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 := /bin/bash 24 25core-y += $(ARCH_DIR)/kernel/ \ 26 $(ARCH_DIR)/drivers/ \ 27 $(ARCH_DIR)/os-Linux/ 28 29MODE_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include/shared/skas 30 31HEADER_ARCH := $(SUBARCH) 32 33ifneq ($(filter $(SUBARCH),x86 x86_64 i386),) 34 HEADER_ARCH := x86 35endif 36 37ifdef CONFIG_64BIT 38 KBUILD_CFLAGS += -mcmodel=large 39endif 40 41HOST_DIR := arch/$(HEADER_ARCH) 42 43include $(srctree)/$(ARCH_DIR)/Makefile-skas 44include $(srctree)/$(HOST_DIR)/Makefile.um 45 46core-y += $(HOST_DIR)/um/ 47 48SHARED_HEADERS := $(ARCH_DIR)/include/shared 49ARCH_INCLUDE := -I$(srctree)/$(SHARED_HEADERS) 50ARCH_INCLUDE += -I$(srctree)/$(HOST_DIR)/um/shared 51KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um 52 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. 55# 56# Same things for in6addr_loopback and mktime - found in libc. For these two we 57# only get link-time error, luckily. 58# 59# -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a 60# embedded copy of longjmp, same thing for setjmp. 61# 62# These apply to USER_CFLAGS to. 63 64KBUILD_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 69 70KBUILD_RUSTFLAGS += -Crelocation-model=pie 71 72KBUILD_AFLAGS += $(ARCH_INCLUDE) 73 74USER_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__ 78 79#This will adjust *FLAGS accordingly to the platform. 80include $(srctree)/$(ARCH_DIR)/Makefile-os-Linux 81 82KBUILD_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 86 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 90# errnos. 91# These apply to kernelspace only. 92# 93# strip leading and trailing whitespace to make the USER_CFLAGS removal of these 94# defines more robust 95 96KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \ 97 -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES)) 98KBUILD_CFLAGS += $(KERNEL_DEFINES) 99 100PHONY += linux 101 102all: linux 103 104linux: vmlinux 105 @echo ' LINK $@' 106 $(Q)ln -f $< $@ 107 108define archhelp 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.' 113endef 114 115archheaders: 116 $(Q)$(MAKE) -f $(srctree)/Makefile ARCH=$(HEADER_ARCH) asm-generic archheaders 117 118archprepare: 119 $(Q)$(MAKE) $(build)=$(HOST_DIR)/um include/generated/user_constants.h 120 121LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static 122LINK-$(CONFIG_LD_SCRIPT_DYN) += $(call cc-option, -no-pie) 123LINK-$(CONFIG_LD_SCRIPT_DYN_RPATH) += -Wl,-rpath,/lib 124 125CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \ 126 -fno-stack-protector $(call cc-option, -fno-stack-protector-all) 127 128# Options used by linker script 129export LDS_START := $(START) 130export LDS_ELF_ARCH := $(ELF_ARCH) 131export LDS_ELF_FORMAT := $(ELF_FORMAT) 132 133# The wrappers will select whether using "malloc" or the kernel allocator. 134LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc 135 136# Avoid binutils 2.39+ warnings by marking the stack non-executable and 137# ignorning warnings for the kallsyms sections. 138LDFLAGS_EXECSTACK = -z noexecstack 139ifeq ($(CONFIG_LD_IS_BFD),y) 140LDFLAGS_EXECSTACK += $(call ld-option,--no-warn-rwx-segments) 141endif 142 143LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS) $(LDFLAGS_EXECSTACK),-Wl,$(opt)) 144 145# Used by link-vmlinux.sh which has special support for um link 146export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE) $(CC_FLAGS_LTO) 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. 150CLEAN_FILES += linux x.i gmon.out 151MRPROPER_FILES += $(HOST_DIR)/include/generated 152 153archclean: 154 @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \ 155 -o -name '*.gcov' \) -type f -print | xargs rm -f 156 157export HEADER_ARCH SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING DEV_NULL_PATH 158