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# -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so 50# named - it's a common symbol in libpcap, so we get a binary which crashes. 51# 52# Same things for in6addr_loopback and mktime - found in libc. For these two we 53# only get link-time error, luckily. 54# 55# -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a 56# embedded copy of longjmp, same thing for setjmp. 57# 58# These apply to USER_CFLAGS to. 59 60KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \ 61 $(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap \ 62 -Dlongjmp=kernel_longjmp -Dsetjmp=kernel_setjmp \ 63 -Din6addr_loopback=kernel_in6addr_loopback \ 64 -Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr 65 66KBUILD_RUSTFLAGS += -Crelocation-model=pie 67 68KBUILD_AFLAGS += $(ARCH_INCLUDE) 69 70USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -I%,,$(KBUILD_CFLAGS))) \ 71 $(ARCH_INCLUDE) $(MODE_INCLUDE) $(filter -I%,$(CFLAGS)) \ 72 -D_FILE_OFFSET_BITS=64 -idirafter $(srctree)/include \ 73 -idirafter $(objtree)/include -D__KERNEL__ -D__UM_HOST__ 74 75#This will adjust *FLAGS accordingly to the platform. 76include $(srctree)/$(ARCH_DIR)/Makefile-os-Linux 77 78KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \ 79 -I$(srctree)/$(HOST_DIR)/include/uapi \ 80 -I$(objtree)/$(HOST_DIR)/include/generated \ 81 -I$(objtree)/$(HOST_DIR)/include/generated/uapi 82 83# -Derrno=kernel_errno - This turns all kernel references to errno into 84# kernel_errno to separate them from the libc errno. This allows -fno-common 85# in KBUILD_CFLAGS. Otherwise, it would cause ld to complain about the two different 86# errnos. 87# These apply to kernelspace only. 88# 89# strip leading and trailing whitespace to make the USER_CFLAGS removal of these 90# defines more robust 91 92KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \ 93 -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES)) 94KBUILD_CFLAGS += $(KERNEL_DEFINES) 95 96PHONY += linux 97 98all: linux 99 100linux: vmlinux 101 @echo ' LINK $@' 102 $(Q)ln -f $< $@ 103 104define archhelp 105 echo '* linux - Binary kernel image (./linux) - for backward' 106 echo ' compatibility only, this creates a hard link to the' 107 echo ' real kernel binary, the "vmlinux" binary you' 108 echo ' find in the kernel root.' 109endef 110 111archheaders: 112 $(Q)$(MAKE) -f $(srctree)/Makefile ARCH=$(HEADER_ARCH) asm-generic archheaders 113 114archprepare: 115 $(Q)$(MAKE) $(build)=$(HOST_DIR)/um include/generated/user_constants.h 116 117LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static 118ifdef CONFIG_LD_SCRIPT_DYN 119LINK-$(call gcc-min-version, 60100)$(CONFIG_CC_IS_CLANG) += -no-pie 120endif 121LINK-$(CONFIG_LD_SCRIPT_DYN_RPATH) += -Wl,-rpath,/lib 122 123CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \ 124 -fno-stack-protector $(call cc-option, -fno-stack-protector-all) 125 126# Options used by linker script 127export LDS_START := $(START) 128export LDS_ELF_ARCH := $(ELF_ARCH) 129export LDS_ELF_FORMAT := $(ELF_FORMAT) 130 131# The wrappers will select whether using "malloc" or the kernel allocator. 132LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc 133 134# Avoid binutils 2.39+ warnings by marking the stack non-executable and 135# ignorning warnings for the kallsyms sections. 136LDFLAGS_EXECSTACK = -z noexecstack 137ifeq ($(CONFIG_LD_IS_BFD),y) 138LDFLAGS_EXECSTACK += $(call ld-option,--no-warn-rwx-segments) 139endif 140 141LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS) $(LDFLAGS_EXECSTACK),-Wl,$(opt)) 142 143# Used by link-vmlinux.sh which has special support for um link 144export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE) $(CC_FLAGS_LTO) 145 146# When cleaning we don't include .config, so we don't include 147# TT or skas makefiles and don't clean skas_ptregs.h. 148CLEAN_FILES += linux x.i gmon.out 149MRPROPER_FILES += $(HOST_DIR)/include/generated 150 151archclean: 152 @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \ 153 -o -name '*.gcov' \) -type f -print | xargs rm -f 154 155export HEADER_ARCH SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING DEV_NULL_PATH 156