH := x86 31endif 32 33ifdef CONFIG_64BIT 34 KBUILD_CFLAGS += -mcmodel=large 35endif 36 37HOST_DIR := arch/$(HEADER_ARCH) 38 39include $(srctree)/$(ARCH_DIR)/Makefile-skas 40include $(srctree)/$(HOST_DIR)/Makefile.um 41 42core-y += $(HOST_DIR)/um/ 43 44SHARED_HEADERS := $(ARCH_DIR)/include/shared 45ARCH_INCLUDE := -I$(srctree)/$(SHARED_HEADERS) 46ARCH_INCLUDE += -I$(srctree)/$(HOST_DIR)/um/shared 47KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um 48 49# -Dstrrchr=kernel_strrchr (as well as the various in6addr symbols) prevents 50# anything from referencing 51# libc symbols with the same name, which can cause a linker error. 52# 53# -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a 54# embedded copy of longjmp, same thing for setjmp. 55# 56# These apply to USER_CFLAGS too. 57 58KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \ 59 $(ARCH_INCLUDE) $(MODE_INCLUDE) \ 60 -Dlongjmp=kernel_longjmp -Dsetjmp=kernel_setjmp \ 61 -Din6addr_loopback=kernel_in6addr_loopback \ 62 -Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr \ 63 -D__close_range=kernel__close_range 64 65KBUILD_RUSTFLAGS += -Crelocation-model=pie 66 67KBUILD_AFLAGS += $(ARCH_INCLUDE) 68 69USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -I%,,$(KBUILD_CFLAGS))) \ 70 $(ARCH_INCLUDE) $(MODE_INCLUDE) $(filter -I%,$(CFLAGS)) \ 71 -D_FILE_OFFSET_BITS=64 -idirafter $(srctree)/include \ 72 -idirafter $(objtree)/include -D__KERNEL__ -D__UM_HOST__ \ 73 -include $(srctree)/include/linux/compiler-version.h \ 74 -include $(srctree)/include/linux/kconfig.h 75 76#This will adjust *FLAGS accordingly to the platform. 77include $(srctree)/$(ARCH_DIR)/Makefile-os-Linux 78 79KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \ 80 -I$(srctree)/$(HOST_DIR)/include/uapi \ 81 -I$(objtree)/$(HOST_DIR)/include/generated \ 82 -I$(objtree)/$(HOST_DIR)/include/generated/uapi 83 84# -Derrno=kernel_errno - This turns all kernel references to errno into 85# kernel_errno to separate them from the libc errno. This allows -fno-common 86# in KBUILD_CFLAGS. Otherwise, it would cause ld to complain about the two different 87# errnos. 88# These apply to kernelspace only. 89# 90# strip leading and trailing whitespace to make the USER_CFLAGS removal of these 91# defines more robust 92 93KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \ 94 -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES)) 95KBUILD_CFLAGS += $(KERNEL_DEFINES) 96 97PHONY += linux 98 99all: linux 100 101linux: vmlinux 102 @echo ' LINK $@' 103 $(Q)ln -f $< $@ 104 105define archhelp 106 echo '* linux - Binary kernel image (./linux) - for backward' 107 echo ' compatibility only, this creates a hard link to the' 108 echo ' real kernel binary, the "vmlinux" binary you' 109 echo ' find in the kernel root.' 110endef 111 112archheaders: 113 $(Q)$(MAKE) -f $(srctree)/Makefile ARCH=$(HEADER_ARCH) asm-generic archheaders 114 115archprepare: 116 $(Q)$(MAKE) $(build)=$(HOST_DIR)/um include/generated/user_constants.h 117 118LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static 119LINK-$(CONFIG_LD_SCRIPT_DYN) += -no-pie 120LINK-$(CONFIG_LD_SCRIPT_DYN_RPATH) += -Wl,-rpath,/lib 121 122CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \ 123 -fno-stack-protector $(call cc-option, -fno-stack-protector-all) 124 125# Options used by linker script 126export LDS_START := $(START) 127export LDS_ELF_ARCH := $(ELF_ARCH) 128export LDS_ELF_FORMAT := $(ELF_FORMAT) 129 130# The wrappers will select whether using "malloc" or the kernel allocator. 131LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc 132 133# Avoid binutils 2.39+ warnings by marking the stack non-executable and 134# ignorning warnings for the kallsyms sections. 135LDFLAGS_EXECSTACK = -z noexecstack 136ifeq ($(CONFIG_LD_IS_BFD),y) 137LDFLAGS_EXECSTACK += $(call ld-option,--no-warn-rwx-segments) 138endif 139 140LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS) $(LDFLAGS_EXECSTACK),-Wl,$(opt)) 141 142# Used by link-vmlinux.sh which has special support for um link 143export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE) $(CC_FLAGS_LTO) 144 145# When cleaning we don't include .config, so we don't include 146# TT or skas makefiles and don't clean skas_ptregs.h. 147CLEAN_FILES += linux x.i gmon.out 148MRPROPER_FILES += $(HOST_DIR)/include/generated 149 150archclean: 151 @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \ 152 -o -name '*.gcov' \) -type f -print | xargs rm -f 153 $(Q)$(MAKE) -f $(srctree)/Makefile ARCH=$(HEADER_ARCH) clean 154 155export HEADER_ARCH SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING DEV_NULL_PATH 156