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 21OS := $(shell uname -s) 22# We require bash because the vmlinux link and loader script cpp use bash 23# features. 24SHELL := /bin/bash 25 26core-y += $(ARCH_DIR)/kernel/ \ 27 $(ARCH_DIR)/drivers/ \ 28 $(ARCH_DIR)/os-$(OS)/ 29 30MODE_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include/shared/skas 31 32HEADER_ARCH := $(SUBARCH) 33 34ifneq ($(filter $(SUBARCH),x86 x86_64 i386),) 35 HEADER_ARCH := x86 36endif 37 38ifdef CONFIG_64BIT 39 KBUILD_CFLAGS += -mcmodel=large 40endif 41 42HOST_DIR := arch/$(HEADER_ARCH) 43 44include $(srctree)/$(ARCH_DIR)/Makefile-skas 45include $(srctree)/$(HOST_DIR)/Makefile.um 46 47core-y += $(HOST_DIR)/um/ 48 49SHARED_HEADERS := $(ARCH_DIR)/include/shared 50ARCH_INCLUDE := -I$(srctree)/$(SHARED_HEADERS) 51ARCH_INCLUDE += -I$(srctree)/$(HOST_DIR)/um/shared 52KBUILD_CPPFLAGS += -I$(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 65KBUILD_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 71KBUILD_RUSTFLAGS += -Crelocation-model=pie 72 73KBUILD_AFLAGS += $(ARCH_INCLUDE) 74 75USER_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__ 79 80#This will adjust *FLAGS accordingly to the platform. 81include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS) 82 83KBUILD_CPPFLAGS += -I$(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 87 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 91# errnos. 92# These apply to kernelspace only. 93# 94# strip leading and trailing whitespace to make the USER_CFLAGS removal of these 95# defines more robust 96 97KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \ 98 -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES)) 99KBUILD_CFLAGS += $(KERNEL_DEFINES) 100 101PHONY += linux 102 103all: linux 104 105linux: vmlinux 106 @echo ' LINK $@' 107 $(Q)ln -f $< $@ 108 109define archhelp 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.' 114endef 115 116archheaders: 117 $(Q)$(MAKE) -f $(srctree)/Makefile ARCH=$(HEADER_ARCH) asm-generic archheaders 118 119archprepare: 120 $(Q)$(MAKE) $(build)=$(HOST_DIR)/um include/generated/user_constants.h 121 122LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static 123LINK-$(CONFIG_LD_SCRIPT_DYN) += $(call cc-option, -no-pie) 124LINK-$(CONFIG_LD_SCRIPT_DYN_RPATH) += -Wl,-rpath,/lib 125 126CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \ 127 -fno-stack-protector $(call cc-option, -fno-stack-protector-all) 128 129# Options used by linker script 130export LDS_START := $(START) 131export LDS_ELF_ARCH := $(ELF_ARCH) 132export LDS_ELF_FORMAT := $(ELF_FORMAT) 133 134# The wrappers will select whether using "malloc" or the kernel allocator. 135LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc 136 137# Avoid binutils 2.39+ warnings by marking the stack non-executable and 138# ignorning warnings for the kallsyms sections. 139LDFLAGS_EXECSTACK = -z noexecstack 140ifeq ($(CONFIG_LD_IS_BFD),y) 141LDFLAGS_EXECSTACK += $(call ld-option,--no-warn-rwx-segments) 142endif 143 144LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS) $(LDFLAGS_EXECSTACK),-Wl,$(opt)) 145 146# Used by link-vmlinux.sh which has special support for um link 147export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE) $(CC_FLAGS_LTO) 148 149# When cleaning we don't include .config, so we don't include 150# TT or skas makefiles and don't clean skas_ptregs.h. 151CLEAN_FILES += linux x.i gmon.out 152MRPROPER_FILES += arch/$(SUBARCH)/include/generated 153 154archclean: 155 @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \ 156 -o -name '*.gcov' \) -type f -print | xargs rm -f 157 158export HEADER_ARCH SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS DEV_NULL_PATH 159